生物生态耦合系统对分散式农村生活污水的深度净化

Deep purification of decentralized rural domestic sewage by vertical coupled biological and ecological system

针对分散式农村生活污水排放标准的提升,通过集约式立体生物生态耦合系统对农村生活污水二级处理出水进行深度净化,采用国家标准方法对系统进出水中的COD、氨氮、TN和TP进行了测定,评价了系统对各污染物质的去除效果。结果表明:在实验进水COD,氨氮,TN和TP均属于《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级B标准时,系统稳定后实验出水的COD,氨氮,TN和TP的浓度分别可降至9~35、1~7、8.0~14.9、0.20~0.47 mg·L-1,均满足一级A标准。随着流水分区不同,COD,氨氮,TN和TP的浓度逐渐降低。采用集约式立体生物生态耦合系统可使农村生活污水二级处理出水水质达到一级A排放标准,实现深度净化的需求。

Aiming at the improvement of the water quality standard of decentralized rural-domestic sewage secondary effluent,the intensive vertical coupled biological and ecological technology was used to deeply purify the secondary effluent of rural domestic sewage.The COD,ammonia nitrogen,TN and TP in the influent and effluent were measured according to the national standard method,and the removal efficiencies of various pollutants by this coupled system were evaluated.Experimental results show that when the influent water quality parameters,such as COD,ammonia nitrogen,TN,and TP,conformed to town sewage treatment plant pollutant discharge standard(GB 18918-2002)in the level I class B standard,the stable effluent concentrations of COD,ammonia nitrogen,TN,and TP could be reduced to 9~35,1~7,8.0~14.9 and 0.20~0.47 mg·L-1,respectively,which could meet the level I class A standard.The concentrations of COD,ammonia nitrogen,TN and TP are gradually decreased at different zones along the water flow direction.The vertical coupled biological and ecological technology can meet the requirements of deep purification for secondary treatment effluent of rural domestic sewage and achieve the level I class A standard.This study provides a theoretical reference for the popularization and application of the technology.