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Comparison of phosphorus recovery from incinerated sewage sludge ash (ISSA) and pyrolysed sewage sludge char (PSSC)

Kleemann, R, Chenoweth, Jonathan, Clift, Roland, Morse, Stephen, Pearce, P and Saroj, Devendra (2016) Comparison of phosphorus recovery from incinerated sewage sludge ash (ISSA) and pyrolysed sewage sludge char (PSSC) Waste Management, 60. pp. 201-210.

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Abstract

This research compares and contrasts the physical and chemical characteristics of incinerator sewage sludge ash (ISSA) and pyrolysis sewage sludge char (PSSC) for the purposes of recovering phosphorus as a P-rich fertiliser. Interest in P recovery from PSSC is likely to increase as pyrolysis is becoming viewed as a more economical method of sewage sludge thermal treatment compared to incineration. The P contents of ISSA and PSSC are 7.2–7.5% and 5.6%, respectively. Relative to the sludge, P concentrations are increased about 8-fold in ISSA, compared to roughly 3-fold in PSSC. Both PSSC and ISSA contain whitlockite, an unusual form of calcium phosphate, with PSSC containing more whitlockite than ISSA. Acid leaching experiments indicate that a liquid/solid ratio of 10 with 30 min contact time is optimal to release PO4-P into leachate for both ISSA and PSSC. The proportion of P extracted from PSSC is higher due to its higher whitlockite content. Heavy metals are less soluble from PSSC because they are more strongly incorporated in the particles. The results suggest there is potential for the development of a process to recover P from PSSC.

Item Type: Article
Subjects : Civil & Environmental Engineering
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
NameEmailORCID
Kleemann, RUNSPECIFIEDUNSPECIFIED
Chenoweth, JonathanJ.Chenoweth@surrey.ac.ukUNSPECIFIED
Clift, RolandR.Clift@surrey.ac.ukUNSPECIFIED
Morse, StephenS.Morse@surrey.ac.ukUNSPECIFIED
Pearce, PUNSPECIFIEDUNSPECIFIED
Saroj, DevendraD.Saroj@surrey.ac.ukUNSPECIFIED
Date : 12 December 2016
Funders : EPSRC
Identification Number : 10.1016/j.wasman.2016.10.055
Copyright Disclaimer : © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : Incineration, Incinerator sewage sludge ash (ISSA), Phosphorus recovery, Pyrolysed sewage sludge char (PSSC), Pyrolysis, Sewage sludge
Depositing User : Symplectic Elements
Date Deposited : 01 Mar 2017 11:24
Last Modified : 19 Jul 2017 11:35
URI: http://epubs.surrey.ac.uk/id/eprint/813651

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