Anaerobic granular sludge as a biocatalyst for 1,3-propanediol production from glycerol in continuous bioreactors

作者：Gallardo R; Faria C; Rodrigues L R; Pereira M A; Alves M M^*

来源：Bioresource Technology, 2014, 155: 28-33.

DOI：10.1016/j.biortech.2013.12.008

• Anaerobic granular sludge
• Glycerol
• 1,3-Propanediol
• HRT
• Microbe community structure

1,3-Propanediol (1,3-PDO) was produced from glycerol in three parallel Expanded Granular Sludge Blanket (EGSB) reactors inoculated with granular sludge (control reactor-R1), heat-treated granular sludge (R2) and disrupted granular sludge (R3) at hydraulic retention times (HRT) between 3 and 24 h. Maximum 1,3-PDO yield (0.52 mol mol (1)) and productivity (57 g L (1) d (1)) were achieved in R1 at HRTs of 12 and 3 h, respectively. DGGE profiling of PCR-amplified 16S rRNA gene fragments showed that variations in the HRT had a critical impact in the dominant community of microorganisms. However, no appreciable differences in the bacterial population were observed between R2 and R3 at low HRTs. Production of H-2 was observed at the beginning of the operation, but no methane production was observed. This study proves the feasibility of 1,3-PDO production in EGSB reactors and represents a novel strategy to valorise glycerol generated in the biodiesel industry.

• 出版日期2014-3