天然水体中颗粒悬浮物对有机污染水体系净化的实验模拟

The Laboratory Simulation of Sediments Scavenging for Organnic Pollutants in Nature Water

本文以上海竹圆地区苏州河底泥为研究对象,以化学耗氧量为主要的研究手段,进行了二部分的研究。第一部分研究了泥沙吸附有机污染物的最佳吸附量,最佳吸附酸度,最佳吸附时间和吸附饱和后泥沙的zeta电位,从而为第二部分的模拟实验选择最佳条件。通过实验得出:最佳吸附量3g/l(干重),最佳吸附酸度pH=7—9(与实际体系接近),最佳吸附时间1—3h,此时的CODcr去除率可达到50％,吸附饱和后的泥沙的等电点在pH=3左右,在pH=7—9的范围内zeta为15-20mv间,颗粒不稳定,易发生絮凝沉降。第二部分通过实验室模拟,研究了上海竹圆地区苏州河底泥对污水的降解,经过与无泥沙污水降解的对照,说明泥沙在天然水体自净化过程中所起的重要作用。实验表明,初始阶段,泥沙以吸附污水中的有机污染物为主,尤其在加入泥沙后的1—3h,这一现象更为明显,吸附饱和后,有机物的降解主要为附着在泥沙表面的各种微生物在起作用。

Using the sediments of suzhou river in shanghai zhuyuan area as objects and CODcr as mainly studying method , We go on the following two parts experiments. In the first part , study the optimum condition of sediments adsorption , including the adsorbance ,acidity ,ZETA potential in saturant state etc , preparing for the later laboratory simulation.In the second part , simulate the sewage (including sediments) degradation in the laboratory , contrasting by the sewage without sediments. As a result ,explain the sediments' funtion in scavenge of organic pollutants in natural water.