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On Farm AD UK Gas Mixing & De-gritting Technology
On Farm AD
UK Gas Mixing &
De-gritting Technology
History 1974-1989
In 1974, I built a small 1m3 digester to run on cattle muck
In 1975, Michael Chesshire joined me and formed farmgas Ltd, building an experimental 7m3
digester, running on pig slurry
1977-89, farmgas Ltd was building an average of one farm digester/year, as well as an even larger number of sewage works digesters
Smallest installation was 30m3 on a pig farm
Numerous awards, including abattoir & monastery digesters
During the height of the ’90’s, were building one farm-scale AD plant per month, as Waste Refineries International
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Engineering Development of UK Farm-AD
1976 – Energy Show, Earls Court
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Mr Evans - 1978
Burford House Food Waste TrialsEquipment supplied by Methanogen
1996-1998 Restaurant Waste 1998-2001 Kitchen Waste
2001-2003 Pathogen Researchwww.methanogen.co.uk
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Digesters: The Agri-technology
Before: What happens if we do
nothing
After: This 20 year old digester has saved its owner
thousands in displaced fossil fuel fertilisers & house
heating costs, as well as reducing smells, emissions
and pollution
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Digester Design Concepts
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Our digester designs have a combined operating time in the UK of more than
450 years, with many having run for 20 years and more on a wide variety of
feedstocks.
They feature simple installation, low parasitic load and easy, user-friendly operation
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Self Build
Build TankMixing pipes Install roof
Connect control kioskCommission
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Successful Small Scale AD: Digester must be integrated into farming
practice
Freshest feedstock (slurries/manures)
Feedstock hygiene
Simple to operate
Don’t be greedy – no overfeeding!
Avoid digester ‘spiral of death’
Pumps/macerators
1136 Port Gas Mixing
Rotary Valve
Gas Mixing
Technology
Development
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• This digester design with a patented
automatic de-gritting system is available in
all sizes, large and small.
• Never stop the digester to empty it again
• Feed gritty feedstocks such as slurry from
cows bedded on sand/ash or unwashed
sugar beet
• Highly efficient mixing system uses less
than 1W/m3 to mix the feedstock.
• Long-lived insulated structural GRP
roof, proven over 30 years
The Latest Technology-
No Grit Problem
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Degritting at different scales
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Reducing Capital Cost
Marches Biogas
Agridigestore
Methanogen roof design
Methanogen elevated belt press separator
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Driving AD Technology Forward
CNG powered
Volvo. Methanogen
gas scrubbing &
compression
system
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17 Community Food Waste Growing Trials
James Murcott
Methanogen (UK) Ltd
www.methanogen.co.uk
M: 07980 541520Twitter: BiogasUK
Blog: anaerobicdigest.tumblr.com
