Nitrogen and phosphorus removal in an airlift intermittent circulation membrane bioreactor |
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| Authors: | Haiyan Guo Jiandong Chen Yun Li Tengteng Feng and Shoutong Zhang |
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| Institution: | School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China;Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China;School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China;Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China;School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China;Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China;School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China;Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China;School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China;Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | A new airlift intermittent circulation integrated bioreactor was developed for simultaneous nitrogen and phosphorus removal of wastewater, in which, circulation of mixed liquid between mixing zone and aeration zone was realized by aeration power, alternately anaerobic/anoxic bio-environment in mixing zone was realized by intermittent circulation and simultaneous nitrogen and phosphorus removal was obtained through strengthened denitrifying phosphorus removal process. Removal performance of the reactor was investigated and pollutant removal and transfer mechanism in one operation circle was analyzed. The experiment results indicated that under the influent condition of chemical oxygen demand (COD) concentration of 642.1 mg/L, total nitrogen (TN) of 87.4 mg/L and PO43--P of 12.1 mg/L, average removal efficiencies of COD, TN and PO43--P reached 96.4%, 83.2% and 90.5%, respectively, with the hydraulic residence time of 22 hr and operation circle time of 185 min. Track studies indicated that the separation of aeration and mixing zones and intermittent circulation of mixed liquid between the two zones provided distinct biological environments spatially and temporally, which ensured the occurrence of multifunctional microbial reactions. |
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| Keywords: | nitrogen and phosphorus removal membrane bioreactor intermittent circulation |
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