【摘要】：龍泓澗是杭州西湖上游重要的入湖溪流之一,作為西湖營養(yǎng)鹽的重要來源,龍泓澗流域水質(zhì)對西湖水質(zhì)產(chǎn)生很大的影響。龍泓澗流域分為主流和支流,在主、支流入湖末段構(gòu)建有多級生態(tài)凈化塘,通過對龍泓澗流域進行全面調(diào)研和現(xiàn)場勘查,以及對其水質(zhì)一年的定期監(jiān)測,分析其水體特征及變化規(guī)律,結(jié)果顯示龍泓澗生態(tài)塘進水水質(zhì)長期處于“低碳、低磷、高氮”狀況。龍泓澗多級生態(tài)塘利用植物修復(fù)技術(shù)原理,通過對水體中的污染物進行物理、化學(xué)、生物等凈化作用,使得水體中污染物得以去除。其中,主流多級生態(tài)塘對水體中TN、TP、NO3-N、COD的平均去除率為42.5%、42.8%、52.9%、52.6%,支流多級生態(tài)塘對水體中TN、TP、NO3-N、COD的平均去除率為62.1%、77.3%、69.3%、59.6%,主、支流出水水質(zhì)分別滿足《地表水環(huán)境質(zhì)量標準》(GB3838-2002)Ⅴ類和Ⅳ類標準。此外,采用綜合營養(yǎng)狀態(tài)指數(shù)法對生態(tài)塘水質(zhì)進行富營養(yǎng)化評價分析,結(jié)果表明,龍泓澗主流生態(tài)塘水體處于中度富營養(yǎng)化水平,支流生態(tài)塘水體處于輕度富營養(yǎng)化程度。在水體水量平衡分析的基礎(chǔ)之上,通過建立污染物凈積累量(NPA)數(shù)學(xué)模型,對主、支流生態(tài)塘水體污染物年總量進行計算分析,確定出主流生態(tài)塘COD、TN和TP的年凈積累量分別為:11696kg、3759kg和35.7kg;支流污染物COD、TN和TP的年凈積累量分別為:12360kg、3340kg和91.3kg,求解出的NPA結(jié)果表明生態(tài)塘對水體污染物強大的截留能力。以TN作為分析因子,建立一維水質(zhì)模型,計算出主流生態(tài)塘的環(huán)境容量為12.67t/a,現(xiàn)狀環(huán)境容量為21.17t/a,其現(xiàn)狀容量已遠遠超過生態(tài)塘水環(huán)境容量允許值;支流生態(tài)塘的水環(huán)境容量為36.95t/a,現(xiàn)狀容量為35.06t/a,暫且未超出生態(tài)塘的納污能力。通過對龍泓澗主、支流生態(tài)塘水體的富營養(yǎng)化評價、水質(zhì)現(xiàn)狀評價以及水環(huán)境解析,依據(jù)分析結(jié)果,可全面掌握生態(tài)塘的水體水質(zhì)污染狀況及主要污染物,對龍泓澗水質(zhì)的有效控制及管理提供一定的科學(xué)依據(jù)。
[Abstract]:Longhongjian is one of the most important streams in the upper reaches of the West Lake in Hangzhou. As an important source of nutrients in the West Lake, the water quality of the Longhongjian Basin has a great influence on the water quality of the West Lake. Longhongjian watershed is divided into mainstream and tributaries. A multi-level ecological purification pond is constructed at the end of the main and tributary lakes. Through the comprehensive investigation and on-site investigation of the Longhongjian watershed, the water quality of the river basin is monitored regularly for one year. The results show that the influent water quality of Longhongjian Ecological Pond is in the condition of low carbon, low phosphorus and high nitrogen for a long time. Based on the principle of phytoremediation technology, the multi-stage ecological pond of Longhongjian can remove pollutants in water body through physical, chemical and biological purification. Among them, the average removal rate of TN,TP,NO3-N,COD in the main stream multi-ecologic pond is 42.5 and 42.80.The average removal rate of TN,TP,NO3-N,COD in the tributary multi-ecologic pond is 62.1 and 77.3 respectively. The average removal rate of TN,TP,NO3-N,COD in the main stream and tributaries is 42.5 and 42.80.The average removal rate of TN,TP,NO3-N,COD in the tributary multi-ecologic pond is 62.1and 77.30.The water quality of the main stream and the tributary meets the standards of Class V and Class 鈪，

本文編號：2221264