Sewage sludge drying

  • Up to 45% subsidized acquisition costs
  • Save up to 75% on energy costs

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

If you not only dewater your sludge but also dry it afterwards, you can save up to 70 percent of your disposal costs. With the help of our Drymex® sewage sludge drying system, you can reduce the weight and volume of your sludge by an ideal 70 percent. Many new avenues open up with dried sludge. For one, our sewage sludge dryers may help you meet existing or future legal requirements.

Due to the higher calorific value, you can dispose of dried sludge more cheaply. Sewage sludge drying with a heat pump is extremely economical in terms of energy and CO2. This allows you to meet your requirements in both financial and ecological terms.

Efficient sewage sludge drying

Our Drymex® sewage sludge dryers are suitable for pre-dewatered water-containing sludges and substrates. For sewage sludge from centrifuges and screw presses, continuous belt drying is ideal. If you have a chamber filter press in use, batch solutions are also possible.

Do you require a custom solution and/or would you like to test the drying process beforehand?

Development with practical tests in our in-house development center

We are an innovation-driven team and welcome new challenges. HARTER tests your custom solution in the technical center under realistic conditions, optimizes the parameters, and documents the results transparently. Please contact us – we would be pleased to provide you with a non-binding consultation!

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

Most of the money for disposal is simply spent on water. By using our sewage sludge drying system with a heat pump, you reduce the weight and volume of your sludge by up to 70 percent. This also means a reduction in your disposal costs by up to 70 percent.

Air dehumidification is possible here in the low-temperature range. Drymex® sewage sludge dryers operate in a defined temperature range between 30 and 60 °C.

We would be happy to test the properties of your sludge in our technical center. Get an idea of the efficiency of our technology for your product!

The heat pump technology integrated in all our dryers is inherently efficient and ecologically sound. Our belt dryers require a maximum of only 0.4 kWh per liter of water extracted.

Our sewage sludge drying system operates in an air-technically closed system and is therefore completely independent of climatic and weather influences. Only at the inlet and outlet openings of the belt dryer is there a minimal air exchange, which must be taken into account during planning. The closed circuit also increases the energy efficiency of the process.

The perfect interplay of extremely dry air and the correct air flow ensures that sewage sludge drying is efficient, safe, exhaust-free and homogeneous.

You receive first-class and reliable system technology from us, which pays for itself within a very short time due to the high cost savings in sludge disposal.

Drying systems for sewage sludge

An answer to all concerns

Our belt dryers for sewage sludge are modular solutions. We have developed a special module that can be combined in series with up to 10 modules. This gives you a sewage sludge dryer in the right size for you – also as a mobile solution.

Order of magnitude

Our single module dries approximately 100 kg of sewage sludge per hour. It can be expanded to up to 1,000 kg/h. The current upper limit is “per system” 140,000 population equivalents.

Conveyor technology

Our sewage sludge drying system requires the sludge to be fed into the hopper above the module and the dried sludge to be discharged. Do you already have a conveying system that can be integrated into our technology? Or do you need a new conveying technology? In a discussion, we will find out what the optimal solution for you can look like.

Is your application different?

You will certainly understand that we cannot show all our diverse possibilities here. If you have not found your application here, please contact us directly. We would be happy to advise you without obligation!

The Process

The Drymex® heat pump module of our sludge dryers provides the necessary process air and is also responsible for the condensation process. We work with extremely dry and thus unsaturated air, guiding it homogeneously through the sludge. This combination of efficient air preparation and appropriate air guidance 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’s better to say nothing and let your customers speak for themselves.”
– Regina Mader, Managing Director

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

Daniel Hutter
Verzinkerei Kriessern AG

“BK Giulini GmbH has been successfully collaborating with Harter GmbH for approximately 20 years. We are very satisfied with both the dryer technology and the reliability of the entire system. Based on these positive experiences and the excellent 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 a significant amount of money by drying our heavy metal-containing hydroxide sludge. The plant technology is sustainable and maintenance-friendly. In retrospect, the investment was a very good decision.”

Stefan Ringmann
KVA Linth
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