二氧化氯灭活供水系统中摇蚊幼虫的实验研究

Inactivation effect on Chironomid larvae by chlorine dioxide

摇蚊幼虫经常污染城市的供水系统,成为饮用水安全面临的新问题.在实验室条件下,使用二氧化氯对其进行灭活试验,得出不同浓度、pH值和接触时间下的灭活效果,并针对源水进行了灭活.对二氧化氯灭活机理及动力学进行了初步探讨.研究表明,二氧化氯在蒸馏水中投量为9 m g.L-1时,接触30 m in后可达到100%的灭活;二氧化氯灭活效果受接触时间影响较大,受pH值影响较小;摇蚊幼虫被100%灭活时,最佳CT(化学药剂浓度C与接触时间T的乘积)值为400—600 m g.m in.L-1,此时二氧化氯最低投量为5 m g.L-1.

The emergence of chironomid larvae in the water treatment units has been bothering the water supply system in these years. Chlorine dioxide was used to kill the larvae in the lab,under the condition of different dosage, pH and contact time. In addition, inactivation effect on chironomid larva in raw water was investigated. The inactivation mechanism and dynamics was also discussed. The results showed that complete inactivation rate was obtained under the does of 9 mg · L^-1 of chlorine dioxide with 30 min contact time . It was found that the pH value has little influence on the inactivation effect of chlorine dioxide. Contact time greatly affected the inactivation effect. To kill all the chironomid larvae, the optimum CT（multiplication of dosage C and contact time T） value was 400--600 mg · min · L^-1,while the lowest chlorine dioxide concentration was 5 mg · L^-1.