Belt Presses

Belt Filter Presses have been used for industrial wastewater treatment plant sludge dewatering for decades. Although today, most industries adopt screw presses for in house sludge dewatering due to many benefits, in certain instances, traditional belt press technology can prevail.

One of the primary advantages of a belt presses is the ability to handle very high volumes of sludge and it is suitable for primary sludge from a DAF system or clarifier, secondary biological sludge or a combination of both.

The belt press works by introducing flocculated sludge into a gravity zone where free water is allowed to drain thus reducing the volume of slurry to be dewatered. This thickened slurry is then squeezed between 2 belts under high pressure to produce a spadable cake.

In industrial applications, a belt filter press will generally dewater primary DAF sludge to between 20-30% and up to 15% DS for Waste Activated Sludge

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How the Belt Presses Works
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The first stage of dewatering in a belt press is chemical conditioning. This is usually achieved by dosing a polymer into a flocculation zone upstream of the belt press. The flocculant will bind the sludge particles into larger flocs which are thicker and easier to dewater in the press.

The conditioned sludge is then transferred onto the gravity drainage section of the press which allows free water to drain through the belt thus considerably reducing the volume of sludge to be dewatered.

After the gravity drainage stage the slurry is transferred into the dewatering zone where it passes between conveyor belt driven sets of rollers that apply shearing to the slurry. The dewatering zone combines low and high pressure sections to ensure as much water as possible is squeezed out of the slurry and the resulting cake is in a spadable form.

The resulting sludge cake is removed from the belts using mechanical scraper blades prior to being discharged into a storage bin or conveying system.

The Hydroflux belt press is available with belt widths ranging from 500mm to 2500mm. The capacity of a belt press is based on a combination of hydraulic and solids loads
Model Number Max Hydraulic flow (m3/h)* Max solids load (kg/h)
HY-PRESS 500 1-4 80-100
HY-PRESS 1000 4-8 160-200
HY-PRESS 1500 6-12 240-300
HY-PRESS 2000 8-16 320-400
HY-PRESS 2500 16-25 400-500

*typical capacities, consult Hydroflux Industrial for specific data

The Hydroflux Belt Press offers several advantages over other dewatering systems:


  • Operational requirements are relatively low
  • Maintenance is relatively simple and can usually be undertaken by a non- specialised maintenance team
  • Start up and shut down is quick and simple
  • Noise levels are low
A Belt Press can be used for dewatering primary or biological sludge from virtually any industrial applicaiton including:
  • Meat Industry
  • Poultry Industry
  • Breweries & Wineries
  • Juice Plants
  • General Industry
  • Heavy Hndustry
  • Pulp & Paper
  • Vegetable Industry

Engaging a professional wastewater treatment company to look after the entire wastewater project is a convenient, economical and hassle free option for industry.

Hydroflux Industrial can provide all process design works, manufacture and fabrication, construction and even complete operation of your wastewater treatment plant.

When Hydroflux Industrial provides complete solutions, we can either undertake a contract on a turnkey basis or work together with building services engineers and other construction professionals to ensure that the project is delivered smoothly, without interruption and on time.


The Hydroflux Group is able to offer a Build Operate & Transfer (BOT) option for water and wastewater assets in Australia and New Zealand. This innovative partnership arrangement strengthens existing strong bonds between Hydroflux and their customers for the long term.

Hydroflux, represented by a special purpose vehicle dedicated to the project, supplies the design, construction, financing, and operation of the water or wastewater plant. The plant is transferred to the client at the end of the contract, which is generally around 10 years.

Hydroflux also purchase existing water and wastewater plants on a similar basis, which releases cash to our clients for either returning or distributing to investors or for funding other investments in their core business.

The multidisciplinary structure of the Hydroflux group including design, construction, equipment supply and operation makes Hydroflux the ideal BOT water and wastewater partner.

Please contact Hydroflux if would like to explore the option of either acquiring a new water or wastewater facility without capital outlay or would like to free up cash by selling your existing water or wastewater assets.