Patent
Process for treatment of contaminated waste water or groundwater
| العنوان: | Process for treatment of contaminated waste water or groundwater |
|---|---|
| Patent Number: | 5,124,051 |
| تاريخ النشر: | June 23, 1992 |
| Appl. No: | 07/619,573 |
| Application Filed: | November 29, 1990 |
| مستخلص: | A process is provided for treating aqueous waste or groundwater contaminated with nitro-containing organic chemicals to degrade the compound sufficiently to permit disposal of the waste or groundwater. |
| Inventors: | Bircher, Keith G. (Richmond Hill, CAX); Luong, Cuong V. (Mississauga, CAX) |
| Assignees: | Solarchem Enterprises Inc. (Ontario, CAX) |
| Claim: | We claim |
| Claim: | 1. A process for treating aqueous waste or groundwater contaminated with a nitro-containing organic chemical compound having a pK.sub.a of 15 or less said process comprising the steps of |
| Claim: | (a) adjusting the pH of said aqueous waste or groundwater to a pH greater than 10 to permit an effective amount of hydrolysis of said compound; and |
| Claim: | (b) treating said waste or groundwater with at least one hydroxyl radical generating agent comprising ozone in an effective amount based on the initial concentration of said compound in said waste or groundwater, the amount of said hydrolysis of said compound and the amount of said hydroxyl radical generating agent being sufficient to reduce the concentration of the compound in said waste or groundwater to a desired discharge level. |
| Claim: | 2. A process according to claim 1 wherein said nitro-containing compound is a nitro-toluene. |
| Claim: | 3. A process according to claim 2 wherein said nitro-toluene is a dinitrotoluene. |
| Claim: | 4. A process according to claim 2 wherein said nitro-toluene is a trinitrotoluene. |
| Claim: | 5. A process according to claim 4 wherein said nitro-toluene is 2,4,6-trinitrotoluene and said waste or groundwater is adjusted to a pH in the range of about 10.7 to about 14.0. |
| Claim: | 6. A process according to claim 5 wherein said waste or groundwater is adjusted to a pH in the range of about 11.0 to about 12.0. |
| Claim: | 7. A process according to claim 1 wherein step (b) comprises treating said waste or groundwater with ozone at an ozone: 2,4,6-trinitrotoluene ratio of about 4 to 5:1 w/w. |
| Claim: | 8. A process according to claim 1 wherein step (b) comprises treating said waste or groundwater with ozone until said waste or groundwater meets a 96-hour LC.sub.50 toxicity test and further comprising the step of treating said waste or groundwater with hydrogen peroxide and ultraviolet light until 2,4,6-trinitrotoluene therein is at the desired discharge level. |
| Claim: | 9. A process according to claim 1 wherein step (b) comprises treating said waste or groundwater with ozone until said waste or groundwater meets a 96-hour LC.sub.50 toxicity test and further comprising the step of treating said waste or groundwater with ultraviolet light until 2,4,6-trinitrotoluene therein is at the desired discharge level. |
| Claim: | 10. A process according to claim 1 wherein the pH of said waste is adjusted by addition of a suitable base. |
| Claim: | 11. A process according to claim 1 wherein the pH of said waste is adjusted by addition of a sodium hydroxide. |
| Claim: | 12. A process according to claim 1 wherein the concentration of the compound in said waste or groundwater is not greater than about 1 ppm. |
| Claim: | 13. A process according to claim 1 wherein the waste or groundwater is adjusted to a pH in the range of about 10.7 to about 14.0. |
| Claim: | 14. A process according to claim 1 wherein the waste or groundwater is maintained at said adjusted pH before said treatment step for a time sufficient to assist in hydrolysis of said compound. |
| Current U.S. Class: | 210/748; 210/759; 210/760; 210/903; 210/909; 149/124 |
| Current International Class: | C02F 178 |
| Patent References Cited: | 3856673 December 1974 De La Mater et al. 4038116 July 1977 Andrews et al. 4073726 February 1978 Okamoto et al. 4793931 December 1988 Stevens et al. 4861497 August 1989 Welch et al. 4956098 September 1990 Stevens et al. |
| Other References: | Hoigne et al, "The Role of Hydroxyl Radical Reactions In Ozonation Processes in Aqueous Solution," Solarchem, vol. 10, pp. 377-386. Layne et al, "Ultraviolet-Ozone Treatment of Pink Wastewater, a Pilot Scale Study," Mason & Hanger-Silas Mason Co., Inc., Iowa Army Ammunition Plant, Middletown, Iowa AD-B 068215, 1982. Ho, "Photooxidation of 2,4-Dinitrotoluene in Aqueous Solution in the Presence of Hydrogen Peroxide," Environmental Science Technology, vol. 20, No. 3, 1986, pp. 260-266. |
| Primary Examiner: | Hruskoci, Peter |
| Assistant Examiner: | McCarthy, Neil M. |
| Attorney, Agent or Firm: | Lowe, Price, LeBlanc & Becker |
| رقم الانضمام: | edspgr.05124051 |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |