Granular media for removing contaminants from water and methods for making the same
AssigneeUniversity of Washington
InventorsMark M. Benjamin, Robert P. Bailey, Thomas E. Bennett, Yu-Jung Chang, Chi-Wang Li, Marc A. Edwards, Paul R. Anderson
Life of this patent
Estimating the term…
Abstract
Adsorbent media are prepared by contacting support material with iron containing solutions, followed by drying to coat the support material with iron. Support materials such as sand and olivine are described. The adsorbent material can be used to remove metal contaminants and natural organic matter from water.
Claims21
A method of preparing an adsorbent media useful for reversibly adsorbing metal ions and for filtering particulate matter from water, comprising the steps:
- contacting an aqueous solution containing about 2 to 2.5 moles/liter ferric nitrate with a support material from the group consisting of sand, magnesium oxide, dolomite, olivine, kaolinite, illite and montmorillonite to from a mixture said aqueous solution being present in an amount sufficient to at least fill the pore spaces between the support material;
- and
- heating the mixture to dryness at a temperature below about 220.degree. C., a portion of said ferric nitrate being converted to ferric oxide during the heating step.
A method of preparing an adsorbent media useful for reversibly absorbing metal ions and for filtering particulate matter from water, comprising the steps:
- contacting an aqueous solution containing about 2 to 2.5 moles/liter ferric chloride with a support material from the group consisting of sand, magnesium oxide, dolomite, olivine, kaolinite, illite and montmorillonite to form a mixture, said aqueous solution being present in an amount sufficient to at least fill the pore spaces between the support media;
- heating the mixture to dryness at a temperature below about 220.degree. F., a portion of said ferric chloride being converted to ferric oxide during the heating step;
- and
- rehydrating the mixture from the heating step.
A method of preparing an adsorbent media useful for reversibly adsorbing natural organic matter and for filtering particulate matter from water, comprising the steps:
- preparing an aqueous solution containing about 2.0 to 2.5 moles/liter ferric chloride and hydroxyl ions in an amount effective to maintain a pH of less than 7.0;
- heating the solution to provide a past having a water content of about 45 to 55 percent by weight, a portion of said ferric chloride being converted to ferric oxide during the heating step;
- contacting the paste with a support material from the group consisting of sand, magnesium oxide, dolomite, olivine, kaolinite, illite and montmorillonite to provide a mixture;
- and
- drying the mixture.
Dependencies are inferred from the claim text.