Anaerobic Digestion (AD) - Scottish Biofuel Programme

Anaerobic Digestion (AD)
A sustainable energy production
and waste management solution for your business
Robert Crow
30 September 2014
Services offered to SMEs by Abertay University
Legislative drivers
Economic drivers
The science of AD
Feedstocks & pre- treatment
AD process outputs – Energy & Digestate
Factors to consider when installing AD systems
SBP – Abertay AD Expertise
• Biochemical Methane Potential
(BMP) assays
• Feedstock analysis and pretreatment
• Reactor and pilot scale trials
• Process development, design and
• Bespoke training packages offered
developed for operators and
businesses new to the sector
Legislative drivers: Organic waste
EU legislation
Scottish legislation
The Waste (Scotland) Regulations 2012
• All businesses in Scotland that produce over 50kg of food waste
per week require this to be separated and uplifted to a permitted
treatment facility
• A ban on using on using macerators to discharge food waste
into the public sewer is coming into force on the 1st of January
• An energy opportunity exists since the biogas created from AD
can be combusted within a CHP to generate a source of power
and heat.
Economic Drivers
• Landfill tax currently
£80 per tonne of
active waste
• Add on the gate fee!!
• Price of raw
materials increasing
– waste recovery
and adding value is
becoming necessary
Anaerobic Digestion – The science
Source – Renewable Energy Concepts 2013
Pre-Treatment of Feedstocks
• Reduction of feedstock
particle size
• Feedstock blending
• Feedstock containing
grit or sand
• Removal of packaging
Source – SLR consulting 2009
Feedstock assessment
& process monitoring
Moisture Content (%)
Total Solids (%) / Volatile Solids (%)
Volatile Fatty Acids (VFA) (mg/L HOAc)
Methane Yield (ml CH4 /g VS added)
C:N Ratio
Animal By-Products Enforcement
(Scotland) Regulations 2011:
Anaerobic Digestion
• Implemented as a result of
the 2001 Foot & Mouth
disease outbreak and BSE
– Category 1 (cannot be
treated by AD)
– Category 2 (steam pretreated unless manure or
– Category 3 (pasteurised
before digestion)
Energy Utilisation
Source SLR Consulting (2008)
End markets for AD digestate?
• Horticulture
• Agriculture
• Brown field
• Landfill daily
PAS 110 Standard
• Specification that allows
digestate to be
declassified as a waste
– Physical tests
– Chemical tests
– Microbiological tests
– Growth trials
– Stability Tests
Key Issues developing AD systems
• Initial feedstock assessment & feedstock supply
• Process monitoring & measurement essential
• Knowledge exchange between AD technology
providers and operations staff
• Engage SEPA at a early stage
• Consult your local planning officer
• End use of the biogas, heat and digestate
should be considered
Any questions?

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