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Bio methane production in Växjö
Content
• History
• Present situation
• Future
Bio-methane history
Old sewage
plant
1 digester / gas-
boiler
1994 - Sundet
2 digesters / gas-
boiler, gas-engine
2003 Agropti-gas
closed
Co-digestion of
biowaste, manure
and grass crop
2006 New reception
lines
Liquid organic waste
2007 New gas
upgrading and filling
station (SESAC-
project)
2008 New gas-engine2008 Decision source
separation in
households of
biowaste
Totalt mottogs 14 839 m3 externslam under 2007 vilket motsvarar ungefär 21,5% av totala slammängden som
pumpats in i rötkammaren (resten är Sundets interna slam)
Present situation
Feedstock for digestion 2011
Internal sludges sewage water treatment 65 000 ton
Sludge small sewage treatment plants 3 000 ton
Sludge septic tanks 11 000 ton
Sludge grease traps 900 ton
Food waste 300 ton
Food waste collection system, waste disposer –
tank store
...transport to sewage plant for co-digestion with sewage
sludge
The result – bio methane for vehicle
fuel and .el and heat production
Present situation
Food waste large scale kitchen
The present system
Energy utilization from crude gas
6%
1%
84%
9%
Flare
Burner
Engines
Fuel-prod
Internal goal 60% el selfsuffiency
El selfsufficiency
0%10%20%30%40%50%60%70%
Janu
ary 2
008
Febru
ary
Mar
chA
pril
May
June
July
Aug
ust
Sep
tem
ber
Oct
ober
Nove
mbe
rD
ecem
ber
Sustainable waste handling
Future bio-methane production
Today household waste
to incineration plant in Ljungby for el and
heat production
Reloading at landfill area and transport
250 kg/inhabitant 18 % package products
48 % food waste
0,2 % env dangerous waste
Present situation
National goals waste handling
• Waste to deposit shall decrease at least 50% from 1994 to 2005
• 2010 shall at least 50 % all waste from household be used for material
recovery included biological treatment.
• 2010 shall at least 35% of the foodwaste from households, restaurants and
institutional kitchens be treated by biological methods for recovery
• 2015 shall 60% of the content of phoforus in the sewer system be recycled
for agricultural purposes
General: The total amount of waste shall decrease
Collection system
· Paper bag system
· Separate 140 lit dust bin with
ventilation,
Pre treatment plant
Increased digestion capacity
New Gas-Cleaning
The CApureTM process tecn.
Biogas pipeline Sundet - Hammerdalsgatan
• 4 300 m
• Dy 125 mm
• Pressure <4 bar
Slow fuel filling for buses
Future bio methane production
• Existing crude gas production
Sundet 720 000 Nm3 vehicle
fuel
• Future crude gas production
with foodwaste 1 300 000 Nm3
vehicle fuel
El (MWh) Värme (MWh) Fordonsbränsle(MWh)
Totalenergi (MWh)
Changed production
- 2 410 - 3 550 + 12 500 + 6 540
Changed consumphtion
+ 1 120 + 510 - 40 + 1 590
Changed energy balance
- 3 530 - 4060 + 12 540 + 4950
Ton CO2/år Ton CO2/år Ton CO2/år Summa ton CO2/år
Changed CO2
emission+ 113 Ingen - 3 360 - 3247
Effects - energy utilization and green house gases
•Lower exhaust emissions from bio methane compared to diesel
•Renewable fuelled buses is a good argument to choice bus
•Less fuel prize fluctuation
•The city obtains the national environmental goals
•Better material recovery of other materials (experience from other municipalities)
•Recycling of nutrients
Other advantages with source separation of biological waste and bio methane fuel production for buses
Energy supply to Växjö 2010
13%
14%
1%
9%
2%
38%
10%
7%
1%
1%
1%
3%
Total 2711 GWhGasoline
Diesel
Aviation fuel
Oil
Peat
Wood fuels
Renewable imported electricity
Non-renewable importedelectricityLocal windpower
Local hydropower
Biogas
Solar energy
Ethanol
FAME
Heatpumps
Straw
LPG
Ecopar