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Water treatment method and water treatment device

A water treatment device and water treatment technology, applied in water treatment parameter control, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as difficult filtration, pore clogging and easy clogging, and achieve long-term stability filter effect

Pending Publication Date: 2018-04-17
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the accumulation of fouling substances on the membrane surface during filtration, the pores are clogged, and there is a problem that filtration becomes difficult.
In particular, hydrophobic organic membranes have a high affinity with hydrophobic fouling substances contained in the water to be treated, are prone to clogging, and are difficult to perform stable filtration over a long period of time.

Method used

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  • Water treatment method and water treatment device
  • Water treatment method and water treatment device
  • Water treatment method and water treatment device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0035] figure 1 It is a figure which shows the structure of the whole water treatment system at the time of applying the water treatment apparatus concerning Embodiment 1 of this invention to the immersion-type membrane separation activated sludge method. figure 1 The water treatment apparatus included in the water treatment device includes a water-to-be-treated introduction pipe 1 for introducing the water to be treated into the biological treatment tank 4 , and an air introduction pipe 2 for blowing air into the biological treatment tank 4 . The air introduction pipe 2 is connected to an air diffuser 3 .

[0036] It is installed so that the activated sludge 26 is accumulated in the biological treatment tank 4, and the separation membrane 5 is immersed in the activated sludge 26 separately. The separation membrane 5 is connected to a permeate transfer pipe 6 . Furthermore, a valve 20 and a membrane filtration pump 7 are provided on the permeate transfer pipe 6 .

[0037] I...

Embodiment approach 2

[0123] In Embodiment 2, a description will be given of a water treatment device capable of eliminating unnecessary washing with ozone and achieving suppression of the amount of ozone used.

[0124] Figure 5 It is a figure which shows the structure of the whole water treatment system at the time of applying the water treatment apparatus concerning Embodiment 2 of this invention to the immersion-type membrane separation activated sludge method. In this Embodiment 2 Figure 5 As far as the composition is concerned, it is the same as that in the previous Embodiment 1 figure 1 Compared with the configuration of the permeate water transfer pipe 6, the membrane property detector 24 and the inter-membrane pressure difference detector 25 are also different. Therefore, the following description will mainly focus on these differences.

[0125] In the present invention, as described in detail in Embodiment 1 above, ozone is brought into contact with the separation membrane 5 to modify...

Embodiment 2

[0174] The first time Q per unit membrane area becomes 600mgO 3 / m 2 To set the ozone water concentration C, the ozone water flow rate F, and the ozone injection time Ti to clean the separation membrane 5. Then, the ozone injection amount Q is kept constant, only the ozone injection time Ti is changed, and the cycle of filtration and cleaning is repeated.

[0175] After this cycle was repeated five times, the membrane was taken out from the tank, and the surface of the separation membrane 5 was washed with tap water. Next, the separation membrane 5 was moved into a water tank filled with ultrapure water, and the pressure difference of the clean water filtration at a water temperature of 25° C. was measured. By performing the verification according to this Example 2, the results in Table 2 below were obtained.

[0176] [Table 2]

[0177]

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PUM

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Abstract

The invention relates to a water treatment method and a water treatment device. In this water treatment method, a cycle is repeatedly performed including a filtration process for filtering water to betreated through a separation membrane from the primary side toward the secondary side thereof, and a backwashing process for backwashing the separation membrane from the secondary side toward the primary side. The water treatment method comprises a step for injecting ozone for use in the backwashing step into the separation membrane, and, when a preceding cycle of the repeated cycle is defined asa first cycle and a following cycle performed after the first cycle is defined as a second cycle, a step for setting the amount of ozone injected in the second cycle to be less than or equal to the amount of ozone injected in the first cycle.

Description

technical field [0001] The present invention relates to a water treatment technology using a membrane, and in particular to a water treatment method and a water treatment device including cleaning treatment for modifying a hydrophobic membrane. Background technique [0002] In water treatment such as water supply treatment and sewage treatment, solid-liquid separation technology for separating polluted substances contained in to-be-treated water from the to-be-treated water to obtain clarified treated water is widely performed. [0003] For example, as the solid-liquid separation technology, there is a coagulation-sedimentation technology in which a coagulant is added to the water to be treated to coagulate the dirty substances contained in the water to be treated, and to separate by gravity sedimentation; Pressurized flotation technology that injects microbubbles, adsorbs aggregates to microbubbles, and floats them up to separate them. [0004] However, these technologies ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44B01D65/06
CPCC02F1/44B01D65/02B01D2321/04B01D2321/168B01D2325/38C02F3/1273C02F2209/03C02F2209/23C02F2303/16Y02W10/10B01D69/02C02F1/008
Inventor 今村英二山内登起子安永望
Owner MITSUBISHI ELECTRIC CORP
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