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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). Similarly, energy-efficient heating solutions using heat pumps can be employed. 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). Similarly, energy-efficient heating solutions using heat pumps can be employed. Extensive mechanical dewatering of the sludge is necessary beforehand.

Solar sludge drying - fully automatic and reliable in operation

Solar Drying

Solar drying of sludge uses the energy of the sun as a thermal energy source. The basic principle is that the sludge is dried in a greenhouse structure with the help of a mechanical sludge turning device.

HUBER Belt Dryer BT - the flexible, fully automated medium temperature solution

Convective Drying

Belt dryers work with low and medium temperature and the sludge is convectively dried with hot air, whereby it can be simultaneously disinfected. The dried product achieves a solid concentration up to 95% DS.

HUBER Disc Dryer RotaDry®

Contact Drying

Disc dryers work according to the contact dryer principle: Designed for partial drying of dewatered sewage sludge, they are heated with saturated steam and used for medium to large sewage sludge volumes in combination with fluidized bed incineration.

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.

Convective Dryers 

The sludge is dried either with cold or with hot air in a belt dryer. The dried product has a solid concentration ranging from 70% DS up to 95% DS. HUBER cold air dryers are designed for small sewage treatment plants while the medium temperature belt dryer are most suitable for medium to large treatment plants.

Contact 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.

+44 1249 765000

sales@huber.co.uk

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