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Title: Inorganic profiles of chemical phosphorus removal sludge
Authors: Carliell-Marquet, Cynthia
Smith, Jennifer
Oikonomidis, Ioannis
Wheatley, Andrew D.
Keywords: Environment
Public health
Sewage treatment
Sewage disposal
Issue Date: 2010
Publisher: ICE Publishing
Citation: CARLIELL-MARQUET, C. ... et al, 2010. Inorganic profiles of chemical phosphorus removal sludge. Proceedings of the Institution of Civil Engineers - Water Management, 163(2), pp.65-77.
Abstract: Iron dosing is commonly used to remove phosphorus from wastewater but little is known about how this changes the distribution of iron, phosphorus, calcium, magnesium and trace metals in activated and digested sludge. This research compared the inorganic profiles of sludge from full-scale processes (activated sludge and anaerobic digestion) with and without iron dosing, with the aim of identifying changes in inorganic distribution resulting from iron dosing. Sludge phosphorus and metals were fractionated using sequential chemical extraction. Bioavailable iron was lower in iron-dosed activated sludge, as was bioavailable phosphorus (6.5 g/kg compared with 1.8 g/kg), with most of the iron and phosphorus bound as iron-hydroxy-phosphates. Similar results were found for anaerobically digested sludge afer iron dosing; iron and phosphorus in the sludge increased by 4 and 1.35 times, respectively, but bioavailability was decreased. The ratio of chemical oxygen demand to bioavailable phosphorus in the digester was 840 : 1 after iron dosing. By contrast, calcium, magnesium, copper and zinc were increasingly bioavailable in the digester after iron dosing. The reported changes were linked to the iron content of the sludge; hence the level of iron dosing is key to minimising changes in sludge inorganic profiles.
Description: This article was published in the Proceedings of the ICE - Water Management [© ICE Publishing]. Permission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees. The definitive version is available at: http://dx.doi.org/10.1680/wama.2010.163.2.65
Sponsor: Results used in this paper are from research funded by EPSRC grants GR/K/96946 and GR/R58550/01; and PGTA funding (Department of Civil Engineering, The University of Birmingham).
Version: Published
DOI: 10.1680/wama.2010.163.2.65
URI: https://dspace.lboro.ac.uk/2134/15248
Publisher Link: http://dx.doi.org/10.1680/wama.2010.163.2.65
ISSN: 1741-7589
Appears in Collections:Published Articles (Architecture, Building and Civil Engineering)

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