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Biogas treatment with recovery of nutrients from centrate in an outdoors high rate algal pond through algae-bacteria systems

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D_Marin   The upgrading of biogas coupled with centrate treatment was evaluated in an outdoors photobioreactor interconnected to an absorption column of CO2 and H2S from September to December 2016.

   The maximum recorded CH4 concentration in the biomethane was 94%, with total removal of H2S and removal efficiencies of CO2 ranging from 70% to 90% depending on the environmental conditions.

 

D. Marín, E. Posadas, R. Lebrero, R. Muñoz

Departamento de Ingeniería Química y Tecnología del Medio Ambiente. Universidad de Valladolid. C/ Real de Burgos, s/n, Sede Doctor Mergelina. CP 47011 - Valladolid

   Competing interests: The author has declared that no competing interests exist.

   Academic editor: Carlos N Díaz.

   Content quality: This paper has been peer reviewed by at least two reviewers. See scientific committee here

   Citation: D. Marín, E. Posadas, R. Lebrero, R. Muñoz, 2017, Biogas treatment with recovery of nutrients from centrate in an outdoors high rate algal pond through algae- bacteria systems, IV International Conference of Odours and VOCs in the Environment, Valladolid, Spain, www.olores.org.

   Copyright: 2017 olores.org. Open Content Creative Commons license. It is allowed to download, reuse, reprint, modify, distribute, and/or copy articles in olores.org website, as long as the original authors and source are cited. No permission is required from the authors or the publishers.

   ISBN: 978-84-697-7359-8

   Keyword: Biogas upgrading, biomethane, microalgae, outdoors conditions, wastewater treatment.

 

Abstract

   The upgrading of biogas coupled with centrate treatment was evaluated in an outdoors photobioreactor interconnected to an absorption column of CO2 and H2S from September to December 2016. The maximum recorded CH4 concentration in the biomethane was 94%, with total removal of H2S and removal efficiencies of CO2 ranging from 70% to 90% depending on the environmental conditions.

   The treatment of centrate reached removals of total organic carbon from 57 ± 4% to 82 ± 5%, inorganic carbon removals of 100 ± 1%, total nitrogen removals from 80 ± 6% to 89 ± 7% (with total removal of N-NH4+) and removals of P-PO43- from 72 ± 4% and 94 ± 2%. Finally, the deterioration of the environmental conditions led into a decrease of algal biomass productivity from 15 to 7.5 g / (m2·d).

 

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