Electrolytic Reduction Improves Treatability of Humic Acids Containing Water Streams

Satyawali, Yamini, Wiele, Tom Van de, Saveyn, Hans, Meeren, Paul Van der and Verstraete, Willy (2007) Electrolytic Reduction Improves Treatability of Humic Acids Containing Water Streams. Journal of Chemical Technology & Biotechnology, 82 8: 730-737. doi:10.1002/jctb.1715

Author Satyawali, Yamini
Wiele, Tom Van de
Saveyn, Hans
Meeren, Paul Van der
Verstraete, Willy
Title Electrolytic Reduction Improves Treatability of Humic Acids Containing Water Streams
Journal name Journal of Chemical Technology & Biotechnology   Check publisher's open access policy
ISSN 1097-4660
Publication date 2007-07-06
Sub-type Article (original research)
DOI 10.1002/jctb.1715
Volume 82
Issue 8
Start page 730
End page 737
Total pages 8
Place of publication Chichester, U.K.
Publisher John Wiley & Sons for Society of Chemical Industry
Language eng
Subject 090409 Wastewater Treatment Processes
030604 Electrochemistry
Abstract BACKGROUND:An understanding of the structure of humic acids is essential for their degradation or physical removal from wastewaters. This work aims at targeting the reactivity of these molecules by modifying their properties. Structural alterations were carried out by electrolytically reducing the solution containing humic acid in an electrolytic cell to convert them into less polar structures. RESULTS:Overall it was observed that electrolytic reduction of humic acids strongly facilitated their further treatability. First, the reduced forms of humic acids exhibited improved adsorption on activated carbon. For 1 kW h of electrical energy consumed during electrolytic reduction, the additional chemical oxygen demand (COD) adsorbed was 60 g for a synthetic humic acid solution. Similarly, the additional COD adsorbed (kW h)-1 was found to be 35 g and 112 g for humic acid-rich effluent and landfill leachate, respectively. In comparison with non-reduced control samples, a 200-fold decrease in the chloroform formation was observed when electrolytically reduced drinking water samples were supplemented with a chlorine dosage of 150 mg L-1. Moreover, an enhanced membrane flux was obtained with electrically reduced samples, indicating their improved membrane filterability. CONCLUSION:The electrolyzed humus species were characterized by analyzing their surface tension and particle size. This work addresses an alternative technology for the treatment of water streams containing humic acids.
Keyword humic acids
electrolytic reduction
electrolytic oxidation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 7 times in Scopus Article | Citations
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