Produção biológica de hidrogênio a partir de efluente de suinocultura suplementado com sacarose

Abstract

There are several processes used to produce hydrogen, which tend to consume a great part of the energy they produce and/or depend on fossil fuel consumption making them inefficient and harmful to the environment. Biological hydrogen production by fermentation of organic matter residue is considered a promising alternative because it is a process linked to the degradation of organic matter used. The organic waste from pig activity have high concentration of organic matter and can be used as a substrate for the production of methane and hydrogen. The research objective was to evaluate the biological production of hydrogen from a real substrate, the effluent from swine supplemented with sucrose as co – substrate using anaerobic fluidized bed reactor (AFBR). The support material for the biomass adhesion was expanded with a diameter between 2.80 and 3.35 mm clay. We adopted an adjustment period where the TDH 8-4h varied between and supplementation was 10 g/L sucrose. By reducing the TDH for 2h, began variation of supplementation 10-0g/L sucrose. The reactor was operated for 152 days. During the experiment the pH was not controlled, the pH effluent ranged from 7.85 ± 0.22 to 3.44 ± 0.19. The results showed that the HRT during 2 hours with 6g / L sucrose maximum yield of hydrogen ( HYmáx. ) 4.90 molH2.mol sucrose and maximum volumetric production ( HPRmáx. ) of 1.62 h- 1 occurred . 1.The L- soluble metabolites produced during operation Ralf were acetic acid ( from 9.93 to 36.87 %) , butyric acid ( 1.92 to 52.70 %) , propionic acid ( 6.63 to 29.11 %) , caproic acid ( 0.14 to 13.36 %) and ethanol ( 10.31 to 67.88 % ), and ethanol was present in higher concentrations metabolite by the TDH 2h/6g . The data showed the need for adding a source of carbon for better efficiency in biological hydrogen production by using swine effluent as substrate.