Method for Nitrogen Removal and Nitrogen Salts Recovery Using Carboxylated Cellulose Extracted by Nitro-oxidation
AssigneeThe Research Foundation for The State University of New York
InventorsBenjamin S. HSIAO, Priyanka SHARMA, Sunil Kumar SHARMA, Ken I. JOHNSON
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Abstract
A method of treating contaminated water, such as wastewater, with carboxylated cellulose to remove ammonium and nitrogen-containing impurities is claimed. Carboxylated cellulose extracted by nitro-oxidation has negatively-charged functionality and forms an aggregate when exposed to positively-charged impurities in contaminated water. The aggregate, nitrogen-containing impurities, and by-products from the nitro-oxidation process can be isolated to provide a fertilizer or fertilizer component.
Claims12
A method of treating contaminated water to remove ammonium and nitrogen-containing impurities and recover ammonium salts comprising:
- (1) exposing contaminated water to carboxylated cellulose comprising negatively charged functional groups which aggregate with positively charged ammonium ions and nitrogen containing impurities in water, to form an aggregate and treated water;
- (2) separating the aggregate from the treated water;
- and
- (3) isolating ammonium salts from the aggregate,
- wherein the contaminated water comprises ammonium, nitrogen-containing impurities, or combinations thereof.
A method of making a fertilizer or a fertilizer component from contaminated water comprising:
- (a) exposing contaminated water to carboxylated cellulose comprising negatively charged functional groups which aggregate with positively charged ammonium ions and nitrogen containing impurities in water, to form an aggregate and treated water;
- and
- (b) isolating the aggregate to provide a fertilizer or fertilizer component.
Dependencies are inferred from the claim text.