UASB-A^2/O-MBR组合工艺处理餐厨废水工程

Treatment of Restaurant Wastewater by UASB-A^2/O-MBR Combined Process

采用上流式厌氧污泥床(UASB)-A^2/O-MBR组合工艺系统进行处理高浓有机餐厨废水工程试验研究,分析了COD、NH_3^-N、TN和TP等污染物在各工艺段的降解过程和机理,以及污染物减量和工艺稳定性。结果表明,系统对4种主要污染物的去除率分别达到了96.8%、96.4%、70%、80%,且系统出水水质良好,达到DB 44/26-2001规定中第二时段三级排放标准,且抗冲击负荷能力强。UASB对于COD的去除率贡献最大,为94.33%;A^2/O-MBR系统对NH_4^+-N、TN和TP的去除率贡献最大,分别为76.23%、77.22%和58.05%。系统抗污染物负荷冲击能力依次为COD>NH_4^+-N>TP>TN。

Upflow anaerobic sludge blanket(UASB) reactor combined with A2/O-membrane bioreactor(A2/O-MBR) system was employed to treat high strength organic restaurant wastewater. The degradation process and mechanism of COD, NH4+^-N, TN and TP in each process stage, pollutant decrement and process stability were analyzed. The results showed that, the removal rate of COD, NH4+^-N, TN and TP reached 96.8%, 96.4%, 70% and 80% respectively,the quality of system effluent was good which reached the three level discharge standard of the second period of DB 44/26-2001, and had good resistance to impact load. UASB contributed to 94.33% of COD removal and A2/O-MBR system contributed to 76.23%, 77.22% and 58.05% of NH4+^-N, TN and TP removal respectively. In terms of stability of combined system, the resistance to shock load of different pollutants were COD>NH4+-N>TP>TN.