期刊
BIORESOURCE TECHNOLOGY
卷 101, 期 12, 页码 4386-4394出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.01.061
关键词
Microbiological hydrogen production; Thermophiles; Immobilization; Polymer hydrogels; Surface charge
资金
- Italian Minister for University and Scientific Research (MUR) [1756]
The effect of the surface charge of different immobilizing hydrogels on biohydrogen production in batch cultures was investigated using a novel isolate associated to the genus Thermoanaerobacterium. Two crosslinked polysaccharide-based hydrogels and two acrylic hydrogels were tested as polymeric carriers for cell adsorption. Immobilization improved both substrate conversion and hydrogen cumulative production compared to the suspended culture, and a yield of 1.9 mol H-2/mol glucose was observed after 24 h for alginate-supported cultures. Cationic carriers dramatically increased cell immobilization, leading to markedly faster kinetics of substrate degradation and hydrogen production in batch operation, with a peak of 3.6 mol H-2/mol glucose for the acrylic hydrogel HM92. Accumulation of gaseous and acidic metabolites inhibited further H-2 production, shifting the carbon flow to reduced end-products and biomass synthesis. Preliminary tests showed that all the tested hydrogels had good durability and allowed hydrogen production on repeated batch runs. (C) 2010 Elsevier Ltd. All rights reserved.
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