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

Authors

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

DOI:

https://doi.org/10.5327/Z21769478787

Keywords:

microalgae, biomass, tertiary wastewater treatment, dairy industry, lipids

Abstract

Secondary wastewaters from the dairy industry may cause eutrophication of water bodies when not properly treated, mainly because they contain nutrients such as phosphorus and nitrogen. Tertiary treatment using microalgae could be an adequate solution for Minas Gerais State, the largest Brazilian milk producer, contributing to the reduction of environmental impacts, as well as providing biomass for oil extraction, and obtaining active compounds and inputs (including proteins) for animal feeding. In this work, dilutions (with distilled water) of the secondary wastewater from the dairy industry were evaluated to cultivate Chlorella vulgaris in a bench-scale tubular photobioreactor. Theresults indicate the feasibility of using wastewater from the dairy industry, after secondary treatment, to cultivate microalgae, showing cell growth like that obtained in control cultures (Bold basal medium). The secondary wastewater without dilution (100% wastewater) provided the best condition for biomass production. The biomass obtained in wastewater showed no differences from the biomass obtained in the Bold basal medium (control) in terms of protein, lipid content, or fatty acid profile.

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