# US 2016/0257585 A1 · Method for treating soil-contaminating water using photocatalytic material

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- Number: US 2016/0257585 A1
- Document ID: US20160257585A1
- Status: Published application
- Kind: A1
- Application number: 14/892,434
- Filed: 2013-06-28
- Published: 2016-09-08
- Earliest claimed: 2013-06-28
- Assignees: Showa Corporation
- Applicants: Showa Co., Ltd.
- Inventors: Teruki Takayasu; Teruo Arai; Kinji Onoda
- Web page: https://patentgrep.com/patent/US20160257585A1

## CPC

- C02F 1/725: {by catalytic oxidation}
- B01D 1/14: with heated gases or vapours {or liquids} in contact with the liquid
- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01D 53/8662: {Organic halogen compounds}
- B01D 53/8687: {Organic components}
- B01D 53/885: {Devices in general for catalytic purification of waste gases}
- B01J 21/063: {Titanium; Oxides or hydroxides thereof}
- B01J 35/39: Photocatalytic properties
- B01J 37/348: {Electrochemical processes, e.g. electrochemical deposition or anodisation}
- C02F 1/20: by degassing, i.e. liberation of dissolved gases (degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D)
- C02F 1/283: {using coal, charred products, or inorganic mixtures containing them}
- C02F 1/32: with ultraviolet light
- B01D 53/72: Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
- B01D 53/88: Handling or mounting catalysts
- B01D 2253/102: Carbon
- B01D 2255/20707: Titanium
- B01D 2255/702: Carbon
- B01D 2255/802: Photocatalytic
- B01D 2257/2064: Chlorine
- B01D 2257/7027: Aromatic hydrocarbons
- B01D 2259/804: UV light
- C02F 1/4678: {of metals}
- C02F 2101/20: Heavy metals or heavy metal compounds
- C02F 2101/322: {Volatile compounds, e.g. benzene}
- C02F 2101/36: containing halogen
- C02F 2103/06: Contaminated groundwater or leachate
- C02F 2305/10: Photocatalysts
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

## Abstract

The present invention provides a novel method for treating soil-contaminated water, the method using a photocatalytic material capable of efficiently removing, by light irradiation alone, volatile organic compounds and heavy metals that give rise to soil contamination. The present invention provides a method for treating soil-contaminated water that detoxifies volatile organic compounds contained in soil-contaminated, water using a photocatalytic material, the method being characterized by including the steps of (1) subjecting the soil-contaminated water to a gas-liquid separation to obtain a gas phase, and (2) decomposing the volatile organic compounds contained in the gas phase obtained in step (1) using the photocatalytic material. The present invention further provides a method for treating soil-contaminated water using a photocatalytic material to remove heavy metals contained in the soil-contaminated water, the method being characterized, by including the steps of (1) subjecting the soil-contaminated water to a gas-liquid separation to obtain a liquid phase, and (2) removing the heavy metals contained in the liquid phase obtained in step (1) using the photocatalytic material.

## Claims

### Claim 1

A method for treating soil-contaminated water using a photocatalytic material to detoxify volatile organic compounds contained in the soil-contaminated water, the method comprising the steps of:
(1) subjecting the soil-contaminated water to a gas-liquid separation to obtain a gas phase, and
(2) decomposing the volatile organic compounds contained in the gas phase obtained in step (1) using the photocatalytic material.

### Claim 2

A method for treating soil-contaminated water using a photocatalytic material to remove heavy metals contained in the soil-contaminated water, the method comprising the steps of:
(1) subjecting the soil-contaminated water to a gas-liquid separation to obtain a liquid phase, and
(2) removing the heavy metals contained in the liquid phase obtained in step (1) using the photocatalytic material.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the photocatalytic material has a crystalline titanium oxide film obtained by forming titanium nitride on the surface of titanium metal or a titanium alloy and then performing anodization.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the crystalline titanium oxide is anatase titanium oxide.

### Claim 5 (depends on 1)

The method according to claim 1, wherein when undecomposed volatile organic compounds remain in the gas phase after step (2), the method further comprises a step of:
(3) subjecting the volatile organic compounds in the gas phase to a secondary treatment by using at least one method selected from the group consisting of a method of removal by adsorption with activated carbon and a method of removal by thermal oxidation.

### Claim 6 (depends on 2)

The method for treating soil-contaminated water using a photocatalytic material according to claim 2, or wherein when unremoved heavy metals remain in the liquid phase after step (2), the method further comprises a step of:
(3) subjecting the heavy metals in the liquid phase to a secondary treatment by using at least one method selected from the group consisting of a method of removing heavy metals by electrolytic treatment, a method of insolubilizing heavy metals by chemical chelation, and a method of separating heavy metals by hydroxylation treatment.

### Claim 7

A soil-contaminated water treatment device for detoxifying volatile organic compounds contained in soil-contaminated water using a photocatalytic material, the device comprising a gas phase-production chamber for subjecting the soil-contaminated water to a gas-liquid separation to obtain a gas phase, and a photocatalytic device for decomposing the volatile organic compounds contained in the gas phase using the photocatalytic material.

### Claim 8 (depends on 7)

The soil-contaminated water treatment device according to claim 7, comprising a secondary treatment chamber for treating the volatile organic compounds in the gas phase by using at least one method selected from the group consisting of a method of removal by adsorption with activated carbon and a method of removal by thermal oxidation.

### Claim 9

A soil-contaminated water treatment device for detoxifying heavy metals contained in soil-contaminated water using a photocatalytic material, the device comprising a liquid phase-production chamber for subjecting the soil-contaminated water to a gas-liquid separation to obtain a liquid phase and a photocatalytic device for removing the heavy metals in the liquid phase using the photocatalytic material.

### Claim 10 (depends on 9)

The soil-contaminated water treatment device according to claim 9, comprising a secondary treatment chamber for treating the heavy metals in the liquid phase by using at least one method selected from the group consisting of a method of removing heavy metals by electrolytic treatment, a method for insolubilizing heavy metals by chemical chelation, and a method of separating heavy metals by hydroxylation treatment.