Abstract
This study evaluated the operation of a hybrid anaerobic reactor fed with algal biomass cultivated in effluent from the brewery industry. Three stages of operation were distinguished during the 72 days of semi-continuous functioning of the reactor: Stage 1 (S1), in which algal biomass was used as substrate; Stage 2 (S2), in which 10% (v/v) of the algal biomass was substituted by olive mill wastewater (OMW); and Stage 3 (S3), in which algal biomass was heat pre-treated. During S1, a loss of solids was observed, with an increment of organic matter in the outlet. The substitution of 10% of the volume of algal biomass by OMW tripled the methane productivity obtained in the previous stage by digestion of pure algal biomass. Heat pre-treatment was not efficient in rupturing the cell wall, and consequently did not have any effect on the increase in biogas production. The complementarity of substrates in the assessed conditions led to better results than the pre-treatment of the algal biomass.
Highlights
This study evaluated the operation of a hybrid anaerobic reactor fed with algal biomass cultivated in effluent from the brewery industry
Three stages of operation were distinguished during the 72 days of semi-continuous functioning of the reactor: Stage 1 (S1), in which algal biomass was used as substrate; Stage 2 (S2), in which 10% (v/v) of the algal biomass was substituted by olive mill wastewater (OMW); and Stage 3 (S3), in which algal biomass was heat pre-treated
The substitution of 10% of the volume of algal biomass by OMW tripled the methane productivity obtained in the previous stage by digestion of pure algal biomass
Summary
One of the most important processes for converting biomass into energy is anaerobic digestion, which consists of the biochemical conversion of organic matter into biogas. Energetic valorization of algal biomass in a hybrid anaerobic reactor Paula Assemany a, *, Isabel de Paula Marques b, Maria Lúcia Calijuri a, Teresa Lopes da Silva b, Alberto Reis b a Universidade Federal de Viçosa/Civil Department, Avenida PH Rolfs s/n, 36570-900, Viçosa, MG, Brazil b LNEG, National Laboratory of Energy and Geology/Bioenergy Unit, Estrada do Paço do Lumiar 22, 1649-038, Lisbon, Portugal article info
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