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

Transcription

1 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.

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3 IVAR is at work 24 hours a day Owned by eleven municipalities IVAR 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 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. Organisation chart Supervisory board Board of directors Managing director IVAR's facilities Water main Raw water tunnel Municipal borders Wastewater main Operations Marketing and development Planning/ construction Finance/ Administration Sources and water treatment Transport facilities Landfills Composting Wastewater treatment General maintenance 3

4 The best drinking water comes from your tap 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 water Water 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 treatment 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 water The 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.

5 The highest requirement for water quality The Langevatn water treatment plant has the capacity to treat 2500 litres of water per second. CO 2 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. The Langevatn water treatment plant supplies drinking water to nearly a quarter million people. 30-km water main IVAR'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. Orstad valve chamber. 5

6 We treat wastewater for a sustainable environment 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 environment In 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 plants The Regional Wastewater Treatment Plant of Nord-Jæren (SNJ) receives and treats wastewater from residentials 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 approximately 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 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 improvement One 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.

7 35-km main sewer The 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 m 3 and functions as a equalization resorvoir. Additional wastewater treatment plants The 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 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 PE. The sludge from Vik and Oltedal plants is transported to SNJ in Mekjarvik. Process control IVAR'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

8 We transform your refuse into valuable resources 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 recycling For many years, the Sele landfill was the largest facility of its kind in Norway. In 1997 we received nearly 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 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 We are demonstrating Norwegian waste management policy in practice. Requirements for the solid waste IVAR'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. 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.

9 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 cars. This gas is a high-quality energy source which should not be wasted. There is a potential at Sele to deliver million KWh of power per year for many years to come. The gas is sold to Klepp Energi for exploitation as a heat source. Incineration of the gas. 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 depth of 15 m. These discharges are monitored and the surrounding areas show no signs of pollution damage. Recycling station for sorted waste At 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 plants IVAR owns and operates the Hogstad composting plant located in the municipality of Sandnes. This is Norway's largest composting plant; handling as much as tonnes of food and garden waste each year from approximately residents of the Jæren region. The result of this process is tonnes of nutrientrich 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 m 2. The compost is sifted and matured to ensure good quality. Improving the environment at the landfill IVAR has done much to reduce the burden on the environment in the areas surrounding the landfill. Norway's largest bird net m 2 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. Norway s largest bird net. 9

10 The energy recovery plant part of Forus Miljøpark 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 resources Waste 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 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 to % 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. 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 energy 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 %. 10

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12 IVAR IKS Breiflåtveien 16/18 Stavanger P.O.Box Stavanger Telephone Fax KOLON Photo: Bitmap, Odd Furenes, Odd Inge Worsøe, Leif Terje Øvernes Ill.: Svein Bjur Print: Grafo Trykkeri as