On the role of gypsum (CaSO_4.2H_2O) in conditioning and dewatering of a waterworks sludge

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Title: On the role of gypsum (CaSO_4.2H_2O) in conditioning and dewatering of a waterworks sludge
Authors: Zhao, Y.Q.
Allen, Stephen
Sun, Guangzhi
Permanent link: http://hdl.handle.net/10197/3269
Date: 2004
Abstract: Problems concerning the management and utilization of sludge derived from water treatment processes are still not fully solved. A common approach is direct discharge to a landfill site. This study provides experimental data to demonstrate the effectiveness of a combination of gypsum (CaSO4x2H2O) and an organic polymer in alum sludge conditioning and dewatering. Experimental results demonstrated that the filterability of dually conditioned alum sludge was significantly improved by the addition of gypsum at a 1:1 ratio (WT/WT) to original sludge solids. Dewatering tests showed that a further decrease of almost seven percentage of sludge cake equilibrium moisture content was achieved by the involvement of gypsum compared to the situation of single polymer conditioning. The importance of this study lies in the possible application of dewatered alum sludge to land use or as a filter medium in constructed wetland for wastewater treatment, providing a positive solution to the problem of alum sludge disposal.
Funding Details: Not applicable
Type of material: Journal Article
Publisher: Guangzhou University
Keywords: Alum sludgeConditioningDewateringGypsumPolymerSettlingSkeleton builder
Subject LCSH: Water treatment plant residuals
Sewage sludge--Conditioning
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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