Process and apparatus for removal of ash from waste water...

Details Process and apparatus for removal of ash from waste water... Process and apparatus for removal of ash from waste water...

C - Chemistry, Metallurgy

02

F

252/25, 182/9

C02F 1/00 (2006.01) C01B 31/08 (2006.01) C02F 1/28 (2006.01) C02F 11/08 (2006.01)

Patent

CA 1073365

ABSTRACT OF THE DISCLOSURE A process and apparatus for use with an overall waste water treatment system using powdered activated carbon and re- generated carbon for separating and removing ash from the powdered carbon. An influent is purified by carbon with a subsequent settling step producing a clear purified product water. Underflow solids are recycled back to the influent maintaining a high carbon con- centration in the water carbon contact zone. Spent carbon is taken out of the system as a small side stream and pressurized, heated, and passed through a reactor where the carbon is re- generated and then the heavier ash is concentrated and removed. The invention is applicable to carbon used in any part of a waste water treatment system, not only in aeration operations but also in the absence of oxygen or air (anaerobic) including denitrifi- cation systems.

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