Estudo da potencialidade do glicerol bruto na prospecção de bioprodutos utilizando resíduo de suinocultura como inóculo

Abstract

A by-product of biodiesel production, crude glycerol is a promising promising carbon source for application in anaerobic digestion, with biological production of production of hydrogen and volatile organic acids (VOCs), as well as other value-added bioproducts.value-added bioproducts. To this end, the potential for bioconversion of crude glycerol, in batch reactors under mesophilic conditions using pig farm effluent as inoculum. The study was divided into two phases. The first phase sought to evaluate the best inoculum conditions, four variations: in natura, self-fermented, nitrogenized and freeze-dried. lyophilized, using as a parameter the inoculum that produced the best H2, because the production of organic acids is accompanied by the production of biogas. second stage was to monitor the evolution of the total soluble metabolic produced, every 2 days, for a total period of 20 days, using the inoculum with the best hydrogen production. The highest H2 production was seen using the freeze-dried inoculum (93.068 ± 11.13 mL of accumulated H2). Thus, the test with the freeze-dried inoculum in the second stage produced ethanol, butyric acid and acetic acid at concentrations of (468.22 mmol/L ± 6.83), (306.77 mmol/L ± 11.92) and (217, 84 mmol/L ± 14.96), respectively, with a 55% reduction in COD and a 29% reduction in volatile solids, indicating that the consortium of microorganisms present in the test was directed between the ethanoic, butyrate and acetate routes. Thus, it was observed that anaerobic digestion of crude glycerol can be an alternative for its treatment with consequent generation of bioproducts such as H2, biofuels and organic acids with higher added value, especially butyric acid.