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4 Sludge Dewatering Techniques: Which is Best for You?

Sludge de-watering.jpgSludge dewatering is an industrial process that separates sludge into solid and liquid components. It is done to minimise waste, and help companies and firms comply with regulatory requirements.

Sludge dewatering is useful to reduce the weight and bulk of materials before being transported or disposed of, which can reduce the cost of both processes.

It can be done in a variety of ways. The most prominent techniques include:

  • Plate and frame filter press dewatering
  • Centrifuge sludge dewatering
  • Belt press sludge dewatering
  • Geomembrane sludge dewatering

Consider further each dewatering technique below to help you decide on the right solution for your applications.

Plate and frame filter press

A plate and frame filter press separates the solids from the liquids using recessed chamber filter plates. In this system, two plates come together to form a chamber that applies pressure to the slurry to push the filtrate through the filter cloth lining in the chambers. The pressure compresses the solids into a cake, which is then dropped onto a horizontal conveyor. Plate and frame filter presses are often used when the highest sludge volume reduction is desired.


A centrifuge separates materials in sludge by spinning it in a rotating drum, The higher density material is pushed outwards. In this way, the solids are separated from liquids. The centrifuge technique is often used for three primary reasons: speed; when the quality of residual solid is not a priority; or when oil recovery is the main goal. Centrifuges also offer a smaller footprint compared to other sludge dewatering technologies.

Belt filter press

A belt filter press is often used when it is acceptable for the filter cake to have high moisture content. Common applications for belt filter press technology includes desludging of river silts, digester sludge, paper mill sludge, and biological sludge.


Geomembrane equipment is used to dewater light sludge. That is, sludge with a low proportion of solids to water. This technique is often used for basic types of residuals from wastewater, settling pond, and water filtration plants.

Which one is right for your application?

Sludge dewatering is a technique used in many industry sectors, including refineries, power plants, and wastewater treatment plants. Cost effectiveness and efficiency is always a primary concern in sludge dewatering.

Selecting the right process will depend on identifying the key factors that relate to the application in question. Sludge dewatering services, such as those provided by AQS Environmental Solutions, operate a wide range of equipment, allowing them to offer a variety of sludge services to suit your needs.


Mechanical Dewatering,

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