Method for reducing the amount of and preventing the formation of hydrogen sulfide in an aqueous system 机翻标题: 暂无翻译,请尝试点击翻译按钮。

公开号/公开日
US5405531 A 1995-04-11 [US5405531] / 1995-04-11
申请号/申请日
1993US-08018288 / 1993-02-16
发明人
HITZMAN DONALD O;SPERL GEORGE T;SANDBECK KENNETH A;
申请人
GEO MICROBIAL TECHNOLOGIES;
主分类号
IPC分类号
A01N-059/00C02F-001/50C02F-003/30C02F-003/34
摘要
(US5405531) Hydrogen sulfide present in an aqueous system is removed and the production of hydrogen sulfide by sulfate-reducing bacteria (SRB) is eliminated by introducing into the system nitrite and nitrate and/or molybdate ions, whereby denitrifying microorganisms outcompete the sulfate-reducing bacteria for the available carbon nutrients, thus preventing the SRB from producing hydrogen sulfide and the nitrite along with the denitrifying microorganisms remove hydrogen sulfide already present in the system.  The system which contains the denitrifying microorganisms and which is essentially free of hydrogen sulfide can enhance oil recovery by means of a microbial enhanced oil recovery mechanisms.
机翻摘要
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地址
代理人
代理机构
;
优先权号
1993US-08018288 1993-02-16
主权利要求
(US5405531) What is claimed is: 1.  A method of reducing the amount of hydrogen sulfide which may be present in an aqueous system comprised of water and hydrogen sulfide and preventing the formation of hydrogen sulfide in the aqueous system, comprising the step of bringing nitrate and nitrite ions, or compounds which yield these ions, into contact with the aqueous system in a concentration sufficient to establish and enhance the growth of denitrifying bacteria, wherein denitrifying bacteria are present in the aqueous system prior to said step or added concurrently with or after said step, and wherein the denitrifying bacteria in the system outcompete sulfate reducing bacteria which may be present in the system for organic nutrients which may be present in the system, such that the sulfate reducing bacteria are deprived of the organic nutrients they need to produce hydrogen sulfide. 2. The method of claim 1, wherein the aqueous system which is contacted with the nitrate and nitrite ions or compounds yielding these ions, contains sulfate-reducing bacteria. 3. The method of claim 1, wherein the aqueous system which is contacted with the nitrate and nitrite ions or compounds yielding these ions, contains denitrifying microorganisms. 4. The method of claim 1, further comprising adding denitrifying microorganisms to the aqueous system before, concomitant with, or after the ions or ion yielding compounds are added to the aqueous system. 5. The method of claim 1 which is a batch method, whereby the aqueous system is contacted once with the nitrate and nitrite ions or ion-yielding compounds. 6. The method of claim 1 which is a continuous method, whereby the aqueous system is repeatedly treated with the nitrate and nitrite ions or ion-yielding compounds. 7. The method of claim 1, further comprising adding to the aqueous system a water-soluble carbon-source nutrient for the denitrifying microorganisms before, concomitant with, or after the addition of the ions or ion-yielding compounds. 8. The method of claim 7, wherein the carbon source comprises an acetate. 9. The method of claim 1, wherein the aqueous system to be contacted indigenously comprises a carbon-source nutrient for the denitrifying microorganisms. 10. The method of claim 1, further comprising adding a molybdate or molybdate yielding material, to the aqueous system either before, concurrently, or after the addition of the nitrate and nitrite ions or ion-yielding compound. 11. The method of claim 10, wherein about 5 to about 250 ppm of molybdate are added to the aqueous system. 12. The method of claim 1, wherein the aqueous system to be contacted, at the time of nitrate and nitrite ion contact, does not contain sulfate-reducing bacteria which are generating hydrogen sulfide. 13. The method of claim 1, wherein the aqueous system is contacted with less than about 3000 ppm of the total of nitrate and nitrite ions. 14. The method of claim 13, wherein the aqueous system is contacted with between about 25 and about 500 ppm of the total of nitrate and nitrite ions. 15. The method of claim 13, wherein the aqueous system is contacted with between about 1 and about 500 parts of nitrite ions and between about 1 and 500 parts of nitrate ions. 16. The method of claim 15, wherein the ratio of nitrate to nitrite ions is between about 50:1 to about 1:50. 17. A process according to claim 1, wherein the denitrifying bacteria consume as a nutrient hydrogen sulfide present in the aqueous system thereby further reducing the amount of hydrogen sulfide in the aqueous system. 18. A process according to claim 1, wherein the aqueous system contacted does not contain hydrogen sulfide. 19. A process according to claim 1, wherein the aqueous system contacted contains hydrogen sulfide. 20. A method of recovering oil from oil wells comprising injecting an aqueous system which has been treated in accordance with claim 1, into a subterranean oil-bearing formation. 21. A method of reducing the amount of hydrogen sulfide which may De present in an aqueous system comprised of water and preventing the formation of hydrogen sulfide in the aqueous system, comprising the step of bringing molybdate and nitrite ions or compounds which yield these ions, into contact with the aqueous system in a concentration sufficient to inhibit or kill sulfate-reducing bacteria which may be present and in a concentration sufficient to establish and enhance the growth of denitrifying bacteria. 22. A method of claim 21, wherein about 1 to about 250 ppm of nitrite ion and about 5 to about 200 ppm of molybdate ion are contacted with the aqueous system. 23. A method of reducing the amount of hydrogen sulfide which may be present and preventing the formation of hydrogen sulfide in an aqueous system, comprising the step of bringing nitrite ions or compounds which yield these ions, and at least one of nitrate and molybdate ions or compounds which yield these ions into contact with an aqueous system in a concentration sufficient to establish and enhance the growth of denitrifying bacteria, wherein said denitrifying bacteria are present in the aqueous system prior to bringing the ions into contact with the system, and/or added concurrently with or after the ions are brought into contact with the system, and wherein the denitrifying bacteria in the system outcompete sulfate-reducing bacteria which may be present in the system for organic nutrients which may be present in the system, such that the sulfate reducing bacteria are deprived of the organic nutrients they need to produce hydrogen sulfide.
法律状态
(US5405531) LEGAL DETAILS FOR US5405531  Actual or expected expiration date=2013-02-16    Legal state=DEAD    Status=EXPIRED     Event publication date=1993-02-16  Event code=US/APP  Event indicator=Pos  Event type=Examination events  Application details  Application country=US US08018288  Application date=1993-02-16  Standardized application number=1993US-08018288     Event publication date=1993-02-16  Event code=US/EXMR  Event type=Administrative notifications  USPTO Examiner Name Primary Examiner: WYSE, THOMAS G    Event publication date=1993-02-16  Event code=US/ART  Event type=Administrative notifications  USPTO Art Group  ART=1308     Event publication date=1993-02-16  Event code=US/DK  Event type=Examination events  Attorney Docket Number Docket Nbr: 18819/114    Event publication date=1993-02-16  Event code=US/SMALL  Event type=Administrative notifications  Appl Has Filed a Verified Statement of Micro to Small Entity Status Business Entity Status: SMALL    Event publication date=1993-02-16  Event code=US/AIA  Event type=Administrative notifications  First Inventor File Indicated:  AIA=No     Event publication date=1993-02-16  Event code=US/AS  Event type=Change of name or address  Event type=Reassignment  Assignment  Effective date of the event=1993-02-09  ASSIGNMENT OF ASSIGNORS INTEREST. ASSIGNORS:HITZMAN, DONALD O. SPERL, GEORGE T. SANDBECK, KENNETH A. REEL/FRAME:006432/0528     Event publication date=1993-03-29  Event code=US/TRDD  Event type=APL  Decision by documentation    Event publication date=1993-03-30  Event code=US/IDS  Event type=Examination events  Event type=OAI  Information Disclosure Statement Filed    Event publication date=1993-04-15  Event code=US/DOCK  Event indicator=Pos  Event type=Examination events  Case Docketed to Examiner    Event publication date=1993-09-29  Event code=US/CTNF  Event type=Examination events  Event type=OA  Event type=OAO  Non-Final Rejection    Event publication date=1994-02-17  Event code=US/CTNFR  Event type=Examination events  Event type=OAI  Response after Non-Final Action    Event publication date=1994-05-13  Event code=US/CTMS  Event type=Examination events  Event type=OAO  Miscellaneous Action with SSP    Event publication date=1994-05-18  Event code=US/CTNFR  Event type=Examination events  Event type=OAI  Response after Non-Final Action    Event publication date=1994-06-14  Event code=US/NOAM  Event indicator=Pos  Event type=Examination events  Event type=OAO  Mail Notice of Allowance    Event publication date=1995-01-20  Event code=US/EXAC  Event type=Examination events  Event type=OAO  Examiner's Amendment Communication    Event publication date=1995-03-06  Event code=US/ISSM  Event indicator=Pos  Event type=Examination events  Event type=OAO  Event type=Restitution or restoration  Issue Notification Mailed    Event publication date=1995-03-31  Event code=US/PAT  Event indicator=Pos  Event type=Event indicating In Force  Patented Case    Event publication date=1995-04-11  Event code=US/A  Event indicator=Pos  Event type=Event indicating In Force  Patents Granted before 2001-04-15  Publication country=US  Publication number=US5405531  Publication stage Code=A  Publication date=1995-04-11  Standardized publication number=US5405531     Event publication date=1998-10-07  Event code=US/FPAY  Event indicator=Pos  Event type=Event indicating In Force  Event type=Payment or non-payment notifications  Fee payment recorded   Annual fees payment date=1998-10-07     Year of payment of annual fees=4     Event publication date=1999-10-26  Event code=US/NMFP  Event type=Payment or non-payment notifications  Publication of First Notice of Maintenance Fees Payable. PAYMENT NOTICE YEAR:  Year of payment of annual fees=3     Event publication date=2002-04-23  Event code=US/NMFP  Event type=Payment or non-payment notifications  Publication of First Notice of Maintenance Fees Payable. PAYMENT NOTICE YEAR:  Year of payment of annual fees=7     Event publication date=2002-09-23  Event code=US/FPAY  Event indicator=Pos  Event type=Event indicating In Force  Event type=Payment or non-payment notifications  Fee payment recorded   Annual fees payment date=2002-09-23     Year of payment of annual fees=8     Event publication date=2006-04-25  Event code=US/NMFP  Event type=Payment or non-payment notifications  Publication of First Notice of Maintenance Fees Payable. PAYMENT NOTICE YEAR:  Year of payment of annual fees=11     Event publication date=2006-09-14  Event code=US/FPAY  Event indicator=Pos  Event type=Event indicating In Force  Event type=Payment or non-payment notifications  Fee payment recorded   Annual fees payment date=2006-09-14     Year of payment of annual fees=12     Event publication date=2013-02-16  Event code=US/EEDX  Event indicator=Neg  Event type=Event indicating Not In Force  Patent has expired
专利类型码
A
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