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KD10 Belt Press Hydraulic HY

The belt filter press KD10-1500 / - 2500 constitute a new generation of high-pressure belt filter presses constructed and produced by Danish Wasterwater Equipment A/S.

The presses are high-technology quality products designed for achieving a dry matter content as high as possible, even in sludge which is difficult to dewater.

The belt filter presses have been developed in a close cooperation between our engineers and municipal works managers. Thus, great importance has been attached to designing a reliable press featuring easy-to-clean properties.

Construction - Belt Filter Press

Danish Wastewater Equipment A/S Belt Filter Press Model KD 10 is constructed on a carrying base with a hot-galvanised steel frame.

The outlet/reject tray is located at the bottom of the frame construction allowing location of the press directly on the floor above the already embedded reject water pipe.

The press rollers are made of stainless steel. This applies to all components in direct contact with sludge or water.

All bearings are external standard bearings model SKF ensuring easy inspection and serviceability. All bearing housings have undergone epoxy surface treatment leading to a corrosion resistance corresponding to hot-galvanised steel.

Tightening and guide control of the belts take place automatically by means of hydraulics, and the belt features stepless speed control by means of frequency control. Belt control is by standard performed by a PLC and all operations are shown on a display. This also applies to alarms or errors, if any.

The hydraulic station and the control unit are completely separated from the wet part of the press and may be operated directly from the floor (no landing etc.).

The belt filter press is completely enclosed with rustproof doors equipped with inspection windows. Thus, ventilation may be supplied to the press.

Function Belt filter Press

The sludge dewatering takes place in three phases.

The gravitation zone

When polymer has been added to the sludge is led into the gravitation zone. The gravitation zone is constructed in such a way that the sludge is turned after the first tray and led out on a fresh new belt. If required, the gravitation zone may be supplied with cone paddles ensuring that the sludge is turned more frequently.

The belt filter press may be fitted with a highly effcient belt pre-dewatering unit of the same high standard design as the belt press. The belt speed may be adjusted by means of a frequency controlled motor. All monitoring functions may be integrated in the control cabinet of the belt press.

The pre-dewatering unit is typically fitted when the dry matter content of the sludge is below 2%.

If you would like further information on the pre-dewatering unit, model KD07, for instance capacity, you are very welcome to contact us.

The low-/ mean pressure zone

When sludge has passed the gravitation zone, it is pressed beween the two belts. The belts/ sludge is led around three big rollers with diameters of 600 mm, 400 mm and 273 mm repectively. The rollers with diameters of 600 mm and 400 mm are perforated allowing dewatering on both sides of the belts.

High-pressure zone

When the belts/sludge has passed the mean pressure zone, the sludge is now ready for the actual pressing, which takes place in the high-pressure zone.

The high-pressure zone consists of nine rollers with diameters of 168 mm.

All of these rollers are placed in a way to let the water, which drains through the belts, gravitate away from the belts.

This ensures that the sludge achieves the highest possible dry matter content.

Belt cleaning

When the sludge has been removed, the belt is led through a flushing device in which flushing nozzles ensure that the belt is cleaned.

As an extra feature, it is possible to have a high-pressure flushing device, model KD 20, fitted. This is particularly required for treatment plants where for instance iron chloride is used for precipitation. The high-pressure flushing may take place with closed doors making it possible to add chemicals without risk of noxious vapours for the personnel.

Maintenance/servicing - Belt Filter Press

One of the basic elements has been to construct a belt press featuring easy serviceability and requiring a low level of maintenance.

For that purpose, the press has been equipped with external bearings, which are all standard SKF bearings.

Bearings, chain, as well as sprocket wheels may be fitted with an automatic lubrication device model SKF 24H ensuring that the press may operate up to one year without further lubrication. The gear drive has been supplied with synthetic oil ensuring operation for four years before change.

The flushing bars are easy to remove for inspection and cleaning. All nozzles are fitted with click-on devices making it possible to replace them in minutes without any use of tools.

Scrapers may be tipped, thus facilitating cleaning/inspection.


The belt press features the required emergency stop switches and for extra safety, the press has been equipped with two wire emergency switches which may be activated if is necessary to leave the doors open during operation.

The working environment

The belt press meets the requirements of the danish working enviroment service for safety at work. The belt press has also achieved CE-labelling according to the EU machine directive.

Sludge dewatering

Sludge dewatering undoubtedly gives rise to many questions; how to dewater and which dewatering type to choose: A belt filter press, a decanter, a chamber filter press or another dewatering type?

Irrespective of which type you choose, there will always be advantages and disadvantages. However, the following facts may influence your choice of dewatering type:

Belt filter press:
+ Low energy consumption
+ Low polymer consumption
+ Low noise level
+ Low SS contents in reject water
+ Visual observation of dewatering process
+ Inexpensive service (can be performed locally)
- Achieves lower dry solids in dewatered sludge

+ Space-saving
+ Compact machine
+ High dry solids contents in dewatered sludge (requires high pressure decanter)
- High energy consumption
- High polymer consumption
- High noise level
- Actual dewatering process cannot be observed
- Expensive wearing parts/service cannot be performed locally (requires special equipment and service manpower)

Chamber filter press:
+ Good dry solids amounts in dewatered sludge
- Batch dewatering
- Very space consuming

One single supplier

Using Danish Wastewater Equipment as your supplier will provide you with obvious advantages. DWE is able to perform design and planning, manufacturing, servicing as well as running-in of the complete plant.

We are at your disposal during the design phase or in connection with exchange of existing equipment with advice about space requirements, outlet, etc.

We manufacture the machines ourselves which means that we are familiar with every detail and are therefore able to guarantee optimum equipment.

We install and perform equipment running-in, thereby achieving the necessary sparring between customer and supplier. Furthermore, this ensures knowledge about operation, polymer type, etc.

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Technical specification

Aerobic activated sludge:
  • Dry matter: 2 – 4 %
  • Sludge load: 300 – 900 kg/h
  • Dry matter in filter cake: 18 – 26 %

  • Digested primary sludge:
  • Dry matter: 4 – 6 %
  • Sludge load: 600 – 1200 kg/h
  • Dry matter in filter cake: 32 – 38 %
  • Capacity: 13 – 31 m3/h
  • Component


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