| Autor: |
Roume H; Faculty of Bioscience Engineering, Center for Microbial Ecology and Technology (CMET), Ghent University , Gent , Belgium., Arends JB; Faculty of Bioscience Engineering, Center for Microbial Ecology and Technology (CMET), Ghent University , Gent , Belgium., Ameril CP; Faculty of Bioscience Engineering, Center for Microbial Ecology and Technology (CMET), Ghent University , Gent , Belgium., Patil SA; Faculty of Bioscience Engineering, Center for Microbial Ecology and Technology (CMET), Ghent University , Gent , Belgium., Rabaey K; Faculty of Bioscience Engineering, Center for Microbial Ecology and Technology (CMET), Ghent University , Gent , Belgium. |
| Jazyk: |
angličtina |
| Zdroj: |
Frontiers in bioengineering and biotechnology [Front Bioeng Biotechnol] 2016 Sep 26; Vol. 4, pp. 73. Date of Electronic Publication: 2016 Sep 26 (Print Publication: 2016). |
| DOI: |
10.3389/fbioe.2016.00073 |
| Abstrakt: |
Given the large amount of crude glycerol formed as a by-product in the biodiesel industries and the concomitant decrease in its overall market price, there is a need to add extra value to this biorefinery side stream. Upgrading can be achieved by new biotechnologies dealing with recovery and conversion of glycerol present in wastewaters into value-added products, aiming at a zero-waste policy and developing an economically viable process. In microbial bioelectrochemical systems (BESs), the mixed microbial community growing on the cathode can convert glycerol reductively to 1,3-propanediol (1,3-PDO). However, the product yield is rather limited in BESs compared with classic fermentation processes, and the synthesis of side-products, resulting from oxidation of glycerol, such as organic acids, represents a major burden for recovery of 1,3-PDO. Here, we show that the use of an enriched mixed-microbial community of glycerol degraders and in situ extraction of organic acids positively impacts 1,3-PDO yield and allows additional recovery of propionate from glycerol. We report the highest production yield achieved (0.72 mol 1,3-PDO mol -1 glycerol ) in electricity-driven 1,3-PDO biosynthesis from raw glycerol, which is very close to the 1,3-PDO yield reported thus far for a mixed-microbial culture-based glycerol fermentation process. We also present a combined approach for 1,3-PDO production and propionate extraction in a single three chamber reactor system, which leads to recovery of additional 3-carbon compounds in BESs. This opens up further opportunities for an economical upgrading of biodiesel refinery side or waste streams. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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