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11 models · Sludge Dewatering

Sludge Dewatering

Sludge dewatering equipment removes water from thickened sludge to produce a solid cake that is cheaper to transport, store and dispose of. It is used by municipal wastewater plants, industrial effluent plants, mining and mineral processing operations, and water treatment works.

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Sludge Dewatering illustration

Sludge Dewatering: available models

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How it works

How sludge dewatering work

Sludge is first conditioned, usually with a polymer flocculant, so fine particles bind into larger flocs that release water more easily. The conditioned sludge is then separated mechanically. A screw press squeezes sludge along a tapered screw inside a screen. A belt filter press drains sludge by gravity and then presses it between two belts around rollers. A plate and frame filter press pumps sludge into chambers lined with filter cloth under high pressure. A decanter centrifuge separates solids by centrifugal force in a rotating bowl. Vacuum belt and ceramic disc filters draw water through a filter medium under vacuum, mainly for mineral slurries.

Selection guide

How to choose the right model

  1. 01

    Sludge type and characteristics

    Biological, chemical, oily and mineral sludges dewater very differently. Feed solids content, particle size and organic fraction strongly influence the right technology.

  2. 02

    Target cake dryness

    Filter presses typically produce the driest cake, while screw presses and belt presses offer lower energy use and continuous operation. Match dryness to disposal route and cost.

  3. 03

    Throughput and operating hours

    Size equipment on dry solids load and the hours per day it will run. Batch machines such as filter presses need different sizing than continuous machines.

  4. 04

    Energy, noise and footprint

    Centrifuges are compact but use more energy and generate more noise. Screw presses run slowly with low energy and wash water demand.

  5. 05

    Operator attention

    Consider how much automation and supervision each machine requires, including cloth washing, cake discharge and polymer preparation.

Typical applications

  • Municipal wastewater treatment plants
  • Food, beverage and dairy effluent sludge
  • Pulp and paper mill sludge
  • Oily and petrochemical sludge
  • Mining tailings and mineral concentrates
  • Drinking water treatment residuals
  • Electroplating and chemical sludge

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FAQ

Sludge Dewatering: FAQ

Which sludge dewatering machine produces the driest cake?

Plate and frame filter presses generally produce the highest cake dryness because they apply high pressure in sealed chambers. The actual result depends heavily on the sludge type and conditioning.

What is the difference between a screw press and a belt filter press?

A screw press dewaters sludge inside an enclosed screen with a slow-turning screw, using little wash water and energy. A belt filter press handles larger flows on open belts but needs more wash water and operator attention.

Is polymer always required for dewatering?

Most biological and fine sludges need polymer conditioning to dewater effectively. Some coarse mineral slurries can be dewatered with little or no polymer.

How do I choose between a centrifuge and a filter press?

A decanter centrifuge runs continuously in a compact, enclosed footprint, while a filter press is a batch machine that typically achieves drier cake. Throughput, cake dryness target and energy cost usually decide the choice.

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Need sludge dewatering for your site?

Tell us the flow, the water or sludge you are treating and the result you need. A process engineer sizes the equipment and replies within one business day.

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