Hollow fiber immersed membrane module and use method thereof

Abstract

The invention belongs to the field of separation, and particularly relates to a hollow fiber immersed membrane module and a use method thereof.The membrane module comprises a membrane tow, an air inlet end and a water production end, and the air inlet end and the water production end are arranged at the two ends of the membrane tow respectively; the air inlet end comprises an air inlet end head, an air inlet pouring end arranged in the air inlet end head and a pulse aerator; the pulse aerator comprises an aeration chamber and an aeration head arranged in the aeration chamber; and the air inlet end is connected with the aeration chamber in a sliding manner. According to the hollow fiber immersed membrane module, due to the special structural design, membrane tows are in an open and loose state during aeration, the gas scrubbing effect is greatly improved, and pollutant discharge in the aeration process is facilitated; the hollow fibers are in a natural drooping state during non-aeration, so that the improvement of water production efficiency is facilitated, and the loss of the area of the filtering membrane caused by the attachment of the hollow fiber membrane filaments is avoided.

Description

Technical Field

[0001] The invention belongs to the field of separation, and in particular relates to a hollow fiber immersed membrane component and a use method thereof. Background Art

[0002] With the widespread application of membrane technology in the field of water treatment, hollow fiber separation membrane technology is widely used in municipal drinking water treatment, municipal recycled water treatment, municipal sewage treatment and industrial wastewater treatment, and in most of these fields, submerged membrane technology and membrane components are chosen. Therefore, how to reduce the pollution rate of membrane components during use, provide the cleaning effect of membrane components, and extend the service life of membrane components is crucial to the promotion and application of membrane technology in the field of water treatment. In the prior art, compressed air is generally used for air scrubbing to control the pollution of membrane components, and the gas-liquid two-phase flow generated by continuous aeration is used to flush and remove the activated sludge attached to the surface of the hollow fiber.

[0003] At present, the existing submerged hollow fiber membrane components, whether with or without a shell, are mostly fixed at both ends. The hollow fibers between the two ends have a certain degree of redundancy, generally 10-50mm, with the lower end as the aeration end and the upper end as the water production end. This method achieves the flushing effect of aeration on the hollow fiber membrane filaments because of the certain redundancy, but it cannot solve the problem of straightening the hollow fiber membrane filaments after shrinkage. The upper end of the partially submerged hollow fiber membrane component is fixed, and the lower end is a free end. Although this method solves the problem of membrane filament straightening caused by membrane filament shrinkage, we hope that the hollow fiber of the hollow fiber membrane is in a natural drooping state during normal water production, and the hollow fiber has greater redundancy during aeration, so that it is in a fluffy state, which is more conducive to the discharge of pollutants during aeration. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a hollow fiber submerged membrane module and a method for using the same.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A hollow fiber immersed membrane module comprises a membrane bundle, an air inlet end and a water production end respectively arranged at both ends of the membrane bundle; the air inlet end comprises an air inlet head, an air inlet casting end arranged in the air inlet head, and a pulse aerator; the pulse aerator comprises an aeration chamber and an aeration head arranged in the aeration chamber; the air inlet head is slidably connected to the aeration chamber.

[0007] The air inlet end and the aeration chamber are provided with sliding grooves correspondingly; and limiting blocks are respectively provided on the sliding grooves.

[0008] The aeration head comprises a U-shaped aeration outer tube and an aeration inner tube; the air inlet casting end is provided with a channel for accommodating the aeration inner tube.

[0009] A support frame is arranged between the air inlet end and the water production end.

[0010] The lower end of the membrane bundle is sealed inside the air inlet casting end.

[0011] The water production end comprises a water production end shell and a water production casting end arranged in the water production end; the upper end of the membrane bundle exposes the water production casting end and is connected to the water production shell.

[0012] The present invention also includes a method for using the hollow fiber immersed membrane assembly, comprising the following steps: 1) installing the hollow fiber immersed membrane assembly; 2) introducing compressed air into a pulse aerator, the pulse aerator collects compressed air and moves freely upward along a slide rail under the action of buoyancy, and changes the membrane bundle from a gathered state to an open and loose state; 3) when the air inlet end and the pulse aerator move to the limit block, the compressed air is filled to reduce the liquid level in the pulse aerator to the pulse liquid level height, under the action of siphon, all the compressed air collected in the pulse aerator is instantly released to perform air scrubbing on the hollow fiber membrane; 4) as the compressed air in the pulse aerator is completely released, in the pulse aerator, the air inlet end sealant and the membrane bundle return to a natural drooping state under the action of gravity; 5) as the compressed air continues to enter the pulse aerator, the process of steps 2)-4) is repeated.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] Due to its special structural design, the hollow fiber submerged membrane component of the present invention can achieve that the membrane fiber bundle is in an open and loose state during aeration, which greatly improves the air scrubbing effect and utilizes the discharge of pollutants during the aeration process; when not aerated, the hollow fibers are in a naturally drooping state, which is beneficial to improving the water production efficiency and avoiding the loss of filtration membrane area due to the adhesion between the hollow fiber membrane fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the hollow fiber submerged membrane module of the present invention;

[0016] Figure 2 It is a cross-sectional view of the hollow fiber submerged membrane module of the present invention;

[0017] Figure 3 Schematic diagram of the initial state of the hollow fiber submerged membrane module of the present invention;

[0018] Figure 4It is a schematic diagram of the floating state of the hollow fiber submerged membrane module of the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and the best embodiments.

[0020] Figure 1-4 A hollow fiber immersed membrane assembly is shown, comprising a membrane bundle 3, an air inlet end and a water production end 1 respectively arranged at both ends of the membrane bundle; the air inlet end comprises an air inlet head 2, an air inlet casting end 6 arranged in the air inlet head, and a pulse aerator 5; the pulse aerator comprises an aeration chamber and an aeration head arranged in the aeration chamber; the air inlet head is slidably connected to the aeration chamber.

[0021] The air inlet end and the aeration chamber are provided with sliding grooves correspondingly; the sliding grooves are provided with limit blocks ( Figure 3 H1, H2 positions).

[0022] The aeration head comprises a U-shaped aeration outer tube and an aeration inner tube; the air inlet casting end is provided with a channel for accommodating the aeration inner tube.

[0023] A support frame 4 is provided between the air inlet end and the water production end, and the support frame 4 can be connected with a shell or without a shell.

[0024] The lower end of the membrane bundle is sealed inside the air inlet casting end.

[0025] The water production end 1 includes a water production end shell and a water production casting end 7 arranged in the water production end; the upper end of the membrane bundle exposes the water production casting end and is connected to the water production shell. The upper end of the membrane bundle 3 formed by the plurality of hollow fiber membranes is fixed in the water production casting end 7, and the upper end of each hollow fiber membrane opens to the outer end surface of the water production casting end 7, thus forming the water production end 1 of the hollow fiber submerged membrane module of the present invention;

[0026] The water production channel of the technical solution of the present application is as follows: the raw water enters the internal hollow channel of the membrane bundle through the outside of the membrane bundle, the raw water is filtered by the membrane, and the filtered water enters the water production end shell of the water production end from the hollow channel. The aeration channel is for compressed gas to enter the pulse aerator and be released into the membrane bundle through the siphon effect of the aeration head.

[0027] A method for using the hollow fiber submerged membrane module comprises the following steps:

[0028] 1) Install the hollow fiber submerged membrane module; 2) Pass compressed air into the pulse aerator, the initial state Figure 3 As shown, the pulse aerator collects compressed air and moves freely upward along the slide rail under the action of buoyancy, and changes the membrane bundle from a gathered state to an open loose state ( Figure 4 3) When the air inlet end and the pulse aerator move to the limit block, that is, Figure 4 It is shown that H1 of the air inlet end 2 coincides with H2 of the pulse aerator 5 and realizes the limit function. When the compressed air is filled to reduce the liquid level in the pulse aerator to the pulse liquid level height H3, all the compressed air collected in the pulse aerator is instantly released under the action of siphon, and the hollow fiber membrane is scrubbed with air; since the hollow fiber membrane is in an open and loose state during pulse aeration, it can float with the compressed air and float up and down with the airflow, thereby increasing the vibration amplitude of the membrane and improving the cleaning effect; 4) With the complete release of the compressed air in the pulse aerator, the air inlet end sealant and the membrane bundle return to a natural drooping state under the action of gravity in the pulse aerator, thereby solving the problem of the membrane filaments being entangled with each other and reducing the effective filtration area of ​​the membrane assembly; 5) As the compressed air continues to enter the pulse aerator, the process of steps 2)-4) is repeated to realize the scrubbing of the membrane assembly.

[0029] In summary, due to its special structural design, the hollow fiber submerged membrane assembly of the present invention achieves that during aeration, the membrane fiber bundle is in an open and loose state, which greatly improves the effect of air scrubbing and utilizes the discharge of pollutants during the aeration process; when not aerated, the hollow fibers are in a naturally drooping state, which is beneficial to improving the water production efficiency and avoiding the loss of filtration membrane area due to the adhesion between the hollow fiber membrane fibers.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hollow fiber submerged membrane module, characterized in that: It includes a membrane bundle, an air inlet end and a water production end respectively arranged at both ends of the membrane bundle; the air inlet end includes an air inlet head, an air inlet casting end arranged in the air inlet head, and a pulse aerator; the pulse aerator includes an aeration chamber and an aeration head arranged in the aeration chamber; the air inlet head is slidably connected to the aeration chamber.

2. The hollow fiber submerged membrane module according to claim 1, characterized in that: The air inlet end and the aeration chamber are provided with sliding grooves correspondingly; and limiting blocks are respectively provided on the sliding grooves.

3. The hollow fiber submerged membrane module according to claim 1, characterized in that: The aeration head comprises a U-shaped aeration outer tube and an aeration inner tube; the air inlet casting end is provided with a channel for accommodating the aeration inner tube.

4. The hollow fiber submerged membrane module according to claim 1, characterized in that: A support frame is arranged between the air inlet end and the water production end.

5. The hollow fiber submerged membrane module according to claim 1, characterized in that: The lower end of the membrane bundle is sealed inside the air inlet casting end.

6. The hollow fiber submerged membrane module according to claim 1, characterized in that: The water production end comprises a water production end shell and a water production casting end arranged in the water production end; the upper end of the membrane bundle exposes the water production casting end and is connected to the water production shell.

7. A method for using the hollow fiber submerged membrane module according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: 1) installing a hollow fiber immersed membrane assembly; 2) introducing compressed air into a pulse aerator, wherein the pulse aerator collects compressed air and freely moves upward along a slide rail under the action of buoyancy, and changes the membrane bundle from a gathered state to an open and loose state; 3) when the air inlet end and the pulse aerator move to a limit block, the compressed air is filled to reduce the liquid level in the pulse aerator to the pulse liquid level height, and under the action of siphon, all the compressed air collected in the pulse aerator is instantly released to perform air scrubbing on the hollow fiber membrane; 4) as the compressed air in the pulse aerator is completely released, the air inlet end sealant and the membrane bundle in the pulse aerator are restored to a natural drooping state under the action of gravity; 5) as the compressed air continuously enters the pulse aerator, the process of steps 2) to 4) is repeated.

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