厌氧段-人工湿地处理污水高效稳定机理研究

Mechanism of High Efficient and Stabilization of Anaerobic Stage-Constructed Wetland System in Treatment of Sewage

针对农村生活污水中悬浮物(SS)影响人工湿地运行稳定性问题,该研究在人工湿地前增加折流板厌氧池形成厌氧段-人工湿地污水处理系统。为期36个月的生产性试验研究结果表明,常温下厌氧段对SS的去除率约80%,整套系统对COD、TN、TP去除率分别为80.95%、85.12%、68.15%;低温下系统对COD、TN、TP去除率分别为69.35%、82.78%、61.27%。基于试验结果,阐明了厌氧段-人工湿地污水处理系统长期高效稳定的机理在于厌氧段具有较强的SS去除能力,并能使污水的可生化性得以显著提高的特点。

Prompted by the suspended solid（SS） in sewage impacting long-term stable operation,the anaerobic stage was integrated with constructed wetland.As a result,the anaerobic stage-constructed wetland system was designed to treat low strength sewage.The results of 36 month indicated that SS removal rate of the anaerobic stage was about 80%.COD,TN,TP removal rates of anaerobic stage-constructed wetland integrated wastewater treatment system could be over 80.95%,85.12% and 68.15% respectively.When the temperature decreased to 12℃,COD,TN,TP removal rates of integrated system could maintain 69.35%,82.78% and 61.27% respectively.Based on the results of trial,the mechanisms of long-term higher efficient operation of integrative sewage system in treatment of low strength sewage were owed to the high efficient SS removal rate and the excess sludge was decreased markedly at anaerobic stage.