含沙水体污染物生物降解反应动力学研究

Biodegradation reaction kinetics of pollutants in water body with sediment

以含多组分的生活污水为模拟污染物,通过实验方法对含沙水体中污染物生物降解规律进行了研究,得出了污染物生物降解速率常数与含沙量的关系式。研究结果表明:(1)低浓度污染物在含沙水体中的生物降解过程符合一级反应动力学过程;(2)对同一粒径组泥沙而言,含沙量越大,污染物生物降解速度越快。即泥沙的存在促进了污染物的降解;(3)污染物生物降解速率常数随着含沙量的增大而增大,两者存在非线性的函数关系。含沙量增大到一定值时,降解速率常数趋于最大值。

In this paper, the domestic wastewater, a multi-component mixture, is used as the simulated pollutants, and two groups of fine sediment with different size as the experiment materials. Some experiments are conducted to study the biodegradation reaction kinetics of pollutants in water with sediment, and the expression between the biodegradation rate constants and sediment concentration is established. The analysis of experiment results show that： ① the biodegradation process of low concentration pollutants in water with sediment can be expressed by one-order reaction kinetics, ② in the water with the same group sediment, the greater sediment concentration is, the faster the pollutants are biodegraded, which means that sediment accelerates the biodegradation of the pollutants, and ③ the biodegradation rate constant increases and reaches the maximum with increasing sediment concentration, and there is a nonlinear function between them.