城市浅水型湖泊底泥污染物释放过程模拟试验研究

通过对城市浅水型湖泊(以宁波东钱湖为例)疏浚后上层底泥污染物释放过程模拟试验研究,分析了环境因子对底泥污染物释放特性的影响及其原因,得出了上覆水营养盐水平、水温和扰动对底泥污染物释放的影响曲线.同时,说明了湖泊内源性有机污染源对湖泊水质存在着潜在的危险性,提出了疏浚施工期间的规避措施,为城市浅水型湖泊底泥疏浚和富营养化治理提供依据.

Release of organic pollutants and nutrients from sediments of an urban shallow lake

Series of experiments were conducted to study the organic pollutants(TOC)and nutrients(TP and NH3-N)released from the upper sediment after dredging in Dongqian Lake,an urban shallow lake in Ningbo.Effects of dilution(salt level),disturbance(movement)and temperature of the cover water on its TOC,TP,and NH3-N concentration profiles were determined in the lab test runs simulating the field conditions.The experimental results have demonstrated that the lake sediment may release enough organic pollutants and nutrients to adversely affect the lake water quality.Preventative measures are proposed for sediment dredging and eutrophication control of urban shallow lakes.