METHOD AND PLANT FOR THICKENING SLUDGE DERIVED FROM WATER TREATMENT BY FLOCCULATION-DECANTATION WITH BALLASTED FLOC

The invention concerns a method for thickening sludge derived from a water treatment plant by flocculation- decantation with floc ballasted with micro-sand or other dense granular material using a liquid cyclone treatment (1) of the decantation sludge. The invention is characterised in that it compr...

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Bibliographic Details
Main Author BINOT PATRICK
Format Patent
LanguageEnglish
Published 18.08.2008
Subjects
CHEMISTRY
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Summary:The invention concerns a method for thickening sludge derived from a water treatment plant by flocculation- decantation with floc ballasted with micro-sand or other dense granular material using a liquid cyclone treatment (1) of the decantation sludge. The invention is characterised in that it comprises successive steps which consist in: degassing (3) the overflow sludge of the liquid cyclone treatment (1) from the ballasted flocculation-decantation unit, said degassing step being carried out on a corresponding degassing surface at a degassing surface velocity of less than 100 mph; injecting at least a flocculating reagent (4) into said sludge; and thickening said sludge in at least a laminar sludge thickener (6), with a stilling floor load calculated at the thickener floor surface higher than 200 kg of suspended matter per m^2 per day and the extracted sludge concentration higher than 10 g/l.
Bibliography:Application Number: KR20087016302