De Coster Jonas, Vanherck Wouter, Appels Lise, Dewil Raf
KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, J. De Nayerlaan 5, B-2860, Sint-Katelijne-Waver, Belgium.
KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, J. De Nayerlaan 5, B-2860, Sint-Katelijne-Waver, Belgium.
J Environ Manage. 2017 Apr 1;190:61-71. doi: 10.1016/j.jenvman.2016.11.049. Epub 2016 Dec 29.
The electrochemical degradation of 4-chlorophenol (4-CP) in the presence of chlorides by the use of a Ti/RuO-IrO anode was investigated under different operational parameters such as applied current density (J) and chloride concentration ([NaCl]). By performing a design of experiments, a model for the removal of 4-chlorophenol under these circumstances was obtained. To investigate matrix effects for this oxidation process, the influence of various biodegradable substrates (such as glucose, a complex synthetic wastewater and a pilot-scale UASB effluent) on the degradation profile of 4-chlorophenol was investigated. The 4-CP degradation was hardly affected by the presence of glucose, which was itself only limitedly degraded (max. 5%). This indicates a selective degradation for the phenolic compound, independent of the values of the operational parameters. The presence of a more complex synthetic wastewater, however, resulted in a decrease in 4-CP degradation rate up to a factor 7. The biodegradable substrates are in this case also degraded by the electrochemical treatment. In the case where 4-CP was added to a pilot-scale UASB effluent and this wastewater was afterwards treated, the degradation rate of 4-CP only decreased by a factor 2. After 2 h of treatment, a full mineralization was obtained in this experiment. The latter observation suggests the suitability of the technique as an effluent polishing step after a biological treatment or as a treatment in recycle over a biological reactor.
研究了在氯化物存在下，使用Ti/RuO-IrO阳极对4-氯酚（4-CP）进行电化学降解，考察了不同操作参数如施加电流密度（J）和氯化物浓度（[NaCl]）的影响。通过进行实验设计，得到了在这些条件下去除4-氯酚的模型。为了研究该氧化过程的基质效应，考察了各种可生物降解底物（如葡萄糖、复杂合成废水和中试规模UASB出水）对4-氯酚降解曲线的影响。葡萄糖的存在对4-CP降解几乎没有影响，而葡萄糖本身仅被有限降解（最大5%）。这表明对酚类化合物有选择性降解，与操作参数值无关。然而，更复杂的合成废水的存在导致4-CP降解速率降低高达7倍。在这种情况下，可生物降解底物也会被电化学处理降解。当将4-CP添加到中试规模UASB出水中并随后对该废水进行处理时，4-CP的降解速率仅降低2倍。在本实验中，处理2小时后实现了完全矿化。后一观察结果表明该技术适合作为生物处理后的出水抛光步骤或作为生物反应器循环处理。
