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Kinetic study of Reactive Black 5 degradation by Fe2+/S2O82- process via interactive model-based response surface
Jun-Ming Hong1, Yu-Feng Xia2, Chung-Chuan Hsueh3
1Department of Environmental Science and Engineering, Hua-Qiao University, Xiamen 361021, China E-mail: jmhong@hqu.edu.cn; College of Chemical Engineering, Huaqiao University, Xiamen 361021, China.
Abstract:
This study aimed to kinetically discover optimal conditions on characteristics of Reactive Black 5 decolorization/degradation via ferrous (Fe2+)-activated potassium persulfate (PS). Monod-like kinetics and interactive model-based response surface methodology (RSM) were applied to fitting and predict optimize treatment. Biodegradability of the intermediates was also tested by shaking culture with two species (Proteus hauseri ZMd44 and Shewanella sp. WLP72). Results showed that the optimal degradation efficiency was predicted (through RSM) as pH 3.72, (PS) = 0.39 mM, and (Fe2+) = 0.29 mM. The transformation products (dl-4-hydroxymandelic acid, benzoic acid, benzene, formic acid, oxalic acid and acetic acid) were less toxic than the original dye solution. According to those results, clean-up of dye pollutants by the Fe2+/S2O82- process is feasible as a pre-processing for the biodegradation, and the predicted optimal conditions are meaningful for further industry utilization.
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