Stora Enso, Finland, has ordered from Andritz, Graz, Austria, a new sludge dewatering line for thickening and dewatering of fibrous sludges at its board mill in Skoghall, Sweden. With a capacity of up to 750,000 metric tpy, Skoghall is one of the world's largest producers of liquid packaging board. Startup of the new plant is scheduled for April 2014.
The order includes a gravity table and a sludge screw press to process up to 50 metric tons of mixed sludge per day, thus significantly increasing the capacity of the existing sludge dewatering plants. The sludge to be dewatered consists of a mixture of fibrous and biological sludges, as well as chemical sludges from the mill's CTMP line. Andritz notes that the sludge screw press dewaters the mixed sludge to the highest possible dryness that can be achieved today by mechanical means.
To meet new process requirements resulting from the plant extension, Stora Enso's order also includes the rebuild of an existing Andritz belt press supplied in 1989. Due to the higher final dryness achieved through the dewatering lines in the future, Stora Enso Skoghall will be able to feed a higher amount of dewatered sludge to the power boiler and operate it with greater energy efficiency.
TAPPI
http://www.tappi.org/