武汉市沙湖纳污口水环境研究

Water environment of Shahu's sewage outlet in Wuhan

参照国内外有关湖泊水环境状况的研究,对湖北大学纳污口(排入沙湖)和沙湖水质进行实验监测研究,分析沙湖各水质参数之间的定量关系,并参照《地表水环境质量标准》(GB3838-2002)对湖北大学纳污口所排污水水质作了定量的评价,以及应用综合营养状态指数法对沙湖水体的富营养化程度进行评价.结果表明:(1)湖北大学纳污口所排出废水的各项主要指标均超标,特别是氨氮(NH3-N)、总磷(TP)、化学需氧量(CODcr)指标均严重超标;(2)沙湖水体的化学需氧量、五日生化需氧量(BOD5)、氨氮、总氮(TN)、总磷(TP)等指标严重超标,有的已达Ⅴ类、甚至是劣Ⅴ类水质,这与沙湖的功能区划的Ⅳ类水质不相符合;(3)沙湖中总磷(TP)平均浓度与生物量的代表参数叶绿素a(ch1 a)之间存在明显的正相关关系;(4)沙湖水体已达中度富营养化,水质情况比较差,尤其是枯水期的富营养化程度明显比平水期、丰水期严重.

Based on researches of domestic and international relevant lakes, we did the experiments of Shahu＇s sewage outlet. Dependent on ＂Ground water environmental quality standard ＂ （GB3838-2002 ）, the quantitative relationship among different water quality index of Shahu and and water eutrophication were analysed. There were some results： （1）The major waste water index of the sewage outlet exceeded standard values, especially NH3-N, TP, CODcr; （2）Observed data of CODcr, BOD5, NH3-N, TN and TP of Shahu were larger than corresponding standard values greatly, some index have already reached Ⅴ, or even lower than Ⅴ, that did not accord with water quality Ⅳ of function section of Shahu; （3）There were the significantly positive correlation between TP and chl a; （4） Shahu has already reached middle eutrophication level, and the eutrophication value in dry season is obviously much higher than that in wet season.