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United States Patent (19) 11 Patent Number: 5,232,484 Pignatello 45 Date of Patent: Aug

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United States Patent (19) 11 Patent Number: 5,232,484 Pignatello 45 Date of Patent: Aug USOO5232484A United States Patent (19) 11 Patent Number: 5,232,484 Pignatello 45 Date of Patent: Aug. 3, 1993 (54). DEGRADATION OF PESTICIDES BY Waste Disposal Proceedings EPA/600/9-85/030, pp. FERRC REAGENTS AND PEROXDEN 72 to 85. THE PRESENCE OF LIGHT Johnson, L. J., and Talbot, H. W., 39 Experimentia 1236-1246 (1983). 75 Inventor: Joseph J. Pignatello, Hamden, Conn. Mill, T., and Haag, W. R., Preprints of Extended Ab 73 Assignee: The Connecticut Agricultural stracts, 198th Nat. Meeting Amer. Chem. Soc. Div. Experiment Station, New Haven, Env, Chem., A.C.S., Washington, 1969, paper 155, pp. Conn. 342-345. 21 Appl. No.: 744,365 Munnecke, D. M., 70 Residue Rev. 1-26 (1979). Murphy, A. P., et al., 23 Environ. Sci. Technol. 166-169 22 Filed: Aug. 13, 1991 (1989). 51 int. Ci...................... A01N 37/38; A01N 43/70; Nye, J. C., 1985 National Workshop on Pesticide Waste CO2F 1/72 Disposal Proceedings EPA/600/9-85/030 pp. 43 to 52 U.S.C. .................................... 588/206; 210/759; 480. 588/207; 588/210 Plimmer, J. R., et al., 19 J.Agr. Food Chem. 572-573 58 Field of Search ........................... 71/117, 116,93; (1971). 210/749, 758, 759 Schmidt, C., 1986 National Workshop on Pesticide Waste Disposal Proceedings EPA/600/9-87/001, pp. 56) References Cited 45 to 52. U.S. PATENT DOCUMENTS Sedlak, D. L. and Andren, A. W., 25 Environ. Sci. 3,819,516 6/1974 Murchison et al. ................... 422A24 Technol. 777-782 (1991). 4,569,769 2/1986 Walton et al. Watts, R. J., et al., Extended Abstracts if 156, 198th 4,585,753 4/1986 Scott et al. ACS Meeting, Env. Chem. Div., 1989, pp. 346-349. Wei, T. Y., et al., J. Photochem. Photobiol. A: Chem., OTHER PUBLICATIONS 55: 115-126 (1990). Skurlatov, Y. I. J. Agric. Food Chem. 31: 1065-1071, 1983. Primary Examiner-Allen J. Robinson Larson, R. A. "Sensitized Photodecomposition of Or Assistant Examiner-S. Mark Clardy ganic Compounds Found in Illinois Wastewaters', Attorney, Agent, or Firm-St. Onge Steward Johnston & HWRIC-RR-045, May 1990. Reens Bailin, L. J., et al., 12 Environ. Sci. Technol. 673-679 57 ABSTRACT (1978). Barbeni, M., et al., 16 Chemosphere 2225-2237 (1987) at A method for mineralizing pesticides, notably aromatic 2229 and Figure 4 on 2232. pesticides, using ferric ion in an acid aqueous solution at Ehart, O. R. 1985 National Workshop on Pesticide room temperature is disclosed. In a preferred embodi Waste Disposal Proceedings EPA/600/9-85/030, pp. 2 ment, the ferric ion is employed in the presence of hy to 11. drogen peroxide; degradation occurs in the light or in Eul, W., et al., “Hydrogen Peroxide-Based Treatment the dark, although light accelerates the degradation. Technology for Hazardous Waste," Emerging Tech The method also is functional in the absence of hydro nologies In Hazardous Waste Management, ACS Sym gen peroxide, but light and oxygen is required in this posium No. 422, 1990, 1-35 at 29. method. Preferred degradation methods are conducted Ferguson, T. L., and Wilkinson, R. R. in Krueger, R. in the presence of hydrogen peroxide and light, and in F., and Seiber, J. N. eds, Treatment and Disposal of the absence of large concentrations of organic solvents, Pesticide Wastes, ACS, 1984, Chapter 11, pp. 181 to chloride, and sulfate. 191. Honeycutt, R. C., 1985 National Workshop on Pesticide 13 Clains, 11 Drawing Sheets OO OO 150 2OO 250 Minutes U.S. Patent Aug. 3, 1993 Sheet 1 of 11 5,232,484 O 50 1OO 150 2OO 250 Minutes GURE O 5O OO 150 2OO 250 EGUREC A U.S. Patent Aug. 3, 1993 Sheet 2 of 11 5,232,484 O 50 1 OO 150 2OO 250 SOO 350 Minutes GUTREC 2 No a. A a s a s As -. T-A-.. 'c in solution is A * - - - - - - -.. A r s is a see - - - . Minutes GURE 3 U.S. Patent Aug. 3, 1993 Sheet 3 of 11 5,232,484 g 1 MNaCIO FGUREC 4 U.S. Patent Aug. 3, 1993 Sheet 4 of 11 5,232,484 EIGREC 6 4.68 O. 2 O. O O.O U.S. Patent Aug. 3, 1993 Sheet 5 of 11 mn GURE 7. A U.S. Patent Aug. 3, 1993 Sheet 6 of 11 5,232,484 1.O. .9 5 0.8 O - 0.6 C) v 5 O.4 al () S 0.2 O.O O.O S.O .95 2.5 E 8 2.O O C) 15 2 1.0 s Y. O. 5 O. O FIGURE LO U.S. Patent Aug. 3, 1993 Sheet 7 of 11 5,232,484 Hours EfIGURE 11 FCURE LA U.S. Patent Aug. 3, 1993 Sheet 8 of 11 5,232,484 C O P O ? S O t C O and O O h L1 Hours ECG REC 2 Fel olone 1 OO O Ho, alone ?t 8O Fell (FENTON) PHASE cN -u 60 C C) S. 40 Cl 2O O O 2O 4-O SO BO 1 OO 12O Minutes EGUREC 13 U.S. Patent Aug. 3, 1993 Sheet 9 of 11 5,232,484 1.O O.8 O.6 O.4 O.2 Minutes EIGRE 4. Minutes FIGUREC 4A U.S. Patent Aug. 3, 1993 Sheet 10 of 11 5,232,484 Minutes EIGRE 4B Fe, slow OdditionO of H2O2 O.O O.5 O 1.5 2.O 2.5 3.0 Hours FIECGUREC 15 U.S. Patent Aug. 3, 1993 Sheet 11 of 11 5,232,484 1 O O O & b 14c in solution E 80 O S; V CD O h W A- SO Q Atrazine, s C S 4O CC O G) 2 CD 1. Time (h) ECG REC 6 5,232,484 1 2 Iron hydroxide finely dispersed on inorganic supports DEGRADATION OF PESTCDES BY FERRC that are unreactive to HO, including silica and mont REAG ENTS AND PEROXDE IN THE PRESENCE morillonite clay, have been disclosed to improve the OF LIGHT efficiency of waste water treatments using H2O2 (Mill, T., and Haag, W. R., Preprints of Extended Abstracts, BACKGROUND OF THE INVENTION 198th Nat. Meeting Amer. Chem. Soc., Div. Env. This invention relates to the degradation of organic Chen., A.C.S., Washington, 1969, paper 155, pp. pesticides, notably aromatic compounds such as chlori 342-345). Phenol has been photocatalytically oxidized nated aromatics, by ferric reagents to form inorganic in the presence of hydrogen peroxide and titanium diox Wastes. 10 ide powders in the presence and absence of ferric ions Chlorinated hydrocarbon, organophosphorus, or (Wei, T.Y., et al., J. Photochen. Photobiol. A. Chem, 55: ganonitrogen, organometallic, and the like pesticide 115-126 (1990). Dilute aqueous formaldehyde waste compounds number among the hazardous wastes that solutions have been neutralized by ferric chloride and require special methods for disposal because of their hydrogen peroxide in a process developed for treating toxic, refractory, or persistent properties. Many of these 15 Bureau of Reclamation reverse osmosis desalting mem compounds that do not degrade pose a threat to biota brane storage solutions (Murphy, A. P., et al., 23 Envi and/or human populations. Concern about the potential ron. Sci Technol. 166-169 (1989). However, Barbeni, hazards associated with the compounds has resulted in M., et al., found the addition of ferric ions instead of numerous recent laws and policies that require the ferrous inconsequential in the chemical degradation of cleanup of contaminated soil, sediments, surface water, 20 chlorophenols by Fenton's reagent (16 Chemosphere and wastewater. 2225-2237 (1987) at 2229 and FIG. 4 on 2232). A number of disposal techniques have been suggested SUMMARY OF THE INVENTION for various types of these toxic chemicals (see reviews It is an object of the present invention to provide a by Munnecke, D. M., 70 Residue Rev. 1-26 (1979) and 25 new method for degrading pesticides. It is another ob Ehart, O.R., 1985 National Workshop on Pesticide Waste ject of the present invention to provide a method for Disposal Proceedings EPA/600/9-85/030, pages 2 to 11 decontaminating equipment. It is a further object of the . Physical methods include entrapment, burial, adsorp present invention to provide a degradation method that tion, flocculation, and the like (reviewed by Nye, J. C., employs environmentally benign and inexpensive rea 1985 National Workshop on Pesticide Waste Disposal 30 gents and equipment, and yields virtually complete Proceedings, cited above, pages 43 to 480); an example is mineralization of the pesticides. the activated charcoal detoxification of pesticides dis These and other objects are achieved by the present closed by Scott in U.S. Pat. No. 4,585,753. Chemical invention, which describes methods of degrading pesti methods include oxidation, reduction, hydrolysis, con cides of the type having a formula containing more than jugation, irradiation, and the like (reviewed by Honey 35 one carbon atom, notably aromatics, under mild condi cutt, R. C., 1985 National Workshop on Pesticide Waste tions using ferric reagents. Preferred embodiments Disposal Proceedings, cited above, pages 72 to 85); exam achieve substantial mineralization of the pesticides by ples include incineration (discussed by Ferguson, T. L., contacting them in an oxygenated acidic aqueous solu and Wilkinson, R. R., in Krueger, R. F., and Seiber, J. tion with ferric ion in an amount and for a time effective N., eds., Treatment and Disposal of Pesticide Wastes, to achieve substantial mineralization. Degradations con ACS, 1984, chapter 11, pages 181 to 191), thiosulfate ducted in the dark require an oxidizing agent such as a oxidation using hydrogen peroxide and copper dis peroxide; hydrogen peroxide is preferred.
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