JPH08332357A - Method and apparatus for regenerating filter module - Google Patents

Abstract

PURPOSE: To efficiently remove the deposit bonded to the filtering surfaces of hollow yarn membranes by appropriately changing over the supply and discharge of backwashing water to change the water level in a module along hollow yarn bundles. CONSTITUTION: The filtering operation of a filter module 1 is performed by supplying raw water to the partitioned space 5 of a cylindrical case 2 as shown by an arrow A to filter the same by semipermeable hollow yarn bundles 3 and allowing the filtered water to flow out toward the upper surface of a partition wall as shown by an arrow B. A vibrator 8 is horizontally moved, for example, in amplitude of 5cm at 150 cycles/min and a filter to be regenerated is fixed to this vibration part so that a raw water supply port at a time of filtering becomes an upper side and a washing water discharge pipe 9 is connected to the filter and a backwashing water supply pipe 10 is connected to the transmitted water outlet at the time of filtering. An opening and closing valve 12 is provided to the backwashing water supply pipe 10. A backwashing water drain pipe 11 is provided between a filter connection port and the opening and closing valve 12 as a branch pipe and an opening and closing valve 13 is provided to the backwashing water drain pipe 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for regenerating a filter module for removing deposits adhering to the filtration surface of a hollow fiber membrane of a filter module using a water permeable hollow fiber membrane.

[0002]

2. Description of the Related Art When a hollow fiber membrane is used for filtration, there is a problem that fine particles blocked by the hollow fiber membrane adhere to the filtration surface to cause clogging and reduce the permeation flux. Therefore, as a method of removing deposits adhering to the filtration surface, backwashing is performed by periodically pumping water, air or carbon dioxide saturated water from the secondary side of the filtration membrane, or the filtration surface is vibrated by ultrasonic waves or air bubbles. There is a method to remove the deposited deposits by
There is a problem in that the deposits cannot be removed uniformly. For this reason, there is a drawback that the recovery rate of the filtering ability is low even after washing and the use time is short.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and an apparatus for regenerating a filter module for efficiently removing deposits adhering to the filtration surface of a hollow fiber membrane.

[0004]

Means for Solving the Problems The present invention which achieves the above object is to provide a backwash water to the filter module using hollow fiber membranes while mechanically vibrating the filter module so that the water in the module is filtered. When the water is shaken to separate the deposits adhering to the filtration surface and flow out to the outside of the system, the water level in the module is changed along the hollow fiber bundle by appropriately switching the water supply and drainage of the backwash water. It is a method of regenerating the filter module.

When it is difficult to easily remove the deposited deposits, in order to enhance the cleaning effect, an aqueous solution of hydrochloric acid, citric acid, oxalic acid, hypochlorous acid, or synthetic detergent may be used alone or mixed in backwash water. They may be used, or as a pretreatment, the above method may be carried out after immersing them in an aqueous solution of them or a mixture thereof.

Next, in the regenerating apparatus for a filter module of the present invention, a filter module using a hollow fiber membrane is engaged with an oscillating device for giving mechanical vibration, and backwashing water for supplying backwashing water to the module is engaged. A water supply pipe and a wash water discharge pipe for discharging wash water that has passed through the module to the outside of the system,
A backwash water discharge pipe for discharging the backwash water from the backwash water supply pipe to the filter module to the outside of the system is provided, and further backwash water is provided between the backwash water supply pipe and the backwash water discharge pipe. It is characterized by being provided with an on-off valve capable of arbitrarily switching water supply / drainage.

That is, according to the present invention, the backwashing water is flown through the clogged module as described above, and mechanical vibration is externally applied to rock the water in the module to remove the deposits adhering to the filtration surface. Alternatively, it is possible to separate the deposits adhering to the filtration surface by changing the water level in the module up and down along the hollow fiber bundle by appropriately switching the water supply and drainage of the backwash water while applying mechanical horizontal vibration from the outside. It is a feature.

[0008]

The present invention will be described below with reference to specific examples.
The present invention is not limited to the examples as long as the gist of the invention is not exceeded.

FIG. 1 is a perspective view showing an embodiment of a filter module regenerating apparatus using a hollow fiber membrane of the present invention.

FIG. 2 is a vertical sectional view showing an example of a filter module applied to the embodiment of the present invention.

FIG. 3 is a vertical sectional view showing an example of a filter applied to the embodiment of the present invention.

The filter module 1 in FIG. 2 comprises a cylindrical case 2, a hollow fiber bundle 3 made of a semipermeable membrane, and a partition wall 4 molded from a thermosetting resin.

The inside of the cylindrical case 1 is partitioned by a partition wall 4, and a partition space 5 for supplying raw water is formed on one side. The hollow fiber bundle 3 is folded in a U shape and stored in the partition space 5, and both ends of the hollow fiber bundle 3 are provided so that the hollow portion opens to the opposite side wall surface with respect to the partition wall 4. It communicates with the upper surface side of the wall 4.

The above module may be a filter module in which one end of the hollow fiber bundle is closed.

In the filtering operation in the filter module 1 having the above structure, the raw water is in the cylindrical case 2 as shown by the arrow A.
Is supplied to the partition space 5 of the hollow fiber bundle 3 of the semipermeable membrane.
It is filtered so as to flow out to the upper surface side of the partition wall 4 as indicated by arrow B.

FIG. 3 shows a filter in which a plurality of filter modules 1 are connected in parallel by a pair of connectors 6 and 7. Raw water is supplied from the arrow A, and permeated water flows out from the arrow B.

Next, a reproducing method and a reproducing apparatus of the present invention will be described with reference to FIG. 1. In FIG. 1, reference numeral 8 is a vibrating device, and the vibrating device has, for example, an amplitude of 5 cm and a period of 1 minute.
A vibrating device that horizontally moves for 50 cycles, and a filter to be regenerated, for example, a filter shown in FIG.
The raw water supply port at the time of filtration is fixed so that the washing water discharge pipe 9 is connected to this, and the backwash water supply pipe 10 is connected to the permeate outlet at the time of filtration. This backwash water supply pipe 10
An on-off valve 12 is provided in the. On the other hand, a backwash water discharge pipe 11 is provided as a branch pipe between the filter connection port and the open / close valve 12, and the backwash water discharge pipe 11 is provided with an open / close valve 13.

The backwash water is supplied from the backwash water supply pipe 10 to the opening / closing valve 1.
It is sent to the filter through 2 and is passed from the inside to the outside of the hollow fiber to be discharged from the wash water discharge pipe 9. At this time, the open / close valve 12 is open and the open / close valve 13 is closed. When the on-off valve 12 is closed and the supply of backwash water is stopped, the on-off valve 13 is opened, air is introduced from the wash water discharge pipe 9 due to the head difference, and the backwash water in the partition space 5 of the filter module is hollow. The yarn passes from the outside to the inside and is discharged from the backwash water discharge pipe 11. The on-off valves 12 and 13 are interlocked, and this operation is repeated. The time for supplying and draining the backwash water is appropriately set according to the state of the adhered substances, and the washing is continued until the wash drainage does not become turbid.

Specifically, the deposits of the module used for purifying the pool water are a mixture of organic substances such as ester compounds and amide compounds and inorganic substances such as silicates and iron,
Since it adheres firmly, it is difficult to remove it by normal backwashing, but according to the regeneration method of the present invention, the recovery of the filtering ability is more effective.

The present invention will be described below based on specific examples.

The clogged module was immersed in a citric acid solution to sufficiently dissolve iron, the citric acid solution was removed, and then the module was immersed in an aqueous solution of a synthetic detergent and then applied to the filter module of the present invention. . A filter consisting of eight modules was set on a vibrator, and the backwash water pressure was 50 KPa (0.5 k
gf / cm ² ), water supply time of backwash water 90 seconds, water supply stop time (drainage time) 30 seconds, amplitude 5 cm, 1 minute by horizontal vibration of 150 cycles for 1 hour.

The recovery rate of the filtration capacity due to regeneration is the head pressure of 5
The membrane filtered water amount at 0 cm was measured and expressed as a ratio to the filtered water amount of the new membrane. The recovery rate of the filtration performance was compared between the case of washing under the above-mentioned conditions, the case of washing only with backwash water for the same time, and the case of washing with only water supply / drainage of backwash without washing for the same time. Although there are differences between the modules, the following differences in recovery rates were confirmed by the backwash method.

When vibration and water supply / drainage of backwash water are performed Recovery rate 85-95% When only water supply of vibration and backwash water is performed Recovery rate 45-55% When water supply / drainage of backwash water is performed Recovery rate 40- 50% Moreover, in the example of the clogging module which filtered tap water,
After immersing in 50% 4% hydrochloric acid solution for 20 minutes, vibration and backwash water supply and drainage were compared with vibration and backwash water supply only. Was 95-100%.

[0024]

As described above, in the method and apparatus for regenerating the filter module of the present invention, the appropriate backwashing conditions are selected depending on the clogging condition and the nature of the deposited deposits, so that the normal backwashing can remove them. It is possible to remove deposits that are difficult to remove,
It was possible to restore the filtration capacity to the point where it had almost no bearing for reuse. In addition, the filtration cost could be reduced by reusing the filter module.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a filter module regenerating apparatus using a hollow fiber membrane of the present invention.

FIG. 2 is a vertical sectional view showing an example of a filter module applied to an embodiment of the present invention.

FIG. 3 is a vertical sectional view showing an example of a filter applied to an embodiment of the present invention.

[Explanation of symbols]

 1 Filter Module 2 Cylindrical Case 3 Hollow Fiber Bundle 4 Partition Wall 5 Partition Space 6, 7 Connector 8 Vibration Machine 9 Wash Water Discharge Pipe 10 Backwash Water Supply Pipe 11 Backwash Water Discharge Pipe 12, 13 Open / close Valve

Claims (3)

[Claims] Claim: What is claimed is: 1. While mechanically vibrating a filter module using a hollow fiber membrane, backwash water is flown through the filter module to rock the water in the module to remove deposits adhering to the filtration surface. A method of regenerating a filter module, wherein the water level in the module is changed along the hollow fiber bundle by appropriately switching the water supply and drainage of the backwash water when peeling and flowing out of the system. 2. The method for regenerating a filter module according to claim 1, wherein the backwash water contains at least one of hydrochloric acid, citric acid, oxalic acid, hypochlorous acid, and a synthetic detergent. 3. A backwash water supply pipe for supplying backwash water to the module while engaging a filter module using a hollow fiber membrane with a vibrating device for giving a mechanical vibration, and a washing which has passed through the module. A wash water discharge pipe for discharging water to the outside of the system and a backwash water discharge pipe for discharging the backwash water from the backwash water supply pipe to the filter module to the outside of the system are provided, and further, these backwash waters are provided. A regeneration device for a filter module, which is provided with an opening / closing valve capable of arbitrarily switching the supply and drainage of the backwash water between the water supply pipe and the backwash water discharge pipe.