臭氧灭活水中铜绿微囊藻影响因素研究

为研究臭氧在水体中杀灭铜绿微囊藻的效果,利用中性红染色法探讨了不同因素(臭氧投量、作用时间、pH值、温度、浑浊度、初始藻细胞密度等)对臭氧灭活铜绿微囊藻效果的影响.结果表明,随着臭氧投量和作用时间的延长,藻灭活率明显增加.当浑浊度0.5~20NTU,温度5~35℃, pH值6.0~9.0,同时浊度越低,灭活效果越好;随温度上升,臭氧灭活铜绿微囊藻能力减弱;碱性较酸性条件下臭氧杀灭铜绿微囊藻的能力更强.藻样初始浓度对杀藻效果影响较大,细胞密度增大,杀藻效果急剧下降.当初始藻细胞密度为1.0×107cells/L,臭氧投量为2.0mg/L,作用时间40min以上时,在饮用水消毒的浊度、温度、pH值范围内,铜绿微囊藻的灭活率在99.0%以上,繁殖能力降低到0.

Effect of various factors on ozone inactivating Microcystis aeruginosa in water

In order to study the effect of O3 inactivating Microsystis aeruginosa in water,different factors(the ozone dose,time,pH,temperature,turbidity and cell density) which might influence the inactivation were investigated by using neutral red staining assays.The results indicated that the inactivated rate of O3 affecting Microsystis aeruginosa increased as the ozone dose and time prolonging obviously.When the turbidity was 0.5 to 20.0NTU,temperature was 5 to 35℃,pH was 6.0 to 9.0,the turbidity was lower,the higher inactivating ratio could be received.With the increasing of temperature,the inactivating effect was decreased.The ability of O3 inactivating Microsystis aeruginosa was stronger under acidic condition than it was in alkali circumstance.If cell density increased,the inactivation efficiency decreased significantly.The initial algal concentration also influenced the treatment efficiency.If cell density increased the inactivation efficiency decreased significantly.If the initial algal concentration was 1.0×107 cells/L,the ozone dose 2.0 mg/L and the time was more than 40 min,the ratio of inactivation could exceed 99.0% and the capability of propagator was zero during disinfecting drinking water.