Biogas is a gas mixture, mainly consisting of methane and carbon dioxide, resulting from the biological process of anaerobic digestion of various organic materials [1]. The percentage of methane in biogas will vary depending on the process conditions and the type of organic matter fermented [2-3]. The purpose of this article is to show the differences in CH_4 production from two different anaerobic systems. The first system called Batch Environmental System (BES) function as total isolation system. The needed temperature depends on environment. The second system called Batch Constant Temperature System (BCTS) function as total isolation system but the applied temperature here is constant in whole experimentation time. Applied methods consists in checking the changes in temperature, differences in stirring speed and in determining the moisture contents together with mineral-organically material. Moisture content, mineral-organically material and pH are one of the main "sources" in order to predict theoretical biogas yield.
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