HUBER Belt Thickener DrainBelt Belt thickener for highly efficient sludge thickening
- Very low polymer consumption
- High throughput capacity
- Reliable operation
The purpose of sewage sludge thickening
Sewage sludge, particularly secondary sludge, is characterised by low solids concentrations and therefore big volumes. Good sludge thickening is required as a prerequisite for the efficient further treatment of sewage sludge, for example in digesters, and is also necessary where liquid sewage sludge is transported to further treatment steps or utilisation.
The following criteria are decisive for the selection of the thickening process:
- Efficiency
- Performance
- Reliability
Design and Function
Polymer is added to the thin sludge and the sludge conditioned in a flocculation reactor prior to being distributed evenly over the full width of the continuously travelling filter belt.
The water filtered through the belt filter cloth drains off into collection troughs whilst the solids are retained on the filter belt.
Chicanes furrow the sludge to facilitate drainage and support the production of a concentrated sludge cake. The initial thin sludge volume is reduced by approx. 85 %.
The sludge cake is discharged into a collection trough from where it is removed by an eccentric screw pump for example. A spray bar cleans the filter belt while it travels back.
The benefits of the HUBER Belt Thickener DrainBelt
Efficiency
- Sludge volume reduction up to > 85%
- Typical thickening results > 6% DR
- Minimised polymer consumption, normally only 2 – 3 g effective substance/kg DM
- Low energy consumption
- Belt filter cleaning with filtrate water as spray water
Reliable technology
- Long filter cloth life due to the slow filter belt velocity of < 20 m/min
- Minimised wear of the plastic chicanes
- Encased thickener suitable for the treatment of strong-smelling sludge, protecting operators against harmful spray water aerosols
- Big inspection openings to facilitate maintenance
- Easy to operate and maintain
High performance
- Large active filter surface
- Very long thickening zone
- Increased filtration results through repeated sludge restacking
- Increased thickening results due to a ramp installed to decelerate the sludge prior to being discharged
- Selectable filter cloth options to meetspecific requirements
- High specific throughput capacity up to 45m3/h per metre of filter belt width
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