WATER TREATMENT METHOD AND WATER TREATMENT SYSTEM

• US 20180029907A1
• Filed: 11/10/2016
• Published: 02/01/2018
• Est. Priority Date: 12/22/2015
• Status: Abandoned Application

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: IKEDA, Keiichi, IDA, Kiyoshi, MORITA, Toru
• Application Number:
  US15/550,829
• Publication Number:
  US 20180029907A1
• Time in Patent Office: Days
• CPC Class Codes: B01D 2311/04 Specific process operations in the feed stream; Feed pretreatment
• CPC Class Codes: B01D 2311/12 Addition of chemical agents
• CPC Class Codes: B01D 2311/18 pH control
• CPC Class Codes: B01D 2311/2634 Oxidation
• CPC Class Codes: B01D 2311/2665 Aeration other than for cleaning purposes
• CPC Class Codes: B01D 61/04 Feed pretreatment
• CPC Class Codes: B01D 61/16 Feed pretreatment
• CPC Class Codes: B01D 63/06 Tubular membrane modules
• CPC Class Codes: C02F 1/44 by dialysis, osmosis or reverse osmosis general membrane separation processes B01D61/00, membrane modules B01D63/00, electrodialysis C02F1/4693, combination of membrane modules and bioreactors C02F3/1268
• CPC Class Codes: C02F 1/444 by ultrafiltration or microfiltration
• CPC Class Codes: C02F 1/5236 using inorganic agents
• CPC Class Codes: C02F 1/66 by neutralisation; pH adjustment for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58
• CPC Class Codes: C02F 1/722 Oxidation by peroxides
• CPC Class Codes: C02F 1/74 with air aeration of stretches of water C02F7/00
• CPC Class Codes: C02F 1/76 with halogens or compounds of halogens C02F1/4674 takes precedence
• CPC Class Codes: C02F 1/78 with ozone C02F1/4672 takes precedence
• CPC Class Codes: C02F 2101/203 Iron or iron compound
• CPC Class Codes: C02F 2101/32 Hydrocarbons, e.g. oil
• CPC Class Codes: C02F 2103/10 from quarries or from mining activities
• CPC Class Codes: C02F 2209/04 Oxidation reduction potential [ORP]
• CPC Class Codes: C02F 2209/06 : pH
• CPC Class Codes: C02F 2303/18 : Removal of treatment agents after treatment
• CPC Class Codes: C02F 9/00 : Multistage treatment of water, waste water or sewage

Abstract

A water treatment method according to the present invention is a water treatment method in which oil is membrane-separated from water to be treated containing the oil and ferrous ions, the water treatment method including an oxidation step of oxidizing the ferrous ions in the water to be treated, and a filtration step of membrane-filtering the water to be treated after the oxidation step. In the oxidation step, a pH of the water to be treated is adjusted to 6 to 9, and an oxidation-reduction potential of the water to be treated is adjusted to 450 to 750 mV.

Claims

1. :

A water treatment method in which oil is membrane-separated from water to be treated containing the oil and ferrous ions, the water treatment method comprising;

an oxidation step of oxidizing the ferrous ions in the water to be treated; and

a filtration step of membrane-filtering the water to be treated after the oxidation step,

wherein, in the oxidation step, a pH of the water to be treated is adjusted to 6 to 9, and an oxidation-reduction potential of the water to be treated is adjusted to 450 to 750 mV.

2. :

The water treatment method according to claim 1, wherein, in the oxidation step, ozone, chlorine, hydrogen peroxide, or hypochlorous acid is brought into contact with the water to be treated.

3. :

The water treatment method according to claim 1, further comprising an aeration step of aerating the water to be treated after the oxidation step.

4. :

The water treatment method according to claim 3, wherein the aeration is performed by using air or nitrogen gas.

5. :

The water treatment method according to claim 3, wherein, in the aeration step, the pH of the water to be treated is adjusted to 6 to 9, and the oxidation-reduction potential of the water to be treated is adjusted to 0 to 300 mV.

6. :

A water treatment system in which oil is membrane-separated from water to be treated containing the oil and ferrous ions, the system comprising;

oxidation equipment configured to oxidize the ferrous ions in the water to be treated; and

a filtration apparatus configured to membrane-filter the water to be treated which has been oxidized,

wherein the oxidation equipment has a mechanism to adjust a pH of the water to be treated to 6 to 9 and an oxidation-reduction potential of the water to be treated to 450 to 750 mV.