The SEVAR Belt Dryer

Der SEVAR Bandtrockner
SEVAR Belt Dryer

The SEVAR Belt Dryer is a direct or indirect fired, double pass belt dryer. Feed material can be dryed at a min. DS content of appr. 15 % dry solids. The desired product DS content can be adjusted between 45 - 95 % DS. The sludge is extruded into sludge strands and drops down onto the top belt of the dryer in a uniform pile. Granulating the material into a wormlike shape, increases the surface area of the material available to heat and mass transfer. The dry air is recirculated inside the dryer and evaporates the water from the wet product. The humidified, cool air is finally extracted from the dryer and again recirculated in most applications.

Advantages of a Belt Dryer

Optimum drying
by a process specially developed for drying sewage sludge

Minimal dust generation
due to slow movement of the product inside the dryer

Intensive water evaporation
enlarged product surface by forming the sludge into granulates

Low maintenance expenses
due to simple, easy accessible design and slow moving parts

Low vapour condensate load
due to low drying temperature (120 - 140°C)

Pasteurisation of product
retention time of approximately 45 to 60 minutes and product temperatures >75 °C

High degree of flexibility
use of various energy sources:
natural gas, fuel oil, vapour, hot water, thermal oil, low pressure steam
waste heat: exhaust gas and cooling water of gas motors
by direct and indirect heating


Final dry solids content easyly adjustable
with a  final dry solids content of 40 to 90%, the dry product can be utilized directly in agriculture, composted, landfilled or incinerated

Odour control
by a negative pressure in the drier, high recycling and treatment of the drying gas