Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

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

677 views

Published on

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

West Midlands (24th September 2008)

Published in: Technology
  • Be the first to comment

  • Be the first to like this

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

×