活性污泥增强地下渗滤系统去除生活污水中氮污染

Removal of nitrogen pollution from domestic sewage by activated sludge enhanced subsurface infiltration system

将棕黄壤、炉渣和活性污泥按一定比例添加配置生物填料,装填在5个土柱(编号为1#~5#)中,棕黄壤和炉渣按1∶1体积比配置,1#~4#土柱再分别添加0、2.5%(体积分数,下同)、5.0%、10.0%活性污泥,5#土柱只在生物填料层下部40cm处添加5.0%的活性污泥。通过构建的地下渗滤系统研究不同水力负荷下系统的污水处理效果。结果表明:水力负荷适宜为12cm3/(cm2·d),添加活性污泥最佳为5.0%(体积分数),此时土柱的启动周期为22d,氨氮和TN去除率分别稳定为94.4%、77.8%。

Five pilot subsurface infiltration systems（SIS）were filled with the brown soil,slag and activated sludge mixed completely.The ratio of brown soil and slag was 1∶1.The first to fourth soil columns were filled with different percent activated sludge（0,2.5%,5.0%,10.0%）.The fifth soil column was filled with 5.0% activated sludge only in the lower 40 cm of the biological packing layer.The denitrification efficiency of the SIS under different hydraulic loading conditions was researched.The experimental results showed that the best hydraulic load was 12 cm3/（cm2·d）and the optimum ratio of activated sludge was 5.0%.The start-up period was 22 days and the average removal rates of ammonia nitrogen and TN were 94.4% and 77.8% under the best condition.