FREVAR KF Raymond Jørgensen Assistant operations manager at FREVAR. Water, wastewater and biogas Deputy Chairman of the Working Group on Biological Waste Treatment in AvfallNorge
What is FREVAR KF It is a municipal enterprise for Fredrikstad that operates: waterworks incinerators Landfill and recycling station sewage treatment plants biogas plants and upgrading
Waterworks The waterworks supply about 70,000 persons plus several industrial enterprises, amounting to about 35,000 population equivalents. In addition to the township of Fredrikstad, the municipality of Hvaler is supplied with water. The production amounts to an average of about 15 million m 3 annually or about 41,000 m 3 daily, with a maximum production capacity of about 70,000 m3/day.
Incineration plant The plant became operational in 1984 Treated waste per. year about.: 90.000 tonnes Energy delivered per. year about.: 220GWh (equivalent to approximately 22600 tons of heavy fuel oil) Energy recovery of prod. Energy: 99% Waste Suppliers: Fredrikstad 25% other municipalities and industrial waste 75%
Landfill The landfill receives approximately 50-75000 tonnes of industrial and bulky waste. It is non-recoverable and non-combustible residues deposited. Slag residues from FREVARs incinerators used as construction material in the landfill.
Recycling station Recycling station and collection point for hazardous waste. The recycling station at FREVAR, private households can deliver all forms of sorted household waste, which not can be included in the ordinary renovations. Here the waste is sorted into fractions by the quality criteria that is set.
Sewage treatment plant The system was designed for a load of 120,000 pe. Of this, approximately 70,000 pe from households and the rest from service companies, "dry industry" and process industry. Design wastewater quantities: Qdim = 1.800 m3 / h (500 l / s) Qmaksdim = 3.600 m3 / h (1000 l / s) Qmax = 4.540 m3 / h (1300 l / s) By Qdim wastewater using approximately 4 hours through the plant.
Sewage treatment plant Sludge from the sedimentation basins is thickened to obtain acceptable hygienic quality. During the pasteurization bacteria causing diseases are killed. Then digestion (anaerob stabilization) is performed, reducing the amount of sludge by about 25%. During stabilization methane is produced, at the same time as the disadvantage of foul smell is reduced. Finally the sludge is distributed to farmers, green areas or used at the FREVAR landfill
Biogas as fuel It all started when the local bus company called alternative fuel to diesel in 1997. It was created a company consisting of Frevar and the bus company, with a share of 50% each. After planning, tenders and construction were upgrading plant ready in December 2001
Biogas as fuel Upgrading plant consisted mainly of three steps. 1. compression, to get the gas to a pressure of 5 bars. Out of the compressor the gas keeps approximately 120 C 2. removal of water, the gas is cooled to about 5 C. gas is thereby partially dry. 3. methane enrichment, the plant uses pressure swing adsorption principle into four adsorption. units. Under pressure is CO2 adsorbed onto a layer of carbon, so that only CH4 passes adsorption vessel. After the strain of the carbon is pressure changed to a negative pressure to regenerate the carbon. The plant produces methane a tank while the other regenerates. A cyclic operation of all four vessels thereby ensures a continuous operation
Biogas as fuel As there were several buses we saw the need to increase and ensure consistent gas production. We then started reception of substrate and switched to the thermophilic digestate in 2005 The substrate consisted mainly of sterilized food waste. The temperature of the digester increased from 42 C to 62 C, with the result that all parameters increased, we were nervous a little while, but everything stabilized at a high level.
Biogas as fuel AGA took over the distribution of gas in 2008
Biogas plant In 2009 came the prohibition about landfilling of organic waste in Norway and the EU. We therefore decided to build a treatment for wet organic waste. Start of construction was in November 2011. It was completed and ready for adjustment in July 2013.
Biogas plant Biological treatment of organic waste from municipalities and waste from the food. Producing biogas to be used as environmentally friendly fuel for buses and other vehicles. Produce renewable and nutritious organic fertilizer that can be used in agriculture. Capacity of processing 30,000 tonnes of food waste a year. An important environmental and climate action; biogas and bio fertilizer can replace products based on fossil fuels
Biogas plant But just to have mentioned it, so I do not think there are any turnkey plants. We're still rebuilding to make improvements to the facility, but we are in the final stages now, we think. The biggest problems are that there are so considerable differences and consistency of the waste. With the result that there is clogging all over the plant, because there is much that is not organic, such as glass and grit among other things.
Upgrading But with a larger biogas production we also needed a new upgrading plant. So it was built the same time as processing facility and was ready for operation in August. This time the choice fell on a process of amine scrubber. It is a simple process in which the gas is washed with an amine solution, where CO2 binds to the fluid. Amine liquid is then heated so CO2 release the liquid and is ready for another round. The gas is then compressed up to 8 bar before it passes through a dryer to be dried to a dew point of -80 to - 90 C
Upgrading The biogas plant is built with the best available technology in the market. Upgrade of the gas takes place by removing of CO2 in a so-called amine process. This ensures that the biogas as fuel is CO2 neutral and provides an environmentally safe operation of gas cars in the future.
Frevar porn Thank you for your attention