Avaliação do processo de mistura na eficiência de produção de biogás por biodigestores

Abstract

Biological reactors are systems that use living organisms to perform processes that benefit humans. These types of systems use the capacity of degradation of the organic matter by microorganisms, generating by-products that can be used in the generation of energy for example. High concentrations of microorganisms are added in a unit called a reactor, together with solutions containing organic compounds, considered pollutants or raw material. For the proper functioning of the biodigesters, microorganism retention structures and mix promotion are developed to keep them inside the reactor and facilitate the access of the microorganisms to the organic compounds, since some of them do not move. Therefore, this work evaluates in greater detail the influence of the mixing process on the production of methane in biodigesters. The biodigesters were made with 10 mm PVC tubes, where a funnel, baffle and PVC pipe ¾ were inserted in the inner part to direct the methane path to the outlet through the tap nozzle, where on the outside there was a drain made from a crystal hose, which directed the methane to the gas scrubber. Still added in the R2 in the interior, chincanas that aided the agitation, a propeller and an iron rod that went until the outside being fixed in a motor. The R1 had a good yield of biogas production but had some problems the main factors were the drop in pH and the complexity of the substrate used (formed by large and complex molecules), thus, requiring a longer time in contact with bacteria methanogenic. The agitation system used may have been the reason why R2 did not perform well. Stirring promotes good contact between the microorganisms and the food, good distribution of the buffer compounds. However, the spin speed was high, destroying the mud flakes.