Journal
BIORESOURCE TECHNOLOGY
Volume 279, Issue -, Pages 140-148Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.01.125
Keywords
Glycerol; 1,3-Propanediol; Mixed microbial consortia; UASB; Illumina; Clostridium
Funding
- Spanish Ministerio de Economia y Competitividad (MINECO-FEDER/EU) [CTM-2013-44734-R]
- program of Cooperacion Interuniversitaria con America Latina UAM-Santander [CEAL-AL / 2017-14]
- Brazilian agency PDSE/CAPES (Programa de Doutorado Sanduiche) [88881.134642/2016-01]
- Brazilian agency Fundacao de Amparo a Ciencia e Tecnologia do Estado de Pernambuco (FACEPE) [IBPG-0194-3.07/14]
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The 1,3-propanediol (1,3-PDO) yield and productivity from glycerol were studied over a 155-day period. A UASB reactor that also contained silicone support for biomass attachment was used to evaluate the optimal operational conditions and microbiota development. The highest average 1,3-PDO yield was 0.54 and 0.48 mol.mol-gly(-1) when reactor pH was 5.0-5.5 and the applied loading rate was 18 and 20 g-gly.L-1.d(-1) using the pure and crude substrate, respectively. The productivity was close to 7.5 g.L-1.d(-1) for both substrates; therefore, the direct use of crude glycerol can be valorized in practice. Clostridium was the predominant genus for 1,3-PDO production and C. pasteurianum was dominant in the biofilm. Using crude glycerol, C. beijerinckii dropped strongly; some Clostridium population was then replaced by Klebsiella pneumoniae and Lactobacillus spp. The good process performance and the advances in the microbiota knowledge are steps forward to obtain a more cost-effective system in practice.
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