Abstract
The production of methane in the anaerobic digestion process is a proven technology, but it is characterized by low cost-effectiveness. The pretreatment of substrates seems to be a promising technology, which may increase the cost-effectiveness of biogas installations. The aim of the study was to investigate the influence of the comminution and extrusion of maize silage and maize straw silage on the course and yield of anaerobic digestion. The use of a pretreatment (comminution, extrusion) is justified when its energy balance is positive. The greatest increase in the methane yield per dry matter (12.4%) was observed after the extrusion of maize straw silage at 175 °C. The change in the methane yield resulting from the extrusion of maize silage and maize straw silage at 150 °C was small and amounted to 6.4% and 9%, respectively. The comminution caused an increase in the methane yield and accelerated the fermentation of substrates. The methane yield from maize silage was 38.4%, whereas the yield from maize straw silage was only 8.3%.
Highlights
The global economy needs to use waste and by-products to generate renewable energy in order to achieve sustainable development and to protect the climate and natural resources [1]
The comminution of the substrates accelerated the digestion of the substrates and resulted in a higher methane yield
The experiment was conducted to check whether the mechanical pretreatment, as well as digestion
Summary
The global economy needs to use waste and by-products to generate renewable energy in order to achieve sustainable development and to protect the climate and natural resources [1]. Anaerobic digestion (AD) is a proven technology of handling organic waste, which yields high-energy products such as methane and digestate [2]. AD is a promising technology of lignocellulose waste management. Its main components are methane—CH4 (50%–75%), carbon dioxide—CO2 (25%–50%), and the following volatile compounds in trace amounts: water vapor (H2 O), hydrogen sulfide (H2 S), ammonia (NH3 ), hydrogen (H2 ), and oxygen (O2 ). Another product of anaerobic digestion is digestate pulp, which is a valuable fertilizer [3]
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