2. 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
www.methanogen.co.uk
info@methanogen.co.uk
3. Engineering Development of UK Farm-AD
1976 – Energy Show, Earls Court
www.methanogen.co.uk
info@methanogen.co.uk
Mr Evans - 1978
4. 4
70m³ FGB on show-1981
www.methanogen.co.uk
info@methanogen.co.uk
5. Burford House Food Waste Trials
Equipment supplied by Methanogen
1996-1998 Restaurant Waste 1998-2001 Kitchen Waste
2001-2003 Pathogen Research
www.methanogen.co.uk
info@methanogen.co.uk
6. 6
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
www.methanogen.co.uk
info@methanogen.co.uk
7. 7
Digester Design Concepts
www.methanogen.co.uk
info@methanogen.co.uk
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
8. 8
Self Build
Build Tank
Mixing pipes
Install roof
Connect control kiosk
Commission
www.methanogen.co.uk
info@methanogen.co.uk
10. w
w
w.
m
et
ha
no
ge
n.
co
.u
k10
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
11. 11
36 Port Gas Mixing
Rotary Valve
Gas Mixing
Technology
Development
12. 12
www.methanogen.co.uk
info@methanogen.co.uk
• 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
