几种常见氧化剂对水中摇蚊幼虫氧化杀灭效能的试验研究

进行了几种水处理氧化剂———氯气、二氧化氯、臭氧对水体中摇蚊幼虫灭活效果的试验研究,并对原水中摇蚊幼虫经二氧化氯预氧化、混凝沉淀后的灭活效果进行了考察.结果表明,二氧化氯对摇蚊幼虫的灭活效果受水体pH值、有机物含量和藻类含量影响较小,与其它2种氧化剂相比,二氧化氯对原水中摇蚊幼虫具有更好的灭活作用;混凝烧杯实验证实,原水中的摇蚊幼虫经混凝沉淀后,与矾花沉降,不会对沉后的水产生影响;并且二氧化氯投加量1.0mg·L-1时,摇蚊幼虫在24h内死亡,投加量2.0mg·L-1时,死亡时间为6h;采用预投二氧化氯的水处理工艺可以起到控制摇蚊幼虫在沉淀池中孳生的作用.

Experimental study on the inactivation effects of alternative oxidants on the Chironomid larvae

The inactivation effects of several oxidants, including chlorine, chlorine dioxide and ozone on the Chironomid larvae in source water were investigated. In addition, inactivation effect was also evaluated after pre-oxidation by chlorine dioxide, followed by coagulation and sedimentation for raw water. It was founded that chlorine dioxide possessed better inactivation effect than other two oxidants. And the organic matter concentration, pHvalue and algae concentration had little influence on the inactivation effect. The coagulation beaker test demonstrated that Chironomid larvae in the raw water could be deposited with floccules followed by coagulation and sedimentation process, and had no influences on sedimentation water. The Chironomid larvae would die within 24 h with the chlorine dioxide dose of 1.0 mg·L^-1, and within 6 h with the dose of 2.0 mg·L^-1. The excessive propagation of Chironomid larvae could be controlled effectively in sedimentation tank by chlorine dioxide pre-oxidation.