东江上游支流河口前置库系统水质净化效果研究

STUDY ON WATER QUALITY PURIFICATION EFFECT BY ESTUARY PRE-DAM SYSTEM ON UPPER REACHES OF THE DONGJIANG RIVER TRIBUTARY

通过对建立在河源市高埔小河支流入东江口的前置库系统进行研究,结果表明:前置库系统对入江河流中COD、NH^+_4-N、TN、TP、SS(雨天)的去除作用明显,平均去除率分别为42.4%、28.0%、29.9%、22.8%、62.9%。前置库系统不同功能区对各污染指标有不同的去除效果。砾石河床对COD、NH^+_4-N、SS的去除效果较显著,前置库净化区对TN、TP有较好的净化效果。不同水文期,前置库系统的净化效果不同。COD在枯水期净化效果最好,丰水期次之;而NH^+_4-N、TN、TP的净化效果则均是平水期>丰水期>枯水期。该前置库系统能有效削减入江污染负荷,其中SS的年削减量最大,为406.94 t/a。

We studied a pre-dam system built on the tributary where Gaopu River flows into the Dongjiang River in Heyuan. The results showed that its removal effects of COD,NH4^+-N,TN,TP and SS (rainy day)were significant,with the average removal rates of 42.4%,28.0%,29.9%,22.8%and 62.9%,respectively.Different functional areas of the pre-dam system had different removal effects on various pollutant indexes.Gravel bed had a significant removal effect on COD,NH4^+-N and SS,while the purification area of the pre-dam had better purification effect on TN and rip.In different hydrological periods,the purification effect of the pre-dam system was different.The purification effect of COD was the best in the dry season,followed by the wet season;while NH4^+-N,TN,and TP had the best purification effects in the normal season, followed by the wet season and the dry season.The pre-dam system could effectively reduce the pollution loads into the river, and the annual reduction of SS was the largest with the amount of 406.94tons per year.