杭州西湖龙泓涧多级生态净化塘水质评价与水环境解析
发布时间：2018-09-04 06:18
【摘要】：龙泓涧是杭州西湖上游重要的入湖溪流之一,作为西湖营养盐的重要来源,龙泓涧流域水质对西湖水质产生很大的影响。龙泓涧流域分为主流和支流,在主、支流入湖末段构建有多级生态净化塘,通过对龙泓涧流域进行全面调研和现场勘查,以及对其水质一年的定期监测,分析其水体特征及变化规律,结果显示龙泓涧生态塘进水水质长期处于“低碳、低磷、高氮”状况。龙泓涧多级生态塘利用植物修复技术原理,通过对水体中的污染物进行物理、化学、生物等净化作用,使得水体中污染物得以去除。其中,主流多级生态塘对水体中TN、TP、NO3-N、COD的平均去除率为42.5%、42.8%、52.9%、52.6%,支流多级生态塘对水体中TN、TP、NO3-N、COD的平均去除率为62.1%、77.3%、69.3%、59.6%,主、支流出水水质分别满足《地表水环境质量标准》(GB3838-2002)Ⅴ类和Ⅳ类标准。此外,采用综合营养状态指数法对生态塘水质进行富营养化评价分析,结果表明,龙泓涧主流生态塘水体处于中度富营养化水平,支流生态塘水体处于轻度富营养化程度。在水体水量平衡分析的基础之上,通过建立污染物净积累量(NPA)数学模型,对主、支流生态塘水体污染物年总量进行计算分析,确定出主流生态塘COD、TN和TP的年净积累量分别为:11696kg、3759kg和35.7kg;支流污染物COD、TN和TP的年净积累量分别为:12360kg、3340kg和91.3kg,求解出的NPA结果表明生态塘对水体污染物强大的截留能力。以TN作为分析因子,建立一维水质模型,计算出主流生态塘的环境容量为12.67t/a,现状环境容量为21.17t/a,其现状容量已远远超过生态塘水环境容量允许值;支流生态塘的水环境容量为36.95t/a,现状容量为35.06t/a,暂且未超出生态塘的纳污能力。通过对龙泓涧主、支流生态塘水体的富营养化评价、水质现状评价以及水环境解析,依据分析结果,可全面掌握生态塘的水体水质污染状况及主要污染物,对龙泓涧水质的有效控制及管理提供一定的科学依据。
[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，
本文编号：2221264
[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，
本文编号：2221264
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