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Anaerobic Digestion of farm and food processing residues GoodPractice Guidelines Page48 Appendix 5 Summary of management options for farm residues Storage, treatment, then disposal Option Anaerobic Digestion Merits • Good odour control. • Energy production. • Valuable digestate: fibre (soil conditioner), and liquor (liquid fertiliser). • Continuous flow process. • Improves storability. • Ease of handling. • Reduces spreading costs. • Reduces methane emissions. Problems • High capital costs for full system. • Operational costs. • Needs to be integrated into whole business. • Requires daily management. Conclusions • Comprehensive. Management driven. • May entail a separate business. • Suitable for producers with a specific waste management problem, and are prepared to give extra commitment to overcome problems Aeration Systems • Mixes at same time as it aerates to maintain consistency. • Various types and techniques of aeration. • Reduced BOD and odour. • Management important. • Medium capital costs. • Some operational costs. • Not applicable to high dry matter slurries > 4%. • An option for thin slurry odour control. Composting of manures and for Fibrous Solids • Alleviates nuisance odours if properly managed. • Markets already in existence. • Many organic wastes can be composted. • If badly managed can cause odour problems and emmissions. • High marketing cost. • Medium/high capital costs associated with requirement for covered yards and concreted areas. • Management and operational costs. • May entail a separate business. • Suitablefor producers that are prepared to give extra commitment to waste management problems. • Requires marketing. Mechanical seperation • Reduces the size of the storage tanks required. • Reduces capping over the top of the store. • Slurry easier to pump. • Produces a saleable fibre. Enhanced utilisation of the liquid on the crops.PDF Image | Anaerobic Digestion Of farm and food Processing residues The development of a sustainable industry
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