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In a digestion process, organic matter from human, animal or vegetable waste is broken down by microbiological activity, in the absence of air. This anaerobic process produces a combustible gas, methane, a source of (biogas) energy. The digestion process takes a couple of weeks to a couple of months after which the remaining slurry can be removed, either continuously or batch-wise. Several options are available, ranging from simple digestion techniques to technologically complex designs on a household or municipal scale. A domestic anaerobic digestion technique `fixed dome type' consists of a simple biogas tank with a flat bottom and a round chamber covered with a dome shaped concrete gasholder. The gas is captured in the upper part of the digester. Gas pressure increases with the volume of gas stored, pushing the slurry into a separate outlet tank (see illustration).