基于改良ASM1的SNAD工艺启动和优化

采用微氧升流式膜生物反应器(UMSB-MBR)启动同步亚硝化厌氧氨氧化耦合异养反硝化(SNAD)工艺,拟通过构建数学模型实现工艺启动过程分析及其优化过程预测.结果 表明:反应器历经厌氧氨氧化和全程自养脱氮(CANON)工艺后,通过引入有机碳源(C/N比为0.5)启动SNAD工艺(总氮去除率可达87.66％),并运用AS...

Start-up and optimization of SNAD process based on modified ASM1

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.