Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agricultura
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| Autor principal: | |
|---|---|
| Publication Date: | 2024 |
| Formato: | Doctoral thesis |
| Idioma: | por |
| Fonte: | Repositório Institucional da UPF |
| Download full: | https://repositorio.upf.br/handle/123456789/10171 |
Resumo: | Global population growth brings the need to increase crop yields for food production. Conventional agricultural management is based on the application of chemical fertilizers. Increasing these fertilizers to achieve higher yields can pose problems for soil health and the environment. Microalgae biostimulants emerge as an alternative to reduce these damages. These compounds can result in improved plant development and increased productivity. However, large-scale microalgae biomass production can present challenges for bio-stimulant production. This is due to high production costs, primarily associated with growth media. The use of alternative methods for microalgae production, such as agro-industrial by-products, can bring greater savings to the production of this bioinput. The objective was to use whey in microalgae cultivation to increase biomass and subsequently develop a microalgal biostimulant. The three microalgae strains studied (Spirulina platensis, Chlorella homosphaera and Scenedesmus obliquus) showed tolerance to the addition of whey in fed-batch mode at low concentrations (1%, v/v). The raw whey was utilized by the microalgae in their metabolism, resulting in increased maximum specific growth rates and biomass concentration. Cost savings in growth media of up to 32%, 57%, and 73% were observed for the cultivation of S. obliquus, S. platensis, and C. homosphaera, respectively, when producing 1 kg of biomass in 0.5 L reactors. However, scaling up with natural light inhibited the growth of S. platensis in media with whey addition after 15 days, indicating the need for further studies with lower concentrations of the residue to reduce microalgal stress. The use of S. platensis biomass as a raw material for producing microalgal bio-stimulants showed bio-fertilizer potential (produced in 20% Zarrouk medium). Cell disruption of the microalgae by ultrasonic probe released bioactive compounds that can be used by plants in their metabolism, such as free amino acids and macro and micronutrients. Application of the bio-stimulant through seed treatment (ST) resulted in increased root area in the early stages of soybean, wheat, and oat seedlings. Soybean seed treatment with the developed bioproduct in an experimental field resulted in increased above-ground plant parts and number of nodules compared to chemical seed treatment alone. Seed treatment combined with foliar application in barley resulted in a positive influence on root and above-ground plant parts in treatments with microalgae compared to the control. Additionally, increased productivity was recorded in barley seed treatment compared to conventional field management. The application of dry S. platensis biomass in barley fields can serve as a partial substitute for chemical fertilizers, bringing greater sustainability to brewing barley producers without resulting in yield losses. Therefore, the use of whey in microalgae cultivation can increase microalgal biomass production. Additionally, the biostimulants and biofertilizers produced from S. platensis microalgal biomass have shown potential for agricultural application, potentially making crop cultivation more profitable and sustainable. |
| _version_ | 1871607622268878848 |
|---|---|
| author | Braun, Julia Catiane Arenhart |
| author_browse | Braun, Julia Catiane Arenhart |
| author_facet | Braun, Julia Catiane Arenhart |
| author_role | author |
| collection | Repositório Institucional da UPF |
| dc.contributor.author.fl_str_mv | Braun, Julia Catiane Arenhart |
| dc.contributor.none.fl_str_mv | Colla, Luciane Maria Lângaro, Nadia Canali |
| dc.date.none.fl_str_mv | 2024-09-16 2026-04-07T13:21:47Z 2026-04-07 |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.uri.fl_str_mv | BRAUN, Julia Catiane Arenhart. Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agricultura. 2024. 177 f. Tese (Doutorado em Engenharia Civil e Ambiental) - Universidade de Passo Fundo, 2024. https://repositorio.upf.br/handle/123456789/10171 |
| dc.language.iso.fl_str_mv | por |
| dc.publisher.none.fl_str_mv | Universidade de Passo Fundo Brasil UPF Programa de Pós-Graduação em Engenharia Civil e Ambiental Instituto de Tecnologia |
| dc.rights.driver.fl_str_mv | info:eu-repo/semantics/openAccess |
| dc.source.none.fl_str_mv | reponame:Repositório Institucional da UPF instname:Universidade de Passo Fundo (UPF) instacron:UPF |
| dc.subject.por.fl_str_mv | Biomassa Spirulina Microalga Resíduos agrícolas Biofertilizantes Resíduos industriais Engenharias |
| dc.title.none.fl_str_mv | Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agricultura |
| dc.type.driver.fl_str_mv | info:eu-repo/semantics/doctoralThesis |
| dc.type.status.fl_str_mv | info:eu-repo/semantics/publishedVersion |
| description | Global population growth brings the need to increase crop yields for food production. Conventional agricultural management is based on the application of chemical fertilizers. Increasing these fertilizers to achieve higher yields can pose problems for soil health and the environment. Microalgae biostimulants emerge as an alternative to reduce these damages. These compounds can result in improved plant development and increased productivity. However, large-scale microalgae biomass production can present challenges for bio-stimulant production. This is due to high production costs, primarily associated with growth media. The use of alternative methods for microalgae production, such as agro-industrial by-products, can bring greater savings to the production of this bioinput. The objective was to use whey in microalgae cultivation to increase biomass and subsequently develop a microalgal biostimulant. The three microalgae strains studied (Spirulina platensis, Chlorella homosphaera and Scenedesmus obliquus) showed tolerance to the addition of whey in fed-batch mode at low concentrations (1%, v/v). The raw whey was utilized by the microalgae in their metabolism, resulting in increased maximum specific growth rates and biomass concentration. Cost savings in growth media of up to 32%, 57%, and 73% were observed for the cultivation of S. obliquus, S. platensis, and C. homosphaera, respectively, when producing 1 kg of biomass in 0.5 L reactors. However, scaling up with natural light inhibited the growth of S. platensis in media with whey addition after 15 days, indicating the need for further studies with lower concentrations of the residue to reduce microalgal stress. The use of S. platensis biomass as a raw material for producing microalgal bio-stimulants showed bio-fertilizer potential (produced in 20% Zarrouk medium). Cell disruption of the microalgae by ultrasonic probe released bioactive compounds that can be used by plants in their metabolism, such as free amino acids and macro and micronutrients. Application of the bio-stimulant through seed treatment (ST) resulted in increased root area in the early stages of soybean, wheat, and oat seedlings. Soybean seed treatment with the developed bioproduct in an experimental field resulted in increased above-ground plant parts and number of nodules compared to chemical seed treatment alone. Seed treatment combined with foliar application in barley resulted in a positive influence on root and above-ground plant parts in treatments with microalgae compared to the control. Additionally, increased productivity was recorded in barley seed treatment compared to conventional field management. The application of dry S. platensis biomass in barley fields can serve as a partial substitute for chemical fertilizers, bringing greater sustainability to brewing barley producers without resulting in yield losses. Therefore, the use of whey in microalgae cultivation can increase microalgal biomass production. Additionally, the biostimulants and biofertilizers produced from S. platensis microalgal biomass have shown potential for agricultural application, potentially making crop cultivation more profitable and sustainable. |
| eu_rights_str_mv | openAccess |
| format | doctoralThesis |
| id | UPF_4d834a99465ffa7348db5ed5fa2ff1b4 |
| identifier_str_mv | BRAUN, Julia Catiane Arenhart. Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agricultura. 2024. 177 f. Tese (Doutorado em Engenharia Civil e Ambiental) - Universidade de Passo Fundo, 2024. |
| instacron_str | UPF |
| institution | UPF |
| instname_str | Universidade de Passo Fundo (UPF) |
| language | por |
| network_acronym_str | UPF |
| network_name_str | Repositório Institucional da UPF |
| oai_identifier_str | oai:repositorio.upf.br:123456789/10171 |
| publishDate | 2024 |
| publishDateSort | 2024 |
| publisher.none.fl_str_mv | Universidade de Passo Fundo Brasil UPF Programa de Pós-Graduação em Engenharia Civil e Ambiental Instituto de Tecnologia |
| reponame_str | Repositório Institucional da UPF |
| repository.mail.fl_str_mv | jucelei@upf.br||biblio@upf.br |
| repository.name.fl_str_mv | Repositório Institucional da UPF - Universidade de Passo Fundo (UPF) |
| repository_id_str | 1610 |
| spelling | Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agriculturaBiomassaSpirulinaMicroalgaResíduos agrícolasBiofertilizantesResíduos industriaisEngenhariasGlobal population growth brings the need to increase crop yields for food production. Conventional agricultural management is based on the application of chemical fertilizers. Increasing these fertilizers to achieve higher yields can pose problems for soil health and the environment. Microalgae biostimulants emerge as an alternative to reduce these damages. These compounds can result in improved plant development and increased productivity. However, large-scale microalgae biomass production can present challenges for bio-stimulant production. This is due to high production costs, primarily associated with growth media. The use of alternative methods for microalgae production, such as agro-industrial by-products, can bring greater savings to the production of this bioinput. The objective was to use whey in microalgae cultivation to increase biomass and subsequently develop a microalgal biostimulant. The three microalgae strains studied (Spirulina platensis, Chlorella homosphaera and Scenedesmus obliquus) showed tolerance to the addition of whey in fed-batch mode at low concentrations (1%, v/v). The raw whey was utilized by the microalgae in their metabolism, resulting in increased maximum specific growth rates and biomass concentration. Cost savings in growth media of up to 32%, 57%, and 73% were observed for the cultivation of S. obliquus, S. platensis, and C. homosphaera, respectively, when producing 1 kg of biomass in 0.5 L reactors. However, scaling up with natural light inhibited the growth of S. platensis in media with whey addition after 15 days, indicating the need for further studies with lower concentrations of the residue to reduce microalgal stress. The use of S. platensis biomass as a raw material for producing microalgal bio-stimulants showed bio-fertilizer potential (produced in 20% Zarrouk medium). Cell disruption of the microalgae by ultrasonic probe released bioactive compounds that can be used by plants in their metabolism, such as free amino acids and macro and micronutrients. Application of the bio-stimulant through seed treatment (ST) resulted in increased root area in the early stages of soybean, wheat, and oat seedlings. Soybean seed treatment with the developed bioproduct in an experimental field resulted in increased above-ground plant parts and number of nodules compared to chemical seed treatment alone. Seed treatment combined with foliar application in barley resulted in a positive influence on root and above-ground plant parts in treatments with microalgae compared to the control. Additionally, increased productivity was recorded in barley seed treatment compared to conventional field management. The application of dry S. platensis biomass in barley fields can serve as a partial substitute for chemical fertilizers, bringing greater sustainability to brewing barley producers without resulting in yield losses. Therefore, the use of whey in microalgae cultivation can increase microalgal biomass production. Additionally, the biostimulants and biofertilizers produced from S. platensis microalgal biomass have shown potential for agricultural application, potentially making crop cultivation more profitable and sustainable.CAPESO crescimento populacional mundial traz a necessidade do aumento de rendimentos de lavouras para produção de alimentos. O manejo convencional agrícola tem como base a aplicação de fertilizantes químicos. E, o aumento destes para obtenção de maiores rendimentos pode representar problemas para a saúde do solo e do meio ambiente. Bioestimulantes e biofertilizantes de microalgas surgem como alternativa para reduzir esses danos. Estes compostos podem resultar em melhoria no desenvolvimento de plantas e aumento de produtividade. No entanto, a produção de biomassa de microalgas em larga escala pode apresentar desafios para a produção de biofertilizantes. Isso ocorre pelos altos custos de produção, principalmente de meios de cultivos. A utilização de meios alternativos para produção de microalgas, como os subprodutos agroindustriais, pode trazer mais economia para a produção deste bioinsumo. Objetivou-se o uso de soro de leite no cultivo de microalgas para aumento de biomassa e posterior desenvolvimento de bioestimulante microalgal. As três cepas de microalgas (Spirulina platensis, Chlorella homosphaera e Scenedesmus obliquus) estudadas apresentaram tolerância à adição de soro de leite em modo de batelada alimentada em baixas concentrações (1%, v/v). O soro de leite in natura foi utilizado pelas microalgas em seu metabolismo resultando em aumento de taxas máximas de crescimento específico e concentração de biomassa. Ocorreu economia nos custos em meios de cultivos de até 32%, 57% e 73% no cultivo de S. obliquus, S. platensis e C. homosphaera respectivamente, considerando a produção de 1 kg de biomassa em reatores de 0,5 L. Porém, o aumento de escala com utilização de fonte luminosa natural inibiu o crescimento da microalga S. platensis em meio com adição de soro de leite após 15 dias, indicando mais estudos com menor concentração de adição do resíduo para diminuir o estresse microalgal. O uso de biomassa de S. platensis como matéria prima para a produção de bioestimulante microalgal apresentou potencial biofertilizante (produzidos em meio Zarrouk 20%). O rompimento celular da microalga por sonda ultrassônica liberou compostos bioativos que podem ser utilizados por plantas em seu metabolismo, como aminoácidos livres e macro e micronutrientes. A aplicação do bioestimulante por meio de tratamento de sementes (TS) resultou em aumento de área radicular nos estágios iniciais de plântulas de soja, trigo e aveia. O TS de soja pelo bioproduto desenvolvido com plantio em área experimental, resultou em aumento principalmente de parte aérea de planta e aumento de número de nódulos em relação à apenas o tratamento químico da semente. O TS junto de aplicação foliar em cevada resultou em influência positiva no aumento de parte radicular e parte aérea de plantas em tratamentos com microalga quando comparados à testemunha. Também foi registrado aumento de produtividade no TS de cevada em relação ao ensaio com condução convencional da lavoura. A aplicação de biomassa seca de S. platensis em lavouras de cevada pode atuar como substituto parcial de fertilizante químico, trazendo maior sustentabilidade às empresas produtoras de cevada cervejeira, sem resultar em perdas de produtividade. Portanto, a utilização de soro de leite no cultivo de microalgas pode aumentar a produção de biomassa microalgal. E, os bioestimulantes e biofertilizantes produzidos a partir da biomassa da microalga S. platensis apresentaram potencial para aplicação na agricultura, podendo tornar o cultivo de lavouras mais rentável e sustentável.Universidade de Passo FundoBrasilUPFPrograma de Pós-Graduação em Engenharia Civil e AmbientalInstituto de TecnologiaColla, Luciane MariaLângaro, Nadia CanaliBraun, Julia Catiane Arenhart2026-04-07T13:21:47Z2026-04-072024-09-16info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfBRAUN, Julia Catiane Arenhart. Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agricultura. 2024. 177 f. Tese (Doutorado em Engenharia Civil e Ambiental) - Universidade de Passo Fundo, 2024.https://repositorio.upf.br/handle/123456789/10171porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UPFinstname:Universidade de Passo Fundo (UPF)instacron:UPF2026-04-08T03:01:41Zoai:repositorio.upf.br:123456789/10171Repositório InstitucionalPRIhttp://repositorio.upf.br/oai/requestjucelei@upf.br||biblio@upf.bropendoar:16102026-04-08T03:01:41Repositório Institucional da UPF - Universidade de Passo Fundo (UPF) |
| spellingShingle | Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agricultura Braun, Julia Catiane Arenhart Biomassa Spirulina Microalga Resíduos agrícolas Biofertilizantes Resíduos industriais Engenharias |
| status_str | publishedVersion |
| title | Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agricultura |
| title_full | Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agricultura |
| title_fullStr | Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agricultura |
| title_full_unstemmed | Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agricultura |
| title_short | Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agricultura |
| title_sort | Valoração de resíduos agroindustriais para produção de biomassa microalgal e aplicação na agricultura |
| topic | Biomassa Spirulina Microalga Resíduos agrícolas Biofertilizantes Resíduos industriais Engenharias |
| url | https://repositorio.upf.br/handle/123456789/10171 |