an environmental investment for the future

AN ENVIRONMENTAL INVESTMENT FOR THE FUTURE AN ENVIRONMENTAL
INVESTMENT FOR THE FUTURE 1
2 AN ENVIRONMENTAL INVESTMENT FOR THE FUTURE
AN ENVIRONMENTAL
INVESTMENT FOR THE FUTURE
Stockholm is one of Europe’s fastest growing cities. Every year,
there are 20,000 more of us who shower, brush our teeth, use
the toilet, wash up and everything else that creates wastewater
that needs to be treated.
In a fast-growing city, we have to be careful with our water. In order to successfully manage
Stockholm’s rapid population growth, the city needs to renew its water treatment system.
Stockholm’s municipal council decided in the spring of 2014 to double the capacity of
the Henriksdal’s Wastewater Treatment Plant (WWTP), which was developed into one of the
world’s most modern such plants. The Bromma Wastewater Treatment Plant is to be closed
and a new tunnel conveying all wastewater will be built 30–90 metres underground from the
Bromma plant to the Sickla facility, a part of the Henriksdal WWTP. The tunnel construction
is planned to begin once Stockholm Vatten has obtained a new environmental permit, currently under review from authorities.
This initiative will result in a much cleaner water in Lake Mälaren, reduced discharge into
the Baltic Sea and transportation of digested sludge through residential areas will be eliminated.
Further information on the project for Stockholm’s waste treatment is available at:
www.stockholmvatten.se/sfa
You can pre-order our digital newsletter for the project by emailing:
framtidensavloppsrening@stockholmvatten.se
A BIG CITY WITH SUSTAINABLE GROWTH
Stockholm is known for its beauty and closeness to the water. Thanks to targeted and focused
efforts over the years, it is still possible to both go fishing and swimming right in the centre of
the city.
The long-term work on urban environmental issues meant that Stockholm won the contest
2010 as Europe’s first environmental capital city.
The investment that Stockholm Vatten has now introduced means even more effective
treatment of the city’s waste water and is a part of Stockholm’s long-term vision to be a big
city with sustainable growth.
AN ENVIRONMENTAL INVESTMENT FOR THE FUTURE 3
4 AN ENVIRONMENTAL INVESTMENT FOR THE FUTURE
Ul v s u n d as j ön
ÅKESHOV
A
Bromma Waste
Water Treatment Plant
NOCKEBY
HÖGLANDET
STORA ESSINGEN
B
SMEDSLÄTTEN
E4/E20
LILJEHOLMEN
GRÖNDAL
Mälaren
EOLSHÄLL
HÄGERSTEN
C
D
ASPUDDEN
MIDSOMMARKRANSEN
Sö
r
de
tä
lj
ä
ev
FROM BROMMA TO
HENRIKSDAL
30–90 METRES
UNDERGROUND
The planned tunnel will reach from the Bromma Wastewater Treatment Plant to the Sickla plant and will be around
14 kilometres long. The tunnel’s length goes via Bromma’s
south-west coastline, under Lake Mälaren to Eolshäll and
eastward to the pumping station at Sickla. The work on
the tunnel will be carried out, as far as possible, using
existing tunnel openings at Åkeshov (A), Liljeholmen (D)
and Sickla (F). During construction, these will need to be
supplemented with three new tunnel openings and the
intended work areas will be at Bromma/Smedslätten (B),
Eolshäll (C) and Gullmarsplan (E). A new pumping station
is planned for Sickla, under Hammarbybacken. A new flue
for tunnel ventilation is planned at Smedslätten.
The tunnel will be blasted at around 30–90 metres below
ground level and will largely be located underneath municipal land, but in some cases may also be underneath
private properties. All properties concerned will undergo
a thorough inspection both before and after the work.
There are many tunnels underneath Stockholm, and new
tunnels are constantly being built to meet the needs of the
growing city’s population. With current technology, it is
very unusual for properties above the works to be affected.
However, if any damage should occur, Stockholm Vatten
will remunerate the owner in full. The entirety of the works
is estimated to take four years and the tunnel is expected
to advance at around 20 metres per week. This means that
work underneath individual properties will be carried out
over a combined period of around 10 weeks.
ge
n
AN ENVIRONMENTAL INVESTMENT FOR THE FUTURE Existing tunnel opening and work area
New tunnel opening and work area
KUNGSHOLMEN
DJURGÅRDEN
GAMLA STAN
Riddar fjärden
Ström m e n
S al ts j ön
Henriksdal Waste
Water Treatment Plant
SÖDERMALM
G
Årst a viken
E
ÅRSTA
HAMMARBYHÖJDEN
Södra länken
F
Sickla Waste Water
Treatment Plant
JOHANNESHOV
0
1
2
3
4 Kilometer
EL & FIBER
ELECTRICITY & FIBRE
VATTEN
WATER
AVLOPP
SEWER
NYA AVLOPPSTUNNELN 30–90 m NEW SEWER TUNNEL 30–90m
BERGVÄRME
GEOTHERMAL HEATING
5
6 AN ENVIRONMENTAL INVESTMENT FOR THE FUTURE
EFFECTS ON THE ENVIRONMENT AND
RESIDENTS DURING THE CONSTRUCTION PERIOD
The scheduled work will affect residents, businesses and the environment during
the construction period. What will remain and be visible when the constructions
have been completed are access shafts in order to service the tunnel, as well as
a new ventilation flue in Smedslätten. Stockholm Vatten will conduct careful risk
analyses and give the greatest possible consideration to residents and others who
are affected, throughout the entire project.
IMPACT ON THE LOCAL ENVIRONMENT
TUNNELLING
GROUNDWATER
The tunnel will be created through the use of explosives
and drilling. The explosives will create brief vibration.
During the drilling, sound is transmitted through the rock,
which may create structural noise that may be disruptive.
There are restrictions for this kind of work that the contractors must adhere to.
During the construction period, the local groundwater level
will reduce. A key focus area for the project is to identify
and secure sensitive areas to minimise all types of potential
impact.
TRANSPORTATION
During the construction period, earth and rock will be
transported away from the tunnel through any and all
tunnel entrances. This transportation will be done on weekdays between 07:00 and 22:00. The aim is to ensure the
transportation is the least disruptive as possible. Emissions
and noise from construction traffic is estimated to be within
normal parameters. Measures will also be taken to minimise vibrations and other disruption from the construction
traffic, such as ensuring vehicles are driven safely on smaller
roads en route to the main roads.
GEOTHERMAL FACILITIES
Geothermal facilities closest to the tunnel may be impacted, directly through the tunnel’s location and indirectly
through the reduction of groundwater levels reducing its
output power. Stockholm Vatten will fully remunerate any
such negative impact.
RECREATION AND OUTDOOR LIFE
There may be an impact on recreation and outdoor
opportunities during the construction of tunnel openings,
workplace areas and due to construction traffic. However,
the water quality of Lake Mälaren will be improved once
the project is complete.
TEMPORARY LAND USE
CULTURAL ENVIRONMENT
During construction, workplace areas will need to be established next to the tunnel openings. These are necessary to
store materials, equipment, set up work buildings, environmental stations and service tents for vehicles and machinery.
These workplace areas will be returned to normal usage
once the work is complete.
Buildings and structures considered to be of cultural value
are largely located outside the expected area of impact.
The Ålstensgatan site of national interest and the sulphuric
acid factory listed building are built on clay soil, and will be
investigated for any potential impact. Saint Sigfrid’s church
will be further investigated for any impact from structural
noise and vibrations.
AN ENVIRONMENTAL INVESTMENT FOR THE FUTURE 7
MATADOR KOMMUNIKATION. PHOTO: KARI KOHVAKKA. ILLUSTRATION: BJÖRN LUNDKVIST.
Stockholm Vatten
Stockholms Framtida Avloppsrening [Stockholm’s Future Sewage Treatment]
Corporate ID No: 556175-1867
SE-106 36 Stockholm. Visiting address: Torsgatan 26. Tel: +46 (0)8 522 128 80.
framtidensavloppsrening@stockholmvatten.se
www.stockholmvatten.se/sfa
Part of the City of Stockholm