Abstract

DEL REAL OLVERA, Jorge  and  PRIETO GARCIA, Francisco. Influence of diet on the methanogenic activity in an anaerobic digester. RTQ [online]. 2012, vol.32, n.3, pp. 181-189. ISSN 2224-6185.

Four main groups of bacteria coexist in the anaerobic digestive process, being the most important the methanogenics, which have like habitual means the stomach of the ruminants. An originating methanogenics microbial partnership of the bovine ruminal fluid was used to investigate the influence in the characteristics of the feeding on a digester anaerobic in the depuration of vinasses originating of a distillery, by means of the degradation of its organic matter expressed as COD and the generation of biogas. The results show a significant impact in the degradation, when two classes different from substrate is used. On one hand, those poured generated when distilling natural juice of cane showed smaller biodegradation level but bigger instability in the process; while the waste urinated when distilling crystallized juice exhibited an erratic behavior, what hinders the control of the digester. A following variation the concentration of the feeding modifies among 5, 10 and 15%, giving the one poured respectively each 24, 48 and 72 hours. The data demonstrate that the worst operation way, is to feed since every 72 hours to the digester even when the concentration of having poured was maximum, its final yield diminishes in 42,72% with regard to the other ones. Nevertheless, similar results were obtained when feeds each 24 or 48 hours to the digester (0,62% of difference), showing similar operation tendencies. In accordance with the above mentioned, conclude that the good way to work this consortium would be to feed every 24 hours with a concentration of 10% in volume of vinasses of natural juice for not surpassing the capacity of self-regulation of the biological system.

Keywords : Anaerobic digestion; vinasses; methanogenics bacteria; biogas.

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