Climate Change InnovationAnaerobic Digestion
AnaerobicDigestion
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Philip Pearson / Steve Price
Anaerobic Digestion Ltd
Modern growing facilities
Attention to detail
APS Production Centres APS Production Centres
• Packing and Distribution Centre
• Middlewich
• Grading and Packing Centre
• Alderley Edge
Climate Change Mitigation
•Reduce
AnaerobicDigestion
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•Re-Use
•Re-Cycle
•Resource Management
•Temperature Integration
•Computerised Irrigation Control
•Fertiliser Management
AnaerobicDigestion
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Reduce
•Fertiliser Management
•Thermal Screens
•Printed Packaging
•Packaging Film Thickness
Re-Use
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Analysis of Business inputs
–Returnable Packaging
–Return run off irrigation water–Return run off irrigation water
–Waste CO2 used to enrich crop
environment
–Re-Use of waste products?
Re-Cycle
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What have A. Pearson & Sons done to
reduce our impact on the environment
through recycling and Resource efficiency?
– Combined Heat & Power– Combined Heat & Power
– Ground Source Cooling
– Anaerobic Digestion
Combined Heat & Power
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CHP Plant
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Award Winning Environmental Work
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• 1999 Mersey Basin
Business in the
Environment
Awards Winner
• 2000 Salad Grower
of the Year
• 2000 Grower of the
Year
• 2008 Tesco
Environment Award
Ground Source Cooling
Co
nd
en
ser
Liquid only 40 to 50oC
Gas / liquid mixture
0 - 10oC
Cool
air inWarm air
Packhouse / Crop Store
Evaporator
Compressor
Co
nd
en
ser
Gas only 5 to 15oC
Gas only
70 - 80oC
air inWarm air
out
Bespoke Software
Logging of all
temperatures
and pressures
Water Tank
APS A.D PlantAnaerobicDigestion
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Closed Loop
• Carbon Dioxide
• Irrigation Water
• Fertiliser
• Bio Methane
•Heat
•Electricity
There’s a flame here somewhere !AnaerobicDigestion
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Initial Gas Test
What is Anaerobic Digestion?AnaerobicDigestion
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• Anaerobic digestion is a natural bacterial
process that converts biomass to energy.
• Biomass is any organic material that comes
from plants, animals or their wastes.
• The Process produces, rather than consumes,
energy.
What is Anaerobic Digestion?AnaerobicDigestion
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Process Stages
Agricultural A.DAnaerobicDigestion
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Slurry PitAnaerobicDigestion
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Manual ScrapeAnaerobicDigestion
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Auto ScrapeAnaerobicDigestion
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Disposal - SpreadingAnaerobicDigestion
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Dry MatterAnaerobicDigestion
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AD LoadingAnaerobicDigestion
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Walking FloorAnaerobicDigestion
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MixingAnaerobicDigestion
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Digestor - ExternalAnaerobicDigestion
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Digestor - InternalAnaerobicDigestion
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Gas StorageAnaerobicDigestion
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Inside MembraneAnaerobicDigestion
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ControlAnaerobicDigestion
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CHPAnaerobicDigestion
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CHP ContainerAnaerobicDigestion
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DigestateAnaerobicDigestion
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Liquid Digestate StorageAnaerobicDigestion
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IntegrationAnaerobicDigestion
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German ModelAnaerobicDigestion
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BarriersAnaerobicDigestion
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• Be aware of Local Legislation and
Public feeling.
•Perceived Odours
•Flammable gas storage issues
•Planning•Planning
•Environmental protection
•Digestate removal
•Electrical connections
•Maintenance & Control
Our ApproachAnaerobicDigestion
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Control & ManagementAnaerobicDigestion
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• Substrate flow
• Chemical Oxygen Demand (COD) value
• Temperature
• pH value
• Redox potential
• Biogas quality (%CH4)
Working PracticesAnaerobicDigestion
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Monitoring AnaerobicDigestion
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Control DevelopmentAnaerobicDigestion
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Thank you
AnaerobicDigestion
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Thank you
