苏北地区某镇农村生活污水分散式处理模式工程设计应用分析

Design and Application Analysis of the Decentralized Treatment Mode of Rural Domestic Sewage in a Town in Northern Jiangsu

经过实地调研与监测,梳理了苏北地区某镇农村生活污水分散处理模式存在的问题,结合农村污水常用分散处理技术和影响因素,从处理效果好、运营维护方便、运行费用低等方面综合考虑,提出了“黑水+化粪池+第四格处理单元+微生态人工湿地/强化快渗地”和“灰水+原位生态净化槽+微生态人工湿地/强化快渗地”农村生活污水分散处理组合工艺,设计并建设了最大处理规模为50m^(3)/d的农村生活污水分散处理系统。同时在系统建成后连续半年的监测数据表明,该组合工艺出水COD、HN_(3)-N、TN和TP水质指标优于《农村生活污水处理设施水污染排放标准》(DB32/3462-2020)二级标准。

Trough field investigation,problems existing in household decentralized treatment for a town in northern Jiangsu rural domestic sewage were sorted out.Considering the commonly used rural sewage treatment technologies and their limitation factors,a combined process of household decentralized treatment for rural sewage“black water+septic tank+fourth treatment unit+micro-ecological constructed wetland/enhanced rapid infiltration land”or“grey water+in-situ ecological purification tank+micro-ecological constructed wetland/enhanced rapid infiltration land”was put forward whilst considering its effectiveness in treatment,easiness and convenience in operation and maintenance,low cost to run,and etc.A decentralised treatment system for rural household sewage with a capacity of 50 m^(3)/d had been designed and constructed.At the same time,the monitoring data for half a year after the completion of the system showed that the effluent quality indicators of COD,HN_(3)-N,TN and TP of the combined process were superior to the secondary standard of the Discharge Standard for Water Pollution from Rural Domestic Sewage Treatment Facilities(DB32/3462-2020).