Both hydrogen and methane are very attractive alternative
fuels [1]. Hydrogen is slowly being introduced into the vehicle
market, and has enormous potential due to its high energy efficiency
and the possibility of use in zero-emission vehicles [1], while
methane is already available on the market as a gaseous biofuel and
is used in combustion engines. Therefore, the utilization of the
acidic effluent obtained from the hydrogen production process for
methane production is not only appropriate for environmental
treatment but also for energy recovery.