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Sludge Drying

Cost reduction on sludge transportation and disposal costs.

Efficient solutions to minimise the volume of sludge for disposal

Wastewater sludge is dried to minimise its mass and to save sludge transport and disposal costs. Handling and storage of dried sludge is cost effective, and any further disposal and utilisation methods are possible. The dried product can be used as fertiliser, as well as fuel – the calorific value of fully dried sludge is similar to that of brown coal.

Thermal energy from different energy sources

Thermal drying involves the evaporation or vaporisation of capillary water, surface water and cellular water, which requires thermal energy. Typical energy sources are the sun (solar drying) as well as site-specific waste heat (e.g. from a combined heat and power plant) or excess steam from power generation (exhaust steam from a turbine). Extensive mechanical dewatering of the sludge is necessary beforehand.

Save sludge hauling and disposal costs by drying sewage sludge
Efficient solutions to minimise the volume of sludge for disposal

Wastewater sludge is dried to minimise its mass and to save sludge transport and disposal costs. Handling and storage of dried sludge is cost effective, and any further disposal and utilisation methods are possible. The dried product can be used as fertiliser, as well as fuel – the calorific value of fully dried sludge is similar to that of brown coal.

Thermal energy from different energy sources

Thermal drying involves the evaporation or vaporisation of capillary water, surface water and cellular water, which requires thermal energy. Typical energy sources are the sun (solar drying) as well as site-specific waste heat (e.g. from a combined heat and power plant) or excess steam from power generation (exhaust steam from a turbine). Extensive mechanical dewatering of the sludge is necessary beforehand.

The right drying process for every application

We supply three different kinds of HUBER sludge drying systems, which differ greatly in terms of space requirements, temperature level and heating medium.

Solar Sludge Dryers

In a greenhouse where a mechanical sludge turner is installed, the sludge is dried to a solids content of usually 65% DS. HUBER solar dryers are used on small and medium-sized wastewater treatment plants as well as on very large plants.

Medium-Temperature Belt Dryers 

The sludge is dried with hot air (70° up to 150° Celsius) in the belt dryer. The dried product has a solids concentration ranging from 70% DS up to 95% DS. HUBER belt dryers are used on medium to very large sewage treatment plants.

Disc Dryers

The disc dryer is a contact dryer designed for the partial drying of dewatered sewage sludge to 40 – 45% DR and is heated with saturated steam up to max. 10 bar(a). HUBER disc dryers are often used in combination with fluidized bed incinerators for medium to large and very large volumes of sewage sludge.

Contact

If you have any questions, please do not hesitate to contact us!

We welcome your enquiries and want to offer you the best possible support for your projects.

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