CN114287554A

CN114287554A - Ultrasonic-assisted salted egg white ultrafiltration desalination system and method

Info

Publication number: CN114287554A
Application number: CN202111477443.6A
Authority: CN
Inventors: 祝志慧; 华俊杰; 马美湖; 何昱廷; 周宏杰; 蔡紫荆
Original assignee: Huazhong Agricultural University
Current assignee: Huazhong Agricultural University
Priority date: 2021-12-06
Filing date: 2021-12-06
Publication date: 2022-04-08

Abstract

The ultrasonic-assisted salted egg white ultrafiltration desalination system comprises an ultrasonic stirrer, wherein an inlet pipe and an egg white pipe are communicated with an inlet of the ultrasonic stirrer, an outlet of the ultrasonic stirrer is communicated with the upper end of a buffer tank through a mixed flow pipe, the bottom of the buffer tank is communicated with a feed liquid tank through a liquid discharge pipe, the upper end and the lower end of the feed liquid tank are respectively communicated with an ultrafiltration membrane assembly through a liquid return pipe and a filter pipe, an infusion pump is installed on the filter pipe, and the bottom of the feed liquid tank is communicated with a low-temperature thickener through a liquid forming pipe. The present invention can improve the desalting efficiency.

Description

Ultrasonic-assisted salted egg white ultrafiltration desalination system and method

Technical Field

The invention relates to the field of food processing, in particular to an ultrasonic-assisted salted egg white ultrafiltration desalination system and method.

Background

The salted egg white is a byproduct in salted egg yolk production, and because the salt content is high, before the salted egg white is used as food or lysozyme is extracted, the existing salted egg white desalting device mainly adopts ultrafiltration desalting, but the salted egg white desalting process is rarely combined, a cleaning device is lacked, and the defects are that: the desalting process of the salted egg white is not optimized, so that the desalting efficiency is low, the cost is high, and the loss is large; in addition, due to the existence of concentration polarization phenomenon, the absence of a cleaning device can cause a large amount of protein to be attached to an ultrafiltration membrane and remain in a membrane separation component and cannot be discharged, so that the desalting efficiency is reduced and a large amount of protein is lost; the residual protein can further cause membrane blockage, and seriously influences the performance of the membrane, so that the desalting efficiency is continuously reduced until the membrane is completely blocked; and if large-particle impurities are doped in the egg white liquid, the membrane pollution is increased, and even the membrane damage can be caused.

Disclosure of Invention

The invention aims to provide an ultrasonic-assisted salted egg white ultrafiltration desalination system and method, which can improve the desalination efficiency.

In order to solve the problems, the technical scheme of the invention is as follows:

supplementary salted egg white ultrafiltration desalination system of ultrasonic wave, including ultrasonic mixer, inlet tube and egg white pipe intercommunication ultrasonic mixer inlet, ultrasonic mixer liquid outlet passes through mixed flow pipe and buffer tank upper end intercommunication, and buffer tank bottom is through fluid-discharge tube intercommunication feed liquor jar, and both ends communicate with milipore filter subassembly through liquid return pipe and filter tube respectively about the feed liquor jar, installs the transfer pump on the filter tube, and feed liquor jar bottom is through becoming liquid pipe and cryo-concentrator intercommunication.

The liquid discharging device comprises a buffer tank, a liquid discharging barrel, a plurality of layers of filter screens, a mixed flow pipe, a defoamer, a basket filter, a first valve and a second valve.

Egg liquid pipe and inlet tube pass through venturi intercommunication ultrasonic mixer inlet, install third valve and first flowmeter on egg liquid pipe, install fourth valve and second flowmeter on the inlet tube.

And a salinity sensor and a liquid level meter are arranged on the feed liquid tank.

The invention has the beneficial effects that: the protein particles in the salted egg white are polymerized and reduced by adopting an ultrasonic mixer, salt molecules in the protein particles are quickly separated out and mixed with water to form mixed liquor, the mixed liquor is cut by a plurality of layers of filter screens, the protein particles are further refined, the polymerization state of the protein particles is further reduced, the fluidity of the emulsion is enhanced, the filtering of an ultrafiltration membrane component can be facilitated, and the desalting efficiency in the salted egg white is greatly improved; in addition, the backwashing is added, so that the service life of the ultrafiltration membrane is prolonged.

Drawings

The invention is further described below with reference to the accompanying drawings:

figure 1 is a schematic structural view of the present invention,

fig. 2 is a schematic diagram showing the connection relationship between the electric devices according to the present invention.

In the figure: the device comprises an ultrasonic stirrer 1, a buffer tank 2, a feed liquid tank 3, a low-temperature concentrator 4, an infusion pump 5, an ultrafiltration membrane module 6, a first flowmeter 71, a second flowmeter 72, a tenth valve 80, a first valve 81, a second valve 82, a third valve 83, a fourth valve 84, a fifth valve 85, a sixth valve 86, a seventh valve 87, an eighth valve 88, a ninth valve 89, a venturi tube 9, a filter 10, a liquid outlet cylinder 11, a filter screen 12, a salinity sensor 13, a pressure regulating valve 14 and a defoamer 15.

Detailed Description

As shown in fig. 1 and 2, the ultrafiltration desalination system for ultrasonic-assisted salted egg white comprises an ultrasonic stirrer 1, wherein a water inlet pipe and an egg white pipe are communicated with a liquid inlet of the ultrasonic stirrer 1, a liquid outlet of the ultrasonic stirrer 1 is communicated with the upper end of a buffer tank 2 through a mixed flow pipe, the bottom of the buffer tank 2 is communicated with a material liquid tank 3 through a liquid discharge pipe, the upper end and the lower end of the material liquid tank 3 are respectively communicated with an ultrafiltration membrane assembly 6 through a liquid return pipe and a filter pipe, an infusion pump 5 is installed on the filter pipe, the bottom of the material liquid tank 3 is communicated with a low-temperature concentrator 4 through a discharge pipe, and a discharge valve is installed on the discharge pipe.

Be equipped with a liquid section of thick bamboo 11 in buffer tank 2, be equipped with filter screen 12 in the liquid section of thick bamboo 11, mixed flow pipe and the intercommunication of 11 one end of a liquid section of thick bamboo, install defoamer 15 on buffer tank 2, install basket filter 10 and first valve 81 on mixed flow pipe, install second valve 82 on the fluid-discharge tube, basket filter 10 is arranged in carrying out prefilter to the impurity in the salted egg liquid, uses after a period, needs to clear up basket filter 10.

The egg liquid pipe and the water inlet pipe are communicated with the liquid inlet of the ultrasonic wave stirring machine 1 through a Venturi tube 9, a third valve 83 and a first flowmeter 71 are arranged on the egg liquid pipe, and a fourth valve 84 and a second flowmeter 72 are arranged on the water inlet pipe.

The salinity sensor 13 and a liquid level meter are arranged on the feed liquid tank 3.

And the salinity sensor 13, the first flow meter 71 and the second flow meter 72 transmit detected data to the controller, and the controller controls the first valve 81, the second valve 82, the third valve 83, the fourth valve 84, the infusion pump 5, the ultrasonic stirrer 1 and the defoamer 15. The controller is a PLC controller, and the first valve 81, the second valve 82, the third valve 83 and the fourth valve 84 are all electromagnetic valves.

The implementation process of the invention is as follows:

step 1: and opening a third valve 83 and a fourth valve 84, feeding the deionized water and the salted egg liquid into a Venturi tube 9 for mixing, then feeding the mixed liquid into an ultrasonic stirrer 1, stirring the salted egg liquid and the water into a mixed liquid by the ultrasonic stirrer 1, and simultaneously detecting the flow rate of the salted egg liquid and the water by a first flow meter 71 and a second flow meter 72, wherein the ratio of the water to the salted egg liquid is 3:1, and the volume of the mixed liquid is not more than the volume of the buffer tank 2.

Step 2: the water of the mixed liquid after passing through the ultrasonic stirrer 1 is filtered by impurities through a basket filter 10 and then is sent into a liquid outlet cylinder 11, the mixed liquid is cut by a plurality of layers of filter screens 12 in the liquid outlet cylinder 11 to form egg liquid bubbles, and then the egg liquid bubbles are defoamed by a defoamer 15 for 10 minutes and then are recovered to be liquid;

and step 3: then the controller opens the second valve 82 to let the egg liquid enter the feed liquid tank 3, and the egg liquid is sent to the ultrafiltration membrane component 6 by the infusion pump 5 to carry out cyclic desalination for 3-6 times;

and 4, step 4: after the salinity of the egg liquid is detected by the salinity sensor 13 to reach the set concentration, the controller controls the infusion pump 5 to stop the operation, the desalting is stopped, finally the desalted egg liquid is sent to the low-temperature thickener 4, the redundant water is removed by the low-temperature thickener 4, and the concentration of the salted egg liquid is improved.

Install fifth valve 85 on the liquid return pipe, install sixth valve 86 on the filter tube, the liquid return pipe between fifth valve 85 and feed liquid jar 3 communicates with the filter tube between sixth valve 86 and milipore filter subassembly 6 through first flushing pipe, the liquid return pipe between fifth valve 85 and milipore filter subassembly 6 communicates with the filter tube between sixth valve 86 and transfer pump 5 through the second flushing pipe, install seventh valve 87 on first flushing pipe, install eighth valve 88 on the second flushing pipe, install ninth valve 89 on the milipore filter subassembly 6 waste liquid pipe, communicate the liquid residual pipe in feed liquid jar 3 bottom, install tenth valve 80 on the liquid residual pipe.

After the salted egg liquid is desalted, the ultrafiltration membrane component 6, the feed liquid tank 3, the filter pipe and the liquid return pipe can be backwashed, and the backwashing process is as follows: closing a fifth valve 85 on the liquid return pipe and a sixth valve 86 on the filter pipe, opening a second valve 82, a fourth valve 84, a seventh valve 87, an eighth valve 88 and a tenth valve 80, discharging residual salted egg liquid in the venturi tube 9, the ultrasonic stirrer 1, the buffer tank 2 and the feed liquid tank 3 after being washed by deionized water in sequence from the residual liquid pipe, closing the tenth valve 80 after washing for 10-20 minutes, filling the buffer tank 2 with the deionized water to a high liquid level, closing the second valve 82, then starting the infusion pump for 55 minutes, washing the ultrafiltration membrane module 6 by the deionized water, then opening the tenth valve 80 on the residual liquid pipe, and discharging the washed water from the residual liquid pipe.

Claims

1. Ultrasonic-assisted salted egg white ultrafiltration desalination system, its characterized in that: including ultrasonic mixer (1), inlet tube and egg white pipe intercommunication ultrasonic mixer (1) inlet, ultrasonic mixer (1) liquid outlet passes through mixed flow pipe and buffer tank (2) upper end intercommunication, and drain pipe intercommunication feed liquor jar (3) are passed through to buffer tank (2) bottom, and both ends communicate with ultrafiltration membrane module (6) through liquid return pipe and filter tube respectively about feed liquor jar (3), install transfer pump (5) on the filter tube, and feed liquor jar (3) bottom is through arranging material pipe and low temperature concentration machine (4) intercommunication.

2. The ultrasonic-assisted salted egg white ultrafiltration and desalination system of claim 1, which is characterized in that: a liquid outlet cylinder (11) is arranged in the buffer tank (2), a plurality of layers of filter screens (12) are arranged in the liquid outlet cylinder (11), a mixed flow pipe is communicated with one end of the liquid outlet cylinder (11), a defoamer (15) is arranged on the buffer tank (2), a filter (10) and a first valve (81) are arranged on the mixed flow pipe, and a second valve (82) is arranged on the liquid discharge pipe.

3. The ultrasonic-assisted salted egg white ultrafiltration and desalination system of claim 2, wherein: the egg liquid pipe and the water inlet pipe are communicated with a liquid inlet of the ultrasonic stirrer (1) through a Venturi tube (9), a third valve (83) and a first flowmeter (71) are installed on the egg liquid pipe, and a fourth valve (84) and a second flowmeter (72) are installed on the water inlet pipe.

4. The ultrasonic-assisted salted egg white ultrafiltration and desalination system of claim 3, which is characterized in that: a salinity sensor (13) and a liquid level meter are arranged on the feed liquid tank (3).

5. The ultrasonic-assisted salted egg white ultrafiltration and desalination system of claim 3, which is characterized in that: the device further comprises a controller, wherein the salinity sensor (13), the first flow meter (71) and the second flow meter (72) transmit detected data to the controller, and the controller controls the first valve (81), the second valve (82), the third valve (83), the fourth valve (84), the infusion pump (5), the ultrasonic stirrer (1) and the defoamer (15).

6. The ultrasonic-assisted salted egg white ultrafiltration and desalination system of any one of claims 1 to 5, which is characterized in that: install fifth valve (85) on liquid return pipe, install sixth valve (86) on the filter tube, the liquid return pipe between fifth valve (85) and feed liquid jar (3) is through first flushing pipe with the filter tube intercommunication between sixth valve (86) and milipore filter subassembly (6), the liquid return pipe between fifth valve (85) and milipore filter subassembly (6) is through second flushing pipe with the filter tube intercommunication between sixth valve (86) and transfer pump (5), install seventh valve (87) on first flushing pipe, install eighth valve (88) on the second flushing pipe, feed liquid jar (3) bottom intercommunication residual liquid pipe, install tenth valve (80) on the residual liquid pipe.

7. A method for desalting salted egg white using the ultrasonic-assisted salted egg white ultrafiltration desalting system of claim 5, which is characterized by comprising the steps of:

step 1: mixing the metered salted egg liquid and deionized water through a Venturi tube (9), and then sending the mixed liquid into an ultrasonic stirrer (1), wherein the salted egg liquid and the water are mixed by the ultrasonic stirrer (1);

step 2: filtering impurities in the mixed solution mixed by the ultrasonic stirrer (1) through a basket filter (10), feeding the mixed solution into a liquid outlet cylinder (11), cutting the mixed solution through a plurality of layers of filter screens (12) in the liquid outlet cylinder (11) to form egg liquid bubbles, defoaming the egg liquid bubbles through a defoamer (15), and recovering the egg liquid bubbles to be in a liquid state;

and step 3: the mixed solution enters a feed liquid tank (3), and the egg liquid is sent to an ultrafiltration membrane component (6) by an infusion pump (5) for circular desalination;

and 4, step 4: when the salinity of the egg liquid detected by the salinity sensor (13) reaches the set requirement, the desalting is stopped, and the desalted egg liquid is sent to a low-temperature thickener (4) for dewatering.