Department of Mining Engineering, Middle East Technical University, 06531 Ankara, Turkey.
J Hazard Mater. 2009 Nov 15;171(1-3):247-52. doi: 10.1016/j.jhazmat.2009.05.133. Epub 2009 Jun 6.
This paper attempts to compare electrocoagulation using aluminum anodes and stainless steel cathodes with conventional coagulation by aluminum sulfate dosing on aqueous suspensions of ultrafine quartz. Several key parameters affecting the efficiency of electrocoagulation and coagulation were investigated with laboratory scale experiments in search of optimal parameter values. Optimal values of the parameters were determined on the basis of the efficiency of turbidity removal from ultrafine quartz suspensions. The parameters investigated in the study were suspension pH, electrical potential, current density, electrocoagulation time, and aluminum dosage. A comparison between electrocoagulation and coagulation was made on the basis of total dissolved aluminum, revealing that electrocoagulation and coagulation were equally effective at the same aluminum dosage for the removal of quartz particles from suspensions. Coagulation, however, was more effective in a wider pH range (pH 6-9) than electrocoagulation which yielded optimum effectiveness in a relatively narrower pH range around 9, where, in both methods, these pH values corresponded to near-zero zeta potentials of quartz particles. Furthermore, experimental results confirmed that electrocoagulation could display some pH buffering capacity. The kinetics of electrocoagulation was very fast (<10 min) in approaching a residual turbidity, which could be modeled with a second-order rate equation.
本文试图比较使用铝阳极和不锈钢阴极的电凝聚与传统的硫酸铝投加混凝在超细石英水悬浮液中的效果。通过实验室规模实验研究了影响电凝聚和混凝效率的几个关键参数，以寻找最佳参数值。根据超细石英悬浮液浊度去除效率确定了最佳参数值。研究中考察的参数包括悬浮液 pH 值、电势、电流密度、电凝聚时间和铝剂量。基于总溶解铝，对电凝聚和混凝进行了比较，结果表明，在相同的铝剂量下，电凝聚和混凝对去除悬浮液中的石英颗粒同样有效。然而，混凝在更宽的 pH 范围（pH 6-9）内更有效，而电凝聚则在相对较窄的 pH 范围内（约 9）效果最佳，在这两种方法中，这些 pH 值对应于石英颗粒的近零 ζ 电位。此外，实验结果证实，电凝聚具有一定的 pH 缓冲能力。电凝聚的动力学非常快（<10 min），可以用二级速率方程来模拟接近残余浊度的过程。
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