Case study - Veolia Water Solutions & Technologies

Case study
GARDERMOEN TREATMENT PLANT
- OSLO, NORWAY
Challenge
In June 1996 AnoxKaldnes was contracted to build a
wastewater treatment system for the municipality of
Ullensaker. It was decided by the Norwegian pollution
control authorities that a new system be built because
the old plant was not able to handle the special
demands of a new airport.
Located in close proximity to the Oslo International
Airport, the new Gardermoen Wastewater Treatment
plant faced many challenges. Firstly, it had to be covered
in part because it is a tradition in Norway to provide
a good working environment for the operators
i.e. eliminating annoying odours, noise and aerosols
and also because open basins would attract birds and
create a hazard for the airplanes.
Highlights
General information
Gardermoen Treatment Plant - Oslo, Norway
The Gardermoen treatment plant was constructed
to treat wastewater from the new Oslo International
Airport as well as the surrounding communities of
Ullensaker and Nannestad.
Concept
Spent aircraft de-icing fluid is a major pollution concern
at airports especially in areas with severe winter
climates. Currently Monopropylene Glycol (MPG) is
used for de-icing and during the planning process,
tests showed that it would be feasible to use runoff
from airport de-icing platforms as an external carbon
source for denitrification at the new plant.
OPERATIONAL SINCE: October 1998
Challenge
To treat complex airport wastewater combined with
de-icing fluid and municipal wastewater from nearby
communities.
Solution
Utilize the Kaldnes MBBR biofilm process for biological
Nitrogen removal, preceded by
primary treatment and followed by chemical precipitation
of Phosphorous and DAF for particle separation.
Effluent requirements
Total Phosphorous: 95% Removal (annual average)
- Average Concentration 0.25 mg/L
Total Nitrogen:
BOD 7
:
- Max. Concentration 0.5 mg/L
70% Removal (annual average)
70% Removal (annual average)
- Average Concentration 10 mg/L
- Max. Concentration 20mg/L

Design
The plant is constructed and designed for pre- and
post-denitrification. The external carbon source, the
MPG from the airport, is hence used for post-denitrification.
The biological treatment is followed by flocculation
and flotation for separation of sludge.
DESIGN LOAD
Dimensioning Flow: 920 m/h
Maximum Flow: 1,300 m/h
TBOD7 : 2,680 kg/d
TCOD: 5,480 kg/d
SS: 3,290 kg/d
TN: 704 kg/d
TP: 101 kg/d
Temperature Range: 4 o C - 14 o C
Results
Excellent plant performance since start-up.
Total nitrogen removal efficiency in 2001 was more
than 80% annual average.
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Performance Year 2000
In Out Removal
BOD 7
210 6.6 97%
COD 559 34 94%
TN 46 3 93%
TP 7.05 0.18 97%
SS 307 9 97%
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info@anoxkaldnes.com
www.anoxkaldnes.com
AnoxKaldnes
Klosterängsvägen 11A
SE-226 47 Lund, Sweden
Tel. +46 46-18 22 00
Fax. +46 46-13 32 01