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Anaerobic Digestion (AD) A sustainable energy production and waste management solution for your business Robert Crow 30 September 2014. Summary. Services offered to SMEs by Abertay University Legislative drivers Economic drivers The science of AD Feedstocks & pre- treatment - PowerPoint PPT Presentation
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Anaerobic Digestion (AD)
A sustainable energy production
and waste management solution for your business
Robert Crow
30 September 2014
Summary
• 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 pre-treatment
• Reactor and pilot scale trials• Process development, design and
optimisation• 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 2016.
• 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
Feedstocks
Pre-Treatment of Feedstocks
• Reduction of feedstock particle size
• Feedstock blending • Feedstock containing
grit or sand• Removal of
packaging /pasteurisation
Source – SLR consulting 2009
Feedstock assessment & process monitoring
• Moisture Content (%)• Total Solids (%) / Volatile Solids (%)• pH• 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 crisis– Category 1 (cannot be
treated by AD)– Category 2 (steam pre-
treated unless manure or milk)
– Category 3 (pasteurised before digestion)
Energy Utilisation
Source SLR Consulting (2008)
End markets for AD digestate?• Horticulture • Agriculture • Brown field
site restoration
• Landfill daily cover
INCREASING VALUE
PROCESSING REQUIREMENT
http://www.wrap.org.uk/content/digestate-compost-agriculture
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?