Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1992-10-09
1994-03-15
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
20415821, 588205, 588223, 588227, 210748, C07B 6300
Patent
active
052943151
ABSTRACT:
A system for decontaminating the contaminated fluid by using photocatalytic particles. The system includes a reactor tank for holding the contaminated fluid and the photocatalytic particles suspended in the contaminated fluid to form a slurry. Light irradiates the surface of the slurry, thereby activating the photocatalytic properties of the particles. The system also includes stirring blades for continuously agitating the irradiated fluid surface and for maintaining the particles in a suspended state within the fluid. The system also includes a cross flow filter for segregating the fluid (after decomposition) from the semiconductor powder. The cross flow filter is occasionally back flushed to remove any semiconductor powder that might have caked on the filter. The semiconductor powder may be recirculated back to the tank for reuse, or may be stored for future use. A series of such systems may be used to gradually decompose a chemical in the fluid. Preferably, the fluid is pretreated to remove certain metal ions which interfere with the photocatalytic process. Such pretreatment may be accomplished by dispersing semiconductor particles within the fluid, which adsorb ions or photodeposit the metal as the free metal or its insoluble oxide or hydroxide, and then removing the semiconductor particles together with the adsorbed metal ions/oxides/hydroxide/free metal from the fluid. A method of decontaminating a contaminated fluid is also disclosed.
REFERENCES:
patent: 4264421 (1981-04-01), Bard et al.
patent: 4806514 (1989-02-01), Langford et al.
"The First International Conference on TiO.sub.2 Photocatalytic Purification and Treatment of Water and Air", Abstracts, Nov. 8-13, 1992, Ontario, Canada.
"Hal Link's Talk at the Bidder's On Innovative Reactor Subcontract", Solar Energy Research Institute, Nov. 8, 1990, p. 1.
J. V. Anderson, "Development of U.S. Solar Detoxification Technology: An Introduction", Solar Energy Research Institute, pp. 2-5.
P. Pitchford, "Solar System Cleans Up Groundwater in California", National Renewable Energy Laboratory NREL LabTalk, p. 3.
T. Matsunage, et al., "Photoelectrochemical Sterlization of Microbial Cells by Semiconductor Powders," 1985, Federal of European Microbiological Societies.
J. H. Carey, et al., "The Photochemical Treatment of Waste Water by Ultraviolet or Radiation of Semiconductors," National Water Research Institute, Environmental Contaminants Division, Canada Centre for Inland Waters, Burlington, Ontario, Canada, 1980.
Cooper Gerald
Ratcliff Matthew A.
Delacroix-Muirheid C.
Niebling John
Photo-Catalytics, Inc.
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