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Review of two mechanical separation technologies for the sustainable management of agricultural phosphorus in nutrient-vulnerable zones

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dc.contributor.author Lyons, Gary A.
dc.contributor.author Cathcart, Ashley
dc.contributor.author Frost, J. Peter
dc.contributor.author Wills, Michael
dc.contributor.author Johnston, Christopher
dc.contributor.author Ramsey, Rachel
dc.contributor.author Smyth, Beatrice
dc.date.accessioned 2021-05-10T10:34:01Z
dc.date.available 2021-05-10T10:34:01Z
dc.date.issued 2021-04
dc.identifier http://hdl.handle.net/20.500.12518/253
dc.identifier.citation Lyons, G. A., Cathcart, A., Frost, J. P., Wills, M., Johnston, C., Ramsey, R. and Smyth, B. (2021) ‘Review of Two Mechanical Separation Technologies for the Sustainable Management of Agricultural Phosphorus in Nutrient-Vulnerable Zones’, Agronomy. MDPI AG, 11(5), p. 836. doi: 10.3390/agronomy11050836. en_US
dc.identifier.issn 2073-4395
dc.identifier.uri https://doi.org/10.3390/agronomy11050836
dc.description Publication history: Accepted - 20 April 2021; Published online - 23 April 2021 en_US
dc.description.abstract This work reviews two mechanical separation technologies (screw press and decanting centrifuge) which could be used in the dairy, beef, pig and anaerobic digestion sectors in nutrient-vulnerable zones in order to improve the sustainability of manure and anaerobic digestate management by decreasing agricultural phosphorus loss and reducing environmental impact on water quality. Capital and operating costs, separation efficiency and throughput, and management and processing of separated fractions, including transport costs, environmental impacts and the biosecurity of separated solids for export, were considered. Of the two technologies reviewed, screw press separation is a more cost-effective option (5-fold cheaper per tonne of feedstock) when lower amounts of export of phosphorus off farm are acceptable. For farms and those with anaerobic digesters managing larger volumes of manure/digestate, screw press separation is possible. However if higher levels of phosphorus removal are required, the use of decanting centrifugation is a viable option. Centralised processing facilities could also make use of decanting centrifuge technology to act as processing hubs for local farms within a distance that makes it economical for transport of manure/treated manure to/from the processor (the maximum distance for economical transport of raw manure and separated solids is approximately 70 km and 84 km, respectively). Both separation technologies could be integrated into agricultural manure and digestate management systems in order to provide a more sustainable approach to managing agricultural phosphorus loss and its associated impact on water quality. Screw press and decanting centrifuge separation could reduce phosphorous loss to water bodies by 34% and from 30 to 93%, respectively. en_US
dc.description.sponsorship The authors wish to acknowledge support from the Department of Agriculture, Environment and Rural Affairs for Northern Ireland for funding Evidence and Innovation Project 18-04-01. en_US
dc.language.iso en en_US
dc.publisher MDPI en_US
dc.rights Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). en_US
dc.subject manure en_US
dc.subject digestate en_US
dc.subject phosphorus en_US
dc.subject mechanical separation en_US
dc.subject water quality en_US
dc.title Review of two mechanical separation technologies for the sustainable management of agricultural phosphorus in nutrient-vulnerable zones en_US
dc.type Article en_US
dcterms.dateAccepted 2021-04-20
dcterms.dateSubmitted 2021-03-17

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