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Branco RHR, Meulepas RJW, Kadlecová K, Cardoso MFS, Rijnaarts HHM, Sutton NB. Effect of dissolved organic carbon on micropollutant biodegradation by aquifer and soil microbial communities. CHEMOSPHERE 2024; 347:140644. [PMID: 37952821 DOI: 10.1016/j.chemosphere.2023.140644] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 09/11/2023] [Accepted: 11/06/2023] [Indexed: 11/14/2023]
Abstract
Groundwater, a major source of drinking water worldwide, is often contaminated with micropollutants. Although microbial communities in aquifers and soils have the capability to biodegrade some micropollutants, this process is limited in situ. Biostimulation with dissolved organic carbon (DOC) is known to promote micropollutant biodegradation, but the role of DOC biodegradability is still poorly understood. This study investigated how three DOC types with different biodegradability (humics, dextran and acetate) affect the biodegradation of 15 micropollutants by aquifer and soil microbial communities under aerobic and nitrate reducing conditions. Although originating from different environments, both communities were able to biodegrade the same 4 micropollutants under aerobic conditions - 2,4-D, MCPP, chloridazon (CLZ) and chloridazon-desphenyl. However, DOC addition only affected MCPP biodegradation, promoting MCPP biodegradation regardless of DOC biodegradability. Biodegradation of 2,4-D, MCPP and CLZ under aerobic conditions was observed after a lag phase, whose duration differed per compound. 2,4-D was biodegraded first and fully. Aquifer community was able to degrade about half of the initial MCPP concentration (removal efficiency of 49.3 ± 11.7%). CLZ was fully biodegraded by the aquifer community, but not by the soil community, possibly due to substrate competition with organics originating from the inoculum. Therefore, the natural organic carbon present in the inocula and in environmental systems can influence micropollutant biodegradation. Under nitrate reducing conditions micropollutant biodegradation was not observed nor biostimulated by DOC addition. The results also highlight the importance of sufficient exposure time to trigger in situ micropollutant biodegradation.
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Affiliation(s)
- Rita H R Branco
- Environmental Technology, Wageningen University & Research, P.O. Box 47, 6700 AA, Wageningen, the Netherlands; Wetsus, European Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900 CC, Leeuwarden, the Netherlands
| | - Roel J W Meulepas
- Wetsus, European Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900 CC, Leeuwarden, the Netherlands
| | - Kateřina Kadlecová
- Environmental Technology, Wageningen University & Research, P.O. Box 47, 6700 AA, Wageningen, the Netherlands; Wetsus, European Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900 CC, Leeuwarden, the Netherlands
| | - Marta F S Cardoso
- Wetsus, European Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900 CC, Leeuwarden, the Netherlands
| | - Huub H M Rijnaarts
- Environmental Technology, Wageningen University & Research, P.O. Box 47, 6700 AA, Wageningen, the Netherlands
| | - Nora B Sutton
- Environmental Technology, Wageningen University & Research, P.O. Box 47, 6700 AA, Wageningen, the Netherlands.
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Kruisdijk E, Zietzschmann F, Stuyfzand PJ, van Breukelen BM. Intra aquifer variations in pesticide sorption during a field injection experiment. JOURNAL OF CONTAMINANT HYDROLOGY 2022; 248:104015. [PMID: 35489141 DOI: 10.1016/j.jconhyd.2022.104015] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 04/20/2022] [Accepted: 04/21/2022] [Indexed: 06/14/2023]
Abstract
A field injection experiment was performed in an anoxic sandy aquifer over 6 days to assess sorption characteristics of 7 commonly applied pesticides in agriculture and 2 frequently detected metabolites. Pesticide use changed considerably in the last decades, and there is insufficient knowledge of the fate of currently used pesticides in aquifers. Injected water arrival was monitored at 6 depth intervals of 1 m ranging from 11.4 to 32.2 m-below surface level with varying organic carbon contents (0.057-0.91%d.w.) to examine intra-aquifer variations in sorption. Observed pesticide concentrations were fit using a non-linear least squares routine to an advection-dispersion equation, from which retardation factors (R) were obtained. Pesticide degradation did not significantly influence the simulated R during the experiment. We observed that bentazon and cycloxydim were most mobile with R < 1.1 at all depths. Desphenyl chloridazon, methyl desphenyl chloridazon, and imidacloprid were, on average, less mobile, with maximum R of 1.5. Boscalid, chloridazon, fluopyram, and flutolanil showed a larger range of R, and R > 2.0 were observed in the shallowest part of the aquifer. Largest R were observed at the top of the aquifer and decreased with depth. Koc values varied similarly, which indicates that sorption is not only influenced by sedimentary organic matter (SOM) content but also by its sorption reactivity. Obtained sorption parameters were substantially lower than reported in a widely used pesticide sorption database, which suggests that sorption parameters are influenced by methodological differences and variations in the sorption reactivity of SOM. The large intra-aquifer variations in pesticide sorption highlights that aquifer heterogeneity should be considered in groundwater risk assessments.
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Affiliation(s)
- Emiel Kruisdijk
- Delft University of Technology, Faculty of Civil Engineering and Geosciences, Department of Water Management, Stevinweg 1, 2628 CN Delft, the Netherlands; Acacia Water B.V., Van Hogendorpplein 4, 2805 BM Gouda, the Netherlands.
| | - Frederik Zietzschmann
- Delft University of Technology, Faculty of Civil Engineering and Geosciences, Department of Water Management, Stevinweg 1, 2628 CN Delft, the Netherlands; Berliner Wasserbetriebe, Motardstr. 35, 13629 Berlin, Germany
| | - Pieter J Stuyfzand
- Delft University of Technology, Faculty of Civil Engineering and Geosciences, Department of Water Management, Stevinweg 1, 2628 CN Delft, the Netherlands; Stuyfzand Hydroconsult+, 2042 BL Zandvoort, the Netherlands
| | - Boris M van Breukelen
- Delft University of Technology, Faculty of Civil Engineering and Geosciences, Department of Water Management, Stevinweg 1, 2628 CN Delft, the Netherlands
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3
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Parvulescu VI, Epron F, Garcia H, Granger P. Recent Progress and Prospects in Catalytic Water Treatment. Chem Rev 2021; 122:2981-3121. [PMID: 34874709 DOI: 10.1021/acs.chemrev.1c00527] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Presently, conventional technologies in water treatment are not efficient enough to completely mineralize refractory water contaminants. In this context, the implementation of catalytic processes could be an alternative. Despite the advantages provided in terms of kinetics of transformation, selectivity, and energy saving, numerous attempts have not yet led to implementation at an industrial scale. This review examines investigations at different scales for which controversies and limitations must be solved to bridge the gap between fundamentals and practical developments. Particular attention has been paid to the development of solar-driven catalytic technologies and some other emerging processes, such as microwave assisted catalysis, plasma-catalytic processes, or biocatalytic remediation, taking into account their specific advantages and the drawbacks. Challenges for which a better understanding related to the complexity of the systems and the coexistence of various solid-liquid-gas interfaces have been identified.
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Affiliation(s)
- Vasile I Parvulescu
- Department of Organic Chemistry, Biochemistry and Catalysis, University of Bucharest, B-dul Regina Elisabeta 4-12, Bucharest 030016, Romania
| | - Florence Epron
- Université de Poitiers, CNRS UMR 7285, Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), 4 rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Hermenegildo Garcia
- Instituto Universitario de Tecnología Química, Universitat Politecnica de Valencia-Consejo Superior de Investigaciones Científicas, Universitat Politencia de Valencia, Av. de los Naranjos s/n, 46022 Valencia, Spain
| | - Pascal Granger
- CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, Univ. Lille, F-59000 Lille, France
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4
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Yu W, Jiang H, Fang J, Song S. Designing an Electron-Deficient Pd/NiCo 2O 4 Bifunctional Electrocatalyst with an Enhanced Hydrodechlorination Activity to Reduce the Consumption of Pd. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:10087-10096. [PMID: 34196544 DOI: 10.1021/acs.est.1c01922] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Reducing the Pd loading on electrodes is critical in the electrocatalytic hydrodechlorination (EHDC) of chlorinated organic compounds (COCs). The EHDC reaction of COCs on Pd involves three steps: H* formation, H* adsorption, and dechlorination. It has been established that the initial hydrogen evolution reaction (HER) occurs on Pd0 and the dechlorination steps occur on Pd2+. A strategy is proposed to design new electrodes by adding a reducible HER-active interlayer to replace Pd0, fulfilling the responsibility of producing hydrogen, and to facilitate the formation of more Pd2+ for following C-Cl bond cleavage. Keeping the atomic hydrogen adsorption energy on the Pd/interlayer similar to that on pure Pd is also necessary for H* adsorption as well as to maintain a high EHDC activity. For the first time, the NiCo2O4-interlayer-modified Pd/Ni-foam electrode was applied in the EHDC of COCs, which enhanced the EHDC efficiency to 100% within 90 min and reduced 88.6% of Pd consumption. The Pd/NiCo2O4/Ni-foam electrode with enhanced EHDC activity was also observed with almost 100% product selectivity and good stability. A synergistic mechanism is proposed for the enhanced EHDC activity on the Pd/NiCo2O4/Ni-foam. This work offers a simple and useful strategy to design robust electrocatalysts for the EHDC of COCs.
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Affiliation(s)
- Weiting Yu
- College of Environment, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China
| | - He Jiang
- College of Environment, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China
| | - Jinhui Fang
- College of Environment, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China
| | - Shuang Song
- College of Environment, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China
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Santos JEL, de Moura DC, Cerro-López M, Quiroz MA, Martínez-Huitle CA. Electro- and photo-electrooxidation of 2,4,5-trichlorophenoxiacetic acid (2,4,5-T) in aqueous media with PbO2, Sb-doped SnO2, BDD and TiO2-NTs anodes: A comparative study. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114438] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Muszyński P, Brodowska MS, Paszko T. Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:1276-1293. [PMID: 31788729 PMCID: PMC6994553 DOI: 10.1007/s11356-019-06510-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 09/10/2019] [Indexed: 05/07/2023]
Abstract
The article presents the behavior of phenoxy acids in water, the levels in aquatic ecosystems, and their transformations in the water environment. Phenoxy acids are highly soluble in water and weakly absorbed in soil. These highly mobile compounds are readily transported to surface and groundwater. Monitoring studies conducted in Europe and in other parts of the world indicate that the predominant phenoxy acids in the aquatic environment are mecoprop, 4-chloro-2-methylphenoxyacetic acid (MCPA), dichlorprop, 2,4-dichlorophenoxyacetic acid (2,4-D), and their metabolites which are chlorophenol derivatives. In water, the concentrations of phenoxy acids are effectively lowered by hydrolysis, biodegradation, and photodegradation, and a key role is played by microbial decomposition. This process is determined by the qualitative and quantitative composition of microorganisms, oxygen levels in water, and the properties and concentrations of phenoxy acids. In shallow and highly insolated waters, phenoxy acids can be decomposed mainly by photodegradation whose efficiency is determined by the form of the degraded compound. Numerous studies are underway on the use of advanced oxidation processes (AOPs) to remove phenoxy acids. The efficiency of phenoxy acid degradation using AOPs varies depending on the choice of oxidizing system and the conditions optimizing the oxidation process. Most often, methods combining UV radiation with other reagents are used to oxidize phenoxy acids. It has been found that this solution is more effective compared with the oxidation process carried out using only UV.
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Affiliation(s)
- Paweł Muszyński
- Department of Chemistry, University of Life Sciences in Lublin, Akademicka Street 15, 20-950, Lublin, Poland
| | - Marzena S Brodowska
- Department of Agricultural and Environmental Chemistry, University of Life Sciences in Lublin, Akademicka Street 15, 20-950, Lublin, Poland.
| | - Tadeusz Paszko
- Department of Chemistry, University of Life Sciences in Lublin, Akademicka Street 15, 20-950, Lublin, Poland
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7
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Tang FHM, Jeffries TC, Vervoort RW, Conoley C, Coleman NV, Maggi F. Microcosm experiments and kinetic modeling of glyphosate biodegradation in soils and sediments. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 658:105-115. [PMID: 30572210 DOI: 10.1016/j.scitotenv.2018.12.179] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 12/10/2018] [Accepted: 12/11/2018] [Indexed: 06/09/2023]
Abstract
Glyphosate (GLP) is one of the most widely-used herbicides globally and its toxicity to humans and the environment is controversial. GLP is biodegradable, but little is known about the importance of site exposure history and other environmental variables on the rate and pathway of biodegradation. Here, GLP was added to microcosms of soils and sediments with different exposure histories and these were incubated with amendments of glucose, ammonium, and phosphate. GLP concentrations were measured with a newly-developed HPLC method capable of tolerating high concentrations of ammonium and amino acids. GLP biodegradation occurred after a lag-time proportional to the level of GLP pre-exposure in anthropogenically-impacted samples (soils and sediments), while no degradation occurred in samples from a pristine sediment after 180 days of incubation. Exposure history did not influence the rate of GLP degradation, after the lag-time was elapsed. Addition of C, N, and P triggered GLP degradation in pristine sediment and shortened the lag-time before degradation in other samples. In all microcosms, GLP was metabolised into aminomethylphosphonic acid (AMPA), which was highly persistent, and thus appears to be a more problematic pollutant than GLP. Bacterial communities changed along the gradients of anthropogenic impacts, but in some cases, taxonomically very-similar communities showed dramatically different activities with GLP. Our findings reveal important interactions between agriculturally-relevant nutrients and herbicides.
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Affiliation(s)
- Fiona H M Tang
- Laboratory for Advanced Environmental Engineering Research, School of Civil Engineering, The University of Sydney, Bld. J05, 2006 Sydney, NSW, Australia.
| | - Thomas C Jeffries
- School of Science and Health, Western Sydney University, 2751 Penrith, NSW, Australia
| | - R Willem Vervoort
- School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW, Australia
| | - Chris Conoley
- Environmental Earth Sciences International Pty Ltd, 82-84 Dickson Ave, Artarmon, NSW, Australia
| | - Nicholas V Coleman
- School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW, Australia
| | - Federico Maggi
- Laboratory for Advanced Environmental Engineering Research, School of Civil Engineering, The University of Sydney, Bld. J05, 2006 Sydney, NSW, Australia
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8
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Nguyen PY, Silva AF, Reis AC, Nunes OC, Rodrigues AM, Rodrigues JE, Cardoso VV, Benoliel MJ, Reis MAM, Oehmen A, Carvalho G. Bioaugmentation of membrane bioreactor with Achromobacter denitrificans strain PR1 for enhanced sulfamethoxazole removal in wastewater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 648:44-55. [PMID: 30110666 DOI: 10.1016/j.scitotenv.2018.08.100] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 07/19/2018] [Accepted: 08/06/2018] [Indexed: 05/26/2023]
Abstract
Achromobacter denitrificans strain PR1, previously found to harbour specific degradation pathways with high sulfamethoxazole (SMX) degradation rates, was bioaugmented into laboratory-scale membrane bioreactors (MBRs) operated under aerobic conditions to treat SMX-containing real domestic wastewater. Different hydraulic retention times (HRTs), which is related to reaction time and loading rates, were considered and found to affect the SMX removal efficiency. The availability of primary substrates was important in both bioaugmented and non-bioaugmented activated sludge (AS) for cometabolism of SMX. High HRT (24 h) resulted in low food to microorganism ratio (F/M) and low SMX removal, due to substrate limitation. Decrease in HRT from 24 h to 12 h, 6 h and finally 4 h led to gradual increases in primary substrates availability, e.g. organic compounds and ammonia, resulted in increased SMX removal efficiency and degradation rate, and is more favorable for high-rate wastewater treatment processes. After inoculation into the MBRs, the bioaugmentation strain was sustained in the reactor for a maximum of 31 days even though a significant decrease in abundance was observed. The bioaugmented MBRs showed enhanced SMX removal, especially under SMX shock loads compared to the control MBRs. The results of this study indicate that re-inoculation is required regularly after a period of time to maintain the removal efficiency of the target compound.
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Affiliation(s)
- P Y Nguyen
- UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Ana F Silva
- IBET - Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2781-901 Oeiras, Portugal; ITQB - Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Ana C Reis
- LEPABE - Chemical Engineering Department, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
| | - Olga C Nunes
- LEPABE - Chemical Engineering Department, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
| | - Alexandre M Rodrigues
- EPAL - Empresa Portuguesa das Águas Livres, S.A., Laboratório de Análises de Água, Avenida de Berlim, 15, 1800-031 Lisboa, Portugal
| | - João E Rodrigues
- EPAL - Empresa Portuguesa das Águas Livres, S.A., Laboratório de Análises de Água, Avenida de Berlim, 15, 1800-031 Lisboa, Portugal
| | - Vitor Vale Cardoso
- EPAL - Empresa Portuguesa das Águas Livres, S.A., Laboratório de Análises de Água, Avenida de Berlim, 15, 1800-031 Lisboa, Portugal
| | - Maria J Benoliel
- EPAL - Empresa Portuguesa das Águas Livres, S.A., Laboratório de Análises de Água, Avenida de Berlim, 15, 1800-031 Lisboa, Portugal
| | - Maria A M Reis
- UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Adrian Oehmen
- UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Gilda Carvalho
- UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
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Dargahi A, Ansari A, Nematollahi D, Asgari G, Shokoohi R, Samarghandi MR. Parameter optimization and degradation mechanism for electrocatalytic degradation of 2,4-diclorophenoxyacetic acid (2,4-D) herbicide by lead dioxide electrodes. RSC Adv 2019; 9:5064-5075. [PMID: 35514628 PMCID: PMC9060676 DOI: 10.1039/c8ra10105a] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Accepted: 02/04/2019] [Indexed: 02/05/2023] Open
Abstract
2,4-Dichlorophenoxyacetic acid (2,4-D) is one of the most commonly used herbicides in the world. In this work, the electro-catalytic degradation of 2,4-D herbicide from aqueous solutions was evaluated using three anode electrodes, i.e., lead dioxide coated on stainless steel 316 (SS316/β-PbO2), lead dioxide coated on a lead bed (Pb/β-PbO2), and lead dioxide coated on graphite (G/β-PbO2). The structure and morphology of the prepared electrodes were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The process of herbicide degradation was monitored during constant current electrolysis using cyclic voltammetry (CV). In this study, the experiments were designed based on the central composite design (CCD) and were analyzed and modeled by response surface methodology (RSM) to demonstrate the operational variables and the interactive effect of three independent variables on 3 responses. The effects of parameters including pH (3–11), current density (j = 1–5 mA cm−2) and electrolysis time (20–80 min) were studied. The results showed that, at j = 5 mA cm−2, by increasing the reaction time from 20 to 80 min and decreasing the pH from 11 to 3, the 2,4-D herbicide degradation efficiency using SS316/β-PbO2, Pb/β-PbO2 and G/β-PbO2 anode electrodes was observed to be 60.4, 75.9 and 89.8%, respectively. Moreover, the results showed that the highest COD and TOC removal efficiencies using the G/β-PbO2 electrode were 83.7 and 78.5%, under the conditions pH = 3, electrolysis time = 80 min and j = 5 mA cm−2, respectively. It was also found that G/β-PbO2 has lower energy consumption (EC) (5.67 kW h m−3) compared to the two other studied electrodes (SS316/β-PbO2 and Pb/β-PbO2). The results showed a good correlation between the experimental values and the predicted values of the quadratic model (P < 0.05). Results revealed that the electrochemical process using the G/β-PbO2 anode electrode has an acceptable efficiency in the degradation of 2,4-D herbicide and can be used as a proper pretreatment technique to treat wastewater containing resistant pollutants, e.g., phenoxy group herbicides (2,4-D). Optimization of process parameters by the CCD method and electrocatalytic degradation and the electrochemical degradation mechanism of 2,4-D using modified electrode anodes were investigated.![]()
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Affiliation(s)
- Abdollah Dargahi
- Department of Environmental Health Engineering
- School of Health
- Hamadan University of Medical Sciences
- Hamadan
- Iran
| | - Amin Ansari
- Department of Chemistry
- Faculty of Chemistry
- Bu-Ali-Sina University
- Hamadan
- Iran
| | - Davood Nematollahi
- Department of Chemistry
- Faculty of Chemistry
- Bu-Ali-Sina University
- Hamadan
- Iran
| | - Ghorban Asgari
- Department of Environmental Health Engineering
- School of Health
- Hamadan University of Medical Sciences
- Hamadan
- Iran
| | - Reza Shokoohi
- Department of Environmental Health Engineering
- School of Health
- Hamadan University of Medical Sciences
- Hamadan
- Iran
| | - Mohammad Reza Samarghandi
- Department of Environmental Engineering School of Public Health
- Hamadan University of Medical Sciences
- Hamadan
- Iran
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10
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Liu Q, Shen Y, Song S, He Z. Enhanced electrocatalytic hydrodechlorination of 2,4-dichlorophenoxyacetic acid by a Pd-Co3O4/Ni foam electrode. RSC Adv 2019; 9:12124-12133. [PMID: 35517021 PMCID: PMC9063476 DOI: 10.1039/c9ra01843c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 04/09/2019] [Indexed: 11/21/2022] Open
Abstract
A new Pd-Co3O4/Ni foam electrode was synthesized by a facile two-step method comprising co-electrodeposition and calcination. Compared with Ni foam-supported Pd electrodes obtained by electrodeposition or chemical deposition, the new Pd-Co3O4/Ni foam electrode exhibited greatly enhanced catalytic hydrodechlorination activity. The introduction of Co3O4 reduced the amount of Pd required. For the same degree of dechlorination of 2,4-D, only 25% of the Pd was required in the Pd-Co3O4/Ni foam electrode compared with the Ni foam electrode prepared by chemical deposition. Various characterizations indicated that Co3O4 on the surface of the Ni foam enhanced catalytic performance through accelerated generation of atomic H*. In addition, the good distribution of macropores, providing a larger specific surface area and lower electron transfer impedance, enabled more adsorption of atomic . The Pd-Co3O4/Ni foam electrode enhanced the electrocatalytic dechlorination performance.![]()
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Affiliation(s)
- Qiuxiang Liu
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals
- Zhejiang University of Technology
- Hangzhou 310032
- People's Republic of China
- College of Environment
| | - Yanting Shen
- College of Environment
- Zhejiang University of Technology
- Hangzhou 310032
- People's Republic of China
| | - Shuang Song
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals
- Zhejiang University of Technology
- Hangzhou 310032
- People's Republic of China
- College of Environment
| | - Zhiqiao He
- College of Environment
- Zhejiang University of Technology
- Hangzhou 310032
- People's Republic of China
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11
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He Z, Tong Y, Ni S, Ye X, Makwarimba CP, Huang X, Zhang S, Song S. Electrochemically reductive dechlorination of 3,6-dichloropicolinic acid on a palladium/nitrogen-doped carbon/nickel foam electrode. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.09.188] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Improvement of electrochemical reductive dechlorination of 2,4-dichlorophenoxyacetic acid using palladium catalysts prepared by a pulsed electrodeposition method. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.11.001] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Frková Z, Johansen A, de Jonge LW, Olsen P, Gosewinkel U, Bester K. Degradation and enantiomeric fractionation of mecoprop in soil previously exposed to phenoxy acid herbicides - New insights for bioremediation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 569-570:1457-1465. [PMID: 27432728 DOI: 10.1016/j.scitotenv.2016.06.236] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 06/28/2016] [Accepted: 06/29/2016] [Indexed: 06/06/2023]
Abstract
Phenoxy acid-contaminated subsoils are common as a result of irregular disposal of residues and production wastes in the past. For enhancing in situ biodegradation at reducing conditions, biostimulation may be an effective option. Some phenoxy acids were marketed in racemic mixtures, and biodegradation rates may differ between enantiomers. Therefore, enantio-preferred degradation of mecoprop (MCPP) in soil was measured to get in-depth information on whether amendment with glucose (BOD equivalents as substrate for microbial growth) and nitrate (redox equivalents for oxidation) can stimulate bioremediation. The degradation processes were studied in soil sampled at different depths (3, 4.5 and 6m) at a Danish urban site with a history of phenoxy acid contamination. We observed preferential degradation of the R-enantiomer only under aerobic conditions in the soil samples from 3- and 6-m depth at environmentally relevant (nM) MCPP concentrations: enantiomer fraction (EF)<0.5. On the other hand, we observed preferential degradation of the S-enantiomer in all samples and treatments at elevated (μM) MCPP concentrations: EF>0.5. Three different microbial communities were discriminated by enantioselective degradation of MCPP: 1) aerobic microorganisms with little enantioselectivity, 2) aerobic microorganisms with R-selectivity and 3) anaerobic denitrifying organisms with S-selectivity. Glucose-amendment did not enhance MCPP degradation, while nitrate amendment enhanced the degradation of high concentrations of the herbicide.
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Affiliation(s)
- Zuzana Frková
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark; Biology Centre, Czech Academy of Sciences, Branišovská 31, 37005, České Budějovice, Czech Republic
| | - Anders Johansen
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | | | - Preben Olsen
- Department of Agroecology, Aarhus University, Blichers Allé 20, 8830 Tjele, Denmark
| | - Ulrich Gosewinkel
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Kai Bester
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark.
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Vandermaesen J, Horemans B, Degryse J, Boonen J, Walravens E, Springael D. Mineralization of the Common Groundwater Pollutant 2,6-Dichlorobenzamide (BAM) and its Metabolite 2,6-Dichlorobenzoic Acid (2,6-DCBA) in Sand Filter Units of Drinking Water Treatment Plants. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:10114-22. [PMID: 27533590 DOI: 10.1021/acs.est.6b01352] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The intrinsic capacity to mineralize the groundwater pollutant 2,6-dichlorobenzamide (BAM) and its metabolite 2,6-dichlorobenzoic acid (2,6-DCBA) was evaluated in samples from sand filters (SFs) of drinking water treatment plants (DWTPs). Whereas BAM mineralization occurred rarely and only in SFs exposed to BAM, 2,6-DCBA mineralization was common in SFs, including those treating uncontaminated water. Nevertheless, SFs treating BAM contaminated water showed the highest 2,6-DCBA mineralization rates. For comparison, 2,6-DCBA and BAM mineralization were determined in various topsoil samples. As in SF samples, BAM mineralization was rare, whereas 2,6-DCBA mineralization capacity appeared widespread, with high mineralization rates found especially in forest soils. Multivariate analysis showed that in both SF and soil samples, high 2,6-DCBA mineralization correlated with high organic carbon content. Adding a 2,6-DCBA degradation deficient mutant of the BAM mineralizing Aminobacter sp. MSH1 confirmed that 2,6-DCBA produced from BAM is rapidly mineralized by the endogenous microbial community in SFs showing intrinsic 2,6-DCBA mineralization. This study demonstrates that (i) 2,6-DCBA mineralization is widely established in SFs of DWTPs, allowing the mineralization of 2,6-DCBA produced during BAM degradation and (ii) the first metabolic step in BAM mineralization is rare in microbial communities, rather than its further degradation beyond 2,6-DCBA.
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Affiliation(s)
- Johanna Vandermaesen
- KU Leuven, Division of Soil and Water Management, Kasteelpark Arenberg 20 bus 2459, B-3001 Heverlee, Belgium
| | - Benjamin Horemans
- KU Leuven, Division of Soil and Water Management, Kasteelpark Arenberg 20 bus 2459, B-3001 Heverlee, Belgium
| | - Julie Degryse
- Centraal laboratorium, De Watergroep, Researchpark Haasrode Leuven 1834 - Technologielaan 23, B-3001 Heverlee, Belgium
| | - Jos Boonen
- Centraal laboratorium, De Watergroep, Researchpark Haasrode Leuven 1834 - Technologielaan 23, B-3001 Heverlee, Belgium
| | - Eddy Walravens
- Centraal laboratorium, De Watergroep, Researchpark Haasrode Leuven 1834 - Technologielaan 23, B-3001 Heverlee, Belgium
| | - Dirk Springael
- KU Leuven, Division of Soil and Water Management, Kasteelpark Arenberg 20 bus 2459, B-3001 Heverlee, Belgium
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15
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Sekhar A, Horemans B, Aamand J, Sørensen SR, Vanhaecke L, Bussche JV, Hofkens J, Springael D. Surface Colonization and Activity of the 2,6-Dichlorobenzamide (BAM) Degrading Aminobacter sp. Strain MSH1 at Macro- and Micropollutant BAM Concentrations. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:10123-33. [PMID: 27537851 DOI: 10.1021/acs.est.6b01978] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Aminobacter sp. MSH1 uses the groundwater micropollutant 2,6-dichlorobenzamide (BAM) as a C and N source and is a potential catalyst for biotreatment of BAM-contaminated groundwater in filtration units of drinking water treatment plants (DWTPs). The oligotrophic environment of DWTPs including trace pollutant concentrations, and the high flow rates impose challenges for micropollutant biodegradation in DWTPs. To understand how trace BAM concentrations affect MSH1 surface colonization and BAM degrading activity, MSH1 was cultivated in flow channels fed continuously with BAM macro- and microconcentrations in a N- and C-limiting medium. At all BAM concentrations, MSH1 colonized the flow channel. BAM degradation efficiencies were concentration-dependent, ranging between 70 and 95%. Similarly, BAM concentration affected surface colonization, but at 100 μg/L BAM and lower, colonization was similar to that in systems without BAM, suggesting that assimilable organic carbon and nitrogen other than those supplied by BAM sustained colonization at BAM microconcentrations. Comparison of specific BAM degradation rates in flow channels and in cultures of suspended freshly grown cells indicated that starvation conditions in flow channels receiving BAM microconcentrations resulted into MSH1 biomasses with 10-100-times reduced BAM degrading activity and provided a kinetic model for predicting BAM degradation under continuous C and N starvation.
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Affiliation(s)
- Aswini Sekhar
- Division of Soil and Water Management, KU Leuven , Kasteelpark Arenberg 20, BE-3001 Leuven, Belgium
| | - Benjamin Horemans
- Division of Soil and Water Management, KU Leuven , Kasteelpark Arenberg 20, BE-3001 Leuven, Belgium
| | - Jens Aamand
- Department of Geochemistry, Geological Survey of Greenland and Denmark (GEUS) , DK-1350 Copenhagen, Denmark
| | - Sebastian R Sørensen
- Department of Geochemistry, Geological Survey of Greenland and Denmark (GEUS) , DK-1350 Copenhagen, Denmark
| | - Lynn Vanhaecke
- Department of Veterinary Public Health and Food Safety, Laboratory of Chemical Analysis, UGent , BE-9000 Ghent, Belgium
| | - Julie Vanden Bussche
- Department of Veterinary Public Health and Food Safety, Laboratory of Chemical Analysis, UGent , BE-9000 Ghent, Belgium
| | - Johan Hofkens
- Molecular Imaging and Photonics, KU Leuven , Celestijnenlaan 200 F, BE-3001 Leuven, Belgium
| | - Dirk Springael
- Division of Soil and Water Management, KU Leuven , Kasteelpark Arenberg 20, BE-3001 Leuven, Belgium
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16
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Application of biodegradation in mitigating and remediating pesticide contamination of freshwater resources: state of the art and challenges for optimization. Appl Microbiol Biotechnol 2016; 100:7361-76. [DOI: 10.1007/s00253-016-7709-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 06/26/2016] [Accepted: 06/27/2016] [Indexed: 10/21/2022]
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Saleh O, Pagel H, Enowashu E, Devers M, Martin-Laurent F, Streck T, Kandeler E, Poll C. Evidence for the importance of litter as a co-substrate for MCPA dissipation in an agricultural soil. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:4164-4175. [PMID: 25943518 DOI: 10.1007/s11356-015-4633-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 04/28/2015] [Indexed: 06/04/2023]
Abstract
Environmental controls of 2-methyl-4-chlorophenoxyacetic acid (MCPA) degradation are poorly understood. We investigated whether microbial MCPA degraders are stimulated by (maize) litter and whether this process depends on concentrations of MCPA and litter. In a microcosm experiment, different amounts of litter (0, 10 and 20 g kg(-1)) were added to soils exposed to three levels of the herbicide (0, 5 and 30 mg kg(-1)). The treated soils were incubated at 20 °C for 6 weeks, and samples were taken after 1, 3 and 6 weeks of incubation. In soils with 5 mg kg(-1) MCPA, about 50 % of the MCPA was dissipated within 1 week of the incubation. Almost complete dissipation of the herbicide had occurred by the end of the incubation with no differences between the three litter amendments. At the higher concentration (30 mg kg(-1)), MCPA endured longer in the soil, with only 31 % of the initial amount being removed at the end of the experiment in the absence of litter. Litter addition greatly increased the dissipation rate with 70 and 80 % of the herbicide being dissipated in the 10 and 20 g kg(-1) litter treatments, respectively. Signs of toxic effects of MCPA on soil bacteria were observed from related phospholipid fatty acid (PLFA) analyses, while fungi showed higher tolerance to the increased MCPA levels. The abundance of bacterial tfdA genes in soil increased with the co-occurrence of litter and high MCPA concentration, indicating the importance of substrate availability in fostering MCPA-degrading bacteria and thereby improving the potential for removal of MCPA in the environment.
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Affiliation(s)
- Omar Saleh
- Institute of Soil Science and Land Evaluation, Soil Biology, University of Hohenheim, Emil-Wolff-Str. 27, D-70593, Stuttgart, Germany
- Department of Biology and Biochemistry, Birzeit University, P.O. Box 14, Birzeit, West Bank, Palestine
| | - Holger Pagel
- Institute of Soil Science and Land Evaluation, Biogeophysics, University of Hohenheim, Emil-Wolff-Str. 27, D-70593, Stuttgart, Germany
| | - Esther Enowashu
- Institute of Soil Science and Land Evaluation, Soil Biology, University of Hohenheim, Emil-Wolff-Str. 27, D-70593, Stuttgart, Germany
| | - Marion Devers
- INRA, UMR 1347 Agroécologie, 17 Rue Sully, BP 8 6510, F-21065, Dijon, Cedex, France
| | | | - Thilo Streck
- Institute of Soil Science and Land Evaluation, Biogeophysics, University of Hohenheim, Emil-Wolff-Str. 27, D-70593, Stuttgart, Germany
| | - Ellen Kandeler
- Institute of Soil Science and Land Evaluation, Soil Biology, University of Hohenheim, Emil-Wolff-Str. 27, D-70593, Stuttgart, Germany
| | - Christian Poll
- Institute of Soil Science and Land Evaluation, Soil Biology, University of Hohenheim, Emil-Wolff-Str. 27, D-70593, Stuttgart, Germany.
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18
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Aisopou A, Binning PJ, Albrechtsen HJ, Bjerg PL. Modeling the Factors Impacting Pesticide Concentrations in Groundwater Wells. GROUND WATER 2015; 53:722-736. [PMID: 25243476 DOI: 10.1111/gwat.12264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Accepted: 07/21/2014] [Indexed: 06/03/2023]
Abstract
This study examines the effect of pumping, hydrogeology, and pesticide characteristics on pesticide concentrations in production wells using a reactive transport model in two conceptual hydrogeologic systems; a layered aquifer with and without a stream present. The pumping rate can significantly affect the pesticide breakthrough time and maximum concentration at the well. The effect of the pumping rate on the pesticide concentration depends on the hydrogeology of the aquifer; in a layered aquifer, a high pumping rate resulted in a considerably different breakthrough than a low pumping rate, while in an aquifer with a stream the effect of the pumping rate was insignificant. Pesticide application history and properties have also a great impact on the effect of the pumping rate on the concentration at the well. The findings of the study show that variable pumping rates can generate temporal variability in the concentration at the well, which helps understanding the results of groundwater monitoring programs. The results are used to provide guidance on the design of pumping and regulatory changes for the long-term supply of safe groundwater. The fate of selected pesticides is examined, for example, if the application of bentazone in a region with a layered aquifer stops today, the concentration at the well can continue to increase for 20 years if a low pumping rate is applied. This study concludes that because of the rapid response of the pesticide concentration at the drinking water well due to changes in pumping, wellhead management is important for managing pesticide concentrations.
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Affiliation(s)
| | - Philip J Binning
- Department of Environmental Engineering, Technical University of Denmark, Miljoevej, Building 113, DK-2800, Kongens Lyngby, Denmark
| | - Hans-Jørgen Albrechtsen
- Department of Environmental Engineering, Technical University of Denmark, Miljoevej, Building 113, DK-2800, Kongens Lyngby, Denmark
| | - Poul L Bjerg
- Department of Environmental Engineering, Technical University of Denmark, Miljoevej, Building 113, DK-2800, Kongens Lyngby, Denmark
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19
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Kowalczyk A, Martin TJ, Price OR, Snape JR, van Egmond RA, Finnegan CJ, Schäfer H, Davenport RJ, Bending GD. Refinement of biodegradation tests methodologies and the proposed utility of new microbial ecology techniques. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2015; 111:9-22. [PMID: 25450910 DOI: 10.1016/j.ecoenv.2014.09.021] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 09/22/2014] [Accepted: 09/23/2014] [Indexed: 06/04/2023]
Abstract
Society's reliance upon chemicals over the last few decades has led to their increased production, application and release into the environment. Determination of chemical persistence is crucial for risk assessment and management of chemicals. Current established OECD biodegradation guidelines enable testing of chemicals under laboratory conditions but with an incomplete consideration of factors that can impact on chemical persistence in the environment. The suite of OECD biodegradation tests do not characterise microbial inoculum and often provide little insight into pathways of degradation. The present review considers limitations with the current OECD biodegradation tests and highlights novel scientific approaches to chemical fate studies. We demonstrate how the incorporation of molecular microbial ecology methods (i.e., 'omics') may improve the underlying mechanistic understanding of biodegradation processes, and enable better extrapolation of data from laboratory based test systems to the relevant environment, which would potentially improve chemical risk assessment and decision making. We outline future challenges for relevant stakeholders to modernise OECD biodegradation tests and put the 'bio' back into biodegradation.
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Affiliation(s)
- Agnieszka Kowalczyk
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom.
| | - Timothy James Martin
- School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom
| | - Oliver Richard Price
- Unilever, Safety & Environmental Assurance Centre, Colworth Science Park, Sharnbrook MK441LQ, United Kingdom
| | | | - Roger Albert van Egmond
- Unilever, Safety & Environmental Assurance Centre, Colworth Science Park, Sharnbrook MK441LQ, United Kingdom
| | - Christopher James Finnegan
- Unilever, Safety & Environmental Assurance Centre, Colworth Science Park, Sharnbrook MK441LQ, United Kingdom
| | - Hendrik Schäfer
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Russell James Davenport
- School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom
| | - Gary Douglas Bending
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom
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20
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Omidi F, Behbahani M, Sadeghi Abandansari H, Sedighi A, Shahtaheri SJ. Application of molecular imprinted polymer nanoparticles as a selective solid phase extraction for preconcentration and trace determination of 2,4-dichlorophenoxyacetic acid in the human urine and different water samples. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2014; 12:137. [PMID: 25426299 PMCID: PMC4240808 DOI: 10.1186/s40201-014-0137-z] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2013] [Accepted: 10/29/2014] [Indexed: 05/31/2023]
Abstract
A molecular-imprinted polymer nanoparticles (MIP-NP) for the selective preconcentration of 2,4-dichlorophenoxyacetic acid (2,4-D) is described. It was obtained by precipitation polymerization from methacrylic acid (the functional monomer), ethylene glycol dimethacrylate (the cross-linker), 2,2'-azobisisobutyronitrile (the initiator) and 2,4-D (the template molecule) in acetonitrile solution. The MIP-NPs were characterized by thermogravimetric analysis, and by scanning electron microscopy. Imprinted 2,4-D molecules were removed from the polymeric structure using acetic acid in methanol (15:85 v/v %) as the eluting solvent. The sorption and desorption process occur within 10 min and 15 min, respectively. The maximum sorbent capacity of the molecular imprinted polymer is 89.2 mg g(-1). The relative standard deviation and limit of detection for water samples by introduced selective solid phase extraction were 4.2% and 1.25 μg L(-1), and these data for urine samples were 4.7% and 1.80 μg L(-1), respectively. The method was applied to the determination of 2,4-D in the urine and different water samples.
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Affiliation(s)
- Fariborz Omidi
- />Department of Occupational Health Engineering, School of Public Health, Shahroud University of Medical Sciences, Shahroud, Iran
| | | | | | - Alireza Sedighi
- />Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Seyed Jamaleddin Shahtaheri
- />Department of Occupational Health Engineering, School of Public Health and Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
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21
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Gan Z, Sun H, Wang R, Hu H, Zhang P, Ren X. Transformation of acesulfame in water under natural sunlight: joint effect of photolysis and biodegradation. WATER RESEARCH 2014; 64:113-122. [PMID: 25046375 DOI: 10.1016/j.watres.2014.07.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Revised: 06/30/2014] [Accepted: 07/01/2014] [Indexed: 06/03/2023]
Abstract
The transformation of acesulfame in water under environmentally relevant conditions, including direct and indirect photolysis, biodegradation, and hydrolysis, was systematically evaluated. Under natural sunlight, both direct and indirect photolysis of acesulfame were negligible in sterilized systems at neutral or alkaline pH, whereas direct photolysis occurred at pH of 4 with a rate constant of 0.0355 d(-1) in deionized water. No significant reduction in acesulfame contents was found in the dark controls or in the incubation experiments, indicating acesulfame was resistant to hydrolysis and biodegradation. In unsterilized systems, photolysis was substantially enhanced, implying that there was a joint effect of photolysis and biodegradation or that the sterilization process had the secondary effect of inactivating some photosensitizers. The near-surface summer half-life of acesulfame in the water from the Haihe River was 9 d. Specific experiments revealed the involvement of (1)O2/(3)DOM* in acesulfame photolysis, whereas OH exhibited only a slight contribution in the presence of DOM or bicarbonate. As indicated by the total organic carbon data, no significant mineralization occurred in both sterilized and unsterilized systems after acesulfame was irradiated under simulated sunlight for 7 d, suggesting the generation of persistent intermediates. Finally, major degradation intermediates were analyzed, and the degradation pathways of acesulfame under environmentally relevant conditions were proposed for the first time.
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Affiliation(s)
- Zhiwei Gan
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Hongwen Sun
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
| | - Ruonan Wang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Hongwei Hu
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Pengfei Zhang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Xinhao Ren
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
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Kolvenbach BA, Helbling DE, Kohler HPE, Corvini PFX. Emerging chemicals and the evolution of biodegradation capacities and pathways in bacteria. Curr Opin Biotechnol 2013; 27:8-14. [PMID: 24863891 DOI: 10.1016/j.copbio.2013.08.017] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 08/12/2013] [Accepted: 08/26/2013] [Indexed: 11/24/2022]
Abstract
The number of new chemicals produced is increasing daily by the thousands, and it is inevitable that many of these chemicals will reach the environment. Current research provides an understanding of how the evolution of promiscuous enzymes and the recruitment of enzymes available from the metagenome allows for the assembly of these pathways. Nevertheless, physicochemical constraints including bioavailability, bioaccessibility, and the structural variations of similar chemicals limit the evolution of biodegradation pathways. Similarly, physiological constraints related to kinetics and substrate utilization at low concentrations likewise limit chemical-enzyme interactions and consequently evolution. Considering these new data, the biodegradation decalogue still proves valid while at the same time the underlying mechanisms are better understood.
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Affiliation(s)
- Boris A Kolvenbach
- University of Applied Sciences and Arts Northwestern Switzerland, School for Life Sciences, Institute for Ecopreneurship, Gruendenstrasse 40, Muttenz 4132, Switzerland
| | - Damian E Helbling
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Environmental Microbiology, Ueberlandstrasse 133, P.O. Box 611, Duebendorf 8600, Switzerland
| | - Hans-Peter E Kohler
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Environmental Microbiology, Ueberlandstrasse 133, P.O. Box 611, Duebendorf 8600, Switzerland
| | - Philippe F-X Corvini
- University of Applied Sciences and Arts Northwestern Switzerland, School for Life Sciences, Institute for Ecopreneurship, Gruendenstrasse 40, Muttenz 4132, Switzerland; State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University Xianlin Campus, Xianlin Avenue 163, Nanjing 210023, China.
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Johnsen AR, Binning PJ, Aamand J, Badawi N, Rosenbom AE. The gompertz function can coherently describe microbial mineralization of growth-sustaining pesticides. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:8508-14. [PMID: 23796023 DOI: 10.1021/es400861v] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Mineralization of (14)C-labeled tracers is a common way of studying the environmental fate of xenobiotics, but it can be difficult to extract relevant kinetic parameters from such experiments since complex kinetic functions or several kinetic functions may be needed to adequately describe large data sets. In this study, we suggest using a two-parameter, sigmoid Gompertz function for parametrizing mineralization curves. The function was applied to a data set of 252 normalized mineralization curves that represented the potential for degradation of the herbicide MCPA in three horizons of an agricultural soil. The Gompertz function fitted most of the normalized curves, and trends in the data set could be visualized by a scatter plot of the two Gompertz parameters (rate constant and time delay). For agricultural topsoil, we also tested the effect of the MCPA concentration on the mineralization kinetics. Reduced initial concentrations lead to shortened lag-phases, probably due to reduced need for bacterial growth. The effect of substrate concentration could be predicted by simply changing the time delay of the Gompertz curves. This delay could to some extent also simulate concentration effects for 2,4-D mineralization in agricultural soil and aquifer sediment and 2,6-dichlorobenzamide mineralization in single-species, mineral medium.
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Affiliation(s)
- Anders R Johnsen
- Department of Geochemistry, Geological Survey of Denmark and Greenland (GEUS) , Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
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Yuzir A, Abdullah N, Chelliapan S, Sallis P. Effect of Mecoprop (RS)-MCPP on the biological treatment of synthetic wastewater in an anaerobic membrane bioreactor. BIORESOURCE TECHNOLOGY 2013; 133:158-65. [PMID: 23422308 DOI: 10.1016/j.biortech.2013.01.086] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 01/14/2013] [Accepted: 01/20/2013] [Indexed: 05/23/2023]
Abstract
The effects of Mecoprop (RS)-MCPP were investigated in an anaerobic membrane bioreactor (AnMBr) fed with synthetic wastewater containing stepwise increases in Mecoprop concentration, 5-200 mg L(-1) over 240 days. Effects were observed in terms of soluble chemical oxygen demand (COD) removal efficiency, volatile fatty acid (VFA) production, and methane yield. Soluble COD removal efficiency was stable at Mecoprop concentrations below 200 (±3) mg L(-1), with an average of 98 (±0.7)% removal. However, at 200 (±3) mg L(-1) Mecoprop, the COD removal efficiency decreased gradually to 94 (±1.5)%. At 5 mg L(-1) Mecoprop, acetic and propionic acid concentrations increased by 60% and 160%, respectively. In contrast, when Mecoprop was increased to 200 (±3) mg L(-1), the formation and degradation of acetate was unaffected by the higher Mecoprop concentration, acetate remaining below 35 mg L(-1). Increases in the Mecoprop specific utilization rate were observed as Mecoprop was increased stepwise between 5 and 200 mg L(-1).
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Affiliation(s)
- Ali Yuzir
- Institute of Environmental and Water Resources Management, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia.
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25
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Denitrifying capacity of rhizobial strains of Argentine soils and herbicide sensitivity. ANN MICROBIOL 2013. [DOI: 10.1007/s13213-013-0619-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Variovorax sp.-mediated biodegradation of the phenyl urea herbicide linuron at micropollutant concentrations and effects of natural dissolved organic matter as supplementary carbon source. Appl Microbiol Biotechnol 2013; 97:9837-46. [DOI: 10.1007/s00253-013-4690-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 12/27/2012] [Accepted: 12/30/2012] [Indexed: 10/27/2022]
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27
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Tang Y, Luo S, Teng Y, Liu C, Xu X, Zhang X, Chen L. Efficient removal of herbicide 2,4-dichlorophenoxyacetic acid from water using Ag/reduced graphene oxide co-decorated TiO2 nanotube arrays. JOURNAL OF HAZARDOUS MATERIALS 2012; 241-242:323-330. [PMID: 23062512 DOI: 10.1016/j.jhazmat.2012.09.050] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Revised: 09/13/2012] [Accepted: 09/20/2012] [Indexed: 06/01/2023]
Abstract
A new photocatalyst, Ag nanoparticles (NPs) and reduced graphene oxide (RGO) co-decorated TiO(2) nanotube arrays (NTs) (Ag/RGO-TiO(2) NTs), was designed and facilely produced by combining electrodeposition and photoreduction processes. The structures and properties of the photocatalysts were characterized. The ternary catalyst exhibited almost 100% photocatalytic removal efficiency of typical herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) from water under simulated solar light irradiation. The photodegradation rate toward 2,4-D over Ag/RGO-TiO(2) NTs is 11.3 times that over bare TiO(2) NTs. After 10 successive cycles with 1600 min of irradiation, Ag/RGO-TiO(2) NTs maintained as high 2,4-D removal efficiency as 97.3% with excellent stability and easy recovery, which justifies the photocatalytic system a promising application for herbicide removal from water.
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Affiliation(s)
- Yanhong Tang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR China
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28
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Gilbert N, Fulthorpe R, Kirkwood AE. Microbial diversity, tolerance, and biodegradation potential of urban wetlands with different input regimes. Can J Microbiol 2012; 58:887-97. [PMID: 22716132 DOI: 10.1139/w2012-066] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Though microbial transformations are the primary mechanism of contaminant attenuation in wetlands, much remains to be known about microbial communities in urban wetlands. In this study, the microbial communities from urban wetlands with different runoff regimes (i.e., a contaminated remnant wetland, a constructed wetland, and a remnant wetland) were assessed for their capacity to attenuate and tolerate typical urban runoff pollutants. Results from denaturing gradient gel electrophoresis of 16S rRNA genes showed relatively high similarity in community composition among the wetlands. Community-level physiological profiles had similar results but exhibited within-site variation in both the contaminated remnant and remnant wetlands. All wetland communities were less tolerant to copper than 2,4-dichlorophenoxyacetic acid; however, the contaminated remnant wetland had the highest tolerance. All study wetlands had a limited capacity to biodegrade model chlorinated aromatic compounds (e.g., 2,4-dichlorophenoxyacetic acid and 3-chlorobenzoate). Though having different input regimes and contaminant exposure histories, the study wetlands were generally similar with respect to microbial community diversity and function. Additionally, the generally low capacity for these wetlands to biodegrade mobile chlorinated organic contaminants offers preliminary insight into the limited ecosystem services these wetlands may provide in urban environments.
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Affiliation(s)
- Nicolas Gilbert
- Faculty of Science, University of Ontario Institute of Technology, Oshawa, ON, Canada
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29
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Zhu K, Baig SA, Xu J, Sheng T, Xu X. Electrochemical reductive dechlorination of 2,4-dichlorophenoxyacetic acid using a palladium/nickel foam electrode. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.03.038] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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30
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Yuzir A, Chelliapan S, Sallis PJ. Impact of the herbicide (RS)-MCPP on an anaerobic membrane bioreactor performance under different COD/nitrate ratios. BIORESOURCE TECHNOLOGY 2012; 109:31-37. [PMID: 22318083 DOI: 10.1016/j.biortech.2012.01.038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2011] [Revised: 01/09/2012] [Accepted: 01/10/2012] [Indexed: 05/31/2023]
Abstract
The degradation of (RS)-MCPP was investigated in an anaerobic membrane bioreactor (AnMBR) using nitrate as an available electron acceptor under different COD/NO(3)(-)-N ratios. Results showed high soluble COD removal efficiency (80-93%) when the reactor was operated at high COD/NO(3)(-)-N ratios. However, the COD removal started to decline (average 15%) at high nitrate concentrations coinciding with a drop in nitrate removal efficiency to 37%, suggesting that the denitrification activity dropped and affected the AnMBR performance when nitrate was the predominant electron acceptor. Additionally, the removal efficiency of (RS)-MCPP increased from 2% to 47% with reducing COD/NO(3)(-)-N ratios, whilst the (RS)-MCPP specific utilisation rate (SUR) was inversely proportional to the COD/NO(3)(-)-N ratio, suggesting that a lower COD/NO(3)(-)-N ratios had a positive influence on the (RS)-MCPP SUR. Although nitrate had a major impact on methane production rates, the methane composition was stable (approximately 80%) for COD/NO(3)(-)-N ratios of 23 or more.
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Affiliation(s)
- Ali Yuzir
- Department of Environmental Engineering, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Malaysia.
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31
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Wang YR, Chu W. Degradation of 2,4,5-trichlorophenoxyacetic acid by a novel Electro-Fe(II)/Oxone process using iron sheet as the sacrificial anode. WATER RESEARCH 2011; 45:3883-3889. [PMID: 21550624 DOI: 10.1016/j.watres.2011.04.034] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2010] [Revised: 04/02/2011] [Accepted: 04/19/2011] [Indexed: 05/30/2023]
Abstract
A novel electrochemically enhanced advanced oxidation process for the destruction of organic contaminants in aqueous solution is reported in this study. The process involves the use of an iron (Fe) sheet as sacrificial anode and a graphite bar as cathode. In the oxidation process, once an electric current is applied between the anode and the cathode, a predetermined amount of Oxone is added to the reactor. Ferrous ions generated from the sacrificed Fe anode mediate the generation of highly powerful radicals (SO(4)(•-)) through the decomposition of Oxone. The coupled process of Fe(II)/Oxone and electrochemical treatment (Electro-Fe(II)/Oxone) was evaluated in terms of 2,4,5-Trichlorophenoxyacetic acid degradation in aqueous solution. Various parameters were investigated to optimize the process, including applied current, electrolyte and Oxone concentration. In addition, low solution pH facilitates the system performance due to the dual effects of weak Fenton reagent generation and persulfate ions generation, whereas the system performance was inhibited at basic pH levels through non-radical self-dissociation of Oxone and the formation of ferric hydroxide precipitates. Furthermore, the active radicals involved in the Electro-Fe(II)/Oxone process were also identified. The Electro-Fe(II)/Oxone process demonstrates a very high 2,4,5-T degradation efficiency (over 90% decay within 10 min), which justifies the novel Electro-Fe(II)/Oxone a promising treatment process for herbicide removal in water.
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Affiliation(s)
- Y R Wang
- Department of Civil and Structural Engineering, Research Centre for Urban Environmental Technology and Management, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
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32
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Crystal Packing and Supramolecular Motifs in Four Phenoxyalkanoic Acid Herbicides—Low-Temperature Redeterminations. ACTA ACUST UNITED AC 2011. [DOI: 10.1155/2011/608165] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A low-temperature redetermination by X-ray crystallography of four phenoxyalkanoic acid herbicides, 4-chloro-2-methylphenoxyacetic acid (MCPA), rac-2-(4-chloro-2-methylphenoxy)propionic acid (MCPP), 2,4-dichlorophenoxyacetic acid (2,4-D), and 2,4-dichlorophenoxybutyric acid (2,4-DB), allowed the supramolecular structures of these compounds to be precisely described in terms of C⋯O/C–H⋯π interactions. The geometric parameters of the redetermined structures agree with those previously reported, but with improved precision.
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Raina R, Etter ML, Buehler K, Starks K, Yowin Y. Phenoxyacid Herbicides in Stormwater Retention Ponds: Urban Inputs. ACTA ACUST UNITED AC 2011. [DOI: 10.4236/ajac.2011.28112] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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34
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Sakultantimetha A, Keenan HE, Beattie TK, Bangkedphol S, Cavoura O. Effects of organic nutrients and growth factors on biostimulation of tributyltin removal by sediment microorganisms and Enterobacter cloacae. Appl Microbiol Biotechnol 2010; 90:353-60. [DOI: 10.1007/s00253-010-3023-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Revised: 11/11/2010] [Accepted: 11/15/2010] [Indexed: 11/30/2022]
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35
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Janniche GS, Lindberg E, Mouvet C, Albrechtsen HJ. Mineralization of isoproturon, mecoprop and acetochlor in a deep unsaturated limestone and sandy aquifer. CHEMOSPHERE 2010; 81:823-31. [PMID: 20817258 DOI: 10.1016/j.chemosphere.2010.08.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2010] [Revised: 08/10/2010] [Accepted: 08/11/2010] [Indexed: 05/23/2023]
Abstract
Isoproturon (N,N-dimethyl-N'-[4-(1-methylethyl)phenyl]urea), mecoprop (MCPP) (2-(4-chloro-2-methylphenoxy)propanoic acid) and acetochlor (2-chloro-N-(2-ethoxymethyl)-N-(2-ethyl-6-methylphenyl)acetamide) are agricultural pesticides that may leach through the vadose zone down to groundwater. Sediment samples were collected from intact sediment cores from 0 to 59 m below surface, including soil, unsaturated limestone and aquifer sand. In the unsaturated limestone, the initial pesticide concentrations (0.5-100 μg kg(-1)) did not systematically affect the proportion of mineralized pesticides or the kinetics. However, in the aquifer, mecoprop and to some degree isoproturon mineralization was found to increase with increasing initial concentration (0.5-100 μg L(-1) equivalent to 1-220 μg kg(-1)) demonstrating the importance of using environmentally relevant concentrations when predicting pesticide fate. The mineralization of isoproturon, mecoprop and acetochlor was studied in 40 samples at low concentrations (1-3 μg L(-1)) and specific pesticide-mineralizing bacteria were enumerated using 14C-MPN. Presence of the mineralizers documented a degradation potential of the pesticides within the catchment. The number of mineralizers varied from <0.18 to >16000 g(-1) and was not found to correlate with depth. Mecoprop, isoproturon and acetochlor were substantially mineralized in the soils (19-44% after 8months incubation at 1 μg kg(-1)), in sub-surface unsaturated limestone samples (≤2% for acetochlor, ≤21% for isoproturon and ≤31% for mecoprop) and in aquifer samples (4-28% for mecoprop, ≤4.7% for isoproturon and ≤5.6% for acetochlor). The finding of isoproturon and acetochlor mineralization in deep aquifers is novel and important for the evaluation of the fate of these pesticides, as even low mineralization rates can be important in aquifers exhibiting long residence times.
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Affiliation(s)
- G S Janniche
- DTU Environment, Department of Environmental Engineering, Technical University of Denmark, Miljoevej, Building 113, DK-2800 Kgs. Lyngby, Denmark.
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36
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Folberth C, Suhadolc M, Scherb H, Munch JC, Schroll R. Batch experiments versus soil pore water extraction--what makes the difference in isoproturon (bio-)availability? CHEMOSPHERE 2009; 77:756-763. [PMID: 19748113 DOI: 10.1016/j.chemosphere.2009.08.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2009] [Revised: 08/17/2009] [Accepted: 08/18/2009] [Indexed: 05/28/2023]
Abstract
Two approaches to determine pesticide (bio-)availability in soils (i) batch experiments with "extraction with an excess of water" (EEW) and (ii) the recently introduced "soil pore water (PW) extraction" of pesticide incubated soil samples have been compared with regard to the sorption behavior of the model compound isoproturon in soils. A significant correlation between TOC and adsorbed pesticide amount was found when using the EEW approach. In contrast, there was no correlation between TOC and adsorbed isoproturon when using the in situ PW extraction method. Furthermore, sorption was higher at all concentrations in the EEW method when comparing the distribution coefficients (K(d)) for both methods. Over all, sorption in incubated soil samples at an identical water tension (-15 kPa) and soil density (1.3 g cm(-3)) appears to be controlled by a complex combination of sorption driving soil parameters. Isoproturon bioavailability was found to be governed in different soils by binding strength and availability of sorption sites as well as water content, whereas the dominance of either one of these factors seems to depend on the individual composition and characteristics of the respective soil sample. Using multiple linear regression analysis we obtained furthermore indications that the soil pore structure is affected by the EEW method due to disaggregation, resulting in a higher availability of pesticide sorption sites than in undisturbed soil samples. Therefore, it can be concluded that isoproturon sorption is overestimated when using the EEW method, which should be taken into account when using data from this approach or similar batch techniques for risk assessment analysis.
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Affiliation(s)
- Christian Folberth
- Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Institute of Soil Ecology, 85764 Neuherberg, Germany
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37
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Sørensen SR, Simonsen A, Aamand J. Constitutive mineralization of low concentrations of the herbicide linuron by a Variovorax sp. strain. FEMS Microbiol Lett 2009; 292:291-6. [PMID: 19187207 DOI: 10.1111/j.1574-6968.2009.01501.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The mineralization of the herbicide linuron at concentrations of microg and mg L(-1) was studied in liquid batch experiments with Variovorax sp. strain SRS16. The strain was highly efficient at mineralizing a range of linuron concentrations (0.002-10 mg L(-1)) with 20-60% of the added (14)C-ring-labeled linuron metabolized to (14)CO(2) within hours to days depending on the initial linuron concentration and incubation period. At mg L(-1) linuron concentrations the mineralization activity by SRS16 was inducible and a shift to constitutive mineralization activity was apparent with a reduction in the linuron concentration to microg L(-1) levels. This study revealed that strain SRS16 is a promising candidate for bioaugmentation of water or soil resources contaminated with low linuron concentrations.
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Affiliation(s)
- Sebastian R Sørensen
- Department of Geochemistry, Geological Survey of Denmark and Greenland (GEUS), Copenhagen K, Denmark.
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