Treatment of Cr, Ni and Zn from galvanic rinsing wastewater by electrocoagulation process using iron electrodes
- 9 July 2012
- journal article
- research article
- Published by Taylor & Francis Ltd in Desalination and Water Treatment
- Vol. 56 (5), 1191-1201
- https://doi.org/10.1080/19443994.2014.951692
Abstract
Galvanizing plants contain reasonable amounts of heavy metal ions which pose a serious risk to humans, animals and the environment. In the present study, removal efficiencies of Cr, Ni and Zn from galvanic rinse wastewater (GRW) by electrocoagulation (EC) process using iron plate electrodes were investigated in a laboratory scale EC reactor. The effects of operational variables, such as operating time (0–50 min), current density (10–40 A/m2), initial pHi (2.4–6.4) and electrode connection modes (MP-P: monopolar-parallel, MP-S: monopolar-serial and BP-S: bipolar-serial), on the removal efficiencies of heavy metals were explored to determine the optimum operating conditions. Removal efficiencies of 99.77% for Cr, 85.62% for Ni and 99.04% for Zn at the optimum operating conditions (pHi 5.4, current density of 30 A/m2, operating time of 30 min and MP-P electrode connection mode) were obtained. The results showed that Cr, Ni and Zn removal efficiencies from GRW increased with increasing current density and pH at MP-P electrode connection mode. The results showed that EC can effectively reduce metal ions to a very low level. Amount of sludge generated and operating cost at the optimum conditions during the EC process were calculated as 2.32 kg/m3 and 0.70 €/m3. This study revealed that the EC process was very effective for removal of Cr, Ni and Zn from GRW.This publication has 36 references indexed in Scilit:
- Optimization of the Iron Electro-Coagulation Process of Cr, Ni, Cu, and Zn Galvanization By-Products by Using Response Surface MethodologySeparation Science and Technology, 2012
- Removal of Co (II) from aqueous solution by electrocoagulation process using aluminum electrodesDesalination, 2011
- Treatment of potable water containing low concentration of arsenic with electrocoagulation: Different connection modes and Fe–Al electrodesSeparation and Purification Technology, 2011
- Treatment of cadmium and nickel electroplating rinse water by electrocoagulationEnvironmental Technology, 2010
- Removal of Ni, Cu and Cr from a galvanic wastewater in an electrocoagulation system with Fe- and Al-electrodesSeparation and Purification Technology, 2010
- Electrochemical treatment and operating cost analysis of textile wastewater using sacrificial iron electrodesWater Science & Technology, 2009
- Effect of Operating Parameters on the Electrocoagulation of Simulated Acid Dyebath EffluentThe Open Environmental & Biological Monitoring Journal, 2008
- Leaching behaviour of a galvanic sludge in sulphuric acid and ammoniacal mediaJournal of Hazardous Materials, 2005
- Electrochemical technologies in wastewater treatmentSeparation and Purification Technology, 2004
- Recovery of valuable metals from electronic and galvanic industrial wastes by leaching and electrowinningWaste Management, 2003