Municipal & Industrial
Thermal Treatment

Haarslev’s expertise in drying and hydrolysis of sludge from waste-water treatment plants derives from the delivery of more than a hundred drying plants over the last 30 years.

We focus on equipment for environmental protection, energy conservation and optimal resource utilization.

We supply both single machines and complete plants designed to meet individual customer requirements.

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Municipal & Industrial Thermal Treatment

Partial Drying
of Sludge

Drying of sludge to 30-45% DS provide for an optimal energy balance in incineration plants.

For any fuel, the content of water acts as an inhibitor in the incineration process. Thermal drying is one of the technologies available for removing some of the water content in municipal wastewater treatment plants to obtain an optimal energy utilization before incineration. Municipal sludge is typically liquid containing 2 to 6 per cent solids prior to mechanical dewatering. 

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Municipal & Industrial Thermal Treatment

Full Drying
of Sludge

Drying of sludge to 90-95% DS. Ideal for manufacturing of fertiliser supplement, soil conditioner or fuel.

Thermal sludge drying is a process where the dewatered sludge from a wastewater treatment plant is dried using external heat to produce a Class A sludge. The dried product is a sterile granular bio solid with 90-95% solids content. The dried product can be used as a fertilizer supplement, soil conditioner or a sustainable fuel.

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Municipal & Industrial Thermal Treatment

Thermal Hydrolysis

Haarslev offers two versions of thermal hydrolysis systems and 5 plant sizes according to the sludge amount to be thermally treated.

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Municipal & Industrial Thermal Treatment

Heat Recovery
and Odor control

Drying of sludge using a disc dryer produces an excess of thermal energy, which can be recovered with up to 80 % and reused for various purposes.

The energy for sludge drying is transferred during the drying process from the heat source (live steam, thermal oil or pressurized hot water) to the vapors emitted from the dryer. This heat can be recovered to a large extent due to the high temperature level and the low amount of false air which characterizes the disc drying system.

Preheating of wet sludge prior to mechanical dewatering results in a higher degree of dewatering and a reduced consumption of flocculation agent. The preheating of raw sludge also saves energy input to the digester.

The surplus of energy can alternatively be used for district heating if the wastewater treatment system is placed near consumers such as cities, large industrial areas, hospitals etc.

Available processes

Process is

Haarslev Global Services makes sure your business keeps on going

Downtime is the worst for all companies. You just have to avoid it at all costs. Our systems have been designed to ensure maximum uptime.
Haarslev Global Services department helps keep your plant running reliably, efficiently and profitably every day of the year.

Highly trained experts are available to give you the best advice when it comes to mastering your processes and by implementing the right procedures for maintenance and spare parts stock, you will be able to:

  • guarantee your throughput
  • obtain more yield per product
  • achieve a reduced Total Cost of Ownership (TCO)
Harald Petersen
Mechanical Engineer