| Volatile organic compounds (VOCs) have become a major pollutional source in the field of sources water. Most volatile organic compounds are poison and they have been proved to be a serious threat to drinking water supply. In this paper, Chlorobenzene is chosen to act as a representative of them. In the case of sudden pollution of chlorobenzene, how to removal the residual chlorobenzene in water fast and effectively is studied.This paper investigated the main factors about the kinetics of stripping chlorobenzene, which included aeration head, the initial concentration of cholorbenzene, gas-flow rate of unit area and temperature. The turbidity of source water and chorobenzene coexisted with other VOCs were preliminary study influence on the removal of chlorobenzene respectively. The optimum parameters of aeration and stripping chlorobenzene also were investigated with continuous flow experiments, so as the mathematical model of the removal rate. It also gave analysis about using stripping to remove chlorobenzene in water plants' distribution well and stripping pool.The results show that stripping can satisfy the first order equation. Aeration head, gas-flow rate of unit area and temperature of water have strong effect on the removal of chlorobenzene, and the initial concentration of cholorbenzene has little. The aeration head is better with small pore diameter and large porosity. When temperature is increased from 0 to 30℃, the removal rate constant grows from 0.1886 min-1 to 1.0465 min-1; When gas-flow rate is increased from 0.37 m3/(m2.min) to 1.1 m3/(m2.min), the removal rate constant grows from 0.2325 to 0.4213 min-1. Turbidity slightly effects on the removal of chlorobenzene. Chorobenzene coexisted with benzene and ethylbenzene respectively, can promote the removal of chlorobenzene and chlorobenzene with benzene become more effective. During the process of continuous flow stripping, the best air-water ratio is 10.Under this condition, the removal rate can reach more than 50% in room temperature. The mathematical model of the removal rate is preferable to calculate experimental results. Distribution well can be chosen as a stripping structure, aeration and stripping method can handle the chlorobenzene concentration of 1.36mg/L in the room temperature. The maximum concentration of chlorobenzene is 14.9mg/L when stripping is combined with activated carbon adsorption.In all, Aeration and stripping technology was an effect emergency treatment technology to deal with the sudden pollution caused by chlorobenzene for water plants. |
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