摘要
以枯草杆菌黑色变种芽孢为目标微生物,以紫外线消毒后的炭滤池出水为进水,在中试清水池模型中模拟氯消毒过程,通过改变清水池导流板数目获得不同的水力条件,研究清水池水力条件对氯消毒效率的影响.结果表明,在本试验中,不同水力条件下以Ct10值计算的NaClO对枯草杆菌黑色变种芽孢的灭活系数之间相互一致,而不同水力条件下以CT值计算的NaClO对枯草杆菌黑色变种芽孢的灭活系数之间相差很大,表明Ct10是评价清水池消毒效率的合理指标;在Ct10=（100-300）mg.min/L的范围内,NaClO对枯草杆菌黑色变种芽孢的灭活系数为0.0016 L/（mg.min）,与其他研究者的结果具有很好的一致性;清水池水力条件的改善可以提高消毒效率,在CT=（100-700）mg.min/L的范围内,当CT值固定时,随着清水池内导流板数增多,水力条件得到改善,t10增加,目标菌种的灭活率显著提高.
A pilot clearwell was used to simulate the chlorine disinfection process with the Bacillus subtilis spores as the target microbe.The effluent of the activated carbon filter tank was radiated by low pressure UV lamp and then used as the influent the pilot clearwell.The impacts of hydraulic characteristics of pilot clearwell on disinfection efficiency of Bacillus subtilis spores was studied under different hydraulic characteristics which was changed by the number of the baffles.Under the conditions of this experiment,the inactivation coefficients of Bacillus subtilis spores with NaClO as disinfectant which were calculated by Ct10 value were almost same under different hydraulic characteristics,but the inactivation coefficients which were calculated by CT value were very different under different hydraulic characteristics.This verified that it was more reasonable to evaluate the disinfection efficiency by Ct10 value than CT value.When Ct10 value was in the range of 100～300mg·min/L, the inactivation coefficient of Bacillus subtilis spores with NaClO as disinfectant was 0.001 6 L/（mg·min）, which highly coincided with others＇ results.When CT value was in the range of 100～700mg·min/L, under the same CT value,the disinfection efficiency of target microbe would be notably enhanced by increasing the number of baffles which would improve the hydraulic characteristics.So the results verified that the disinfection efficiency could be enhanced by improving the hydraulic characteristics of the clearwell
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第9期2550-2554,共5页
Environmental Science
基金
国家自然科学基金项目(50778096)
关键词
清水池
水力条件
有效水力停留时间
消毒
枯草杆菌黑色变种芽孢
clearwell
hydraulic characteristics
effective hydraulic retention time
disinfection
Bacillus subtilis spores
