辽河盘锦段水体污染特征和自净行为研究
发布时间:2019-02-19 09:40
【摘要】:辽河盘锦段,地处辽河三角洲,是辽河湿地的重要水生态系统。过去,由于盲目追求经济发展,忽视对环境的治理,该河段污染较严重。近年来,随着政府对水环境问题的重视,辽河盘锦段水污染得到了遏制。尤其是2005以来,辽河流域的水质逐渐转好,截止到2014年,主要干流断面兴安断面、曙光大桥、赵圈河断面的水质由劣Ⅴ类转变为Ⅳ类水质。为了使辽河盘锦段水质得以持续改善,需要研究辽河盘锦段水体的污染特征与自净行为,为地区排放总量的制定提供参考。根据此,本文首先调查盘锦段水质现状、周边环境以及盘锦段所在地城市发展情况;然后利用主成分分析法对枯、丰、平三个水期进行污染状况评估,进而得出三个时期水中污染物组分的不同比例,确定不同时期的主要污染指标。调查辽河盘锦段附近的各个污水处理厂在排放源头的初始污染物浓度及在水体中监测的水质指标浓度,确定污染物削减量,利用水质模型求出2013年水环境容量值,发现实际排污量小于水环境容量,说明水体自净作用对污染物削减起很大作用。为了评估辽河盘锦段的自净行为,以2007-2013年期间的一维水质模型为基础,设置耗氧系数和复氧系数两个关键参数,得出辽河盘锦段水体自净系数,确定水体自净对水体污染物削减的贡献。结果表明:辽河盘锦段水体自净系数逐年增大,说明辽河盘锦段水体自净作用正在提升,水体自净作用对于降低河流污染物浓度的贡献增大。
[Abstract]:Panjin section of Liaohe River, located in Liaohe Delta, is an important aquatic ecosystem of Liaohe wetland. In the past, due to blind pursuit of economic development and neglect of environmental control, the river was polluted seriously. In recent years, water pollution in Panjin section of Liaohe River has been restrained with the government paying more attention to water environmental problems. Especially since 2005, the water quality of Liaohe River basin has gradually improved. By 2014, the water quality of the main stream section Xingan section, Shuguang Bridge and Zhaoquan River section has changed from bad 鈪,
本文编号:2426379
[Abstract]:Panjin section of Liaohe River, located in Liaohe Delta, is an important aquatic ecosystem of Liaohe wetland. In the past, due to blind pursuit of economic development and neglect of environmental control, the river was polluted seriously. In recent years, water pollution in Panjin section of Liaohe River has been restrained with the government paying more attention to water environmental problems. Especially since 2005, the water quality of Liaohe River basin has gradually improved. By 2014, the water quality of the main stream section Xingan section, Shuguang Bridge and Zhaoquan River section has changed from bad 鈪,
本文编号:2426379
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