Three operational variants based on 5 min long mixing of the fermenter content (75 L) with an agitator and then 20-40 min long cycles of its switching off were used to det. the effect of mixing method on biogas prodn. in a 12 days long process. The highest biogas yield" (35 L/day) was achieved for the variant with 40 min long cycle of the switched off agitator while the highest MeH content and lowest H2S content in the biogas (67.4% and 1564 ppm, resp.) were achieved for the variant with 20 min long cycle of the switched off agitator.