1. Pretreatment stage. The solids content of the initial slurry is normally very low, and it's required to grow the slurry concentration by gravity sedimentation or alternative means to decrease the processing price. The most widely used pretreatment technique is: blending the concentrated sludge using all the polymer flocculant, the substance is agglomerated from the flocculant, and also the delicate particles agglomerate and precipitate, and it will be a prep condition for its sludge dewatering on the home appliance sludge.
2. Gravity dehydration phase. The flocculated pretreated sludge is added to the filter buckle, and beneath the action of gravity, the free water beyond the floc is squeezed through the filter belt to decrease the water content of the sludge.
3. Following the gravity dewatering, the sludge starts to input the wedge-shaped pressing segment, along with the gap of this filter belt is slowly decreased, and the extrusion and shearing action is placed on the sludge to dehydrate the sludge back again. Following this point, the sludge fluidity is nearly entirely dropped, thus ensuring that under ordinary conditions the sludge won't be squeezed out from the media dewatering section.
4. The sludge is squeezed and sheared with a carefully constructed media roster system to get rid of a lot of capillary water, so the sludge moisture is slowly decreased to produce a sludge filter cake. In the separation of this filter buckle, the filter cake is discharged. Following the unloading, the filter fabric is washed and enters another cycle.
