IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0176018
(2005-07-07)
|
등록번호 |
US-7285207
(2007-10-23)
|
발명자
/ 주소 |
- Hunniford,David J.
- Morano,David L.
- Harshman,James Paul
|
출원인 / 주소 |
- Siemens Water Technologies Holding Corp.
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
44 |
초록
▼
A method and apparatus for treating wastewater streams by adding, either separately or as a mixture, a nitrate containing compound and an alkaline material in an amount sufficient to achieve a lower concentration of atmospheric hydrogen sulfide and dissolved sulfides downstream of the addition as co
A method and apparatus for treating wastewater streams by adding, either separately or as a mixture, a nitrate containing compound and an alkaline material in an amount sufficient to achieve a lower concentration of atmospheric hydrogen sulfide and dissolved sulfides downstream of the addition as compared to the atmospheric hydrogen sulfide and dissolved sulfides present in the wastewater stream prior to the addition. By adding alkaline material in addition to a nitrate containing compounds, the amount of nitrate containing compound added can be reduced by at least 10% as compared to the amount of nitrate that would theoretically need to be added in the absence of alkaline material to achieve a comparable lower concentration of atmospheric hydrogen sulfide and dissolved sulfides in the wastewater stream.
대표청구항
▼
The invention claimed is: 1. A computer readable medium encoded with a program that, when executed on a processor of a computer, performs a method of treating a wastewater stream, comprising acts of: (a) adding a nitrate containing compound at a first position in the wastewater stream; (b) adding a
The invention claimed is: 1. A computer readable medium encoded with a program that, when executed on a processor of a computer, performs a method of treating a wastewater stream, comprising acts of: (a) adding a nitrate containing compound at a first position in the wastewater stream; (b) adding an alkaline material at a second position in the wastewater stream; (c) sensing a level of at least one of atmospheric hydrogen sulfide, dissolved sulfide, and residual nitrate in the wastewater stream downstream of the first and second positions; and (d) adjusting an amount of at least one of the nitrate containing compound and the alkaline material added to the wastewater stream in response to the act of sensing. 2. The computer readable medium of claim 1, wherein the act (b) includes an act of adding the alkaline material in an amount sufficient to raise a pH of the wastewater stream downstream of the first and second positions by approximately one unit of pH. 3. The computer readable medium of claim 1, wherein the act (b) includes an act of adding the alkaline material in an amount sufficient to raise a pH of the wastewater stream downstream of the first and second positions to between approximately 7.5 and 8.5 units of pH. 4. The computer readable medium of claim 1, wherein the act (c) includes an act of sensing the level of atmospheric hydrogen sulfide and the level of dissolved sulfide in the wastewater stream downstream of the first and second positions, and wherein the act (d) includes an act of increasing an amount of the nitrate containing compound added in act (a) when the level of at least one of atmospheric hydrogen sulfide and dissolved sulfide sensed in act (c) is greater than a desired level. 5. The computer readable medium of claim 1, wherein the act (c) includes an act of sensing the level of atmospheric hydrogen sulfide and the level of dissolved sulfide in the wastewater stream downstream of the first and second positions, and wherein the act (d) includes an act of increasing an amount of the alkaline material added in act (b) when the level of at least one of atmospheric hydrogen sulfide and dissolved sulfide sensed in act (c) is greater than a desired level. 6. The computer readable medium of claim 1, wherein the act (c) includes an act of sensing the level of atmospheric hydrogen sulfide and the level of dissolved sulfide in the wastewater stream downstream of the first and second positions, and wherein the act (d) includes acts of increasing an amount of the nitrate containing compound added in act (a) and increasing an amount of the alkaline material added in act (b) when the level of atmospheric hydrogen sulfide and the level of dissolved sulfide sensed in act (c) are greater than a desired level. 7. The computer readable medium of claim 1, wherein the act (c) includes an act of sensing the level of atmospheric hydrogen sulfide and the level of dissolved sulfide in the wastewater stream downstream of the first and second positions, and wherein the act (d) includes an act of decreasing an amount of the nitrate containing compound added in act (a) when the level of at least one of atmospheric hydrogen sulfide and dissolved sulfide sensed in act (c) is less than a desired level. 8. The computer readable medium of claim 1, wherein the act (c) includes an act of sensing the level of atmospheric hydrogen sulfide and the level of dissolved sulfide in the wastewater stream downstream of the first and second positions, and wherein the act (d) includes an act of decreasing an amount of the alkaline material added in act (b) when the level of at least one of atmospheric hydrogen sulfide and dissolved sulfide sensed in act (c) is less than a desired level. 9. The computer readable medium of claim 1, wherein the act (c) includes an act of sensing the level of atmospheric hydrogen sulfide and the level of dissolved sulfide in the wastewater stream downstream of the first and second positions, and wherein the act (d) includes acts of decreasing an amount of the nitrate containing compound added in act (a) and decreasing an amount of the alkaline material added in act (b) when the level of atmospheric hydrogen sulfide and the level of dissolved sulfide sensed in act (c) are less than a desired level. 10. The computer readable medium of claim 1, wherein the act (c) includes an act of sensing the level of atmospheric hydrogen sulfide, the level of dissolved sulfide, and the level of residual nitrate in the wastewater stream downstream of the first and second positions, and wherein the act (d) includes an act of decreasing an amount of the nitrate containing compound added in act (a) when the level of atmospheric hydrogen sulfide and the level of dissolved sulfide sensed in act (c) are less than a desired level and an average level of residual nitrate sensed in act (c) is approximately 1-2 mg/L or greater. 11. The computer readable medium of claim 10, further comprising acts of: (e) sensing a pH of the wastewater stream at or prior to the second position; and (f) sensing a pH of the wastewater stream downstream of the first and second positions. 12. The computer readable medium of claim 11, wherein the act (d) further includes an act of decreasing an amount of the alkaline material added in act (b) when the act (f) indicates that the pH of the wastewater downstream of the first and second positions is at least one unit of pH higher than the pH of the wastewater stream sensed in act (e). 13. The computer readable medium of claim 1, wherein the act (c) includes an act of sensing the level of atmospheric hydrogen sulfide, the level of dissolved sulfide, and the level of residual nitrate in the wastewater stream downstream of the first and second positions, and wherein the act (d) includes an act of decreasing an amount of the alkaline material added in act (b) when the level of atmospheric hydrogen sulfide sensed in act (c) is less than a first desired level, the level of dissolved sulfide sensed in act (c) is greater than a second desired level, and an average level of residual nitrate sensed in act (c) is approximately 1-2 mg/L or greater. 14. The computer readable medium of claim 1, wherein the act (c) includes an act of sensing the level of atmospheric hydrogen sulfide, the level of dissolved sulfide, and the level of residual nitrate in the wastewater stream downstream of the first and second positions, and wherein the act (d) includes an act of increasing an amount of the alkaline material added in act (b) when the level of atmospheric hydrogen sulfide sensed in act (c) is greater than a first desired level, the level of dissolved sulfide sensed in act (c) is less than a second desired level, and an average level of residual nitrate sensed in act (c) is approximately 1-2 mg/L or greater. 15. The computer readable medium of claim 1, further comprising acts of: (e) sensing a pH of the wastewater stream at or prior to the second position; and (f) sensing a pH of the wastewater stream downstream of the first and second positions. 16. The computer readable medium of claim 15, wherein the act (c) includes an act of sensing the level of atmospheric hydrogen sulfide and the level of dissolved sulfide in the wastewater stream downstream of the first and second positions, and wherein the act (d) includes an act of decreasing an amount of the alkaline material added in act (b) when the level of atmospheric hydrogen sulfide and the level of dissolved sulfide sensed in act (c) are less than a desired level, and the act (f) indicates that the pH of the wastewater downstream of the first and second positions is at least one unit of pH higher than the pH of the wastewater stream sensed in act (e). 17. The computer readable medium of claim 15, wherein the act (c) includes an act of sensing the level of atmospheric hydrogen sulfide, the level of dissolved sulfide, and the level of residual nitrate in the wastewater stream downstream of the first and second positions, and wherein the act (d) includes an act of decreasing an amount of the alkaline material added in act (b) when the level of atmospheric hydrogen sulfide and the level of dissolved sulfide sensed in act (c) are less than a desired level, the level of residual nitrate sensed in act (c) is negligible, and the act (f) indicates that the pH of the wastewater downstream of the first and second positions is at least one unit of pH higher than the pH of the wastewater stream sensed in act (e).
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