Spiritinių žlaugtų perdirbimas į biodujas

Abstract

Purpose of this paper is to analyse the possibilities of anaerobic digestion to biogas of spirit stillage. Spirit stillage was processed in anaerobic digester at mesophilic environment. Vertical type biogas digester of 20 liters was used for experiments. Applied organic load was 1 kg/(m3∙d). In spirit stillage was found organic carbon 48,3 %, nitrogen 5,43 %, the C:N ratio is 8,9:1. This material may not be easily processed into biogas due to low C:N ratio. The biogas yield from 1 kg of spirit stillage was 50,6 liters or 652,8 l/kg of dry matter and 685,2 l/kg of dry organic matter. Methane concentration in biogas was 57,7 %. Energy value of 1 kg spirit stillage is 1,03 MJ or 13,3 MJ from 1 kg of dry matter and 14,0 MJ from 1 kg of dry organic matterVytauto Didžiojo universitetasŽemės ūkio akademij