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Full-scale application and performance of a new multi-self-reflow decentralized Wastewater treatment device: Impact of hydraulic and pollutant loads

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Journal of Environmental Sciences 2023年第9期131卷 37-47页

作者： Xiang Li Yong Huang Yi Guo Wei Li Yuqing Li School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou 215009China Suzhou SuJing Environmental Engineering Company Jiangsu Suzhou Purification Group Technology CompanySuzhou 215009China

Decentralized treatment of wastewater in rural areas usually has several challenges,which include large fluctuations in pollutant concentration and water quantity,complicated operation and maintenance of conventional biochemical treatment equipment,resulting in poor stability and a low compliance rate of the wastewater treatment *** order to solve the above problems,a new integration reactor is designed,which uses gravity and aeration tail gas self-reflux technology to realize the reflux of sludge and the nitrification liquid,*** feasibility and operation characteristics of its application for decentralized wastewater treatment in rural areas are *** results demonstrated that,under constant influent,the device showed strong tolerance to the shock of pollutant *** chemical oxygen demand,NH_(4)^(+)-N,total nitrogen and total phosphorus fluctuated in the ranges of 95–715 mg/L,7.6–38.5 mg/L,9.32–40.3 mg/L and 0.84–4.9 mg/L,*** corresponding effluent compliance rates were 82.1%,92.8%,96.4%and 96.3%,*** the wastewater discharge was non-constant and the maximum single-day Qmax/Qmin reached 5,all indicators of the effluent met the relevant discharge *** integrated device also demonstrated high phosphorus enrichment levels in its anaerobic zone;the concentration of phosphorus reached a maximum of 26.9 mg/L,which created a good environment for phosphorus *** microbial community analysis showed that sludge digestion,denitrification,and phosphorus-accumulating bacteria all played an important role in pollutant treatment.

关键词： Decentralized wastewater treatment Integrated device Self-reflux technology load shock Operational characteristics

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