T H HE ENRIKSDAL

THE HENRIKSDAL
WASTEWATER TREATMENT PLANT
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Stockholm Vatten AB (the Stockholm Water Company) is an environmental and engineering company. The company is
characterized by its holistic approach and its consideration for the ecocycle.The company seeks to create the necessary
conditions for better water and an improved water environment, not least in the Baltic region, through its co-operation
with other local councils in the Stockholm region and through international joint projects.
The Stockholm Water Company produces and supplies drinking water to more than a million people in Stockholm and
Huddinge, and to a further nine neighbouring local councils. We also handle and treat the waste water from Stockholm,
Huddinge and six other neighbouring local councils. We own and operate the Norsborg and Lovö waterworks and the two
sewage treatments plants at Henriksdal and Bromma, as well as the tap water and sewage mains networks, pumping stations and water reservoirs, etc., in Stockholm and Huddinge. We are also responsible for the restoration of lakes and for
water conservation.
Sickla. See picture on back cover
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The Henriksdal waste water treatment plant, which serves Stockholm, Huddinge, Haninge, Nacka and Tyresö, is today one of
the largest and most modern in Europe. It was opened in 1941, when it had the capacity for the low-grade treatment of scarcely 150 000 m3 of waste water per day. The plant was extended in 1953, and its capacity was doubled. It has since been further
extended to include chemical and biological treatment. The most recent expansion programme, which lasted from April 1992
until April 1997, was undertaken to reduce nitrogen emissions by at least 50% and to provide improved phosphorus treatment.
Henriksdal is one of the world’s largest underground treatment plant. It covers approx. 300 000 m2, and it has approx. 18
kilometres of tunnels. The whole of the basin block lies inside chambers blasted into the rock. The surface facilities include the
control centre building, mechanical treatment, the sludge tanks, the upper parts of the sludge thickeners, the digesters, gas
holder, the gas collection plant and gas storage. The ventilation chimney is 80 metres tall and 7 metres in diameter. Sludge treatment takes place in a separate facility at Sickla, located about two km from Henriksdal. The population on top of Henriksdal is
1 630 persons. The plant lies 2 kilometres from Slussen on the boundary between Stockholm and Nacka.
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Treatment requirements:
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Values for the two treatment plants weighted in proportion to the
flow. From 30 June 2000: 8 mg BOD7/l and 0.3 mg P-tot/l as
quarterly mean values, 3 mg NH4-N/l as the mean value from
July to October, and 10 mg N-tot/l as the annual mean value.
2
Design data:
Number of persons connected: 700 000
Mean flow: 241 000 m3/24 hours
BOD7 load: 48 tonnes BOD7/24 hours
N-tot load (including rejects): 9 tonnes N-tot/24 hours
Qdim: 4.5 m3/s
Qmax: 10 m3/s
Qmax to biological stage: 8 m3/s
Qmax to filters: 10 m3/s
3
Flow measurement
The Henriksdal flow and the outlet flow are measured with an
echo sounder, and the Sickla flow is measured electromagnetically
4
Mechanical treatment
Also see picture on back cover
20 screens with distance between the bars: 3 mm
Make: Hydropress; Type: step screen
Henriksdal; 8 screens; Sickla: 10 screens for waste water and
2 screens for stormwater
Pumping station
The pumps lift the water from the primary-sedimentation to the
biological stage.
Pumps: 7 units of type Flygt PL7080
Lift height: 1.67 m at mean flow
Lift height at low flow: 1.49 m
Lift height at 8 m3/s: 1.80 m
Pump capacity: 7 units, 0.7 - 1.2 m3/s, 45 kW
10
Aeration tanks no of tanks: 7
Total volume: 204 000 m3, i.e. 29 000 m3/tank
Detention time at Qdim: 13 h
Detention time at 8.0 m3/s: 7 h
Zones/tank: 1 mixing zone for 1 400 m3
6 aerated or anaerobic zones, each for 4 500 m3, and
1 de-aeration zone for 710 m3
zone
length
width
mixing zone
zones 1-6
de-aeration zone
28 m
38 m
14 m
10 m
10 m
10 m
depth
5m
12 m
5m
Oxygen content: 1-3 mg 02/l as reference value
Air flow: approx.18 000 - approx.36 000 Nm3/h for normal operation
Aerator type: fine-bubble rubber membrane aerator
Make of aerator: Sanitaire
Number of aerators: 19 000 units
Grit chambers no of grit chambers: 4
Also see picture on back cover
Total volume: 2 400 m3
Detention time at Qdim: 9 min
Detention time at Qmax: 4 min
Henriksdal: 2 grit chambers, each with a volume of 590 m3
Sickla: 2 grit chambers, each with a volume of 630 m3
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6
Pre-precipitation with ferrous sulphate:
6a Henriksdal inlet
6b Sickla inlet
Total: 11-20 g Fe/m3
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7 Pre-aeration pre-aeration channels
Total volume: 1 100 m3
Detention time at Qdim: 4 min
Detention time at Qmax: 1 min
Henriksdal: 2 channels, each with a capacity of 260 m3
Sickla: 590 m3
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Primary sedimentation
no of compressors: 5
air/compressor, max. 15 000 m3 air/
Capacity: min. 6 800
compressor. Power requirement: min. 250 kW/compressor, max.
530 kW/compressor.
Speed: max. 18 000 rev/minute
Make: HV-Turbo A/S (Denmark).
Type: KA 10SV
m3
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no of tanks: 13
Total volume: 30 000 m3
Total area: 8 200 m2
Detention time at Qdim: 1.8 h.
Detention time at Qmax: 0.8 h.
Surface load at Qdim: 2.0 m/h.
Surface load at Qmax: 4.4 m/h.
Type of scrapers: Line scrapers
Aeration system
Secondary sedimentation tanks
tank
tank
length
width
depth
F1-F8
F9
F 10 - F 13
60 m
60 m
70 m
10 m
10 m
10 m
3.6 m
3.7 m
3.7 m
no of tanks: 14
Total volume: 58 000 m3
Total area: 11 000 m2
Detention time at Qdim: 3.6 h.
Detention time at 8.0 m3/s: 2.0 h
Surface load at Qdim: 1.5 m/h.
Surface load at 8.0 m3/s: 2.7 m/h.
Type of scrapers: Line scrapers
E 1 - E 11
E 12 - E 14
length
width
80 m
80 m
10 m
10 m
depth
5m
6m
For a sustainable
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15
9
14
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FeSO4
FeSO4
STEP SCREEN
PRIMARY SEDIMENTATION
GRIT CHAMBER
SECONDARY
SEDIMENTATION
BIOREACTOR
SAND FILTER
HEAT PUMP PLANT
BALTIC SEA
PREAERATION
BIOGAS TO
HAMMARBY SJÖSTAD
AIR BLOWER
PRIMARYSLUDGE
SURPLUS
SLUDGE
SCRUBBER
CENTRIFUGE
BIOGAS
FOR VEHICLES
BIOGAS
DIGESTER
GASHOLDER
SLUDGE TANK
FAT
INTAKE
FAT
TANK
SLUDGE
HOLDING
TANK
INTERNAL HEATING
AND ELECTRICITY
THICKENER
POLYMER
CENTRIFUGE
society
Sickla plant.
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6b
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29
25
28
8
16
20
18
7
23
19
6a
17
24
5
4
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Secondary precipitation
Precipitation with ferrous sulphate on filters with 1-4 g Fe/m3
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Pumping station
12 pumps lift the water from the biological stage to the filters.
8 speed-controlled propeller pumps
Type: Flygt 7060
Capacity: 0.35 - 0.75 m3/s at 2.7 - 3.7 mvp.
4 speed-controlled propeller pumps
Type: Flygt 7080
Capacity: 0.55 - 1.1 m3/s at 2.9 - 3.7 mvp.
Lift height: 3.05 m
Sand filters no of filters: 60, divided in 4 block
Type: Downstream, 2-media, deep-bed filters
Total area: 3 600 m2
Filter area: 60 m2/filter
Load, max.: 10 m/h
Filter material, upper layer: 1 m expanded clay, Ø 2.5 - 3.5 mm
Filter material, lower layer: 0.5 m sand, Ø 1.2 - 1.9 mm
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2 digested sludge thickeners at Sickla:
Total volume: 1 600 m3
Diameter: Ø 18 m
Depth: 7 m
Total area: 510 m2
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Dewatering of sludge
Also see picture on back cover
no of centrifiuges: 4
Capacity per centrifuge: 30 m3/h
Alfa Laval NX4500
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See picture on back cover
Silo for dewatered sludge
Total volume: 800 m3
no of silos: 2
See picture on back cover
Gas engines no of gas engines: 4
Electrical output: 700 kW at 100% load/each
Thermal output: 950 kW at 100% load/each
Jenbacher (Austria)
Type: JMS 316 GS-B.L 4-stroke internal combustion engine,
16 cylinders
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Boilers
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Ventilation
no of boilers: 3
Boiler 1: output 2.9 MW
Boiler 2: output 2.5 MW
Boiler 3: output 1.5 MW
Make: Osby Parca AB, Weishaupt combination burner for oil/gas
Air capacity: 425 000 m3/h
3 air replacements/h in coarse cleaning, sand trap and
container hall
2 air replacements/h in the rest of the plant
Digesters no of digesters: 7
Total volume: 39 000 m3; Temperature: 35 - 37 °C
Detention time: approx. 19 days
16
digesters
volume
R 1 - R 4, R 7
R 5, R 6
5 000 m3
7 000 m3
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height: bottom
to surface of sludge
22 m
28 m
Heat exchanger digester sludge
Heat effect daily 760 kW/h
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28
Gas collection plant
Gas storage
Total volume: 7 000 Nm3
no of centrifuges: 5
Capacity: 5 x 50 m3/h
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Receiver station for organic waste
Amount of organic waste: approx. 24 000 m3/year
Capacity: line 1: 400 Nm3 biogas/hour
line 2: (planned 2005) approx. 500 Nm3/hour
Gas holder
Excess sludge centrifuges
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Volume: 5 000 m3
Utilized volume: 4 000 m3
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All exhaust air passes through a heat recovery plant, which
returns approx. 55% of the energy contained in the exhaust air
to the supply air unit in fan room 1.
In fan room 2, the supply air is pre-heated to +5°C with treated
waste water and is re-heated to +20°C with heat recovered from
the blowers.
Sludge thickeners
2 sludge tanks at Henriksdal:
Total volume: 10 000 m3
Diameter: Ø 23 m
Depth: 10.5 m at the periphery, and 13 m at the centre
Total area: 830 m2
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LNG storage (planned 2004)
Storage volume: 2 x 33 000 Nm3/m
Flow capacity: approx. 900 Nm3/m
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Sewage to Henriksdal
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Digested sludge from Henriksdal
See picture on back cover
See picture on back cover
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5
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T
AL
LABEL
NV
341 065
I RONMEN
Henriksdal Wastewater Treatment Plant
Värmdövägen 23, SE-131 55 Stockholm, Sweden
Phone: +46 8 522 133 00, Fax: +46 8 522 133 02
EO Print 2004
Lic.nr 341065
Upplaga: 1 000 ex
Sickla plant.
E
Lundquist & Co
Foto: Thomas Henrikson
Illustrationer: illtek
Miljömärkt trycksak
NORDIC
Stockholm Water Company
SE-106 36 Stockholm, Sweden
Phone: +46 8 522 120 00, Fax: +46 8 522 120 02
[email protected]
www.stockholmvatten.se
Visiting addres: Torsgatan 26
A member of the Stockholms Stadshus AB group