混凝沉淀—UASB—MBR耦合工艺处理屠宰废水

Treatment of slaughter wastewater by coagulation sedimentation-UASB-MBR coupling process

为解决分散式小型屠宰厂在生产过程中产生的高浓度有机废水处理的问题,开展了物化单元(混凝沉淀)、生化单元(上流式厌氧污泥床反应器(UASB)工艺和膜生物反应器(MBR)工艺)对屠宰废水处理效果及影响因素的研究。结果表明:在混凝沉淀实验中,聚合氯化铝(PAC)最佳投加量为60mg/L、最佳pH范围为6.5~8.5;UASB工艺中,最佳进水上升流速为0.12m/h;MBR工艺中,最佳C/N(质量比)为5∶1~7∶1,DO在0.92~1.24mg/L时,对TN有较好处理效果,DO在1.24~1.68mg/L时,对COD及氨氮有较好处理效果。混凝沉淀—UASB—MBR耦合工艺连续运行的28d中,生化单元COD、TN和TP平均去除率分别为95.78%、89.17%、92.46%,出水水质良好。

The effect and influence factors of physical and chemical units(coagulation sedimentation),biochemical units(including UASB process,MBR process)on the treatment of slaughter wastewater were studied,to solve the problem of the high concentration organic wastewater treatment of the scattered small slaughter plant.The results showed that in the experiment of coagulation sedimentation the most suitable dosage of PAC was 60 mg/L,and the most suitable pH of the reaction was 6.5-8.5.In the UASB process,the most suitable rising velocity was 0.12 m/h.In the MBR process,the most suitable C/N range for the reaction process was 5∶1-7∶1.When the concentration of DO was 0.92-1.24 mg/L,the removal efficiency of TN was better,and the removal efficiency of COD and ammonia nitrogen was better when the concentration of DO was 1.24-1.68 mg/L.In the coupling process of continuous operation for 28 days,the average removal rates of COD,TN and TP in biochemical units were 95.78%,89.17%and 92.46%,respectively,and the effluent quality was good.