Municipal & Industrial
Thermal Treatment

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. 

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.

Municipal & Industrial Thermal Treatment

Thermal Hydrolysis
process

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

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

• Odor Control

  Haarslev offers a range of technologies for VOC and odor treatment to accommodate specific customer requirements.

• Regenerative oxidizer

  This type of thermal oxidizer is suitable for high effluent flow rates with low energy consumption.

• Chemical scrubbers

  Designed in either single or multiple stage systems utilizing reagents to effectively reduce the emissions of VOC’s.

• Air washer/Humidifier

  The air washer/humidifier will partly humidify the air and partly wash it free from impurities like dust and fat

• Biofilters

  Haarslev Biofilter is an economic and environmentally friendly way to remove odor from waste gases. They are an environmental friendly alternative to scrubbers and oxidizers.