Carbon pre-treatment for the stabilization of pH in water...

Details Carbon pre-treatment for the stabilization of pH in water... Carbon pre-treatment for the stabilization of pH in water...

2007-05-29

2009-12-08

Savage, Matthew O (Department: 1797)

Liquid purification or separation

Processes

Ion exchange or selective sorption

C210S749000, C502S430000, C423S460000

Reexamination Certificate

active

07628923

ABSTRACT:
Treatment of un-wetted or low moisture activated carbon with a suitable quantity of carbon dioxide provides a material which, on contact with water, controls pH in treatment water. Use of this treated activated carbon in a water treatment system provides water having an essentially neutral pH which is immediately potable thereby eliminating the necessity to drain and dispose of any soak water. The contact pH of the treated carbon remains within the potable pH range for treatment of more than 100 bed volumes. Additionally, the modified carbon may minimize metal leaching from contaminants in the water.

REFERENCES:
patent: 4410472 (1983-10-01), Grubbs et al.
patent: 5876607 (1999-03-01), Farmer et al.
patent: 2002/0148784 (2002-10-01), Roodman et al.
Gu, et al., “Drying of an Activated Carbon Column after Steam Regeneration,” Chem. Eng. Technol. 22 (1999) 10, 859-864.
Encarta online dictionary definition of “Partition Coefficient” accessed Oct. 21, 2008.

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