三级生态塘强化处理农村生活污水的应用研究

Performance of Three-stage Eco-ponds for Treating Rural Domestic Sewage

研究了三级生态塘对农村生活污水的实际处理效果。近1年半的监测结果表明,三级生态塘能有效去除污染物,对COD的去除率一般在60%以上、大部分时间在80%以上,对TN的去除率在80%以上、最高达到95%,对NH+4-N和TP的去除率均在90%以上,最终出水水质能达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级B标准。兼性塘/生物塘设置的水体强化循环无动力复氧系统能有效提高生态塘内的DO浓度,使其由厌氧进水中的不足2 mg/L增加到生物塘内的6 mg/L以上,增氧效果明显,提高了脱氮除磷效果。三级生态塘的处理效果受温度影响很小,该技术适于在巢湖流域等具有坑塘改造条件的农村区域推广应用。

The performance of three-stage eco-ponds for treating rural domestic sewage has already been studied. The monitoring results for a year and a half showed that the removal rates of COD, TN, NH4-N and TP were more than 60% （ 〉80% mostly of time）, 80% （up to 95%）, 90% and 90% respectively, and the quality of the final effluent could reach the first level B criteria specified in the D/s- charge Standard of Pollutants for Municipal Wastewater Treatment Plant （ GB 18918 - 2002 ）. The en- hanced circulation unpowered reaeration system installed between facultative pond and biological pond could effectively improve the content of DO from less than 2 mg/L to more than 6 mg/L in the eco-ponds, which could enhance nitrogen and phosphorus removal. The performance of three-stage eco-ponds was less affected by temperature, and the technology could be suitable for application in rural areas with the abandoned ponds in Chaohu Lake basin.