蚯蚓生态滤池对农村生活污水的深度净化效果

本实验利用多级蚯蚓生态滤池对农村生活污水进行处理研究,分别考察了不同季节蚯蚓生态滤池对COD、TN、NH4+-N和TP的去除效果,同时利用PCR-DGGE技术对不同季节的微生物群落进行初步分析。结果表明,夏季COD、TN、NH4+-N和TP的平均去除率分别达到86.05%、89.02%、98.48%和99.1%;出水浓度17.86、4.96、0.605和0.047 mg/L。冬季COD、TN、NH4+-N和TP的平均去除率分别达到83.29%、93.26%、96.96%和92.7%;出水浓度22.68、2.63、1.02和0.37 mg/L。不同季节出水水质均达到了《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A类标准。蚯蚓生态滤池内的微生物多样性冬季的要比夏季的丰富,且冬季滤池内微生物种类从上至下逐渐增加,符合污染物去除效率的变化。

Study of earthworm ecology filter for rural sewage purification

In this study,multi-stage earthworm ecology filter was used for sewage treatment in rural areas.The removal efficiencies of COD,TN,NH+4-N,TP and analyst microbial communities by PCR-DGGE in different seasons were investigated.The results showed that removal efficiencies(COD,TN,NH+4-N and TP) reached 86.05%,89.02%,98.48% and 99.1% in summer and 83.29%,93.26%,96.96% and 92.7% in winter.The effluent concentrations of COD,TN,NH+4-N and TP were 17.86 mg/L,4.96 mg/L,0.605 mg/L,0.047 mg/L and 22.68 mg/L,2.63 mg/L,1.02 mg/L and 0.37 mg/L in the two different seasons,which met the need of "Urban Sewage Treatment Plant Pollutant Discharge Standard"(GB18918-2002) Class A.Microbial diversity in winter was richer than that in summer and species increased gradually from top to bottom,because of the same change of pollutant removal efficiency.