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

本研究对几种有机卤化物和农药的光解作为一种新的水处理方法进行了研究。光催化采用氙灯，单次紫外处理采用中、低压紫外灯。结果如下：1。两种灯的单次紫外处理本研究中使用的有机卤化物在两种灯的单次紫外处理下均可分解，且反应符合一级反应。利用生物指示剂计算杀菌强度，比较不同类型紫外灯的分解率。根据该方法，具有碳双键（C=C）的化合物在中压紫外灯下的分解速度比低压紫外灯快。含碳-溴键（C-Br）的化合物在两种灯下都容易分解。在模拟日光、氙光的条件下，研究了TiO2水悬浮液中硫胺磷、一氯苯等芳香族化合物的光催化降解。这些化合物完全矿化为二氧化碳，并且TOC、pH和阴离子在时间过程中是一致的。这些化合物在pH变化和消失矿化所需的时间上有明显的差异。

In this research, photolysis of some kinds of organohalogenides and agricultural chemicals were investigated as new water treatment. A xenon lamp was used for photocatalysis and medium and low pressure Ultraviolet lamp were used for single UV treatment.Some results were gotten as follows.1.Single UV treatment using two types of lampsOrganohalogenides which were used in this research can be decomposed by single treatment of both types of UV lamps, and the reactions conform the first order reaction. By germicidal intensity which was calculated using a bioindicator, the decomposition ratio by different types of UV lamp can be compared. According to this methods, the compounds which have carbon double bond (C=C) was decomposed by medium pressure UV lamp faster than low pressure lamp. The compounds which have carbon bomine bond (C-Br) was decomposed easily by both lamps.2.Photocatalysis of chemical compounds in aqueous TiO2 suspensionsphotocatalitic degradation of the some kinds of aromatic compounds such as Thiobencarb, monochlorobenzene was studied in aqueous TiO2 suspensions with a simulated sunlight, xenon light. All these compounds were mineralized completely to carbon dioxide, and during the time-course of TOC,pH and Anion were consistent. There were clear differences in the pH change and the time required for disappearance and mineralization between these compounds.