Development of new water treatment of compound pollutants by photo chemical reaction

在这项研究中，紫外线照射后的残留杀菌效果进行了调查。杀菌灯采用中压汞灯和低压汞灯。样品溶液为河水，作为净水厂的水源水。在本实验中，大肠杆菌被用作模式细菌，大肠杆菌噬菌体Q β被用作模式病毒。即使将10-20倍剂量的紫外线引入样品溶液中，也没有观察到对大肠杆菌和大肠杆菌噬菌体Q β的残留杀菌效果。以三卤甲烷生成势（THMFP）为指标，对腐殖酸类物质的分解进行了评价。考察了不同催化剂对分解效果的影响。使用的催化剂是铁离子和TiO 2。结果表明，在中压紫外灯和TiO 2 + UV的照射下，THMFP在第一阶段增加，在随后的阶段减少。因此，可以认为通过这些处理形成了低分子。

In this research, a residual germicidal effect after Ultraviolet irradiation was investigated. Medium pressure mercury lamp and low pressure mercury lamp were used as germicidal lamp. The sample solution was the river water which was used as the resource water of water purification plant. In this experiment, E.coli was used as model bacteria and coliphage Qbeta was used as model virus. Even though 10-20 times UV dose was introduced to the sample solution, the residual germicidal effect to E.coli and coliphage Qbeta wasn't observed. In case of the sample pretreated by 0.1mum filtration, the residual effect wasn't observed, either.Decomposition of humic substances were evaluated, using trihalomethane formation potential (THMFP) as index. Decomposition effect was investigated with various catalysts, too. Used catalysts were iron ion and TiO2. As results, THMFP was increased in first stage and decreased in following stage in cases of medium pressure UV lamp irradiation and TiO2 + UV.The same phenomena was reported in Ozonation before. Therefore, it is assumed that forming the low molecular was occurred by these treatment.