Caracterização do efluente resultante de biodigestor de materiais recicláveis

Abstract

Anaerobic biodigestion is a process of degradation of organic residues by certain groups of microorganisms in the absence of oxygen. Through this procedure, three by-products result: biomass, effluent and biogas. The effluent is rich in nutrients from the absorption of compounds in the liquid mass during the process. The objective of the present work was to characterize by means of physico-chemical and microbiological analyzes the slurry coming from the anaerobic biodigestion of food waste from the Academic Restaurant of the IFCE - Campus Sobral. Through the analyzed parameters it was possible to quantify the presence of these compounds, as observed, for example, in the Ammonia and DQO values demonstrating the presence of organic matter in the medium, but not as high as the volatile solids content. Already in the pH and in the alkalinity it is possible to visualize that the degradation still continued active, with a favor for the development of methane-forming bacteria, since the medium was neutral. From then on, it is possible to reuse the effluent as an auxiliary in the production process of certain crops, taking into account those that should not be raw food, as other literature indicates, since the presence of total coliforms was detected, but their use in agriculture it is feasible, given the presence of nutrients favorable to the development of certain types of plants.