Biohydrogen's hydrogen produced via biological processes. Biohydrogen isn't the same as biological hydrogen produced by algae. Fermentation Biohydrogen gas can be extracted from biomass through dark fermentation and/or photofermentation by bacteria. Fermentation plants Fermentative hydrogen production plants are proposed industrial plants for the production of hydrogen. They'd typically involve processes such as thermophilic fermentation, dark fermentation and/or photofermentation and gas cleani… (More on Biohydrogen)