Abstract
A mixed flora, capable of using natural gas as a carbon substrate, was derived from a laboratory sewage sludge. Fermentations in a cyclone column fermenter, on a 1:1 natural gas/air mixture, resulted in a doubling time of 4.6 h and production of 0.065 mg dry cell mass per square centimeter interfacial area per hour. Foaming problems limited cell concentrations to 6.1 g/l.

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