Re-use of dewatered aluminium-coagulated water treatment residual to immobilize phosphorus : batch and column trials using a condensed phosphate
|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.
|Permanent link:||http://hdl.handle.net/10197/3143||Date:||1-Mar-2008||Online since:||2011-09-01T13:46:04Z||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||Journal:||Chemical Engineering Journal||Volume:||136||Issue:||2-3||Start page:||108||End page:||115||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
|DOI:||10.1016/j.cej.2007.03.013||Other versions:||http://dx.doi.org/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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