Effectiveness of a drinking-water treatment sludge in removing different phosphorus species from aqueous solution

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Title: Effectiveness of a drinking-water treatment sludge in removing different phosphorus species from aqueous solution
Authors: Razali, Melanie
Zhao, Y.Q.
Bruen, Michael
Permanent link: http://hdl.handle.net/10197/3178
Date: Jul-2007
Abstract: Drinking-water treatment sludge (DWTS) produced at water treatment plants is an inescapable by-product and has long been treated as a waste for landfill. In this study, a series of batch adsorption tests were conducted using a wide range of phosphorus (P) species to determine the adsorption capacities of freshly dewatered aluminium salt based DWTS. The adsorption process is highly dependant on the pH of the suspension and is good at low pHs with adsorption capacities in the order of orthophosphate>polyphosphate>organic phosphate when these three P species were simulated according to their level in typical municipal wastewater. At pH 4.0, the adsorption capacity for orthophosphate was 10.2 mg-PO43-/g DWTS, polyphosphate was 7.4 mg-PO43-/g DWTS and organic phosphate was 4.8 mg-PO43-/g DWTS. Subsequently, a continuous flow column test with dewatered Al-based DWTS as filter medium was conducted at a hydraulic loading of 2.79 m3/m2.d and an extremely high P loading of 210.5 PO43-/m2.d. The sludge bed remained stable and removed over 80% P in a 30 day period and the bed did not reach saturation point for over 60 days. This proves the potential of the sludge as a filter material in various forms of P immobilization, thus converting it from a waste to a useful material in pollutant control.
Funding Details: Not applicable
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2006 Elsevier B.V.
Keywords: AdsorptionAluminiumDrinking water treatment sludgePhosphorus removalReuse
Subject LCSH: Water treatment plant residuals
Phosphorus--Absorption and adsorption
DOI: 10.1016/j.seppur.2006.12.004
Language: en
Status of Item: Peer reviewed
Appears in Collections:Centre for Water Resources Research Collection
Urban Institute Ireland Research Collection
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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