Belt type filter press the whole working process can be divided into 3 basic stages: sludge flocculation, gravity pressure filter
press filter gravity dehydration, squeeze dehydration/Dewater.
1) Sludge Flocculation
Sludge dehydration before must first through the flocculation process, flocculation refers to using a flocculant (that is, a kind
of polymer, polymer electrolytes) was carried out on the suspension to processing, flocculants and sludge after mixing, the solid
phase particles in the suspension system to adhesive produces condensation phenomenon, and the solid phase liquid phase
separation. Sludge flocculation was conducted in the flocculation reactor and sludge in flocculation reactor residence time of
about 1 to 3 min
2) Gravity Dehydration
Approved by flocculation in the sludge moisture content 99.3% the thickener gravity dehydration, sludge moisture content up to
95-98%, in order to reduce the liquidity of sludge before squeezing, must emerge more free water and gravity dehydration zone is
to implement this function, the sludge in the filter pack is not affected by the external force, the filter belt sludge load
running section has an Angle, with the friction coefficient of filter with the mud and water, mud filter belt drag line up, down,
water accumulated sludge has a process, relatively extended the gravity dehydration time, out in favour of free water. Sludge
through a reverse return to squeeze the filter pack, before getting into two belt clamping press, in a single filter take random
operation, its role is to make the sludge evacuating,evenly distributed over the surface of the filter belt further dehydration.
3) Squeeze and Dewater
Sludge gravity dehydration, as the movement of the belt into the filter belt between the
wedge pressing section, to get to the compression,dehydration, and take off a part of free water on the surface of the sludge, and
then enter the consists of seven roller "S" shape of the press section, due to the sludge decreases as the filter belt between
multiple stick to the shear force produced by bending, to squeeze out internal free water.