In impulse drying, a hot roll is applied to a wet web, and the pressure of the steam generated within the web expresses water in liquid form. The technique has been applied to sludge dewatering and a full-scale unit has been constructed. The machine incorporates a belt that conveys
the sludge through a nip, a heated top roll and a cold lower roll. An open upper belt sinks into the web to give it “body” and assist its transport through the nip. A typical solids increase of up to twenty percentage points over belt-pressed sludge can be realized if the sludge
is predominantly comprised of primary material. The throughput is of the order of 2 dry tons per meter per hour, but decreases with increasing biological content of the sludge.
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