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Animal slurry sanitization through pH adjustment: process optimization and impact on slurry characteristics

2021Journal article Open access
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dc.contributor.authorRodrigues, Joana
dc.contributor.authorAlvarenga, Paula
dc.contributor.authorSilva, Ana Carla
dc.contributor.authorBrito, Luisa
dc.contributor.authorTavares, Jorge
dc.contributor.authorFangueiro, David
dc.date.accessioned2021-06-01T09:11:02Z
dc.date.available2021-06-01T09:11:02Z
dc.date.issued2021
dc.description.abstractSanitization by pH adjustment of dairy and pig slurries was evaluated for potential use as organic fertilizer in horticulture. This requires absence of Salmonella in 25 g of slurry and less than 1000 Escherichi coli colony-forming unit per gram of fresh slurry (Regulation (EU) 2019/1009). Additives used in the alkalinization and acidification treatments, included hydroxide-salts and nitrogen-based reactants to increase slurry pH to a basic range (9.0–11.0) and concentrated H2SO4 to decrease slurry pH to an acidic range (5.5–3.5). While low-cost urea was unable to increase the slurry pH above 9.5, ammonia efficiently increased slurry pH to the targeted values (but enhanced the emissions risk), whereas the effect of Ca(OH)2 was hindered by its low solubility. Slurry sanitization by alkalinization was achieved at a pH of 9.5 for both slurries, using similar quantities of KOH or NaOH. KOH was selected for further tests since it provides a plant macronutrient. Acidification with concentrated H2SO4 was able to achieve sanitization by lowering the pH to 5.0. After a 60-d storage experiment with raw and treated slurries, the level of E. coli was below the sanitization limit for all samples. Storage had no significant impact on slurry characteristics, except for ammonium-nitrogen content. Acidification treatment minimized ammonia lossespt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationRodrigues, J.; Alvarenga, P.; Silva, A.C.; Brito, L.; Tavares, J.; Fangueiro, D. Animal Slurry Sanitization through pH Adjustment: Process Optimization and Impact on Slurry Characteristics. Agronomy 2021, 11, 517pt_PT
dc.identifier.doihttps://doi.org/10.3390/ agronomy11030517pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.5/21404
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectpig slurrypt_PT
dc.subjectdairy slurrypt_PT
dc.subjectacidificationpt_PT
dc.subjectalkalinizationpt_PT
dc.subjectEscherichia colipt_PT
dc.subjectslurry storagept_PT
dc.titleAnimal slurry sanitization through pH adjustment: process optimization and impact on slurry characteristicspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleAgronomypt_PT
person.familyNameAlvarenga
person.familyNameBrito
person.familyNameFangueiro
person.givenNamePaula
person.givenNameLuisa
person.givenNameDavid
person.identifierK-9083-2017
person.identifier.ciencia-idEA16-C2AD-D854
person.identifier.ciencia-id2E19-52D0-0BB5
person.identifier.ciencia-id2C1E-55EC-D6C9
person.identifier.orcid0000-0002-3225-3358
person.identifier.orcid0000-0002-8614-5184
person.identifier.orcid0000-0002-6101-9210
person.identifier.scopus-author-id16174357800
person.identifier.scopus-author-id17134928600
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication7b078a5f-1516-4f32-8a46-334150ab7506
relation.isAuthorOfPublication54fe02c8-ee2a-487e-8c5c-00893cab58c8
relation.isAuthorOfPublicationb48e1880-8682-4508-8aae-dc68814c9177
relation.isAuthorOfPublication.latestForDiscoveryb48e1880-8682-4508-8aae-dc68814c9177

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