Two strategies for phosphorus removal from reject water of municipal wastewater treatment plant using alum sludge

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Title: Two strategies for phosphorus removal from reject water of municipal wastewater treatment plant using alum sludge
Authors: Yang, Y.
Zhao, Y.Q.
Babatunde, A.O.
Kearney, P.
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Date: Dec-2009
Abstract: In view of the well recognized need of reject water treatment in MWWTP (municipal wastewater treatment plant), this paper outlines two strategies for P removal from reject water using alum sludge, which is produced as by-product in drinking water treatment plant when aluminium sulphate is used for flocculating raw waters. One strategy is the use of the alum sludge in liquid form for co-conditioning and dewatering with the anaerobically digested activated sludge in MWWTP. The other strategy involves the use of the dewatered alum sludge cakes in a fixed bed for P immobilization from the reject water that refers to the mixture of the supernatant of the sludge thickening process and the supernatant of the anaerobically digested sludge. Experimental trials have demonstrated that the alum sludge can efficiently reduce P level in reject water. The co-conditioning strategy could reduce P from 597-675 mg P/L to 0.14-3.20 mg P/L in the supernatant of the sewage sludge while the organic polymer dosage for the conditioning of the mixed sludges would also be significantly reduced. The second strategy of reject water filtration with alum sludge bed has shown a good performance of P reduction. The alum sludge has P-adsorption capacity of 31 mg-P/g-sludge, which was tested under filtration velocity of 1.0 m/h. The two strategies highlight the beneficial utilization of alum sludge in wastewater treatment process in MWWTP, thus converting the alum sludge as a useful material, rather than a waste for landfill.
Funding Details: Not applicable
Type of material: Journal Article
Publisher: IWA Publishing
Journal: Water Science and Technology
Volume: 60
Issue: 12
Start page: 3181
End page: 3188
Copyright (published version): IWA Publishing 2009
Keywords: Alum sludgeReject waterReusePhosphorusMunicipal wastewater treatment plant
Subject LCSH: Water treatment plant residuals
Phosphorus--Absorption and adsorption
Water reuse
DOI: 10.2166/wst.2009.609
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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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