JPS63278505A - Membrane separation processing equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applicable to the separation treatment of highly concentrated liquids (2, for example, sewage treatment, food concentration treatment, Krug industrial wastewater concentration treatment, etc.) and the treatment of low concentration liquids (2, e.g. Related to membrane separation treatment equipment used for seawater desalination treatment, advanced treatment of secondary sewage treatment, pure water production, etc., as well as various test equipment for determining membrane separation characteristics of raw solutions to be treated and selecting suitable membranes. It is.

[Prior art]

Conventionally, the following devices are known as membrane separation processing devices.

(1) As disclosed in Japanese Patent Application Laid-Open No. 55-145507, one cylinder is divided by a partition wall into a piston chamber and a reverse osmosis chamber containing a semipermeable membrane element, and connected to a piston in the piston chamber. A reverse osmosis membrane separation treatment device in which water to be treated is injected and discharged by reciprocating movement of a rod-shaped piston inside a reverse osmosis chamber.

(2) As disclosed in Japanese Patent Application Laid-Open No. 52-156180, a core having a spiral passage and a cushion body on the outer surface is inserted into a reverse osmosis separation tube, A device configured to remove deposits by changing the direction of flow of a liquid to be processed flowing through a reverse osmosis separation tube into a forward and reverse direction and moving the core back and forth.

(ro) % Publication No. 1982-82808 and Japanese Patent Publication No. 1983
As announced by Publication No. 1-149206.
A membrane surface cleaning body is fitted inside an internal pressure type permeable tubular membrane, a liquid to be treated is caused to flow back and forth within the tubular membrane without forming a closed circulation circuit, and the membrane surface cleaning body is moved back and forth by this flow. A device configured to perform permeation treatment while mechanically cleaning the membrane surface.

[Problem that the invention seeks to solve]

However, the device (1) above has the following problems.

(1) Since the liquid to be treated cannot be caused to flow back and forth along the membrane surface, glue layer deposition is likely to occur.

(2) If the liquid to be treated contains solid matter with a large particle size, pretreatment is required because it will cause clogging.

It is impossible to directly permeate highly concentrated raw water.

(3) Since a Gouster piston is required for each membrane separation unit, the cost becomes high in a large-capacity gland.

(4) Mechanical cleaning of the membrane surface cannot be combined, so the membrane surface is likely to become clogged.

Furthermore, in the case of the device (2) above, there are the following problems.

(1) Since a closed circulation circuit for the water to be treated is required, there is a lot of piping loss, and it is not possible to make the device more compact and cost-effective.

(2) Since pressurization and depressurization cannot be applied alternately to the membrane surface, the membrane surface is likely to become clogged.

Furthermore, among the devices mentioned in (5) above, Japanese Patent Application Laid-Open No. 61-8280
The device shown in Publication No. 8 has the following problems.

(1) Since two reciprocating pumps are required for one membrane separation unit (membrane module),
It is not possible to reduce costs and reduce costs.

(2) Because the inlet of the liquid to be treated and the outlet of the concentrated liquid in the membrane separation unit are located at the same end of the tubular membrane, the concentrated liquid in the membrane separation unit is not completely replaced, and the concentration inside the unit gradually increases. Slazo may accumulate.

Furthermore, among the devices mentioned in (3) above, JP-A-61-1
In the case of the device disclosed in Japanese Patent No. 49206, it is necessary to provide large pressure vessels at both ends of the tubular membrane, so there is a problem that the device cannot be made compact or low-cost.

[Purpose and structure of the invention]

The object of the present invention is to solve the problems of each of the conventional devices, and particularly to provide a membrane separation treatment device that is an improvement over the device disclosed in Japanese Patent Application Laid-Open No. 61-82808. , the gist of this invention is that the internal pressure type/g
A check valve body 5 with a membrane surface cleaning body 2 that is suppressed and moved by the flow of the raw solution to be treated is fitted in the membrane 1, and the internal pressure type tubular membrane 1 is housed in the casing 4, and the cleaning body and reverse A membrane separation unit 5 with a stop valve body is configured, and the cleaning body and the concentrate outlet 6 of the membrane separation unit 5 with a check valve body are connected to the suction port of a reciprocating pump 7 that is not equipped with a suction valve. , there is provided a membrane separation processing apparatus characterized in that a back-up valve seat 9 is provided at an inlet 8 of the raw solution to be processed in the membrane separation unit 5 with a cleaning body and a check valve body.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

1 and 2 show an embodiment of the present invention, in which an upper partition plate is provided at the upper and lower ends of a vertical outer shell 11 having a permeate outlet 10 on the upper side of the peripheral wall. 12 and the lower partition plate 13 are in contact with each other, and each upper partition plate 1
2. A plurality of vertical internal pressure type tubular membranes 1 having liquid permeability are disposed between the lower partition plate 16, and the liquid permeable membrane surface cleaning is carried out by pressure movement within the internal pressure type tubular membranes 1 by the flow of the raw solution to be treated. A check valve body 2 with a check valve body 2 is slidably fitted, and a cylindrical membrane surface cleaning body 2 is fitted in the middle small diameter portion of the check valve body 2. The outer diameter is larger than the diameter of the large diameter portion of the check valve element filter.

The seal ring 14 and the end of the internal pressure type tubular membrane 1 are sequentially fitted into the recesses provided in the upper partition plate 12 and the lower partition plate 15. A small-diameter hole 15 is provided in communication with the internal pressure type tubular membrane 1, and a protrusion 16 and a hole 1
7 is abutted against the upper partition plate 12, the hole 17 is opposite the hole 15 of the upper partition plate 12, and the protrusion 16 is connected to the internal pressure type tubular membrane 1.
It protrudes from the upper end of the inside.

A lower valve seat grate 19 having a check valve seat 9 at the upper end of the inlet 8 for the stock solution to be treated is brought into contact with the lower surface of the lower partition plate 1'5. An upper cover 21 protrudes from the lower end of the internal pressure type tubular membrane 1 through the inner pressure tubular membrane 1 and is provided with a concentrate outlet 6 on the upper surface of the upper stone grate 1B, and is in contact with the outer shell 11. A casing 4 is constructed by connecting the peripheral flanges at both ends, each partition plate 12, 1, each goulet 18, 19, and the upper cover 21 with a large number of bolts, and the casing 4 and the upper cover 21 are further housed in the casing 4. Internal pressure type tubular membrane 1 and membrane surface cleaning body 2 fitted in the internal pressure type tubular membrane 1 1
A membrane separation unit 5 is constituted by the check valve body filter.

The concentrate outlet 6 of the membrane separation unit 5 is connected to the suction port 25 provided at the bottom of the left and right sides of the pump housing 22, respectively.
is connected to the valve seat 24 and the check valve body 2 disposed above the valve seat 24 and the upper part of the left and right sides of the pump housing 22.
A check valve consisting of 5 is provided, and a discharge port 26 is further provided at the center of the upper part of the pump housing 22.

A rubber diaphragm 28 and a central portion of an outer piston 29 are fixed to both ends of a moving shaft 27 extending in the left-right direction, and a peripheral portion of the diaphragm 28 is fixed to the pump housing 22. An air chamber 50 and a pump chamber 51 are defined on both the left and right sides of the air supply system, and between the left and right air chambers 50, an air switching valve 54 with an air discharge port 52 and an air supply port 5'5 is provided. An exhaust unit filter 5 is disposed, and its supply/exhaust unit 55 is connected to each air chamber 30, and compressed air is alternately supplied from the supply/exhaust unit 35 into each air chamber 30, and there are also channels to which compressed air is not supplied. The air is exhausted from the air chamber 50, and each diaphragm 28 and each outer piston 29 are moved alternately in the left and right direction, so that a pumping action is performed alternately on both the left and right sides, and the air supply/exhaust unit filter 5 and the parts housed in the pump housing 22 constitute a reciprocating pump 7, and this reciprocating pump 7 is not equipped with a suction valve.

A flow rate regulating valve 3 is provided at the discharge port 26 of the pump housing 22.
A check valve seat 9 is provided at the upper end of the inlet 8 of the raw liquid to be treated in the membrane separation unit 5, and a flow rate adjusting valve 8 is provided at the permeate outlet 10. A take-out pipe 59 is connected to the raw liquid to be treated 40 in the raw liquid tank 41 containing the raw liquid to be treated. and the inflow end of the stock solution inflow pipe 42 are disposed, and a permeate tank 4 accommodating the permeate 45 .
A discharge end of a permeate extraction tube 59 is housed within the permeate tube 4 .

The air supply port of the conbrella +j45 and the air supply port filter 5 of the air switching valve 34 are connected via an air supply pipe 46, and the air supply pipe 46 is connected to the air supply port 5 of the air switching valve 34. A control device 49 is provided, and the suction end of the suction pipe 51 of the permeate transport pump 50 is disposed in the lower part of the permeate tank 44 .

Next, the operation of the membrane separation treatment apparatus of the above embodiment will be explained.

The compressor 45 is operated to supply compressed air to the air supply pipe 46.
When the left and right pump portions of the reciprocating pump 7 are operated by alternately supplying air to the left and right air chambers 50 via the air supply and exhaust unit 65, the stock solution 40 in the stock solution tank 41 is transferred to the stock solution inlet. 8 and through the check valve seat 9 and flows upwardly within the internal pressure type tubular membrane 1, the pressure inside the internal pressure type tubular membrane 1 and the inside of the pump chamber filtration 1 is reduced, and the raw liquid to be treated is inside the internal pressure type tubular membrane 1. Fill up.

In this process, the check valve body 5 with the membrane surface cleaning body 2 is pushed by the flow of the raw solution to be treated 40 and rises toward the outlet side of the internal pressure type tubular membrane 1 while cleaning the membrane surface of the internal pressure type tubular membrane 1. move,
Then, it hits the protrusion 16 of the upper stone grate 18 and stops. After the check valve body 6 with the membrane surface cleaning body 2 has stopped, the raw liquid to be treated 40 flows into the annular gap between the internal pressure type tubular membrane 1 and the check valve body 5 until the suction process of the pump is completed. and through numerous pores or gaps in the membrane surface cleaning body 2, and through the holes 17 of the upper stone plate 18.
It passes through and is sucked into the pump chamber filter 1.

When the reciprocating type bongua moves to the discharge process, the inside of the pump chamber 31 is pressurized, so the backflow of the raw solution to be treated causes the check valve body filter with the membrane surface cleaning body 2 to move toward the inlet side of the internal pressure type tubular membrane 1. The membrane surface of the internal pressure type tubular membrane 1 is cleaned again by the pressing movement of the check valve body 6 with the membrane surface cleaning body 2. Next, the reverse upward valve body 5 with the membrane surface cleaning body 2 hits the lower check valve seat 9 and stops, and also closes the inlet 8 of the raw solution to be treated, so that the inside of the internal pressure type tubular membrane 1 is pressurized. The raw solution to be treated permeates from the inside of the internal pressure type tubular membrane 1 to the outside.

The raw liquid to be treated that does not permeate from the inside to the outside of the internal pressure type tubular membrane 1 becomes a concentrated liquid and passes through the valve seat 24 in the reciprocating type pongua.
The liquid then flows into the stock solution tank 41 through a discharge valve consisting of a check valve body 25, a discharge port 26, and a discharge pipe filter 7. Further, the permeated liquid that has permeated the outside of the internal pressure type tubular membrane 1 flows into the permeated liquid tank 44 through the permeated liquid extraction pipe filter 9.

The discharge amount of the reciprocating bongua is adjusted by adjusting the compressed air flow rate regulating valve 47.

In addition, by adjusting the flow rate adjustment valve 47, the stroke of the outer piston 29 is adjusted, and the flow rate of the raw solution to be treated in the internal pressure type tubular membrane 1 and the movement speed of the check valve body 3 with the membrane surface cleaning body 2 are adjusted. Set to an appropriate value. Further, by adjusting the pressure regulating valve 48, the pressure during permeation within the internal pressure type tubular membrane 1 is set to an appropriate value.

The reduced pressure in the suction process within the internal pressure type tubular membrane 1 is set by appropriately setting the diameters of the check valve seat 9 and the inlet 8 for the raw liquid to be treated. Further, the ratio between the amount of liquid permeating through the internal pressure type tubular membrane 1 and the amount flowing out of the pump as a concentrated liquid is set to an appropriate ratio by adjusting the flow rate regulating valve 36 of the discharge pipe 57. In addition, in the suction process of the reciprocating Ngua, the pressure inside the internal pressure type tubular membrane 1 is reduced, and at the same time in one discharge process, the amount of backflow liquid is The flow rate is set to an appropriate value by adjusting the flow rate regulating valve 8 of the liquid extraction pipe 39.

When carrying out this invention, the internal pressure type tubular membrane 1 having liquid permeability is made of a material with high wear resistance.

Preferably, for example, a ceramic membrane is used, and preferably a tubular membrane having a uniform cross-sectional shape over its entire length. Further, any of an ultrafiltration membrane, a reverse osmosis membrane, and a microfiltration membrane may be used.

As the material constituting the membrane surface cleaning body 2, open-cell sponge, rubber, metal, ceramic, etc. may be used as a single material or a composite material. The pores that allow circulation can be of any shape as long as there are gaps; for example, metal seats can be made of brush-shaped bodies made of other materials,
A porous cylindrical body having an external shape that fits the cross-sectional shape of the internal pressure type tubular membrane 1 is adopted. Metal as the membrane surface cleaning body 2.

When using a hard material such as ceramic, it is preferable that it be manufactured with high dimensional accuracy and that the weight of the membrane surface cleaning body 2 has a specific gravity close to the specific gravity of the undiluted solution to be treated.

In the case of the above embodiment, the lower part of the membrane separation unit 5 provided with the check valve 9 is immersed in the raw solution to be treated 40 in the raw solution tank 41, so that the membrane separation treatment apparatus is miniaturized.

It can be made into a compact and manufactured at low cost, and the membrane separation treatment equipment can be easily transported, installed, and relocated. In addition, the pressure and flow rate of the stock solution to be treated, the stroke of the reciprocating pump 7, etc. can be easily adjusted, and the internal pressure type tubular membrane 1 can be easily replaced depending on the properties and concentration of the stock solution to be treated. Therefore, the applicable range of the membrane separation treatment device can be widened.

〔Effect of the invention〕

According to this invention, the check valve body 5 with the membrane surface cleaning body 2 which is suppressed and moved within the internal pressure type tubular membrane 1 by the flow of the raw solution to be treated
is fitted, and the internal pressure type tubular membrane 1 is housed in the casing 4 to constitute a membrane separation unit 5 with a cleaning body and check valve body, and the concentration in the membrane separation unit 5 with a cleaning body and check valve body is A reciprocating type with a liquid outlet 6 and no suction valve, I? A check valve seat 9 is connected to the suction port of the pump 7, and a check valve seat 9 is provided at the inlet 8 of the raw liquid to be treated in the membrane separation unit 5 with the cleaning body and check valve body. The permeation separation process can be carried out while regularly performing mechanical cleaning by reciprocating the membrane surface cleaning body 2, backwashing by adjusting the pressure inside the internal pressure type tubular membrane 1, and changing the flow direction. Therefore, it is possible to increase the amount of permeated liquid per membrane area and improve the membrane separation processing efficiency without causing glue layer accumulation on the membrane surface. Since the permeation can be carried out in a single step, it is possible to reduce energy consumption and lower operating costs.Furthermore, the structure is simple, there are few troubles, and maintenance is easy. Moreover, especially in the case of this invention, since the check valve body 5 with the membrane surface cleaning body 2 is fitted into the internal pressure type tubular membrane 1, the membrane separation processing apparatus can be downsized, and moreover, it is possible to Mechanical cleaning and backwashing using the membrane surface cleaning body 2 can be carried out regularly by using the attached equipment, so even highly concentrated stock solutions can be permeated and separated without pretreatment. , and there is no need to provide large pressure vessels before and after the membrane separation unit 5.
Membrane separation processing equipment can be manufactured in a small size and at low cost, and the piping length in the membrane separation processing equipment can be extremely short, so the total flow resistance of the pipes can be reduced and operating costs can be reduced. Effects can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view showing a membrane separation processing apparatus according to an embodiment of the present invention, and FIG. 2 is an enlarged longitudinal sectional side view showing a part of FIG. 1. In the figure, 1 is an internal pressure type tubular membrane, 2 is a membrane surface cleaning body, the filter is a check valve body, 4 is a casing, 5 is a membrane separation unit, 6 is a concentrate outlet, 7 is a reciprocating pumper, and 8 is a covered 9 is a check valve seat, 10 is a permeate outlet, 11 is an outer shell, 1
2 is the upper partition plate, 1 is the lower partition plate, 16 is the protrusion, 18
19 is the lower valve seat grate, 21 is the upper cover, 25 is the suction port, 24 is the valve seat, 2
5 is a check valve body, 26 is a discharge port, 27 is a moving shaft, 28 is a diaphragm, 29 is an outer piston, 50 is an air chamber, filter 1 is a pump chamber, 32 is an air discharge port, 54 is an air switching valve , 55 is a supply/exhaust unit, filter 6 is a flow rate adjustment valve, filter 71
d discharge pipe, 38 is a flow rate adjustment valve, 69 is a permeate extraction pipe, 4
0 is the stock solution to be treated, 41 is the stock solution tank, 42 is the stock solution inflow pipe, 4
5 is a permeated liquid, 44 is a permeated liquid tank, 45 is a fungusa, 4
6 is an air supply pipe, 47 is a flow rate adjustment valve, 48 is a pressure adjustment valve, and 50 is a bonder for transporting permeate.

Claims (1)

[Claims] A check valve body 3 with a membrane surface cleaning body 2 that is pressed and moved by the flow of the raw solution to be treated is fitted into the internal pressure type tubular membrane 1, and the internal pressure type tubular membrane 1 is housed in a casing 4 to clean the cleaning body. A membrane separation unit 5 with a check valve body is configured, and the cleaning body, a concentrate outlet 6 in the membrane separation unit 5 with a check valve body, and a suction port of a reciprocating pump 7 without a suction valve are configured. A membrane separation treatment apparatus characterized in that a check valve seat 9 is provided at an inlet 8 of the raw liquid to be treated in the membrane separation unit 5 with the cleaning body and check valve body connected to each other.