Water treatment using an iron and clay-based sorption media

Patent metadata

Field	Value
Publication number	US-10696567-B2
Application number	US-201916398050-A
Country	US
Kind code	B2
Filing date	Apr 29, 2019
Priority date	Feb 1, 2018
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A method of water treatment includes flowing water that includes nitrogen and phosphorus compounds through a sorption media composition within at least one chamber of a water treatment system. The composition comprises iron filings comprising at least 5 volume (vol) % of the composition, sand particles comprising at least 10 vol % of the composition; and clay particles comprising at least 2 vol % of the composition. The iron filings, sand particles, and clay particles are mixed together. During the flowing the clay particles attract the nitrogen and phosphorus compounds which become absorbed onto a surface of the iron filings and the clay resulting in a removal of the nitrogen and phosphorus compounds and the generation of reaction products. Nitrogen and phosphorus are then recovered from the reaction products.

First claim

The invention claimed is:

1. A method of water treatment, comprising:
flowing water that includes nitrogen and phosphorus compounds through a sorption media composition within at least one chamber of a water treatment system, said composition comprising:
iron filings comprising at least 5 volume (vol) of said composition;
sand particles comprising at least 10 vol % of said composition; and
clay particles comprising at least 2 vol % of said composition,
wherein said iron filings, said sand particles, and said clay particles are mixed together,
wherein said iron filings and said clay particles act synergistically to remove said nitrogen and said phosphorous compounds from said water, and
wherein during said flowing said clay particles attract said nitrogen and said phosphorus compounds which become absorbed onto a surface of said iron filings and said clay particles resulting in a removal of said nitrogen and said phosphorus compounds and a generation of reaction products.

2. The method of claim 1 , wherein said composition further comprises at least one recycled material selected from tire crumb and paper.

3. The method of claim 1 , wherein said reaction products generated comprise ammonia and ferrous iron.

4. The method of claim 1 , wherein said water comprises stormwater runoff, wastewater effluent, or agricultural discharge.

5. The method of claim 1 , wherein said clay particles are 2 vol % to 10 vol % of said composition.

6. The method of claim 1 , wherein a porosity of said composition is 30% to 50%.

7. The method of claim 1 , further comprising using said nitrogen and said phosphorus as a soil amendment.

8. The method of claim 1 , wherein an average size of said clay particles than an average size of the iron filings and an average size of the sand particles.

9. The method of claim 8 , wherein said average size of said clay particles is between 0.2 μm and 5 μm.

10. A method of water treatment, comprising:
flowing water that includes nitrogen and phosphorus compounds through a sorption media composition within at least one chamber of a water treatment system, said composition comprising:
iron filings comprising at least 5 volume (vol) of said composition;
sand particles comprising at least 10 vol % of said composition;
clay particles comprising at least 2 vol % of said composition; and
at least one recycled material selected from tire crumb, wood sawdust, and paper,
wherein said iron filings, said sand particles, said clay particles, and said recycled material are mixed together,
wherein said iron filings and said clay particles act synergistically to remove said nitrogen and said phosphorous compounds from said water, and
wherein during said flowing said clay particles attract said nitrogen and said phosphorus compounds which become absorbed onto a surface of said iron filings and said clay particles resulting in a removal of said nitrogen and said phosphorus compounds and a generation of reaction products including ammonia and ferrous iron.

11. The method of claim 10 , wherein said clay particles are 2 vol % to 10 vol % of said composition, and wherein an average size of said clay particles is less than an average size of the iron filings and an average size of the sand particles.

Assignees

• Univ Central Florida Res Found Inc

Inventors

• Chang Ni-Bin
• Wanielista Martin P

Classifications

• B01J20/043

  Carbonates or bicarbonates, e.g. limestone, dolomite, aragonite · CPC title

• C02F2101/105

  Phosphorus compounds · CPC title

• B01J20/28054

  characterised by their surface properties or porosity · CPC title

• B01D24/02

  with the filter bed stationary during the filtration · CPC title

• C02F2103/001

  Runoff or storm water · CPC title