Belt dryer for sludge

Energy-efficient drying for industrial and sewage sludge

  • Up to 45% subsidized acquisition costs

  • Save up to 75% energy costs

  • 100% planning reliability thanks to premium after-sales service

Continuous belt drying of sludge

Our belt dryers for all types of sludge are modular solutions. We have developed a special module that can be combined in series with other modules. This gives you a drying system in the size and performance range that is right for you.

Do you have individual requirements that you would like us to test in advance?

From concept to custom solution
Practical tests in our in-house laboratory

For challenging applications, HARTER develops tailor-made custom solutions. In our technical center, we test your product under realistic conditions, define temperature and humidity windows, optimize cycle times, and document the results. Contact us – we will review your task without obligation and provide a clear recommendation for the next steps.

Contact our experts now +49 8383 9223‑210 or submit the contact form
2000

Drying systems

in over 20 countries stand for our quality

100

Employees

from all areas ensure a high level of vertical integration

+ 35

Years of experience

in the development of innovative drying systems

Your benefits

Drymex Modules Water extraction capacity
kg/24h		 Belt width Belt length
per module
B500 630 500 mm 2,000 mm
B1.000 1,270 1,000 mm 2,000 mm
B1.500 1,900 1,500 mm 2,000 mm
B2.000 2,540 2,000 mm 2,000 mm

Housing design:

  • Frame housing made of stainless steel (1.4301), side walls made of stainless steel panels (1.4301), double-walled insulated
  • PP plastic belt freely selectable
  • Waste heat dissipation via plate heat exchanger (water) or additional condenser (air)
  • Hinged doors for filter changes, deflection unit on the infeed and discharge unit, and dirt tray access
  • A maximum of 10 modules can be strung together

Product entry design:

  • Paddle mechanism (made of stainless steel 1.4301) presses the sludge through a special perforated plate
  • Positive displacement pump presses the sludge through a die
  • Shredder to shred material, e.g. after the Weima press
  • All different application units are frequency controlled (this regulates the layer height on the belt)

Drymex® basically works in a closed air system. Openings at the inlet and outlet of the belt dryer are unavoidable due to the process, but are kept as small as possible and taken into account during the technical design.

External climate influences therefore have hardly any effect on temperature and humidity. This ensures constant drying quality, plannable cycle times and high process reliability – all year round.

Selected belt materials and designs of the B-Line ensure that sludge does not stick and is well ventilated. The dry process air flows evenly through the sludge, quickly absorbs moisture and reduces drying times with low-dust, stable results.

Our B-Line drying modules require a feed of the sludge into the hopper above the first module, as well as a discharge of the dried sludge.

Do you already have a conveyor system that can be integrated into our technology? Or do you need a completely new system with infeed and discharge? In a discussion, we will find out what the optimal solution looks like for you.

Heat pump-based dehumidification with heat recovery significantly reduces energy consumption. Compared to conventional processes, you reduce operating costs and CO₂ emissions – with consistently high product quality.

Drymex® B-Line dryers have a PLC control system that allows you to control the functions of your system. Individual settings for humidity, temperature, belt speed and volume flows ensure the perfect process sequence and a convincing drying result. Drying programs run automatically and independently – for reproducible quality and minimal supervision.

The high-quality mechanical design of the B-Line in stainless steel 1.4301 ensures a long service life, even in aggressive environments. The heat exchangers and refrigeration technology of the B-Line are specially designed for corrosive conditions and ensure high value retention and a stable process. Sophisticated conveyor technology with deliberately selected materials guarantees safe and low-maintenance operation.

The B-Line drying modules include drying belt and heat pump technology in one and can therefore be expanded modularly in order to process the correspondingly required throughput quantity. Each module has a length of 2,000 mm and can be designed in different belt widths according to the size.
A total of up to 10 modules can be strung together (drying section 20m).

In addition to the belt drying modules of the Drymex® B-Line, HARTER offers compact container solutions for smaller sludge quantities up to 1.5t / day (see M-Line). For customized or larger batch dryers, please inquire about the S-Line.

The Process

The Drymex® heat pump module of our sludge dryers provides the required process air and is also responsible for the condensation process: We work with extremely dry and therefore unsaturated air and guide it homogeneously through the sludge. This combination of efficient air treatment and appropriate air flow ensures a high-quality drying result.

Interface Drymex® heat pump module / drying container: humid air is extracted from the drying chamber and fed to the dehumidification unit.

Moisture condenses on the fins of the air cooler and drains out of the drying system via the drip tray and condensate drain.

The air heater warms the air to the required process temperature.

The process air fan ensures the necessary air exchange between the Drymex® heat pump module and the drying chamber.

Now, the dry, unsaturated air is guided into the drying chamber. This closes the circuit.

Efficiency that pays off.

Our HARTER drying systems save up to 75% CO₂ and are up to 45% governmentally funded.

Reliable – Competent – Long-term

Service that thinks ahead – for years to come

With the HARTER After-Sales Service, you secure a reliable and efficient drying solution for the long term. Whether it’s maintenance, spare parts supply, or technical adjustments – we support your system throughout its entire life cycle and ensure that it delivers optimal results at all times.

Performance Service

Optimal performance through our “all-round carefree package”

Custom Service

Flexible for changing requirements

Expert Service

Fast assistance in case of failure

Lifetime Service

So that the quality is always right

What our customers say

Not convinced yet? Our customers are thrilled!

“Sometimes it is better to say nothing and let your customers speak for themselves.”
– Regina Mader, Managing Director

“For several decades, we have been using a sludge dryer from Harter in our electroplating shop and are very satisfied with it. The technology and service are reliable and have helped us save a lot of money on disposal.”

Daniel Hutter
Verzinkerei Kriessern AG

“BK Giulini GmbH has been working successfully with Harter GmbH for around 20 years. We are very satisfied with both the dryer technology and the reliability of the complete system. Based on these positive experiences and the very good service, we invested in another drying system of this type in 2023.”

Dimitri Baumbach
ICL Ladenburg / BK Giulini GmbH (ICL Group)

“In our waste incineration plant, we have saved an enormous amount of money by drying our heavy metal-containing hydroxide sludge. The system technology is sustainable and easy to maintain. In retrospect, the investment was a very good decision.”

Stefan Ringmann
KVA Linth
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