南方某供水水库氮磷入库污染分析及消减控制措施

Analysis of Nitrogen and Phosphorus Pollution in a Water Supply Reservoir in Southern China and its Reduction and Control Measures

对南方某高度城市化区域L水库各类氮磷入库污染源进行采样监测,对L水库氮磷污染负荷进行核算,结果表明,由于水库主要入库河流已经截排,当前L水库氮磷主要入库来源为外来引水工程,其NH_(3)-N、TN和TP污染负荷占比分别为98.66%、98.52%和96.53%,其余来自本地散流面源入库。基于L水库氮磷污染负荷核算结果,提出当前水库主要污染来源和入库污染消减控制措施——重点提高外源引水水质、截断不同类型散流面源入库途径、完善流域内污水管网、提高入库前置库面源污染收集净化能力,最终为L水库富营养化控制提供技术支持。

Sampling and monitoring were conducted on various nitrogen and phosphorus pollution sources entering the L reservoir in a highly urbanized area in the south.The nitrogen and phosphorus pollution load of the L reservoir was calculated.The results showed that due to the interception and discharge of the main inflow rivers of the reservoir,the main source of nitrogen and phosphorus entering the L reservoir is from external water diversion projects.The proportion of NH_(3)-N,TN,and TP pollution loads was 98.66%,98.52%,and 96.53%,respectively,while the rest came from local runoff sources entering the reservoir.Based on the calculation results of nitrogen and phosphorus pollution load in L reservoir,the main pollution sources and control measures for incoming pollution reduction in the reservoir are proposed,with a focus on improving the water quality of external water diversion,cutting off different types of scattered surface source inflow pathways,improving the sewage network in the basin,and improving the collection and purification capacity of surface source pollution in the pre inflow reservoir.Ultimately,technical support is provided for the eutrophication control of L reservoir.