汤河水库底泥COD释放规律试验研究

Experimental Study on COD Release in Sediment of Tanghe Reservoir

采用室内模拟方法,研究了汤河水库底泥在不同浓度、温度、pH值、扰动、溶解氧条件下COD的释放特征。结果表明:河水COD浓度较高时,底泥仍会吸附有机污染物,成为有机污染物的"汇";升高或降低原水的温度,COD的释放量增加,所以维持常温可抑制COD的释放;水体pH值为8时有利于水体的稳定;扰动使得COD释放强度增大;贫氧条件可以促进底泥COD的释放。

The character of chemieal oxygen demand （COD） release in the sediment of Tanghe Reservoir was studied in different concentration, temperatures, pH value, disturbance, and dissolved oxygen conditions through indoor simulation experiment. It is concluded that sediment can adsorb more organic pollutants when the river is at a higher COD eom：entration conditions lwhether temperature is raised or lowered, the COD emission increases, so the maintenance of temperature can inhibit the release of COD in water; when pH value equals 8, it is helpful for water stability ; disturbance significantly increases the released quantity of COD and low dissolved oxygen can promote release of COD.