O_3与O_3/H_2O_2工艺对地下水中TCP降解效率与机理研究

Degradation Effect and Study on the Mechanism of 1,2,3-Trichloropropane in Groundwater by O_3 and O_3/H_2O_2

1,2,3-三氯丙烷(TCP)是一种非常难降解的新兴污染物,难以被纳米零价铁还原降解。臭氧氧化可能是修复地下水高浓度TCP污染的有效方法,但前人研究尚未见报道。该文分别采用O_3和O_3/H_2O_2体系降解水中TCP,探讨了O_3通入方式、污染物初始浓度、初始pH值等操作条件的变化对降解效果的影响。结果发现,O_3和O_3/H_2O_2体系均可以有效降解TCP,在中性条件下均有较好的反应速率,并且pH值变化对反应速率影响较小,TCP的降解速率与羟基自由基的消耗速率成正比。H_2O_2的存在可以显著加速羟基自由基的消耗,使TCP降解效率更高。O_3/H_2O_2氧化反应条件温和、降解效率高、副产物少,且氧化剂本身不会引入任何污染物质,是很有发展前景的地下水中TCP原位污染修复技术。

1,2,3-trichloropropan（TCP） is an emerging contaminant difficult to be degraded and reduced by nanoscale zerovalent iron in groundwater. Ozone oxidation is likely to be an effective method to remediate elevated concentration of TCP in groundwater, while study on this method has not been reported so far. Degradation of TCP using O3 and Odi-I202 has been investigated. Both treatments have been compared in terms of dependence on several experimental parameters including ozone inlet pattern, TCP initial concentration and pH on reaction efficiency. The results show that both 03 and OJH202 can degrade TCP effectively, and pH has very little influence on the efficiency of processes. Consuming rate of hydroxyl radicals dominate degradation rate of TCP by O3 and O3/H202. The addition of H202 accelerate the consuming of hydroxyl radicals, and makes degradation of TCP effectively. OdH202 has more advantages such as mild reaction conditions, excellent degradation effectiveness, less by-products and less pollutant introduced by oxidizing agent. OJH202 technology is an excellent advanced oxidation process in removal of TCP in groundwater.