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La sinergia en la codigestión anaeróbica se describe como interacciones positivas entre sustrato y co sutratos. Los efectos sinérgicos aumentan la producción de metano con respecto a la monodigestión. Actualmente, se cuenta con un conocimiento limitado sobre las aplicaciones de la sinergia como parámetro para la solución de problemas operativos en sistemas anaerobios. En este estudio se determinó la sinergia en la codigestión anaeróbica de gallinaza con residuos industriales (melaza de caña de azúcar, lactosuero, y glicerol crudo). Las proporciones de mezclas fueron determinadas a partir de un diseño de mezcla simplex. La sinergia se evaluó en términos de composición de sustrato e inhibición de amoniaco. La sinergia se evidencia cuando reduce la inhibición del amoníaco y aumenta la producción de metano a medida que incrementa la carga orgánica, siendo el efecto más favorable en mezclas terciarias.

This study assessed the breakdown of lignocellulosic biomass (LB) with the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([Emim][Ac]) as a pretreatment to increase the methane yield. The pretreatment was conducted for wheat straw (WS), barley straw (BS), and grape stem (GS) at 120 °C for 120 min, using several LB to [Emim][Ac] ratios (1:1, 1:3, and 1:5 w/w). Pretreatment significantly disrupted the lignocellulose matrix of each biomass into soluble sugars. GS showed the highest sugar yield, which was followed by WS, while BS was slightly hydrolyzed (175.3 ± 2.3, 158.2 ± 5.2, and 51.1 ± 3.1 mg glucose g–1 biomass, respectively). Likewise, the pretreatment significantly reduced the cellulose crystallinity index (CrI) of the resulting solid fractions of GS and WS by 15% and 9%, respectively, but slightly affected the CrI of BS (5%). Thus, BMP tests were only carried out for raw and hydrothermally and [Emim][Ac] (1:5) pretreated GS and WS. The untreated GS and WS showed similar methane yields to those achieved for the solid fraction obtained after pretreatment with an LB to [Emim][Ac] ratio of 1:5 (219 ± 10 and 368 ± 1 mL CH4 g–1 VS, respectively). The methane production of the solid plus liquid fraction obtained after IL pretreatment increased by 1.61- and 1.34-fold compared to the raw GS and WS, respectively.