Annotation: 
                            This  paper  presents  the  results  of  the  influence  of  ultrasonic  treatment  in  the  cofermentation of the cattle manure mixture (cattle) with the leaven from the rumen of ruminants  on the process of 
biogas production. 
Anaerobic digestion was carried out in matinence periodic operation at the mesophilic temperature of 
38 C ̊. As a substrate, a mixture with a content of 70 % cattle manure and 10 % leaven from rumen of ruminants 
was used. Treatment with ultrasound of the mixture was carried out at an intensity of 10 W/cm2 and an amount 
of input energy of 9350 kJ/kg of dry matter (DM), which completely eliminated the processes of stratification 
and sedimentation.
Decomposition  of  organic  matter  (OM)  in  the  periodic  regime  with  the  enzyme  and  ultrasound 
treatment  occurred  within  8  days,  the  usual  substrate  during  this  time  OM  decomposed  3.0  times  less 
(only 14 %).
The process of fermentation of methane in continuous and periodic modes treated with ultrasound, as at 
other temperatures, was stable, as can be judged by the values of volatile fatty acids (VFA) Volatile fatty acids 
(VFAs), alkalinity, pH, and biogas.
The  energetical  efficiency  of  methane  fermentation  is  estimated  by  comparing  the  volume  of  fuel 
(biogas) and heat consumption for technological needs.
As shown by the comparison of efficiency of different regime, the largest amount of commercial energy 
in the form of biogas was obtained in the mode of joint fermentation of a mixture  of cattle manure (cattle) with a 
ferment from the rumen of ruminants treated with ultrasound – 3 times more than without treatment (space).
                        
                        
                        
                            
                            Year of release:                             
                                2020                            
                        
                        
                            
                            Number of the journal:                             
                                2(78)                            
                        
                        
                            
                            Heading:                             Technical sciences and technologies
                        
                        
                     
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