人工湿地基质中土壤酶空间分布及其与水质净化效果之间的相关性

Spatial Distribution of Enzymatic Activities in Substrate of Constructed Wetland and Its Correlation with Purification of Wastewater

人工湿地已被广泛用于处理各种类型的废水.研究了人工湿地基质中磷酸酶、脲酶和蛋白酶活性的空间分布规律及与污水净化效果之间的关系.磷酸酶和脲酶的活性随基质深度的增加而降低,蛋白酶活性在基质上层最高,下层次之,中层最低;湿地上池基质磷酸酶、脲酶和蛋白酶活性大于下池.磷酸酶活性与污水总磷、CODcr、BOD5去除率正相关;脲酶与总氮的去除率正相关;蛋白酶与总氮、总磷、CODcr、BOD5去除率没有相关性.该研究为利用酶活性作为评价净化效果的指标提供了理论依据.

The spatial distribution of activities of phosphatase, urease and proteinase in the substrate of the constructed wetland and its relationship with purification efficiency of wastewater were studied. With increasing the substrate depth, phosphatase and urease activities decreased. Proteinase activity in substrate was in the order that upper layer >lower layer >middle layer. Phosphatase, urease and proteinase activities in up-flow chamber were higher than those in down-flow chamber. Phosphatase activity is positively correlated to the removal rates of total nitrogen, total phosphorus, COD_(cr) and BOD_5; Urease activity was positively correlated to the removal rate of total nitrogen; Proteinase activity was not significantly correlated to the removal rates of total nitrogen, total phosphrous, COD_(cr)and BOD_5.The research offered the theoretical basis for using substrate enzymatic activity as evaluation index of purification efficiency.