摘要
选取大肠杆菌和枯草芽孢杆菌分别代表自来水中易被灭活和不易被灭活的微生物,研究了紫外线的灭菌效果。结果表明:紫外消毒对大肠杆菌具有良好的灭活作用,当紫外剂量为10 mJ/cm2时,可以达到4.66个对数级的灭活效果;在相同的紫外剂量下,紫外强度对灭活效果也有一定的影响,在紫外强度较高时会取得较好的灭活效果;原水浊度对紫外灭活大肠杆菌有一定的影响,当浊度>4 NTU时会明显降低紫外线的灭菌效果,浊度物质的存在降低了水的透光率,从而使灭活效果降低。氯对枯草芽孢杆菌的灭活效果很差,在CT值为300(mg/L).m in时的灭活率也仅为0.53个对数级,紫外线对枯草芽孢杆菌灭活效果要明显高于氯,紫外剂量为40 mJ/cm2时对枯草芽孢杆菌的灭活率可达3.3个对数级。
E. coli and Bacillus subtilis were selected to express respectively the easily and difficultly inactivated microbe, and the effect of ultraviolet （UV） irradiation was studied. The result shows that UV disinfection is better for inactivation of E. coli, UV dosage of 10 mJ/cm^2 can achieve inactivation of 4.66 lg. Under the same UV dosage, UV intensity has some influences on the inactivation and higher UV intensity can get good inactivation effect. Turbidity of raw water also has influence on UV inactivation of E. coli, when turbidity is above 4 NTU, the inactivation effect of UV is reduced significantly due to the reduction of transmittancy of water. Chlorine has less effect on inactivation of Bacillus subtilis, the inactivation rate is only 0.53 lg with CT value of 300 （mg/L） ·min. UV irradiation is more effective than chlorine disinfection in inactivation of Bacillus subtilis, and the inactivation rate can reach 3.3 lg at UV dosage of 40 mJ/cm^2.
出处
《中国给水排水》
CAS
CSCD
北大核心
2005年第9期1-4,共4页
China Water & Wastewater
基金
高等学校全国优秀博士学位论文作者专项资金项目(200243)
