Biorremediação de água residuária agroindustrial e biofixação de carbono com cianobactéria Arthrospira platensis DHR 20

Cecília de Mello Mattos da Silva; Mônica Silva dos Santos; Jacob Santana de Lima Neto; Daniel Fonseca de Carvalho; Everaldo Zonta; Henrique Vieira de Mendonça

doi:10.17765/2176-9168.2025v18e12205

Authors

Cecília de Mello Mattos da Silva Universidade Federal Rural do Rio de Janeiro https://orcid.org/0009-0007-6229-0807
Mônica Silva dos Santos Universidade Federal Rural do Rio de Janeiro https://orcid.org/0009-0004-2661-6660
Jacob Santana de Lima Neto Universidade Federal Rural do Rio de Janeiro https://orcid.org/0009-0006-3441-7383
Daniel Fonseca de Carvalho Universidade Federal Rural do Rio de Janeiro https://orcid.org/0000-0001-7629-9465
Everaldo Zonta Universidade Federal Rural do Rio de Janeiro https://orcid.org/0000-0001-8106-0504
Henrique Vieira de Mendonça Universidade Federal Rural do Rio de Janeiro https://orcid.org/0000-0001-7242-5110

DOI:

https://doi.org/10.17765/2176-9168.2025v18e12205

Keywords:

Biomass, Cattle farming, Microalgae, Photobioreactor

Abstract

Microalgal biomass offers notable benefits as promising raw materials for sustainable production due to its macromolecules. In the present study, the microalga Arthrospira platensis DHR 20 was cultivated in two interconnected sets of vertical flat panel photobioreactors (FBRPs), using anaerobically digested livestock wastewater (ARGDA) as substrate. The process was divided into 5 phases with variations in the operational substrate volume of 1 L, 5 L, 10 L, 15 L and 20 L. Dry biomass reached a maximum of 5.7 g L-1, and productivity reached peak at 0.74 g L^-1. The highest rate of CO2 biofixation achieved was 1213.46 mg L^-1 d^-1, demonstrating a high potential for air purification. The maximum ?max and shortest doubling time were found when FBRPs were fed 15 L every 2 days. Regarding bioremediation, the biomass assimilation percentages were between 65.8% and 87.1% COD, 82.2% and 85.8% TOC, 62.5% and 93% NO3-, 90.4% and 99.7% of NH₄+, and 86.5% and 98.5% of Ntotal. Overall, this represents a new sustainable approach to CO2 reduction, with the additional advantage of simultaneously carrying out wastewater bioremediation.

Author Biographies

Cecília de Mello Mattos da Silva, Universidade Federal Rural do Rio de Janeiro

Graduanda em Engenharia Agrícola e Ambiental pela Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica (RJ), Brasil.

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

Mestranda em Engenharia Agrícola e Ambiental pela Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica (RJ), Brasil.

Jacob Santana de Lima Neto, Universidade Federal Rural do Rio de Janeiro

Mestrando em Engenharia Agrícola e Ambiental pela Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica (RJ), Brasil.

Daniel Fonseca de Carvalho, Universidade Federal Rural do Rio de Janeiro

Doutor em Engenharia Agrícola pela Universidade Federal de Viçosa (UFV). Docente Titular da Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica (RJ), Brasil.

Everaldo Zonta, Universidade Federal Rural do Rio de Janeiro

Doutor em Agronomia pela Universidade Federal Rural do Rio de Janeiro (UFRRJ). Docente Titular da 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). Docente Adjunto da Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica (RJ), Brasil.

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