二氧化氯对水源水中摇蚊幼虫灭活效果的研究

采用二氧化氯和液氯灭活蒸馏水中的第1龄期摇蚊幼虫, 在此基础上, 考察了人工配水和天然原水中二氧化氯对1龄摇蚊幼虫的灭活特征,探讨了原水温度和pH值对二氧化氯灭活1龄摇蚊幼虫的影响.结果表明,与液氯相比, 二氧化氯对1龄摇蚊幼虫具有更好的灭活作用,投加量1.5mg/L,接触30min可以达到100%的灭活率; pH值在5.5~8.1变化对二氧化氯的灭活效果不会产生影响;二氧化氯对1龄摇蚊幼虫的灭活率随TOC的增加而降低;在10~30℃,温度升高能够提高二氧化氯的灭活效果,当原水温度从30℃降低到15℃时灭活率下降为84.5%.

Effects of chlorine dioxide on the inactivation of the chironomid larvae.

Comparative experiments on the inactivation of the first instar larvae of chironomid in distilled water by chlorine and chlorine dioxide were conducted. In addition, inactivation effects of chlorine dioxide on the first instar larvae of chironomid in artificial water and raw water were evaluated. And batch experiments were performed in order to analyze the influence of pH value and temperature on the inactivation efficiency of chironomid larvae with chlorine dioxide. Chlorine dioxide possessed better inactivation effect than chlorine and complete inactivation of chironomid larvae was obtained at dose of 1.5mg/L of chlorine dioxide with 30min disposal. The pH value in range of 5.5~8.1 did not affect the inactivation efficiency of chlorine dioxide. The inactivation efficiency of chironomid larvae decreased as TOC concentration increased. With regard to the temperature, the inactivation efficiency of chironomid larvae was significantly improved with the temperature increasing within the range of 15~30℃. The inactivation rate was reduced to 84.5% when temperature reduced from 30℃ to 15℃.