This work reports on the separation of biohydrogen using a hollow-fiber PDMS membrane. The performance of the module was evaluated using binary CO2/H2 (35-65 vol.% H2 content) and ternary CO2/H2/H2S mixtures (50 vol.% H2, 50 vol% CO2, 25-175 ppm H2S) and the effect of recovery and gas composition (with special focus on hydrogen sulfide content) was revealed. H2S is a potential impurity of the raw gas coming from steady-state, dark fermentative hydrogen producing bioreactors. The results indicated that H2S could have a concentration-dependent impact on membrane behavior and affected the obtainable CO2/H2 selectivity. The outcomes were thoroughly compared to other relevant gas separation reports found in the literature. Evaluating the impacts of trace-level substances present in the gaseous mixture containing biohydrogen may help to design effective purification system based on membrane technology for the hydrogen economy.
- Biohydrogen purification pdms membrane gas separation hydrogen sulfide
ASJC Scopus subject areas
- Analytical Chemistry
- Filtration and Separation