低温季节生物栅对富营养化河水净化试验研究

文章介绍和分析了低温季节不同工况条件下生物栅净化池对富营养化河水的处理效果。结果表明,11月中旬到12月底期间,江南地区的气温和河道水温都较低,生物栅池中水生植物(水花生)处于休眠和枯死阶段,生物膜上微生物活性也较低,因此河水在池中的净化主要由过滤、沉淀和吸附等物化作用完成的,停留时间为10h时生物栅池对河水中COD、NH4+-N、TN和TP的平均去除率为16.7%～38.8%、30.0%～41.7%、14.1%～35.0%和15.4%～44.4%。随着气温和水温的进一步降低(A阶段到B阶段),河水中污染物的去除率也逐渐下降(下降幅度为2%～10%),低温导致污染物沉淀和吸附速度及生物膜活性降低可能是其中的主要原因。低温季节富营养化河水的DO含量较高,温度越低,填料类型、曝气与否、植物有无对污染物去除率的影响也越小。

Purification of Eutrophic River Water with Bioscreen under Low Temperature

The purification effect of bioscreen on eutrophic river water was investigated under low temperature. The experiment,operated during middle of November to December,showed that water quality kept good level by physical chemistry action in river water when aquatic plants were resting and activeness of microorganism was lower. Average removal efficiency of COD,NH-N,TN and TP from water was 16.7%~38.8%,30.0%~41.7%,14.1%~35.0% and 15.4%~44.4% respectively under HRT of 10h. The removal efficiency was decreased with the falling of temperature. In the low temperature season and high content of DO in eutrophic river water,package,aquatic plants and oxidation had no obvious effect on removal efficiency of pollutants.