垂直流人工湿地净化生活污水的试验研究

通过试验考察垂直潜流人工湿地在不同的水力负荷、pH值、有机负荷下对生活污水的净化效果。试验结果表明,在较低水力负荷内,CODCr去除率都保持在70%以上。当水力负荷在0.15 m3/(m2.d)时,NH3-N的去除率在试验范围内最高为92%。垂直流湿地在pH值为8的运行条件下净化效果最佳,CODCr、NH3-N、TP的去除率分别为80%、84%、82%。有机负荷在22.5～45 gCODCr]/(m2.d)时,CODCr去除率都能保持在80%以上。当有机负荷增加至52.5 gCODCr]/(m2.d)时,CODCr和NH3-N的去除效果迅速降低。垂直流湿地系统适合的进水条件为水力负荷0.05～0.2 m3/(m2.d)、进水pH值为7～8、有机负荷为22.5～45gCODCr]/(m2.d),此时对CODCr、NH3-N、TP均有比较好的去除效果。

Purification of domestic sewage by vertical-flow constructed wetland

The effect of vertical-flow constructed wetland under different hydraulic loading rates,pH value and organic loading rates on domestic sewage purification was investigated.The results showed that,under lower hydraulic loading condition,the removal rate of CODCr maintained up to 70%.When the hydraulic loading rate was 0.15 m3/(m2.d),the removal rate of NH3-N reached the highest-92%.The best purification effect of the vertical-flow constructed wetland was obtained when the pH value was 8.The removal rates of CODCr,NH3-N,TP were 80%,84% and 82% respectively.The removal rate of CODCr was kept above 80% at organic loading rate in range of 22.5-45 gCODCr]/(m2.d).When the organic loading rate increased to 52.5 gCODCr]/(m2.d),the CODCr and NH3-N removal efficiency decreased rapidly.Therefore,the suitable influent condition for the vertical-flow constructed wetland were: the hydraulic loading rate was 0.05-0.2 m3/(m2.d),the influent pH value was 7-8,the organic loading rate was 22.5-45 gCODCr]/(m2.d),and the removal efficiency of CODCr,NH3-N and TP were all satisfactory under the above condition.