Ekpo, U, Ross, AB, Camargo-Valero, M et al. (1 more author) (2016) Influence of pH on hydrothermal treatment of swine manure: Impact on extraction of nitrogen and phosphorus in process water. Bioresource Technology, 214. pp. 637-644. ISSN 0960-8524
Abstract
This study investigates the influence of pH on extraction of nitrogen and phosphorus from swine manure following hydrothermal treatment. Conditions include thermal hydrolysis (TH) at 120°C and 170°C, and hydrothermal carbonisation (HTC) at 200°C and 250°C in either water alone or in the presence of 0.1M NaOH, H2SO4, CH3COOH or HCOOH. Phosphorus extraction is pH and temperature dependent and is enhanced under acidic conditions. The highest level of phosphorus is extracted using H2SO4 reaching 94% at 170°C. The phosphorus is largely retained in the residue for all other conditions. The extraction of nitrogen is not as significantly influenced by pH, although the maximum N extraction is achieved using H2SO4. A significant level of organic-N is extracted into the process waters following hydrothermal treatment. The results indicate that operating hydrothermal treatment in the presence of acidic additives has benefits in terms of improving the extraction of phosphorus and nitrogen.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016, Elsevier. This is an author produced version of a paper published in Bioresource Technology. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | HTC; nutrient recovery; manure; pH; process water |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Energy Research Institute (Leeds) |
Funding Information: | Funder Grant number European Regional Development Fund A13/TT/0323 |
Depositing User: | Symplectic Publications |
Date Deposited: | 11 May 2016 10:51 |
Last Modified: | 17 Jul 2017 18:07 |
Published Version: | http://dx.doi.org/10.1016/j.biortech.2016.05.012 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.biortech.2016.05.012 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:99549 |