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Zhao Y, Hussain A, Liu Y, Yang Z, Zhao T, Bamanu B, Su D. Electrospinning micro-nanofibers immobilized aerobic denitrifying bacteria for efficient nitrogen removal in wastewater. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 343:118230. [PMID: 37247550 DOI: 10.1016/j.jenvman.2023.118230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 05/16/2023] [Accepted: 05/19/2023] [Indexed: 05/31/2023]
Abstract
Electrospinning micro-nanofibers with exceptional physicochemical properties and biocompatibility are becoming popular in the medical field. These features indicate its potential application as microbial immobilized carriers in wastewater treatment. Here, aerobic denitrifying bacteria were immobilized on micro-nanofibers, which were prepared using different concentrations of polyacrylonitrile (PAN) solution (8%, 12% and 15%). The results of diameter distribution, specific surface area and average pore diameter indicated that 15% PAN micro-nanofibers with tighter surface structure were not suitable as microbial carriers. The bacterial load results showed that the cell density (OD600) and total protein of 12% PAN micro-nanofibers were 107.14% and 106.28% higher than those of 8% PAN micro-nanofibers. Subsequently, the 12% PAN micro-nanofibers were selected for aerobic denitrification under the different C/N ratios (1.5-10), and stable performance was obtained. Bacterial community analysis further manifested that the micro-nanofibers effectively immobilized bacteria and enriched bacterial structure under the high C/N ratios. Therefore, the feasibility of micro-nanofibers as microbial carriers was confirmed. This work was of great significance for promoting the application of electrospinning for microbial immobilization in wastewater treatment.
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Affiliation(s)
- Yingxin Zhao
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China
| | - Arif Hussain
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China
| | - Yinuo Liu
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China.
| | - Zhengwu Yang
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China
| | - Tianyang Zhao
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China
| | - Bibek Bamanu
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China
| | - Dong Su
- School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China.
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Wang Y, Peng Y, Lv C, Xu X, Meng H, Zhou Y, Wang G, Lu Y. Quantitative discrimination of algae multi-impacts on N 2O emissions in eutrophic lakes: Implications for N 2O budgets and mitigation. WATER RESEARCH 2023; 235:119857. [PMID: 36924553 DOI: 10.1016/j.watres.2023.119857] [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: 12/21/2022] [Revised: 03/02/2023] [Accepted: 03/07/2023] [Indexed: 06/18/2023]
Abstract
It is generally accepted that eutrophic lakes significantly contribute to nitrous oxide (N2O) emissions. However, how these emissions are affected by the formation, disappearance, and mechanisms of algal blooms in these lakes has not been systematically investigated. This study examined and determined the relative contribution of spatiotemporal N2O production pathways in hypereutrophic Lake Taihu. Synchronously, the multi-impacts of algae on N2O production and release potential were measured in the field and in microcosms using isotope ratios of oxygen (δ18O) and bulk nitrogen (δ15N) to N2O and to intramolecular 15N site preference (SP). Results showed that N2O production in Lake Taihu was derived from microbial effects (nitrification and incomplete denitrification) and water air exchanges. N2O production was also affected by the N2O reduction process. The mean dissolved N2O concentrations in the water column during the pre-outbreak, outbreak, and decay stages of algae accumulation were almost the same (0.05 μmol·L-1), which was 2-10 times higher than in lake areas algae was not accumulating. However, except for the central lake area, all surveyed areas (with and without accumulated algae) displayed strong release potential and acted as the emission source because of dissolved N2O supersaturation in the water column. The mean N2O release fluxes during the pre-outbreak, outbreak, and decay stages of algae accumulation areas were 17.95, 26.36, and 79.32 μmol·m-2·d-1, respectively, which were 2.0-7.5 times higher than the values in the non-algae accumulation areas. In addition, the decay and decomposition of algae released large amounts of nutrients and changed the physiochemical properties of the water column. Additionally, the increased algae biomass promoted N2O release and improved the proportion of N2O produced via denitrification process to being 9.8-20.4% microbial-derived N2O. This proportion became higher when the N2O consumption during denitrification was considered as evidenced by isotopic data. However, when the algae biomass was excessive in hypereutrophic state, the algae decomposition also consumed a large amount of oxygen, thus limiting the N2O production due to complete denitrification as well as due to the limited substrate supply of nitrate by nitrification in hypoxic or anoxic conditions. Further, the excessive algae accumulation on the water surface reduced N2O release fluxes via hindering the migration of the dissolved N2O into the atmosphere. These findings provide a new perspective and understanding for accurately evaluating N2O release fluxes driven by algae processes in eutrophic lakes.
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Affiliation(s)
- Yiping Wang
- School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, China; School of Environment, Nanjing Normal University, No.1, Wenyuan Road, Nanjing 210023, China; State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
| | - Yu Peng
- School of Environment, Nanjing Normal University, No.1, Wenyuan Road, Nanjing 210023, China
| | - Chengxu Lv
- School of Environment, Nanjing Normal University, No.1, Wenyuan Road, Nanjing 210023, China
| | - Xiaoguang Xu
- School of Environment, Nanjing Normal University, No.1, Wenyuan Road, Nanjing 210023, China.
| | - Han Meng
- School of Environment, Nanjing Normal University, No.1, Wenyuan Road, Nanjing 210023, China
| | - Yiwen Zhou
- Department of Chemical Engineering, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan
| | - Guoxiang Wang
- School of Environment, Nanjing Normal University, No.1, Wenyuan Road, Nanjing 210023, China
| | - Yongjun Lu
- State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
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Ortmeyer F, Guerreiro MA, Begerow D, Banning A. Modified microbiology through enhanced denitrification by addition of various organic substances-temperature effect. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:60282-60293. [PMID: 37022539 PMCID: PMC10163118 DOI: 10.1007/s11356-023-26784-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 03/29/2023] [Indexed: 05/08/2023]
Abstract
Worldwide, the environmental nitrate (NO3-) problem is increasingly coming into focus. These increases in NO3- concentration result mainly from agricultural inputs and are further exacerbated by decreasing and finite geogenic NO3- degradation capacity in aquifers. Thus, treatment methods are becoming more and more important. In this study, the effects of enhanced denitrification with addition of organic carbon (C) on thereby autochthonous occurring microbiology and compared at room temperature as well as 10 °C were investigated. Incubation of bacteria and fungi was carried out using natural sediments without degradation capacity and groundwater with high NO3- concentrations. Addition of the four applied substrates (acetate, glucose, ascorbic acid, and ethanol) results in major differences in microbial community. Cooling to 10 °C changes the microbiology again. Relative abundances of bacteria are strongly influenced by temperature, which is probably the explanation for different denitrification rates. Fungi are much more sensitive to the milieu change with organic C. Different fungi taxa preferentially occur at one of the two temperature approaches. Major modifications of the microbial community are mainly observed whose denitrification rates strongly depend on the temperature effect. Therefore, we assume a temperature optimum of enhanced denitrification specific to each substrate, which is influenced by the microbiology.
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Affiliation(s)
- Felix Ortmeyer
- Hydrogeology Department, Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany.
- Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350 Copenhagen and Universitetsbyen 81, 8000, Aarhus, Denmark.
| | - Marco Alexandre Guerreiro
- Department of Evolution of Plants and Fungi, Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany
- Environmental Genomics, Christian-Albrechts University of Kiel, Am Botanischen Garten 1-9, 24118, Kiel, Germany
- Max Planck Institute for Evolutionary Biology, August-Thienemann-Str. 2, 24306, Plön, Germany
| | - Dominik Begerow
- Department of Evolution of Plants and Fungi, Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany
- University of Hamburg, Institute of Plant Sciences and Microbiology, Ohnhorststr. 18, 22609, Hamburg, Germany
| | - Andre Banning
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, Cork, T23 N73K, Ireland
- University College Cork, Environmental Research Institute, Lee Road, Cork, T23 XE10, Ireland
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Pei H, Chen D, Jiang H, Xiao Z. Development of a mathematical model for a microbial denitrification co-culture system comprising acetogenic bacterium Sporomusa ovata and denitrifying bacterium Pseudomonas stutzeri. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2023; 87:2043-2060. [PMID: 37119171 DOI: 10.2166/wst.2023.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Previous study has shown that co-culturing acetogenic bacterium Sporomusa ovata (SO), with denitrifying bacterium Pseudomonas stutzeri (PS), is a promising strategy to enhance the microbial denitrification for nitrate-contaminated groundwater remediation. However, the mutual effects and reaction kinetics of these two bacteria in the co-culture system are poorly understood. In this study, a mathematical model for this co-culture system was established to fill this knowledge gap. Model simulation demonstrated that SO had a significant effect on the kinetics of denitrification by PS, while PS slightly affected the kinetics of acetate production by SO. The optimal initial HCO3-/NO3- ratio and SO/PS inoculation ratio were 0.77-1.48 and 67 for the co-culture system to achieve satisfied denitrification performance with less acetate accumulation. Finally, the minimum hydrogen supply was recommended when the initial bicarbonate and nitrate concentrations were assigned in the range of 2-20 mM and 2-4 mM for simulating the natural nitrate-contaminated groundwater treatment. These findings could provide useful insights to guide the operation and optimization of the denitrification co-culture system.
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Affiliation(s)
- Haoyi Pei
- College of Urban Construction, Nanjing Tech University, Nanjing 211816, China E-mail:
| | - Dan Chen
- College of Urban Construction, Nanjing Tech University, Nanjing 211816, China E-mail:
| | - Hongxia Jiang
- College of Urban Construction, Nanjing Tech University, Nanjing 211816, China E-mail:
| | - Zhixing Xiao
- College of Urban Construction, Nanjing Tech University, Nanjing 211816, China E-mail:
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Wang Y, Chen X, Guo B, Liu C, Liu J, Qiu G, Fu Q, Li H. Alleviation of aqueous nitrogen loss from paddy fields by growth and decomposition of duckweed (Lemna minor L.) after fertilization. CHEMOSPHERE 2023; 311:137073. [PMID: 36332733 DOI: 10.1016/j.chemosphere.2022.137073] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 10/22/2022] [Accepted: 10/28/2022] [Indexed: 06/16/2023]
Abstract
Runoff loss of nitrogen from paddy fields has received increasing attention in recent years. Duckweed is an aquatic plant frequently found in paddy fields. In this study, the effects of duckweed (Lemna minor L.) in floodwater on aqueous nitrogen losses from paddy fields were systematically investigated. Results demonstrated that the growth of duckweed decreased total nitrogen concentrations in floodwater and nitrogen runoff loss from paddy fields by 16.7%-18.3% and 11.2%-13.6%, respectively. Moreover, compared with NO3-, NH4+ was preferentially removed by duckweed. 15N isotope tracer experiments revealed that the growth and decomposition of duckweed acted as a "buffer" against the nitrogen variation in floodwater after fertilization. During the growth of duckweed, leaves were found to be the principal organ to assimilate NH4+ and release NO3- by using non-invasive micro-test technology. Duckweed degradation increased the content of hydrophobic acids and marine humic-like substances in floodwater, which promoted the migration of nitrogen from floodwater to soil. Redundancy analysis and structural equation models further illustrated that pH and temperature variation in floodwater caused by duckweed played a greater role in aqueous nitrogen loss reduction than the nitrogen accumulation in duckweed. This study suggested that the growth of duckweed in paddy fields was an effective supplementary method for controlling aqueous nitrogen loss during agricultural production.
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Affiliation(s)
- Yuan Wang
- Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Xiaodong Chen
- Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Bin Guo
- Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Chen Liu
- Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Junli Liu
- Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Gaoyang Qiu
- Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Qinglin Fu
- Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Hua Li
- Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China.
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Gibert O, Sánchez D, Cortina JL. Removal of nitrate and pesticides from groundwater by nano zero-valent iron injection pulses under biostimulation and bioaugmentation scenarios in continuous-flow packed soil columns. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 321:115965. [PMID: 35981501 DOI: 10.1016/j.jenvman.2022.115965] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/27/2022] [Accepted: 08/04/2022] [Indexed: 06/15/2023]
Abstract
This study evaluates the NO3- removal from groundwater through Heterotrophic Denitrification (HDN) (promoted by the addition of acetate and/or an inoculum rich in denitrifiers) and Abiotic Chemical Nitrate Reduction (ACNR) (promoted by pulse injection of zerovalent iron nanoparticles (nZVI)). HDN and ACNR were applied, separately or combined, in packed soil column experiments to complement the scarce research on pulse-injected nZVI in continuous-flow systems mimicking a Well-based Denitrification Barrier. Together with NO3-, the removal of two common pesticides (dieldrin and lindane) was evaluated. Results showed that total NO3- removal (>97%) could be achieved by either bioestimulation with acetate (converting NO3- to N2(g) via HDN) or by injecting nZVI (removing NO3- via ACNR). In the presence of nZVI, NO3- was partially converted to N2(g) and to a lower extent NO2-, with unreacted NO3- being likely adsorbed onto Fe-(oxy)hydroxides. Combination of both HDN and ACNR resulted in even a higher NO3- removal (>99%). Interestingly, nZVI did not seem to pose any toxic effect on denitrifiers. These results showed that both processes can be alterned or combined to take advantage of the benefits of each individual process while overcoming their disadvantages if applied alone. With regard to the target pesticides, the removal was high for dieldrin (>93%) and moderate for lindane (38%), and it was not due to biodegradation but to adsorption onto soil. When nZVI was applied, the removal increased (generally >91%) due to chemical degradation by nZVI and/or adsorption onto formed Fe-(oxy)hydroxides.
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Affiliation(s)
- Oriol Gibert
- Chemical Engineering Department, EEBE, Universitat Politècnica de Catalunya (UPC)-BarcelonaTech, c/Eduard Maristany 10-14, Barcelona, 08019, Spain; Barcelona Research Center in Multiscale Science and Engineering, EEBE, Universitat Politècnica de Catalunya (UPC)-BarcelonaTech, c/Eduard Maristany 10-14, Barcelona, 08019, Spain.
| | - Damián Sánchez
- Cetaqua-Water Technology Centre, c/ Severo Ochoa 7, 29590, Málaga, Spain
| | - José Luis Cortina
- Chemical Engineering Department, EEBE, Universitat Politècnica de Catalunya (UPC)-BarcelonaTech, c/Eduard Maristany 10-14, Barcelona, 08019, Spain; Barcelona Research Center in Multiscale Science and Engineering, EEBE, Universitat Politècnica de Catalunya (UPC)-BarcelonaTech, c/Eduard Maristany 10-14, Barcelona, 08019, Spain; Cetaqua-Water Technology Centre, Carretera d'Esplugues 75, 08940, Cornellà de Llobregat, Spain
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7
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Wang X, Yang H, Zhou Y, Liu X. Performance and mechanism analysis of gel immobilized anammox bacteria in treating different proportions of domestic wastewater: a valid alternative to granular sludge. BIORESOURCE TECHNOLOGY 2022; 347:126623. [PMID: 35017093 DOI: 10.1016/j.biortech.2021.126623] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/17/2021] [Accepted: 12/20/2021] [Indexed: 06/14/2023]
Abstract
The treatment performance of anaerobic ammonia oxidation (anammox) immobilized filler on different proportions of domestic wastewater was evaluated. The results showed that, in comparison to synthetic wastewater, 50% domestic wastewater promoted the anammox reaction of immobilized filler, while 100% domestic wastewater had no significant effect on the anammox activity of immobilized filler but the total nitrogen removal efficiency (TNRE) was improved through enhanced denitrification. The TNRE of the immobilized filler was 82.5%, which was significantly higher than that of AnGS (69.7%), and its average anammox contribution rate was more than 90%. This was because the encapsulated anammox biomass could better maintain competitive advantages and coordinate the symbiotic relationship with denitrifying bacteria. Moreover, lower NH4+-N concentration resulted in greater influence of C/N ratio on anammox performance than COD concentration, while the opposite was true at high NH4+-N concentration. This study verified that anammox immobilized filler is effective for mainstream applications.
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Affiliation(s)
- XiaoTong Wang
- Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, College of Architectural Engineering, Beijing University of Technology, Beijing 100124, China
| | - Hong Yang
- Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, College of Architectural Engineering, Beijing University of Technology, Beijing 100124, China; Beijing General Municipal Engineering Design & Research Institute Co., Ltd, Beijing 100044, China.
| | - YaKun Zhou
- Beijing General Municipal Engineering Design & Research Institute Co., Ltd, Beijing 100044, China
| | - XuYan Liu
- Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, College of Architectural Engineering, Beijing University of Technology, Beijing 100124, China
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8
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Bishayee B, Chatterjee RP, Ruj B, Chakrabortty S, Nayak J. Strategic management of nitrate pollution from contaminated water using viable adsorbents: An economic assessment-based review with possible policy suggestions. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 303:114081. [PMID: 34823908 DOI: 10.1016/j.jenvman.2021.114081] [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: 07/28/2021] [Revised: 10/22/2021] [Accepted: 11/07/2021] [Indexed: 06/13/2023]
Abstract
Groundwater contaminated with nitrate has prompted a flurry of research studies around the world in the recent years to address this burning environmental issue. The common presence of nitrates in groundwater, wastewater, and surface waters has thrown an enormously critical challenge to the global research communities to provide safe and clean drinking water to municipalities. As per WHO, the maximum permissible limit of nitrate in drinking water is 10 mg/L and in groundwater is 50 mg/L; exceeding the limits, several human health problems are observed. Adsorption, ion-exchange processes, membrane-based approaches, electrochemical and chemical procedures, biological methods, filtration, nanoparticles, etc. have been well investigated and reviewed to reduce nitrate levels in water samples in the recent years. Process conditions, as well as the efficacy of various approaches, were discovered to influence different techniques for nitrate mitigation. But, because of low cost, simple operation, easy handling, and high removal effectiveness, adsorption has been found to be the most suitable and efficient approach. The main objectives of this review primarily focuses on the creation of a naturally abundant, cost-effective innovative abundant material, such as activated clay particles combined with iron oxide. Oxide-clay nanocomposite materials, effectively remove nitrate with higher removal efficiency along with recovery of nitrate concentrated sludge. Such methods stand out as flexible and economic ways for capturing stabilized nitrate in solid matrices to satisfy long-term operations. A techno-economic assessment along with suitable policy suggestions have been reported to justify the viability of the brighter processes. Indeed, this kind of analytical review appears ideal for municipal community recommendations on abatement of excess nitrate to supply of clean water.
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Affiliation(s)
- Bhaskar Bishayee
- Environmental Engineering Group, CSIR-Central Mechanical Engineering Research Institute, Durgapur, 713209, India
| | - Rishya Prava Chatterjee
- Environmental Engineering Group, CSIR-Central Mechanical Engineering Research Institute, Durgapur, 713209, India
| | - Biswajit Ruj
- Environmental Engineering Group, CSIR-Central Mechanical Engineering Research Institute, Durgapur, 713209, India.
| | - Sankha Chakrabortty
- School of Chemical Technology, Kalinga Institute of Industrial Technology, Bhubaneswar, Odisha, 751024, India.
| | - Jayato Nayak
- Department of Chemical Engineering, Kalasalingam Academy of Research and Education, Tamilnadu, 626126, India.
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9
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Hou W, Wang S, Li Y, Hao Z, Zhang Y, Kong F. Influence of modified biochar supported Fe-Cu/polyvinylpyrrolidone on nitrate removal and high selectivity towards nitrogen in constructed wetlands. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 289:117812. [PMID: 34333269 DOI: 10.1016/j.envpol.2021.117812] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 07/05/2021] [Accepted: 07/17/2021] [Indexed: 06/13/2023]
Abstract
In this study, the biochar (BC) supported Fe-Cu bimetallic stabilized by PVP (Fe-Cu/PVP/BC) were prepared and utilized to enhance the nitrate (NO3-) removal and the selectivity toward nitrogen (N2). Results showed the optimum Fe:Cu:BC ratio and the dosage of the BC (pyrolysis at 700 °C) supported Fe-Cu bimetallic stabilized by polyvinylpyrrolidone (PVP) (Fe-Cu/PVP/BC700) were respectively 1:2:3 and 1 mg L-1 with the selectivity toward N2 of 31 %. This was mainly due to the synergy among Fe0, Cu0 and BC in the Fe-Cu/PVP/BC. The addition of Fe0 could reduce the NO3- through providing electron. The Cu0 and BC improved the selectivity of NO3- to N2 through forming [Cu-NO2-ads] and adjusting redox potential. The addition of Fe-Cu/PVP/BC could supply electrons for denitrification and enhance the relative abundances of Azospira and Thauera related to denitrification to improve NO3- removal. This result was further confirmed by the variations of denitrifying functional genes (narG, nirK, nirS and nosZ). This research provided an effective method to improve NO3- removal during surface water treatment in constructed wetlands (CWs) by adding Fe-Cu/PVP/BC.
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Affiliation(s)
- Weihao Hou
- College of Environmental Science and Engineering, Qingdao University, Qingdao, China
| | - Sen Wang
- College of Environmental Science and Engineering, Qingdao University, Qingdao, China
| | - Yue Li
- College of Environmental Science and Engineering, Qingdao University, Qingdao, China
| | - Ziran Hao
- College of Environmental Science and Engineering, Qingdao University, Qingdao, China
| | - Yi Zhang
- College of Environmental Science and Engineering, Qingdao University, Qingdao, China
| | - Fanlong Kong
- College of Environmental Science and Engineering, Qingdao University, Qingdao, China.
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10
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Zhang F, Peng Y, Liu Z, Liu Y, Zhao L. Development of a novel partial nitrification, fermentation-based double denitrification bioprocess (PN-F-Double/DN) to simultaneous treatment of mature landfill leachate and waste activated sludge. WATER RESEARCH 2021; 203:117540. [PMID: 34412016 DOI: 10.1016/j.watres.2021.117540] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 08/04/2021] [Accepted: 08/05/2021] [Indexed: 06/13/2023]
Abstract
Introducing fermentation technology into sewage treatment is a sustainable development concept, but future application still faces many challenges. A novel partial nitrification, fermentation-based double denitrification bioprocess (PN-F-Double/DN) was achieved in three separated SBR type reactors, simultaneously treating high ammonia (1766.6 mg/L) mature landfill leachate and external waste activated sludge (WAS, MLSS = 20.6 g/L). Firstly, NH4+-N was oxidized to NO2--N in partial nitrification reactor (PN-SBR), with nitrite accumulation ratio (NAR) of 96.5%. Next, the PN-SBR effluent (NO2--N = 1529.8 mg/L) coupled with the WAS were introduced to an anoxic reactor for integrated fermentation-denitrification (IFD-SBR). The occurrence of fermentation was mainly attributed to free nitrous acid (FNA, nitrite protonate form) promoting the splitting decomposition of sludge spatial configuration and interfacial forces. The released volatile fatty acids (VFAs) were utilized in situ during the denitrification process (NO2--N→N2), obtaining 0.6 kg/m3•d nitrogen removal rate and 3.3 kg/m3•d sludge reduction rate. Finally, undesirable fermentation by-products from IFD-SBR (NH4+-N = 119.2 mg/L) were further removed in the endogenous post-denitrification reactor (EPD-SBR) through operational strategy of anaerobic/aerobic/anoxic by residual VFAs as the carbon source. In the EPD-SBR, Defluviicoccus (0.9%) and Candidatus Competibacter (5.8%) dominated carbon source storage and nitrogen removal, acting as a typical denitrifying glycogen-accumulating organism (DGAO), with an intracellular carbon storage efficiency of 83.1% and nitrogen removal contribution of 93.7%. After 200 days of operation, the PN-F-Double/DN process provided effluent containing, on average, 1.86 mg/L NH4+-N and 5.5 mg/L NOx--N, with 98.5% TN removal. Compared with traditional bioprocesses, PN-F-Double/DN allowed up to 25% saving in aeration energy consumption, 100% decrease in carbon source demand, and achieve 46.1% external WAS reduction.
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Affiliation(s)
- Fangzhai Zhang
- China Architecture Design and Research Group, Beijing 100044, PR China; National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China
| | - Yongzhen Peng
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China
| | - Zihui Liu
- Library, Beijing University of Civil Engineering and Architecture, Beijing 100044, PR China
| | - Yongwang Liu
- China Architecture Design and Research Group, Beijing 100044, PR China
| | - Li Zhao
- China Architecture Design and Research Group, Beijing 100044, PR China.
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11
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Wang H, Chen N, Feng C, Deng Y. Insights into heterotrophic denitrification diversity in wastewater treatment systems: Progress and future prospects based on different carbon sources. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 780:146521. [PMID: 34030330 DOI: 10.1016/j.scitotenv.2021.146521] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 03/03/2021] [Accepted: 03/11/2021] [Indexed: 06/12/2023]
Abstract
Nitrate, as the most stable form of nitrogen pollution, widely exists in aquatic environment, which has great potential threat to ecological environment and human health. Heterotrophic denitrification, as the most economical and effective method to treat nitrate wastewater, has been widely and deeply studied. From the perspective of heterotrophic denitrification, this review discusses nitrate removal in the aquatic environment, and the behaviors of different carbon source types were classified and summarized to explain the cyclical evolution of carbon and nitrogen in global biochemical processes. In addition, the denitrification process, electron transfer as well as denitrifying and hydrolyzing microorganisms among different carbon sources were analyzed and compared, and the commonness and characteristics of the denitrification process with various carbon sources were revealed. This study provides theoretical support and technical guidance for further improvement of denitrification technologies.
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Affiliation(s)
- Haishuang Wang
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, China
| | - Nan Chen
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, China.
| | - Chuanping Feng
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, China
| | - Yang Deng
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, China
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12
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Zhang W, Shen J, Zhang H, Zheng C, Wei R, Gao Y, Yang L. Efficient nitrate removal by Pseudomonas mendocina GL6 immobilized on biochar. BIORESOURCE TECHNOLOGY 2021; 320:124324. [PMID: 33147528 DOI: 10.1016/j.biortech.2020.124324] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/17/2020] [Accepted: 10/23/2020] [Indexed: 05/22/2023]
Abstract
The performance of nitrate removal by Pseudomonas mendocina GL6 cells immobilized on bamboo biochar was investigated. The results showed that immobilized bacterial cells performed better nitrate removal than the free bacterial cells, and the nitrate removal rate increased from 6.51 mg/(L·h) of free cells to 8.34 mg/(L·h) of immobilized cells. The nitrate removal of immobilized bacterial cells fitted well to the zero-order kinetics model. Moreover, bath experiments showed that immobilized bacterial cells displayed more nitrate removal capacity under different conditions than free bacterial cells due to the protection of biochar carrier. The subsequent mechanistic study suggested that biochar promoted the expression level of denitrification functional genes (napA and nirK) and electron transfer genes involved in denitrification (napB and napC), which resulted in the increase of nitrate removal efficiency. Thus, biochar-immobilized P. mendocina GL6 has much potential to remove nitrate from wastewater via aerobic denitrification.
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Affiliation(s)
- Wen Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Jianing Shen
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Huifen Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Chaoqun Zheng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Ruping Wei
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Yan Gao
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Liuyan Yang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China.
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13
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Effect of Denitrifying Bacterial Biomass and Carbon Sources on Nitrate Removal. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2020. [DOI: 10.22207/jpam.14.4.19] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Denitrification based on immobilized microbial cellulose may offer an economical replacement for conventional treatment for nitrate removal. The environmental and bacterial biomass may influence the rate of biological denitrification processes. This study aimed to investigate the factors that affect denitrification rates, including carbon sources, pH, and bacterial inoculum. Different inoculum biomass of Pseudomonas aeruginosa and various carbon sources of glucose, sucrose, and cellulose with different concentrations were tested to assimilate 100 mg/L of KNO3 as nitrate source. Additionally, five additional inoculations, five different incubation time, and seven different pH levels were studied. The Pseudomonas aeruginosa isolates used different mineral media with three carbon sources, glucose, sucrose, and cellulose, with different concentrations at different rates to denitrify nitrate. The highest denitrification rate was with glucose after 18 hrs and was after 24 hrs when sucrose and cellulose were used, respectively. The bacterial biomass denitrification level was the highest, between 0.8% and 1% of OD600=1. Nitrate removal by Pseudomonas aeruginosa was the highest at pH 7, 8, and 9. This report suggests that when glucose is used as a carbon source, at neutral to alkaline pH, and 1% of denitrifying bacterial biomass, the highest level of biological denitrification process may be achieved.
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14
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Lan Z, Yang J, Feng L, Yu H, Ye X, Yang G, Gao H, Zhou J. Comparative analysis of denitrification performance, denitrifying community and functional genes to oxytetracycline exposure between single and hybrid biodegradable polymers supported solid-phase denitrification systems. Biodegradation 2020; 31:289-301. [PMID: 32920674 DOI: 10.1007/s10532-020-09910-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Accepted: 09/05/2020] [Indexed: 02/07/2023]
Abstract
Biodegradable carrier are vital for the solid-phase denitrification (SPD) systems for treating nitrate-rich water. Two solid-phase denitrification reactors were developed with both 200 g L-1 of single (polycaprolactone, PCL) (R1) and hybrid solid carbon sources (PCL/polylactic acid (PLA) /polyhydroxyalkanoates (PHA)) (R2) to examine the denitrification performance, denitrifying community and functional genes to various oxytetracycline (OTC) exposure in this study, respectively. Complete denitrification performance was achieved in the both SPD systems at low stress of OTC (1 mg L-1), but then dramatically reduced to less than 20% of nitrate reduction efficiency after one-month high OTC stress (10 mg L-1), and rapidly recovered to stable nitrate removal rates of 76.77 ± 5.48% (R1) and 40.68 ± 4.40% (R2) after the next day of no OTC stress. However, the reactor R1 with single PCL carriers acquired more efficient nitrate removal rate than that of reactor R2 at the high OTC stress and recovery phase with OTC stress, mainly due to the more organics availability from the single PCL carriers. The richness and diversity of nirK and nirS deintrifiers significantly declined at high OTC stress, and much more of those occurred in biofilm R1 with more organics availability. Besides, biofilm R1 achieved much more abundant periplasmic nitrate reductase, nitrite reductase genes and tetracycline resistance genes after high OTC stress, which explained the potential resistance to OTC and rapid recovery efficiency after no stress of OTC. Thus, the organics availability played an important role in assuring SPD system to be efficient under high OTC stress.
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Affiliation(s)
- Zeyu Lan
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Jingyi Yang
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Lijuan Feng
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China.
| | - Hui Yu
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Xin Ye
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Guangfeng Yang
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Huiming Gao
- Department of Environment Science and Engineering, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Jiaheng Zhou
- College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, 310014, People's Republic of China
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15
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Si Z, Song X, Wang Y, Cao X, Wang Y, Zhao Y, Ge X, Sand W. Untangling the nitrate removal pathways for a constructed wetland- sponge iron coupled system and the impacts of sponge iron on a wetland ecosystem. JOURNAL OF HAZARDOUS MATERIALS 2020; 393:122407. [PMID: 32135362 DOI: 10.1016/j.jhazmat.2020.122407] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 02/22/2020] [Accepted: 02/24/2020] [Indexed: 06/10/2023]
Abstract
Sponge iron (s-Fe0) is a potential alternative electron donor for nitrate reduction. To gain insight into the mechanism of denitrification in a constructed wetland- sponge iron coupled system (CW-Fe0 system), the removal performance and reduction characteristics of nitrate in constructed wetlands (CWs) with and without s-Fe0 application were compared. Results indicated that s-Fe0 intensified the removal of nitrate with a 6h-HRT. The nitrate removal efficiency was improved by 16-76 % with various influent NO3--N concentrations (10-30 mg L-1) and at a chemical oxygen demand(COD)/N ratio of 5. The rates of chemical denitrification were positively correlated with the dosage of s-Fe0 and negatively correlated with the influent COD concentration. 16S rDNA sequencing revealed that hydrogen-utilizing autotrophic denitrifier of Hydrogenophaga was highly enriched (accounting for 10 % of the total OTUs) only in CW-Fe0 system. The micro-environment created by s-Fe0 was suitable for heterotrophic denitrifiers of Thauera, Tessaracoccus and Simplicispira. The determination of physiological indicators for plants showed that the application of s-Fe0 causes abiotic stress to wetland plants (Canna indica L.). Nevertheless, s-Fe0 can be used as a substrate for CWs, since it allows a high-efficiency removal of nitrate by mediating chemical denitrification and hydrogen-driven autotrophic denitrification.
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Affiliation(s)
- Zhihao Si
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China
| | - Xinshan Song
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China.
| | - Yuhui Wang
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China
| | - Xin Cao
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China
| | - Yifei Wang
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China
| | - Yufeng Zhao
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China
| | - Xiaoyan Ge
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China
| | - Wolfgang Sand
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China
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16
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Wang Y, Lu X, Fan P, Huang X, Li B, Wang W, Zhao J. Effects of different dosing modes of calcium nitrate on P locking in sediment and nutrient concentrations in waters. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:7504-7514. [PMID: 31884534 DOI: 10.1007/s11356-019-07382-2] [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: 08/20/2019] [Accepted: 12/10/2019] [Indexed: 06/10/2023]
Abstract
Sediment is an endogenous pollution source, which often leads water systems to eutrophication due to the release of nutrients, especially phosphorus (P). Calcium nitrate (CN) was dosed to the water systems under different modes to control P release from the sediments in this study. A 63-day static laboratory test was conducted to explore the effects of intermittent dosing and one-time dosing modes of CN on P locking in the sediment and the concentrations of nitrogen (N) and P in waters. Results showed that 89% total phosphorus (TP) in the overlying water and 91% TP in the interstitial water of sediment were reduced in the intermittent dosing reactor, which were 4% and 13% higher than those in the one-time dosing reactor, respectively. Thus, the concentration of TP in the overlying water of the dosing reactors was both below 0.1 mg/L during the whole experiment. Meanwhile, the mean values of oxidation-reduction potential (ORP) in the sediment increased to - 110.7 ± 42.02 mV when CN was added intermittently, which were significantly higher than those of the one-time dosing reactor (- 158.3 ± 44.61 mV) and control reactor (- 320.7 ± 0.05 mV). Compared with one-time dosing mode, the intermittent dosing not only reduced the maximum concentrations of NO2--N from 9.21 to 1.79 mg/L and NO3--N from 92.42 to 27.58 mg/L but also shorten their retention time in the overlying water, which might depress the toxic threats to aquatic animals in water environments. Therefore, the intermittent dosing of CN could not only improve the P locking effect but also minimize the risks to aquatic animals in water environments under the premise of reasonable dosage selected. In a word, this research provided an effective operation mode for locking P with CN in the heavily polluted water bodies, which is also advantageous to avoid toxic threats to aquatic animals in water environment.
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Affiliation(s)
- Yi Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No.13 Yanta Road, Beilin District, Xi'an, 710055, Shaanxi, China.
| | - Xinxin Lu
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No.13 Yanta Road, Beilin District, Xi'an, 710055, Shaanxi, China
| | - Pan Fan
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No.13 Yanta Road, Beilin District, Xi'an, 710055, Shaanxi, China
| | - Xiaozhong Huang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No.13 Yanta Road, Beilin District, Xi'an, 710055, Shaanxi, China
| | - Binjuan Li
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No.13 Yanta Road, Beilin District, Xi'an, 710055, Shaanxi, China
| | - Wenhuai Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No.13 Yanta Road, Beilin District, Xi'an, 710055, Shaanxi, China
| | - Jingchan Zhao
- College of Chemistry &Materials Science, Northwest University, Xi'an, 710069, China
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17
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Schroeder A, Souza DH, Fernandes M, Rodrigues EB, Trevisan V, Skoronski E. Application of glycerol as carbon source for continuous drinking water denitrification using microorganism from natural biomass. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 256:109964. [PMID: 31989983 DOI: 10.1016/j.jenvman.2019.109964] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 12/04/2019] [Accepted: 12/04/2019] [Indexed: 06/10/2023]
Abstract
The contamination of water resources by nitrate is a global problem. Indeed, traditional treatment technologies are not able to remove this ion from water. Alternatively, biological denitrification is a useful technique for natural water nitrate removal. This study aimed to evaluate the use of glycerol as a carbon source for drinking water nitrate removal via denitrification in a reactor using microorganisms from natural biomass. The experiment was carried out in a continuous fixed bed reactor using immobilised microorganisms from the vegetal Phyllostachys aurea. The tests were started in batch mode to provide cells growth and further immobilisation on the support. Then, the treatment experiments were accomplished in an up-flow continuous reactor. Ethanol was used as the primary carbon source, and it was gradually replaced by glycerol. The C:N (carbon to nitrogen) ratio and the hydraulic residence time (HRT) were evaluated. It was possible to remove 98.14% of nitrate using a C:N ratio and HRT of 3:1 and 1.51 days, respectively. The results have demonstrated that glycerol is a potential carbon source for denitrification in a continuous reactor using immobilised cells from natural biomass.
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Affiliation(s)
- Aline Schroeder
- Laboratory for Water and Waste Treatment, Environmental and Sanitary Engineering Department, Santa Catarina State University, Lages, Santa Catarina, 88520-000, Brazil
| | - Diego H Souza
- Laboratory for Water and Waste Treatment, Environmental and Sanitary Engineering Department, Santa Catarina State University, Lages, Santa Catarina, 88520-000, Brazil
| | - Mylena Fernandes
- Biological Engineering Integrated Laboratory, Chemical and Food Engineering Department, Federal University of Santa Catarina, Campus Universitário Trindade, Florianópolis, Santa Catarina, 88040-900, Brazil
| | - Eduardo B Rodrigues
- Laboratory for Water and Waste Treatment, Environmental and Sanitary Engineering Department, Santa Catarina State University, Lages, Santa Catarina, 88520-000, Brazil
| | - Viviane Trevisan
- Laboratory for Water and Waste Treatment, Environmental and Sanitary Engineering Department, Santa Catarina State University, Lages, Santa Catarina, 88520-000, Brazil
| | - Everton Skoronski
- Laboratory for Water and Waste Treatment, Environmental and Sanitary Engineering Department, Santa Catarina State University, Lages, Santa Catarina, 88520-000, Brazil.
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18
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Boroumand Y, Razmjou A, Moazzam P, Mohagheghian F, Eshaghi G, Etemadifar Z, Asadnia M, Shafiei R. Mussel inspired bacterial denitrification of water using fractal patterns of polydopamine. JOURNAL OF WATER PROCESS ENGINEERING 2020; 33:101105. [DOI: 10.1016/j.jwpe.2019.101105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/30/2023]
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19
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Huq ME, Fahad S, Shao Z, Sarven MS, Al-Huqail AA, Siddiqui MH, Habib Ur Rahman M, Khan IA, Alam M, Saeed M, Rauf A, Basir A, Jamal Y, Khan SU. High arsenic contamination and presence of other trace metals in drinking water of Kushtia district, Bangladesh. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 242:199-209. [PMID: 31039529 DOI: 10.1016/j.jenvman.2019.04.086] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 04/07/2019] [Accepted: 04/22/2019] [Indexed: 06/09/2023]
Abstract
Drinking water with excessive concentration levels of arsenic (As) is a great threat to human health. A hydrochemical approach was employed in 50 drinking water samples (collected from Kushtia district, Bangladesh) to examine the occurrence of geogenic As and the presence of trace metals (TMs), as well as the factors controlling As release in aquifers. The results reveal that the drinking water of shallow aquifers is highly contaminated by As (6.05-590.7 μg/L); 82% of samples were found to exceed the WHO recommended limit (10 μg/L) for potable water, but the concentrations of Si, B, Mn, Sr, Se, Ba, Fe, Cd, Pb, F, U, Ni, Li, and Cr were within safe limits. The Ca-HCO3-type drinking water was identified as having high contents of As, pH and HCO3-, a medium-high content EC, and low concentrations of NO3-, SO42-, K+, and Cl-. The significant correlation between As and NO3- indicates that NO3- might be attributed to the use of phosphate fertilizers and a factor responsible for enhancing As in aquifers. The study also reports that the occurrence of high As and the presence of TMs in drinking water may be a result of local anthropogenic activities, such as irrigation, intensive land use and the application of agrochemicals. The insignificant correlation between As and SO42- demonstrated that As is released from SO42- minerals under reducing conditions. An elevated pH value along with decoupling of As and HCO3- plays a vital role in mobilizing As to aquifer systems. Moreover, the positive relationship between As and Si indicated that As is transported in the biogeochemical environment. The reductive suspension of Mn(IV)-oxyhydroxides also accelerated the As mobilization process. Over exploitation of tube-well water and the competitive ion exchange process are also responsible for the release of As in aquifers.
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Affiliation(s)
- Md Enamul Huq
- State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, 129 Luoyu Road, Wuhan, 430079, Hubei, China
| | - Shah Fahad
- Department of Agriculture, University of Swabi, Khyber Pakhtunkhwa, Pakistan; College of Plant Science and Technology, Huazhong Agricultural University, No. 1 Shizishan Street, Wuhan, 430070, Hubei, China.
| | - Zhenfeng Shao
- State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, 129 Luoyu Road, Wuhan, 430079, Hubei, China.
| | - Most Sinthia Sarven
- College of Plant Science and Technology, Huazhong Agricultural University, No. 1 Shizishan Street, Wuhan, 430070, Hubei, China
| | - Asma A Al-Huqail
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Manzer H Siddiqui
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Muhammad Habib Ur Rahman
- Department of Agronomy, Muhammad Nawaz Shareef University of Agriculture, Multan, Punjab, Pakistan
| | - Imtiaz Ali Khan
- Department of Agriculture, University of Swabi, Khyber Pakhtunkhwa, Pakistan
| | - Mukhtar Alam
- Department of Agriculture, University of Swabi, Khyber Pakhtunkhwa, Pakistan
| | - Muhammad Saeed
- Department of Agriculture, University of Swabi, Khyber Pakhtunkhwa, Pakistan
| | - Abdur Rauf
- Department of Agriculture, University of Swabi, Khyber Pakhtunkhwa, Pakistan
| | - Abdul Basir
- Department of Agriculture, University of Swabi, Khyber Pakhtunkhwa, Pakistan
| | - Yousaf Jamal
- Department of Agriculture, University of Swabi, Khyber Pakhtunkhwa, Pakistan
| | - Shahid Ullah Khan
- College of Plant Sciences and Technology/National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China
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20
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Gan Y, Zhao Q, Ye Z. Denitrification performance and microbial diversity of immobilized bacterial consortium treating nitrate micro-polluted water. BIORESOURCE TECHNOLOGY 2019; 281:351-358. [PMID: 30831514 DOI: 10.1016/j.biortech.2019.02.111] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 02/21/2019] [Accepted: 02/23/2019] [Indexed: 06/09/2023]
Abstract
A heterotrophic denitrification process using bacterial consortium immobilized by polyurethane foams carriers to treat nitrate micro-polluted water was investigated. Nitrate reduction and nitrite accumulation were studied under several factors including initial COD/NO3--N concentration ratio, initial pH, initial NO2--N/NO3--N concentration ratio and inlet NO3--N concentration. Batch denitrification experiments showed that nitrate was completely removed at 5 h without nitrite accumulation under the optimum conditions of COD/NO3--N concentration ratio of 5.0-5.5 and initial pH of 7.2 ± 0.1. High initial NO2--N/NO3--N ratio enhanced denitrification rate mainly by accelerating nitrite reduction. Denitrification processes followed zero-order reaction kinetics at different initial NO3--N concentrations and obtained higher denitrification rate at higher inlet nitrate. High-throughput sequencing results showed that microbial community structure differed between the surface and interior space of polyurethane foams carriers while the dominant population in the inner zone of carriers was Pseudoxanthomonas.
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Affiliation(s)
- Yalan Gan
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Quanlin Zhao
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Zhengfang Ye
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
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21
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Zhu N, Wu Y, Tang J, Duan P, Yao L, Rene ER, Wong PK, An T, Dionysiou DD. A New Concept of Promoting Nitrate Reduction in Surface Waters: Simultaneous Supplement of Denitrifiers, Electron Donor Pool, and Electron Mediators. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:8617-8626. [PMID: 29966090 DOI: 10.1021/acs.est.8b01605] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The efficiency of biological nitrate reduction depends on the community composition of microorganisms, the electron donor pool, and the electron mediators participating in the biological reduction process. This study aims at creating an in situ system comprising of denitrifiers, electron donors, and electron mediators to reduce nitrate in surface waters. The ubiquitous periphytic biofilm in waters was employed to promote in situ nitrate reduction in the presence of titanium dioxide (TiO2) nanoparticles (NPs). The nitrate removal rate in the periphytic biofilm and TiO2 NPs system was significantly higher than the control (only periphytic biofilm or TiO2 NPs). TiO2 NPs optimized the community composition of periphytic biofilm for nitrate reduction by increasing the relative abundance of four dominant denitrifying bacteria. Periphytic biofilm showed a substantial increase in extracellular polymeric substance, especially the humic acid and protein content, due to the presence of TiO2 NPs. The synergistic action of humic acid, protein, denitrifying bacteria of the periphytic biofilm, and TiO2 NPs contributed to 80% of the nitrate reduction. The protein and humic acid, acting as electron mediators, facilitated the transfer of exogenous electrons from photoexcited TiO2 NPs to periphytic biofilm containing denitrifiers, which enhanced nitrate reduction in surface waters.
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Affiliation(s)
- Ningyuan Zhu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Sciences , Chinese Academy of Sciences , 71 East Beijing Road , Nanjing 210008 , China
- College of Resource and Environment , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Yonghong Wu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Sciences , Chinese Academy of Sciences , 71 East Beijing Road , Nanjing 210008 , China
| | - Jun Tang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Sciences , Chinese Academy of Sciences , 71 East Beijing Road , Nanjing 210008 , China
- College of Resource and Environment , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Pengfei Duan
- Collaborative Innovation Center of Water Security for Water Source, Region of Mid-line of South-to-North Diversion Project , Nanyang Normal University , Nanyang 473061 , Henan , China
| | - Lunguang Yao
- Collaborative Innovation Center of Water Security for Water Source, Region of Mid-line of South-to-North Diversion Project , Nanyang Normal University , Nanyang 473061 , Henan , China
| | - Eldon R Rene
- Department of Environmental Engineering and Water Technology , IHE Delft Institute for Water Education , Westvest 7 , 2611 AX Delft , The Netherlands
| | - Po Keung Wong
- School of Life Sciences , The Chinese University of Hong Kong , Shatin, NT, Hong Kong , SAR , China
| | - Taicheng An
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control , Guangdong University of Technology , Guangzhou , 510006 , China
| | - Dionysios D Dionysiou
- Department of Chemical and Environmental Engineering (ChEE), 705 Engineering Research Center , University of Cincinnati , Cincinnati , Ohio 45221-0012 , United States
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