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Anaerobic Digestion of farm and food processing residues GoodPractice Guidelines Page49 Storage, then disposal Option Weeping Wall Merits • Convenient: all manure or slurry conveyed to one store. • Passive seperation of solid from liquid fraction. • Liquid fraction used as liquid fertiliser. Problems • Medium/high capital cost • Requires storage for the seperated liquid. • Two types of spreading equipment required. • Potential odour problems.. Conclusions • Practical option for dairy and pig farms. Manure/solid residue storage • Allows for better timing of applications to land, as the residues are stored and then spread when required. • Convenient at cleaning out times. • Low capital costs. • Rainfall causes effluent run- off and nutrient loss. • Potential risk of pollution. • Commonly practised. • Siting of manure/solid residues subject to MAFF Code of Good Agricultural Practice for Protection of Water. Liquid residue storage • Allows for better timing of applications to land, as the residues are stored and then spread when required. • Convenient at cleaning out times. • Problems can occur with the capping of stores. • Requires a powerful mixing system. • Energy costs associated with mixing. • Medium capital cost. • Potential odour problems. • Appropriate option in many cases. • Application to land subject to MAFF Code of Good Agricultural Practice for Protection of Water. Direct disposal Spread residues directly to land • Routine process. • Saves storage and treatment costs. • Avoids peak in work load associated with cleaning out stores, yards etc. • Access to land may be restricted at certain times of the year. • Potential risk of pollution due to run off, particularly in high rainfall areas. • Poor utilisation of nutrients. • Potential damage to soil structure by application machinery. • Still an option in limited cases, subject to MAFF Code of Good Agricultural Practice for Protection of Water. Direct disposal Export manure from Farm via Contractors • Limited farm handling facilities required. • Low management input. • High charges on a continual basis. • Loss of nutrients from the farm. • Appropriate where the farm has no land for spreading. Dry manure as fuel (poultry) • Income from sales. • Continual off-take from farm. • Reduces the requirement for storage. • Applies only to dry poultry manures eg broiler litter. • Low price paid to the farmer. Nutrients lost from the farm ie not recycled back to the land. • Appropriate where the farm has no land for spreading. Derived from Department of Trade and Industry, Agriculture and Forestry Fact Sheet 2. November 1993.PDF Image | Anaerobic Digestion Of farm and food Processing residues The development of a sustainable industry
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