长江口和杭州湾主要污染物降解系数实验研究

Study on Pollutant Degradation Coefficients of Yangtze Estuary and Hangzhou Bay

以长江口和杭州湾4个点位水样为研究对象,通过在环形水槽中开展动静态对比降解实验,得出主要污染物的综合降解系数取值。实验结果表明:动态条件下的综合降解系数,CODMn综合降解系数长江口为0.130 d^(-1),杭州湾为0.082 d^(-1);NH_(3)-N综合降解系数长江口为0.342 d^(-1),杭州湾为0.252 d^(-1);TP综合降解系数长江口为0.126 d^(-1),杭州湾为0.269 d^(-1)。静态条件下杭州湾的主要污染物综合降解系数高于长江口。流速变化对CODMn和TP的降解过程影响较大,受悬沙沉降影响较大的污染物物质动静态降解系数相差较大。

Taking Four water samples form Yangtze estuary and Hangzhou bay as the research object,the comprehensive degradation coefficient of main pollutants was obtained through the dynamic and static comparative degradation experiments in the annular flume.The results show that the comprehensive degradation coefficient under dynamic conditions:CODMn was0.130 d^(-1) in the Yangtze estuary and 0.082 d^(-1) in the Hangzhou bay,NH_(3)-N was 0.342 d^(-1) in the Yangtze estuary and 0.252 d^(-1) in the Hangzhou bay,TP was 0.126 d^(-1) in the Yangtze estuary and 0.269 d^(-1) in the Hangzhou bay.The comprehensive degradation coefficient of pollutants in Hangzhou bay was higher than that of in the Yangtze estuary under static condition.The velocity change has a great influence on the degradation process of CODMn and TP,the dynamic and static degradation coefficients of pollutants affected by suspended sediment deposition are significantly different.