Optimization of Biogas Production from Anaerobic Fermentation of Corn Stalk by Combination Alkali Pretreatment

Abstract

In order to explore the influence of alkali concentration, solid-liquid ratio, pretreatment time and component ratio on biogas production from corn stalk anaerobic fermentation in the pretreatment process of combined alkali, four factors and five levels of quadratic orthogonal rotary combination design experiment were used to optimize the technological conditions for biogas production from corn stalk anaerobic fermentation by combined alkali pretreatment, and corresponding mathematical model is established. The results showed that the regression equation was significant and the fitting condition was good. The four factors affected the biogas production of corn stalk in the order of composition ratio, treatment time, alkali concentration and solid-liquid ratio. The optimum combination of process parameters was as follows: alkali concentration was 6%, solid-liquid ratio was 1:5, treatment time was 4.5 days, component ratio was 1:1.25. Under the optimum conditions, the production of biogas from corn stalk anaerobic fermentation was the highest.