多段进水A/O生物接触氧化工艺模拟

基于活性污泥1号数学模型(ASM1),结合Fick扩散定律建立了多段进水A/O生物膜工艺数学模型,并采用处理高浓度生活污水的三段进水A/O生物接触氧化工艺的试验结果对模型进行了验证和校验。最后,采用建立的模型研究了工艺的最佳进水流量分配系数。结果表明:①多段进水A/O生物接触氧化工艺对高浓度生活污水有较好的处理效果,当工艺的内回流比控制在0.75～1.00时,可以达到较高的总氮去除效率(>85%); ②建立的模型可以很好地模拟三段进水A/O生物接触氧化工艺的运行; ③当进水碳氮比为10时,模拟得到的工艺最佳流量分配系数分别为0.5、0.3和0.2。该模型能够用于多段进水A/O生物接触氧化工艺各处理单元内发生的生化反应过程的模拟,对多段进水A/O生物接触氧化工艺的运行和设计有指导意义。

Simulation of Step-feeding A/O Biological Contact Oxidation Process

A mathematical model for step-feeding A/O biofilm process was constructed based on activated sludge model No.1(ASM1)and Fick's Law, and a three-step-feeding A/O biological contact oxidation process treating high strength domestic wastewater was utilized for calibration and verification of the model. Eventually, the flow rate distribution coefficient was optimized by the proposed model. The results show that step-feeding A/O biological contact oxidation process can treat the high strength domestic wastewater effectively, and the total nitrogen removal efficiency of the process is relatively higher(>85%)when the internal reflux ratios are 0.75-1.00; the proposed model can simulate the operation of three-step-feeding A/O biological contact process appropriately; when the influent C/N ratio is 10, the simulated optimum flow rate distribution coefficients of the process are 0.5, 0.3 and 0.2. The proposed model can simulate the bio-chemical reactions occurring in treatment units of the process, and guide the design and the operation of the step-feeding A/O biological contact oxidation process.