生物脱氮与甲烷化耦合的EGSB-BAF工艺模拟

以活性污泥3号模型(ASM3)为平台,通过引入厌氧氨氧化和甲烷化过程、以2步硝化-反硝化取代1步硝化-反硝化过程以及区分硝酸盐和亚硝酸盐条件下的内源呼吸过程,建立了同时具有甲烷化、厌氧氨氧化和2步硝化反硝化功能的EGSB-BAF工艺模型.该模型包括5种微生物、28个生物过程,同时考虑了温度、pH值和抑制性物质对生物过程的影响.以实验室EGSB-BAF集成工艺的实验数据,结合灵敏度分析对部分模型参数进行了校核.采用校核后的模型对集成工艺EGSB段和BAF段出水的COD、NH4+-N、NO2--N和NO3--N浓度进行模拟,结果表明,EGSB段和BAF段的出水中COD、NH4+-N、NO2--N和NO3--N浓度的模拟值与实测值的误差在可接受范围内.表明模型能够描述工艺的主要生物反应过程,可以作为指导工艺研究、设计和运行优化的手段.

Modeling EGSB-BAF process capable of biological nitrogen removal and methanogenesis

Based on activated sludge model No.3, a mathematic model was developed for a lab-scale EGSB-BAF integrated process. In this modified ASM3, methanogenesis and anammox are incorporated, two-step nitrification-denitrification is adopted and accordingly, anoxic endogenous respiration is described as nitrate- and nitrite -dependent process, respectively. The model contains 5 organisms and 28 biological processes, simultaneously taking in account the effect of temperature, pH and inhibitors on some processes. Parts of the parameters of the model were calibrated using measurements of the EGSB-BAF process combining sensitivity analysis. Errors between the calculated and measured concentrations of COD, NH₄⁺-N, NO₂^--N and NO₃^--N in the effluent of EGSB and BAF stage are acceptable. It could be concluded that the model could describe the biological conversion of COD and nitrogen in the EGSB-BAF process and be used as a tool for the research, design and optimization of the integrated process.