Biomethanogenesis Processes of Bird Droppings Mixtures with Substances Containing Lignin Under the Influence of Physical Fields

Abstract

Based on experimental data, recommendations are proposed for intensifying the processes of biomethanogenesis of mixtures of bird droppings with substances containing lignin under the controlled action of thermal, magnetic and electric fields and mechanical vibrations for bioreactors of farms. The results of an electromagnetic field modeling in the bioreactor showed both electrical and mechanical effects on the mixture consisting of straw, bird droppings and laboratory inoculum. The conducted experimental studies confirmed the increase in the intensity of mixture processing and a significant increase in the lag phase of the process, a decrease in the cumulative indicators of the biogas and methane output in comparison with the reactor, in which there was no low-frequency electromagnetic field. Experimental confirmation of the favorable effect of the magnetic field on the activity of methane bacteria under the influence of a static magnetic field and a magnetodynamic field at frequency 2 Hz and continuous stirring has been obtained. In addition, the optimal composition of the mixture was determined, which leads to an increase in the biogas yield.