Method and plant for thickening sludge derived from water treatment by flocculation-decantation with ballasted floc
First Claim
1. A plant for thickening sludge derived from water treatment comprising at least one wastewater or water treatment unit including a ballasted flocculation zone with floc ballasted with sand or other granular material, a settling zone for separating settled sludge, a recirculating line for circulating settled sludge from the settling zone to a separator that separates the settled sludge into ballast and sludge, a line from the separator to a sludge thickening system for directing sludge from said separator to degassing zone having a minimum surface corresponding to a degassing speed of 100 m/hr relative to the flow rate of said sludge;
- a thickening system flocculation zone adapted to enable at least one flocculation agent to be mixed with the sludge to be thickened;
at least one sludge thickener settler forming a part of a lamellar sludge thickening system and including a lamellar decantation zone including a series of plates, a thickening zone disposed under the plates, an extraction device associated with the thickener settler for extracting thickened sludge, and a clarified water zone above the plates.
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Accused Products
Abstract
A method is provided for thickening sludge produced through a ballasted flocculation process. The sludge and granular material from the ballasted flocculation process are directed to a sludge separator where the sludge is separated from the granular material. Thereafter the separated sludge is sent to a degassing area and the sludge is degassed. A flocculating agent is mixed or injected into the sludge. The sludge is directed to a sludge thickener with a load at a sill calculated on the surface of the thickener greater than 200 kgMIS/m2/day. This process produces a thickened sludge having a concentration greater than 10 gm/l.
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Citations
8 Claims
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1. A plant for thickening sludge derived from water treatment comprising at least one wastewater or water treatment unit including a ballasted flocculation zone with floc ballasted with sand or other granular material, a settling zone for separating settled sludge, a recirculating line for circulating settled sludge from the settling zone to a separator that separates the settled sludge into ballast and sludge, a line from the separator to a sludge thickening system for directing sludge from said separator to degassing zone having a minimum surface corresponding to a degassing speed of 100 m/hr relative to the flow rate of said sludge;
- a thickening system flocculation zone adapted to enable at least one flocculation agent to be mixed with the sludge to be thickened;
at least one sludge thickener settler forming a part of a lamellar sludge thickening system and including a lamellar decantation zone including a series of plates, a thickening zone disposed under the plates, an extraction device associated with the thickener settler for extracting thickened sludge, and a clarified water zone above the plates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a thickening system flocculation zone adapted to enable at least one flocculation agent to be mixed with the sludge to be thickened;
Specification