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| Generation of disinfection by-products during high-dose sodium hypochlorite disinfection of swine wastewater |
| Received:September 27, 2022 |
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| KeyWord:swine wastewater|sodium hypochlorite disinfection|disinfection by-products|comprehensive two-dimensional gas chromatography-quadrupole mass spectrometry（GC×GC-qMS） |
| Author Name | Affiliation | E-mail | | WANG Enquan | State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
University of Chinese Academy of Sciences, Beijing 100049, China
Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | | | XU Xiong | Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sci-ences, Beijing 100085, China | | | SUI Qianwen | State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | qwsui@rcees.ac.cn | | ZHENG Rui | Anping Hongjia Environmental Protection Technology Co., Ltd., Hengshui 053600, China | | | CHEN Meixue | State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | mxchen@rcees.ac.cn | | LIU Quanzhen | Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sci-ences, Beijing 100085, China | | | ZHANG Qianru | Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | WEI Yuansong | State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
University of Chinese Academy of Sciences, Beijing 100049, China
Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | |
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| Abstract: |
| In order to clarify how disinfection by-products（DBPs）were produced during disinfection, in this study, the samples were collected from the effluent of different treatment units in a typical swine wastewater treatment plant, which comprised of anaerobic digestion and an improved A2O process. The comprehensive two-dimensional gas chromatography-quadrupole mass spectrometry（GC×GC-qMS） combined with three-dimensional fluorescence（3D-EEM）was applied to analyze the effect of organic compounds on DBPs generation. A total of 38 DBPs in 10 categories were found with a high concentration of chloro-phenols and chloro-heterocyclic DBPs observed in disinfected raw swine wastewater. Anaerobic digestion and the improved A2O process eliminated the majority of the DBP precursors. After anaerobic digestion, chloro-phenols and chloro-heterocyclic DBPs were reduced by 88.50% and 77.64%, respectively. However, an increase in the concentration of esters and hydrocarbons after anaerobic digestion, increased the production of chloro-esters and chlorohydrocarbons by 392.18% and 68.37%, respectively. Improved A2O process could remove certain precursors of chloro-esters. The increase in C/N ratio, decrease in H/C ratio, and increase in HIX of organic compounds indicated the enhancement of humification degree, stability degree, and aromaticity in the effluent of improved A2O. It would partly explain the increase in chloro-hydrocarbons DBPs after disinfection. Anaerobic digestion and improved A2O process removed relatively little of the precursors of chloro-esters and chlorohydrocarbons; thus, the swine wastewater treatment system needs to strengthen its removal capacity. |
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