AI Article Synopsis
- The study explored how different immobilizing hydrogels impact biohydrogen production by a Thermoanaerobacterium isolate, finding that immobilization enhances both substrate conversion and hydrogen production.
- Using alginate-supported cultures resulted in a hydrogen yield of 1.9 mol H(2)/mol glucose after 24 hours, while cationic acrylic hydrogels boosted cell immobilization and achieved a peak production of 3.6 mol H(2)/mol glucose.
- Despite good durability of all tested hydrogels in repeated batch runs, the buildup of gaseous and acidic byproducts hindered continued hydrogen production, redirecting carbon flow towards other metabolites and biomass.
Article Abstract
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 24h 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.
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| http://dx.doi.org/10.1016/j.biortech.2010.01.061 | DOI Listing |
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