disc filter

Definition of disc filter

Disc filter, also be called as disk filter, vacuum disc filter, is a vacuum negative pressure driven solid-liquid separation equipment for white water recovery and paper pulp thickening. Disc filter is usually used in the washing or bleaching process of chemical pulping or chemi-mechanical pulp.
disc filter


Disc filter mainly consists of main shaft, trough body, distributing valve, fan-shaped filter plate, discharging screw, etc. The structure is compact, so it occupies less space, but has high yield. It has high rate of fiber recovery and low consumption. There are various models and sizes for customers’ choice. With the great performance, our vacuum disc filter has successfully reached the national advanced standards.


disc filter

It is the best choice for white water recovery and pulp concentration. It can save energy and water, reduce fiber loss and prevent pollution. It is mainly used in the recovery of white water in the process of paper making and pulp making. The recovery rate of fiber is high, the recycling efficiency of water is high, the water consumption is less, and the pollution of white water can be reduced when the white water is reused. When used in pulp concentration, pulp emission concentration is high.

disc filter
disc filter parts

Main Technical Parameters




Disc Dia. (mm) 2500 3500 4500 5500
Per-disc filtration area (m2) 8.5 16.7 26 38
Capacity 0.6-3M3/m3.h (white water recovery)


0.7-1.5t/m3.d (pulp thickened)

Fiber recovery rate (%) >95
Filtrate clarity(mg/L) 20-80
Inlet consistency (%) 0.2-0.6(white water recovery)


0.5-1.2 (Pulp thickened)

Outlet consistency (%) 4-6(white water recovery)


4-15 (Pulp thickened)

MOC SS304 material for parts in contact with product
Vacuum degree (Mpa) 0.02-0.06
Net washing water pressure (Mpa) 0.7
Stripping water pressure (Mpa) 0.7

Series And Specifications

Disc QTY ZNH25 ZNH35 ZNH45 ZNH55
Overall dimension L*W*H(mm) Overall dimension L*W*H(mm) Overall dimension L*W*H(mm) Overall dimension L*W*H(mm)
4 3885*3035*4168      
6 4485*3035*4168      
8 5085*3035*4168 5510*4100*5361 6319*5450*6060  
10 5685*3035*4168 6210*4100*5361 7019*5450*6060 7415*6400*7235
12 6285*3035*4168 6910*4100*5361 7719*5450*6060 8115*6400*7235
14 6885*3035*4168 7610*4100*5361 8419*5450*6060 8815*6400*7235
16   8310*4100*5361 9119*5450*6060 9515*6400*7235
18   9010*4100*5361 9819*5450*6060 10215*6400*7235
20       10915*6400*7235
22       11615*6400*7235
24       12315*6400*7235
disc filter
disc filter

Disc Filter Operation Principle

  • The vacuum disk filter consists of separate fan disks. Each disc is a single filter unit, using a cover made of filter cloth to form a filter chamber.
  • The vacuum disc filter is driven by a motor connected to the reducer and the open gear mechanism. The filter plate rotates clockwise, at the same time, the vacuum pump produces pressure difference on both sides of the filter medium, which helps to attach the pulp in the filter chamber to the filter plate in the binding area.
  • After the cake forms slurry in the filter plate, when the cake leaves the liquid level, the mixer rotates to prevent the solid from settling, and the water is removed by vacuum.
  • Filter the filtrate through the cloth, through the filter tube, from the distributor.
  • Finally, the cake falls into the discharge tank. The whole operation continues.
diagram of disc filter

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