城市污水厂尾水氯消毒及其余氯控制技术

Technique Development on the Control of the Toxity of the Residual Chlorine from Wastewater Disinfection

论述了城市污水消毒处理的必要性。预见在相当长一段时间内氯消毒将是我国城市污水消毒处理的重要方法。阐明了氯在杀死细菌的同时产生具有三致作用的消毒副产物,并且在尾水排入水体后,余氯会对水体生物体产生持续的毒性影响,为保护水生生物,需在氯化消毒后加以脱氯。对各种脱氯药剂进行分析,并指出氯化—脱氯工艺的不足,提出对于我国城市污水厂消毒工艺的建议。

This paper discussed the necessity of wastewater disinfection.It fingered that chlorine will be the most important disinfectant for a long time.But disinfection byproducts (DBPs) can be produced while chlorine inactivate the bacteria and the residual chlorine will be toxic to the aquatic microorganism persistently,so the deehlorination is necessary after chlorination.According to the analysis of several dechlorination reagents,the imperfection of dechlorination technology is presented.Furthermore it gave some advice on the wastewater disinfection in China.