engleski

The influence of fermentation on the proportion of lignin in the silage production

Lignocellulosic biomass consists of cellulose, hemicellulose and lignin. Decomposition of such materials is difficult since cellulose is strongly cross-linked and protected by lignin, which disables the access to cellulose for enzymes and microbes. Hence, certain pre-treatments are carried out for the purpose of destruction of the lignocellulosic structure. For the optimum pretreatment, it is important that the process can make all parts of the biomass available for the formation of bioproducts during further processing. Numerous physical, chemical and biological pretreatments are described for the conversion of lignocellulosic materials ; most often, they include the addition of acid, which could have various negative effects on the energy production and by-product utilization, especially in the biogas production. In this research, the biological method of anaerobic fermentation which occurs during the ensiling process was investigated as a pretreatment of lignin of Arundo donax L., which has a common share of lignin of approx. 15 %. The influence of the fermentation on the lignin content was examined in the production of corn silage and ensiled A. donax L. In order to determine the proportion of lignin and the influence of the anaerobic fermentation on the investigated samples, the lignin content was determined prior and after the pretreatment. It was determined that the ensiling had a positive effect, and that the lignin content was decreased during the pretreatment.

lignin, pretreatment, fermentation, ensiled A. donax L., corn silage

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