MDS

Multi-disc screw (MDS) dewatering solution is widely used in municipal waste water treatment engineering as well as the industrial wastewater treatment systems such as processing, palm oil, pulp & paper, pharmaceutical industry and etc. It brings considerable economic and social benefits.

Principle:
MDS typically consists of 2 zones – Thickening zone and Dewatering zone.

  • Thickening Zone –upon mixing sludge water with polymer, here is where the solid-liquid separating process takes place and where the filtrate will also be discharged.
  • The pitch of the screw and the gaps between the rings decrease at the end of dewatering drum, hence increasing its internal pressure.
  • At the end, the End Plate further increases the pressure, so as to discharge dry sludge cake.
  • The filter cylinder is composed of fixed rings, moving rings and screw shaft.
  • Moving ring located btw the fixed rings.
  • Moving rings' diameter is smaller than outer diameter of the screw and its thickness is narrower than the space between fixed rings.
  • Moving rings are pushed up and down by screw shaft resulting clean solid out from gaps between fixed rings continuously and keep machine working well from clogging.

Comparison among available systems

 

MDS

Belt press

Frame filter 

Centrifuge

Construction

Low concentration of sludge

Yes

No

No

No

Operating 24 hrs automatically

Yes

No

No

No

Sludge thickener

No need

Need

Need

Need

Sludge tank

No need

Need

Need

Need

Power consumption

Low

High

Medium

High

Cleaning drench water quality

Low

Medium

High

Low

Operating noise & vibration

Low

High

Low

High

Sludge viscous requirement

Low

High

high

Medium

Foot print

Small

Large

Large

Medium

Maintenance

Low

High

Medium

High

Running cost

Low

High

High

Very high

 

Key features

  • Versatile:Wide application range - municipal sewage, food processing, chemical, palm oil,pulp & paper and etc.
  • Efficient:Simple, low investment & energy efficient.
  • Order:Unique flocculating agent making dewatering of sludge easier.
  • Consistent:Uniform and accurate dispensing.

Advantages

  • Low operating cost: Less than 40% of bely filter press and 20% that of centrifugal dewatering.
  • Energy efficient: Less than 5% of centrifugal dewatering.
  • Water saving: Uses less than 0.1% water than belt filter press.
  • Powder saving: Saving 60% in average.
  • Compact: Small foot print hence lesser civil, building and equipment cost.
  • Non-clogging: Effective in separating waste without clogging.