Gravity Belt Thickener Equipment

Gravity Table

Gravity belt thickeners are a very cost-effective means of thickening sludge. The simplicity of the gravity belt thickening equipment & machinery makes it easy to maintain and its low power consumption makes it inexpensive to operate. Compositech's GT series of gravity belt thickening equipment, also known as gravity belt thickeners, are typically found in municipal wastewater plants, but may also be used in industrial wastewater facilities. Compositech's gravity tables are designed to concentrate sludge, by means of gravity drainage of water through a permeable synthetic belt. Our design provides for extended drainage of dilute, high volatile, and unstable sludges. Our gravity tables are designed for continuous 24-hour per day, 365 days per year operation with minimal maintenance.

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How Do Gravity Belt Thickeners Work?

Compositech's gravity belt thickening equipment employs the forces of gravity for filtration in order to allow liquid to drain from the sludge through a single woven cloth filter belt. Initially, the liquid sludge is conditioned by adding polymers to obtain a separation between the liquid phase and the solid phase. Once flocculated, the sludge passes through the feeding box onto the synthetic belt supported by a high-density polyethylene (HDPE) grid which is supported by a stainless steel framework. The free water is separated by a combination of gravity and atmospheric pressure. In addition to supporting the gravity belt thickener, the HDPE grids break the surface tension on the underside of the filter media and encourage the free-standing water to drain through and be collected in a drain pan below, while the filtered solids remain on top of the filter belt. A series of special plows continuously turn, push, compress, and distribute the sludge across the width of the belt, allowing for optimal drainage of liquids. The thickened sludge is removed from the separator belts by a doctor blade mounted at the discharge end of the thickener. At this point, the sludge can be easily pumped to the next stage of de-watering or disposal. Cleaning of the gravity concentration belt is accomplished by belt washing stations containing a pipe with nozzles where pressurized water is sprayed through the filtering surface. A pneumatic system provides for tensioning and the automatic centering of the gravity belt thickener.

Gravity Belt Thickener Equipment

Gravity Table

To better accommodate specific customer needs, Compositech's gravity belt thickener equipment is designed to accept an optional cover for the filtration area. Other modifications can be made to meet the requirements of specific applications.

In addition to our own manufactured gravity tables, Compositech services and stocks replacement parts for gravity belt thickeners made by other manufacturers. Some of the items we stock:

  • Feed boxes
  • Bearings
  • Doctor blades
  • Plows
  • Belts
  • Mixers
  • Gaskets
  • Rollers

Compositech replacement parts are available for Andritz, Ashbrook, Komline-Sanderson®, Parkson, Sernatech/Sernagiotto, and various other gravity table manufacturers. Our replacement parts meet or exceed the quality and material of OEM components and are manufactured and warranted by Compositech. 

Contact us today to learn more about the replacement parts we keep in stock. 

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