Use of dewatered alum sludge as main substrate in treatment reed bed receiving agricultural wastewater : long-term trial

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Title: Use of dewatered alum sludge as main substrate in treatment reed bed receiving agricultural wastewater : long-term trial
Authors: Zhao, Y.Q.
Zhao, X.H.
Babatunde, A.O.
Permanent link: http://hdl.handle.net/10197/3137
Date: Jan-2009
Abstract: This study aims to explore a novel application of dewatered alum sludge cakes (DASC) as the main medium in a single model reed bed to treat phosphorus-rich animal farm wastewater under "tidal flow" operation on a long term basis. It is expected that the cakes act as the carrier for developing biofilm and also serve as adsorbent to enhance phosphorus (P) immobilization. Results have demonstrated that average removal efficiencies of 73.3±15.9% for COD, 82.9±12.3% for BOD5, 86.4±6.0% for RP (reactive P), 88.6±7.2% for SRP (soluble reactive P) and 77.6±17.5% for SS can be achieved during the two year's operation. More significantly, the "P-adsorption proportion" by DASC in the reed bed is 42% of the overall P removal. The remaining removal of P may be contributed by the trapping and filtration process of DASC. Therefore, the lifetime of the DASC in reed bed is reasonably longer than that determined from the batch isotherm test.
Funding Details: Other funder
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2008 Elsevier Ltd.
Keywords: Dewatered alum sludge;Phosphorus;Reed bed;Tidal flow strategy;Wastewater treatment
Subject LCSH: Water treatment plant residuals
Phosphorus--Absorption and adsorption
Constructed wetlands
Agricultural wastes
DOI: 10.1016/j.biortech.2008.07.040
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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