Anaerobic Digesters (a case study) - Adrian Joynt.pdf

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This presentation formed part of the Farming Futures workshop "Focus on Renewable Energy".

West Midlands (24th September 2008)

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Anaerobic Digesters (a case study) - Adrian Joynt.pdf

  1. 1. Anaerobic Digester’s -A case study Adrian Joynt Farm Manager Walford & North Shropshire College
  2. 2. ANAEROBIC DIGESTION A simple process first developed by the Chinese
  3. 3. Walford Farm • 500 acres • 220 dairy cows, 100 followers • 300 Lleyn ewes • 155 acres Cereals • 75 acres Maize • 215 acres grass • 50 acres woodland • Environmental Stewardship
  4. 4. The Walford Digester • Life funding • Set up and operation • Problems • Benefits
  5. 5. The AD Process
  6. 6. Why Install an AD Plant? • Demonstrate the technology and the use of AD in Farm Waste management • Maximise potential benefits of AD within a farm based system • Maximise the use of the farm resources • Evaluate the system and component parts • Comment on costs, benefits and viability • Reduces Methane emissions
  7. 7. The Installation • Opportunity to apply for Life funding arose in 1993 • Shropshire County Council helped with grant application • Planning Permission granted in 1993 • Site preparation and Anaerobic Digester installation started February 1994, took 8 weeks • CHP unit commissioned October 1994
  8. 8. The Process • Intake of chopped waste • Feedstock • Retention time • Temperature • End Product utilisation
  9. 9. The 5 Golden Rules • Temperature • Good diet • Temperature • Good mixing • Temperature
  10. 10. What Are The Benefits? • Manageability of products • Odour reduction • Simple technology • Small reduction in BOD • Energy production • Enhanced nutrient availability in separated liquid
  11. 11. Drawbacks • Maintenance • Operator time • Capital investment
  12. 12. Financial Implications • Installation costs £132,500 • Annual running costs £3,500 (excluding farm labour) • Increased nutrient availability £2,000 • Electricity production £10,000 • Eligible for “Double” ROC’s £5,000 • Compost sales £2,500
  13. 13. Potential • Finance (investment) • Sales • Energy production • “Gate” fee on green waste • Summer feed stocks • NVZ regulations

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