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Pulp washing
Following the cooking and screening operations it is necessary to remove the waste liquor from the stock to produce high-quality pulp a typical stock washing operation Is the following. The rotary drum washer is designed such that the stock to be washed is introduced into a tank under the washing drum. The water of the stock passes through a wire screen on the surface of washing drum causing a pad of fibers to build up on the drum surface. The pad of fibers is raised up out of the tank by the rotation of the drum and washed further by showers located above the drum. The washed stock can be removed from the drum surface, mixed with water and pumped on to the next operation. The vacuum drum is divided ..into sections to allow the use of a partial vacuum inside the drum. The vacuum must be increased, as the thickness of the pad increases. As the drum continues to rotate, the vacuum may continue to remove water from the bottom of the pad as showerwater is being sprayed on the top. Such operations are called displacement washing. The water in the pulp is displaced by the cleaner water from the showers.

The counterflow washing principle is the following. The dirtiest stock is introduced into the first washer and is washed with the dirtiest water, which was obtained from the washing operation in the second washer. The countercurrent flow of washwater and the stock allows us to minimize the amount of fresh water required, and also increases the concentration of the chemicals in the wastewater removed from the first washer.

From this point in the treatment of the pulp, there is no difference between batch and continuous cooking operations.

pulp-целлюлоза