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Ivanova B. Stochastic Dynamic Mass Spectrometric Quantitative and Structural Analyses of Pharmaceutics and Biocides in Biota and Sewage Sludge. Int J Mol Sci 2023; 24:ijms24076306. [PMID: 37047279 PMCID: PMC10094044 DOI: 10.3390/ijms24076306] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2023] [Revised: 03/17/2023] [Accepted: 03/25/2023] [Indexed: 03/30/2023] Open
Abstract
Mass spectrometric innovations in analytical instrumentation tend to be accompanied by the development of a data-processing methodology, expecting to gain molecular-level insights into real-life objects. Qualitative and semi-quantitative methods have been replaced routinely by precise, accurate, selective, and sensitive quantitative ones. Currently, mass spectrometric 3D molecular structural methods are attractive. As an attempt to establish a reliable link between quantitative and 3D structural analyses, there has been developed an innovative formula [DSD″,tot=∑inDSD″,i=∑in2.6388.10−17×Ii2¯−Ii¯2] capable of the exact determination of the analyte amount and its 3D structure. It processed, herein, ultra-high resolution mass spectrometric variables of paracetamol, atenolol, propranolol, and benzalkonium chlorides in biota, using mussel tissue and sewage sludge. Quantum chemistry and chemometrics were also used. Results: Data on mixtures of antibiotics and surfactants in biota and the linear dynamic range of concentrations 2–80 ng.(mL)−1 and collision energy CE = 5–60 V are provided. Quantitative analysis of surfactants in biota via calibration equation ln[D″SD] = f(conc.) yields the exact parameter |r| = 0.99991, examining the peaks of BAC-C12 at m/z 212.209 ± 0.1 and 211.75 ± 0.15 for tautomers of fragmentation ions. Exact parameter |r| = 1 has been obtained, correlating the theory and experiments in determining the 3D molecular structures of ions of paracetamol at m/z 152, 158, 174, 301, and 325 in biota.
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Affiliation(s)
- Bojidarka Ivanova
- Lehrstuhl für Analytische Chemie, Institut für Umweltforschung, Fakultät für Chemie und Chemische Biologie, Universität Dortmund, Otto-Hahn-Straße 6, 44221 Dortmund, Nordrhein-Westfalen, Germany
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Couto E, Assemany PP, Assis Carneiro GC, Ferreira Soares DC. The potential of algae and aquatic macrophytes in the pharmaceutical and personal care products (PPCPs) environmental removal: a review. CHEMOSPHERE 2022; 302:134808. [PMID: 35508259 DOI: 10.1016/j.chemosphere.2022.134808] [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: 05/10/2021] [Revised: 04/02/2022] [Accepted: 04/28/2022] [Indexed: 06/14/2023]
Abstract
The presence of emerging contaminants, such as pharmaceuticals and personal care products (PPCPs), in aquatic environments has received increasing attention in the last years due to the various possible impacts on the dynamics of the natural environment and human health. In global terms, around 771 active pharmaceutical substances or their transformation products have been detected at levels above their respective detection limit. Additionally, 528 different compounds have been detected in 159 countries. Seeking to overcome potential ecotoxicological problems, several studies have been conducted using different technologies for PPCPs removal. Recently, the use of macro, microalgae, and aquatic macrophytes has been highlighted due to the excellent bioremediation capacity of these organisms and easy acclimatization. Thus, the present review aims to outline a brief and well-oriented scenario concerning the knowledge about the bioremediation alternatives of PPCPs through the use of macro, microalgae, and aquatic macrophytes. The characteristics of PPCPs and the risks of these compounds to the environment and human health are also addressed. Moreover, the review indicates the opportunities and challenges for expanding the use of biotechnologies based on algae and aquatic macrophytes, such as studies dedicated to relate the operational criteria of these biotechnologies with the main PPCPs removal mechanisms. Finally, algae and macrophytes can compose green and ecological biotechnologies for wastewater treatment, having great contribution to PPCPs removal.
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Affiliation(s)
- Eduardo Couto
- Federal University of Itajuba, Institute of Pure and Applied Sciences, Campus Itabira. Rua Irmã Ivone Drumond, 200 Itabira, Minas Gerais, Brazil.
| | - Paula Peixoto Assemany
- Federal University of Lavras, Environmental Engineering Department, Campus Universitário, Lavras, Minas Gerais, Brazil
| | - Grazielle Cristina Assis Carneiro
- Federal University of Itajuba, Institute of Pure and Applied Sciences, Campus Itabira. Rua Irmã Ivone Drumond, 200 Itabira, Minas Gerais, Brazil
| | - Daniel Cristian Ferreira Soares
- Federal University of Itajuba, Institute of Pure and Applied Sciences, Campus Itabira. Rua Irmã Ivone Drumond, 200 Itabira, Minas Gerais, Brazil
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Rutere C, Posselt M, Ho A, Horn MA. Biodegradation of metoprolol in oxic and anoxic hyporheic zone sediments: unexpected effects on microbial communities. Appl Microbiol Biotechnol 2021; 105:6103-6115. [PMID: 34338804 PMCID: PMC8390428 DOI: 10.1007/s00253-021-11466-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 07/19/2021] [Accepted: 07/20/2021] [Indexed: 11/29/2022]
Abstract
Abstract Metoprolol is widely used as a beta-blocker and considered an emerging contaminant of environmental concern due to pseudo persistence in wastewater effluents that poses a potential ecotoxicological threat to aquatic ecosystems. Microbial removal of metoprolol in the redox-delineated hyporheic zone (HZ) was investigated using streambed sediments supplemented with 15 or 150 μM metoprolol in a laboratory microcosm incubation under oxic and anoxic conditions. Metoprolol disappeared from the aqueous phase under oxic and anoxic conditions within 65 and 72 days, respectively. Metoprolol was refed twice after initial depletion resulting in accelerated disappearance under both conditions. Metoprolol disappearance was marginal in sterile control microcosms with autoclaved sediment. Metoprolol was transformed mainly to metoprolol acid in oxic microcosms, while metoprolol acid and α-hydroxymetoprolol were formed in anoxic microcosms. Transformation products were transient and disappeared within 30 days under both conditions. Effects of metoprolol on the HZ bacterial community were evaluated using DNA- and RNA-based time-resolved amplicon Illumina MiSeq sequencing targeting the 16S rRNA gene and 16S rRNA, respectively, and were prominent on 16S rRNA rather than 16S rRNA gene level suggesting moderate metoprolol-induced activity-level changes. A positive impact of metoprolol on Sphingomonadaceae and Enterobacteriaceae under oxic and anoxic conditions, respectively, was observed. Nitrifiers were impaired by metoprolol under oxic and anoxic conditions. Collectively, our findings revealed high metoprolol biodegradation potentials in the hyporheic zone under contrasting redox conditions associated with changes in the active microbial communities, thus contributing to the attenuation of micropollutants. Key points • High biotic oxic and anoxic metoprolol degradation potentials in the hyporheic zone. • Key metoprolol-associated taxa included Sphingomonadaceae, Enterobacteraceae, and Promicromonosporaceae. • Negative impact of metoprolol on nitrifiers. Supplementary Information The online version contains supplementary material available at 10.1007/s00253-021-11466-w.
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Affiliation(s)
- Cyrus Rutere
- Department of Ecological Microbiology, University of Bayreuth, Bayreuth, Germany.,Institute of Microbiology, Leibniz University Hannover, Herrenhäuser Straße 2, Hannover, Germany
| | - Malte Posselt
- Department of Environmental Science, Stockholm University, Stockholm, Sweden
| | - Adrian Ho
- Institute of Microbiology, Leibniz University Hannover, Herrenhäuser Straße 2, Hannover, Germany
| | - Marcus A Horn
- Department of Ecological Microbiology, University of Bayreuth, Bayreuth, Germany. .,Institute of Microbiology, Leibniz University Hannover, Herrenhäuser Straße 2, Hannover, Germany.
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Kang D, Doudrick K, Park N, Choi Y, Kim K, Jeon J. Identification of transformation products to characterize the ability of a natural wetland to degrade synthetic organic pollutants. WATER RESEARCH 2020; 187:116425. [PMID: 32979581 DOI: 10.1016/j.watres.2020.116425] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 07/05/2020] [Accepted: 09/12/2020] [Indexed: 06/11/2023]
Abstract
Natural wetlands have been recognized as a natural reactor for degradation and elimination of environmental pollutants. The Upo Wetland, the largest inland wetland in Korea, is mainly surrounded by agricultural lands and it is susceptible to contamination from excess nutrient loads and synthetic organic contaminants (SOCs) (e.g., pesticides). The aim of this study was to identify major SOCs in the wetland and evaluate their degradation. We used high resolution mass spectrometry (HRMS) with a two-step analysis approach (i.e., 1st analysis for target measurement along with suspect and non-target screening (SNTS) and 2nd analysis for complimentary suspect screening) to identify and quantify the transformation products (TPs) of the identified parent SOCs. Quantitative analysis of 30 targets, mainly including pesticides, showed that fungicides were the major SOCs detected in the wetland, accounting for about 50% of the composition ratio of the total SOCs quantified. Orysastrobin occurred at the highest mean concentration (>700 ng/L), followed by two other fungicides, carbendazim and tricyclazole. The first analysis (SNTS) tentatively identified 39 TPs (30 by suspect, 9 by non-target screening) of 14 parent pesticides. Additionally, the second analysis (complimentary suspect screening) identified 9 more TPs. Among the 48 total TPs identified, 7 were confirmed with reference standards. The identification of the remaining TPs had a high confidence level (e.g., level 2 or 3). Regarding transport though the wetland, most TPs showed greater peak area ratios (i.e., the relative portion of chromatographic area of the TPs to the parent compound) at the outlet point of the wetland compared to the inlet point. The risk quotient, which was calculated using the concentrations of parent compounds, decreased toward the outlet, demonstrating the degradation capacity of the wetland. The estimates for biodegradability, hydrophobicity, and toxicity by an in-silico quantitative structure-activity relationship (QSAR) model indicated a lower half-life, lower logDOW, and greater effect concentration for most TPs compared to the parent compounds. Based on these results, we conclude that natural wetlands play a role as an eco-friendly reactor for degrading SOCs to form numerous TPs that are lower risk than the parent compounds.
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Affiliation(s)
- Daeho Kang
- Graduate School of FEED of Eco-Friendly Offshore Structure, Changwon National University, Changwon, Gyeongsangnamdo, 51140, Korea
| | - Kyle Doudrick
- University of Notre Dame, Department of Civil and Environmental Engineering and Earth Sciences, USA
| | - Naree Park
- Graduate School of FEED of Eco-Friendly Offshore Structure, Changwon National University, Changwon, Gyeongsangnamdo, 51140, Korea
| | - Younghun Choi
- Graduate School of FEED of Eco-Friendly Offshore Structure, Changwon National University, Changwon, Gyeongsangnamdo, 51140, Korea
| | - Kyunghyun Kim
- Watershed and Total Load Management Research Division, National Institute of Environmental Research, Incheon, 22689, Korea
| | - Junho Jeon
- Graduate School of FEED of Eco-Friendly Offshore Structure, Changwon National University, Changwon, Gyeongsangnamdo, 51140, Korea; School of Civil, Environmental and Chemical Engineering, Changwon National University, Changwon, Gyeongsangnamdo, 51140, Korea
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Nord NB, Bester K. Can the removal of pharmaceuticals in biofilters be influenced by short pulses of carbon? THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 707:135901. [PMID: 31972906 DOI: 10.1016/j.scitotenv.2019.135901] [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: 09/03/2019] [Revised: 11/04/2019] [Accepted: 12/01/2019] [Indexed: 06/10/2023]
Abstract
Biofilters, similar to those already used for, e.g., removing particles from stormwater and combined sewer overflow can remove organic micropollutants from polluted waters. This study investigated the effects on removal of pharmaceuticals with pulse loadings of increased amounts of pre-settled raw wastewater to four individual biofilters containing different materials (sand, filtralite, stonewool, and sand amended with 1% peat). The effect of increasing BOD concentration to the removal rate constants could be divided into two groups; 1) compounds influenced by increasing loading of BOD: atenolol, propranolol, venlafaxine, citalopram, metoprolol, iohexol, and diclofenac 2) compounds only little or not influenced by increasing concentration of BOD: sulfamethoxazole, sulfamethizole, trimethoprim, iomeprol, and carbamazepine. Though BOD clearly had effects on the degradation, no indications towards a complete stop of the degradation were observed under any circumstances. The different biofilter materials influenced (indirectly) the removal of micropollutants: While the overall best performance was seen in the filtralite biofilter, the stonewool biofilter generally had the lowest removal rate constants. Furthermore, we observed different metabolic pathways of metoprolol in the four different biofilters under formation (and removal) of metoprolol acid, α-hydroxymetoprolol, and O-desmethylmetoprolol.
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Affiliation(s)
- Nadia Brogård Nord
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, Roskilde 4000, Denmark
| | - Kai Bester
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, Roskilde 4000, Denmark.
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Favier M, Van Schepdael A, Cabooter D. High-Resolution MS and MSn Investigation of UV Oxidation Products of Phenazone-type Pharmaceuticals and Metabolites. Chromatographia 2018. [DOI: 10.1007/s10337-018-3668-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Lv M, Lo C, Hsu CC, Wang Y, Chiang YR, Sun Q, Wu Y, Li Y, Chen L, Yu CP. Identification of Enantiomeric Byproducts During Microalgae-Mediated Transformation of Metoprolol by MS/MS Spectrum Based Networking. Front Microbiol 2018; 9:2115. [PMID: 30245676 PMCID: PMC6137207 DOI: 10.3389/fmicb.2018.02115] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Accepted: 08/20/2018] [Indexed: 01/03/2023] Open
Abstract
Metoprolol (MPL) is a chiral β-blocker ubiquitously detected in various environments due to its low to moderate removal in wastewater treatment plants. This study was conducted to test the potential of using microalgae to degrade emerging contaminant MPL and to characterize the enantiomeric enrichment during MPL degradation by microalgae. The results showed that PO43−- P, NO3−- N and MPL could be simultaneously removed in the synthetic effluent by the targeted microalgae species, indicating microalgae were promising in wastewater treatment. Stereoselectivity was observed during MPL degradation by microalgae, with R-form enrichment. A marginal linear relationship between MPL degradation and enantiomeric enrichment was observed, implying that the enantiomeric tool, used as a quantitative indicator of biodegradation, could possibly be applied in MPL degradation by microalgae. An efficient liquid chromatograph tandem high resolution mass spectrometry (LC-HRMS/MS) chiral analytical method was developed to identify transformation products (TPs). The results showed that MS/MS spectral similarity networking could be used as a powerful tool to quickly identify unknown TPs. A total of 6 pairs of chiral TPs were identified, among which two new TPs of MPL including hydroxy{4-[2-hydroxy-3-(isopropylamino)propoxy]phenyl}acetic acid (α-HMPLA) and 4-[2-Hydroxy-3-(isopropylamino)propoxy]benzaldehyde (DMPLD) were firstly reported, and proposed transformation pathways of MPL by microalgae were given. Considering the paired TPs detected and that the degradation of the two enantiomers followed first order kinetics, the two enantiomers likely had the same degradation mechanism.
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Affiliation(s)
- Min Lv
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China.,Graduate Institute of Environmental Engineering, National Taiwan University, Taipei, Taiwan
| | - Ching Lo
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Cheng-Chih Hsu
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Yuwen Wang
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
| | - Yin-Ru Chiang
- Biodiversity Research Center, Academia Sinica, Taipei, Taiwan
| | - Qian Sun
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
| | - Yang Wu
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
| | - Yan Li
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
| | - Lingxin Chen
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China
| | - Chang-Ping Yu
- Graduate Institute of Environmental Engineering, National Taiwan University, Taipei, Taiwan
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Al-Khazrajy OSA, Bergström E, Boxall ABA. Factors affecting the dissipation of pharmaceuticals in freshwater sediments. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2018; 37:829-838. [PMID: 29068472 DOI: 10.1002/etc.4015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 09/08/2017] [Accepted: 10/17/2017] [Indexed: 06/07/2023]
Abstract
Degradation is one of the key processes governing the impact of pharmaceuticals in the aquatic environment. Most studies on the degradation of pharmaceuticals have focused on soil and sludge, with fewer exploring persistence in aquatic sediments. We investigated the dissipation of 6 pharmaceuticals from different therapeutic classes in a range of sediment types. Dissipation of each pharmaceutical was found to follow first-order exponential decay. Half-lives in the sediments ranged from 9.5 (atenolol) to 78.8 (amitriptyline) d. Under sterile conditions, the persistence of pharmaceuticals was considerably longer. Stepwise multiple linear regression analysis was performed to explore the relationships between half-lives of the pharmaceuticals, sediment physicochemical properties, and sorption coefficients for the compounds. Sediment clay, silt, and organic carbon content and microbial activity were the predominant factors related to the degradation rates of diltiazem, cimetidine, and ranitidine. Regression analysis failed to highlight a key property which may be responsible for observed differences in the degradation of the other pharmaceuticals. The present results suggest that the degradation rate of pharmaceuticals in sediments is determined by different factors and processes and does not exclusively depend on a single sediment parameter. Environ Toxicol Chem 2018;37:829-838. © 2017 SETAC.
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Affiliation(s)
- Omar S A Al-Khazrajy
- Environment Department, University of York, Heslington, York, UK
- Department of Chemistry, College of Ibn al-Haitham, University of Baghdad, Baghdad, Iraq
| | - Ed Bergström
- Centre of Excellence in Mass Spectrometry and Department of Chemistry, University of York, Heslington, York, UK
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Koba O, Golovko O, Kodešová R, Klement A, Grabic R. Transformation of atenolol, metoprolol, and carbamazepine in soils: The identification, quantification, and stability of the transformation products and further implications for the environment. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 218:574-585. [PMID: 27514306 DOI: 10.1016/j.envpol.2016.07.041] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 07/14/2016] [Accepted: 07/18/2016] [Indexed: 05/12/2023]
Abstract
Pharmaceuticals are a large group of substances that have been recognized as environmental contaminants in recent years. Research on the pharmaceutical fate in soils is currently limited or missing. In this study, three pharmaceuticals (atenolol (ATE), carbamazepine (CAR), and metoprolol (MET)) were introduced to soils and exposed for 61 day under aerobic conditions. Thirteen different soils were used in the study to increase the understanding of pharmaceutical behaviour in the soil matrix. Ten metabolites were detected and tentatively identified. Some of them, such as atenolol acid (AAC), carbamazepine 10,11-epoxide (EPC), 10,11-dihydrocarbamazepine (DHC), trans-10,11-Dihydro-10,11-dihydroxy carbamazepine (RTC), and metoprolol acid (MAC), were consequently confirmed using commercial reference standards. It was concluded that the aerobic conditions of the experiment determined the pharmaceutical degradation pathway of studied compounds in the soils. The different amounts/rates and degradation of the transformation products can be attributed to differences in the soil properties. ATE degraded relatively quickly compared with CAR, whereas MET degradation in the soils was unclear. The persistence of CAR and its metabolites, in combination with low CAR sorption, enable the transportation of CAR and its metabolites within soils and into the ground water. Thus, CAR may cause adverse effects on the environment and humans.
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Affiliation(s)
- Olga Koba
- University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Zatisi 728/II, 389 25 Vodnany, Czech Republic.
| | - Oksana Golovko
- University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Zatisi 728/II, 389 25 Vodnany, Czech Republic
| | - Radka Kodešová
- Czech University of Life Sciences Prague, Faculty of Agrobiology, Food and Natural Resources, Dept. of Soil Science and Soil Protection, Kamýcká 129, 16521 Prague 6, Czech Republic
| | - Aleš Klement
- Czech University of Life Sciences Prague, Faculty of Agrobiology, Food and Natural Resources, Dept. of Soil Science and Soil Protection, Kamýcká 129, 16521 Prague 6, Czech Republic
| | - Roman Grabic
- University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Zatisi 728/II, 389 25 Vodnany, Czech Republic
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Jasper JT, Shafaat OS, Hoffmann MR. Electrochemical Transformation of Trace Organic Contaminants in Latrine Wastewater. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:10198-208. [PMID: 27564843 DOI: 10.1021/acs.est.6b02912] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Solar-powered electrochemical systems have shown promise for onsite wastewater treatment in regions where basic infrastructure for conventional wastewater treatment is not available. To assess the applicability of these systems for trace organic contaminant treatment, test compound electrolysis rate constants were measured in authentic latrine wastewater using mixed-metal oxide anodes coupled with stainless steel cathodes. Complete removal of ranitidine and cimetidine was achieved within 30 min of electrolysis at an applied potential of 3.5 V (0.7 A L(-1)). Removal of acetaminophen, ciprofloxacin, trimethoprim, propranolol, and carbamazepine (>80%) was achieved within 3 h of electrolysis. Oxidation of ranitidine, cimetidine, and ciprofloxacin was primarily attributed to reaction with NH2Cl. Transformation of trimethoprim, propranolol, and carbamazepine was attributed to direct electron transfer and to reactions with surface-bound reactive chlorine species. Relative contributions of aqueous phase ·OH, ·Cl, ·Cl2(-), HOCl/OCl(-), and Cl2 were determined to be negligible based on measured second-order reaction rate constants, probe compound reaction rates, and experiments in buffered Cl(-) solutions. Electrical energy per order of removal (EEO) increased with increasing applied potentials and current densities. Test compound removal was most efficient at elevated Cl(-) concentrations present when treated wastewater is recycled for use as flushing water (i.e., ∼ 75 mM Cl(-); EEO = 0.2-6.9 kWh log(-1) m(-3)). Identified halogenated and oxygenated electrolysis products typically underwent further transformations to unidentifiable products within the 3 h treatment cycle. Identifiable halogenated byproduct formation and accumulation was minimized during electrolysis of wastewater containing 75 mM Cl(-).
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Affiliation(s)
- Justin T Jasper
- Environmental Science and Engineering, California Institute of Technology Pasadena, California 91106, United States
| | - Oliver S Shafaat
- Division of Chemistry and Chemical Engineering, California Institute of Technology Pasadena, California 91106, United States
| | - Michael R Hoffmann
- Environmental Science and Engineering, California Institute of Technology Pasadena, California 91106, United States
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