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A non-sterile heterotrophic microalgal process for dual biomass production and carbon removal from swine wastewater

Lookup NU author(s): Professor Maria Orta Ledesma, Dr Sharon Velasquez OrtaORCiD

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Abstract

This study addresses the development of a non-sterile heterotrophic microalgae process, mainly using Scenedesmus sp., for the treatment of wastewater with high concentration of organic matter and biomass production. Urban and swine wastewaters were used as source of organic carbon. A C:N ratio of 3.4:1 provided a maximum biomass concentration of 1.22 g/L on day 13 using autotrophic conditions. Using the same C:N ratio under dark conditions a maximum biomass concentration of 1.1 g/L was measured on day 14. Heterotrophic growth removed 81.6% of the total organic carbon (TOC), 83.7% of the chemical oxygen demand (COD) and 85.1% of the biochemical oxygen demand (BOD₅). Results indicated that the application of a non-sterile heterotrophic process contributed to the removal of organic matter with the advantage of biomass generation, and although more detailed analysis is needed, it is likely due to the microalgae-bacteria association.

Publication metadata

Author(s): Montaño-San-Agustin D, Orta-Ledesma MT, Monje-Ramírez I, Yáñez-Noguez I, Luna-Pabello VM, Velasquez-Orta SB

Publication type: Article

Publication status: Published

Journal: Renewable Energy

Year: 2022

Volume: 181

Pages: 592-603

Print publication date: 01/01/2022

Online publication date: 10/09/2021

Acceptance date: 06/09/2021

Date deposited: 24/09/2021

ISSN (print): 0960-1481

ISSN (electronic): 1879-0682

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.renene.2021.09.028

DOI: 10.1016/j.renene.2021.09.028

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