Contaminant removal characteristics of bioflocculation-AAAO pilot system and cultivation of denitrifying polyphosphate-accumulating organisms
SHI Yan1,, ZOU Lüxi1, SHAN Wei1, ZHENG Kaikai1, WANG Yan1, LI Ji1,2,3,, 1.School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China 2.Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China 3.Collaborative Innovation Center of Water Treatment Technology and Material of Jiangsu Colleges, Suzhou 215009, China
Abstract:In order to reduce the operation cost and achieve good effluent, the pilot-scale bioflocculation-anoxic-anaerobic-anoxic-oxic(AAAO) process was established to cultivate denitrifying polyphosphate-accumulating organisms(DPAOs) and further enhance phosphorus removal by adding simulative carbon source from bioflocculation sludge through anaerobic digestion(AD) process. The experimental results showed that the bioflocculation process presented good resistance to shock loads, and the average removal rates of chemical oxygen demand(COD), total nitrogen(TN) and total phosphorus(TP) were 67.23%, 27% and 68.93%, respectively. After dosing carbon source produced from simulative anaerobic digestion to anaerobic tank, and DPAO acclimation was promoted, then the COD, TN and TP removal rates of AAAO system increased by 31.53%, 37.67% and 26.37%, respectively. In addition, the maximum phosphorus uptake rate during denitrification process was up to 62.97%, and the TN and COD in effluent of secondary tank could meet the Class A of National Effluent Standard, the effluent TP even decreased to below 0.30 mg·L?1. The pilot-scale bioflocculation-AAAO process demonstrated a good nitrogen and phosphorus removal capacity, which can lay a foundation for energy-saving and cost-reducing operation of wastewater treatment plants, and is expected to be widely promoted. Key words:bioflocculation/ AAAO process/ pilot-scale wastewater treatment/ denitrifying phosphorus removal.
图1生物絮凝-AAAO中试系统流程图和现场照片 Figure1.Diagram and picture of bioflocculation-AAAO pilot system
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1.School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China 2.Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China 3.Collaborative Innovation Center of Water Treatment Technology and Material of Jiangsu Colleges, Suzhou 215009, China Received Date: 2018-12-05 Accepted Date: 2019-03-13 Available Online: 2019-08-06 Keywords:bioflocculation/ AAAO process/ pilot-scale wastewater treatment/ denitrifying phosphorus removal Abstract:In order to reduce the operation cost and achieve good effluent, the pilot-scale bioflocculation-anoxic-anaerobic-anoxic-oxic(AAAO) process was established to cultivate denitrifying polyphosphate-accumulating organisms(DPAOs) and further enhance phosphorus removal by adding simulative carbon source from bioflocculation sludge through anaerobic digestion(AD) process. The experimental results showed that the bioflocculation process presented good resistance to shock loads, and the average removal rates of chemical oxygen demand(COD), total nitrogen(TN) and total phosphorus(TP) were 67.23%, 27% and 68.93%, respectively. After dosing carbon source produced from simulative anaerobic digestion to anaerobic tank, and DPAO acclimation was promoted, then the COD, TN and TP removal rates of AAAO system increased by 31.53%, 37.67% and 26.37%, respectively. In addition, the maximum phosphorus uptake rate during denitrification process was up to 62.97%, and the TN and COD in effluent of secondary tank could meet the Class A of National Effluent Standard, the effluent TP even decreased to below 0.30 mg·L?1. The pilot-scale bioflocculation-AAAO process demonstrated a good nitrogen and phosphorus removal capacity, which can lay a foundation for energy-saving and cost-reducing operation of wastewater treatment plants, and is expected to be widely promoted.