Tertiary treatment of dairy industry wastewater with production of Chlorella vulgaris biomass: evaluation of effluent dilution

Ivan Venâncio de Oliveira Nunes; Carina Harue Bastos Inoue; Ana Elisa Rodrigues Sousa; João Carlos Monteiro de Carvalho; Andreia Maria da Anunciação Gomes; Marcelo Chuei Matsudo

doi:10.5327/Z21769478787

Autores

Ivan Venâncio de Oliveira Nunes Universidade Federal de Itajubá (UNIFEI) - Brasil https://orcid.org/0000-0002-5446-7269
Carina Harue Bastos Inoue Universidade Federal de Itajubá (UNIFEI) - Brasil https://orcid.org/0000-0003-1493-1490
Ana Elisa Rodrigues Sousa Universidade Federal de Itajubá (UNIFEI) - Brasil https://orcid.org/0000-0002-4555-0626
João Carlos Monteiro de Carvalho Universidade de São Paulo (USP) - Brasil https://orcid.org/0000-0001-7527-4151
Andreia Maria da Anunciação Gomes Instituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro (IFRJ) - Brasil https://orcid.org/0000-0001-7531-3026
Marcelo Chuei Matsudo Universidade Federal de Itajubá (UNIFEI) - Brasil https://orcid.org/0000-0001-6035-3308

DOI:

https://doi.org/10.5327/Z21769478787

Palavras-chave:

microalga, biomassa, tratamento terciário de efluentes, laticínios, lipídios

Resumo

Efluentes secundários da indústria de laticínios, quando não tratados adequadamente, podem provocar eutrofização de corpos d’água, principalmente por conter nutrientes como fósforo e nitrogênio. O tratamento terciário empregando microalgas poderia ser uma solução adequada para o estado de Minas Gerais, maior produtor brasileiro de leite, contribuindo na redução de impactos ambientais, bem como fornecendo biomassa para extração de óleos e obtenção de compostos ativos e insumos (incluindo proteínas) para nutrição animal. Neste trabalho, avaliaram-se diluições (com água destilada) do efluente secundário da indústria de laticínios para cultivo de Chlorella vulgaris em fotobiorreator tubular em escala de bancada. Os resultados encontrados indicam a viabilidade do uso de efluente de indústria de laticínios, pós tratamento secundário, para o cultivo de microalgas, apresentando crescimento similar àquele obtido em cultivos padrões (meio basal Bold). O efluente secundário sem diluição (100% efluente) foi o que apresentou melhor desempenho na produção de biomassa. Além disso, a biomassa obtida em efluentes não apresentou diferenças em relação àquela obtida em meio basal Bold (controle), no que se refere a teores de proteínas, lipídios ou perfil de ácidos graxos.

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