Sengil I Ayhan, Kulaç Sedat, Ozacar Mahmut
Department of Environmental Engineering, Engineering Faculty, Sakarya University, Sakarya, Turkey.
J Hazard Mater. 2009 Aug 15;167(1-3):940-6. doi: 10.1016/j.jhazmat.2009.01.099. Epub 2009 Feb 5.
The removal of COD, suphide and oil-grease from tannery liming drum wastewater was experimentally investigated using direct current (DC) electrocoagulation (EC). In the EC of the wastewater, the effects of initial pH, electrolysis time and current density were examined. The COD, sulphide and oil-grease in the aqueous phase were effectively removed when mild steel electrodes were used as sacrificial anode. The optimum operating range for each operating variable was experimentally determined. The experimental results show that COD, sulphide and oil-grease was removed effectively. The overall COD, sulphide and oil-grease removal efficiencies reached 82%, 90% and 96%, respectively. The optimum current density for removal of COD, sulphide and oil-grease in the tannery liming drum wastewater were 35 mA/cm(2), 35 mA/cm(2) and 3.5 mA/cm(2) at 10 min electrolysis time and pH 3, respectively. Mean energy consumptions were 5.768 kWh/m(3) of COD, 0.524 kWh/m(3) of sulphide and 0.00015 kWh/m(3) of oil-grease. Results show that the pseudo-second-order rate equation provides the best correlation for the removal rate of the parameters.
采用直流（DC）电凝聚（EC）法对制革石灰鼓废水的化学需氧量（COD）、硫化物和油脂去除进行了实验研究。在该废水的电凝聚过程中，考察了初始pH值、电解时间和电流密度的影响。当使用低碳钢电极作为牺牲阳极时，水相中COD、硫化物和油脂被有效去除。通过实验确定了各操作变量的最佳操作范围。实验结果表明，COD、硫化物和油脂被有效去除。COD、硫化物和油脂的总去除效率分别达到82%、90%和96%。在电解时间为10分钟、pH值为3的条件下，制革石灰鼓废水中去除COD、硫化物和油脂的最佳电流密度分别为35 mA/cm²、35 mA/cm²和3.5 mA/cm²。COD的平均能耗为5.768 kWh/m³，硫化物为0.524 kWh/m³，油脂为0.00015 kWh/m³。结果表明，伪二级速率方程对各参数的去除率具有最佳相关性。
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