Electrochemical oxidation of reverse osmosis concentrate on mixed metal oxide (MMO) titanium coated electrodes

Bagastyo, Arseto Y., Radjenovic, Jelena, Mu, Yang, Rozendal, Rene A., Batstone, Damien J. and Rabaey, Korneel (2011) Electrochemical oxidation of reverse osmosis concentrate on mixed metal oxide (MMO) titanium coated electrodes. Water Research, 45 16: 4951-4959. doi:10.1016/j.watres.2011.06.039

Author Bagastyo, Arseto Y.
Radjenovic, Jelena
Mu, Yang
Rozendal, Rene A.
Batstone, Damien J.
Rabaey, Korneel
Title Electrochemical oxidation of reverse osmosis concentrate on mixed metal oxide (MMO) titanium coated electrodes
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
Publication date 2011-10
Sub-type Article (original research)
DOI 10.1016/j.watres.2011.06.039
Volume 45
Issue 16
Start page 4951
End page 4959
Total pages 9
Place of publication London, United Kingdom
Publisher I W A Publishing
Collection year 2012
Language eng
Formatted abstract
Reverse osmosis (RO) membranes have been successfully applied around the world for wastewater reuse applications. However, RO is a physical separation process, and besides the clean water stream (permeate) a reverse osmosis concentrate (ROC) is produced, usually representing 15-25% of the feed water flow and containing the organic and inorganic contaminants at higher concentrations. In this study, electrochemical oxidation was investigated for the treatment of ROC generated during the reclamation of municipal wastewater effluent. Using laboratory-scale two-compartment electrochemical systems, five electrode materials (i.e. titanium coated with IrO2-Ta2O5, RuO2-IrO2, Pt-IrO2, PbO2, and SnO2-Sb) were tested as anodes in batch mode experiments, using ROC from an advanced water treatment plant. The best oxidation performance was observed for Ti/Pt-IrO2 anodes, followed by the Ti/SnO2-Sb and Ti/PbO2 anodes. The effectiveness of the treatment appears to correlate with the formation of oxidants such as active chlorine (i.e. Cl2/HClO/ClO-). As a result, electro-generated chlorine led to the abundant formation of harmful by-products such as trihalomethanes (THMs) and haloacetic acids (HAAs), particularly at Ti/SnO2-Sb and Ti/Pt-IrO2 anodes. The highest concentration of total HAAs (i.e. 2.7 mg L-1) was measured for the Ti/SnO2-Sb electrode, after 0.55 Ah L-1 of supplied specific electrical charge. Irrespective of the used material, electrochemical oxidation of ROC needs to be complemented by a polishing treatment to alleviate the release of halogenated by-products.
Keyword Electrochemical oxidation
Anode material
Reverse osmosis concentrates
Organic pollutants
Oxidation by-products
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
Advanced Water Management Centre Publications
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 44 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 55 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sun, 23 Oct 2011, 00:01:11 EST by System User on behalf of Advanced Water Management Centre