Operation strategies of nitrogen and phosphorus removal system for campus sewage and its influence on the performance of activated sludge
ZHAO Wenzhao1,2,, PEI Hao1,2, WANG Chao1,2, AO Qiang1,2, LYU Kai1,2, PENG Dangcong1,2,, 1.School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 2.Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi'an 710055, China
Abstract:Campus sewage is characterized as large change in water volume, unstable water quality and pollutant loading. It is a key for the operation of campus sewage treatment system to maintain the sewage treatment system operating in a normal and stable way. In the study, the intermittent A2/O process of a university campus sewage treatment station in Xi'an was taken as the target, and the increase of the anaerobic-aerobic time ratio under low pollutant loading was proposed as the operation strategy in order to decline the decay of nitrifying bacteria and accelerate the restart of treatment process in summer holiday. The results show that the influent of the sewage treatment station during the holiday period was only 5%~10% of the normal treatment period, and the sludge concentration decreased from 4 500 mg·L?1 before the holiday to 3 200 mg·L?1 after the holiday (42 d), only decayed by 29%. The corresponding sludge activities of phosphorus release and absorption declined by 77% and 85.7%, respectively, while the activities of AOB and NOB presented smaller decays with 64% and 34%, respectively. FISH measurement showed that the community structure analysis corresponded to the change in activities. The strategy in summer holiday allowed the functional microorganisms in the sludge to maintain a lower decay rate under anaerobic conditions, the nitrifying bacteria had a lower decay rate than PAOs, which was more conducive to the rapid restart of the activated sludge system after holiday. The results of the study can be used as a technical reference for the holiday operation strategy of the university campus wastewater treatment station. Key words:activated sludge/ campus sewage/ PAO/ AOB/ NOB/ fluorescence in situ hybridization (FISH).
图1污水处理站假期前后进水流量的变化 Figure1.Changes of influent flow before and after holidays in wastewater treatment station
图4污水处理站假期前后活性污泥硝化活性历时的变化 Figure4.Diachronic changes in nitrification activity of activated sludge before and after holidays in wastewater treatment station
图5污水处理站假期前后活性污泥的释磷、吸磷活性、乙酸吸收速率及ΔP/ΔHAc历时变化 Figure5.Diachronic changes in phosphorus release activity, phosphorus absorption activity, acetic acid absorption rate and ΔP/ΔHAc ratio of activated sludge before and after holidays in wastewater treatment station
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1.School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 2.Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi'an 710055, China Received Date: 2019-12-21 Accepted Date: 2020-03-19 Available Online: 2020-11-11 Keywords:activated sludge/ campus sewage/ PAO/ AOB/ NOB/ fluorescence in situ hybridization (FISH) Abstract:Campus sewage is characterized as large change in water volume, unstable water quality and pollutant loading. It is a key for the operation of campus sewage treatment system to maintain the sewage treatment system operating in a normal and stable way. In the study, the intermittent A2/O process of a university campus sewage treatment station in Xi'an was taken as the target, and the increase of the anaerobic-aerobic time ratio under low pollutant loading was proposed as the operation strategy in order to decline the decay of nitrifying bacteria and accelerate the restart of treatment process in summer holiday. The results show that the influent of the sewage treatment station during the holiday period was only 5%~10% of the normal treatment period, and the sludge concentration decreased from 4 500 mg·L?1 before the holiday to 3 200 mg·L?1 after the holiday (42 d), only decayed by 29%. The corresponding sludge activities of phosphorus release and absorption declined by 77% and 85.7%, respectively, while the activities of AOB and NOB presented smaller decays with 64% and 34%, respectively. FISH measurement showed that the community structure analysis corresponded to the change in activities. The strategy in summer holiday allowed the functional microorganisms in the sludge to maintain a lower decay rate under anaerobic conditions, the nitrifying bacteria had a lower decay rate than PAOs, which was more conducive to the rapid restart of the activated sludge system after holiday. The results of the study can be used as a technical reference for the holiday operation strategy of the university campus wastewater treatment station.
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