Ryu J, Choi W, Choo K H
School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.
Water Sci Technol. 2005;51(6-7):491-7.
We developed and tested a pilot-scale photocatalyst-membrane hybrid reactor for water treatment. The performance of the pilot-scale reactor was evaluated by monitoring the degradation efficiency of several organic pollutants and the membrane suction pressure at different operating conditions. The concentration of humic acids rather increased in the initial period of UV illumination and then decreased gradually, which could be ascribed to the photoinduced desorption of humic acids from the TiO2 surface. The decoloring rate of methylene blue was faster than that of rhodamine B, whereas the order of mineralization rates of the dyes was reversed. 4-chlorophenol of 100 ppb was fully degraded under UV irradiation in 2 hours, which suggests that this hybrid reactor would be more suitable in removing micropollutants in water. The reactor was operated with either continuous or intermittent suction mode. In a continuous suction mode, the formation of TiO2 cake layers on the membrane surface occurred and caused a substantial increase in suction pressure. However, no further fouling (or suction pressure build-up) took place with an intermittent suction mode with the 9-min suction and 3-min pause period. The photocatalyst-membrane hybrid reactor system developed in this study could be an attractive option for controlling micropollutants in water.
我们开发并测试了一种用于水处理的中试规模的光催化剂-膜混合反应器。通过监测几种有机污染物的降解效率以及不同运行条件下的膜抽吸压力，对中试规模反应器的性能进行了评估。腐殖酸的浓度在紫外线照射初期反而增加，然后逐渐降低，这可能归因于腐殖酸从二氧化钛表面的光致解吸。亚甲基蓝的脱色速率比罗丹明B快，而染料的矿化速率顺序则相反。100 ppb的4-氯苯酚在紫外线照射下2小时内完全降解，这表明该混合反应器更适合去除水中的微污染物。该反应器以连续或间歇抽吸模式运行。在连续抽吸模式下，膜表面会形成二氧化钛滤饼层，并导致抽吸压力大幅增加。然而，在9分钟抽吸和3分钟暂停周期的间歇抽吸模式下，没有进一步的污染（或抽吸压力增加）发生。本研究开发的光催化剂-膜混合反应器系统可能是控制水中微污染物的一个有吸引力的选择。
