KR101217950B1 - Immersed membrane separation tank and water purification system comprising the same - Google Patents

Abstract

PURPOSE: An immersion membrane separation bath and a water purifying apparatus including the same are provided to keep the concentration of turbid materials low by including a system for automatically discharging the turbid materials from the membrane separation bath. CONSTITUTION: An immersion membrane separation bath includes an immersion bath housing(11), a membrane filtering module(9), an inclined side(7), an aeration pipe(4), a water spraying unit(5), a sludge level meter(3), and a controlling unit(20). The immersion bath housing stores the membrane filtering module. The membrane filtering module is spaced apart from the bottom of the immersion bath housing. The inclined side is installed at the lower part of the membrane filtering module to discharge sludge. The aeration pipe is installed at the lower part of the membrane filtering module. The water spraying unit is installed at the lower part of the membrane filtering module. A transparent pipe is installed at the external wall of the immersion bath housing. The sludge level meter is installed at the lower part of the transparent pipe. The controlling unit controls turbid materials on the bottom of the immersion membrane separation bath to be discharged. [Reference numerals] (AA) Membrane filtering-based treatment water; (BB) Introducing air; (CC) Introducing feed water; (DD) Introducing washing water; (EE) Discharging sludge

Description

Membrane Separation Tank and Water Purification System comprising the same

The present invention relates to a membrane separation immersion tank used in an immersion type membrane filtration water treatment system and a water purification apparatus including the same, and more particularly, after the suspended substances introduced into the membrane separation immersion tank are precipitated under the immersion tank during filtration. The present invention relates to a membrane separation immersion tank capable of maximizing water treatment efficiency by membrane filtration by automatically discharging and a water treatment apparatus including the same.

Existing water treatment technology using membrane filtration can be classified into pressurized and immersed type according to the operation method. In immersion membrane filtration water treatment technology, the membrane is always immersed in water, and in immersion membrane filtration water purification technology, a tank (tank, tank) in which the membrane is immersed is generally called an immersion tank.

In immersion type membrane filtration water treatment technology, the immersion tank is aerated at any time or intermittently during filtration to remove the pollutants adsorbed on the membrane, so that the mixed and condensed turbid substances at the front end are uniformly distributed throughout the immersion tank. They continue to act as membrane pollutants have a problem that the water purification efficiency is lowered.

The present invention is to overcome the problems of the prior art as described above, one object of the present invention is to improve the immersion tank to allow the precipitation of the turbid material to form a gradient of the concentration of the suspended solids in the upper and lower portions of the immersion tank membrane filtration By maintaining a low concentration of the suspended solids at the top where it occurs, it provides a immersion tank capable of high flux membrane filtration.

Another object of the present invention is to provide an immersion tank and a water treatment apparatus including the same to improve the water treatment efficiency by having a system for detecting and automatically discharging when the suspended material deposited in the lower part of the immersion tank is settled more than a certain height. will be.

According to one aspect of the present invention for achieving the above object,
Immersion tank housing for receiving the membrane filtration module;
A membrane filtration module spaced apart from the bottom of the immersion tank housing;
An inclined surface installed at the lower end of the membrane filtration module in the immersion tank housing and formed to extract sludge at both sides of the sludge discharge port;
An aeration pipe installed under the membrane filtration module;
A watering device installed in the lower part of the membrane filtration module;
A transparent pipe connected to the immersion tank housing so as to measure the water level in the immersion tank housing and installed on an outer wall of the immersion tank housing; And
A sludge level measurer installed at a lower end of the transparent pipe and measuring a level of sludge in the immersion tank housing by color change in the transparent pipe;
A control unit for controlling the discharge of the suspended matter deposited in the lower part of the membrane separation vessel by operating the aeration pipe and the sprinkler when it is determined that the sludge level reaches the threshold value by receiving the measured values of the sludge level gauge. It relates to a membrane separation immersion tank comprising.

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Another aspect of the present invention for achieving the above object relates to a water treatment apparatus including the membrane separation immersion tank of the present invention.

The membrane separation immersion tank of the present invention has a structure in which the lower portion of the inclined plate immersion tank, the sludge is automatically discharged when the sludge reaches a certain level by a transparent pipe and a sludge level meter installed outside the immersion tank to collect the suspended substances at the bottom of the immersion tank. It can be discharged quickly.

Since the aeration tank of the present invention does not require aeration during filtration due to the superiority of the membrane and the membrane module, turbid substances of raw water that have been mixed / condensed are introduced into the immersion tank so as to be deposited on the bottom during filtration to prevent contaminants. In addition, in the present invention, since the sedimentation of the turbid material is possible without aeration during filtration, the diffuser tank and the membrane module are installed at a predetermined interval apart from the lower part of the immersion tank in consideration of the sedimentation space of the turbid material in the lower part of the immersion tank. Since the concentration of suspended solids is low and the concentration of membrane pollutants (sustained substances) is low in the upper space where membrane filtration occurs, high flux operation is possible because membrane contamination is less than that of the prior art.

Moreover, the suspended matter deposited in the lower part of the immersion tank may be discharged by the discharge process after backwashing, but the amount of suspended matter deposited in the lower part is accumulated on the bottom slope so that the operation of the membrane filtration process can continue. If the aeration and sprinkling device is installed at the lower part, and the sedimentation of the turbid material is accumulated above a certain height, the sensor automatically detects this and operates the sprinkler to automatically discharge the turbid material from the bottom slope to the outside of the immersion tank.

Figure 1 is a front cross-sectional schematic diagram of the membrane separation immersion tank of an embodiment of the present invention.

Hereinafter, the technical spirit of the present invention will be described in more detail with reference to the accompanying drawings. However, since the accompanying drawings are only exemplary embodiments illustrated in order to explain the technical idea of the present invention in more detail, the technical idea of the present invention is not limited to the accompanying drawings.

Membrane separation immersion tank of the present invention is used in the immersion type membrane filtration water treatment process, the membrane filtration module is installed on the top of the immersion tank spaced apart from the bottom of the immersion tank housing more than a predetermined interval, the aeration for aeration in the lower portion of the membrane filtration module Piping and watering devices are installed, the inclined surface is provided at the bottom of the membrane separation membrane, and the transparent pipe and the sludge level gauge are installed on the outer wall of the housing of the membrane separation vessel.

Figure 1 is a front cross-sectional schematic diagram of the membrane separation immersion tank of an embodiment of the present invention. 1, the membrane separation immersion tank of the present invention comprises a immersion tank housing 11 for receiving the membrane filtration module; A membrane filtration module 9 installed spaced apart from the bottom of the immersion tank housing 11; An inclined surface (7) installed in the immersion tank housing at a lower end of the membrane filtration module (9) and formed to take sludge out of both sludge outlets; An aeration pipe (4) installed below the membrane filtration module (9); A watering device (5) installed in the lower part of the membrane filtration module; A transparent pipe (2) connected to the immersion tank housing (11) and installed on an outer wall of the immersion tank housing (11) to measure the water level in the immersion tank housing (11); And a sludge level measuring device (3) installed at a lower end of the transparent pipe (2) and measuring the level of sludge in the immersion tank housing (11) by color change in the transparent pipe. When it is confirmed that the sludge level reaches the threshold value by inputting the measured values of the sludge level gauge 3, the aeration pipe 4 and the sprinkler 5 are operated to be deposited under the membrane separation warp. It includes a control unit 20 for controlling to discharge the suspended matter.

The membrane filtration module 9 is installed on the upper part of the immersion tank. Preferably, the membrane and the membrane filtration module air cleaning line 8 are provided so that the air is blown out of the aeration membrane below the immersion type membrane of the membrane filtration module 9. 8-1) serves to continuously remove the sludge layer adhering to the separator surface. The membrane filtration treated water flowing into the membrane filtration suction pipe (1) has a suction filtration type immersion membrane having an average pore size of 0.01 to 0.2 μm, preferably a hollow fiber support, and has a tensile strength of 20 to 30 kgf / fil. Solid-liquid separation is carried out by using a phosphorus separator.

Between the membrane filtration module 9 and the inclined surface 7, an aeration pipe 4 and a sprinkling apparatus 5 for removing the contaminants attached to the inclined surface are installed. The inclined surface 7 does not necessarily need to be formed symmetrically, but may be formed symmetrically.

The watering device 5 is installed in the lower portion of the immersion tank and the lower watering device for supplying high-pressure washing water from the outside; And one or more spray nozzles installed on the lower sprinkler at regular intervals and configured to spray the washing water toward the inclined surface 7. The watering device is connected to the external watering pump 5-1, and the water in the coagulation tank of the front end flows into the pump.

On the other hand, the aeration pipe (4) is installed in the lower portion of the membrane filtration module and the lower watering pipe, the lower aeration pipe for dropping the solid foreign matter deposited by injecting air to the inclined surface (7); And one or more air spray nozzles formed at regular intervals on the lower aeration pipe to inject air toward the bottom of the membrane immersion tank. The aeration pipe 4 is connected to an external aeration blower 8-1, and the aeration pipe for cleaning the membrane filtration module 9 may also be connected to the aeration blower 8-1.

In another embodiment of the present invention, the watering device and the aeration pipe is formed of one pipe, both of the air spray nozzle and the water spray nozzle for spraying the washing water is formed, the air is injected by the control by the valve Or selectively to spray washing water.

The transparent pipe 2 is installed on the outer wall surface of the immersion tank housing 11 of the present invention, through which the water level in the immersion tank can be measured with the naked eye. The sludge level measuring device 3 is installed at the lower end of the transparent pipe 2 and is a means for measuring the height of the turbid material by using a color sensor. The height of the turbid material is accumulated and the sprinkler is operated. If the height of the suspended material is lowered, the stopping height is measured.

The control unit 20 converts an analog signal of the sludge level value measured by the sludge level measuring unit 3 into a digital signal and an aeration pipe 4 according to the digital signal converted by the AD converter. And a program logic controller (PLC) in which a program for automatically controlling the sprinkler 5 is embedded. The control unit 20 controls the operation of the aeration blower 8-1, the sprinkling pump 5-1, and the discharge pump 6-1 according to the sludge level detected by the sludge level gauge 3.

The controller 20 performs various operations, executes data transmission and control, and determines whether or not the condition is reached, that is, whether the sludge level reaches a set threshold. To this end, the control unit 20 uses a control unit having an integrated control function such as a central processing unit (CPU), a microprocessor, a main control unit (MCU), a microcomputer, etc., which is well known to those skilled in the art, and thus a detailed description thereof will be omitted.

During the filtration period of the treated water containing the suspended substances entering the membrane separation immersion tank, the suspended substances are deposited in the lower part of the membrane separation immersion tank, and the sludge level gauge (3) when the deposited suspended substances reaches a certain height (critical value). The membrane filtration process is automatically stopped and the aeration blower (8-1), the watering pump (5-1), and the discharge pump (6-1) installed on the outside of the membrane separation submerged tank are operated. The suspended matter is discharged from the membrane separation immersion tank through the discharge water pipe (6). On the other hand, when the level of the suspended solids deposited in the membrane separation submerged tank lowers to a predetermined level by discharge, it is detected by the sludge level gauge (3) to detect the aeration blower (8-1) and the water pump (5- 1) Stop the operation of the discharge pump 6-1 and resume the membrane filtration process. This process is programmed to be operated automatically through the sludge level meter 3 and the PLC in the control unit 20.

When the membrane filtration immersion tank of the present invention is constructed, a turbidity concentration gradient occurs at the top and bottom of the immersion tank, and high flux filtration is possible at low turbidity at the top. In addition, when the sludge reaches a certain level through the sludge level meter (3) installed on the outer wall surface, the suspended solids deposited in the lower part of the membrane separation immersion tank by aeration and sprinkling of the lower part of the membrane separation immersion tank are automatically discharged to the outside. It is possible to prevent the suspended material from being deposited above a certain height.

Another aspect of the present invention relates to a water treatment apparatus including the membrane separation immersion tank of the present invention. Such water purifying apparatus may be connected to various treatment tanks as needed before and after the immersion tank. For example, a mixing tank, an agglomeration tank, and the like may be individually connected to the front of the immersion tank, and an ozone treatment tank, an activated carbon filtration tank, and the like may be connected to the high end water treatment.

 Hereinafter, the present invention will be described in detail with reference to the following examples, but the present invention is not limited thereto.

Example

As an example, turbidity 600 containing turbid material, organic matter, and soluble metals collected from Paldang using a immersion tank of the present invention having a size of 5 tons and a conventional immersion tank of a full aeration method as a comparative example. After treating NTU treated water, turbidity was measured by using a turbidimeter (DR23700, manufactured by HACH), and the change in interlayer differential pressure (differential pressure increase rate) according to operating time was measured and measured by a pressure transmitter. The performance of the membrane immersion tanks of Examples and Comparative Examples is shown in Table 1 below.

division Measurement result Effluent Turbidity
(NTU) Example 1,000 Comparative example 250 Immersion tank supernatant turbidity
(NTU) Example 25 Comparative example 75 Differential pressure
(kPa / day) Example 0.2 Comparative example 0.4

As confirmed through the results of Table 1, the result of operating the membrane filtration immersion tank of the present invention, the sludge discharge was automatically carried out every 4 to 5 days by the sludge level gauge. Effluent turbidity was measured to be greater than 1,000 NTU, which is about four times higher than the turbidity emitted in the comparative example operated without the facility. The top turbidity of the membrane separation immersion tank of the Example was measured to be about 3 times lower than the top turbidity of about 75 NTU of the comparative example, which aerated at 20 to 30 NTU. As a result of the operation of the membrane filtration process, the change in the differential pressure (differential pressure increase rate) was also less in the case of the membrane immersion tank of the present invention than the comparative example. Therefore, it can be seen that the membrane separation immersion tank top of the present invention is always maintained in a lower turbidity than the comparative example, it is possible to filter the high flux.

As mentioned above, although this invention was demonstrated in detail with reference to the preferred embodiment of this invention, those skilled in the art will easily assume various changes and correction within an obvious range based on the teaching of this invention. Accordingly, such changes and modifications should be construed as being included within the scope of the invention as defined by the appended claims.

1. Membrane filtration suction tubing 2. Transparent tubing
3. Sludge level gauge 4. Aeration piping
5. Sprinkler System 5-1. Sprinkler Pump
6. Drainage Pipe 6-1. Discharge pump
7. Inclined surface 8. Membrane module air cleaning line
8-1. Aeration blower 9. Membrane filtration module
10. Raw water inlet line 11. Immersion tank housing
12. Solid-liquid separation zone 13. Sludge concentration zone
20: control unit

Claims (8)

Immersion tank housing for receiving the membrane filtration module;
A membrane filtration module spaced apart from the bottom of the immersion tank housing;
An inclined surface installed at the lower end of the membrane filtration module in the immersion tank housing and formed to extract sludge at both sides of the sludge discharge port;
An aeration pipe installed under the membrane filtration module;
A watering device installed in the lower part of the membrane filtration module;
A transparent pipe connected to the immersion tank housing so as to measure the water level in the immersion tank housing and installed on an outer wall of the immersion tank housing; And
A sludge level measurer installed at a lower end of the transparent pipe and measuring a level of sludge in the immersion tank housing by color change in the transparent pipe;
A control unit for controlling the discharge of the suspended matter deposited in the lower part of the membrane separation vessel by operating the aeration pipe and the sprinkler when it is determined that the sludge level reaches the threshold value by receiving the measured values of the sludge level gauge. Membrane separation immersion tank comprising a.
According to claim 1, wherein the membrane separation immersion tank is detected by a sludge level meter when the level of the suspended solids deposited on the lower part of the membrane separation immersion tank by the discharge of the sludge to a predetermined level of the aeration pipe and the watering device Membrane immersion bath, configured to stop operation and resume the membrane filtration process.
The apparatus of claim 1, wherein the controller comprises: an AD converter for converting an analog signal of a sludge level value measured by the sludge level gauge into a digital signal;
Membrane immersion tank comprising a program logic controller (PLC) with a program for automatically controlling the aeration pipe and the watering device according to the digital signal converted by the AD converter.
According to claim 1, wherein the watering device is installed in the lower portion of the immersion tank and the lower watering device for supplying the high pressure washing water from the outside; And
Membrane separation immersion tank is installed on the lower sprinkler at regular intervals, comprising one or more spray nozzles configured to spray the washing water toward the inclined surface.
According to claim 1, The aeration pipe is installed in the lower portion of the membrane filtration module and the lower sprinkling pipe, the lower aeration pipe for dropping the solid foreign matter deposited by injecting air to the inclined surface; And
Membrane immersion tank comprising one or more air spray nozzles formed at regular intervals on the lower aeration pipe to inject air toward the bottom of the membrane separation immersion tank.
The membrane separation immersion tank according to claim 1, wherein the aeration pipe and the watering device are formed in one pipe, and an air spray nozzle and a watering nozzle are provided together on the pipe.
The membrane immersion tank according to claim 1, wherein the membrane filtration module comprises an immersion type membrane having a pore having an average pore size of 0.01 to 0.2 μm and a hollow fiber support to have a tensile strength of 20 to 30 kgf / fil. .
A water treatment apparatus comprising the membrane separation immersion tank according to any one of claims 1 to 7.

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