CARBON PRE-TREATMENT FOR THE STABILIZATION OF pH IN WATER TREATMENT
AssigneeCalgon Carbon Corporation
InventorsThomas Anthony Ryan, Harry Sharrock
Life of this patent
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Abstract
Treatment of n-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
Claims20
A method for treating water to control excessive pH in the treated water, said method comprising:
- a. preparing a bed of dry activated carbon,
- b. loading said activated carbon with carbon dioxide to about 0.1 to 2% by weight of said carbon, and
- c. contacting said water with said loaded carbon dioxide for an appropriate amount of time.
A modified carbon for treating water to control pH in the treated water, said modified carbon comprising a dry activated carbon containing carbon dioxide in the amount of about 0.1 to 0.8% by weight of said carbon.
A method for preparing a carbon composition for treating water to control excessive pH in the treated water, said method comprising:
- loading a first carbon with carbon dioxide to about 0.1 to 1% by weight of said carbon, and adding said loaded first carbon to a second carbon, wherein said second carbon has a moisture level below about 15%.
Dependencies are inferred from the claim text.