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近几年,紫外消毒逐渐在给水厂得到应用,紫外/氯联合消毒有效保障了供水水质的微生物安全性。为了考察单独氯消毒与紫外/氯联合消毒的灭菌效果,设计了一套低压紫外消毒系统,并置于水厂炭池出水后。同时,为了更全面评估不同类型紫外灯的消毒效果,对水厂的中压紫外消毒系统一并进行考察,应用流式细胞仪对各种消毒方式的灭菌效能进行了研究。结果显示,采用单独氯消毒时,微生物量随停留时间的增长速率仅与加入的消毒剂浓度有关;采用低压紫外/氯消毒工艺时,随着氯消毒剂投量的增加,水中的微生物衰减速率提高。将两种不同方式的余氯衰减情况与除菌效果结合来看,紫外/氯消毒方式可在仅有少量余氯存在的情况下,就能充分保证对微生物的灭活效果。因此,当采用低压紫外/氯消毒工艺时,可适当降低消毒剂的投加量。另外,中压紫外/氯消毒方式对微生物的灭活效果在加入浓度相对较高的氯消毒剂时要明显优于低压紫外/氯消毒方式。
In recent years, UV disinfection gradually been applied to the water plant, UV / chlorine disinfection effectively protect the water quality of microbial safety. In order to investigate the sterilizing effect of chlorine disinfection alone and UV / chlorine disinfection, a low-pressure UV disinfection system was designed and placed in the effluent of the carbon pool of the water plant. At the same time, in order to more fully evaluate the disinfection effect of different types of UV lamps, the medium pressure UV disinfection system in waterworks was investigated together. The sterilization efficacy of various disinfection methods was studied by flow cytometry. The results showed that the rate of growth of microbial biomass with residence time was only related to the concentration of disinfectant added when using chlorine alone. With the increase of chlorine disinfectant dosage, the decay rate of microorganisms in water improve. The two different ways of chlorine decay and sterilization combined with the view, UV / chlorine disinfection in the presence of only a small amount of residual chlorine, we can fully guarantee the inactivation of microorganisms. Therefore, when using low pressure UV / chlorine disinfection process, may be appropriate to reduce the dosage of disinfectants. In addition, medium-pressure UV / chlorine disinfection of microorganisms inactivation effect when adding a relatively high concentration of chlorine disinfectant to be significantly better than the low-pressure UV / chlorine disinfection.