JPH10225685A - Water purifying treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily discharge clogging material in a filter membrane to lower the replacement frequency of an expensive fitter membrane in a water treatment facility equipped with a membrane filter in the poststage of an ozonization device by applying mechanical vibration to the membrane filter. SOLUTION: In a water treatment device suitably used when securing emergency treated water on disaster such as earthquake, water to be treated is subjected to oxidation reaction by an ozonization device 1 to remove organic matter in the water to be treated and decrease a load of a membrane filter 2 of the poststage. In the membrane filter 2, a filter membrane 2a is loaded into a tank, and the filtered water which has been treated there is discharged to a treatment tank 3. In this case, the membrane filter 2 is supported by springs 2b and mechanical vibration is applied to the filter membrane 2a by an excitor 4. And when the filter membrane 2a is clogged, clogging material is removed by backwashing, and at this time, an electric signal is given from an excitation power source/controller 5 to give mechanical vibration from the excitor 4, causing the clogging material to be easily removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a water purification apparatus.

[0002]

2. Description of the Related Art In a living environment, the use of water is indispensable. Therefore, it is required to secure emergency treated water at the time of drought or earthquake disaster. Conventionally, a seawater desalination apparatus, an emergency drinking water desalination apparatus, and the like have been put into practical use, and the main technology thereof is performed by membrane filtration.

[0003] Generally, it is known that the water purification method purifies by membrane filtration (filter device) as in the water purification method and apparatus disclosed in JP-A-6-23379.

[0004]

In the conventional membrane filtration device, various types of organic substances contained in the input water to be treated are used.
There was a drawback that clogging occurred with the filtration time and the expensive filtration membrane had to be replaced periodically.

[0005] An object of the present invention is to provide a water purification apparatus which does not require replacement of an expensive filtration membrane.

[0006]

The water purifying apparatus of the present invention is characterized in that water to be treated is decomposed into various kinds of organic substances by an oxidation reaction in an ozone treatment apparatus, and thereafter, hardly decomposable organic substances (pesticides and humic acids which cannot be oxidized by ozone). This is a device for filtering acids, etc.) with a membrane filtration device. As a device for backwashing the membrane filtration device, a unit for supplying backwash water and mechanical vibrations applied to the filtration membrane by a vibrator to filter the water in the filtration membrane. In other words, it is easier to discharge substances.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A purification treatment apparatus according to the present invention will be described with reference to FIGS.

FIG. 1 is an explanatory diagram of the basic configuration of the present invention.
The to-be-treated water is oxidized by the ozone treatment apparatus 1 to remove organic substances contained in the to-be-treated water to some extent, thereby reducing the burden of the filtration amount on the next membrane filtration apparatus 2. In the membrane filtration device 2, a filtration membrane 2 a housed in a tank is loaded, and filtered water is discharged to the next processing tank 3. In FIG. 1, three sets of membrane filtration devices 2 are illustrated.
Multiple sets are installed to increase the amount of filtered water.

Here, the membrane filtration device 2 is supported on a fixed object by a spring 2b, and mechanical vibration is applied by a vibrator 4 to apply mechanical vibration to the filtration membrane 2a in the tank. The vibrator 4 is controlled by giving an arbitrary mechanical vibration as an electric signal by a vibration power supply / control device 5.
When the treated water passes for a certain period of time, the filtration membrane 2a becomes clogged. If the clogged organic substances are removed by backwashing, the filtration membrane 2a has a function of passing water again (the amount of filtered water of the water to be treated at a constant pressure). ) Should recover. Therefore,
The backwash pump 6 allows the water to flow through the filtration membrane 2a from the direction opposite to the water flow direction to the membrane filtration device 2 as shown by the dotted line in the drainage tank 7
At this time, when an electric signal is given from the vibration power supply / control device 5 to give a mechanical vibration from the vibrator 4, the clogging material in the filtration membrane 2a is reduced by the water pressure of the backwash water and the power of the water flow. As a result of the simultaneous application of the force of the mechanical vibration in the perpendicular direction, an effect that the clogging substance in the filtration membrane 2a is easily discharged is generated.

FIG. 2 is a diagram for explaining the relationship between the vibrator 4 and the vibrating power supply / controller 5. The driving power is supplied from the power supply 5a to the driving coil 4a of the vibrator 4 via a cable by a power amplifier 5b. Upon injection, the movable armature part 4b generates mechanical vibration with a displacement δ up and down as shown. When a mechanical vibration pattern (vibration frequency f on the vertical axis and time t on the horizontal axis) is determined by the sweep control unit 5c, and a signal for repeatedly applying the mechanical vibration frequencies 0 to f is generated and supplied to the power amplifier 5b, the vibrator 4 Gives a mechanical vibration according to f. According to the experiment, it was found that algae and the like can be removed by the MF membrane (pore size: 0.1 to 1 μm), but the backwashing removal rate is improved by applying a sweep mechanical vibration of f = 40 Hz to 4 kHz together with the backwashing water. Accordingly, the interval control passage time of treated water in Figure 1 T ₁ and backwash time T ₂ are not shown, T ₁
If T = 10 days, T ₂ = 3 hours was experimentally good, but it depends on the amount of organic substances contained in the water to be treated, so it is natural that the interval time may be determined on a case-by-case basis.

FIG. 3 is an explanatory view of a modified example of the present invention. The membrane filtration device 2 is installed vertically to expose the filtration membrane 2a, and a fixed point is provided at the center by a spring 2b. Mechanical vibration is applied in the horizontal axis direction by the vibrator 4. The vibration power supply / control device 5 for mechanical vibration has the same function as that of FIG.

Therefore, the water passage of the water to be treated is raised by the backwashing pump 6 from the ozone treatment apparatus 1 to increase the valve V _1.
8a (three-way valve) reaches the treatment tank 3 from the lower side of the membrane filtration device 2 through the upper portion. Here, when backwashing, valve V ₁
8a (3-way valve) reaches from the upper side of the membrane filtration unit 2 to lower the driving and valve V ₂ is switched to the passage of the illustrated dotted line 8b (the three-way valve), discharge and open the valve S8c (solenoid valve) Discharge to water tank 7.

As a result, the organic matter adhering to the inside of the filtration membrane 2a is subjected to three forces of water flow, gravity and mechanical vibration, and has an effect of being easily discharged to the outside.

On the other hand, in FIG. 1, the membrane filtration device 2 is provided next to the ozone treatment device 1, but the water to be treated may directly enter the membrane filtration device 2 without the ozone treatment device 1. Since the ozone oxidation reaction of various organic substances contained in the treated water is omitted, the filter membrane 2a is easily clogged. In this case, the problem can be solved by shortening the backwashing interval time and forming a backwashing sequence before the clogging occurs in the filtration membrane.

[0015]

According to the present invention, there is provided an apparatus for purifying water by means of a membrane filtration apparatus for oxidizing and decomposing various organic substances contained in the water to be treated by an ozone treatment apparatus and physically removing residual organic substances. Then, mechanical vibration is given to the membrane filtration device by a vibrator, and backwash water can be simultaneously flowed to eliminate clogging of the filtration membrane. Therefore, a maintenance-free water purification device can be obtained, and running costs can be reduced.

[0016] In addition, since the mechanical vibration is controlled by sweeping by setting an arbitrary vibration frequency within a certain width, the mass and type of various substances in the filtration membrane are controlled.
Since the separation vibration from the membrane is given, it is easy to remove the clogging, so that the inside of the filtration membrane is cleaned and the initial state water-permeable function is easily restored.

Further, since the filter membrane is installed vertically and the backwash water flows from above to below and mechanical vibration is given from the horizontal direction, the force of the water flow, gravity and mechanical vibration force are simultaneously applied to the filter membrane. The inside of the filtration membrane becomes more clean, and it is easy to recover the initial water flow function.

As described above, since the replacement of the filtration membrane, which has conventionally been expensive in maintenance, is eliminated, the total cost is reduced and the economic efficiency is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a basic configuration of a water purification treatment device shown as an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a relationship between a vibrator and a vibration power supply / control unit.

FIG. 3 is an explanatory view of a modified example of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ozonation apparatus, 2 ... Membrane filtration apparatus, 2a ... Filtration membrane,
2b: spring, 3: treatment tank, 4: vibrator, 4a: drive coil section, 4b: movable armature section, 5: vibration power supply / control device, 6: backwash pump, 7: drain tank.

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Masamitsu Nakazawa 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Hitachi, Ltd. Kokubu Plant

Claims (3)

[Claims] In a water treatment facility provided with a membrane filtration device next to an ozone treatment device, the membrane filtration device is subjected to mechanical vibration by a vibrator. 2. A water purification apparatus characterized in that mechanical vibration is applied to a membrane filtration device by a vibrator, and when the backwash water passes, the mechanical vibration is changed and the frequency sweep is changed to repeatedly apply vibration. 3. A vertically installed membrane filtration device, which flows upward from below when purifying treated water, and flows downward from above when backwashing and cleaning the membrane filtration device. A water purification treatment device characterized by applying mechanical vibration by means of: