Use of Agricultural Residues in Anaerobic Digestion for Energy Production | Bentham Science

摘要

There are large amounts of manure and crop residues that could be used for the generationof renewable energy. Anaerobic Digestion [AD] converts the easily degraded part of these materialsinto bio-methane and other gases. Bio-methane can be used for the generation of heat and electricity.Only combinations of manure slurries and crop residues are economic substrates for AD. Crop residuesare lignocellulosic materials that need to be macerated for efficient conversion into biogas.Methane yields for different straw lengths and energy requirements for maceration were compiled.The need for sufficient bioavailable micronutrients was established and methane yields for combinationsof manure slurries and straw are given. Harvesting methods for crop residues are discussed anda model is developed for the effective organic matter in the effluent of the AD plant.AD of straw and manures is, with the present subsidies, economic only where AD is done in cooperativeswith the members delivering straw and manure and taking back the effluent.The large scale of AD of manures and crop residues requires reductions in the costs of harvestingtransport and storage of crop residues and a solution to the phosphate surplus in the regions with alarge concentration of animals.