planning and implementation of a cavern sewage treatment … · 2016-09-14 · hsy water services...
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21.6.2013
HSY Water Services
Planning and implementation of a cavern sewage treatment
works in Finland
Tommi Fred
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100 Years Wastewater Treatment in the Helsinki Metropolitan Area
• Alppila plant 1910–1959
‒ Rock filter and septic tank
• Savila plant 1915–1931
‒ Rock filter and septic tank
• Kyläsaari 1932–1994
‒ The first activated sludge plant in the Nordic countries
• Rajasaari 1936–1978
‒ Activated sludge plant
• Tali 1957–1986
• Herttoniemi 1959–1985
• Kulosaari 1960–1975
• Lauttasaari 1962–1992
• Viikki 1965–1994
• Laajasalo 1966–1988
• Munkkisaari 1967–1991
• Vuosaari 1971–1994
• Viikinmäki 1994–
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1980’sDecade of demands and discussions• Pressure to increase treatment efficiency
1970-1980
• Old treatment plant’s efficiency was not adequate
‒ Expansion need or
‒ Centralised treatment plant
• Number of inhabitants increases at the same time
• Demands for centralised wastewater treatment for Central-Uusimaa district as well
• Pressure to control indirect environmental impacts as well
‒ Odours, noise and traffic/logistic
• Employee safety issues and weather impacts came in to the discussion
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Helsinki underground planning schema
• Underground plan was updated in the begin of 1980’s
• First area was reserved for centralised treatment plant
• Underground area below Sörnäinen prison area in city centre
‒ Treatment plant would be 60 m under wd• Long logistic tunnel systems• Water treatment lines under sea level
‒ Expensive‒ No reserve for future expansions
• Viikinmäki
‒ Treatment plant would locate optimally for the existing tunnel system
‒ Water treatment area totally above sea level
‒ Area is enough wide and there is reserve for future as well
‒ Above ground buildings won’t cause disturbance to the residential areas
• Other options were also presented
Realistic option turned out to be Viikinmäki
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Political decisions for Viikinmäki Project
• Project planning 1985-1986
• Helsinki City council accepted plans to build centralised treatment plant in May 21st 1986
• Financial share of Helsinki 457 Mmk (80 MEur)
• Vantaa and central Uusimaa totally 97 Mmk (17 MEur)
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Time for planning 1985-1988
• 1985 Preliminary design by Helsinki Geodeticall Department
• 1986 Terraplan Ltd detailed geodetical design
• 1986 Suunnittelukeskus Ltd ja Soil&Water Ltd shared general planning phase
• 1987 City Council accepted the general plan
• Excursions especially to Stockholm where is two underground treatment plants
‒ Operation manager of the Stockholm Water was part of the design team of Viikinmäki
• 1987-1988 Detailed design
‒ Wastewater treatment process Suunnittelukeskus Ltd.
‒ Sludge treatment and gas handling Soil&Water Ltd.
‒ Rock Engineering; Saanio & Riekkola, Kalliosuunnittelu Ltd. ja Suunnittelukeskus Ltd.
‒ Structure mechanical engineering Pöysälä & Sandberg
‒ Construction design of buildings MV-Konsultit/Soil&Water Ltd.
‒ HVAC Olof Granlund Ky
‒ Electrical and automation design Ekono Ltd.
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Courtesy: City of Helsinki
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21.6.2013HSY Water Services 9ITA-AITES World Tunnel Congress 2009 OPEN SESSION9Courtesy: City of Helsinki
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21.6.2013HSY Water Services 10ITA-AITES World Tunnel Congress 2009 OPEN SESSION
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Courtesy: City of Helsinki
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Time for construction 1988-1994 - Excavation period
• 1988 constructions started by the excavations of driving tunnels and process areas
‒ Excavation contract Lemminkäinen Ltd
‒ Crushing contract Teräsbetoni Ltd
• Excavation was divided into 6 phases
• Excavated rock 950 000 m3
• Tolerances ± 15-30 cm
• Excavated rock was crushed on site and sold out
‒ Crushed stone more than 2 000 000 t
‒ 50% Helsinki city purposes
‒ 50% was sold out to open market
• Lemminkäinen utilised new wet spraying method at Viikinmäki site
‒ Automated process
‒ Steel net as a reinforcement (25 mm)
‒ Spraying area more than 110 000 m2
‒ Bolting more than 73 km (20 000 pcs)
• Water treatment line excavations were ready 1990
• Rest of the excavations were ready in the begin of 1992
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Time for constructions 1988-1994 - Construction period
• Water treatment line construction started 1990
‒ Contractor Teräsbetoni Ltd.
• Sludge treatment was taken under construction in 1992
‒ Contractor Teräsbetoni Ltd.
• Totally 1 100 000 m3 space in 15 hectare area
• Treatment volume higher than 300 000 m3
• Main part of the construction projects were ready in 1993
• Buildings above the ground was contracted by Puolimatka Ltd
‒ Operation room, offices, catering, storages, social areas for employees and power plant
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Time for construction 1988-1994 - Machinery and automation
• Installation of machinery equipments started in 1991
• Main installation wave during 1992
• Contractors: Atmostech Oy, Valmet Oy (Metso), HV-Turbo Oy, YIT-Yhtymä Oy
• Last equipments were accepted in operation 1995
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Start-up period
• Two wastewater treatment lines and two digestors were in operation start-up phase in April 1994
• Plant was taken operation in 3.5.1994
• Sludge treatment was taken in operation in July 1994
• Final tunnel systems from city centre and east was ready in August 1994
• During September 1994 plant reached the full capacity
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Structure of Viikinmäki in 1994
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Expansion phase 2000-2003
• Total nitrogen removal demand increased to 70 %
• Original activated sludge process was not efficient enough for high nitrogen removal
• Biological denitrifying filters and 1+1 extra activated sludge treatment lines were build during the project
• Excavated volume 190 000 m3
• Expansion was ready in the end of 2003
• Actual reduction of nitrogen is 90 %
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Structure of Viikinmäki in 2004
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Environmental impacts – Phosphorus
0
50
100
150
200
250
300
350
400
4501
97
4
19
76
19
78
19
80
19
82
19
84
19
86
19
88
19
90
19
92
19
94
19
96
19
98
20
00
20
02
20
04
20
06
20
08
20
10
(t/a
)
Chemical
phosphorus
removal
Viikinmäki
WWTP Biological
post-denitrification
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Environmental impacts - Nitrogen
0
500
1000
1500
2000
2500
3000
3500
19
74
19
76
19
78
19
80
19
82
19
84
19
86
19
88
19
90
19
92
19
94
19
96
19
98
20
00
20
02
20
04
20
06
20
08
20
10
(t/a
)
DN-process
Biological
post-
denitrification
Viikinmäki
WWTP
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Kakolanmäki WWTP
• City of Turku and surrounding municipalities connected
• Locates middle of City Centre
• Operation since 2008
• 400 000 PE
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Kakolanmäki WWTP
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Sulkavuori WWTP
• Underground plant for Tampere and it surroundings
• 350 000 PE
• Environmental impact assessment completed
• In operation 2020
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Blominmäki WWTP
• Wastewater treatment for City of Espoo and west side Vantaa
• PE 400 000
• Investment cost estimate 280 million euros, including influent and effluent tunnels
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Viikinmäki Extension 2030 –preliminary design
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Summary
• The biggest cities in Finland are already having cavern wastewater treatment plant or plant is under design
• Environmental impacts have been very small even though plants are located in middle of residential areas
• Cavern treatment plants have proven to safe and reliable solution to large wastewater treatment plants
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HSY Water Services
Thank you!