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rpsgroup.com/Ireland Food for Thought Technology Advances Adrian Thompson CIWM & DoENI Consultation Seminar 15 November 2013
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rpsgroup.com/Ireland Contents of Presentation Technology Advances –Anaerobic Digestion –In-Vessel Composting Anaerobic Digestion Pro’s and Con’s In-Vessel Composting Pro’s and Con’s Current Level of Development
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rpsgroup.com/Ireland Anaerobic Digestion What is Anaerobic Digestion Anaerobic – in the absence of air Digestion – material digested by bacteria to break down the product to a sludge / compost like material and produce a gas (biogas) Biogas combusted to produce electricity and heat
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rpsgroup.com/Ireland Public Types of AD and Feedstock Types of AD Wet: Pumped and stirred Dry: Stacked or pushed through as a plug Typical Farm Feedstock Animal manure Silage Waste crops (Potatoes, cabbage etc) Energy crops (e.g. Miscanthus) Dairy wastes More Complex Feedstock Household waste (Separately collected organic) Food processing waste
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rpsgroup.com/Ireland The AD Process
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rpsgroup.com/Ireland Example AD Layout
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rpsgroup.com/Ireland AD Outputs / Pro’s Digestate Potential artificial fertiliser replacement –Whole Digestate –Dry Fraction –Wet Fraction Biogas Can be combusted in an engine to generate electricity and heat
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rpsgroup.com/Ireland AD Considerations / Con’s Electricity Grid Connection Is grid connection possible? Feedstock Are sufficient tonnages of feedstock guaranteed for continuous operation? Are these homogenous in nature? Sufficient Land to Spread Digestate Is there sufficient land to spread the digestate (PAS 110 compliance and closed spreading season)? Monitoring Need for continuous monitoring of the system Finance Significant capex and opex costs
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rpsgroup.com/Ireland In-Vessel Composting What is In-Vessel Composting In-Vessel – in an enclosed system (building or container) Composting – a biological process in which micro-organisms convert organic matter into a stabilised residue
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rpsgroup.com/Ireland Types of In-Vessel Composting & Feedstock's Types of In-Vessel Composting Containers Silos Agitated Bays Tunnels Enclosed Halls Feedstock Green Waste Food Wastes
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rpsgroup.com/Ireland The In-Vessel Composting Process
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rpsgroup.com/Ireland In-Vessel Composting Outputs / Pro’s Outputs Compost (PAS100 / Animal By-Product Compliance) Residual fraction Benefits Green waste and food waste can be the input waste Less sensitive to changes in feedstock input Reduces waste volume Reduces biodegradability of the waste
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rpsgroup.com/Ireland In-Vessel Composting Con’s Large energy usage in aeration and odour control Large capital costs Large area required for compost maturation Product quality and market for final compost Continuous monitoring
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rpsgroup.com/Ireland Current Level of Development Existing Capacity *Source NIEA Public Register SiteWaste TypeTechnology Type NWP Glenside Non-hazardous including biodegradable In-Vessel Composting NWP KeadyOrganicComposting Greenacre CompostingBiodegradableComposting SimproOrganicComposting
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rpsgroup.com/Ireland Future Development Future Capacity *Source rx3 SiteWaste Type Technology Type Annual Capacity (t) B9 Organic Energy LtdCategory 2 and 3 Anaerobic Digestion 50,000
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rpsgroup.com/Ireland Organic Resource Management Facilities *Source rx3
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rpsgroup.com/Ireland Summary Both Anaerobic Digestion and In-Vessel Composting have their place in the market Anaerobic Digestion Energy recovery Digestate – potential fertiliser In-Vessel Composting Potential for a quality compost Can accept food wastes and green waste co-mingled Less sensitive to changes in feedstock quantity and quality
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rpsgroup.com/Ireland For Further Information Contact: Adrian Thompson 028 9066 7914 adrian.thompson@rpsgroup.com
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