无根萍对污水塘的净化

Purification of Water of Wastewater Pond by Wolffia arrhiza

摘要: 从2009年4月—2009年9月,利用信阳市郊区的一个农村污水塘(面积:2 500m2;深:1.5 m)的水体进行无根萍生物水质净化研究.实验开始在水体中加入无根萍的数目为4×106个.m-2(干质量:8.9g.m-2).在150 d内,pH值降低了2.4,水体中的总磷含量下降了84.3%,总氮含量下降了46.1%,BOD含量下降了76.9%,COD含量下降了69.1%.无根萍的数目增加了7.3×107个.m-2(干质量:163 g.m-2).无根萍对污水理化性质有明显的改善作用.

Abstract: From April to September in 2009,the water purification in wastewater pond(2 500 m2 area,1.5 m depth) at Xinyang countryside was studied by use of Wolffia arrhiza as treating agent.The amount of Wolffia arrhiza used at beginning stage is 4×106个·m-2(8.9 g·m-2 dry weigh).It was found that the declined values of pH,TP,TN,BOD5 and COD in the wastwater pond are 2.4,84.3%,46.1%,76.9% and 69.1% after 150 days treatment,respectively.The results showed that the water quality of wastewater pond can be impr..