Re-use of dewatered aluminium-coagulated water treatment residual to immobilize phosphorus : batch and column trials using a condensed phosphate

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Title: Re-use of dewatered aluminium-coagulated water treatment residual to immobilize phosphorus : batch and column trials using a condensed phosphate
Authors: Babatunde, A.O.
Zhao, Y.Q.
Yang, Y.
Kearney, P.
Permanent link: http://hdl.handle.net/10197/3143
Date: 1-Mar-2008
Abstract: The aluminium content in dewatered aluminium-coagulated water treatment residual (DAC-WTR) can lead to a high phosphorus (P) removal capacity. Therefore, DAC-WTR has been used as adsorbent/soil amendment to remove P in several studies, focusing mostly on orthophosphates (ortho-P). This study is concerned with extending such reuse of DAC-WTR to remove P using a condensed phosphate as the model P source. Using a 48-hr equilibration time and a 1.18mm (mean particle size); (1) P removal was found to increase with increasing DAC-WTR dosage, but specific uptake of P per mass of DAC-WTR was decreased (2) A maximum adsorption capacity of 4.52mg-P/g of DAC-WTR was obtained at a pH of 4.0. In the continuous flow test, P removal efficiency decreased from 90 to 30% when loading was increased from 3.9 to 16.5g-P/m2.d. An average 45% removal efficiency was obtained after an intentional P loading surge. At the end of the continuous flow test, an operating removal capacity of 2.66 mg-P/g of DAC-WTR was determined which was 83.3% of the adsorption maxima obtained in the batch tests. There was no excessive loss of solids during the continuous flow test and aluminium content in the effluent remained below 0.1mg-Al3+/l. These results have demonstrated that dewatered DAC-WTR can further be used as a low-cost adsorbent media for condensed phosphate removal.
Funding Details: Other funder
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2008 Elsevier B.V.
Keywords: Adsorption;Aluminium-coagulated water treatment residual;Condensed phosphate;Disposal;Reuse;Wastewater treatment
Subject LCSH: Phosphorus--Absorption and adsorption
Water treatment plant residuals
Water--Purification--Phosphate removal
DOI: 10.1016/j.cej.2007.03.013
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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