BBSRC-DBT Bioenergy Workshop
Biogas / energy production from waste (agricultural, food, municipal) A UK Perspective Keith Waldron
KEY SOURCES OF INFORMATION
Lucy Hopwood (NNFCC)
[email protected] Richard Parker (Renewables East)
[email protected] WRAP UK
Overview • What is AD • Why do we need AD
– Drivers and UK Biogas Market
• How can we achieve AD in the UK? – Sources of biomass – Financial incentives – Improved technologies
• Examples of emerging AD activities • Conclusions
Overview • What is AD • Why do we need AD
– Drivers and UK Biogas Market
• How can we achieve AD in the UK? – Sources of biomass – Financial incentives – Improved technologies
• Examples of emerging AD activities • Conclusions
Biological and chemical stages of anaerobic digestion
Large Organic polymers Carbohydrates Fats Proteins
Soluble Organic monomers Sugars Fatty Acids Amino Acids
Carbonic acids Propionic, Butyric, Acetic Acids Long chain VFAs and alcohols Hydrogen CO2 & NH3
C6H12O6 → 3CO2 + 3CH4 Mesophilic or thermophilic
Hydrogen Acetic acid CO2
CH4 CO2
Agricultural slurries Municipal Solid waste
Sorting / recycling
AD
biowaste
DIGESTER
Food industry
Methane production Over 1-2 weeks
EFFLUENT
BIOGAS COMPRESSION & STORAGE
SEPARATOR ETC
SOLID FIBRE e.g. composted
LIQUID e.g. fertilizer applications
VEHICLE FUEL transport
BOILER GENERATOR Electricity to National Grid
+CHP
Overview • What is AD • Why do we need AD
– Drivers and UK Biogas Market
• How can we achieve AD in the UK? – Sources of biomass – Financial incentives – Improved technologies
• Examples of emerging AD activities • Conclusions
UK Commitments and Targets (2020) Climate Change Act
• Greenhouse gas emissions 34% below 1990 levels
EU Renewable Energy Directive
• 15% of UK‟s energy from renewable sources
EU Landfill Directive
• Biodegradable municipal waste sent to landfill 35% of that produced in 1995
EU Waste Framework Directive (2008) Waste Hierarchy Prevention
Using less material in design and manufacture. Keeping products for longer; re-use.
Preparing for re-use
Checking, cleaning, repairing, refurbishing, whole items or spare parts.,
Turning waste into a new substance or product. Includes composting, if it meets quality protocols.
Including AD, incineration with energy recovery, gasification and pyrolysis which produce energy and materials from waste; some backfilling operations.
Landfill and incineration without energy recovery.
Recycling Other recovery Disposa l
Renewable Energy Strategy (UK) • Renewable Energy Strategy
– UK delivery plan – 15% renewable energy by 2020
Renewable Heat (12% by 2020) Renewable Power (30% by 2020) Renewable Transport Fuels (10% by 2020)
• Why and How can Anaerobic Digestion contribute?
Coalition Agreement • “We will establish a full system of feed-in tariffs in electricity – as well as the maintenance of banded Renewables Obligation Certificates” • “We will introduce measures to promote a huge increase in energy from waste through anaerobic digestion” • “We will create a green investment bank”
Overview • What is AD • Why do we need AD
– Drivers and UK Biogas Market
• How can we achieve AD in the UK? – Sources of biomass – Financial incentives – Improved technologies
• Examples of emerging AD activities • Conclusions
Resource Availability Energy crops are one possible feedstock: Simplified regulation Arable rotation - good break crop Grass – multiple cut, multiple use
…But they do require land which is a more limited resource in the UK.
Resource Availability Food Waste ≈ 16 Mt/y ≈ 8.3 Mt/y household ≈ 6.3 Mt/y commercial & industrial ≈ 1.3 Mt/y food service & supermarkets
Agricultural Waste ≈ 90 Mt/y ≈ 13 million cattle ≈ 33 million sheep ≈ 4 million pigs ≈ 166 million chickens
Sewage Sludge ≈ 1.73 Mt/yr
1 tonne food waste = 300kWhe Food waste potential = 5 TWhe
+
1 tonne slurry / manure = 50 – 100kWhe
Agricultural waste potential = 8 TWhe
+ 1 tonne sewage sludge = 125 - 150kWhe Sewage sludge potential = 1 TWhe
Renewables Obligation The Renewables Obligation (RO) for large-scale (generally >5MW) renewable electricity projects.
ROCs issued to accredited generators for renewable electricity. Introduced in April 2002 Banded from April 2009 Double ROCs for Anaerobic Digestion • ROC value c. £44 – 50 per MWh Banding Review due 2013 •
Consultation on the grandfathering policy of support [for AD] under the RO – Grandfathering of support at current levels for AD and EfW generators
Feed-In-Tariffs – Payment rates Technology
Scale
Tariff level for new installations (p/kWh) *
Tariff Lifetime (years)
Anaerobic Digestion
≤ 500 kW
11.5
20
Anaerobic Digestion
> 500 kW
9.0
20
PV
> 4 – 10 kW
36.1
25
PV
>10 – 100kW
31.4
25
PV
>100kW – 5MW
29.3
25
Wind
>15 – 100 kW
24.1
20
Wind
>100 – 500 kW
18.8
20
Wind
>500kW – 1.5MW
9.4
20
Wind
> 1.5 – 5MW
4.5 20(RPI linked) * NB Tariffs will be inflated annually
Fast-track review of small-scale AD [and PV] tariffs announced on 07 February 2011 < 250kWe = 14p/kWh 250 – 500kWe = 13p/kWe
Renewable Heat Incentive - Tariffs Technology Small Biomass Medium Biomass
Small ground source
Large ground source
Tariff (p/kWh)
< 200
Tier 1: 7.6 Tier 2: 1.9
200 – 1,000
Tier 1: 4.7 Tier 2: 1.9
≥ 1,000
2.6
Biomethane injection and biogas combustion (excl. landfill)
Injection all scales; combustion < 200
6.5
Ground-source heat pumps; water-source heat pumps; deep geothermal
< 100
4.3
Solid Biomass; Municipal Solid Waste (incl. CHP)
Large Biomass Biomethane
Size (kWth)
≥ 100
3.0
* NB Tariffs will be inflated annually (RPI linked)
Research and Development
MICROBIOLOGICAL SAFETY
Additional activities • • • • • • • • • • • • • • •
• • • • • •
Integration of on-farm biodiesel production with anaerobic digestion to maximise energy yield and greenhouse gas savings from process and farm residues Author(s): Heaven, S (Heaven, Sonia)1; Salter, AM (Salter, Andrew M.)1; Banks, CJ (Banks, Charles J.)1 Southampton University Fermentative biohydrogen production systems integration. Author(s): Guwy, A J; Dinsdale, R M; Kim, J R; Massanet-Nicolau, J; Premier, G Source: Bioresource technology Volume: 102 Issue: 18 Pages: 8534-42 Published: 2011Sep (Epub 2011 May 04) University of Glamorgan Energy implications of the thermal recovery of biodegradable municipal waste materials in the United Kingdom Author(s): Burnley, S (Burnley, Stephen)1; Phillips, R (Phillips, Rhiannon)2; Coleman, T (Coleman, Terry)3; Rampling, T (Rampling, Terence) Open University, Milton Keynes Life cycle assessment of biogas infrastructure options on a regional scale Author(s): Patterson, T (Patterson, Tim)1; Esteves, S (Esteves, Sandra)1; Dinsdale, R (Dinsdale, Richard)1; Guwy, A (Guwy, Alan)1 Univ. Glamorgan Financial appraisal of wet mesophilic AD technology as a renewable energy and waste management technology Author(s): Dolan, T (Dolan, T.)1; Cook, MB (Cook, M. B.)2; Angus, AJ (Angus, A. J.)1 Cranfield University
Overview • What is AD • Why do we need AD
– Drivers and UK Biogas Market
• How can we achieve AD in the UK? – Sources of biomass – Financial incentives – Improved technologies
• Examples of emerging AD activities • Conclusions
AD Development in the UK There are two categories of AD developing in the UK: Farm-fed systems
Waste-fed systems
-
-
-
Slurry Livestock Processing material generated on the farm only, i.e. Waste manure, crops and crop waste Manure Digestate can be spread on own land Scale is typically 100kW to 1MW grown Capital cost is typically £500kPurpose to £2.5 million Vegetative Annual income is typically £120k to £1.2 million Material Residual Capital grant is a possibility, subject to State Aid Planning is normally straightforward – can be passed without the need for full application Commercial Environmental permitting is straightforward – no need Food Waste Industrial for full permitting, not handling waste Waste-handling licences not required Household Environmental Impact Assessment not necessary Likely to generate heat & power through CHP Human Sewage Ideally forWaste local use Electricity grid connection may be necessary Heat may be wasted
-
Processing external waste; including domestic & commercial food waste, food processing waste and possibly farm materialsFARM Digestate spread on additional land off-site Scale is typically 1MW to 2.5MW Capital cost is typically £5 - 10 million Annual income is typically £2 - 4 million Capital grant is unlikely, unless for demonstration Planning is likely to be a long and challenging process Environmental permitting will be very stringent Waste-handling licences will be required WASTEwill be required Environment Impact Assessment May use biogas through CHP or direct gas grid injection Higher cost of gas upgrading technology Optimising use of outputs
Biogas Map ON-FARM 32 plants now
c.40 further plants planned or in construction
OFF-FARM 22 plants now c.20 further plants planned or in construction
How is Anaerobic Digestion being used in the Farming Sector? - Some Examples
Small-farm AD
125 – 150kW, typical dairy unit using slurry and maize or grass silage. 5-10ktpa, cost £300 - 800k
Source: BiogenGreenfinch
Medium-farm AD
500kW – 1MW, large farm or several farmers working together. Based on a dairy farm, possible supplementary feedstock coming from adjacent farms, i.e. maize or grass. Cost £1 – 2 million. 10-20ktpa
Source: BiogenGreenfinch
Centralised AD
2MW food waste plant – food waste recycler, also generating energy. 50,000tpa mixed waste. Cost £6 – 8 million.
How is Anaerobic Digestion being used in the Food Sector? - Some Examples
Adnams Brewery Location:
Southwold, Suffolk
Input:
12,500 tpa
Source:
Brewery waste generated on-site, local food waste
Equipment:
Three digesters, biogas upgrade
Biogas Use:
Biomethane Injection (60%), Vehicle Fuel
Digestate Use:
Local agricultural land used to grow barley for brewery
Commissioned:
2010
Capex:
£2.75 million (supported by ERDF, EEDA, DECC)
Benefits:
Issues:
- Community cost benefits (5% pa.)
- Securing local food waste
- Saving 50,000t CO2e from landfill
- Delay of RHI
- Carbon footprint reduced 50% over 5yrs
Guy & Wright (Green Tye) Location:
Bishop Stortford, Hertfordshire
Input:
10,000 tpa
Source:
Tomato waste on-site and wholesale market rejects
Enquipmet:
Macerator, underground digesters, CHP
Biogas Use:
500 kWe CHP (on-site and power export)
Digestate Use:
Own use or locally
Commissioned:
2009
Benefits: - Heat in greenhouses to allow year round production and reduce cost of fossil fuel - CO2 used in greenhouses for faster ripening and increased yields (60 – 300t/acre) - Reduced waste to landfill
GWE Biogas Location:
Driffield, East Yorkshire
Input:
50,000 tpa
Source:
Local authorities, food manufacture, supermarkets
Equipment:
De-packaging, heat recovery, water recovery, advanced digestate processing.
Biogas Use:
2MWe CHP (85% exported)
Digestate Use:
On-site and via local farmers; separated
Commissioned:
October 2010
Capex:
£9.5 million (supported by ETF, WRAP and CO2Sense)
Benefits:
Issues:
- 15 local jobs created
- Securing waste pre-operation
- Green power to 3,200 homes - Consistency of feedstock - 260,000tCO2 saving in 10 years
- Gate fees & haulage costs
Timeline for AD Development in the UK Feb 2009 „Shared Goals‟ document
2009 Feb 2010 RHI Consultation published by DECC
2010
March 2009 AD Task Group convened
July 2009 AD Task Group report April 2010 FIT‟s introduced
March 2010 Implementation Plan (Defra)
Jan – Mar 2011 AD Strategy process
2011
Sept 2009 Official AD Portal launched
April 2009 RO Banding
July 2010 Ministerial Roundtable
May 2010 Coalition Agreement March 2011 RHI details published
Feb 2011 FIT Emergency Review
Dec 2009 Biomethane Guide for Producers
32 PLANTS
Dec 2010 Launch AD Framework
Oct 2010 CSR
c.50 PLANTS
June 2011 RHI - Phase 1 implemented May 2011 AD Strategy published
c.100 PLANTS
Overview • What is AD • Why do we need AD
– Drivers and UK Biogas Market
• How can we achieve AD in the UK? – Sources of biomass – Financial incentives – Improved technologies
• Examples of emerging AD activities • Conclusions
Small-scale technology options
Availability of finance
Waste segregation
Perceived technology issues
Biogas Upgrading
Cost of energy crops
Biomethane for Transport
Security of incentives
Biomethane yields
Reliability of ROCs
Technical
Economic
BARRIERS TO UPTAKE Social Food waste collections Markets for digestate Skills & training Food vs. Fuel conflict NIMBI
Regulatory Planning Permitting Health & Safety Gas Quality Standards
Conclusion • The UK has come a long way in just a few years,
• But, barriers to development remain in place. • To see a “huge increase” in AD we need; Long-term security - Policy - Incentives - Feedstock supply
Confidence
Investment Strategy & planning Regulatory framework
Official AD Information Portal:
www.biogas-info.co.uk
Waste Policy Review Defra, June 2011:
•
“Food waste is an example of where prevention and recycling / recovery go hand in hand. We need to cut down the estimated 16 million tonnes produced every year in Britain, while ensuring that more is not simply disposed of in landfill”.
•
“…Government supports efficient energy recovery from residual waste which can deliver environmental benefits, reduce carbon impacts and provide economic opportunities.
•
“Our aim is to get the most energy out of genuinely residual waste, not to get the most waste into energy recovery.”
AD Strategy & Action Plan Defra / DECC, June 2011: •
“ Around 16Mt of food and drink waste arise annually in the UK…half from households and half from manufacture, retail, hospitality & business”
•
“The production, distribution and disposal of avoidable household waste generates 20MtCO2e (3% of total UK GHG emissions) and uses 6% of UKs water footprint”
•
“Based on likely waste resources (c.5Mt)…this would replace 47,500t of nitrogen (N), 14,720t of diphosphorous pentoxide (P2O5) and 20,400t of potassium oxide (K2O) – saving 386,000tCO2e
•
“Based on likely waste resources AD could deliver between 3–5 Terawatt hours (TWh) of electricity by 2020.”