Spirulina platensis in livestock wastewater bioremediation: pollution control by obtaining macromolecules

Denise Salvador de Souza; Mônica Silva dos Santos; Henrique Vieira de Mendonça

doi:10.17765/2176-9168.2025v18e12739

Authors

Denise Salvador de Souza Universidade Federal Rural do Rio de Janeiro https://orcid.org/0000-0002-9736-5676
Mônica Silva dos Santos Universidade Federal Rural do Rio de Janeiro https://orcid.org/0009-0004-2661-6660
Henrique Vieira de Mendonça Universidade Federal Rural do Rio de Janeiro https://orcid.org/0000-0001-7242-5110

DOI:

https://doi.org/10.17765/2176-9168.2025v18e12739%20

Keywords:

Bioremediation, Bioresource, Carbon assimilation, Photosynthesis

Abstract

Esta pesquisa avaliou o cultivo da microalga Spirulina platensis DRH 20 em fotobiorreatores horizontais operados em batelada por 8 dias sob duas intensidades luminosas (150 e 300 ?mol m?² s?¹). A maior irradiação resultou em melhor desempenho do cultivo, com taxa de crescimento específico de 0,35 dia?¹ e tempo de duplicação de 2,1 dias. A biomassa seca variou de 2,2 a 6,5 g L?¹, com produtividade de 0,08 a 0,56 g L?¹ dia?¹ e produtividade por área de 50 g m?² dia?¹. A biofixação de CO? apresentou valores entre 128 e 882 mg L?¹ dia?¹, demonstrando o potencial da microalga para mitigação de emissões. Em relação ao tratamento do efluente, foram obtidas remoções de 16,3 a 77% de DBO? e de 12,6 a 61,6% de DQO; para ST, SST e SSV, as remoções foram de 71 a 80%, 79 a 84% e 87 a 88%, respectivamente. A remoção de nutrientes também foi expressiva, com 33 a 98% de NH??, 20 a 96% de nitrogênio orgânico e 35 a 90% de Pt. Dessa forma, o cultivo de S. platensis demonstrou ser eficiente na biorremediação do efluente, permitindo simultânea produção de biomassa com potencial econômico para síntese de macromoléculas de interesse industrial.

Author Biographies

Denise Salvador de Souza, Universidade Federal Rural do Rio de Janeiro

Engenheira Agrícola e Ambiental da Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica (RJ), Brasil.

Mônica Silva dos Santos, Universidade Federal Rural do Rio de Janeiro

Discente de Mestrado do Programa de Pós-graduação em Engenharia Agrícola e Ambiental da Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica (RJ), Brasil.

Henrique Vieira de Mendonça, Universidade Federal Rural do Rio de Janeiro

Doutor em Biodiversidade e Conservação da Natureza pela Universidade Federal de Juiz de Fora (UFJF). Professor do Programa de Pós-graduação em Engenharia Agrícola e Ambiental da Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica (RJ), Brasil.

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