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首页> 外文会议>The 2002 International Solar Energy Conference, Jun 15-20, 2002, Reno, Nevada >PHOTOCATALYTIC OXIDATION OF TOLUENE IN WATER FROM AN ALGAE POND WITH HIGH DISSOLVED OXYGEN CONTENT
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PHOTOCATALYTIC OXIDATION OF TOLUENE IN WATER FROM AN ALGAE POND WITH HIGH DISSOLVED OXYGEN CONTENT

机译：高溶解氧藻类池中水中甲苯的光催化氧化。

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Water in well-mixed ponds containing photosynthetic algae has been observed to have an extremely high Dissolved Oxygen (DO) content. Up to four times saturation levels of DO have been recorded. Since DO is known to have an important role in the photocatalytic oxidation of organic contaminants in water, it was hypothesized that a faster rate of contaminant destruction would be observed in water drawn from algae ponds supersaturated with DO. In order to verify this hypothesis a bench scale, batch type photoreactor was constructed. Some baseline tests were performed to investigate the influence of UV intensity, water pH and DO content on the photocatalytic destruction of toluene in water. An array of ultraviolet "blacklight" lamps in a lamp box was used to simulate solar ultraviolet radiation. First-order reaction rate constants were calculated from the destruction data, using a kinetic model proposed earlier. The reaction was found to proceed forward equally fast at pH 4 and 10. A power law relation was derived for the reaction rate dependence on UV intensity. Presence of DO in the water was found to be required for the reaction to go forward. Water from an algae pond, supersaturated with dissolved oxygen was spiked with toluene and destruction tests were then conducted in the same reactor.. These tests did not show the expected improvement in destruction rates.
机译：已经观察到，在含有光合作用藻类的充分混合的池塘中，水的溶解氧（DO）含量极高。记录的溶解氧饱和度高达四倍。由于已知溶解氧在水中有机污染物的光催化氧化中起着重要作用，因此可以假设，从溶解有过量溶解氧的藻类池中抽出的水中，污染物的清除速度会更快。为了验证该假设，构建了台式规模的间歇式光反应器。进行了一些基线测试，以研究紫外线强度，水的pH值和DO含量对水中光催化降解甲苯的影响。灯箱中的紫外线“黑光”灯阵列用于模拟太阳紫外线辐射。使用更早提出的动力学模型，根据破坏数据计算一级反应速率常数。发现该反应在pH 4和10时同样快地进行。根据反应速率对紫外线强度的依赖性，得出幂律关系。发现在水中存在DO对于反应进行是必需的。将藻池中溶解有氧的过饱和水注入甲苯中，然后在同一反应器中进行破坏试验。这些试验未显示出预期的破坏率提高。

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