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Phosphorus recovery from process waste water made by the hydrothermal carbonisation of spent coffee grounds

Crossley, Oliver, Thorpe, Rex, Peus, Dominik and Lee, Judy (2020) Phosphorus recovery from process waste water made by the hydrothermal carbonisation of spent coffee grounds Bioresource Technology, 301, 122664.

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Abstract

This study investigates the recovery of phosphorus from the process water obtained through hydrothermal carbonisation (HTC) of a ‘wet’ biomass waste, namely spent coffee grounds. HTC was shown to liberate more than 82% of the total phosphorus in the grounds in the form of dissolved ortho-phosphate. Nanofiltration was used to concentrate the inorganic nutrients of the HTC process water, achieving a mass concentration factor of 3.9 times. The natural stoichiometry of phosphorus, magnesium and ammoniacal nitrogen in the nanofiltration retentate was favourable for struvite precipitation. 92.8% of aqueous phosphorus was recovered as struvite through simple pH adjustment, yielding a total phosphorus recovery of 75% from the feedstock spent coffee grounds.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Crossley, Olivero.crossley@surrey.ac.uk
Thorpe, RexRex.Thorpe@surrey.ac.uk
Peus, Dominik
Lee, Judyj.y.lee@surrey.ac.uk
Date : April 2020
Funders : Engineering and Physical Sciences Research Council (EPSRC), Antaco UK Ltd.
DOI : 10.1016/j.biortech.2019.122664
Copyright Disclaimer : © 2019. 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 : Hydrothermal carbonisation; Nanofiltration; Phosphate Recovery
Depositing User : James Marshall
Date Deposited : 30 Jan 2020 15:44
Last Modified : 24 Apr 2020 13:19
URI: http://epubs.surrey.ac.uk/id/eprint/853509

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