LI Xiao-chuan,YUAN Quan,SONG Ya-peng,et al.Pilot Study on Magnetic Separation Combined with Dual Sludge Retention Time Nitrogen Removal Process for Municipal Wastewater Treatment[J].China Water & Wastewater,2023,39(15):58-63.
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Pilot Study on Magnetic Separation Combined with Dual Sludge Retention Time Nitrogen Removal Process for Municipal Wastewater Treatment

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第15期 Page: 58-63 Column: Date of publication: 2023-08-01
Author(s):
LI Xiao-chuan1; 2;  YUAN Quan3; SONG Ya-peng1; 2; HE Cong-hui1; MA Jin-yuan1; LIANG Rui-song1; 2; XU Heng2; CHEN Yun4; QIAN Liang4; WANG Kai-jun1; LIU Jie5; LIN Jia5
（1. School of Environment， Tsinghua University， Beijing 100084， China； 2. School of Chemical & Environmental Engineering， China University of Mining and Technology-Beijing， Beijing 100083， China； 3. School of Ecology and Environment， Beijing Technology and Business University， Beijing 100048， China； 4. Thunip Co. Ltd.， Beijing 100084， China； 5. Beijing Capital Eco-Environment Protection Group Co. Ltd.， Beijing 100044， China）
Keywords:
magnetic separation;  dual sludge retention time;  combined nitrogen removal;  low carbon source wastewater;  mainstream anammox
Abstract:
This paper developed a pilot scale super-magnetic separation coupled with dual sludge retention time (SRT) nitrogen removal process, of which the super-magnetic separation technology was used to separate and concentrate carbon sources, and the dual SRT nitrogen removal process was employed to remove nitrogen from the effluent after carbon source separation. After more than 750 days of continuous operation, the super-magnetic separation process achieved a carbon source retention rate of more than 50% under a very short hydraulic retention time (HRT, approximately 10 min), and the total nitrogen in the effluent from the dual SRT combined nitrogen removal process remained below 10 mg/L, which met the level A limit specified in Discharge Standard of Water Pollutants for Municipal Wastewater Treatment Plants (DB 11/890-2012) of Beijing. The anammox activity of biofilm from the anoxic tank was 45.75-71.03 mg/(L·d). The addition of nitrite into the anoxic tank was conducive to recovering the anammox activity, and the intermittent micro-aeration in anoxic tank promoted the partial nitrification/anammox activity and autotrophic nitrogen removal, and improved the nitrogen removal efficiency of the system. This paper preliminarily verified the feasibility of the super-magnetic separation coupled with dual SRT combined nitrogen removal process, and laid a foundation for further study of the process.
Last Update: 2023-08-01