{"title":"Operational conditions of electrochemical oxidation process for removal of cyanide (CN-) in real plating wastewater","authors":"Xin Zhao, Jang Minsik, Jinwoo Cho, Jae Woo Lee","doi":"10.12989/MWT.2020.11.3.217","DOIUrl":null,"url":null,"abstract":"An electrochemical oxidation process was applied to remove cyanide (CN-) from real plating wastewater. CN- removal efficiencies were investigated under various operating factors: current density and electrolyte concentration. Electrolyte concentration positively affected the removal of both CN- and Chemical Oxygen Demand (COD). As the electrolyte concentration increased from 302 to 2,077 mg Cl-/L, removal efficiency of CN- and COD increased from 49.07% to 98.30% and from 23.53% to 49.50%, respectively, at 10 mA/cm2. Current density affected the removal efficiency in a different way. As current density increased at a fixed electrolyte concentration, CN- removal efficiency increased while COD removal efficiency decreased, this is probably due to lowered current efficiency caused by water electrolysis.","PeriodicalId":18416,"journal":{"name":"Membrane Water Treatment","volume":null,"pages":null},"PeriodicalIF":0.8000,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Membrane Water Treatment","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.12989/MWT.2020.11.3.217","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
An electrochemical oxidation process was applied to remove cyanide (CN-) from real plating wastewater. CN- removal efficiencies were investigated under various operating factors: current density and electrolyte concentration. Electrolyte concentration positively affected the removal of both CN- and Chemical Oxygen Demand (COD). As the electrolyte concentration increased from 302 to 2,077 mg Cl-/L, removal efficiency of CN- and COD increased from 49.07% to 98.30% and from 23.53% to 49.50%, respectively, at 10 mA/cm2. Current density affected the removal efficiency in a different way. As current density increased at a fixed electrolyte concentration, CN- removal efficiency increased while COD removal efficiency decreased, this is probably due to lowered current efficiency caused by water electrolysis.
期刊介绍：
The Membrane and Water Treatment(MWT), An International Journal, aims at opening an access to the valuable source of technical information and providing an excellent publication channel for the global community of researchers in Membrane and Water Treatment related area. Specific emphasis of the journal may include but not limited to; the engineering and scientific aspects of understanding the basic mechanisms and applying membranes for water and waste water treatment, such as transport phenomena, surface characteristics, fouling, scaling, desalination, membrane bioreactors, water reuse, and system optimization.
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