The present invention provides a system of baiting and growing microorganisms on a gelatinous matrix. A bioreactor is provided wherein the bioreactor provides an environment conducive to the breakdown of organic aqueous material and the production of hydrogen from microorganisms and restrictive to the production of methane from methanogens. The bioreactor includes substrates coated with a gelatinous matrix, wherein the gelatinous matrix coating is replenished by additional coating material pumped into interior channels of the substrates wherein the substrates are permeable by the coating.