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Coupling electrocoagulation with electro-oxidation for COD and phosphorus removal from industrial container wash water

流出物 化学 电凝 废水 电解质 磷酸盐 电化学 支撑电解质 制浆造纸工业 环境化学 环境工程 环境科学 电极 有机化学 物理化学 工程类
作者
Isbath Bona Ouré Sanni,M.R. Karimi Estahbanati,Anne Carabin,Patrick Drogui
出处
期刊:Separation and Purification Technology [Elsevier BV]
卷期号:282: 119992-119992 被引量:14
标识
DOI:10.1016/j.seppur.2021.119992
摘要

Electrochemical processes such as electrocoagulation (EC) and electrooxidation (EO) have proved their effectiveness for the treatment of industrial refractory wastewater. This study aimed to strategically combine EC and EO processes for the treatment of highly contaminated wastewater (COD of 10,360 ± 665 mg/L and phosphorus concentration of 22.9 ± 0.9 mg/L) coming from industrial container wash water (IWW). In this regard, the EO and EC processes were investigated individually and then in combination. For the EO process, different operating parameters were investigated such as the type of anode, current density, type of electrolyte, amount of electrolyte, treatment time, and contamination concentration, while for the EC the current density and pH were studied. Although EO process decreased up to 91 ± 4.9% of COD, this process did not allow to reach the guideline (800 mg/L of COD) required for effluent discharge in the sewage urban networks. This was mainly attributed to the presence of phosphate ions which are known as hydroxyl radical scavengers. EC process was then firstly used as pre-treatment to remove phosphate ions from IWW, followed by EO process. The EC-EO combination allowed 97% and 95% of phosphorus and COD removal to meet the sewer discharge standard, respectively. A cost analysis showed that the EC-EO coupling reduced the operating costs to 7.3 CAD $/m3 compared to 24 CAD$/m3 recorded while EO process was used alone for the treatment of IWW.
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