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Intensification of a new electrocoagulation system characterized by minimum energy consumption and maximum removal efficiency of heavy metals from simulated wastewater
Chemical Engineering and Processing: Process Intensification ( IF 4.3 ) Pub Date : 2020-07-08 , DOI: 10.1016/j.cep.2020.108026
E-S.Z. El-Ashtoukhy , N.K. Amin , Y.O. Fouad , H.A. Hamad

In the present study, a new simple self-gas stirred batch electrocoagulation reactor was designed. The new cell consisted of a cylindrical Al sheet anode and a cylindrical Al screen cathode placed at a small distance from the anode. The H2 evolving screen cathode improves the mixing conditions in the cell via turblence promotion and solution recycling which improves the economic efficiency of the electrochemical cell. This favourable hydrodynamic conditions improved considerably the % removal of Ni2+ and Cu2+ ions from a synthetic wastewater. The removal efficiency and apparent removal rate constant (kapp) of Cu2+ were higher than those of Ni2+ as a result of the additional cathodic deposition mechanism. Energy consumption ranged from 4.43–75.71 kW.h/kg depending on the operating conditions. The optimal operational conditions,were current density (c.d) of 1.72 mAcm−2, initial metal concentration (Co) of 100 mg.L−1, NaCl concentration (CN) of 1 g.L−1 and pH (5.5 for Cu and 4 for Ni) at 40 min. of electrolysis. The % removal efficiency ranged from 34.56–100% depending on the operating conditions. This study revealed that the new self stirred cell has the potential to be used for the removal of heavy metal from contaminated water.



中文翻译:

强化一种新的电凝系统,其特征在于最小的能耗和最大的从模拟废水中去除重金属的效率

在本研究中,设计了一个新的简单的自气搅拌分批电凝反应器。新电池由一个圆柱形的铝片阳极和一个圆柱形的铝丝网阴极组成,阴极与阳极之间的距离很小。H 2析出的阴极通过湍流促进和溶液再循环改善了电池中的混合条件,从而提高了电化学电池的经济效率。这种有利的流体动力学条件大大改善了从合成废水中去除Ni 2+和Cu 2+离子的百分比。Cu 2+的去除效率和表观去除率常数(k app)高于Ni 2+由于附加的阴极沉积机理。根据运行条件,能耗范围为4.43–75.71 kW.h / kg。最佳操作条件为:电流密度(cd)为1.72 mAcm -2,初始金属浓度(C o)为100 mg.L -1,NaCl浓度(C N)为1 gL -1,pH(Cu和Cu分别为5.5) Ni在40分钟时为4。电解 根据操作条件,%去除效率范围为34.56–100%。这项研究表明,新的自搅拌池有潜力用于从污水中去除重金属。

更新日期:2020-07-08
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