活性污泥过程反应池与二沉池耦合模型与模拟

将二沉池一维通量模型与反应池活性污泥2号模型(ASM2)耦合,建立了活性污泥过程模型.模型应用于重庆某污水处理厂,结果表明,该模型可以较好地对出水中COD、SS、TN及TP进行模拟.针对该污水处理厂现行运行条件,分析了影响活性污泥系统的因素,提出优化运行参数,将二沉池污泥回流比由原来的0.75减至0.20～0.25,剩余污泥排放量从原来的591m³/d至204～249m³/d;将反应池污泥浓度由原来的1.2g/L增加至2.8g/L,可提高系统抗负荷冲击和抗低温的能力,改善系统出水水质.

The simulation and the model of activated sludge process reactor with secondary settling tank

An activated sludge process model was established using 1-D flux model of the secondary settling tank coupled with ASM2, and was applied to certain wastewater treatment plant (WWTP) in Chongqing. This model could simulate relatively well the COD, SS, TN and TP in the effluent. Based on the present operation conditions of the plant the factors influencing the activated sludge system were analyzed with suggesting the optimized operation parameters: the sludge recycle ratio of the secondary settling tank was decreased from original 0.75 to 0.20~0.25. The residual sludge discharge amount was decreased from original 591m3/d to 204~249m3/d, the reactor sludge concentration increased from original 1.2g/L to 2.8g/L. Therefore, the abilities of the system for resisting the loading impact and low temperature was enhanced and the effluent quality was improved.