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Bioelectrochemical sulfate reduction enhanced nitrogen removal from industrial wastewater containing ammonia and sulfate |
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| Authors: | Jiaqi Ren Gaoming Wu Zheng Xia Mingming Wang Jun Wei Bin Yang Yang Hou Lecheng Lei Di Wu Zhongjian Li |
| Affiliation: | 1. College of Chemical and Biological Engineering, Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China
Contribution: Formal analysis, ?Investigation, Resources, Writing - original draft;2. College of Chemical and Biological Engineering, Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China Institute of Zhejiang University – Quzhou, Quzhou, China Contribution: Data curation, Funding acquisition, ?Investigation, Validation, Writing - original draft;3. Zhejiang Environmental Monitoring Center, Hangzhou, China Contribution: Data curation, Methodology;4. Power China Huadong Engineering Corporation Limited, Hangzhou, China Contribution: Methodology, Resources, Validation;5. Power China Huadong Engineering Corporation Limited, Hangzhou, China Contribution: Resources;6. College of Chemical and Biological Engineering, Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China Institute of Zhejiang University – Quzhou, Quzhou, China Contribution: Methodology, Resources, Validation;7. College of Chemical and Biological Engineering, Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China Institute of Zhejiang University – Quzhou, Quzhou, China Contribution: Formal analysis, ?Investigation, Validation;8. College of Chemical and Biological Engineering, Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China Institute of Zhejiang University – Quzhou, Quzhou, China Contribution: Supervision;9. Department of Civil and Environmental Engineering, Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution (Hong Kong Branch) and Water Technology Center, The Hong Kong University of Science and Technology, Hong Kong, China Contribution: ?Investigation, Methodology, Writing - review & editing;10. College of Chemical and Biological Engineering, Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China |
| Abstract: | Low organic carbon-to-nitrogen ratio and existing sulfate (SO42?) in industrial wastewater limited nitrogen removal. Coupling SO42? reduction with sulfide autotrophic denitrification provides a novel strategy. Herein, bioelectrochemical sulfate reduction was coupled with heterotrophic sulfate reduction to drive sulfide autotrophic denitrification. In this coupled system, total nitrogen (TN) removal efficiency was increased from ~25% to ~85% by inputting ?45 mA electricity. With the help of supplying electrons to denitrification through SO42? reduction, coulomb efficiency was improved to 61.5%. Also, bioelectrochemical sulfate reduction could improve sulfur recovery and thus increase TN removal efficiency. Furthermore, through tuning turnover numbers of SO42?, high TN removal efficiency can be obtained at various concentrations of SO42?. Moreover, main functional bacteria in this system were identified. Finally, ~75% TN removal efficiency was achieved with real wastewater in this system. Overall, this work offered a new approach for efficient nitrogen removal from industrial wastewater containing SO42?. |
| Keywords: | biocathode bioelectrochemical system nitrogen removal sulfate-reducing bacteria sulfide autotrophic denitrification |