纺织工业产生的废水颜色很高,含有包括偶氮染料在内的染料,对人类和水活生物有毒。使用常规处理技术处理这些偶氮染料由于它们的顽固性质而具有挑战性。在目前的研究中,已研究了使用Fe电极去除甲基橙(MO)偶氮染料的额外Fe2对电凝法(EC)的影响。发现4-5之间的pH对于EC是最佳的,并且处理效率随染料浓度的增加而降低。加入Fe2+盐,一定浓度的染料去除率随着电流密度的增加而增加,Fe2+达到一定的极限,去除效率下降。COD,颜色和染料去除率为88.5%,93.1%和100%,分别,对于200毫克的EC。L-1染料溶液仅使用0.20mmol。对于0.40mAcm-2电流密度,L-1Fe2+,而对于EC来说,各自的去除效率为76.7%,63.4%和82.4%持续32分钟。欧共体各自的运营成本为768美元千克-1去除染料(0.342美元米-3),然而,对于含有额外Fe2+盐的EC,这是350美元公斤-1去除染料(0.189美元m-3)。动力学结果表明,一级动力学模型对EC的拟合最好,而二级动力学模型最适合添加Fe2+的EC。对于真正的纺织废水,对于0.15mmol,获得57.6%的COD去除。L-1添加了Fe2+的EC,而EC的COD去除率为27.8%,持续32分钟。根据研究,我们可以得出结论,Fe2辅助EC可用于有效处理含有偶氮染料等有毒化合物的纺织废水。
The wastewater generated from textile industries is highly colored and contains dyes including azo dyes, which are toxic to human and water-living organisms. The treatment of these azo dyes using conventional treatment techniques is challenging due to their recalcitrant properties. In the current
study, the effect of additional Fe2+ on electrocoagulation (EC) using Fe electrodes has been studied for the removal of methyl orange (MO) azo dye. pH between 4-5 was found to be optimum for EC and treatment efficiency decreased with increasing dye concentrations. With the addition of Fe2+ salt, dye removal for a certain concentration was increased with the increase of current density and Fe2+ up to a certain limit and after that, the removal efficiency decreased. The COD, color and dye removals were 88.5%, 93.1% and 100%, respectively, for EC of 200 mg.L-1 dye solution using only 0.20 mmol.L-1 Fe2+ for 0.40 mA cm-2 current density, whereas for EC, the respective removal efficiencies were 76.7%, 63.4% and 82.4% for 32 min. The respective operating cost for EC was $768 kg-1 removed dye ($0.342 m-3), whereas, for EC with additional Fe2+ salt, it was $350 kg-1 removed dye ($0.189 m-3). The kinetic results revealed that the first-order kinetic model was fitted best for EC, whereas the second-order kinetic model was best fitted for Fe2+ added EC. For real textile wastewater, 57.6% COD removal was obtained for 0.15 mmol.L-1 Fe2+ added EC compared to 27.8% COD removal for EC for 32 min. Based on the
study we can conclude that Fe2+ assisted EC can be used for effective treatment of textile wastewater containing toxic compounds like azo dyes.