The order includes a gravity table and a sludge screw press to process up to 50 t of mixed sludge per day, which will significantly increase the capacity of the existing sludge dewatering plant. The material to be dewatered consists of a mixture of fibrous and biological sludges, as well as chemical sludges from the mill’s CTMP line. The Andritz sludge screw press dewaters the mixed sludge to the highest possible dryness that can be achieved today by mechanical means.

In order to meet the new process requirements resulting from this 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.

With a capacity of up to 750,000 t/y, Skoghall is one of the world’s largest producers of liquid packaging board.

(Photo: © 2013 ANDRITZ AG)