Water treatment apparatus and water treatment method

Inactive Publication Date: 2019-10-24
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an improved method for removing ions from treatment target water using electrodes that have multiple flowable granular electrode members. This approach ensures better removal of biofilm and scale from the electrodes, resulting in higher efficiency of the treatment process.

Problems solved by technology

However, merely alternately repeating application and short-circuit / reverse connection between both collector electrodes as in Patent Document 1 cannot prevent reduction in desalination efficiency due to biofilm or scale adhered to the surfaces of the electrodes while desalination is performed.
In addition, performing only sterilization by ozone and alternate change of the polarities of the electrodes as in Patent Document 2 can remove biofilm and / or scale to a certain extent, but cannot remove biofilm and / or scale strongly adhered or fixed to the surfaces of the electrodes, and there is a possibility that such biofilm and / or scale remains on the surfaces of the electrodes.

Method used

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  • Water treatment apparatus and water treatment method
  • Water treatment apparatus and water treatment method
  • Water treatment apparatus and water treatment method

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0028]FIG. 1 is a configuration diagram of a water treatment apparatus according to embodiment 1 of the present invention. A water treatment apparatus 100 includes: a water treatment unit 1 having an inlet port 1a through which treatment target water flows in, an outlet port 1b through which desalinated water flows out, and a washing water inlet port 1c through which washing water or additive containing washing water flows in at the time of reverse washing, the water treatment unit 1 being configured to perform desalination for the treatment target water; a raw water tank 2 which is connected to the water treatment unit 1 via a treatment target water measurement unit 11, a treatment target water supply valve 5, and then a treatment target water supply pump 3, and which stores treatment target water; a treated water tank 15 which is connected to the water treatment unit 1 via a desalinated water measurement unit 12 and then a desalinated water sending valve 7 and which stores treatme...

specific examples

[0065]Hereinafter, the present invention will be further described using examples. In the examples, water obtained by filtering urban sewage water having electric conductivity of 2 mS / cm and DOC of 10 mg / L was used as treatment target water. Granular activated carbon was used as the first granular electrode member 18 and the second granular electrode member 19, and the amount of the activated carbon is 10 L. The flow speed of the treatment target water in the desalination step was 0.1 m / min, and the flow speeds of the washing water in the reverse washing step and the additive containing washing water in the addition reverse washing step were 0.5 m / min. A hydrogen peroxide solution was used as the additive, and the hydrogen peroxide concentration in the additive containing washing water was 1%.

example 1

[0066]Under the above condition of the treatment target water, the activated carbon amount, and the flow speed, the desalination step and the reverse washing step were executed for eight cycles. In example 1, the addition reverse washing step was not executed. As a result of inspection in example 1, the following table 1 was obtained.

TABLE 1FirstSecondThirdFourthFifthSixthSeventhEighthCycletimetimetimetimetimetimetimetimeIon removal rate (%)7066616058565352when desalination stepwas finishedReduction width (%) of—491012141718ion removal rate fromwhen first-timedesalination step wasfinished

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Abstract

A water treatment apparatus includes: a first granular electrode member and a second granular electrode member stored in a water treatment unit and provided so as to be separated from each other; a power supply unit which applies voltage between the first granular electrode member and the second granular electrode member so that ions contained in treatment target water supplied from one side of the water treatment unit are adsorbed to the first granular electrode member and the second granular electrode member; and a washing water supply pump which causes washing water to flow from the other side of the water treatment unit to the one side of the water treatment unit, thereby washing the first granular electrode member and the second granular electrode member, wherein the first granular electrode member and the second granular electrode member each include a plurality of flowable granular electrode members.

Description

TECHNICAL FIELD[0001]The present invention relates to a water treatment apparatus and a water treatment method for treating treatment target water using an electrical double layer capacitor.BACKGROUND ART[0002]Electric desalination technology using an electrical double layer capacitor is technology of adsorbing and removing ions contained in treatment target water such as sea water or contaminated water using a Coulomb force, thereby desalinating the treatment target water. In one example of conventional electric desalination, an electrical double layer capacitor having a flat-plate shape is configured such that activated carbon layers mainly formed from activated carbon having a high specific surface area are provided on both sides of a separator formed from an electrically-insulating porous liquid-permeable sheet, collector electrodes are provided on the outer sides of the activated carbon layers, and holder plates are provided on the outer sides of the collector electrodes. Then,...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/48C02F1/46B01D35/16
CPCC02F2001/46119C02F1/4608C02F2001/46161C02F1/48C02F1/46109B01D35/16C02F1/46114C02F1/4604C02F2209/005C02F2209/006C02F2201/46115C02F2001/46152
InventorNAKAYAMA, YOSHIHIROYAMAUCHI, TOKIKOYASUNAGA, NOZOMUNODA, SEIJI
OwnerMITSUBISHI ELECTRIC CORP