海河干流水质现状评价

Current Water Quality Evaluation of Haihe River Main Stream

采用单因子评价法和水污染指数法对2021年海河干流上7个点位进行取样分析,监测项目为《地表水环境质量标准》(GB3838-2002)表1中的24项评价指标。对海河干流各断面的年均值进行评价,并进行枯水期和丰水期对比。结果表明,海河干流水质2021年比2016年得到了显著改善,2021年海河干流上游水质平均值符合地表水Ⅲ类标准,完成水功能区水质达标要求;下游全年水质劣于Ⅴ类标准。丰水期受雨后排污影响,上游水质劣于枯水期,下游水质优于枯水期。海河干流的主要污染物为化学需氧量。

The single factor evaluation method and water pollution index method were used to sample and analyze 7 points on Haihe River main stream in 2021.The monitoring items were 24 evaluation indexes listed in Table 1 of“Surface Water Environmental Quality Standard”(GB 3838-2002).The annual mean value of each section of Haihe River main stream was evaluated and compared between dry season and wet season.The results showed that the water quality of Haihe River main stream in 2021 was significantly improved compared with that in 2016.The average water quality of The upper reaches of Haihe River main stream in 2021 met ClassⅢwater quality standard of surface water,fulfilling the water quality standard of the water functional area.The downstream water quality was worse than the ClassⅤwater quality standard.In the wet season,affected by pollution discharge after rain,the upstream water quality was worse than that of dry season and the downstream water quality was better than that of dry season.The main pollutant in Haihe River main stream is chemical oxygen demand.