含沙量对水体耗氧有机污染物降解耗氧影响

The influence of sediment concentration in water on DO-consumption of biodegradable organic pollutants

在泥沙存在情况下,水体中的耗氧有机污染物的降解耗氧规律与清水中有很大的差异。从水体耗氧有机物降解反应动力学和溶解氧反应动力学方程出发,考虑泥沙对耗氧有机污染物降解的影响,得出了耗氧有机物降解过程耗氧量随时间变化表达式。通过室内实验研究了含沙量对耗氧有机污染物的耗氧规律的影响,利用耗氧量随时间表达式对实验数据进行分析,得出了泥沙影响下的耗氧有机污染物耗氧速率常数与含沙量的一般规律。结果表明,泥沙对耗氧有机污染物降解耗氧过程符合一级动力学反应,且耗氧速率常数随含沙量的增大而增大,由泥沙存在引起的溶解氧衰减速率常数与含沙量之间存在非线线的函数关系。

There are some different characteristics in the biodegradation law of DO-consumption organic pollutants due to the existence of sediment in water compared with those in clear water. In this paper, based on the dynamics equations of biodegradation reaction and DO reaction of DO-consumption organisms in water body, considering the influence of sediment on the biodegradation of DO-consumption organisms, the expression of DO-consumption quantity of biodegradable organic pollutants in the DO-consumption process with time is derived. Then laboratory experiments are carried out to study the influence of sediment concentration on the DO-consumption law of biodegradable organic pollutants. The expression of DO-consumption with time is used to analyze the observed data and a general law between the DO-consumption rate constant of DO-consumption organic pollutants under the influence of sediment and sediment concentration is obtained. The following conclusions are drawn: the DO-consumption process of biodegradation is in agreement with one-order dynamics reaction; the DO-consumption rate constant increases with sediment concentration; there is a non-linear function relationship between the DO-consumption decay rate constant due to sediment and sediment concentration.