Abstract
Sewer gas (biogas) can be generated from anaerobic decomposition of different waste substances, e.g. from sludge obtained in sewage works, from household refuse and from agricultural waste. In order to run a sewage works economically the managers of the plants are now obliged to show more interest in the maximum usage of this gas. Even though in most of the municipal waste water treatment plants in the Federal Republic of Germany the digesters are available, one quarter of the annual gas production remains unused. In view of the so-called ‘energy crisis’, it seems foolish to burn off sewer gas, a valuable source of energy and one, moreover, produced at high cost. Even in former times sewer gas was used in various ways, for instance as fuel gas for motor vehicles or in agriculture. The cheap oil of the 1960s precluded the utilization of methane gas or prevented its development. Increased oil prices now make sewer gas utilization more and more economical. Further, sewer gas is a constant source of energy, whereas coal and oil, which are used almost exclusively for the production of energy, are not inexhaustible.
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