Abstract
system, the industrial waste system and the municipal waste system including sewage works and sanitary landfills. About 6 million biogas digesters have been installed in the world. A total of 481 landfill gas exploitation projects were reported by 1990. In some countries, the implementation of biomethanation is at an accelerating rate. In spite of these facts, the development of biomethanation in recent decades has not been at a steady pace, neither has an equilibrium been reached geographically and/or in different sectors, namely the rural, industrial and urban sectors. Under the influences of specific conditions, it has experienced ups and downs, and shifts of sectors of
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