Thomas E Higgins

US Patent:

7645092, Jan 12, 2010

Filed:

May 31, 2007

Appl. No.:

11/756387

Inventors:

Thomas E. Higgins - Reston VA, US

Assignee:

CH2M Hill, Inc. - Englewood CO

International Classification:

B09C 1/00

US Classification:

40512875, 588319, 588412

Abstract:

In methods for treatment of in ground chromium ore processing residue contamination, ferrous sulfide is provided as a substantially insoluble material in the residue deposit. The ferrous sulfide accordingly may remain substantially in place, in the pores of the soil or residue, even over long periods of time, regardless of underground water movement or diffusion. As a result, the ferrous sulfide may act continuously to chemically reduce and remove contamination. As hexavalent chromium diffuses from the soil or residue, it is reduced by the ferrous sulfide. The ferrous sulfide may be placed into the underground deposit by injecting a ferrous salt solution into the deposit, waiting for a precipitation to elapse, and then injecting a sulfide solution into the deposit.

US Patent:

20070098501, May 3, 2007

Filed:

Mar 30, 2006

Appl. No.:

11/278009

Inventors:

Thomas Higgins - Reston VA, US
Thomas Simpkin - Centennial CO, US

International Classification:

B09C 1/00

US Classification:

405128100

Abstract:

In systems and methods for treatment of underground contamination, ferrous sulfide is provided as a substantially insoluble material in an underground formation. The ferrous sulfide accordingly may remain substantially in place, even over long periods of time, regardless of underground water movement or diffusion. As a result, the ferrous sulfide may act continuously to chemically reduce and remove contamination. When used for treatment of chromium ore processing residue contamination, the ferrous sulfide may remain in the pores of the soil or residue. As hexavalent chromium diffuses from the soil or residue, it is reduced by the ferrous sulfide. The ferrous sulfide may be injected as a liquid into the underground formation, and then change to a more solid form. Chlorinated solvent contamination, dissolved chromium from other than COPR contamination, and other dissolved metals may also be treated.

US Patent:

20070098502, May 3, 2007

Filed:

Feb 24, 2006

Appl. No.:

11/361325

Inventors:

Thomas Higgins - Reston VA, US
Thomas Simpkin - Centennial CO, US

International Classification:

B09C 1/00

US Classification:

405128100

Abstract:

In systems and methods for treatment of underground contamination, a reducing compound is provided as a substantially insoluble material in an underground formation. The reducing compound accordingly remains substantially in place, even over long periods of time, and is not washed out by underground water movement or diffusion. Accordingly, the reducing compound acts continuously to chemically reduce and remove contamination. When used for treatment of chromium ore processing residue contamination, the reducing compound may be formed and remain in the pores of the residue. As hexavalent chromium diffuses from the residue, it is reduced by the reducing compound. The reducing compound may be injected as a liquid into the underground formation, and then change to a more solid form. Chlorinated solvent contamination may also be treated.

US Patent:

20090130013, May 21, 2009

Filed:

Jul 2, 2008

Appl. No.:

12/167139

Inventors:

Thomas E. Higgins - Reston VA, US

Assignee:

CH2M HILL, Inc. - Englewood CO

International Classification:

C01B 17/00

US Classification:

4232421

Abstract:

A method for treating flue gas may include adding iron to a slurry in a ratio between approximately 20-to-1 and 5000-to-1 by weight of iron to a weight of mercury, selenium or other heavy metal to be removed from the flue gas, and contacting the slurry with the flue gas in a flue gas desulfurization system. A system for treating flue gas may include a scrubber, a slurry tank, and a water source. Water and limestone may be combined in the slurry tank to form a limestone slurry. At least a portion of the limestone slurry may be used to treat flue gas in the scrubber. Iron may be added to at least a portion of the limestone slurry used to treat flue gas in the scrubber. The iron used in either the method or system may be a ferrous or ferric salt, or elemental iron.

US Patent:

55625886, Oct 8, 1996

Filed:

Dec 30, 1994

Appl. No.:

8/366458

Inventors:

Thomas E. Higgins - Reston VA

Assignee:

Maxus Energy Corporation - Dallas TX

International Classification:

C02F 162
C12P 104

US Classification:

588256

Abstract:

Provided is a process for the treatment of Cr(VI)-bearing solids or soil by the in situ biological reduction of Cr(VI) to insoluble Cr(III). The pH of the Cr(VI)-bearing solids are adjusted with an acid or base to a pH of about 6. 5 to 9. 5, and thoroughly mixed in situ mixed with an organic material (such as manure) containing bacteria and nutrients.

Address:

2112 Lirio Ct, Reston, VA 20191

VIN:

JTNBB46K873010623

Make:

Toyota

Model:

CAMRY HYBRID

Year:

2007