Valdés H, Zaror C A
Chemical Eng. Dept., University of Concepción, P.O. Box: 160-C, Correo 3, Concepción, Chile.
Water Sci Technol. 2005;52(10-11):281-8.
Benzothiazole (BT) is a toxic and poorly biodegradable contaminant, usually found in wastewater from rubber related applications. This compound could be effectively eliminated using advanced treatment processes. This paper compares experimental results on detoxification systems based on ozone oxidation, activated carbon adsorption, and simultaneous adsorption-oxidation using ozone in the presence of activated carbon. The effect of pH (2-11), and the presence of radical scavengers (tert-butyl alcohol and sodium carbonate) on process rates and removal efficiencies are assessed at laboratory scale. The experimental system consisted of a 1 L differential circular flow reactor and an ozone generator rated at 5 g O3/h. Results show that ozone oxidation combined with activated carbon adsorption increases the overall BT oxidation rate with respect to the ozonation process and activated carbon adsorption. In the presence of free radical scavenger, only a 44% reduction in BT removal rate is observed in the simultaneous treatment, as compared with 72% when ozonation treatment is used, suggesting that BT oxidation reactions mainly take place on the activated carbon surface.
苯并噻唑（BT）是一种有毒且难生物降解的污染物，通常存在于橡胶相关应用产生的废水中。这种化合物可以通过先进的处理工艺有效去除。本文比较了基于臭氧氧化、活性炭吸附以及在活性炭存在下利用臭氧进行同时吸附 - 氧化的解毒系统的实验结果。在实验室规模下评估了pH值（2 - 11）以及自由基清除剂（叔丁醇和碳酸钠）的存在对处理速率和去除效率的影响。实验系统由一个1升的微分循环流动反应器和一台额定产率为5 g O₃/h的臭氧发生器组成。结果表明，与臭氧氧化过程和活性炭吸附相比，臭氧氧化与活性炭吸附相结合提高了整体BT氧化速率。在存在自由基清除剂的情况下，同时处理中BT去除率仅降低44%，而使用臭氧氧化处理时为72%，这表明BT氧化反应主要发生在活性炭表面。
