A new criterion of mixing quality in anaerobic digester based on the most important process parameters of methane fermentation is proposed. A set of numerical studies of mixing quality in anaerobic digesters of cylindrical shape with various systems of hydraulic mixing was carried out. Comparative analysis using the proposed criterion as well as other known methods of evaluation of mixing quality showed that results of evaluation of mixing quality in anaerobic digester using different methods are consistent with each other and are not contradictory.

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Two systems of hydraulic mixing in a vertical cylindrical anaerobic digester: standard and modernised are discussed in the paper. Numerical investigations that were carried out are focused on a study of hydrodynamic processes in an aerobic digester using two various systems of hydraulic mixing as well as on analysis of the efficiency of methane fermentation process accomplished under different geometric parameters of an anaerobic digester and systems of hydraulic mixing.

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