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Water treatment method and water treatment apparatus each using membrane

A water treatment device and water treatment technology, applied in water/sewage treatment, water treatment parameter control, biological water/sewage treatment, etc., can solve problems such as inability to remove chemical attachments, achieve energy saving, improve cleaning effect, The effect of reducing the aeration air volume

Active Publication Date: 2016-11-16
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a backwash method, if it is physically clogged, it can be backwashed with clear water such as filtered water (filtered water) or tap water, but it cannot remove the attachments chemically bonded to the membrane surface or inside the membrane.

Method used

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  • Water treatment method and water treatment apparatus each using membrane
  • Water treatment method and water treatment apparatus each using membrane
  • Water treatment method and water treatment apparatus each using membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0065] figure 1 It is a block diagram showing Embodiment 1 of the present invention. In the configuration of the present embodiment, the membrane filtration separation device 2 is immersed in the water tank 1 to be treated, and is connected to the switching valve 10 through the membrane connection pipe 11 . The switching valve 10 is branched into a filtered water piping 12 and an ozone water piping 14 , the filtered water piping 12 is connected to the switching valve 10 , and the filtering pump 7 is located on the piping path of the filtered water piping 12 . Moreover, the ozone mixing tank 5 which is an ozone dissolving part is connected to the ozone water piping 14. As shown in FIG. A washing water tank 3 is connected to the upstream side of the ozone mixing tank 5 through a washing water pipe 13 , and a washing water supply pump 8 is located on the washing water pipe 13 between the ozone mixing tank 5 and the washing water tank 3 . And the ozone generator 4 which is an oz...

Embodiment approach 2

[0109] Figure 8 It is a block diagram showing an example of Embodiment 2 of the present invention. right image 3 The following structures are added. An ozone gas storage tank 17 capable of storing ozone gas is provided between the ozone generator 4 and the ozone mixing tank 5 through the ozone gas piping 16 . Furthermore, the ozone gas storage tank 17 and the ozone generator 4 are connected via an oxygen pipe 18 .

[0110] Next, the operation will be described. During backwashing, the ozone gas produced by the ozone generator 4 using oxygen as a raw material is transported to the ozone gas storage tank 17 through the ozone gas pipeline 16, and is stored in the ozone gas storage tank 17 by being adsorbed on an adsorbent such as silica gel at a low temperature. As indicated by symbol G in the drawing, oxygen-containing gas is supplied to the ozone generator 4, and in this example, it is more preferable to supply oxygen gas generated from liquid oxygen than to supply oxygen...

Embodiment approach 3

[0131] Figure 12 It is a block diagram showing an example of Embodiment 3 of the present invention. right image 3 The following structures are added. The acid storage tank 19 is connected to the ozone water pipe 14 through an acid supply pipe 21 . Furthermore, an acid supply pump 20 is provided on an acid supply pipe 21 between the acid storage tank 19 and the ozone water pipe 14 .

[0132] Next, the operation will be described. During backwashing, when the ozone cleaning water is supplied to the membrane filtration separation device 2, the acid in the acid storage tank 19 is supplied to the ozone cleaning water in the ozone water piping 14 through the acid supply piping 21 by the acid supply pump 20 at the same time to generate acidic water. Ozone cleans the water, and backwashes the membrane filtration separation device 2. It is also possible to install a static mixer or the like at a position downstream of the point where the acid is injected into the ozone water pip...

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PUM

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Abstract

Ozone washing water is produced by injecting an ozone gas into washing water which is filtrated water produced by filtrating untreated water through a membrane, is pressurized and can be used for backwashing, and then the ozone washing water is supplied to a membrane from a secondary filtration side to remove fouling substances present in the membrane and to generate ozone-containing bubbles on a primary filtration side to remove fouling substances present on the primary filtration side surface of the membrane.

Description

technical field [0001] The invention relates to a water treatment method and a water treatment device using membranes for membrane filtration and treatment of purified water, industrial water, sewage, sewage secondary treatment water, factory wastewater, seawater, urine and feces, etc., especially related to membranes Cleaning method and device. Background technique [0002] When water is subjected to membrane filtration treatment to remove foreign substances in the water, if the treatment is continued, the membrane is clogged, the pressure of filtration increases, and the amount of filtered water decreases. Here, the foreign matter is a general term for all foreign matter separated from the membrane filtration water by the membrane filtration treatment during the membrane filtration treatment, such as sludge (hereinafter the same) as a microbial mass, and SS (abbreviation for Suspended Solid in the treated water, Suspended solids. The same applies hereinafter) and the like...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06
CPCB01D2321/16B01D2321/162C02F1/444C02F1/78C02F3/1273C02F2209/03C02F2303/14C02F2303/20B01D65/02Y02W10/10B01D2321/04C02F1/44C02F2303/16
Inventor 安永望古川诚司
Owner MITSUBISHI ELECTRIC CORP
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