Transcript Labo op een rioolwaterzuiveringinstallatie

Welcome European visitors !
Februari 7, 2013, Site Houthalen Centrum
What are we going to do today?
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Who is Aquafin ?
Energy management
Wastewater treatment plant (WWTP)
Thermal Sludge dryer
Field trip on site
Wastewater treatment in Flanders
Who is Aquafin ?
• 1990 : Established by the Flemish government
• 1995 : exploitation of the infrastructure
• 2004 : owner of all WWTP
• 265 WWTP
• 1315 pumping stations
• 5096 km sewer pipeline
• 1000 employees
• 2.000.000.000 liters/day
Energy management
Energy consumption in Flanders
0,7% of the industrial energyconsumption in Flanders
Energy consumption Aquafin
Budget : 112 million EUR
Operations (2010)
chemicals
4%
taxes
other
3%
6%
personel
23%
sludge
28%
energy
25%
maintenance
11%
“Trias Energetica” concept
Energy report,
Energy audit,
Aeration energy
Method
- Monitoring
- Simple performance indicator : kWh/IENkJ
- Compare model with reality
 Awareness !!!
Influentload
Aeration power
Volumes
Model
Pumping power
Head (pumps)
Mixing power
Efficiency
Energy audit WWTP
- TOP 5 : audit by means of a multidisciplinairy team
OPERA
EnergyManagement
O&PO
OD
TOO
Via voettekst kan je hier je titel toevoegen © Aquafin NV 2005
11
Resultaat 2010 - 2011
- Besparing na uitvoering alle energieprojecten :
2010
2011
7 miljoen kWhe
7,5 miljoen kWhe
746.500 EUR/jaar
755.000 EUR/jaar
“Trias Energetica” concept
Sludge digestion
Codigestion
Heatpumps
Sludge digestion
Evolutie meerdere jaren
10,000,000
9,000,000
8,000,000
7,000,000
+40%
6,000,000
5,000,000
4,000,000
3,000,000
2,000,000
1,000,000
0
2005
2006
2007
2008
2009
2010
2011
2012
Resultaat 2012
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Besparing door opwekking groene stroom
9.500.000 kWhe  1.805.000 EUR (+14,5%)
In 2010: 1 RWZI > 1 miljoen kWhe
In 2011: 2 RWZI’s> 1 miljoen kWhe
In 2012: 5 RWZI’s > 1miljoen kWhe
“Trias Energetica” concept
Efficient processes ( Annamox, A/B Verfahren)
Efficiënt equipment (bv. screwblowers)
Efficient dewatering (bv bucher)
Efficient tools
Incorporate Energy in everything we do :
- ‘Knowledge’ projects (multidisciplinair !)
- Propellors, mixers, et al.
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Purchasing pumps, compressors : Energy as important
parameter
- Total Cost of Ownership !!!!
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Experiments in tendering vb. Leuven, Burcht
- Aim : use the knowledge of providers to think along with us. To provide us
with a solution
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Researchprojects
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Heatpumps
Glycerol dosing
Screwcompressor
Bucher press
Total Cost of Ownership
Conclusion
-
Think Energy !
How do we do it ?
• Wastewater cycle and sludge cycle
• Sludge treatment
How do we do it ?
• Wastewater cycle and sludge cycle
Stap 1: Mechanical treatment
Stap 2: Biological treatment
Stap 3: Final treatment (separation by sedimentation)
How do we do it ?
• Sludge treatment
-Anaerobe sludge digestion
-(sludge reduction, methane production)
- Sludge dewatering (up to 35 %DS)
- (thickener , thickening table, filter beltpress, chamber filterpress, centrifuge)
- Drying (thermal sludge dryer) (up to 90 %DS)
- (Energy production by burning as fuel, major reduction of sludge mass)
Thermal Sludge Dryer
Why should we dry sludge ?
Digested and active dewatered sludge
•To reduce sludge volume
Dryer
•A consisted and manageable product
•To reduce transportation cost
•Energy value by burning as lower fuel
Capacity = 10.000 tons/year at 90 %DS (3,7 m3/h
•water
evaporation)
•Or
150 m3/d dewatered sludge transformed into 30
•ton
of pellets
Sludge drying
•The dryer is for 50 % filled up with pellets
•Air fans are started and create an air flow
throughout the pellets (max. airflow = 24.000 m3/h)
Dryer
The air flow is used to absorb dust and moister
•coming
out of dewatered sludge, it also forms the
pellets
•Air flow is inert to prevent explosion
Inert gasses are mainly produced during the
•process
(extra nitrogen injection during start up or
when necessary)
Air Fan
Heating up the dryer
Steam
Water
•Steam is used to heat up the dryer
•The steam is produced by a neighbor factory
Condensed water (100 °C) coming out of the heat
•exchanger
is returned to the steam producer
Dryer
•Under-pressure on top of dryer
•Top temperature is regulated at
85°C mainly by controlling the
sludge flow
Heat
Exchanger
Inside dryer
temperature = 200 °C
•Steam
•Steam pressure = 12 bar
•Water temperature = 100 °C
The condenser
Steam
15 °C
Effluent
Water
Condenser
Cyclone
Dust
Separator
60 °C
Drip
Collector
85 °C
Dryer
WWTP
60 °C
89 m³/day
Heat
Exchanger
Inside dryer
60 °C
closed inert air circulation
•Fully
dust (drying process)
•Remove
water out of sludge
•Remove
•Condensation by sprinkling
Feeding sludge
Steam
Water
Dryer
DS = 60 %
Heat
Exchanger
Inside dryer
SludgeDaily based
buffering
Sludge
Bunker
(500 m3)
flow at 150 m3/d
•Sludge
•DS = 25 - 30 %
Removing the pellets
Steam
Water
Pellet
Silo
180 tons
Dryer
40 °C
Pellet
Cooler
85 °C
Heat
Exchanger
Inside dryer
at 90 % DS
•Pellets
30 tons of pellets
•Daily
•Silo is kept inert to prevent
explosion
WWTP
40 °C
SLUGE DRYER
Steam
15 °C
Effluent
Water
Pellet
Silo
Condenser
180 tons
Cyclone
Dust
Separator
60 °C
Drip
Collector
85 °C
Dryer
WWTP
60 °C
40 °C
DS = 60 %
Pellet
Cooler
Heat
Exchanger
Inside dryer
Air Fan
WWTP
40 °C
89 m³/day
Sludge
Bunker
(500 m3)
85 °C
60 °C
SludgeDaily based
buffering