摘要
根据南四湖主要河流入湖口水质空间分布监测数据,按平均综合污染指数Pj>2的标准共筛选出洸府河和薛城小沙河等17条重污染河流,这些河流CODcr、TP、TN的单项污染贡献率平均值依次为45.5%、76.3%、86.4%,说明南四湖TN和TP主要来自于重污染河流,CODcr、TP、TN的单项污染分担率平均值依次为22.7%、15.4%、61.9%,说明南四湖的首要入湖污染物是TN,其次是CODcr和TP。给出了南四湖湖东区入湖河口NH3-N与TN的线性回归方程,受湖西与湖东地形地势、河流形态、水力停留时间以及水体中pH、SS、叶绿素a等多种因素的影响,湖西比湖东河流的硝化过程较完全,湖西区和湖东区入湖河口氨氮与总氮的平均比值分别为0.25和0.65。分析表明,重污染河流的汇水区域一般都在主要城镇和工矿区分布,CODcr和氮污染物主要来自于工业和城市生活等点污染源,磷污染物主要来自于部分工业行业。因此,加强南四湖流域的工业结构调整、重点企业截污和城市污水处理厂脱氮除磷等点源控制措施仍是重中之重。
Based on monitoring data of spatial distribution of water quality in main inflow estuary of Nansi Lake,according to the standard of average comprehensive pollution index Pj2,17 heavily-polluted rivers such as Guang Fu river and Xuecheng Xiaosha River etc.were selected.The average value of individual soiled contribution rates of CODcr,TP,TN of these rivers were 45.5%,76.3%,86.4% respectively,indicating that TN and TP in Nansi lake were mainly from the heavily-polluted rivers.The average value of individual soiled share rates of CODcr,TP,TN were 22.7%,15.4%,61.9% respectively,indicating that the primary pollutant in Nansi Lake was TN,and the following were CODcr and TP.The paper gave the linear regression equations of NH3-N and TN in inflow estuary of east Nansi Lake.Affected by topography,river morphology,hydraulic retention period as well as pH,SS,chlorophyll-a and other factors in water of the west and east lake,the nitrification processes of rivers in the west lake are better than those in the east lake,and the average ratio of NH3-N and TN in inflow estuary of west and east Nansi lake were 0.25 and 0.65 respectively.The result showed that,the catchment areas of heavily-polluted rivers generally distribute in major towns and industry and mine areas,CODcr and nitrogen pollutants were mainly from point pollution sources such as industry and urban life,and phosphorus pollutants were mainly from part of the industry.Therefore,the highest priority is to strengthen control measures of point sources such as industrial structure adjustment,emphasize enterprise cutting down pollution as well as remove nitrogen and phosphorus in municipal waste water treatment plant in Nansi Lake basin.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2011年第4期475-481,共7页
Resources and Environment in the Yangtze Basin
基金
国家水体污染控制与治理科技重大专项(2009ZX07210-007)
关键词
南水北调
南四湖
入湖河流
重污染筛选
水质评价
水环境问题分析
the South-to-North Water Transfer Project
Nansi Lake
inflow rivers
filtration of heavily-polluted
evaluation of water quality
analysis of water environmental questions
