Electrochemical decomplexing and oxidation of organic (chelating) additives in effluents from surface treatment and metal finishing

Lissens, Geert, Verhaege, Marc, Pinoy, Luc and Verstraete, Willy (2003) Electrochemical decomplexing and oxidation of organic (chelating) additives in effluents from surface treatment and metal finishing. Journal of Chemical Technology & Biotechnology, 78 10: 1054-1060. doi:10.1002/jctb.905


Author Lissens, Geert
Verhaege, Marc
Pinoy, Luc
Verstraete, Willy
Title Electrochemical decomplexing and oxidation of organic (chelating) additives in effluents from surface treatment and metal finishing
Journal name Journal of Chemical Technology & Biotechnology   Check publisher's open access policy
ISSN 1097-4660
0268-2575
Publication date 2003-10
Year available 2003
Sub-type Article (original research)
DOI 10.1002/jctb.905
Volume 78
Issue 10
Start page 1054
End page 1060
Total pages 7
Place of publication Chichester, U.K.
Publisher John Wiley & Sons for Society of Chemical Industry
Language eng
Subject 030604 Electrochemistry
Abstract The electrochemical decomplexing and oxidation of two frequently used complexing agents in surface treatment and metal finishing - EDTA (ethylenediaminetetraacetic acid) and NTA (nitrilotriacetic acid) - and of organic non-complexing additives used in nickel-plating baths were the subject of this study. Using a Ti-RuO2 electrode, a partial indirect oxidation by in-situ electrochemical generation of chlorine compounds could be achieved for EDTA and NTA. At a boron-doped diamond (BDD) electrode however, complete decomplexing and high COD (Chemical Oxygen Demand) and TOC (Total Organic Carbon) (up to 95%) removal occurred at an average current density of 2 A dm-2. It is shown that direct electrochemical oxidation at a BDD electrode resulted in lower energy consumption and higher treatment rates than indirect oxidation at a Ti-RuO2 electrode. Decomplexing at the BDD electrode occurred at high current efficiencies ranging from 71% to 95% with decomplexing rates in the order of 3.13 mmol (Ah)-1 and 5.02 mmol (Ah)-1 for EDTA and NTA respectively. COD removal rates obtained were 0.090 g (Ah)-1 for EDTA, 0.100 g (Ah)-1 for NTA and 0.205 g (Ah)-1 for the nickel-plating additives. Electrochemical decomplexing and oxidation of common chelating agents can render the subsequent metal precipitation and biological wastewater treatment of surface treatment and metal finishing effluents more efficient. Copyright © 2003 Society of Chemical Industry
Keyword electrochemical oxidation
chelating agents
BDD electrode
electrochemical decomplexing
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Advanced Water Management Centre Publications
 
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Created: Mon, 16 Feb 2009, 10:51:50 EST by Judy Dingwall on behalf of Advanced Water Management Centre