邕江南宁段水质现状及防治对策探讨

根据影响南宁地区最大的河流——邕江近年污染物排放状况和3个水质控制断面的氨氮、生化需氧量、高锰酸盐指数和石油类等监测资料进行初步分析,本文主要从水质现状、主要污染因子和污染原因考察了邕江的水环境状况。结果显示,邕江水质总体上属于II~III类水质,但部分断面有恶化趋势,主要是溶解氧和氨氮超标;主要污染物为石油类、氨氮、高锰酸盐指数和五日生化需氧量,这表明邕江的污染类型属于典型的有机型污染。同时,也指出了邕江水质污染特征和主要存在的问题,并根据南宁市水污染的成因和水污染因素的分析,提出了保护和改善邕江水质的建议。

CURRENT SITUATION AND PROTECTION MEASURES OF WATER QUALITY IN THE NANNING SECTION OF YONGJIANG RIVER

The Yongjiang River is the longest river in Nanning,which is very important to this area.The condition of effluent charges and the variation of water quality index including ammonia nitrogen,biochemical oxygen demand,permanganate value and petroleum of three sections in recent years in Nanning were preliminary studied in this paper.The water environment situation of the Yongjiang River was also reviewed in water quality actuality,the main pollution factors and pollution causes.The results showed that the overall water quality of the Yongjiang River met the water standards of the II to III grades.But some sections became worse and the main pollutants which caused aggravating pollution were ammonia nitrogen and dissolved oxygen.The main pollutants are petroleum,ammonia nitrogen,permanganate value,and biochemical oxygen demand of five days.This indicated that the pollution type of the Yongjiang River belongs to organic pollution.At the same time,the pollution characters and main problems existing in water quality of the Yongjiang River were brought forward.According to the causes of water pollution and main factors leading to pollution,water pollution prevention and harnessing countermeasures of the river were also put forward.