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Bioconversion of residual glycerol from biodiesel synthesis into 1,3-propanediol and ethanol by isolated bacteria from environmental consortia

2011; Elsevier BV; Volume: 39; Issue: 1 Linguagem: Inglês

10.1016/j.renene.2011.08.005

1879-0682

Daniele Misturini Rossi, J. Costa, Elisângela Aquino de Souza, Maria do Carmo Ruaro Peralba, Marco Antônio Záchia Ayub,

Enzyme Catalysis and Immobilization

Residual (raw) glycerol originated from biodiesel synthesis is becoming of great environmental and economical concern due to its ever-growing surplus. In the present study, several bacterial strains were isolated and characterized for their ability to convert this raw glycerol into 1,3-propanediol (1,3-PD) and ethanol. The best producers of both 1,3-PD and ethanol were identified by 16S rDNA sequences to be Klebsiella pneumoniae and Pantoea agglomerans strains. Batch bioreactor cultivations under anaerobic and aerobic conditions were carried out in order to access the kinetics of glycerol consumption and product formation. Results showed that one isolated, K. pneumoniae BLh-1, was able to simultaneously produce up to 9.4 g/L of 1,3-PD with yields of 0.41 mol product mol−1 glycerol, and 6.1 g/L of ethanol with yields of 0.14 mol product mol−1 glycerol under anaerobic conditions, showing great potential for bioprocesses.