Gravity Belt thickener
Gravity Belt Thickener
The gravity belt thickener OMEGA (GBT) has been developed for continuous thickening of primary urban or industrial sludge (5-30 g/l).It allows obtaining a high concentration between 6 and 10 % with a capture rate higher or equal to 96 % with low polymer consumption.
The sludge is processed in three distinct stages :
Floculation,
Gravity drainage
Pressing
The process begins by first conditioning the sludge. The important first step is required to agglomerate the suspended sludge solids into « flocs » and thus provide an initial separation of sludge solids from the liquid. This stage consistsin injecting polymer in the sludge. Normally, the floculant is injected upstream the sludge pump to benefit from a progressive mixing by the eccentric screw of the pump. Conditioning is also designed to build a « structure » into the sludge floc so that they can withstand gradually increasing pressure and shearing action. In general, a BFP cannot function without polymer conditioning.
Then floculated sludge spreads over the filtering belt using a distribution tube in Upvc : free water created during sludge conditioning drains through the belt pores. The importance of proper sludge conditioning in BFP dewatering can be readily observed at this point. Without conditioning, liquid sludge will simply pond in the gravity drainage section or run out the edges of the belt. When the two filtering belts converge, pressing and shearing stage begin. The first roller has an important diameter (∅400) in order to
get a progressive pressing. Pressing and shearing operate all along the belt length thanks to 9 rollers with a diameter of 200, which enable to get a progressive pressing of the sludge.Therefore sludge dewatering is maximal and the capture rate is optimal. After the last pressing stage, the dewatered sludge scraped from the filtering belts, and then evacuated on a mesh conveyor or other system. To enable the filtering belts to keep their filtration capacity, they are washed continuously on the travel back to the thickening zone.
Sludge thickening – Gravity Belt Thickeners
OMEGA SD range
Designed for continuous mechanical thickening of municipal or industrial sludge
- Continuous thickening
- Belt width : from 0,50 to 2,50 m
- Filtration length : 2 m
- Sludge flowrate: up to 40 m3/h
- Very clean operation
- Easy maintenance and supervision
- Low energy consumption and operating costs
- Material : stainless steel 304L, 316L or other
OMEGA MD range
Designed for continuous mechanical thickening of municipal or industrial sludge
- Continuous thickening
- Belt width : from 1 to 3 m
- Filtration length : 3 m
- Sludge flowrate : up to 80 m3/h
- Very clean operation
- Easy maintenance and supervision
- Low energy consumption and operating costs
- Material : stainless steel 304L, 316L or other
OMEGA LD range
Designed for continuous mechanical thickening of municipal or industrial sludge
- Continuous thickening
- Belt width : from 1 to 3 m
- Filtration length : 4m
- Sludge flowrate: up to 100 m3/h
- Very clean operation
- Easy maintenance and supervision
- Low energy consumption and operating costs
- Material : stainless steel 304L, 316L or other
OMEGA THC range
Designed for continuous mechanical thickening of municipal or industrial sludge. Especially aimed to very high capacity installations.
- Continuous thickening
- Belt width : from 1 to 3 m
- Filtration length : 5m
- Sludge flowrate : up to 200 m3/h
- Very clean operation
- Quick and easy supervision
- Low energy consumption and operating cost
- Material : stainless steel 304L, 316L or other