A row of DD-Washers
  • ANDRITZ GROUP
  • PULP & PAPER products
  • Pulp production
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  • DD-Washer drum displacer washer

ANDRITZ DD-Washer™

Superior washing, globally preferred and proven

The key benefits of the ANDRITZ DD-Washer™ drum displacer washer are its low operating costs, low emissions, and extremely high washing efficiency in a design that offers a flexible number of displacement washing stages in a single unit. With almost 400 washers currently in operation all around the world,  its proven multi-stage washing efficiency is clearly preferred for brownstock, post-oxygen and bleaching washing.

Efficient washing without mechanical pressing

The ANDRITZ DD-Washer drum displacer washer provides superior washing while being extremely gentle to fibers since no mechanical pressing is required for washing. It can be flexibly configured with from one to four displacement washing stages in a single unit, which greatly simplifies mill layouts and plant efficiency.

An innovative design which allows the use of fractional filtrates reduces the amount of chemicals required for oxygen delignification and bleaching. With a single motor and no energy utilized for mechanical pressing, it is extremely energy efficient. Countercurrent washing allows reuse of water – lowering consumption and sending less effluent to the treatment plant.

Increased throughput

Recent innovations to the pulp and filtrate hydraulics increase throughput: the largest DD-Washer drum displacer washer in operation today is 6,250 t/d – more than 150 times the capacity than when the washer was introduced in 1983.


DD-Washer drum displacer washers in MetsäFibre's bioproduct mill. Äänekoski, Finland.

© ANDRITZ

This characteristic angular shape is an increasingly common sight in pulp mills around the world.

© ANDRITZ

DD-Washer – Made in Finland

ANDRITZ Savonlinna Works - where the DD-Washer drum displacer washers are made.

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  • DD-Washer - Getting the most out washing PDF : 438 KB