城市污水与海水混合过程中有机污染物的转移

Transfer of organic pollutants during sewage and seawater mixing

以3种不同混合体系模拟研究了城市污水与海水混合过程中有机污染物的转移。在“污水颗粒物-过滤海水”体系中，颗粒态有机物有一定的释放，释放率约在0．02～0．04d-1之间。释放过程可用交换平衡动力学模式描述。在“天然海水-过滤污水”和“海水-污水”混合体系中，未发现有机污染物有明显的吸附或释放。在这3种混合体系中均发现化学耗氧量（COD）的降解现象，降解过程符合一级动力学方程，降解速率常数在0．04～0．07d－1之间。

The transfer processes of organic pollutants during the mixing of sewage and seawater were simulated by three different mixing systems, followed preliminarily the following re sults. A certain release of particulate organic materials is found in sewage particle-filtered seawater system. The release processes can be formulated by [t/X (t) ] = [t/X (eq) ] + B' and the estimated equilibrlum release of organic pollutants approximates to that of determina tion. The release rate is between 0. 02~0. 04d'-1 Neither adsorption nor release is observed in nature seawater-filtered sewage system and seawater-sewage system. Biochemical degrada tion of COD is found in all the three mixing systems. The degradation follows the first order reaction kinetics: ln c= -kt + B and the value of k falls between 0. 04 and 0. 07d-1 in the experi mental conditions.