土地处理池塘污水影响因素的实验研究

通过户外动态土柱模拟实验,研究了淹水时间、土壤厚度、土壤粒径和淹水深度对池塘污水处理效果的影响。实验结果表明:连续淹水超过4～5d,COD去除率明显下降;相同进水条件下,土层厚度在120cm处,COD去除率达到80%以上;土壤粒径<0.1mm时,COD去除率达到90%;在土层厚度120cm处,淹水深度为60cm时,COD去除率仅40%。

Influence of Wastewater Land Treatment System

Through absorption capacity experiments of outdoor dynamic soil,the influence of relevant key factors upon the effects of wastewater land treatment system was studied.The experiments result showed that during the course of wastewater osmosis to the soil,the time of osmosis had great influences upon the removal of polluted substances of wastewater.At the beginning of osmosis,the removal rate was higher.In 4 to 5 days,the absorption rate towards COD sharply decreased.Thus the osmosis shall not be over 4 to 5 days.When the soil thickness as filter medium take 120cm,the removing rate of COD was up to 80%.When the soil particle size was smaller than 0.1mm,the removing rate of COD was up to 90%.Along with the water depth increase,the removing rate of COD to the sewage was reducing unceasingly.When the water depth was 60cm and the soil thickness as filter medium took 120cm,the removing rate of COD was only 40%.