Water treatment method for reducing levels of Cr+6
AssigneeA/S
InventorWilliam E. Stapp
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Abstract
A treatment effective for removing or substantially reducing the amount of Cr+6 present in drinking water or wastewater is described. The method includes adding a stannous salt of a non-carbon acid, in an amount effective to reduce most or substantially all of the chromic ion in the water.
Claims15
In a water treatment method that includes the steps of obtaining water at a wellhead, transporting the water to a water-treatment plant, and treating the water at the plant with an oxidant, a method for removing or substantially reducing the amount of oxidized chromium ion present in water supplied from the plant as drinking water, comprising:
- adding to water, prior to exposing the water to said oxidant, an amount of a stannous salt of an inorganic acid effective to reduce a substantial portion of any Cr+6 present to a lower oxidation state.
A method of treating wastewater by removing or substantially reducing the amount of oxidized chromium ion, comprising:
- treating the water with an oxidant;
- and
- adding to water, after exposing the water to said oxidant, an amount of a stannous salt of an inorganic acid effective to reduce a substantial portion of any Cr+6 present to a lower oxidation state.
Dependencies are inferred from the claim text.