原位电解活性氯溶液对细菌消毒性能观察

Disinfection effect of typical bacteria in water by electrochemical method

目的探索原位电解活性氯溶液对水中3种指示细菌的消毒效果和相关影响因素。方法采用间歇式电解槽制备活性氯溶液,并对菌悬液进行电解试验;改变试验参数探索不同因素对杀灭率的影响,并对大肠埃希菌、金黄色葡萄球菌和枯草杆菌黑色变种芽孢3种指示菌的消毒效果进行对比。结果在试验范围内,原位电解活性氯溶液对3种试验菌的杀灭对数值与极板间距和pH值有负相关关系,与电解液浓度和外加电压有正相关关系。间歇式电解槽的极板间距为3 mm、电解液浓度为4%、pH值为7、电压为13 V时对大肠埃希菌、金黄色葡萄球菌和枯草杆菌黑色变种芽孢3种细菌消毒20 s的杀灭对数值分别为7.0、4.7和2.4,该条件下所制得的消毒剂有效氯浓度为9.2 mg/L,消毒效果远高于相同有效氯浓度下的次氯酸钠溶液。结论原位电解活性氯溶液可以有效灭活水中微生物。

Objective To explore the on-line disinfection effect and related influencing factors of in-situ electrolytic active chlorine solution on three indicator bacteria in water.Methods Using intermittent electrolyzer to electrolyze the bacterial suspension and explore the effects of different factors on the disinfection rate by changing test parameters.Comparing the inactivation effects on three indicator bacteria:Escherichia coli,Staphylococcus aureus and Bacillus subtilis.Results Within the experimental range,the killing log value of three bacteria had a negative correlation with plate spacing and pH value,and a positive correlation with electrolyte concentration and applied voltage.When the electrode spacing of the intermittent electrolyzer was 3 mm,the electrolyte concentration was 4%,pH was 7,and the voltage was 13 V,the killing log value of Escherichia coli,Staphylococcus aureus and Bacillus subtilis var.niger were 7.0,4.7 and 2.4,respectively when decontaminated for 20 s.The effective chlorine concentration of the decontaminant prepared under this condition was 9.2 mg/L,which effect was far higher than that of sodium hypochlorite solution under the same effective chlorine concentration.Conclusion In-situ electrolysis of active chlorine solution can effectively kill microorganisms in water.