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Abstract
Biogas is hydrogen or methane gas produced by fermentation from 
biomass. The decomposition of methane biomass occurs with the participation of 
three different bacteria. In the nutrient chain, the last bacteria feed on the 
anterior bacteria. The first form is hydrolytic bacteria, the second is acid-forming 
bacteria, the third is methane-forming bacteria. In the production of biogas, not 
only bacteria belonging to the methanogenic class are used, but also all three 
species. Biogas production does not exclude the release of methane into the 
environment. Methane pollutes evaporation 21 times stronger than CO2 and 
stores in the atmosphere for up to 12 years without decay. Methane reduction is 
a measure to prevent global heat.
Key words: 
biogas, anaerobic fermentation, droppings, biodegradation, 
manure, compost, methane, aeration. 

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