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Wastewater management
to protect bodies of water
“Bathing water quality for all of
Vienna’s bodies of water” – this is the
objective of sustainable wastewater
management in Vienna. Beside
structural measures and technological
innovation on sewer systems and
wastewater treatment plants,
this also requires measures near
the “source” of sewage flows.
The principle of “prevention rather than disposal” helps to save
resources and costs. An important element is to further the percolation
of unpolluted precipitation water.
Managing the Vienna sewer system
with the sewer information system KANIS
Following the compilation of existing location and technical data from
all infrastructure inventory maps available to Municipal Department 30,
the digital cadastre of Vienna’s sewage system is now almost completed.
This database contains all sewer system data in standardised formats,
which provides the basis for efficient, swift and simple planning of
management and maintenance work. As a global innovator, the City
of Vienna makes all digital sewer network data available
for downloading on the Internet.
“Sewage system management”
is a concept under which the storage
capacity of the sewage system is exploited
for interim storage of precipitation water.
This permits a more balanced capacity
utilisation of the treatments plants
and thus reduces investment requirements
and operation costs. Innovative technologies spanning the gamut from wastewater treatment and odour prevention
to advanced construction methods are
important elements of sustainable wastewater management in Vienna.
Efficient wastewater treatment
Vienna’s wastewater is collected in a sewer network of some
2,000 km length and treated at the main sewage treatment plant,
which attains an average efficiency rate of almost 90%. The primary goal
of efficient wastewater treatment is to preserve all of Vienna’s bodies of
running water as a living space for flora and fauna and a recreation resort
for the population. A second purification stage added to the main wastewater treatment plant will raise the plant’s already high
efficiency rate even further to more than 95%.
This project
is co-financed by
the European
Union.
INTERREG
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Trenchless sewer renewal
The sewer profile cutter developed
in Vienna is designed to slice off
a few centimetres of the old
sewer profile.
Subsequently a new high-strength
inliner is inserted into the expanded sewer section.
Municipal Department 30
Entsorgungsbetriebe
Simmering GmbH
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The principal advantages of this method are that only
a low amount of materials have to be transported to and from
the construction site and that it causes little traffic obstruction
and involves a minimum of noise and dust pollution.
Saving time and costs in sewer construction
Parts of Vienna’s sewer network are more than 100 years old
and no longer in a state to cope with the current sewage volumes
and static traffic loads and therefore require renewal.
The “Viennese approach” to sewer renewal permits the complete
renewal of an egg-shaped sewer section of 20 metres length
in a single day. By eliminating time-consuming work processes,
this method also helps to reduce costs.
Sewer systems
as an infrastructure component
for data transfer
The Vienna sewer system with a building
connection rate of almost 99% is the
most closely meshed network to qualify
for the insertion of data lines.
WIEN-KANAL – Abwassertechnologien
GesmbH developed a special technology
for inserting data line cables in sewers.
The data lines constructed in this way meet
all the requirements made on state-of-theart telecommunication networks.
In January 2000, the City of Vienna started the EUR 218 million
project of upgrading Vienna’s main sewage treatment plant in order
to meet the new standards required under the new EU Directives.
Within five years, the existing facility will be expanded and upgraded
into a state-of-the-art two-stage treatment plant. The plant’s
design capacity will be raised from 2.5 million inhabitant
equivalents (IE60) at present to 4 million IE60.
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Wastewa ter
Vienna, Urban and Environmental Technologies
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