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为研究O3在水体中杀灭贾第虫的效果,利用荧光活体染色法探讨了不同因素(CT值、pH值、温度、浊度、有机物含量和无机离子等)对O3灭活贾第虫效果的影响.结果表明,O3灭活贾第虫整个过程可分为指数和缓慢灭活期,指数灭活期反应速度明显快于缓慢灭活期[k1=(5.64±0.023)×10-1mg·min,k2=(2.72±0.002)×10-2mg·min,k1>>k2];浊度0.1～20NTU,温度5～35℃,pH值6.0～9.0,HA在0.5～10.0mg/L浓度范围内,浊度越低,灭活效果越好;随温度上升,O3灭活贾第虫的能力减弱;酸性较碱性条件下臭氧杀灭贾第虫的能力更强;有机物浓度越高,在反应体系中与贾第虫发生了竞争作用,降低了灭活率;水中阴离子对灭活率的影响次序为:NO3->None>SO24->HCO3-,而阳离子(Ca2+、Mg2+和Cu2+)均对灭活起到一定促进作用;当臭氧CT值≥15.0min·mg/L,在饮用水消毒的浊度、温度、pH值、有机和无机杂质浓度范围内,贾第虫的灭活率均在99.0%以上.
In order to study the effect of O3 in killing Giardia in water, the effects of different factors (CT value, pH value, temperature, turbidity, organic content and inorganic ions) on the inactivation of Giardia in O3 were investigated by fluorescence in vivo staining The results showed that during the whole process of O3 inactivation Giardia was divided into index and slow inactivation period, the response speed of the index inactivation phase was significantly faster than that in slow inactivation period [k1 = (5.64 ± 0.023) × 10-1mg · min, k2 = (2.72 ± 0.002) × 10-2mg · min, k1 >> k2]; turbidity 0.1-20NTU, temperature 5-35 ℃, pH 6.0-9.0, HA concentration 0.5 ~ 10.0mg / L The lower the turbidity, the better the inactivation effect. With the increase of temperature, the ability of O3 to inactivate Giardia was weakened; the ability of ozone to kill Giardia in acidic condition was stronger; the higher the organic concentration, The reaction system with Giardia had a competitive effect, reducing the inactivation rate; water anions on the inactivation rate of order: NO3-> None> SO24-> HCO3-, while the cation (Ca2 +, Mg2 + and Cu2 + The inactivation rate of Giardia was positively correlated with the inactivation rate when the CT value of ozone was ≥15.0min · mg / L, and the turbidity, temperature, pH, and organic and inorganic impurity concentrations of drinking water disinfection At 99 .0% or more.