Impulse drying technology can be applied to most primary and mixed primary/secondary cakes from pulp and paper operations. Results from the first two onsite trials illustrate some of the factors that govern dewatering including belt porosity, roll temperature, pressure, belt cleaning, ash content, sludge feed delivery, and sludge structure and type. Roll sticking is one of the most important factors that govern the application of the technology. The potential for roll sticking cannot presently be evaluated a priori. Refinements made in the unit as a result of these trials are discussed.

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