The efficiency of the methane fermentation is affected by the type of substrates used and the rate of the process, which is mainly conditioned by the dynamics of hydrolysis – the first fermentation step. In order to improve the decay of hardly biodegradable material (in the literature called lignocellulosic biomass), pre-treatment of substrates is often applied: heat treatment, chemical treatment, mechanical treatment and other. In this research the heat treatment was carried out, with use of waste heat from the methane fermentation process, which is a difficult material to be stored. The idea of using heat from methane fermentation is an innovative solution with signific-ant economic and ecological aspect. The purpose of this work is to examine the effect of heat treatment on biogas efficiency. The research was carried out on one of the most common biogas substrates, maize silage, which was heated on a steam at 80°C and then heat treated at 100°C.
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