改进UASB-SBR-人工湿地处理养猪废水的研究

Improved Treatment of Swine Wastewater by UASB-SBR-Constructed Wetlands

为解决养猪废水对农村水环境污染的重要问题,采用改进的自循环UASB-SBR-人工湿地联合处理工艺,利用产生的沼气搅拌增加反应器中的传质效果,加入经水解酸化的原水用于SBR池反硝化脱氮,采用回收给水污泥中的铝铁盐为基质的人工湿地对出水氮磷进一步强化处理,试验结果证明可使处理后出水氨氮浓度控制在15~25 mg·L^-1,COD浓度控制在160~200 mg·L^-1,出水各项指标满足畜禽养殖业污染物排放标准(GB18596-2001)要求。

To solve the pollution of swine wastewater to rural water environment,an improved treatment process combining self-circulating up-flow anaerobic sludge bed,sequencing batch reactor activated sludge process and constructed wetland was adopted. Firstly,we increased the mass transfer efficiency in the reactor by stirring with the produced biogas,and then added the hydrolyzed acidified raw water to SBR for denitrification. Finally,we treated the nitrogen and phosphorus of effluent by aluminium and iron from recycled water in the constructed wetlands sludge. The experiment results show that the concentration of ammonia nitrogen and chemical oxygen demand in the treated effluent can be controlled at 15-25 mg·L^-1 and 160-200 mg·L^-1 respectively,which meets the pollutant discharge standards of livestock and poultry farming(GB18596-2001).