Electrokinetic Separation of Heavy Metals from Wastewater Treatment Sludge
- 30 July 2010
- journal article
- research article
- Published by Taylor & Francis Ltd in Separation Science and Technology
- Vol. 45 (12), 1982-1987
- https://doi.org/10.1080/01496395.2010.493836
Abstract
In the study, a preliminary experiment on the removal of heavy metals from industrial wastewater sludge was carried out to evaluate the feasibility of electrokinetic separation. Four different types of processing fluid—tap water, ethylenediaminetetraacetic acid (EDTA), citric acid (CA), and 0.1 M nitric acid—were tested. EDTA was found to be the most effective agent within the set of chemicals tested for removing heavy metals from sludge because of its strong chelating ability with metals. The removal efficiency of Pb and Cu was higher than that of Zn and Ni for all fluids. In tap water, EDTA, and CA, the metals moved toward the anode, implying that they existed as complexes with EDTA and CA or organic matter in the processing fluid. In nitric acid, the metals moved toward the cathode because nitric acid effectively desorbed the metal from the sludge; however, the removal efficiency was very low. The results indicated that electrokinetic technology effectively separated Cu and Pb, but not Zn and Ni.Keywords
This publication has 13 references indexed in Scilit:
- Electrokinetic remediation of contaminated soil with waste-lubricant oils and zincJournal of Hazardous Materials, 2009
- Pulsed Electrokinetic Decontamination of Agricultural Lands around Abandoned Mines Contaminated with Heavy MetalsSeparation Science and Technology, 2009
- Restoration of Saline Soil in Cultivated Land Using Electrokinetic ProcessSeparation Science and Technology, 2009
- Electrokinetic remediation of Zn and Ni-contaminated soilJournal of Hazardous Materials, 2009
- Electrolyte conditioning-enhanced electrokinetic remediation of arsenic-contaminated mine tailingJournal of Hazardous Materials, 2009
- Electrokinetic remediation of fluorine-contaminated soil: Conditioning of anolyteJournal of Hazardous Materials, 2009
- Feasibility of Recycling Residual Solid from Hydrothermal Treatment of Excess SludgeEnvironmental Engineering Research, 2008
- Electrokinetic enhancement removal of heavy metals from industrial wastewater sludgeChemosphere, 2006
- Evaluation of electrokinetic removal of heavy metals from sewage sludgeJournal of Hazardous Materials, 2005
- RESEARCH PAPERS : DECONTAMINATION OF HEAVY METALS FROM DEWATERED SLUDGE BY ACIDITHIOBACILLUS FERROOXIDANSEnvironmental Engineering Research, 2002