Sari-Erkan Hanife
Civil Engineering Faculty, Environmental Engineering Department, Yildiz Technical University, 34220 Davutpasa, Esenler, Istanbul, Turkey E-mail:
Water Sci Technol. 2019 Jun;79(12):2366-2377. doi: 10.2166/wst.2019.238.
This study mainly focuses on the process of electrocoagulation (EC) for the wastewater treatment from biodiesel production using waste cooking oil. The effects of current density, initial pH and electrolysis time on the EC process using aluminum (Al) and iron (Fe) electrodes were investigated for removal of chemical oxygen demand (COD). The COD removal efficiencies were found to be 62.7% and 63.4% at optimum conditions for Al (current density: 43 mA/cm, pH: 5, time: 21 min) and Fe (current density: 47 mA/cm, pH: 7.7, time: 30 min) electrodes, respectively. At these optimum conditions, the removal efficiencies of oil & grease, total phosphorus (TP), orthophosphate (PO4-P) and total suspended solids (TSS) were determined respectively to be above 89.9%, 98.9%, 99.5%, 86.7% for Al electrodes and 90.8%, 98.5%, 97.6%, 89.6% for Fe electrodes. Total operating costs were also found to be 6.43 €/m and 7.01 €/m for Al and Fe electrodes, respectively. The results indicate that the EC process using both types of electrodes seems to ensure an efficient treatment of biodiesel wastewater in terms of oil & grease and TP.
本研究主要聚焦于利用废弃食用油生产生物柴油过程中产生的废水的电凝聚（EC）处理工艺。研究了使用铝（Al）电极和铁（Fe）电极时，电流密度、初始pH值和电解时间对电凝聚过程中化学需氧量（COD）去除效果的影响。结果发现，对于Al电极（电流密度：43 mA/cm，pH值：5，时间：21分钟）和Fe电极（电流密度：47 mA/cm，pH值：7.7，时间：30分钟），在最佳条件下COD去除效率分别为62.7%和63.4%。在这些最佳条件下，分别测定了Al电极和Fe电极对油脂、总磷（TP）、正磷酸盐（PO4-P）和总悬浮固体（TSS）的去除效率，Al电极分别高于89.9%、98.9%、99.5%、86.7%，Fe电极分别为90.8%、98.5%、97.6%、89.6%。还发现Al电极和Fe电极的总运行成本分别为6.43 €/m和7.01 €/m。结果表明，就油脂和总磷而言，使用这两种电极的电凝聚工艺似乎都能确保对生物柴油废水进行有效处理。
