Anaerobic digestion of stillage residue from the ethanol and wine industry is a promising method to provide energy and reduce waste. In addition

biogas slurry and biogas residue can be used as biological fertilizer after anaerobic digestion. In this study

anaerobic digestion of stillage was tested at medium temperature

meanwhile

the element changes and the feasibility of biogas slurry used as biological liquid fertilizer were investigated. The cumulative biogas yields from corn ethanol stillage

Maotai-flavor stillage

Luzhou-flavor stillage and cassava fuel ethanol stillage were 607.4

578.7

434.2

122.3 ml·g-1(based on VS)

respectively. The methane contents of biogas ranged from 60% to 70%. The biogas potential of stillage was proportional to degradation of substrates. The ions content of biogas slurry was in the range of the standard of biological liquid fertilizer.