Cañizares P, Louhichi B, Gadri A, Nasr B, Paz R, Rodrigo M A, Saez C
Department of Chemical Engineering, Facultad de Ciencias Químicas, Universidad de Castilla La Mancha, Campus Universitario s/n, 13071 Ciudad Real, Spain.
J Hazard Mater. 2007 Jul 31;146(3):552-7. doi: 10.1016/j.jhazmat.2007.04.085. Epub 2007 Apr 24.
The effluents of ink-manufacturing processes contain a large variety of pollutants such as dyes, surfactants, biocides, water soluble solvents, etc. In this work, the electrochemical oxidation of several dyes (methylene blue and rhodamine B), solvents (monoethylene glycol, diethylene glycol and glycerol) and surfactants (sodium dodecylbenzenesulfonate) has been studied. To carry out the electrolyses, a bench-scale plant with a single-compartment electrochemical flow-cell was used. Boron doped diamond (BDD) was used as anode and stainless steel (AISI 304) as cathode. For all the compounds tested, the conductive diamond electrooxidation allows achieving the almost complete removal of COD of the waste with a very high current efficiency. The efficiencies of the electrochemical processes seem to depend on the current density and on the nature of the anions contained in the waste (chlorine, sulphate, phosphate). Thus, it has been observed that the use of chloride media favours the treatment of dyes. On the contrary, the use of sulphate- or phosphate-containing solutions improves the removal of the aliphatic compounds studied (solvents). These results suggest an important role of the mediated electrochemical processes on the overall performance of the reaction system.
油墨制造过程的废水含有多种污染物，如染料、表面活性剂、杀生剂、水溶性溶剂等。在这项工作中，研究了几种染料（亚甲基蓝和罗丹明B）、溶剂（单乙二醇、二甘醇和甘油）和表面活性剂（十二烷基苯磺酸钠）的电化学氧化。为了进行电解，使用了带有单室电化学流通池的实验室规模装置。硼掺杂金刚石（BDD）用作阳极，不锈钢（AISI 304）用作阴极。对于所有测试的化合物，导电金刚石电氧化能够以非常高的电流效率几乎完全去除废物中的化学需氧量（COD）。电化学过程的效率似乎取决于电流密度以及废物中所含阴离子的性质（氯、硫酸根、磷酸根）。因此，已观察到使用氯化物介质有利于染料的处理。相反，使用含硫酸根或磷酸根的溶液可提高所研究脂肪族化合物（溶剂）的去除率。这些结果表明介导的电化学过程对反应体系的整体性能具有重要作用。
