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The disposal of sewage sludge is one of the biggest challenges in municipal and industrial wastewater treatment. With a HARTER sewage sludge drying system, you significantly reduce sludge volume, lower transport and disposal costs, and simultaneously meet environmental regulations.
The innovative heat pump drying operates exhaust-free, hygienically, and extremely energy-efficiently – ideal for municipal wastewater treatment plants, industrial, and chemical facilities.
How HARTER develops individual solutions for every requirement is shown in: How Solutions for Heat Pump Dryers are Created.
An overview of the technology can be found in: Energy-Saving Drying with Heat Pumps.
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!
Drying systems
in over 20 countries stand for our quality
Employees
from all areas ensure a high level of vertical integration
Years of experience
in the development of innovative drying systems
Sewage Sludge Drying System – Operating Principle and Process Advantages
After mechanical dewatering, sewage sludge often still contains 60–80% water. Only through targeted thermal drying does the sludge become transportable, storage-stable, and significantly easier to dispose of or thermally recover.
The HARTER heat pump drying operates in a closed air circuit:
The air is dehumidified, heated, and recirculated over the material – completely without exhaust air losses. The system reuses the energy recovered in the heat pump multiple times, drastically reducing electricity consumption.
Your advantages at a glance:
- Up to 70% less energy consumption than with hot air processes
- Exhaust-free, low-odor operation
- Uniform residual moisture levels at low temperatures (30–75 °C)
- low-maintenance, durable technology
- Stable process control independent of ambient air
How HARTER modularly expands systems and designs them for higher throughputs is shown in: Expanding Capacities with Heat Pump Dryers.
Sewage Sludge Drying Systems
Sewage Sludge Drying System – Applications, Designs, and Integration
The HARTER sewage sludge drying systems are suitable for both municipal and industrial applications. Whether for municipal wastewater treatment plants, chemical plants, paper mills, or electroplating facilities – HARTER delivers customized systems for every requirement.
Typical Application Areas:
- Municipal and industrial wastewater treatment plants
- Sludges from the chemical, food, or pharmaceutical industries
- Electroplating and metal hydroxide sludges
- Mixed sludges from industrial processes
System Types:
- Batch and Tray Dryers for batch processes
- Belt and Tunnel Dryers for continuous throughputs
- Special Systems with customer-specific air guidance and automation
The drying temperature is precisely adapted to the material. Due to the exhaust-free design, neither odors nor pollutant emissions are generated – a major advantage for densely built-up locations or indoor operation.
In its in-house technical center, HARTER tests original sludges under real conditions. Air guidance, temperature, humidity, and residual water content are analyzed. These data form the basis for a validated, operationally reliable series system.
We dry with dry air and deliver it to the right places: A perfect interplay of air preparation and air guidance provides you with the best possible drying result.
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.
Sewage Sludge Drying System – Sustainability, Economic Efficiency, and Environmental Footprint
HARTER’s heat pump technology is not only efficient but also makes a significant contribution to resource conservation. Thanks to the closed air circuit and heat recovery, almost all energy remains within the system.
Sustainable advantages:
- Low CO₂ emissions due to high energy efficiency
- No combustion or exhaust air emissions
- Reduction of disposal volume by up to 70%
- Short payback periods due to low operating costs
- Eligible technology (e.g., BAFA, EU programs)
Many HARTER customers combine drying with heat recovery or photovoltaics. This further increases energy self-sufficiency and climate neutrality. Find more about related applications on Industries.
What our customers say
“Sometimes it is better to say nothing and let your customers speak for themselves.”
– Regina Mader, Managing Director
FAQ – Frequently Asked Questions about Sewage Sludge Drying Systems
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Brochures, technical reports, and press articles for those who want to know more details.
