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Anaerobic Mesophilic Co-Digestion of Swine Slurry and Hidrolyzate in Batch Reactors: A Case Study

2021-06-10Artigo científico Acesso aberto
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datacite.subject.fosCiências Naturais::Ciências da Terra e do Ambiente
datacite.subject.sdg06:Água Potável e Saneamento
datacite.subject.sdg11:Cidades e Comunidades Sustentáveis
datacite.subject.sdg13:Ação Climática
dc.contributor.authorDomingues, Paulo S.
dc.contributor.authorPala, Helena
dc.contributor.authorOliveira, Nelson S.
dc.date.accessioned2026-02-26T17:02:20Z
dc.date.available2026-02-26T17:02:20Z
dc.date.issued2021-06-10
dc.description.abstractThe management of residual flows from swine farms, such as slurry and hydrolyzate, is a serious environmental problem in Portugal, so the search for new solutions is important, especially if they can be implemented in production sites, avoiding the transport of waste. Anaerobic co-digestion can configure a sustainable method of management and valorization of these flows in swine farms, resulting in biogas to produce energy and a digestate with agronomic value. The swine hydrolyzate is the product from the elimination of swine carcasses on the farms, through a hydrolysis process. Its use in the anaerobic process wasn’t found in the literature, identifying the need to evaluate its potential. Thus, anaerobic co-digestion of swine slurry and hydrolyzate was carried out and the main purpose of this research was to find the best feeding ratio between the two substrates in batch test, focusing on biogas production. The study was developed in two phases, both under mesophilic conditions. In the first one, using 100 ml syringes, the effect of the relative proportion of substrates on the anaerobic co-digestion potential was investigated and the effect of pressure sterilization of the substrates on biogas production was verified. In the second phase, a larger scale study was carried out in a 4,500 ml digestor, ran under the conditions identified as the most favorable in the preliminary tests. The results obtained allowed us to conclude that the largest volume of accumulated biogas was obtained with the proportion of 90.9% swine slurry: 9.1% swine hydrolyzate (v/v); and that the sterilization of the substrates doesn’t constitute an effective thermal pre-treatment. The larger scale test revealed an inefficient anaerobic process due to the inhibitory effect caused by the accumulation of ammonia and volatile organic acids. However, the production yield was 606.8 LBiogas/kgVS and 431.6 LMethane/kgVS, indicating that process allowed a production of biogas and methane higher than the values cited in literature for anaerobic digestion of swine slurry. This result showed that the use of swine hydrolyzate as a co-substrate results in a better balance of nutrients, promoting a better development of microorganisms.eng
dc.description.sponsorshipThis work was financially supported by: Base Funding—UIDB/50020/2020 of the Associate Laboratory LSRELCM—funded by national funds through FCT/MCTES (PIDDAC).
dc.identifier.citationDomingues PS, Pala H and Oliveira NS (2021) Anaerobic Mesophilic Co- Digestion of Swine Slurry and Hidrolyzate in Batch Reactors: A Case Study. Front. Environ. Sci. 9:684074. doi: https://doi.org/10.3389/fenvs.2021.684074.
dc.identifier.doi10.3389/fenvs.2021.684074
dc.identifier.eissn2296-665X
dc.identifier.urihttp://hdl.handle.net/10400.8/15728
dc.language.isoeng
dc.peerreviewedyes
dc.publisherFrontiers Media
dc.relationLaboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials
dc.relation.hasversionhttps://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2021.684074/full
dc.relation.ispartofFrontiers in Environmental Science
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectanaerobic process
dc.subjectswine farms
dc.subjectresidual flows
dc.subjectbiogas
dc.subjecthydrolysis process
dc.titleAnaerobic Mesophilic Co-Digestion of Swine Slurry and Hidrolyzate in Batch Reactors: A Case Studyeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleLaboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50020%2F2020/PT
oaire.citation.endPage13
oaire.citation.startPage1
oaire.citation.titleFrontiers in Environmental Science
oaire.citation.volume9
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameDomingues
person.familyNamePala
person.familyNameOliveira
person.givenNamePaulo Simão
person.givenNameHelena
person.givenNameNelson
person.identifier.ciencia-id7B1B-7C11-411B
person.identifier.ciencia-idCB18-B848-4389
person.identifier.orcid0000-0003-3106-2899
person.identifier.orcid0000-0001-7162-9621
person.identifier.orcid0000-0001-9451-2485
person.identifier.scopus-author-id6603182617
person.identifier.scopus-author-id7005130374
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
relation.isAuthorOfPublication40a4871c-ffba-4c95-b9fb-6bae288d2987
relation.isAuthorOfPublication70de6a08-f481-4558-a268-80471bc5cc83
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The management of residual flows from swine farms, such as slurry and hydrolyzate, is a serious environmental problem in Portugal, so the search for new solutions is important, especially if they can be implemented in production sites, avoiding the transport of waste. Anaerobic co-digestion can configure a sustainable method of management and valorization of these flows in swine farms, resulting in biogas to produce energy and a digestate with agronomic value. The swine hydrolyzate is the product from the elimination of swine carcasses on the farms, through a hydrolysis process. Its use in the anaerobic process wasn’t found in the literature, identifying the need to evaluate its potential. Thus, anaerobic co-digestion of swine slurry and hydrolyzate was carried out and the main purpose of this research was to find the best feeding ratio between the two substrates in batch test, focusing on biogas production. The study was developed in two phases, both under mesophilic conditions. In the first one, using 100 ml syringes, the effect of the relative proportion of substrates on the anaerobic co-digestion potential was investigated and the effect of pressure sterilization of the substrates on biogas production was verified. In the second phase, a larger scale study was carried out in a 4,500 ml digestor, ran under the conditions identified as the most favorable in the preliminary tests. The results obtained allowed us to conclude that the largest volume of accumulated biogas was obtained with the proportion of 90.9% swine slurry: 9.1% swine hydrolyzate (v/v); and that the sterilization of the substrates doesn’t constitute an effective thermal pre-treatment. The larger scale test revealed an inefficient anaerobic process due to the inhibitory effect caused by the accumulation of ammonia and volatile organic acids. However, the production yield was 606.8 LBiogas/kgVS and 431.6 LMethane/kgVS, indicating that process allowed a production of biogas and methane higher than the values cited in literature for anaerobic digestion of swine slurry. This result showed that the use of swine hydrolyzate as a co-substrate results in a better balance of nutrients, promoting a better development of microorganisms.
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