银离子-紫外线联合消毒的生活热水微生物灭活效能

发布时间：2019-02-22 20:23

【摘要】：采用建筑生活热水管道模拟实验系统,研究了银离子、银离子-紫外线联合消毒对微生物的灭活效能.结果表明,银离子投量对微生物灭活效能有显著影响,0.05mg/L银离子消毒60min时可达到极佳的微生物灭活效果.银离子投量较低时,增加消毒时间仍可达到相同的消毒效能.银离子的总大肠菌群灭活速率较低,需要保证足够的浓度和消毒时间(CT)值.银离子浓度的衰减速率慢,对生活热水生物膜微生物的高效持续消毒作用可保持48h以上.紫外线消毒、银离子消毒和银离子-紫外线联合消毒均可在很短的时间内对生物膜结构造成显著破坏,使生物膜出现脱落现象,其中紫外线消毒对生物膜结构的影响最小,银离子-紫外线联合消毒的影响最大.生物膜的16s r DNA测序分析表明,银离子消毒对病原微生物的灭活程度相对较低,紫外线消毒、银离子-紫外线联合消毒对病原微生物的灭活程度较高.银离子-紫外线联合消毒技术可充分发挥紫外线原位消毒和银离子持续消毒的特点,全面提高生活热水生物膜微生物消毒效能,是一种有应用价值的生活热水消毒和水质保障技术.
[Abstract]:The inactivation effect of silver ion, silver ion and ultraviolet ray disinfection on microorganism was studied by using the simulated experiment system of building hot water pipe. The results showed that the dosage of silver ion had a significant effect on the inactivation efficiency of microorganism, and 0.05mg/L silver ion disinfection of 60min could achieve a very good effect of microbial inactivation. When the dosage of silver ion is low, the same disinfection efficiency can be achieved by increasing the disinfection time. The inactivation rate of total coliform group of silver ion is low, so it is necessary to ensure sufficient concentration and (CT) value of disinfection time. The decay rate of silver ion concentration was slow, and the high efficient and continuous disinfection effect of biofilm microorganism in domestic hot water could be maintained for more than 48 hours. Ultraviolet disinfection, silver ion disinfection and combined silver ion-ultraviolet disinfection can significantly destroy the biofilm structure in a very short period of time and cause the biofilm to fall off, among which ultraviolet disinfection has the least influence on the biofilm structure. The effect of combined disinfection of silver ions and ultraviolet rays was the greatest. The sequencing analysis of biofilm by 16s r DNA showed that the degree of inactivation of pathogenic microorganisms by silver ion disinfection was relatively low, and the degree of inactivation of pathogenic microorganisms by ultraviolet disinfection and combined disinfection of silver ion and ultraviolet ray was higher. The combined disinfection technology of silver ions and ultraviolet rays can give full play to the characteristics of ultraviolet in situ disinfection and continuous disinfection of silver ions, and improve the efficacy of microbial disinfection of domestic hot water biofilm. It is an applied hot water disinfection and water quality assurance technology.
【作者单位】：北京工业大学;中国建筑设计研究院;
【基金】：国家科技重大专项课题(2014ZX07406002)
【分类号】：TU822

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