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Valorising nutrient-rich digestate: Dilution, settlement and membrane filtration processing for optimisation as a waste-based media for microalgal cultivation

Fleuriane Fernandes, Alla Silkina Orcid Logo, Claudio Fuentes Grunewald Orcid Logo, Ellie Wood, Vanessa Ndovela, Darren Oatley-Radcliffe Orcid Logo, Robert Lovitt, Carole Llewellyn

Waste Management, Volume: 118, Pages: 197 - 208

Swansea University Authors: Fleuriane Fernandes, Alla Silkina Orcid Logo, Claudio Fuentes Grunewald Orcid Logo, Ellie Wood, Vanessa Ndovela, Darren Oatley-Radcliffe Orcid Logo, Robert Lovitt, Carole Llewellyn

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DOI (Published version): 10.1016/j.wasman.2020.08.037

Abstract

Digestate produced from the anaerobic digestion of food and farm waste is primarily returned to land as a biofertiliser for crops, with its potential to generate value through alternative processing methods at present under explored. In this work, valorisation of a digestate resulting from the treat...

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Published in: Waste Management
ISSN: 0956-053X
Published: Elsevier BV 2020
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spelling 2020-10-28T14:14:24.2927847 v2 55157 2020-09-10 Valorising nutrient-rich digestate: Dilution, settlement and membrane filtration processing for optimisation as a waste-based media for microalgal cultivation 2d794f8693a3aa36c5f333897f12a82c Fleuriane Fernandes Fleuriane Fernandes true false 216d36449db09ed98c6971a2254a2457 0000-0002-1804-8083 Alla Silkina Alla Silkina true false 8d7cf97e82178c021883618d24acb4b4 0000-0002-3122-9452 Claudio Fuentes Grunewald Claudio Fuentes Grunewald true false 48cffeffa84794e6c044b6b1153ec883 Ellie Wood Ellie Wood true false f18f0d7effafdbf760fd777edb3ce9ee Vanessa Ndovela Vanessa Ndovela true false 6dfb5ec2932455c778a5aa168c18cffd 0000-0003-4116-723X Darren Oatley-Radcliffe Darren Oatley-Radcliffe true false 130c3c35f45826bb0f4836305e8e51c7 Robert Lovitt Robert Lovitt true false bcd94bda79ebf4c2c82d82dfb027a140 Carole Llewellyn Carole Llewellyn true false 2020-09-10 SBI Digestate produced from the anaerobic digestion of food and farm waste is primarily returned to land as a biofertiliser for crops, with its potential to generate value through alternative processing methods at present under explored. In this work, valorisation of a digestate resulting from the treatment of kitchen and food waste was investigated, using dilution, settlement and membrane processing technology. Processed digestate was subsequently tested as a nutrient source for the cultivation of Chlorella vulgaris, up to pilot-scale (800L). Dilution of digestate down to 2.5% increased settlement rate and induced release of valuable compounds for fertiliser usage such as nitrogen and phosphorus. Settlement, as a partial processing of digestate offered a physical separation of liquid and solid fractions at a low cost. Membrane filtration demonstrated efficient segregation of nutrients, with micro-filtration recovering 92.38% of phosphorus and the combination of micro-filtration, ultra-filtration, and nano-filtration recovering a total of 94.35% of nitrogen from digestate. Nano-filtered and micro-filtered digestates at low concentrations were suitable substrates to support growth of Chlorella vulgaris. At pilot-scale, the microalgae grew successfully for 28 days with a maximum growth rate of 0.62 day−1 and dry weight of 0.86 g⋅L−1. Decline in culture growth beyond 28 days was presumably linked to ammonium and heavy metal accumulation in the cultivation medium. Processed digestate provided a suitable nutrient source for successful microalgal cultivation at pilot-scale, evidencing potential to convert excess nutrients into biomass, generating value from excess digestate and providing additional markets to the anaerobic digestion sector. Journal Article Waste Management 118 197 208 Elsevier BV 0956-053X Digestate, Membrane filtration, Settlement and dilution, Microalgae, Chlorella vulgaris, Pilot-scale 1 12 2020 2020-12-01 10.1016/j.wasman.2020.08.037 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University College paid. 2020-10-28T14:14:24.2927847 2020-09-10T10:07:33.3567721 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Fleuriane Fernandes 1 Alla Silkina 0000-0002-1804-8083 2 Claudio Fuentes Grunewald 0000-0002-3122-9452 3 Ellie Wood 4 Vanessa Ndovela 5 Darren Oatley-Radcliffe 0000-0003-4116-723X 6 Robert Lovitt 7 Carole Llewellyn 8 55157__18138__2a1056428122477a907bf94aa00d73b2.pdf 55157.pdf 2020-09-10T10:09:25.7112588 Output 1343633 application/pdf Version of Record true © 2020 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 4.0 (CC BY) License. true English http://creativecommons.org/licenses/by/4.0/
title Valorising nutrient-rich digestate: Dilution, settlement and membrane filtration processing for optimisation as a waste-based media for microalgal cultivation
spellingShingle Valorising nutrient-rich digestate: Dilution, settlement and membrane filtration processing for optimisation as a waste-based media for microalgal cultivation
Fleuriane Fernandes
Alla Silkina
Claudio Fuentes Grunewald
Ellie Wood
Vanessa Ndovela
Darren Oatley-Radcliffe
Robert Lovitt
Carole Llewellyn
title_short Valorising nutrient-rich digestate: Dilution, settlement and membrane filtration processing for optimisation as a waste-based media for microalgal cultivation
title_full Valorising nutrient-rich digestate: Dilution, settlement and membrane filtration processing for optimisation as a waste-based media for microalgal cultivation
title_fullStr Valorising nutrient-rich digestate: Dilution, settlement and membrane filtration processing for optimisation as a waste-based media for microalgal cultivation
title_full_unstemmed Valorising nutrient-rich digestate: Dilution, settlement and membrane filtration processing for optimisation as a waste-based media for microalgal cultivation
title_sort Valorising nutrient-rich digestate: Dilution, settlement and membrane filtration processing for optimisation as a waste-based media for microalgal cultivation
author_id_str_mv 2d794f8693a3aa36c5f333897f12a82c
216d36449db09ed98c6971a2254a2457
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48cffeffa84794e6c044b6b1153ec883
f18f0d7effafdbf760fd777edb3ce9ee
6dfb5ec2932455c778a5aa168c18cffd
130c3c35f45826bb0f4836305e8e51c7
bcd94bda79ebf4c2c82d82dfb027a140
author_id_fullname_str_mv 2d794f8693a3aa36c5f333897f12a82c_***_Fleuriane Fernandes
216d36449db09ed98c6971a2254a2457_***_Alla Silkina
8d7cf97e82178c021883618d24acb4b4_***_Claudio Fuentes Grunewald
48cffeffa84794e6c044b6b1153ec883_***_Ellie Wood
f18f0d7effafdbf760fd777edb3ce9ee_***_Vanessa Ndovela
6dfb5ec2932455c778a5aa168c18cffd_***_Darren Oatley-Radcliffe
130c3c35f45826bb0f4836305e8e51c7_***_Robert Lovitt
bcd94bda79ebf4c2c82d82dfb027a140_***_Carole Llewellyn
author Fleuriane Fernandes
Alla Silkina
Claudio Fuentes Grunewald
Ellie Wood
Vanessa Ndovela
Darren Oatley-Radcliffe
Robert Lovitt
Carole Llewellyn
author2 Fleuriane Fernandes
Alla Silkina
Claudio Fuentes Grunewald
Ellie Wood
Vanessa Ndovela
Darren Oatley-Radcliffe
Robert Lovitt
Carole Llewellyn
format Journal article
container_title Waste Management
container_volume 118
container_start_page 197
publishDate 2020
institution Swansea University
issn 0956-053X
doi_str_mv 10.1016/j.wasman.2020.08.037
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
active_str 0
description Digestate produced from the anaerobic digestion of food and farm waste is primarily returned to land as a biofertiliser for crops, with its potential to generate value through alternative processing methods at present under explored. In this work, valorisation of a digestate resulting from the treatment of kitchen and food waste was investigated, using dilution, settlement and membrane processing technology. Processed digestate was subsequently tested as a nutrient source for the cultivation of Chlorella vulgaris, up to pilot-scale (800L). Dilution of digestate down to 2.5% increased settlement rate and induced release of valuable compounds for fertiliser usage such as nitrogen and phosphorus. Settlement, as a partial processing of digestate offered a physical separation of liquid and solid fractions at a low cost. Membrane filtration demonstrated efficient segregation of nutrients, with micro-filtration recovering 92.38% of phosphorus and the combination of micro-filtration, ultra-filtration, and nano-filtration recovering a total of 94.35% of nitrogen from digestate. Nano-filtered and micro-filtered digestates at low concentrations were suitable substrates to support growth of Chlorella vulgaris. At pilot-scale, the microalgae grew successfully for 28 days with a maximum growth rate of 0.62 day−1 and dry weight of 0.86 g⋅L−1. Decline in culture growth beyond 28 days was presumably linked to ammonium and heavy metal accumulation in the cultivation medium. Processed digestate provided a suitable nutrient source for successful microalgal cultivation at pilot-scale, evidencing potential to convert excess nutrients into biomass, generating value from excess digestate and providing additional markets to the anaerobic digestion sector.
published_date 2020-12-01T04:09:10Z
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score 11.013731

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