烟台市辛安河口邻近海域水质评价及分析

Evaluation and Analysis on the Quality of the Sea Water Adjacent to the Yantai Xin'an River Estuary

根据2009～2011年烟台市辛安河口邻近海域的水质调查监测数据,采用单因子标准指数法和营养状况质量指数法分别对辛安河污水处理厂排污口和其邻近海域的水质进行评价,并进行了水质变化趋势、入海污染源及污染物特征分析.结果表明,辛安河污水处理厂排海污水没有超标项目,但COD、总磷的标准指数较高,除个别站位无机氮超标外,辛安河入海排污口邻近海域水质没有超标项目,COD的标准指数有降低的趋势.该海域为中营养化水平,营养状况指数NQI没有显著的趋势性变化,无机氮浓度较高,磷酸盐处于相对限制状态,海域有爆发赤潮的潜在风险.辛安河污水处理厂入海排污口和降雨季节辛安河入海径流是影响该海域水质的主要污染源.

According to the monitoring data about the quality of the seawater adjacent to the sea of Yantai Xin＇an River estuary in 2009~2011,the standard single factor index and the nutrition qualification index are used to evaluate the quality of the treated water from the outfall of Xin＇an River Sewage Treatment Plant and the seawater adjacent to it.At the same time,the changing trends of water quality,the resources of the pollution into the sea and the characteristic of the pollutant are analyzed.The results show that although the waste water from Xin＇an River Sewage Treatment Plant meets the standards,the standard index of COD and P are at a relatively high level.The quality of the seawater adjacent to the outfall basically meets the seawater quality requirements,except for some stations which has excessive emission of inorganic nitrogen and the standard index of COD tends to decrease.The water of the sea is in the moderate entrophication condition with no significant trend of the nutrition qualification index NQI.Since the concentration of inorganic nitrogen is relatively high and the amount of phosphate is relatively restricted,the sea is under the potential risk of the outbreak of the red tide.The outfall of Xin＇an River Sewage Treatment Plant and surface runoff of Xin＇an River during the rainfall seasons are the major sources of pollution to the sea water.