Fenton and Fenton-like AOPs for alum sludge conditioning : effectiveness comparison with different Fe2+ and Fe3+ salts

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Title: Fenton and Fenton-like AOPs for alum sludge conditioning : effectiveness comparison with different Fe2+ and Fe3+ salts
Authors: Tony, Maha A.
Zhao, Y.Q.
El-Sherbiney, M.F.
Permanent link: http://hdl.handle.net/10197/3119
Date: Nov-2010
Abstract: Currently, organic polymers are adopted in alum sludge (aluminium-coagulated drinking water treatment sludge) conditioning. However, there are important concerns regarding the use of these polymers because of the unknown and long-term effects of the potential release of excess polymer to the surrounding environment when the sludge is landfilled. Therefore, as an initiative action, this study aimed at investigating alternative chemical conditioning methods and focused mainly on exploiting Fenton (Fe2+/H2O2) and Fenton-like (Fe3+/H2O2) reagents as the conditioner. Experiments have been conducted to test the effectiveness of Fenton’s reagent (containing the ferrous salts of chloride, sulphate or oxalate), Fenton-like reagent (containing ferric salts of chloride and sulphate) and the coagulation method using FeCl3 for an alum sludge conditioning at a constant hydrogen peroxide and iron salt concentrations of 125 and 20 mg/g DS (dry solids), respectively. The effectiveness on dewaterability of the alum sludge demonstrated that the maximum reduction (%) of SRF (specific resistance to filtration) and CST (capillary suction time) of 74 % and 47 %, respectively, can be obtained when Fenton’s reagent was adopted for sludge conditioning. Such reduction of 64% for SRF and 38% for CST can be achieved when Fenton-like reagents were applied.
Funding Details: Not applicable
Type of material: Journal Article
Publisher: Taylor & Francis
Copyright (published version): Taylor & Francis Group, LLC
Keywords: Alum sludge;Conditioning;Fenton’s reagent;Fenton-like process;Capillary suction time (CST);Specific resistance to filtration (SRF)
Subject LCSH: Water treatment plant residuals
Filters and filtration--Testing
Fenton's reagent
DOI: 10.1080/00986445.2010.520235
Language: en
Status of Item: Peer reviewed
Appears in Collections:Urban Institute Ireland Research Collection
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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