Fluid conveyed material collection system

• US 7,067,057 B2
• Filed: 05/24/2002
• Issued: 06/27/2006
• Est. Priority Date: 10/27/1999
• Status: Expired due to Term

• Current Assignee: Energysolutions LLC (Rockwell Holdco, Inc.)
• Original Assignee: RWE NUKEM Corporation (Rockwell Holdco, Inc.)
• Inventors: Rosenberger, Stefan, Snyder, Thomas S, Wilson, James H
• Primary Examiner(s): Cecil, Terry K.
• Application Number:
  US10/154,693
• Publication Number:
  US 20020179545A1
• Time in Patent Office: 1,495 Days
• Field of Search: 738/632.3, 73/615.9, 436/177, 436/178, 210/650, 210/652, 210/806, 210/252, 210/323.1, 210/195.2, 210/206, 210/863.24, 422/101
• US Class Current: 210/195.2
• CPC Class Codes: B01D 2311/04 Specific process operations in the feed stream; Feed pretreatment
• CPC Class Codes: B01D 2311/16 Flow or flux control
• CPC Class Codes: B01D 2311/2649 Filtration
• CPC Class Codes: B01D 2321/04 Backflushing
• CPC Class Codes: B01D 2321/168 Use of other chemical agents
• CPC Class Codes: B01D 2321/185 Aeration
• CPC Class Codes: B01D 61/146 comprising multiple ultrafiltration steps
• CPC Class Codes: B01D 61/149 Multistep processes comprising different kinds of membrane processes selected from ultrafiltration or microfiltration
• CPC Class Codes: B01D 61/16 Feed pretreatment
• CPC Class Codes: B01D 65/02 Membrane cleaning or sterilisation ; Membrane regeneration
• CPC Class Codes: B01D 69/14 Dynamic membranes
• CPC Class Codes: C02F 1/001 Processes for the treatment of water whereby the filtration technique is of importance C02F1/44 takes precedence; construction of filters in general B01D24/00 - B01D41/00
• CPC Class Codes: C02F 1/44 by dialysis, osmosis or reverse osmosis general membrane separation processes B01D61/00, membrane modules B01D63/00, electrodialysis C02F1/4693, combination of membrane modules and bioreactors C02F3/1268
• CPC Class Codes: C02F 1/441 by reverse osmosis
• CPC Class Codes: C02F 1/442 by nanofiltration
• CPC Class Codes: C02F 1/444 by ultrafiltration or microfiltration
• CPC Class Codes: C02F 2303/16 Regeneration of sorbents, filters
• CPC Class Codes: G21C 19/48 Non-aqueous processes
• CPC Class Codes: G21F 9/04 Treating liquids
• CPC Class Codes: G21F 9/12 by absorption; by adsorption; by ion-exchange
• CPC Class Codes: G21F 9/125 : by solvent extraction
• CPC Class Codes: Y02E 30/30 : Nuclear fission reactors
• CPC Class Codes: Y02W 30/50 : Reuse, recycling or recovery technologies
• CPC Class Codes: Y10T 436/255 : including use of a solid sorbent, semipermeable membrane, or liquid extraction

Abstract

The present invention is for processing fluids, especially waste streams from nuclear power plants, and other fluid media that may be carrying valuable or useful substances, in order to collect the substances. The system uses sequential filtering and multiple passes to concentrate the substances, which allows the system to collect virtually all of the substances of interest to the user while reducing the volume of both the unwanted materials as well as the desired materials desired without affecting the purity of the fluid after processing. Additionally, the collected substances can be processed in-place, and without requiring any thermal processing prior to disposal of unwanted substances, or for the recovery and/or reuse of valuable substances.

Claims

1. A two-stage fluid treatment system for collecting substances carried by a fluid said system comprising:

a first filter having a first upstream side, a first down stream side, and a first particle collection size rating, said first upstream side of said first filter being in fluid communication with a source of fluid, wherein upon contact with said first filter, said fluid is divided into a first filter filtrate and a first filter reject, said first filter reject containing particulate and dissolved substances;

a first stage recycle loop in fluid communication with said first filter and adapted to carry a first stage reject recirculation stream, said first stage reject recirculation stream adapted to receive said first filter reject;

means for directing and controlling said first stage reject recirculation stream;

a second filter in fluid communication with said first filter and said first stage recycle loop, said second filter having a second upstream side, a second down stream side, and a second particle collection size rating that is no smaller than said first particle collection size rating, wherein said second filter is adapted to receive said first filter reject from said second upstream side, wherein upon contact with said second filter, said first filter reject is divided into a second filter filtrate and a second filter reject, said first stage recirculation stream adapted to receive said second filter filtrate from said second down stream side;

a sequential step fluid filtering system in fluid communication with said first filter, said sequential step fluid filtering system comprising;

an initial filter, said initial filter having an initial filter particle collection size rating;

an intermediate filter, said intermediate filter having an intermediate filter particle collection size rating that is no smaller than said initial filter particle collection size rating;

a final filter, said final filter having a final filter particle collection size rating that is no smaller than said intermediate filter particle collection size rating, wherein said initial filter is adapted to process said first filter filtrate, said first filter filtrate being divided into an initial filter filtrate and an initial filter reject upon contact with said initial filter, wherein said intermediate filter is adapted to process said initial filter reject, said initial filter filtrate being divided into an intermediate filter filtrate and an intermediate filter reject upon contact with said intermediate filter, and wherein said final filter is adapted to process said intermediate filter reject, said intermediate filter filtrate being divided into a final filter filtrate and a final filter reject upon contact with said final filter; and

a first filter reject cake connected to said second filter that is formed by the agglomeration of said particulate on said second filter upstream side, wherein said directing and controlling means is adapted to direct a portion of said first stage reject recirculation stream through said second filter at a flux low enough to just pass through said second filter so as to form said first filter reject cake.

2. The system as recited in claim 1, wherein said first filter is an ultra filter.

3. The system as recited in claim 1, wherein said second filter is a micro filter.

4. The system as recited in claim 1, wherein said initial filter is a reverse osmosis unit.

5. The system as recited in claim 1, wherein said initial filter is an ion exchange polisher.

6. The system as recited in claim 1, wherein said intermediate filter is an ultra filter.

7. The system as recited in claim 1, wherein said final filter is a micro filter.

8. The system as recited in claim 1, further comprising means for backflushing said first filter that is in fluid communication with said first filter, wherein said backflushing means includes a backflushing fluid.

9. The system as recited in claim 8, further comprising means for collecting said backflushing fluid that is in fluid communication with said backflushing means.

10. The system as recited in claim 9 means for directing said backflushing fluid that is in fluid communication with said backflushing means, wherein said backflushing fluid directing means is adapted to direct said backflushing fluid to and from said backflushing collecting means.

11. The system as recited in claim 1, further comprising means for introducing a precipitating agent that is in fluid communication with said first stage reject recirculation stream, said precipitating agent capable of precipitating said dissolved substances so as to facilitate the formation of said first filter cake.

12. The system as recited in claim 1, where said first filter is pre-coated with a material for the promotion of the formation of said first filter cake.

13. The system as recited in claim 1, further comprising means for establishing a high velocity flow of said fluid across said first filter upstream side of said ultra filter.

14. The system as recited in claim 1, further comprising means for establishing a high velocity flow of said first filter filtrate across the upstream side of said initial filter.

15. The system as recited in claim 1, further comprising means for establishing a high velocity flow of said initial filter reject across the upstream side of said intermediate filtrate.

16. The system as recited in claim 1, wherein said first filter is capable of withstanding pressures in the range of about 760 mm Hg vacuum to about 1000 psig.

17. A two-stage fluid treatment system for collecting substances carried by a fluid said system comprising:

a first filter having a first upstream side, a first down stream side, and a first particle collection size rating, said first upstream side of said first filter being in fluid communication with a source of fluid, wherein upon contact with said first filter, said fluid is divided into a first filter filtrate which passes through said first filter and a first filter reject which does not pass through said first filter, said first filter reject containing particulate and dissolved substances;

a first stage recycle loop in fluid communication with said first filter and adapted to carry a first stage reject recirculation stream, said first stage reject recirculation stream adapted to receive said first filter reject;

means for directing and controlling said first stage reject recirculation stream;

a second filter in fluid communication with said first filter and said first stage recycle loop, said second filter having a second upstream side, a second down stream side, and a second particle collection size rating that is no smaller than said first particle collection size rating, wherein said second filter is adapted to receive said first filter reject from said second upstream side, wherein upon contact with said second filter, said first filter reject is divided into a second filter filtrate and a second filter reject, said first stage recirculation stream adapted to receive said second filter filtrate from said second down stream side;

a first reject cake connected to said second filter that is formed by the agglomeration of said particulate on said second filter upstream side, wherein said first stage reject recirculation stream directing and controlling means is adapted to direct a portion of said first stage reject recirculation stream through said second filter at a flux low enough to just pass through said second filter so as to form said first filter reject cake;

a sequential step fluid filtering system in fluid communication with said first filter, said sequential step fluid filtering system comprising;

an initial filter, said initial filter having an initial filter particle collection size rating;

an intermediate filter, said intermediate filter having an intermediate filter particle collection size rating that is no smaller than said initial filter particle collection size rating; and

a final filter, said final filter having a final filter particle collection size rating that is no smaller than said intermediate filter particle collection size rating, wherein said initial filter is adapted to process said first filter filtrate, said first filter filtrate being divided into an initial filter filtrate and an initial filter reject upon contact with said initial filter, wherein said intermediate filter is adapted to process said initial filter reject, said initial filter filtrate being divided into an intermediate filter filtrate and an intermediate filter reject upon contact with said intermediate filter, and wherein said final filter is adapted to process said intermediate filter reject, said intermediate filter filtrate being divided into a final filter filtrate and a final filter reject upon contact with said final filter;

a second stage recycle loop in fluid communication with said intermediate filter and adapted to carry a second stage reject recirculation stream, said second stage reject recirculation stream adapted to receive said intermediate filter reject;

means for directing and controlling said second stage reject recirculation stream; and

a second reject cake connected to said final filter that is formed by the agglomeration of said particulate on said final filter upstream side, wherein said second stage reject recirculation stream directing and controlling means is adapted to direct a portion of said second stage reject recirculation stream through said final filter at a flux low enough to just pass through said final filter so as to form said second reject cake.