JPH05103955A - Membrane treatment - Google Patents

Abstract

PURPOSE:To drastically improve the yield of a product by almost using up an untreated original liquid in a circulation type membrane treatment. CONSTITUTION:If the original liquid in the original liquid tank 1 used up or becomes below a prescribed quantity, the 1st separation by a 1st circulation type membrane treatment device is finished and the 2nd separation by a 2nd circulation type membrane treatment device is prepared for use. As the preparation, in the state that the valves V1, V2, V7 and V10 are opened and one more valve is closed, hot water from a hot water tank 2 is fed to the 1st circulation type membrane device 11 to supply the original liquid held respectively in the 1st order side of membrane modules M1, M2, M3 and M4 to a cushion tank 22. As the next preparation, in the state that the valves V1, V8, V9 and V10 are opened and one more valve is closed, the hot water from the hot water tank 2 is fed only to a return pipe line 14 to feed the residual original liquid in the pipe line 14 to the cushion tank 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film processing method in which a plurality of film processing apparatuses are arranged in series.

[0002]

2. Description of the Related Art In the fermented food industry and bioreactors, a membrane treatment system has been conventionally used to increase the concentration of a stock solution such as a fermented solution or a culture solution and to recover the products existing in the stock solution. As a general membrane treatment system, the undiluted solution in the undiluted solution tank is supplied to a membrane treatment device incorporating a membrane module consisting of hollow fiber membrane, tubular membrane (including lotus root membrane) or rotary flat membrane, and cross flow filtration method. Thus, the stock solution is flowed in parallel with the membrane surface to take out the permeate in a direction orthogonal to the membrane surface, and the concentrated stock solution is returned to the tank again.

In such a conventional membrane processing system,
Since the capacity of the circulation pump and the capacity of the membrane are designed on the basis of the state that the stock solution is sufficiently contained in the tank, if the amount of the remaining stock solution in the stock solution tank becomes small, it becomes impossible to process. Therefore, in JP-A-3-123611, a large-capacity main line including a large ceramic film and a sub-line including a small ceramic film are provided in parallel, and the main line is operated when the amount of the stock solution is sufficient. The sub-line is operated when the amount of the stock solution becomes small.

[0004]

As described above, if a large-capacity main line and a small-capacity sub-line are provided in parallel, the amount of undiluted solution that remains unprocessed in the tank will be reduced, but the membrane processing apparatus will be reduced. A considerable amount of undiluted solution remains inside and in the circulation pipe.

[0005]

In order to solve the above-mentioned problems, the present invention separates the stock solution in the stock solution tank into a permeate and a concentrated solution by the first circulation type membrane treatment apparatus, and the stock solution in the stock solution tank disappears. If the amount becomes less than the fixed amount, the supply of the stock solution from the stock solution tank to the first circulation type membrane treatment apparatus is stopped and the stock solution held in the first circulation type membrane treatment apparatus is cooled down with hot water or the like. The film was extruded into the second circulating membrane treatment device arranged on the side, and was further separated into the permeate and the concentrated liquid by this second circulating membrane treatment device.

[0006]

The undiluted solution remaining in the first circulation type membrane treatment apparatus is further separated in the membrane treatment apparatus on the downstream side, so that the yield of the product is improved.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a diagram showing a membrane treatment system for carrying out the membrane treatment method according to the present invention. This membrane treatment system is provided with a stock solution tank 1 and a hot water tank 2 for storing stock solutions such as soy sauce, juice, and vinegar. The first circulation type membrane treatment device 11 and the second circulation type membrane treatment device 21 are arranged in series on the downstream side of the tanks 1 and 2.

The first circulation type membrane treatment apparatus 11 is a membrane module M1, M2, M3 suitable for treating a large amount of a low concentration stock solution such as a hollow fiber membrane or a tubular membrane (including lotus root membrane).
M4, the bottom of the stock solution tank 1 and the primary side of the first-stage membrane module M1 are connected by a pipe 12, and the primary side of each membrane module M1, M2, M3, M4 is connected by a pipe 13 ... The return pipe 14 is led out from the primary side of the membrane module M4.

A pipe 15 from the hot water tank 2 is connected to the pipe 12, a valve V1 is provided in the pipe 15, and pumps P1 and P2 are provided in the pipe 12 and a valve is provided immediately before the pump P2. V2 is provided, and pipes 16 for taking out the permeated liquid are led out from the secondary side of each of the membrane modules M1, M2, M3, M4, and these pipes 16 ... Are connected to the pipe 17.
And the valves V3, V4, V5 for each pipe 16 ...
V6 is provided, and valves V7, V8, and V9 are provided in the middle of the return pipe 14 that connects the primary side of the membrane module M4 and the pumps P1 and P2 of the pipe 12.

On the other hand, the second circulation type membrane treatment device 21 comprises a cushion tank 22 and a membrane module 23 incorporating a rotary flat membrane suitable for treating a small amount of a high-concentration stock solution. The undiluted solution is supplied to the cushion tank 22 by a pipe 24 connected in the middle of the pipe 14.
The exhaust pipe 25 is provided with valves V10 and V11, and the cushion tank 22 and the membrane module 23 are connected by a supply pipe 26 and a return pipe 27. The supply pipe 26 has a pump P3.
Is provided. The membrane of the membrane module 23 of the second circulation membrane treatment device 21 may be a hollow fiber membrane, a tubular membrane (including lotus root membrane), or the like in the case of a low concentration (low viscosity) stock solution.

Next, a film processing method by the above film processing system will be described. First, the valves V2, V3, V
4, V5, V6, V7, V8 and V9 are opened and the other valves are closed, and a stock solution such as soy sauce is completely stored in the stock solution tank 1. This stock solution is pumped by the pumps P1 and P2. First-stage membrane module M of the first circulating membrane treatment apparatus 11
1 to the primary side.

Then, the permeated liquid separated in the first-stage membrane module M1 is recovered or discarded through the piping 16 and 17, and the concentrated liquid is introduced into the second-stage membrane module M2, and similarly permeated. Liquid and concentrated liquid, and thus, the membrane module M4 in the final stage, in the example, the fourth stage in the example
The concentrated liquid of (1) is again supplied to the first-stage membrane module M1 via the return pipe 14 together with the new stock solution supplied from the stock solution tank 1. At this time, the valve V10 is slightly opened to allow a part of the concentrated liquid of the membrane module M4 to be stored in the cushion tank 22.
It may be stored in.

In this way, when the stock solution in the stock solution tank 1 is exhausted or becomes less than a predetermined amount, the primary separation is completed and preparations are made for the secondary separation. As a preparation, first, the valves V1, V2, V7 and V10 are opened and the other valves are closed, and hot water from the hot water tank 2 is supplied to the first circulation type membrane treatment apparatus 11, and each membrane module M1, M2, M
The stock solution held on the primary side of M3 and M4 is sent to the cushion tank 22. Cushion tank 22 at this time
Since the quality of the product may change when hot water enters, check the hold amount in advance, and this amount is the cushion tank 2
Immediately before it is sent to 2, the valve V11 is opened and the valve V1 is opened.
Perform operations such as closing 0.

As a next preparation, with the valves V1, V8, V9 and V10 opened and the other valves closed, the hot water from the hot water tank 2 is supplied only to the return pipe 14, and the pipe 14
The undiluted solution remaining inside is sent to the cushion tank 22. At this time as well, hot water is prevented from entering the cushion tank 22.

As described above, when the stock solution remaining in the first circulation type membrane treatment apparatus 11 is fed into the cushion tank 22, the concentrated stock solution is circulated by the pump P3 and the membrane is cross-flow filtered. Perform processing.

2 and 3 are views showing a membrane treatment system for carrying out another embodiment. In the embodiment shown in FIG. 2, the membrane module M1 is replaced by hot air from the compressor 3 instead of hot water. , M2, M3, M4 are fed into the cushion tank 22, and in the embodiment shown in FIG. 3, the first circulating membrane treatment device 11 is used.
An intermediate circulating membrane treating device 31 is arranged between the second circulating membrane treating device 21 and the concentration of the stock solution is gradually increased so that a smooth operation can be performed.

In the embodiment, the undiluted solution remaining in the first circulation type membrane treatment apparatus is fed to the circulation type membrane treatment apparatus on the downstream side with hot water or pressurized air, but instead of hot water. Water may be used, or a pump may be provided in a pipe connecting the first circulation type membrane treatment apparatus and the second circulation type membrane treatment apparatus, and the stock solution may be sucked and fed by this pump.

[0018]

As described above, according to the present invention,
Since multiple circulating membrane treatment devices were installed in series and the undiluted solution remaining in the upstream membrane treatment device was sent to the downstream circulating membrane treatment device suitable for separating a concentrated solution of higher concentration. The untreated stock solution is almost eliminated, the yield of the product from the stock solution is improved, and the amount of industrial waste that has been discarded can be reduced. Further, by introducing hot water or water into the membrane module, a cleaning effect can be exhibited.

[Brief description of drawings]

FIG. 1 is a diagram showing a film processing system for carrying out a film processing method according to the present invention.

FIG. 2 is a diagram showing a membrane processing system for carrying out another embodiment.

FIG. 3 is a diagram showing a membrane processing system for carrying out another embodiment.

[Explanation of symbols]

1 ... Undiluted solution tank, 2 ... Hot water tank, 3 ... Compressor, 1
DESCRIPTION OF SYMBOLS 1 ... 1st circulation type membrane processing apparatus, 21 ... 2nd circulation type membrane processing apparatus, 31 ... Intermediate circulation type membrane processing apparatus.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuhiko Kanekuni, inventor Nakajima 2-chome, 1-1, Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture (72) Kenji Tabata, Kenji Tabata Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka 2-1, 1-1 Totoki Equipment Co., Ltd.

Claims (3)

[Claims] 1. The first circulating membrane treatment apparatus separates the stock solution in the stock solution tank into a permeate and a concentrated solution, and when the stock solution in the stock solution tank is exhausted or becomes less than a predetermined amount, the stock solution is removed from the stock solution tank. The supply of the stock solution to the first circulation type membrane treatment apparatus is stopped, and the stock solution held in the first circulation type membrane treatment apparatus is supplied to the second circulation type membrane treatment apparatus arranged on the downstream side. A membrane treatment method characterized in that a permeate and a concentrate are separated. 2. The stock solution held in the first circulation type membrane treatment apparatus is supplied to the second circulation type membrane treatment apparatus arranged on the downstream side by suction of water, hot water, pressurized air or a pump. The film processing method according to claim 1, wherein: 3. After supplying the stock solution held in the first circulation type membrane treatment apparatus to the second membrane treatment apparatus arranged on the downstream side, the stock solution is introduced into the circulation pipe of the first circulation type membrane treatment apparatus. The membrane treatment according to claim 1 or 2, wherein the held stock solution is supplied by water, hot water, pressurized air or the like to a second circulation type membrane treatment device arranged on the downstream side. Method.