Journal article
Combined polyhydroxyalkanoates (PHA) and 1,3-propanediol production from crude glycerol: Selective conversion of volatile fatty acids into PHA by mixed microbial consortia
Department of Chemical and Biochemical Engineering, Technical University of Denmark1
Center for BioProcess Engineering, Department of Chemical and Biochemical Engineering, Technical University of Denmark2
SINTEF3
The Danish Polymer Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark4
PILOT PLANT, Department of Chemical and Biochemical Engineering, Technical University of Denmark5
Crude glycerol is an important by-product of the biodiesel industry, which can be converted into volatile fatty acids (VFA) and/or 1,3-propanediol (1,3-PDO) by fermentation. In this study, a selective conversion of VFA to polyhydroxyalkanoates (PHA) was attained while leaving 1,3-PDO in the supernatant by means of mixed microbial consortia selection strategies.
The process showed highly reproducible results in terms of PHA yield, 0.99 ± 0.07 Cmol PHA/Cmol S (0.84 g COD PHA/g COD S), PHA content (76 ± 3.1 g PHA/100 g TSS) and 1,3-PDO recovery (99 ± 2.1%). The combined process had an ultimate yield from crude glycerol of 0.19 g COD PHA and 0.42 g COD 1,3-PDO per g of input COD.
The novel enrichment strategy applied for selectively transforming fermentation by-products into a high value product (PHA) demonstrates the significance of the enrichment process for targeting specific bio-transformations and could potentially prove valuable for other biotechnological applications as well.
Language: | English |
---|---|
Publisher: | Elsevier BV |
Year: | 2018 |
Pages: | 180-191 |
ISSN: | 18792448 and 00431354 |
Types: | Journal article |
DOI: | 10.1016/j.watres.2018.02.029 |
ORCIDs: | Burniol Figols, Anna , Varrone, Cristiano , Daugaard, Anders Egede , Skiadas, Ioannis V. and Gavala, Hariklia N. |