Start-up and optimization of SNAD process based on modified ASM1
WANG Zhao-zhao1, GAO Peng1, YAN Li-na2, YIN Yao-bin3, ZHANG Huan1, WU Xin-juan1, YIN Chun-yu1, MA Jun1, LI Si-min1
1. Hebei Technology Innovation Center for Water Pollution Control and Water Ecological Remediation, School of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, China; 2. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China; 3. School of Materials Science and Engineering, Hebei University of Engineering, Handan 056038, China
Abstract：An up-flow micro-oxygen membrane bioreactor (UMSB-MBR) was utilized to start up the simultaneous nitrification, anaerobic ammonia oxidation coupling with heterotrophic denitrification (SNAD) process, and a mathematical model was planned to be built to realize the start-up process analysis and the optimization process prediction. The results showed that the SNAD process (the total nitrogen removal rate of 87.66%) started up successfully by inducing the carbon source (C/N ratio of 0.5) after anammox and completely autotrophic nitrogen removal (CANON) processes in the bioreactor, and the start-up model of the SNAD process was successfully built using the ASM1model and experimental data; the model analysis revealed that the increase in the nitrogen loading rate (NLR) (from 0.24kg/(m3·d) to 1.88kg/(m3·d)) and the suitable dissolved oxygen(DO) (0.2~0.4mg/L) accelerated the start-up of the SNAD process; the model prediction revealed that the inhibition of anaerobic ammonia-oxidizing bacteria (AnAOB) from denitrifying bacteria (DNB) was strengthened with the increase in the C/N ratio (from 0.5 to 3.0), and shifted the major nitrogen removal pathway from anammox to heterotrophic denitrification process. From the comprehensive consideration, the appropriate C/N ratio should be chosen at 1.5under which the process performance and distribution of the microbial flora could be at the best state of the SNAD process.
王朝朝, 高鹏, 闫立娜, 殷耀兵, 张欢, 武新娟, 殷春雨, 马骏, 李思敏. 基于改良ASM1的SNAD工艺启动和优化[J]. 中国环境科学, 2021, 41(8): 3590-3600.
WANG Zhao-zhao, GAO Peng, YAN Li-na, YIN Yao-bin, ZHANG Huan, WU Xin-juan, YIN Chun-yu, MA Jun, LI Si-min. Start-up and optimization of SNAD process based on modified ASM1. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(8): 3590-3600.
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