Process and apparatus for the decomposition of organochlorine solvent contained in water

• US 5,330,661 A
• Filed: 08/17/1992
• Issued: 07/19/1994
• Est. Priority Date: 10/18/1991
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Tateishi, Kazuo, Okuda, Taneaki
• Primary Examiner(s): McCarthy, Neil
• Application Number:
  US07/885,673
• Time in Patent Office: 701 Days
• Field of Search: 210/748, 210/760, 210/763
• US Class Current: 210/748.14
• CPC Class Codes: C02F 1/325 Irradiation devices or lamp constructions
• CPC Class Codes: C02F 1/722 Oxidation by peroxides
• CPC Class Codes: C02F 1/725 by catalytic oxidation
• CPC Class Codes: C02F 1/78 with ozone C02F1/4672 takes precedence
• CPC Class Codes: C02F 2201/3223 Single elongated lamp located on the central axis of a turbular reactor
• CPC Class Codes: C02F 2201/3228 Units having reflectors, e.g. coatings, baffles, plates, mirrors

Abstract

An organochlorine solvent contained in water is decomposed by adding at least one of hydrogen peroxide and ozone to the water and then radiating ultraviolet rays to the water. According to the invention, a catalytic amount of a water-insoluble barium titanate substance is caused to co-exist in the water.

Claims

1. A process for decomposing an organochlorine solvent contained in water, said water and solvent being in a container having a circumference, said process comprising the steps of:

adding at least one of hydrogen peroxide and ozone to the water, the concentration of the hydrogen peroxide in said water being approximately 100-200 mg/l, and the ozone being present in a concentration of up to approximately 50 mg/l, and radiating ultraviolet rays into said water from all directions outside the entire circumference, which comprises causing a catalytic amount of a water-insoluble barium titanate to co-exist in the water.

2. The process of claim 1, wherein the organochlorine solvent is methylchloroform.

3. The process of claim 1 and the added step prior to said ultraviolet radiation of dispersing a barium titanate powder in said water and solvent, the concentration of said power being in the range of 0.01 wt % based on the contaminated water.

4. A process for decomposing an organochlorine solvent contained in water, said solvent and water being in a manner that it may be exposed to light from different angles, said process comprising the steps of:

stirring said solvent and water;

adding during said stirring of said solvent and water a water-insoluble barium titanate powder and at least one material taken from the group consisting of hydrogen peroxide, and ozone, said hydrogen peroxide having a concentration in said solvent and water in the order of 100-200 mg/l, said ozone present in a concentration in said solvent and water up to about 50 mg/l, and said water-insoluble barium titanate powder being present in an amount in the range of 0.01 wt % to 1 wt % based on the water containing the organochlorine solvent, and

radiating ultraviolet light into said mixture of solvent, water, and added material from said different angles.