Are alternative magnesium sources the key for a viable downstream transfer of struvite precipitation? Assessment of process feasibility and precipitate characteristics
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.5/23385 |
Resumo: | Phosphorus (P) recovery in source-separated decentralised wastewater treatment processes is an eco-efficient strategy in accordance with a circular economy perspective. Struvite (MgNH4PO4.6H2O) capture allows a reduction of P discharged to surface waters and generates a product known for its slow-release fertiliser properties. However, the cost and availability of current commercial Mg2+ sources hinder the downstream transfer of struvite precipitation. Although some alternative sources are available, there is a lack of information on how they compare to conventional sources; it is also not known how the Mg:PO4 ratio affects process performance or fertiliser product suitability. Therefore, this research evaluated the performance of two alternative sources, seasalt and seawater bittern, at different Mg:PO4 ratios. The results indicate that seasalt may be a problematic option owing to its high levels of NaCl, regardless of the Mg:PO4 level, which could affect soil fertility. Bittern, meanwhile, showed a high yield at pH 8.5 and Mg:PO4 1.2:1, achieving 99% recovery of PO4 and increasing also the recovery yield from 60% (using conventional sources) to 82% at Mg:PO4 1:2. In addition, bittern showed larger X-type crystals than commercial sources. The precipitate is composed mainly of struvite and Newberyite (MgHPO4.3H2O), with traces of K+, and no presence of NaCl at Mg:PO4 1.2:1; while at Mg:PO4 1:2 it forms a mixture of struvite with presence of Ca and K phosphates. In conclusion, bittern is an effective raw material to improve the downstream transfer of struvite precipitation into urine-diverting toilets in wastewater treatment systems |
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Are alternative magnesium sources the key for a viable downstream transfer of struvite precipitation? Assessment of process feasibility and precipitate characteristicsP recoverystruvite precipitationbitternseasaltfertiliser applicabilityPhosphorus (P) recovery in source-separated decentralised wastewater treatment processes is an eco-efficient strategy in accordance with a circular economy perspective. Struvite (MgNH4PO4.6H2O) capture allows a reduction of P discharged to surface waters and generates a product known for its slow-release fertiliser properties. However, the cost and availability of current commercial Mg2+ sources hinder the downstream transfer of struvite precipitation. Although some alternative sources are available, there is a lack of information on how they compare to conventional sources; it is also not known how the Mg:PO4 ratio affects process performance or fertiliser product suitability. Therefore, this research evaluated the performance of two alternative sources, seasalt and seawater bittern, at different Mg:PO4 ratios. The results indicate that seasalt may be a problematic option owing to its high levels of NaCl, regardless of the Mg:PO4 level, which could affect soil fertility. Bittern, meanwhile, showed a high yield at pH 8.5 and Mg:PO4 1.2:1, achieving 99% recovery of PO4 and increasing also the recovery yield from 60% (using conventional sources) to 82% at Mg:PO4 1:2. In addition, bittern showed larger X-type crystals than commercial sources. The precipitate is composed mainly of struvite and Newberyite (MgHPO4.3H2O), with traces of K+, and no presence of NaCl at Mg:PO4 1.2:1; while at Mg:PO4 1:2 it forms a mixture of struvite with presence of Ca and K phosphates. In conclusion, bittern is an effective raw material to improve the downstream transfer of struvite precipitation into urine-diverting toilets in wastewater treatment systemsElsevierRepositório da Universidade de LisboaRodrigues, Denis ManuelFragoso, Rita do AmaralCarvalho, Ana PaulaHein, ThomasBrito, António Guerreiro2023-02-04T01:30:27Z20222022-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/23385engJournal of Water Process Engineering 45 (2022) 102508https://doi.org/10.1016/j.jwpe.2021.102508info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-06T14:52:56Zoai:www.repository.utl.pt:10400.5/23385Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:07:38.015873Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Are alternative magnesium sources the key for a viable downstream transfer of struvite precipitation? Assessment of process feasibility and precipitate characteristics |
title |
Are alternative magnesium sources the key for a viable downstream transfer of struvite precipitation? Assessment of process feasibility and precipitate characteristics |
spellingShingle |
Are alternative magnesium sources the key for a viable downstream transfer of struvite precipitation? Assessment of process feasibility and precipitate characteristics Rodrigues, Denis Manuel P recovery struvite precipitation bittern seasalt fertiliser applicability |
title_short |
Are alternative magnesium sources the key for a viable downstream transfer of struvite precipitation? Assessment of process feasibility and precipitate characteristics |
title_full |
Are alternative magnesium sources the key for a viable downstream transfer of struvite precipitation? Assessment of process feasibility and precipitate characteristics |
title_fullStr |
Are alternative magnesium sources the key for a viable downstream transfer of struvite precipitation? Assessment of process feasibility and precipitate characteristics |
title_full_unstemmed |
Are alternative magnesium sources the key for a viable downstream transfer of struvite precipitation? Assessment of process feasibility and precipitate characteristics |
title_sort |
Are alternative magnesium sources the key for a viable downstream transfer of struvite precipitation? Assessment of process feasibility and precipitate characteristics |
author |
Rodrigues, Denis Manuel |
author_facet |
Rodrigues, Denis Manuel Fragoso, Rita do Amaral Carvalho, Ana Paula Hein, Thomas Brito, António Guerreiro |
author_role |
author |
author2 |
Fragoso, Rita do Amaral Carvalho, Ana Paula Hein, Thomas Brito, António Guerreiro |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Repositório da Universidade de Lisboa |
dc.contributor.author.fl_str_mv |
Rodrigues, Denis Manuel Fragoso, Rita do Amaral Carvalho, Ana Paula Hein, Thomas Brito, António Guerreiro |
dc.subject.por.fl_str_mv |
P recovery struvite precipitation bittern seasalt fertiliser applicability |
topic |
P recovery struvite precipitation bittern seasalt fertiliser applicability |
description |
Phosphorus (P) recovery in source-separated decentralised wastewater treatment processes is an eco-efficient strategy in accordance with a circular economy perspective. Struvite (MgNH4PO4.6H2O) capture allows a reduction of P discharged to surface waters and generates a product known for its slow-release fertiliser properties. However, the cost and availability of current commercial Mg2+ sources hinder the downstream transfer of struvite precipitation. Although some alternative sources are available, there is a lack of information on how they compare to conventional sources; it is also not known how the Mg:PO4 ratio affects process performance or fertiliser product suitability. Therefore, this research evaluated the performance of two alternative sources, seasalt and seawater bittern, at different Mg:PO4 ratios. The results indicate that seasalt may be a problematic option owing to its high levels of NaCl, regardless of the Mg:PO4 level, which could affect soil fertility. Bittern, meanwhile, showed a high yield at pH 8.5 and Mg:PO4 1.2:1, achieving 99% recovery of PO4 and increasing also the recovery yield from 60% (using conventional sources) to 82% at Mg:PO4 1:2. In addition, bittern showed larger X-type crystals than commercial sources. The precipitate is composed mainly of struvite and Newberyite (MgHPO4.3H2O), with traces of K+, and no presence of NaCl at Mg:PO4 1.2:1; while at Mg:PO4 1:2 it forms a mixture of struvite with presence of Ca and K phosphates. In conclusion, bittern is an effective raw material to improve the downstream transfer of struvite precipitation into urine-diverting toilets in wastewater treatment systems |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022 2022-01-01T00:00:00Z 2023-02-04T01:30:27Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.5/23385 |
url |
http://hdl.handle.net/10400.5/23385 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Water Process Engineering 45 (2022) 102508 https://doi.org/10.1016/j.jwpe.2021.102508 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799131170056699904 |