Case study: the Blominmäki WWTP and RAVITA innovation - Mari Heinonen Director of the wastewater services division Helsinki Region Environmental ...
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Case study: the Blominmäki WWTP and RAVITA innovation Mari Heinonen Director of the wastewater services division Helsinki Region Environmental Services
Helsinki Region Environmental Services Authority Water services
Helsinki Region Environmental
Services Authority HSY Waste
management
services
High-quality Environmental
drinking water regional
for over a information
million
inhabitants
Effective
wastewater
treatment for
1,4 MPE
Energy from biogas
Eco-compost from sludge
Heat from wastewater
Purely better, every day
Mäntsälä
Metropolitan area sewer system
Pornainen
1. Suomenoja wastewater
Sewer tunnel Järvenpää treatment plant 1962-2022
Pressure sewer
2. Viikinmäki wastewater
Large pumping station treatment plant 1994-…
Area with combined sewer system Tuusula 3. Blominmäki wastewater
Sewer district boundary Kerava treatment plant and tunnels
(under construction) 2022-
Outfall tunnel …
Sipoo 4. Metsäpirtti composting field
Vantaa
for sludge
4
Espoo
Helsinki
Kauniainen 2
Facts:
3
Siuntio
Kirkkonummi
1
Municipal wastewater treatment since
1910, AS process + biogas since 1932
2019: Two wastewater treatment plants
New Blominmäki WWTP 2022
Combined sewer system in the centre
of Helsinki, separate sewers elsewhere
Case story: New Blominmäki WWTP
5
Why Do We Need Increased
Wastewater Treatment Performance and Capacity?
• Population growth
‒ Plant load values for 2040 = 1,5 x current load
• Increasingly strict treatment requirements by the authorities
‒ Environmental permissions have become tighter
‒ Design targets for effluent water: Phosphorus 0,2 mg/l , nitrogen
reduction > 90 % , UV hygienization and bypass water treatment
‒ Prepared plans for other requirements (e.g. removal of micro
pollutants)
• Protection targets of the Baltic Sea
‒ Loads from large point sources (e.g. WWTP) must be controlled and
limited, even though the majority of load is coming from diffuse
pollution
• Increasing nutrient (nitrogen) levels in influent wastewater
‒ Increased consumption of protein e.g. meat and dairy products
• Climate change adaption
‒ More runoffs to sewers, preparing for floods
6
Location options and selected position
7
Blominmäki
wastewater Effluent tunnel shaft
treatment
plant
Inlet tunnel from
Mikkelänkallio northern main sewer
access tunnel
Söderskog inlet tunnel
Overflow route from sewer to
effluent tunnel
Malminmäki
access tunnel
Friisilä access
tunnel
Inlet tunnel from southern
Sewer tunnel main sewer
Finnoo access
Effluent tunnel tunnel
Existing Suomenoja
effluent tunnel
Access tunnel for vehicles Suomenoja inverted siphons , Suomenoja effluent tunnel, leads to
Western Metro buildings of current WWTP outer archipelago of Espoo
Treatment Requirements and Targets
HSY’s Blominmäki HELCOM Existing
Treatment WWTP Recommen- Suomenoja
Objective for Permit dation WWTP
Blominmäki Values Permit
Values
Phosphorus (Ptot) < 0.2 mg/l < 0.25 mg/l < 0.5 mg/l < 0.35 mg/l
Phosphorus
removal efficiency > 96% > 96% > 90% > 95%
Nitrogen (Ntot) < 5 mg/l - < 10 mg/l -
Nitrogen removal
efficiency > 90% > 80% > 70–80% > 70%
Biochemical
oxygen demand
(BOD7) < 8 mg/l < 10 mg/l < 15 mg/l < 10 mg/l
BOD7 removal
efficiency > 96% > 95% > 90% > 95%
9
Blominmäki WWTP
2040: 150 000 m3/d
550 000 PE
Option
UV
OR THERMAL PROCESSING
10Blominmäki wastewater treatment plant 150 000 m3/d
400 000 PE v. 2020 ➔ 550 000 PE v. 2040
1. Influent tank
2. Fine screen
3. Sand removal
4. Primary sedimentation
5. Aeration tanks
6. Secondary sedimentation tanks
7. Biological filters
8. Sludge thickening
9. Digestion reactors
10. Emergency exits
11. Reject water treatment
12. Exhaust pump
13. Administrative building
14. Storage/workshop
15. Sludge and biogas building
16. Sludge storage silos
17. Disc filters, approx. 20 µm
18. Gas storage tanks
19. Vehicle tunnels
20. Inlet and discharge sewer tunnelsEnergy efficiency in Blominmäki WWTP
Biogas production c a.5,5 Mm3/year (65 % CH 4).
Biogas will be used in own power production like we do in Viikinmäki WWTP
– 70 % electrical energy self-sufficiency in start up (Viikinmäki WWTP 95-
100 %)
• Gas engines (2 x 1,6 MW)
– Heat recovery from the electrical energy production
• ORC-process (170 kW)
– Utilizes the waste heat of gas engines’ exhaust gas and transfer it to
electrical energy
• Water turbines (25 kW), in effluent water
• Solar Panels (400 kW), Panel fields on roofs and in the field
• All equipment are energy efficient and used will be optimized
– 100 % self-sufficiency in heat production:
• Several heat recovery points, 5400 m 3 energy storage and heat pump.Cost Budget Cost Budjet
M€
Plant Excavations 86
Influent and Effluent Tunnel
Excavations 61
Influent arragements from
Suomenoja 10
Construction 79
Machinery 54
HVAC 11
Instrumentation and
Automation 7
Electrical Work 15
EIB and NIB loans are the main instruments Design and Constuction
for the economy of the investment Management 16
management Reservations for Increase
of Excavation Costs 15
Reservations for Other
Unpredicted Costs 17
Total 371 13Design period 2009-2017 (2018-2021)
14Aerial View (Planning Phase)
Helsinki – Turku Motorway E18 E18 Helsinki – Turku Motorway
15Underground Lay-Out
Screening Grit removal Pre-sedimentation Aeration (Compressors) Secondary Sedimentation DN-filters
Reservation for
exhaust air treatment
Reservation for
Incoming chemicals micropollutant removal
Dried sludge
Digesters Thickening Discfiters UV hygienization
163D design of Blominmäki
17 17Ground Lay-Out
Construction period
19Excavation period 2015-2018 • One construction contract with former Lemminkäinen Ltd. • Excavated volume ca. 1 000 000 m3 • Excavated rock has been and will be utilized as blast stones and raw material for gravel and sand
E
x
c
a Raising excavation
v
a
t
i Container for underground
o safety purposes Deepening excavation
of the digester
nConstruction period 2018-2022
• One main construction contract for
YIT Ltd.
• Project management contract
agreement with target budget
• Construction area ca. 100 000 m 2
equal to 14 football fields
• Examples of construction materials:
• 85 000 m3 concrete
• 7,5 Mkg of reinforcement iron
• more than 40 km stainless steel
pipesE C
x h
h i
a m
u n
s e
t y
A
i
• 100 m high
r
• Slip casting methodD i g e s t e r s
Construction site at present
RAVITA Innovation for recovering phosphorus
Phosphorus • According to different sources virgin phosphorus deposits will last for 40-100 years • Most countries depend on imported P • In Middle-Europe few WWTPs have demands to recover P – Germany – Switzerland – Austria • Recovery potential meets only large WWTP • Cost of the recovered P is not competitive
Phosphoric
Effluent acid recirculation
wastewater
End product 1
Acid
Recovery of SURPLUS
Post-
precipitations Chemical sludge
Dissolution Metal phosphate Phoshorus
Phosphoric acid PHOSPHORIC
step solution
and separation Separation ACID
step
Treated Precipitation chemical
wastewater
Precipitation chemical
recirculation
WWTP BIOSLUDGE
Phosphorus recovery from water phaseHeavy metals in RAVITA-sludge
70
4,500
60
4,000
mg /kg Phosphorus
50 3,500
mg /kg Phosphorus
3,000
40
2,500
30 2,000
20
1,500 ■ RAVITA sludge
1,000 ■ Viikinmäki WWTP sludge
10 500 ■ Legislative limit
0 0
Cd Hg As Pb Ni
Heavy metal Heavy metal
70,000
60,000
mg /kg Phosphorus
50,000
40,000
30,000
20,000
10,000
0
Cr Cu Zn
Heavy metalTECHNICAL steps
• RAVITA DEMO plant
– Increase of TRL (now 5 - 6)
– Dissolution and separation of RAVITA
sludge into the DEMO scale
• Energy and mass balances
• More analyses of the end product quality
– Hazardous substances and
microplastics
BUSINESS steps
• Ecosystem mining for potential partners
(out of the box) and clients
• End users ideas and comments needed to
complete the business concept
RAVITA Future stepsPuhtaasti parempaa arkea | En rent bättre vardag | Purely better, every day
Thank You!
Helsingin seudun ympäristöpalvelut -kuntayhtymä
Samkommunen Helsingforsregionens miljötjänster
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