Abstract: A bioremediation method comprising: providing an alkalinizing acidophilic fungus, contacting an acidic liquid having a pH of 5 or lower with the fungus, and maintaining the acidic liquid under conditions sufficient to permit the fungus to increase the pH of the acidic liquid.

Abstract: The present invention provides a process for the microbiological production of hydrogen from a hydrocarbon-rich deposit, said process comprising the step of modifying the composition of the deposit by the introduction into the deposit of at least one non-native hydrogen producing microorganism selected positively to diversify the microbiological abundance of hydrogen-producing microorganisms in the deposit and for the preferential production of hydrogen over methane.