Stora Enso has awarded a contract to international technology group Andritz to supply a new sludge dewatering line for thickening and dewatering fibrous sludges for its board mill in Skoghall, Sweden.
The mill has a capacity of up to 750,000t of liquid packaging board a year. Andritz will deliver a gravity table as well as a sludge screw press to process up to 50t of mixed sludge per day. The new line is set to come on stream in April 2014.
The sludge screw press dewaters the mixed sludge, which comprises fibrous sludges, biological sludges and also chemical sludges from the mill’s chemical thermomechanical line.
The dewatering lines will enable the mill to feed a higher amount of dewatered sludge to the power boiler and operate it with better energy efficiency in the future.
Stora Enso, a Finnish pulp and paper manufacturer, also ordered the rebuild of an existing Andritz belt press supplied in 1989 to meet new process requirements resulting from the plant extension.
The Andritz Group supplies plants, equipment and services for hydropower stations, the pulp and paper industry, the metalworking and steel industries and solid / liquid separation in the municipal and industrial sectors.
Image: Headquarters of Andritz in Graz, Austria. Photo: courtesy of ANDRITZ.