IVAR's object is to build and operate joint municipal ... Dokumenter... · treatment plants The Vik...
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Transcript of IVAR's object is to build and operate joint municipal ... Dokumenter... · treatment plants The Vik...
IVAR's object is to build and operate joint municipal treatment plants for water, sewerage and solid waste.The company's vision is to ensure that the region benefits from the market's most competitive services.
Sources and water treatment
Transport facilities Landfills Composting Wastewater
treatmentGeneral
maintenance
Operations Marketing anddevelopment
Managing director
Board of directors
Supervisory board
Planning/construction
Finance/Administration
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Owned by eleven municipalitiesIVAR is owned by the following municipalities: Finnøy,
Gjesdal, Hå, Klepp, Kvitsøy, Randaberg, Rennesøy,
Sandnes, Sola, Stavanger and Time. Together, these
municipalities have approximately a quarter million
inhabitants.
This region is one of the most active in the country
in terms of the economy and demographic trends.
Development of the technical infrastructure is a key
prerequisite for this activity.
A total of 84 IVAR employees were responsible for
a turnover of approximately NOK 280 million in 2003.
A challenging future IVAR has achieved exellent results. However, IVAR is
facing demands of increasing the efficiency within the
scope of handling wastewater, water and solid waste.
Our response to these challenges is to further
develop the regional cooperation, both in width and
in depth. The goal is to ensure that regional objectives
and a long-term perspective continue to play a key
role in our industry.
IVAR is at work 24 hours a day
Organisation chart
IVAR's facilities
Water main
Raw water tunnel
Municipal borders
Wastewater main
Our drinking water is subject to the most
stringent requirements for hygienic water
quality – a quality you can taste! IVAR
supplies the entire Jæren region with the
highest quality drinking water.
Plenty of water - good waterWater is the most important element of our nutrition.
Drinking water is basic for all human activity. Traditionally,
we have had good access to water in Norway, and we
have developed a culture in which plenty of pure, clean
water for everyone is taken for granted.
IVAR's responsibility for water sources, water treat-
ment and transport to the respective municipalities
requires huge investments and reliable technical
solutions. Distribution to the consumers takes place
through the municipal water distribution system.
Sources for drinking waterThe primary sources for water supply to the Jæren region
are located in the municipalities of Bjerkreim, Gjesdal and
Hå. Stringent environmental demands apply to the water
source areas. Governmental restrictions on farming and
traffic ensure the raw water quality.
A small power plant has been built into the tunnel
from Stølsvatn lake to exploit the downward gradient
of the water flow from source to water treatment plant.
The water treatment plants are located at Langevatn
lake in Gjesdal municipality and in Matningsdal in Hå
municipality.
The water quality at the sources has low water
hardness. The water has low colour index and low
contents of humus and nutrients. IVAR perform
analysis (limnology) of the water sources regularly.
The best drinking water comes
from your tap
The highest requirement for water qualityThe Langevatn water treatment plant has the capacity
to treat 2500 litres of water per second. CO2 is added
to the water upstream the marble filters to increase
release of lime from the marble.
As a nutrient, drinking water is subject to stringent
quality requirements. All water delivered from Langevatn
is passed through alkaline filter material and disinfected.
Both the process and water quality are continuously
controlled and assured.
An absolute requirement for all drinking water is
that it must be hygienically safe. Good drinking water
is without noticeable smell, taste and colour.
30-km water mainIVAR's water supply system consists of three main
components: Transport facility for raw water, the
Langevatn and Matningsdal water treatment plants
and the transport system for drinking water.
The new water main extends approximately 30 km
from Langevatn lake to Tjensvoll. The water main has
a diameter of 1400 and 1200 mm. Valve chambers
have been established along the main, allowing the
water to be shut off or diverted, and this is where
the municipalities have their distrubution points.
IVAR's water mains are designed and engineered
to safely transport water for at least 100 years.
The Langevatn water treatment
plant supplies drinking water to
nearly a quarter million people.
Orstad valve chamber.
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IVAR receives and treats about 90 % of all
wastewater from the joint municipalities.
Our goal is to ensure that discharges of
wastewater do not harm rivers or the sea.
Treating wastewater – for the benefit of the environmentIn the areas along the coastline in the southern point
of Norway, focus has traditionally been on removal of
phosphorus and particles in the wastewater. Most of the
major wastewater treatment plants along the coastline
– including IVAR's plant in Randaberg – are therefore
based on chemical precipitation (primary precipitation).
Norway is obliged through the EEA Agreement to
comply with the treatment requirements in the 1991
Urban Waste Water Directive. IVAR's goal is to accomplish
this, using costeffective and environmentally beneficial
solutions.
SNJ – one of Norway's largest wastewater treatment plantsThe Regional Wastewater Treatment Plant of Nord-Jæren
(SNJ) receives and treats wastewater from residentials
We treat wastewater – for a sustainable environment
and industry in the municipalities of Randaberg,
Stavanger, Sola, Sandnes and Gjesdal.
The design capacity is equal to a total number of
inhabitants and population equivalents (PE) of appro-
ximately 240 000. The plant is located at Mekjarvik in
Randaberg. The wastewater treatment facilities are located
in rock while the sludge treatment, administration
building and workshop facilities are located outside the
rock. The plant was put in operation in March 1992.
The plant comprises an 8-km inlet tunnel from
Bjergsted in Stavanger, as well as a 4-km outlet tunnel
to Håsteinfjorden with discharge at a water depth of
80 metres, 1.2 km offshore.
The plant is constructed as a primary precipitation
plant where the wastewater is mechanically pretreated in
screens and aerated grit chambers. Chemicals are induced
to initiate precipitation. Produced particles are deposited
in sedimentation tanks. Two separate trains ensure a high
level of operational flexibility.
Produced pellets used for soil improvementOne of Norway's national objectives is to ensure that as
much as possible of the nutrient content in the sludge
generated at the wastewater treatment plants, can be
returned to the soil.
The sludge from the sedimentation tanks consists of
95 % water, which means that the dried solids
content amounts to just 5 %.
The solids content after centrifugal
dewatering and thermal drying is about
85 %. The dried product is formed into
small pellets (biopellets) that are simple
to store, handle and transport. The final
product is pathogenfree and meet the
governmental standards for recycling.
35-km main sewerThe wastewater is transported from Gjesdal in south via
Sandnes and Stavanger to the wastewater treatment
plant in Randaberg. The transport system consists of
gravity flow lines, pumping stations with associated
pump lines and tunnels.
The inlet tunnel from Bjergsted in Stavanger has
a diameter of 3.5 metres. The tunnel has a volume of
77 000 m3 and functions as a equalization resorvoir.
Additional wastewater treatment plantsThe Vik wastewater treatment plant, which receives and
treats wastewater from Time and Klepp municipalities, is
a biological plant. Phosphorus and organic substances
are removed from the wastewater in an activated sludge
process – bacteria do the job of cleaning the wastewater.
The Oltedal wastewater treatment plant receives
wastewater from the residents of Oltedal and process
water from industrial activities in the area. This plant is
a combined biological and chemical plant.
The Bore wastewater treatment plant receives
wastewater from the residents of Klepp municipality
and industry. The plant performes mechanical treatment
in sieves, and is designed for 20 000 equivalents (PE).
The same applies to the Sirevåg wastewater treatment
plant, which receives and treats wastewater from
residents and industrial activities in the Ogna and
Sirevåg areas. The plant’s designed capacity is 15 000 PE.
The sludge from Vik and Oltedal plants is transported
to SNJ in Mekjarvik.
Process controlIVAR's different plants are distributed over a large
geographic area. Several of the plants have relatively
complicated processes. Computer-based control and
monitoring systems are applied for safe and efficient
operation.
1. Sedimentation basin, SNJ
2. Regional Wastewater Treatment Plant, Nord-Jæren
3. Biopellets
4. Vik Wastewater Treatment Plant
5. Sentral control room at SNJ
IVAR receives and processes solid waste
from municipalities' waste disposal services.
IVAR works with a number of private and
public organisations with the objective of
ensuring improved exploitation of solid waste.
Less waste to landfills – more to recyclingFor many years, the Sele landfill was the largest facility
of its kind in Norway. In 1997 we received nearly 140 000
tonnes of waste at the landfill.
As a consequence of our work to exploit our resources
better, we now see that the volume of residual waste
ending up at the landfill has been substantially reduced.
In 2004 we expect to receive of about 30 000 tonnes of
residual waste. The recycling rate for household refuse
in the IVAR region will then be well above 90 %, which
means that the overall recycling rate exceeds the national
goals set for 2010. We are demonstrating Norwegian
waste management policy in practice.
Requirements for the solid wasteIVAR's discharge permit from the County Governor
of Rogaland has strict requirements for the residual
waste at the landfill. Waste can only be disposed
when there are no recycling options.
We transform your refuse into
valuable resources
1. and 2. The Sele landfill receives solid waste from the IVAR
municipalities.
3. Gas collection facility at Sele landfill.
4. The Sele recycling station receives sorted waste.
5. The Hogstad composting plant makes nutrient-rich compost
out of food and garden waste from the entire Jæren region.
Incineration of gas to reduce global warming"Landfill gas" is formed when organic waste decomposes.
The main components of this gas are methane and
carbon dioxide. Methane is about 20 times more harmful
than carbon dioxide in respect to global warming (the
"greenhouse effect").
Therefore, we collect the landfill gas and ensure
that it is incinerated, converting the methane gas into
carbon dioxide.
Incinerating the gas from Sele provides benefits to
the invironment equivalent to avoiding the emission
from 20 000 cars.
This gas is a high-quality energy source which should
not be wasted. There is a potential at Sele to deliver
25–30 million KWh of power per year for many years
to come. The gas is sold to Klepp Energi for exploitation
as a heat source.
Improving the environment at the landfillIVAR has done much to reduce the burden on the
environment in the areas surrounding the landfill.
Norway's largest bird net – 90 000 m2 – covers the
active landfill area to keep birds away. The bird net
additionally prevents plastic and paper from beeing
spread outside the landfill area.
Proper compression of the waste and regular
inspections keep vermin away.
Rain that runs into the landfill and becomes polluted
(leachate), is collected in a network of pipelines in the
bottom of the fill. The leachate is routed out into the
North Sea in open waters about 600 m from land at a de-
pth of 15 m. These discharges are monitored and the
surrounding areas show no signs of pollution damage.
Recycling station for sorted wasteAt Sele and Forus recycling stations, private customers
and businesses can deliver sorted waste and garden
waste. Processed compost can also be purchased from
Forus, Sele (garden and park waste) and Hogstad
(biowaste/garden and park waste). The compost is
well suited as a soil conditioner or as ground cover
to prevent the growth of weeds.
One of Europe's most modern composting plantsIVAR owns and operates the Hogstad composting plant
located in the municipality of Sandnes. This is Norway's
largest composting plant; handling as much as 28 000
tonnes of food and garden waste each year from
approximately 250 000 residents of the Jæren region.
The result of this process is 14 000 tonnes of nutrient-
rich compost.
The composting conditions in the plant are optimal
– with respect to moisture and temperature. The entire
process takes place indoors in a fully automatied,
computercontrolled composting hall of about 3500 m2.
The compost is sifted and matured to ensure
good quality.
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Incineration of the gas.
Norway’s largest bird net.
10
Energy is recovered from residual waste. The
energy is used for production of electricity
and district heating for customers in Sandnes,
Sola and Stavanger. The plant is situated on
IVAR's site at Stokka in the municipality of
Sandnes while the incineration plant is owned
by IVAR IKS, Lyse Energi AS and Energos ASA.
Together, the three companies have formed
Forus Energigjenvinning KS.
Valuable use of resourcesWaste that previously ended up in landfills, now
represents useful resources when converted into energy
through an environmental friendly process. By using
the energy resources from waste, we can reduce demands
of energy from alternativ sources.
The Stokka plant processes approx. 40 000 tonnes
of residual waste per year – producing 86 GWh thermal
energy in the form of superheated water. The water is
delivered to Lyse Energi and is distributed as district
heating.
The energy exploitation rate will be somewhat higher
than 50 % in the first few years, then gradually increasing
The energy recovery plant – part of Forus Miljøpark
Forus Energigjenvinning's recovery plant
at Stokka is constructed on a site that
is zoned for this purpose. The plant is
centrally located in relation to the waste
sources in the region, and has major en-
ergy consumers located nearby.
All in all, the region now offers a
full range of services that fully comply
with all national requirements relating
to waste management. The recovery
rate will be about 90 %.
to 70–80 % as the district heating distribution system
is developed. The plant will be in contineus operation,
and will produce energy equivalent to the consumption
of about 4000 homes.
What kind of solid waste is used by the plant?The waste that goes to energy recovery is residual waste
after valuable materials have been sorted out. The
majority of the waste is residual waste from households,
while a smaller portion comes from trade and industry.
Why is it important to reduce consumption of oil and electricity for heating?For Forus, the development of district heating and
exploitation of energy recovered from solid waste will
contribute to reduced consumption of fuel oil by the
businesses in the area. The transition to district heating
will reduce the need of electricity.
District heating is an environmental friendly and
progressive method of supplying heat that will help
contribute to less pollution.
IVAR IKS • Breiflåtveien 16/18 • StavangerP.O.Box 8134 • 4069 Stavanger
Telephone +47 51 90 85 00 • Fax +47 51 90 85 01E-mail: [email protected] • www.ivar.no
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