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biogas HANDBOOK Figure 3.4 Benchmarks for specific methane yields (PRAßL 2007) The feedstock for AD could contain chemical, biological or physical contaminants. Quality control of all feedstock types is essential in order to ensure a safe recycling of digestate as fertiliser. The potential contaminants for some common AD feedstock types are shown in Table 3.3. Wastes of animal origin require special attention if supplied as substrate for AD. Regulation 1774/2002 of the European Parliament laid down health rules regarding handling and utilisation of animal by-products not intended for human consumption. Table 3.3 Potential load of problem-materials, contaminants and pathogens of some AD feedstock categories Risk Safe Hygienic risks Contains problem materials Risks of contaminants Communal residue material Greenery, grass cuttings Biowaste, Roadside greenery Feedstock Industrial residue materials Vegetable waste, mash, pommace, etc. Expired foodstuff, foods with transport damage Residue from vegetable oil production Agricultural residues Cu and Zn Beet leaves, straw Fluid dung, solid dung Renewable raw Corn silage, grass materials silage Slaughter waste Rumen, stomach-intestinal contents, separated fats, blood flour, etc. Separated- fats Miscellaneous Industrial kitchen waste, household waste The regulation sets out minimum rules and measures to be implemented, indicating which types of animal by-products are allowed to be processed in biogas plants and in which 20PDF Image | biogas HANDBOOK
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