The recycling process in brief:
Dredging: Two dredges from Mud Cat remove biowaste and fiber sludge from sediments in the Korsnas purification basins. Dredging is operated by NCC Milman.
Dewatering: The dewatering facility removes 95-97% of the water content of the sludge in dewatering tables and a sieve-belt press. High retention is obtained along with high hydraulic flow. Dewatering is operated by USF Aquaflow.
Fuel preparation: The sludge is spread out on working areas where it is dried by the sun and wind.The sludge is processed when the temperature is above freezing and harvested during the summer months with a drycontent of 60-80%. A certain amount of dry material is composted for processing various soil additives. Fuel preparation is operated by Econova.
Combustion: Combustion is handled by Karskar Energy AB where the energy content of the dried sludge can be utilized for Korsnas processing.
Ash management: The ash produced during combustion is used as a construction material in the fuel preparation process.
The Recyclers’ business concept is to offer a total solution in which various waste products from the forestry industry are processed and refined for subsequent utilization as energy sources for industries and communities.
The company says the MC-2000 is effective on various types of operations, from removal of sediment and sludge to recovery of fly ash and tailings.
Bay West is using the dredge to remove contaminated river sediments from Gruber’s Grove Bay in Lake Wisconsin. The dredge is pumping the material into geotextile bags, which will be buried for permanent containment.
Bay West provides environmental, industrial, marine, and emergency services to commercial and government customers nationally and has offices in St. Paul, Minnesota and Kansas City, Kansas, and project offices in Baraboo, Wisconsin, Seattle, Washington, Kellogg, Idaho, Hastings, Nebraska, and Kalamazoo, Michigan.
Atervinnarna – The Recyclers
Korsnas first with outsourcing
The Recyclers take complete responsibility for waste product management at the Korsnas plant. This means that valuable biofuel can be created from waste products that were previously discarded.
“It’s even cheaper than when we just heaped everything up because the disposal taxes would amount to up to SEK 100 million a year. Outsourcing waste treatment is a good solution for us,” says Hans-GÃsta Henriksson, environmental engineer at Korsnas.
Recycling facility in operation
At the Korsnas plant, The Recyclers have planned and built a facility for treatment of biowaste and fiber sludge from Korsnas AB. The facility began operation in September 1999, after which The Recyclers have operational responsibility for a period of 10 years.
At the Korsnas plant The Recyclers produce biofuel and enriched soil from the sludge processors. The Recyclers also handle the ash produced in burning the biofuel in the bark boiler at Korsnas. So Korsnas completely avoids the sludge disposal fees that took effect in 2000.
By having The Recyclers take over this function, Korsnas gets access to an environmental improvement process without loading its bottom line with new investment. This meant low financing costs as well as a facility with an optimized operating efficiency and an excellent working environment.
The Recyclers cooperated on this project with NCC, Milman, USF Aquaflow, Mud Cat, Econova, and with Nordbanken Finance for financing.
You’re welcome to contact
For further information
by telephone: +46-8-655 11 91 or by fax at +46-8-655 12 91
NCC Facilities and our specialties are represented all over Sweden. Specialist capabilities for environmental dredging are based in Kalmar and Ljungsbro. You can contact us by telephone at +46-480-47 64 26 or +46-13-637 55, or call your local NCC representative.
170 80 SOLNA
Telephone: +46-8-655 20 00 Fax: +46-8-624 05 19
Excerpted from NCC Milman Brochures