六种北方乔木植物净化污水效果研究

Purification Effect of Sewage of 6 Kinds of Northern Trees

以蛭石为基质,采用盆栽模拟法,对家榆、桃叶卫矛、旱柳、稠李、水曲柳及紫椴6种北方乔木植物净化污水中总磷(TP)、总氮(TN)、污染物净化率(COD)的效果进行比较。结果表明:各植物对污染物均表现出较好的净化效果;总体来看,对TP的净化能力,旱柳>水曲柳>家榆>紫椴>稠李>桃叶卫矛;对TN的净化能力,旱柳>稠李>水曲柳>紫椴>桃叶卫矛>家榆;对COD的净化能力,稠李>旱柳>紫椴>水曲柳>家榆>桃叶卫矛;随生长时间延长,各植物对污染物的净化率呈先下降后趋于稳定的变化趋势;最后,对供试植物及基质净化污水的作用进行了机理分析。

Based on vermiculite as medium,using potted simulation method,the sewage purification effect of 6kinds of northern trees on TP,TN and COD were compared.The results showed that,these trees showed better purification effect on pollutants.Overall,the purification ability of TP,Salix matsudana Koidz.〉Fraxinus mandschurica Rupr.〉Ulmus pumila L.〉Tilia amurensis Rupr.〉Prunus padus L.〉Euonymus maackii Rupr.;purification ability of TN,Salix matsudana Koidz.〉Prunus padus L.〉Fraxinus mandschurica Rupr.〉Tilia amurensis Rupr.〉Euonymus maackii Rupr.〉Ulmus pumila L.;purification ability of COD,Prunus padus L.〉Salix matsudana Koidz.〉Tilia amurensis Rupr.〉Fraxinus mandschurica Rupr.〉Ulmus pumila L.〉Euonymus maackii Rupr..With the growing time prolonged,the trees of pollutant purification rate was decreased and then tended to be stable.Mechanism of purification and sewage effect for the test herbs and matrix was analyzed at last.