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Aquaculture wastewater treatment through microalgal. Biomass potential applications on animal feed, agriculture, and energy

2021-05Journal article Restricted access
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dc.contributor.authorViegas, Catarina
dc.contributor.authorGouveia, Luisa
dc.contributor.authorGoncalves, Margarida
dc.date.accessioned2021-09-08T10:57:53Z
dc.date.available2021-09-08T10:57:53Z
dc.date.issued2021-05
dc.description.abstractThe use of microalgae to remediate raw effluent from brown crab aquaculture was evaluated by performing batch mode growth tests using separately the microalgae Chlorella vulgaris (Cv), Scenedesmus obliquus (Sc), Isochrysis galbana (Ig), Nannocloropsis salina (Ns), and Spirulina major (Sp). Removal efficiencies in batch growth were 100% for total nitrogen and total phosphorus for all microalgae. Chemical oxygen demand (COD) remediations were all above 72%. Biomass productivity varied from 20.9 mg L-1 day- 1 (N. salina) to 146.4 mg L-1 day- 1 (C. vulgaris). The two best performing algae were C. vulgaris and S. obliquus and they were tested in semicontinuous growth, reaching productivities of 879.8 mg L-1 day- 1 and 811.7 mg L-1 day- 1, respectively. The bioremediation of the effluent was tested with a transfer system consisting of three independent containers and compared with the use of a single container. The single container had the same capacity and received weekly the same volume of effluent as the three containers together. The remediation capacity of the 3 containers was much higher than the single one. The supplementation with NaNO3 was tested to improve the nutrient removal microalgae? capacity, with positive results. The removal efficiencies were 100% for total nitrogen and total phosphorus and higher than 96% for COD. The obtained C. vulgaris and S. obliquus biomass were composed of 31 and 35% proteins, 6 and 8% lipids, 39 and 30% carbohydrates, respectively. The composition of these biomass suggest that it can be used as novel and sustainable ingredients in aquaculture feeds. The algal biomass of Cv and Sc were used as biostimulants in the germination of wheat and watercress, and very promising results were attained, with increases in the germination index for Cv and Sc of 175% and 48% in watercress and 84% and 98% in wheat, respectively. The biomasses of Cv and Sc were also subjected to a torrefaction process with 72.5 ? 1.7% char yields. The obtained biochars were tested as biostimulants for germination seeds (wheat and watercress) and as bio-adsorbent of dye solutions.
dc.description.sponsorshipFundacao para a Ciencia e Tecnologia (Portugal)Portuguese Foundation for Science and Technology; Programa Operacional Competitividade e Internacionalizacao (COMPETE2020) (European Union) [Lisboa-010247-FEDER-035234]; Programa Operacional Regional de Lisboa (Lisboa 2020); Programa Operacional Regional do Algarve (Algarve 2020) [Red CYTED P319RT0025]
dc.identifier.doi10.1016/j.jenvman.2021.112187
dc.identifier.issn0301-4797
dc.identifier.urihttp://hdl.handle.net/10400.1/16966
dc.language.isoeng
dc.peerreviewedyes
dc.publisherACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
dc.subjectBioremediation
dc.subjectMicroalgae
dc.subjectAquaculture wastewater
dc.subjectBiostimulant
dc.subjectBiochar
dc.subjectAdsorption
dc.subject.otherEnvironmental Sciences & Ecology
dc.titleAquaculture wastewater treatment through microalgal. Biomass potential applications on animal feed, agriculture, and energy
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/68119/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/157821/PT
oaire.citation.startPage112187
oaire.citation.titleJournal of Environmental Management
oaire.citation.volume286
oaire.fundingStreamOE
oaire.fundingStream6817 - DCRRNI ID
person.familyNameGouveia
person.givenNameLuisa
person.identifierH-4046-2011
person.identifier.ciencia-id581B-924A-84DD
person.identifier.orcid0000-0003-0196-6360
person.identifier.scopus-author-id7004135834
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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