Low-loss and high-efficiency membrane filtration treatment device for soy sauce

Abstract

The utility model discloses a soy sauce low-loss high-efficiency membrane filtration treatment device which comprises a circulating tank, a feeding pump and a prefilter which are sequentially communicated, the prefilter and the circulating pump are communicated with an inlet of a membrane device, a clear liquid side inlet of the membrane device is communicated with a constant-pressure tank, and an outlet and a clear liquid side outlet of the membrane device are communicated with the constant-pressure tank and a clear liquid tank. The flushing tank is communicated with an inlet of the membrane device through the dissolved air pump and the flushing pump, and an outlet of the membrane device is communicated with the circulating pump, the circulating tank and the flushing tank. According to the utility model, a plurality of membrane assemblies run in parallel, and long-period continuous operation of membrane equipment and ultra-low loss of soy sauce permeate liquid are realized by balancing pressure on two sides of a membrane surface and a high-speed membrane surface air-water flushing technology, so that the soy sauce membrane treatment filtering efficiency and the product yield are improved.

Description

Technical Field

[0001] This utility model relates to a low-loss, high-efficiency membrane filtration treatment device for soy sauce, belonging to the field of condiment production technology. Background Technology

[0002] Soy sauce, a widely used condiment globally, relies heavily on clarification and filtration processes during its production. Traditional soy sauce production often employs methods such as heating and diatomaceous earth filtration for clarification, but these methods suffer from high energy consumption, flavor degradation, and solid waste pollution. With the development of membrane separation technology, its application in soy sauce clarification and filtration has gradually increased, as it can achieve solid-liquid separation while preserving the original flavor and nutrients of the soy sauce. However, existing membrane filtration technology still faces challenges in soy sauce applications, such as membrane fouling recovery, difficulty in maintaining high-flux processing efficiency, frequent chemical cleaning, and high product loss in the filtered liquid. These issues limit the further application and promotion of membrane filtration technology in the soy sauce industry.

[0003] Patent document CN 101766290 A describes a method for producing pure raw soy sauce using membrane filtration technology. This method removes unwanted proteins through a 0.1–0.45 μm hollow fiber micromembrane column, extending shelf life and preserving the original flavor of the soy sauce. However, this technology is only a simple experimental setup, with low cross-flow filtration speed and problems such as short high-flux retention time, severe membrane fouling, and short chemical cleaning cycles. Patent document CN 111296817A relates to an inorganic ceramic membrane clarification process for soy sauce. This patent uses ultrafiltration membrane separation technology to directly filter raw soy sauce, removing bacteria and large molecules. The technology mentions that "every 5-10 minutes of operation, the membrane modules in the ultrafiltration membrane system are instantaneously backwashed, with each membrane module backwashing for approximately 3-5 seconds. While the membrane modules are being instantaneously backwashed, other membrane modules can operate normally." Although the document does not mention the material used for backwashing, it can be inferred that the backwash liquid may be soy sauce that has permeated through the membrane. Therefore, this patented technology has the potential to cause increased soy sauce loss through the membrane and frequent discharge of unfiltered soy sauce from the membrane chamber due to frequent backwashing, reducing the effective continuous operation time of the membrane device. Furthermore, the backwashing may result in contaminants that have already been washed off re-adhering to the membrane surface under subsequent increases in operating pressure, accelerating membrane fouling, reducing the backwashing effect, shortening the continuous operation cycle of the membrane device, and increasing the number of shutdowns for chemical cleaning. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to achieve long-term continuous operation of membrane equipment and ultra-low loss of soy sauce permeate, and improve the filtration efficiency and product yield of soy sauce membrane treatment.

[0005] To address the aforementioned problems, this utility model provides a low-loss, high-efficiency membrane filtration treatment device for soy sauce, comprising a circulation tank, a feed pump, and a pre-filter connected in sequence. The outlets of the pre-filter and the circulation pump are connected to the inlet of the membrane device. The clear liquid side inlet of the membrane device is connected to the outlet of the constant pressure tank. The clear liquid side outlet of the membrane device is connected to the constant pressure tank and the clear liquid tank. The rinsing tank is connected to the inlet of the membrane device via a dissolved air pump and a rinsing pump. The outlets of the dissolved air pump and the rinsing pump are also connected to the rinsing tank to form a loop. The outlet of the membrane device is connected to the inlet of the circulation pump, the circulation tank, and the rinsing tank.

[0006] Preferably, the circulation tank is equipped with level gauges for monitoring high and low liquid levels. Feeding stops when the liquid level is high, new material is added when the liquid level is low, and the equipment is protected against ultra-low liquid levels. New material is supplied from the previous process.

[0007] Preferably, the liquid outlet of the constant pressure tank is located at the bottom of the constant pressure tank, and the top of the constant pressure tank is provided with an air inlet, an air outlet, and a liquid replenishment port. The air outlet is connected to a vent valve, the air inlet is connected to compressed air in sequence through an air inlet valve and a pressure reducing valve, and the liquid replenishment port is connected to the clear liquid side outlet of the membrane device.

[0008] Preferably, the feed pump is a fixed-frequency pump.

[0009] Preferably, the circulating pump and flushing pump are variable frequency centrifugal pumps.

[0010] Preferably, the dissolved air pump is a gas-liquid mixing pump capable of generating microbubbles of 20 to 150 micrometers.

[0011] Preferably, the rinsing tank is divided into a reflux zone, a defoaming zone, and a non-foaming zone by a partition; the bottom of the reflux zone and the defoaming zone are connected, and the defoaming zone and the non-foaming zone are replenished by gravity flow through the liquid level difference; both the defoaming zone and the non-foaming zone are equipped with level gauges to monitor the liquid level in the area, which are interlocked with the dissolved air pump and the rinsing pump for control; the top of the reflux zone is connected to the clear liquid outlet of the membrane device, and the bottom of the reflux zone is equipped with a sludge hopper for collecting pollutants detached from the rinsing membrane; the inlets of the dissolved air pump and the rinsing pump are both connected to the bottom of the non-foaming zone.

[0012] Preferably, the membrane device includes one or more membrane modules. Each membrane module has an inlet at the bottom and an outlet at the top, with a clear liquid side inlet and a clear liquid side outlet on the upper two sides, respectively. The inlet of each membrane module is connected to the outlet of the pre-filter and the circulating pump through a circulation inlet valve. The inlet of each membrane module is connected to the outlet of the dissolved gas pump and the rinsing pump through a flushing inlet valve. The outlet of each membrane module is connected to the rinsing tank through a flushing outlet valve. The outlet of each membrane module is connected to the inlet of the circulating tank and the circulating pump through a circulation outlet valve. The clear liquid side inlet of each membrane module is connected to the constant pressure tank through a clear liquid constant pressure inlet valve. The clear liquid side outlet of each membrane module is connected to a clear liquid outlet valve, which is connected to the replenishment port of the constant pressure tank and the clear liquid tank through a three-way valve, respectively.

[0013] More preferably, the membrane module of the membrane device is provided with multiple membrane tubes; the membrane module is provided with a pressure sensor for monitoring the operating pressure value.

[0014] More preferably, the outlets of the dissolved air pump and the flushing pump are connected to the flushing tank through a drain valve, and the outlet of the dissolved air pump is also equipped with a check valve.

[0015] The application of the aforementioned low-loss, high-efficiency membrane filtration treatment device for soy sauce includes the following steps:

[0016] Step 1: Membrane module operation with material;

[0017] Step 2: Stop feeding the membrane module;

[0018] Step 3: Replenishing water and pressurizing the constant pressure tank;

[0019] Step 4: High-speed rinsing of the membrane module;

[0020] Step 5: Gas-liquid flushing of the membrane module;

[0021] Step 6: Membrane module venting and flushing;

[0022] Step 7: Resume membrane module operation with material feeding;

[0023] Step 8: Switch to other membrane modules for flushing.

[0024] Preferably, the application of the soy sauce low-loss, high-efficiency membrane filtration treatment device includes the following steps:

[0025] Step 1: When the soy sauce level in the circulating tank reaches the specified level, open the circulating inlet valve and the circulating outlet valve in sequence, and start the feed pump. After the liquid returns from the top of the circulating tank, start the circulating pump. After the circulating pump runs to the specified frequency, open the clear liquid outlet valve and the three-way valve to discharge the soy sauce permeate generated by the membrane device into the clear liquid tank.

[0026] Step 2: After the membrane modules have run for the set time, some of the membrane modules are gradually flushed online. The steps for flushing one membrane module online are as follows: close the circulation outlet valve and the clean liquid outlet valve of the membrane module, open the flushing outlet valve, and after the flushing tank reaches the specified liquid level, close the circulation inlet valve and the drain valve, open the flushing inlet valve, and stop feeding the membrane module; at the same time, automatically control the operating frequency of the circulation pump to keep the operating pressure of other membrane modules the same as before the membrane module stopped feeding.

[0027] Step 3: Open the vent valve, switch the three-way valve to allow the soy sauce permeate to flow into the constant pressure tank. Once the specified liquid level is reached, switch the three-way valve to allow the soy sauce permeate to flow into the clear liquid tank. Close the vent valve, open the air inlet valve, and set the pressure reducing valve to the specified pressure to ensure that the pressure inside the constant pressure tank is consistent with the membrane chamber pressure of the membrane module.

[0028] Step 4: Turn on the flushing pump. Once the flushing pump reaches the specified frequency, open the clear liquid constant pressure inlet valve of the membrane module. The pressure difference between the inside and outside of the membrane surface in the membrane module is zero. The contaminants on the membrane surface are removed by the high-speed membrane surface flow, which reduces the fouling rate of the membrane surface. The flushing time is 3 to 10 minutes.

[0029] Step 5: After the high-speed rinsing time of the membrane module is completed, first close the clear liquid constant pressure inlet valve, then turn on the dissolved air pump until the pressure inside the membrane module reaches the specified value. Then adjust the pressure reducing valve until the pressure in the constant pressure tank is consistent with the pressure inside the membrane module, and open the clear liquid constant pressure inlet valve. With the rinsing pump and dissolved air pump running together, a high-speed gas-liquid mixture is generated on the membrane surface of the membrane module, further rinsing the contaminants on the membrane surface. Under the constant pressure balance of the constant pressure tank, the contaminants on the membrane surface are not squeezed by external force. The high-speed flowing water containing microbubbles cuts the contaminants attached to the membrane surface, making the membrane surface easy to clean and reducing the loss of soy sauce permeate during the membrane cleaning process. This process of membrane surface gas-liquid rinsing takes 5-10 minutes.

[0030] Step 6: Turn off the dissolved air pump and simultaneously adjust the pressure reducing valve to make the pressure inside the constant pressure tank the same as the pressure of the membrane module. Use the flushing pump to deliver soy sauce liquid without air bubbles to flush the membrane surface for 1 to 5 minutes. The purpose of this process is to remove the air bubbles remaining in the membrane module due to the gas-liquid flushing, so as to avoid the air bubbles being carried into the continuous feed circulation system in subsequent steps, causing system instability and reducing the risk of cavitation of the circulation pump impeller.

[0031] Step 7: Open the circulation outlet valve, simultaneously close the flushing outlet valve and the clear liquid constant pressure inlet valve, close the flushing inlet valve and the flushing pump, and open the circulation inlet valve; simultaneously adjust the operating frequency of the circulation pump to be consistent with that before cleaning; after 1 to 2 minutes, open the clear liquid outlet valve, and the membrane module will resume operation with material.

[0032] Step 8: Switch to other membrane modules for rinsing. The rinsing steps are the same as steps 1 to 7. Once other membrane modules have reached the operating cleaning conditions, the above steps can be repeated.

[0033] More preferably, the circulation pump operating at a specified frequency specifically means: the membrane equipment operating pressure reaches a specified value; in the eighth step, the other membrane components reaching the operating cleaning conditions specifically means: reaching a set operating time.

[0034] Compared with existing technologies, this invention addresses the shortcomings of short continuous operating time and large loss of soy sauce permeate volume during backwashing in existing soy sauce membrane processing. Through innovative multi-membrane component parallel operation design and gas-liquid flushing technology that balances membrane pressure, it significantly improves the continuous operating time of the equipment, reduces the loss of soy sauce permeate rate during flushing, effectively mitigates membrane fouling, maintains high membrane flux operation, extends the chemical cleaning cycle, and shortens downtime for maintenance. This greatly improves the production utilization efficiency of the equipment and the permeate product yield, achieving a resource-saving and environmentally friendly production process, demonstrating its technological advancement and application value in the field of soy sauce membrane processing. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the low-loss, high-efficiency membrane filtration treatment device for soy sauce provided in Example 1. Detailed Implementation

[0036] To make this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0037] The equipment selected in this utility model are all commercially available products, and the specific selections are as follows:

[0038] Circulation tank, model: HSSUS-316-10, China Haicheng Engineering Technology Co., Ltd.;

[0039] Feed pump, model: NISO-100-65-200G / 11, Nanfang Pump Industry Co., Ltd.;

[0040] Pre-filter, model: DN65-5 bag, Henan Ketewei Environmental Protection Equipment Co., Ltd.;

[0041] Circulating pump, model: NISO-65-40-200 / 22, manufactured by Nanfang Pump Industry Co., Ltd.

[0042] Membrane device, model: HSGSCI-60, China Haicheng Engineering Technology Co., Ltd.;

[0043] Dissolved gas pump, model: 50EDQS75S, Shanghai Yidun Electromechanical Equipment Co., Ltd.;

[0044] Flushing pump, model: NISO-100-65-200G / 15, manufactured by Nanfang Pump Industry Co., Ltd.

[0045] Flushing tank, model: HSSUSTAN-316-5, China Haicheng Engineering Technology Co., Ltd.

[0046] Constant pressure tank, model: A28W-16P, Zhejiang Fuyu Valve Manufacturing Co., Ltd.

[0047] Clear liquid tank, model: HSSUSTAN-316-8, China Haicheng Engineering Technology Co., Ltd.

[0048] Automatic control valve, model: Q681F-16RL series, Zhejiang Linuo Fluid Control Technology Co., Ltd.

[0049] Example 1

[0050] like Figure 1 As shown, this embodiment provides a low-loss, high-efficiency membrane filtration treatment device for soy sauce, which includes a circulation tank E-1, a feed pump E-2, and a pre-filter E-3 connected in sequence. The outlets of the pre-filter E-3 and the circulation pump E-4 are connected to the inlet of the membrane device E-5. The clear liquid side inlet of the membrane device E-5 is connected to the outlet of the constant pressure tank E-9. The clear liquid side outlet of the membrane device E-5 is connected to the constant pressure tank E-9 and the clear liquid tank E-10. The rinsing tank E-8 is connected to the inlet of the membrane device E-5 through a dissolved air pump E-6 and a rinsing pump E-7. The outlets of the dissolved air pump E-6 and the rinsing pump E-7 are also connected to the rinsing tank E-8 to form a loop. The outlet of the membrane device E-5 is connected to the inlet of the circulation pump E-4, the circulation tank E-1, and the rinsing tank E-8.

[0051] The circulating tank E-1 is equipped with level gauges for monitoring high and low liquid levels.

[0052] The liquid outlet of the constant pressure tank E-9 is located at the bottom of the constant pressure tank E-9. The top of the constant pressure tank E-9 is provided with an air inlet, an air outlet, and a liquid replenishment port. The air outlet is connected to a vent valve V-19. The air inlet is connected to compressed air in sequence through an air inlet valve V-20 and a pressure reducing valve V-22. The liquid replenishment port is connected to the clear liquid side outlet of the membrane device E-5.

[0053] The feed pump E-2 is a fixed-frequency pump, the circulation pump E-4 and the flushing pump E-7 are variable-frequency centrifugal pumps, and the dissolved air pump E-6 is a gas-liquid mixing pump that can generate microbubbles of 20 to 150 micrometers.

[0054] The rinsing tank E-8 is divided into a reflux zone, a defoaming zone, and a non-foaming zone by a partition. The bottom of the reflux zone and the defoaming zone are connected, and the defoaming zone and the non-foaming zone are replenished by gravity flow through the liquid level difference. Both the defoaming zone and the non-foaming zone are equipped with level gauges to monitor the liquid level in the area, which are interlocked with the dissolved air pump E-6 and the rinsing pump E-7. The top of the reflux zone is connected to the outlet of the membrane device E-5, and the bottom of the reflux zone is equipped with a sludge hopper for collecting pollutants detached from the rinsing membrane. The inlets of the dissolved air pump E-6 and the rinsing pump E-7 are both connected to the bottom of the non-foaming zone.

[0055] The membrane device E-5 includes three membrane modules, namely membrane module 1, membrane module 2, and membrane module 3; each membrane module has multiple membrane tubes; the bottom of the membrane module has an inlet, the top has an outlet, and the upper two sides have a clear liquid side inlet and a clear liquid side outlet, respectively. The inlets of membrane modules #1, #2, and #3 are connected to the outlets of pre-filter E-3 and circulating pump E-4 via circulation inlet valves V-1, V-2, and V-3, respectively. The inlets of membrane modules #1, #2, and #3 are connected to the outlets of dissolved air pump E-6 and flushing pump E-7 via flushing inlet valves V-7, V-8, and V-9, respectively. The outlets of membrane modules #1, #2, and #3 are connected to flushing tank E-8 via flushing outlet valves V-13, V-14, and V-15, respectively. The outlets of membrane modules #1, #2, and #3 are connected to circulating tank E-8 via circulation outlet valves V-4, V-5, and V-6, respectively. -1. The inlet of circulating pump E-4 is connected to the clear liquid side inlets of membrane modules 1, 2, and 3, which are respectively connected to constant pressure tank E-9 through clear liquid constant pressure inlet valve 1 V-16, clear liquid constant pressure inlet valve 2 V-17, and clear liquid constant pressure inlet valve 3 V-18. The clear liquid side outlets of membrane modules 1, 2, and 3 are respectively connected to clear liquid outlet valve 1 V-10, clear liquid outlet valve 2 V-11, and clear liquid outlet valve 3 V-12. Clear liquid outlet valve 1 V-10, clear liquid outlet valve 2 V-11, and clear liquid outlet valve 3 V-12 are all connected to the replenishment port of constant pressure tank E-9 and clear liquid tank E-10 through three-way valve V-21. The outlets of dissolved gas pump E-6 and flushing pump E-7 are connected to flushing tank E-8 through drain valve V-23. The outlet of dissolved gas pump E-6 is also equipped with check valve V-24.

[0056] Example 2

[0057] The application of the low-loss, high-efficiency membrane filtration treatment device for soy sauce in Example 1 includes the following specific steps:

[0058] Step 1: Membrane module operation with feed. When the soy sauce level in circulation tank E-1 reaches 85%, sequentially open circulation inlet valve 1 V-1, circulation inlet valve 2 V-2, circulation inlet valve 3 V-3, and circulation outlet valve 1 V-4, circulation outlet valve 2 V-5, and circulation outlet valve 3 V-6. Start feed pump E-2. After liquid returns from the top of circulation tank E-1, start circulation pump E-4. When circulation pump E-4 reaches the specified frequency of 45Hz and the membrane module operating pressure reaches 0.25MPa, open clear liquid outlet valve 1 V-10, clear liquid outlet valve 2 V-11, clear liquid outlet valve 3 V-12, and three-way valve V-21 to discharge the soy sauce permeate generated during membrane operation into the clear liquid tank.

[0059] Step 2: Stop feeding the membrane module. After the membrane module has been running for 30 minutes, perform online flushing on membrane module #1. First, close the circulation outlet valve - V-4 and the clear liquid outlet valve - V-10, and open the flushing outlet valve - V-13. When both level gauges in the flushing tank E-8 are above 70%, close the circulation inlet valve - V-1 and the drain valve - V-23, and open the flushing inlet valve - V-7, stopping the flow of liquid into membrane module #1 from the outlet pipe of circulation pump E-4. At the same time, automatically adjust the operating frequency of circulation pump E-4 to 39Hz to keep the operating pressure of other membrane modules constant at 0.25MPa.

[0060] Step 3: Replenishing and pressurizing the constant pressure tank E-9. First, open the vent valve V-19, switch the three-way valve V-21 to allow the soy sauce permeate to flow into the constant pressure tank E-9. When the liquid level reaches 80%, switch the three-way valve V-21 to allow the soy sauce permeate to flow into the clear liquid tank E-10. Close the vent valve V-19, then open the air inlet valve V-20, and adjust the pressure reducing valve V-22 until the pressure value of the constant pressure tank E-9 is 0.25 MPa.

[0061] Step 4: High-speed flushing of the membrane module. Turn on flushing pump E-7 and adjust its operating frequency to 40Hz. At this time, the pressure inside membrane module #1 is 0.25MPa. Open the clear liquid constant pressure inlet valve V-16. The pressure difference between the inside and outside of the membrane surface in membrane module #1 is zero. Contaminants on the membrane surface (such as easily removable mud cake) are removed by the high-speed membrane surface flow, reducing the membrane fouling rate. The flushing time is 5 minutes.

[0062] Step 5: Membrane module gas-liquid flushing. After the high-speed flushing time of membrane module #1 is completed, first close the clear liquid constant pressure inlet valve V-16, then turn on the dissolved gas pump E-6 until the pressure inside membrane module #1 reaches 0.3 MPa. Simultaneously adjust the pressure reducing valve V-22 until the pressure in the constant pressure tank E-9 matches the pressure inside membrane module #1, both being 0.3 MPa. Open the clear liquid constant pressure inlet valve V-16. With the flushing pump E-7 and the dissolved gas pump E-6 operating together, a high-speed gas-liquid mixture is generated on the membrane surface of membrane module #1, further flushing away contaminants. At the same time, under the constant pressure balance in the constant pressure tank E-9, the contaminants on the membrane surface are not squeezed by external force. The high-speed flowing water containing microbubbles cuts the contaminants attached to the membrane surface, making the membrane surface easy to clean and greatly reducing the loss of soy sauce permeate during membrane cleaning. This process of membrane surface gas-liquid flushing takes about 5 minutes.

[0063] Step 6: Membrane module venting and rinsing. Turn off dissolved gas pump E-6, and simultaneously adjust pressure reducing valve V-22 to ensure that the pressure inside constant pressure tank E-9 and the pressure of membrane module #1 are both 0.25MPa. Use rinsing pump E-7 to deliver bubble-free soy sauce solution to rinse the membrane surface for 1.5 minutes.

[0064] Step 7: Resume feed operation of the membrane module. Open valve V-4, simultaneously close valves V-13, V-16, and valve V-7, turn off the flushing pump (E-7), and open valve V-1; at the same time, automatically adjust the operating frequency of the circulation pump to 45Hz to maintain the membrane module operating pressure at 0.25MPa; after 1 minute, open the clear liquid outlet valve V-10, and membrane module #1 resumes feed operation.

[0065] Step 8: Switch to flushing other membrane modules. When membrane module #2 has been running for 1 hour, perform the same steps 1 to 7 as those for cleaning membrane module #1 (only change the corresponding valve number), and repeat the flushing steps. Continue this cycle to clean different membrane modules, achieving continuous low permeate loss and high-efficiency membrane filtration operation.

[0066] Comparative Example 1

[0067] Comparative Example 1 uses the same operating parameters as Example 2 above, but continuous feeding is used in Comparative Example 1, and no membrane module is rinsed during the operation.

[0068] The results of Example 2 and Comparative Example 1 are shown in Table 1.

[0069] Table 1 Comparison of flux changes during continuous operation of soy sauce filtration treatment in Example 2 and Comparative Example 1

[0070]

Claims

1. A low-loss, high-efficiency membrane filtration treatment device for soy sauce, characterized in that, The system includes a circulating tank (E-1), a feed pump (E-2), and a pre-filter (E-3) connected in sequence. The outlets of the pre-filter (E-3) and the circulating pump (E-4) are connected to the inlet of the membrane unit (E-5). The clear liquid side inlet of the membrane unit (E-5) is connected to the outlet of the constant pressure tank (E-9). The clear liquid side outlet of the membrane unit (E-5) is connected to the constant pressure tank (E-9) and the clear liquid tank (E-10). The rinsing tank (E-8) is connected to the inlet of the membrane unit (E-5) through a dissolved air pump (E-6) and a rinsing pump (E-7). The outlets of the dissolved air pump (E-6) and the rinsing pump (E-7) are also connected to the rinsing tank (E-8) to form a loop. The outlet of the membrane unit (E-5) is connected to the inlet of the circulating pump (E-4), the circulating tank (E-1), and the rinsing tank (E-8).

2. The low-loss, high-efficiency membrane filtration treatment device for soy sauce as described in claim 1, characterized in that, The circulating tank (E-1) is equipped with level gauges for monitoring high and low liquid levels.

3. The low-loss, high-efficiency membrane filtration treatment device for soy sauce as described in claim 1, characterized in that, The liquid outlet of the constant pressure tank (E-9) is located at the bottom of the constant pressure tank (E-9). The top of the constant pressure tank (E-9) is provided with an air inlet, an air outlet, and a liquid replenishment port. The air outlet is connected to a vent valve (V-19). The air inlet is connected to compressed air in sequence through an air inlet valve (V-20) and a pressure reducing valve (V-22). The liquid replenishment port is connected to the clear liquid side outlet of the membrane device (E-5).

4. The low-loss, high-efficiency membrane filtration treatment device for soy sauce as described in claim 1, characterized in that, The feed pump (E-2) is a fixed-frequency pump.

5. The low-loss, high-efficiency membrane filtration treatment device for soy sauce as described in claim 1, characterized in that, The circulating pump (E-4) and flushing pump (E-7) are variable frequency centrifugal pumps.

6. The low-loss, high-efficiency membrane filtration treatment device for soy sauce as described in claim 1, characterized in that, The dissolved air pump (E-6) is a gas-liquid mixing pump capable of generating microbubbles of 20 to 150 micrometers.

7. The low-loss, high-efficiency membrane filtration treatment device for soy sauce as described in claim 1, characterized in that, The rinsing tank (E-8) is divided into a reflux zone, a defoaming zone, and a non-foaming zone by a partition. The bottom of the reflux zone and the defoaming zone are connected, and the defoaming zone and the non-foaming zone are replenished by gravity flow through the liquid level difference. Both the defoaming zone and the non-foaming zone are equipped with level gauges to monitor the liquid level in the area, which are interlocked with the dissolved air pump (E-6) and the rinsing pump (E-7). The top of the reflux zone is connected to the outlet of the membrane device (E-5), and the bottom of the reflux zone is equipped with a sludge hopper for collecting pollutants detached from the rinsing membrane. The inlets of the dissolved air pump (E-6) and the rinsing pump (E-7) are both connected to the bottom of the non-foaming zone.

8. The low-loss, high-efficiency membrane filtration treatment device for soy sauce as described in any one of claims 1-7, characterized in that, The membrane device (E-5) includes one or more membrane modules. Each membrane module has an inlet at the bottom and an outlet at the top. The upper sides are respectively provided with a clear liquid side inlet and a clear liquid side outlet. The inlet of each membrane module is connected to the outlet of the pre-filter (E-3) and the circulation pump (E-4) through a circulation inlet valve. The inlet of each membrane module is connected to the outlet of the dissolved gas pump (E-6) and the flushing pump (E-7) through a flushing inlet valve. The outlet of each membrane module is connected to the flushing tank (E-8) through a flushing outlet valve. The outlet of each membrane module is connected to the inlet of the circulation tank (E-1) and the circulation pump (E-4) through a circulation outlet valve. The clear liquid side inlet of each membrane module is connected to the constant pressure tank (E-9) through a clear liquid constant pressure inlet valve. The clear liquid side outlet of each membrane module is connected to a clear liquid outlet valve. The clear liquid outlet valve is connected to the replenishment port of the constant pressure tank (E-9) and the clear liquid tank (E-10) through a three-way valve (V-21).

9. The low-loss, high-efficiency membrane filtration treatment device for soy sauce as described in claim 8, characterized in that, The membrane unit (E-5) has multiple membrane tubes inside its membrane module; the membrane module also has a pressure sensor for monitoring the operating pressure value.

10. The low-loss, high-efficiency membrane filtration treatment device for soy sauce as described in claim 8, characterized in that, The outlets of the dissolved air pump (E-6) and the flushing pump (E-7) are connected to the flushing tank (E-8) through the drain valve (V-23). ​​The outlet of the dissolved air pump (E-6) is also equipped with a check valve (V-24).

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