Biogas yields and composition from oil-extracted halophilic algae residues in conventional biogas plants operated at high salinities

Bioprocess and Biosystems Engineering
Timm AdamietzThomas B Brück

Abstract

CO2-induced climate change drives the development of renewable processes for industrial products. Algae processes can actively fix and convert CO2 into value adding products, such as oils. Algae lipids hence counteract climate change and provide access to renewable commodities. In this context, valorization of algal residues remaining after oil extraction is a challenge for the emerging cyclic bioeconomy. This study focuses on the valorization of oil-extracted algae residues derived from the halophilic strain Scenedesmus obliquus via anaerobic digestion. We examined the effect of prior oil extraction on microbial digestibility and increasing salt content in the substrate with regard to biogas yield and composition. Our cumulative data demonstrate that the supercritical CO2 oil extraction acts as a physical pretreatment that facilitates enhanced hydrolysis of both polymeric call wall carbohydrates and cellular proteins, providing methane yields of 213.2 LN kg-1 VS day-1. Methane yields were 20% higher than literature values obtained with the same algae strain in the absence of prior oil extraction. We obtained these superior results albeit all lipids and nonpolar proteins had been extracted from the biogas substrate. Our data in...Continue Reading

References

Sep 25, 2009·Applied Microbiology and Biotechnology·Peter Weiland
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Dec 3, 2014·Current Opinion in Biotechnology·Peter R MooijRobbert Kleerebezem
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Mar 17, 2017·Bioprocess and Biosystems Engineering·Jan LorenzenThomas Brück

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