Malpass G R P, Miwa D W, Mortari D A, Machado S A S, Motheo A J
Instituto de Química de São Carlos, Universidade de São Paulo, CP 780, SP, 13560-970, São Carlos-SP, Brazil.
Water Res. 2007 Jul;41(13):2969-77. doi: 10.1016/j.watres.2007.02.054. Epub 2007 May 18.
The present paper presents the study of the decolorisation of real textile effluent by constant current electrolysis in a flow-cell using a Ti/Ru(0.3)Ti(0.7)O(2) DSA type electrode. The effect of increasing the chloride ion concentration on the efficiency of colour removal is discussed. Attempts to perform galvanostatic oxidation (40 and 60 mA cm(-2)) on the as-received effluent demonstrate that colour removal and total organic carbon (TOC) removal are limited. If the conductivity of the effluent is increased by adding 0.033 mol L(-1) Na(2)SO(4), little increase in the extent of colour/TOC removal is observed. However, when Na(2)SO(4) is substituted, stepwise, with NaCl (while maintaining the ionic strength constant) appreciable colour/TOC removal is observed. The study of the effect of increasing the current density demonstrates that total colour removal is possible at high currents. The efficiencies of colour and TOC removal are discussed in terms of the Energy per order (E(EO)/kWh m(-3)order(-1)) and Energy consumption (E(C)/kWh kg(-1)TOC), respectively. Finally, the extent of colour removal is compared to consent levels presented in the literature.
本文介绍了在流动池中使用Ti/Ru(0.3)Ti(0.7)O(2) DSA型电极通过恒流电解对实际纺织废水进行脱色的研究。讨论了增加氯离子浓度对脱色效率的影响。对原样废水进行恒电流氧化（40和60 mA cm(-2)）的尝试表明，脱色和总有机碳（TOC）去除效果有限。如果通过添加0.033 mol L(-1) Na(2)SO(4)来提高废水的电导率，观察到颜色/TOC去除程度几乎没有增加。然而，当用NaCl逐步替代Na(2)SO(4)（同时保持离子强度恒定）时，观察到明显的颜色/TOC去除。对增加电流密度的影响的研究表明，在高电流下可以实现完全脱色。分别根据每级能耗（E(EO)/kWh m(-3)级(-1)）和能耗（E(C)/kWh kg(-1)TOC）讨论了脱色效率和TOC去除效率。最后，将脱色程度与文献中给出的许可水平进行了比较。
