石洞口污水处理厂水域水质状况调查与影响分析

A Survey and Evaluation on Quality of the Water Body around Shidongkou Sewage Treatment Plant

初步调查了石洞口污水处理厂水域水质状况，采用多元统计分析中非度量多维尺度分析（Nonmetric Multidimensional Scaling，NMDs）对石洞口附近水域各站位的多维度特征进行分析，综合评价了石洞口污水处理厂排污对周边水域的影响。结果表明：调查区域水质总体状况良好，大部分水质指标达到了地表水环境质量标准（GB3838-2002）Ⅱ类水水质标准，主要超标项目为氨氮、总磷、挥发酚、石油类，阴离子表面活性剂和粪大肠菌群。排污口附近部分污染物浓度高于其他站位，同时，上游存在部分指标的高浓度区。从统计学角度看，石洞口处理厂排污口排污对周边水域有一定的影响，但影响很小。

A preliminary survey on the water body of Yangtze River estuary around Shidongkou Sewage Treatment Plant in Shanghai was conducted, and effects of the effluent discharge of the sewage treatment plant on surrounding waters had been analysed by using nonmetric multi-dimensional scaling （NMDS）. Results of the evaluation showed that overall quality of the water body around Shidongkou Sewage Treatment Plant was fairly good, and most of the water quality indices were in compliance with the Category I! requirements of Environmental Quality Standard for Surface Water （GB 3838-2002） whilst ammonia nitrogen, total phosphorus, volatile phenols, petroleum, anionic surfactants, and fecal coliform were the major pollutants. Some of pollutants around the outfall had higher concentrations than elsewhere but there were a few zones with higher content of water quality variables in the upper reaches. In the view of statistics, the discharge of Shidongkou Sewage Treatment Plant had likely but a little impact on the surrounding waters.