Biogas is a very interesting source of renewable energy. However, its desulfurization is necessary, and sometimes an adjustment of the methane (CH4) concentration (upgrading), by reducing the carbon dioxide (CO2) concentration. The removal or capture of CO2 can be carried out by biological methods, with microalgae being the most used microorganisms, given their high CO2 assimilation capacity.
However, high CO2 concentrations inhibit the microalgae growth, which makes it difficult to apply. In the present study, a microalgae consortium of leachate from landfills has been isolated to study the effect of CO2 concentration on its growth. Two bubble column photobioreactors were built with an inner diameter of 100 mm and a working volume of 8 L.
Saldarriaga, L. F1,2, Ramírez, M.1, Almenglo, F., Gómez J.M, Cantero, D1
1 Departamento de Ingeniería Química y Tecnología de Alimento. Facultad de Ciencias. Universidad de Cádiz. Instituto Universitario de Investigación Vitivinícola y Agroalimentario (IVAGRO). Av. República Saharaui S/N. 11510 Puerto Real, Cádiz, Spain
2 Departamento de Química. Universidad del Atlántico. Km 8. Vía Puerto Colombia, Colombia.
* martin.ramirez@uca.es
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: Saldarriaga, L.F.; Ramírez, M.; Almenglo, F.; Gómez J.M.; Cantero, D.; 2017, CO2 capture through a consortium of isolated microalgae of landfill leachate with column photobiorreators, IV International Conference of Odours and VOCs in the Environment, Valladolid, Spain, www.olores.org.
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ISBN: 978-84-697-7359-8
Keyword: Kinetic model, ammonium, nitrate, Nannochloropsis
Abstract
Biogas is a very interesting source of renewable energy. However, its desulfurization is necessary, and sometimes an adjustment of the methane (CH4) concentration (upgrading), by reducing the carbon dioxide (CO2) concentration. The removal or capture of CO2 can be carried out by biological methods, with microalgae being the most used microorganisms, given their high CO2 assimilation capacity.
However, high CO2 concentrations inhibit the microalgae growth, which makes it difficult to apply. In the present study, a microalgae consortium of leachate from landfills has been isolated to study the effect of CO2 concentration on its growth. Two bubble column photobioreactors were built with an inner diameter of 100 mm and a working volume of 8 L. The effect of CO2 concentration (5, 10, 20 and 30% v/v) was studied, keeping the total air gas flow constant at 0.1 vvm. It was used Combo culture medium, enriched 5 times in nitrogen (50% N-NH4+ and 50% N-NO3-).
The maximum biomass concentrations reached after 17 days were 1.71, 1.53, 1.11 and 0.60 g/L for 5, 10, 20 and 30% v/v CO2, respectively. The maximum ammonium and nitrate consumption rates was reached at 5% v/v of CO2 being of 11.4 mg N-NH4+ /L/d and 7.9 mg N-NO3- /L/d, respectively.
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Wastewater pumping stations sometimes become sources of emission of odours and polluting compounds that can influence on the staff health, the equipment and facilities state and the perception of general public about this activity.
Odour control is an increasing concern in WWTPs. Physical/chemical end-of-the-pipe technologies for odour abatement are relatively expensive and present high environmental impacts. Biotechnologies, on the other hand, have recently emerged as cost-effective and environmentally friendly alternatives but are still limited by their investment costs and land requirements. A more desirable approach to odour control is the prevention of odorant formation.