Effect of change in ammonia nitrogen loading rate on partial nitrification and rapid construction of partial nitrification
YUAN Hongying1,2,3,,, ZHAO Xin1,2, WANG Hongbin1,2, QIAN Yunzhi4, MA Huaji1,2, WANG Jinglin1,2, LAI Jiangling1,2 1.College of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China 2.Tianjin Key Laboratory of Water Quality Science and Technology, Tianjin 300384, China 3.Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, Tianjin 300384, China 4.Department of Environmental Innovation, Department of Environmental Sciences, Tohoku University, Sendai, 980-8579, Japan
Abstract:The stable operation of partial nitrification is crucial in the integrated partial nitrification - anaerobic ammonium oxidation process (PN/A). Experiments are conducted to explore the influence and recovery process of partial nitrification process in an internal circulation contact oxidation membrane bioreactor (ICCOMBR) after changing the inlet ammonia nitrogen loading rate (ALR).The study found that the ALR of the system inlet was reduced to 0.10 kg·(m3·d)?1 (ammonia concentration was 100 mg·L?1, HRT 24 h) and part of the nitrification process was destroyed rapidly when HRT was 24 h and DO was between 2.0 mg·L?1 to 2.5 mg·L?1. When the ALR at the system inlet rose to 0.40 kg?(m3·d)?1 (ammonia nitrogen concentration was 400 mg·L?1, HRT was 24 h), partial nitrification process was rapidly resumed within 3 days. After partial nitrification was restored to stability, the ALR was increased to 0.60 kg· (m3·d)?1 (ammonia concentration was 400 mg·L?1, HRT was 16 h). Meanwhile, HRT and DO were adjusted to achieve partial nitrification when HRT was 16 h and DO was between 0.5 mg·L?1 to 1.0 mg·L?1. Finally, partial nitrification was successfully started by changing the aeration (AR) to 0.9 L·min?1, controlling DO at (0.76±0.11) mg·L?1 and pH at 9.7~8.2. Key words:Anammox/ contact oxidation/ partial nitrification/ ammonia nitrogen loading rate/ dissolved oxygen/ alkalinity.
图1反应器的结构示意图 Figure1.Structure diagram of the reactor
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1.College of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China 2.Tianjin Key Laboratory of Water Quality Science and Technology, Tianjin 300384, China 3.Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, Tianjin 300384, China 4.Department of Environmental Innovation, Department of Environmental Sciences, Tohoku University, Sendai, 980-8579, Japan Received Date: 2020-10-22 Accepted Date: 2021-04-26 Available Online: 2021-09-15 Keywords:Anammox/ contact oxidation/ partial nitrification/ ammonia nitrogen loading rate/ dissolved oxygen/ alkalinity Abstract:The stable operation of partial nitrification is crucial in the integrated partial nitrification - anaerobic ammonium oxidation process (PN/A). Experiments are conducted to explore the influence and recovery process of partial nitrification process in an internal circulation contact oxidation membrane bioreactor (ICCOMBR) after changing the inlet ammonia nitrogen loading rate (ALR).The study found that the ALR of the system inlet was reduced to 0.10 kg·(m3·d)?1 (ammonia concentration was 100 mg·L?1, HRT 24 h) and part of the nitrification process was destroyed rapidly when HRT was 24 h and DO was between 2.0 mg·L?1 to 2.5 mg·L?1. When the ALR at the system inlet rose to 0.40 kg?(m3·d)?1 (ammonia nitrogen concentration was 400 mg·L?1, HRT was 24 h), partial nitrification process was rapidly resumed within 3 days. After partial nitrification was restored to stability, the ALR was increased to 0.60 kg· (m3·d)?1 (ammonia concentration was 400 mg·L?1, HRT was 16 h). Meanwhile, HRT and DO were adjusted to achieve partial nitrification when HRT was 16 h and DO was between 0.5 mg·L?1 to 1.0 mg·L?1. Finally, partial nitrification was successfully started by changing the aeration (AR) to 0.9 L·min?1, controlling DO at (0.76±0.11) mg·L?1 and pH at 9.7~8.2.