An unpowered automatic degassing external circulation bioreactor and water treatment method

Abstract

This disclosure relates to a non-powered automatic degassing external circulation bioreactor and water treatment method, which solves the problems of incomplete removal of microbubbles in existing external circulation biological fluidized beds, leading to gas accumulation in the circulation pump, and the excessive equipment investment, operating energy consumption, and floor space required by adding a separate degassing tank. Specifically, it includes an external circulation pipeline formed by a reactor tank, a gas escaping box, a circulating water tank, and a circulating pump connected in series. The gas escaping box is filled with mass transfer packing, and a closed gas collection chamber is formed above the packing. The gas escaping box enables the full diffusion of dissolved and undissolved gases in the water. The bottom of the escaping box is connected to a vertical pipe suspended above the outlet. During operation, the positive pressure of the gas collection chamber and the negative pressure generated by the downward liquid phase in the vertical pipe work together to complete two-stage gas-liquid separation. The packing initially precipitates dissolved gases, and the negative pressure strips away the microbubbles encapsulated in the liquid phase, ensuring that the bioreactor can achieve non-powered automatic circulation degassing without additional pumping power equipment. Moreover, the pipeline structure is simplified, and the overall operating cost is lower.

Description

Technical Field

[0001] This disclosure relates to the field of biological fluidized bed reactor technology, specifically to a non-powered automatic degassing external circulation bioreactor and a water treatment method. Background Technology

[0002] Biological fluidized beds possess excellent solid-liquid mass transfer properties and are widely used in the field of biological wastewater treatment. External circulation biological fluidized beds rely on an external circulation pump to drive fluid circulation and maintain fluidization of the carrier within the bed. However, aeration and biochemical gas generation within the reactor can cause a large number of air bubbles to be entrained in the circulating mixed liquid. When the circulating water carries gas into the external circulation pump, it can easily cause gas accumulation in the pump chamber, leading to pump instability and, in severe cases, cavitation and gas binding, shortening the pump's service life. Therefore, efficiently removing entrained gas from the circulating water is the core technical challenge of external circulation biological fluidized bed reactors.

[0003] Existing traditional degassing and cavitation prevention solutions can be mainly divided into the following three types: 1. Built-in three-phase separation and degassing scheme: A three-phase separation sedimentation zone is set up above the fluidized bed. During the upward flow of the gas-liquid-solid mixture, bubbles rise due to buoyancy and are discharged through the vent pipe at the top of the reactor, while the liquid phase and carrier settle downward. Only the low-gas-content mixture is connected to the external circulation pump's suction pipe, thereby reducing the gas content of the fluid at the pump inlet. The scheme is equipped with baffles, inverted cone gas collection hoods, overflow weirs, and other structures. This scheme has low equipment investment and requires no additional land, but the degassing effect is limited and cannot completely remove tiny bubbles from the water.

[0004] 2. External independent degassing buffer tank: An open or slightly negative pressure degassing buffer tank is added between the reactor reflux outlet and the external circulation pump inlet. The circulating mixture enters the tank tangentially, and gas-liquid separation is achieved through cyclone separation combined with static settling. The bubbles rise and are discharged from the top of the tank, while the low-gas-content liquid at the bottom is transported to the circulation pump. This was the mainstream degassing method in early external circulation fluidized beds. This scheme has a thorough degassing effect, but the addition of an independent tank has the disadvantages of increased equipment investment, space occupation, and additional hydraulic energy consumption.

[0005] 3. Optimization of Piping and Pump Installation: This involves using automatic / manual venting valves at high points in the piping system in conjunction with a reverse-flow pump installation to raise the return liquid level in the reactor or degassing tank. This allows liquid to flow into the pump chamber by its own weight, increasing the effective net positive suction head (NPSH) at the pump inlet and suppressing low-pressure vaporization and bubble formation. While this modification method is cost-effective, it only removes large bubbles accumulated in the piping and is insufficient to remove dissolved gases and tiny suspended bubbles from the water. It can only serve as an auxiliary measure and cannot fundamentally solve the problem of gas accumulation and cavitation in the pump chamber. Summary of the Invention

[0006] In view of this, this disclosure provides a non-powered automatic degassing external circulation bioreactor and water treatment method, which solves the problems of incomplete removal of microbubbles or excessive cost, energy consumption, and land occupation of the traditional degassing structure of existing external circulation biological fluidized bed.

[0007] To achieve the above-mentioned objectives, in a first aspect, the non-powered automatic degassing external circulation bioreactor disclosed herein comprises: an external circulation pipeline consisting of a reactor tank, a gas escaping box, a circulating water tank, and a circulating pump connected in series; The gas escaping box is filled with mass transfer packing, and a closed gas collection chamber is formed above the packing. The closed gas collection chamber is kept under positive pressure so that the liquid level in the gas escaping box is lower than the liquid level in the reactor tank. The pipeline on the side wall of the reactor tank is connected to the closed gas collection chamber, and the pipeline serves as both the water outlet of the tank and the exhaust channel of the gas collection chamber. The bottom of the gas escaping box is connected to a vertical pipe, and the outlet of the vertical pipe is suspended above the liquid surface of the circulating water tank. The outlet of the circulating water tank is connected to a circulating pump, and the water from the circulating pump flows back to the bottom of the reactor tank to form a closed loop. The downward liquid phase in the vertical pipe generates local static pressure, which is negative. The negative pressure and the positive pressure in the gas collection chamber work together to achieve degassing without power.

[0008] Preferably, a valve is provided at the lower end of the vertical pipe.

[0009] Preferably, the mass transfer packing is a bulk packing; the bulk packing is selected from any one of plastic Raschig rings, plastic stepped rings, plastic Pall rings, and multifaceted hollow spheres.

[0010] Preferably, an exhaust channel is provided at the upper end of the gas escaping box; the gas escaping box is a vertical pressure-bearing box, and the mass transfer packing is stacked inside the box.

[0011] Secondly, the non-powered automatic degassing method for the bioreactor described in this disclosure includes: Using any of the first aspects of the bioreactor, a circulating pump drives the water containing dissolved gas in the reactor tank to be sent into the gas escaping box through the side wall pipe. When the water flows through the mass transfer packing, the dissolved gas inside is released, floats and accumulates in the closed gas collection chamber. The continuous input of water and the continuous accumulation of gas create a stable positive pressure in the sealed gas collection chamber; the positive pressure lowers the liquid level inside the gas escaping box, ensuring that the side wall connection pipe is always in the gas phase space, so that water intake and exhaust can be carried out simultaneously. The liquid phase falls through the bottom vertical pipe, generating a negative pressure. The negative pressure, combined with the positive pressure in the gas collection chamber, enhances gas-liquid separation. After the liquid phase flows into the circulating water tank, it is returned to the bottom of the reactor tank by the circulating pump, continuously achieving degassing circulation without power.

[0012] Preferably, an adjustable valve is installed at the lower end of the vertical pipe. By adjusting the valve opening, the water head resistance of the pipeline is changed, and the negative pressure of the liquid phase in the vertical pipe is adjusted. The change in negative pressure synchronously changes the positive pressure inside the sealed gas collection chamber, thereby coordinating the adjustment of the fluid degassing degree.

[0013] Preferably, the larger the valve opening, the smaller the pipeline resistance, the higher the negative pressure of the liquid phase in the vertical pipe, the lower the positive pressure in the gas collecting chamber, and the stronger the fluid degassing effect.

[0014] Preferably, when the pressure inside the gas collecting chamber is too high, the exhaust channel at the top of the gas venting box is opened to release the pressure.

[0015] The present invention has the following beneficial effects: The non-powered automatic degassing external circulation bioreactor and water treatment method of the present invention eliminates the need for additional degassing tanks, vacuum pumps, and other powered degassing equipment, reducing equipment investment, operating energy consumption, and plant footprint. The reactor relies on the positive pressure of the gas collection chamber and the negative pressure of the liquid phase falling from the vertical pipe to form a two-stage gas-liquid separation. After the initial gas release by the mass transfer packing, the negative pressure can completely strip away the microbubbles entrained in the liquid phase, solving the defect of incomplete removal of microbubbles. It adopts a single-pipe synchronous water intake and exhaust, simplifying the pipeline layout. The entire process is hydraulically self-driven for continuous automatic degassing, and the degassing intensity can be steplessly adjusted through the vertical pipe valve to adapt to different water treatment biochemical conditions. The operation is stable, avoiding pump cavitation and reactor gas accumulation that disturbs the microbial system, resulting in lower overall operating costs. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the specification, serve to illustrate the technical solutions of this disclosure.

[0017] Figure 1 This is a schematic diagram of the structure of the non-powered automatic degassing external circulation bioreactor described in the embodiments of this disclosure; In the diagram: Reactor tank-1, Circulation pump-2, Circulation water tank-3, Valve-4, Vertical pipe-5, Packing-6, Gas escaping box-7, Exhaust channel-8, Side wall pipe-9. Detailed Implementation

[0018] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. Although various aspects of embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise. The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0019] To address the technical problems described in the background, the technical concept of the non-powered automatic degassing external circulation bioreactor disclosed in this disclosure is as follows: The reactor includes an external circulation pipeline consisting of a reactor tank, a gas escaping chamber, a circulating water tank, and a circulating pump connected in series. The gas escaping chamber is filled with mass transfer packing material. When water flows through the mass transfer packing material, the packing material can cut and disperse the water flow, increase the gas-liquid contact area, and prolong the residence time of the water in the gas phase space. The water flow disturbance can disrupt the dissolved gas balance in the liquid phase, causing dissolved gases in the water to precipitate and form bubbles. These bubbles are then intercepted and gathered, rising to the upper part of the gas escaping chamber to form a closed gas collection chamber, thus achieving primary gas-liquid separation. At the same time, microbial communities can attach to the packing material, simultaneously completing the biochemical mass transfer process. Water is continuously input, and gas only flows back to the reactor tank in small amounts through the same pipeline. The continuous accumulation of gas creates a stable positive pressure in the sealed gas collection chamber. Because the sealed gas collection chamber maintains positive pressure, the liquid level in the gas escaping tank is lower than the liquid level in the reactor tank. The pipeline on the side wall of the reactor tank is connected to the sealed gas collection chamber, so the side wall pipeline can serve as both the reactor tank water outlet and the gas collection chamber exhaust function, simultaneously realizing the water inlet and exhaust of the external circulation pipeline. The bottom of the gas escaping box is connected to a vertical pipe, and the outlet of the vertical pipe is suspended above the liquid surface of the circulating water tank, with a suspension height of 5-10 times the diameter of the vertical pipe. The downward-flowing liquid phase inside the vertical pipe generates local static pressure, which is negative. This negative pressure, together with the positive pressure in the gas collecting chamber, achieves unpowered assisted degassing. Specifically, the mechanism by which the downward-flowing, high-speed liquid phase region inside the vertical pipe forms a local negative pressure, and this negative pressure synergistically achieves unpowered assisted degassing, is as follows: The high-speed downward flow of liquid in the vertical pipe creates local static pressure, which is negative. This negative pressure can counteract the system pressure buildup effect generated by the circulating pump in the loop. Changes in the positive pressure of the gas phase in the gas collecting chamber can alter the partial pressure of the gas phase, regulating the precipitation rate of dissolved gas inside the fluid and achieving stepless adjustment of the degassing degree. Simultaneously, the vertical pipe's liquid phase suction can continuously pull the liquid phase in the escape tank downwards, stably maintaining the liquid level in the escape tank below the main tank, ensuring normal feeding at the gas phase inlet on the side wall and stable accumulation and separation of air bubbles in the upper gas chamber. In addition, the packing layer inside the escape tank can only trap and separate large-diameter free air bubbles. A small number of fine air bubbles will be carried into the vertical pipe in the liquid phase. The local negative pressure of the liquid phase in the vertical pipe will reduce the internal static pressure of the liquid phase, causing the fine air bubbles to expand in volume, prompting them to detach and precipitate from the liquid phase. They will then enter the bottom storage tank with the liquid flow to complete secondary gas-liquid separation, further improving the overall degassing efficiency of the entire device.

[0020] The outlet of the circulating water tank is connected to the circulating pump. The water discharged from the circulating pump flows back to the bottom of the reactor tank to form a closed loop. Since the circulating water has already achieved continuous automatic degassing without power before entering the circulating pump, the problem of air accumulation in the circulating pump can be completely solved.

[0021] Based on the above technical concept, the present disclosure provides the following preferred embodiments.

[0022] Depend on Figure 1As shown, the non-powered automatic degassing external circulation bioreactor described in this embodiment includes an external circulation pipeline consisting of a reactor tank 1, a circulation pump 2, a circulating water tank 3, and a gas venting box 7 connected in series. Bulk packing material 6 is stacked inside the gas venting box 7. The lower end of the gas venting box 7 is connected to a vertical pipe 5. The pipe 9 on the upper side wall of the reactor tank 1 is connected to the sealed gas collection chamber at the upper part of the gas venting box 7. The outlet of the vertical pipe 5 is suspended above the liquid surface of the circulating water tank 3. The outlet of the circulating water tank 3 is connected to the circulation pump 2. The water discharged from the circulation pump 2 flows back to the bottom of the reactor tank 1, forming a closed circulation loop.

[0023] In this embodiment, a valve 4 is provided at the lower end of the vertical pipe 5; by adjusting the opening degree of the valve at the lower end of the vertical pipe to change the pipeline resistance, the suction intensity of the liquid phase negative pressure of the vertical pipe is further adjusted, and the gas phase positive pressure value of the gas collection chamber at the top of the escaping box is continuously changed, thereby achieving the purpose of controlling the precipitation rate of dissolved gas inside the fluid.

[0024] In this embodiment, the bulk packing is preferably selected from any one of plastic Raschig rings, plastic stepped rings, plastic Pall rings, and multi-faceted hollow spheres; in addition, the upper end of the gas venting box 7 is provided with an exhaust channel 8, which can realize the depressurization and exhaust of the gas collection chamber; it is also preferred that the gas venting box 7 is a vertical pressure-bearing box.

[0025] In this embodiment, the side wall pipe 9 is preferably an inclined pipe, and the inlet height of the inclined pipe is higher than its outlet height, while the liquid level of the gas escaping box 7 is lower than the inlet height of the inclined pipe, which is conducive to the smooth flow of gas phase discharge channel in the gas collection chamber.

[0026] The method for automatic degassing of a bioreactor based on this embodiment includes the following steps: S1. Water delivery: Start the circulation pump to drive the water containing dissolved gas in the reactor tank to be sent into the gas escaping box through the side wall connecting pipe. S2, Gas-liquid precipitation: Water passes through the mass transfer packing inside the gas escaping box, and dissolved gas in the water is released and floats to the sealed gas collection chamber above the packing. S3. Establish positive pressure in the chamber: Water is continuously input into the closed gas collection chamber, and the gas released only flows back to the reactor tank in a small amount along the side wall connecting pipe. The continuous accumulation of the medium makes a stable positive pressure form inside the closed gas collection chamber. S4. Maintaining the gas phase passage: The positive pressure of the sealed gas collection chamber reduces the liquid level inside the gas escaping box, so that the side wall connecting pipe is always in the gas phase area of ​​the gas collection chamber, and the water feeding and chamber gas return and exhaust are completed simultaneously. S5. Negative pressure synergistic enhancement of degassing: The degassed liquid phase falls suspended from the bottom of the gas escaping box through the vertical pipe. The descending liquid phase in the vertical pipe generates local static pressure, which is negative pressure. The negative pressure works synergistically with the positive pressure of the sealed gas collection chamber to further strip away the microbubbles encased in the liquid phase. S6. Closed-loop circulation: The liquid phase falls into the circulating water tank and is then pumped back to the bottom of the reactor tank by the circulating pump, continuously completing the automatic degassing circulation without power.

[0027] In this embodiment, an adjustable valve 4 is installed at the lower end of the vertical pipe. By adjusting the opening of valve 4, the water head resistance in the pipeline is changed, thereby adjusting the negative pressure of the liquid phase inside the vertical pipe. The change in negative pressure synchronously changes the positive pressure inside the sealed gas collection chamber, thus synergistically regulating the degree of fluid degassing. The negative pressure value PV inside the vertical pipe can be adjusted by valve 7 at the lower end of the vertical pipe. The technical mechanism for achieving adjustable degassing is as follows: Let the head of the pressure gauge in the venting box be h0, the height of the vertical pipe be h1, and the water velocity in the vertical pipe be V when the valve opening degree is X. X When the valve opening degree is X, the resistance loss is ∑h X Let atmospheric pressure be Pa, and the pressure at outlet D of the evacuation box be P. X .

[0028] By establishing Bernoulli's equations for the water surface (0-0) and the outlet of the vertical pipe, the water flow velocity V inside the vertical pipe can be obtained. X： …(1) In the formula, V X - Water flow velocity inside the vertical pipe (m / s).

[0029] By establishing Bernoulli's equations for the water surface (0-0) and the vertical pipe (D), the negative pressure value P at the vertical pipe (D) is obtained. vx : …(2) In the formula, ∑h X - Resistance loss (m) when valve opening degree X; The specific gravity of γ-water is approximately 9.8 (kN / m³).

[0030] Therefore, by adjusting the valve opening degree, the pipe head resistance can be changed, thereby adjusting the negative pressure value P of the vertical pipe. vx P vx The relationship between the valve opening degree X and the valve opening degree X is shown in Table 1 and... Figure 1 As shown: Table 1. Negative pressure value P of the vertical pipe vx Relationship with valve opening degree X

[0031] As shown in Table 1, when the valve opening degree increases from 30% to 75%, the negative pressure value P in the vertical pipe at an opening degree of 30% also increases. V30 The negative pressure value P of the vertical pipe is less than 75% of the opening degree. V75 That is, by changing the valve opening degree, the negative pressure value of the vertical pipe can be changed to achieve automatic adjustment of the degassing degree.

[0032] Furthermore, the valve opening degree directly affects the negative pressure value of the vertical pipe, which can be visually represented by the pressure head line of the piezometer. When drawing the vertical pipe head line, it can be arranged horizontally instead. At the same time, to ensure that the position head line coincides exactly with the pipe axis, the baseline can be a 45º angled line with the horizontal line, such as... Figure 1 For the DD line, the water head at each section of the vertical pipe is measured from left to right, and the piezometric head line is as follows: Figure 1 The dashed lines AA, BB, CC, and DD are shown. For example, when the valve opening is X, the pressure head line of the piezometer is dashed line AA. At this time, the vertical pipe section AD is in a negative pressure (vacuum) state because the pressure head line of this section is to the left of the vertical pipe axis. Similarly, BB, CC, and DD are also shown. Therefore, by changing the valve opening, the negative pressure value of the vertical pipe can be changed, achieving controllable and adjustable degassing. The larger the valve opening, the smaller the pipeline resistance, the higher the negative pressure of the liquid phase in the vertical pipe, the lower the positive pressure in the gas collecting chamber, and the stronger the fluid degassing effect.

[0033] In this embodiment, when the pressure inside the gas collection chamber is too high, the exhaust channel 8 at the top of the gas escaping box is opened to release the pressure.

[0034] In summary, the non-powered automatic degassing method for bioreactors described in this embodiment has the following technical advantages compared to traditional degassing methods for reactors: 1. Self-degassing without power reduces energy consumption and operating costs. This method cleverly designs an escape box in the external circulation pipeline, which is filled with bulk packing material. A suspended vertical pipe is set at the bottom of the escape box. The external circulation water flow itself forms two types of pressure difference to achieve synergistic degassing: the sealed gas collection chamber continuously accumulates the precipitated gas to establish positive static pressure, and the liquid phase falling from the suspended vertical pipe spontaneously generates local negative pressure. The entire process does not require additional vacuum pumps, induced draft fans or other additional air extraction power equipment. Continuous gas-liquid separation can be achieved by relying only on the original circulation pump of the system to complete the fluid transportation, which greatly reduces the investment in supporting electromechanical equipment.

[0035] 2. Two-stage synergistic gas-liquid separation significantly improves degassing efficiency. The system employs a two-stage separation mechanism: primary degassing of the packing material followed by secondary microbubble stripping under negative pressure in the vertical pipe. As water flows through the bulk packing material, it is cut and dispersed, resulting in the release of dissolved gases and the aggregation and upward movement of tiny bubbles, completing the initial separation. Microbubbles that are not completely removed and remain trapped in the liquid phase enter the vertical pipe, where they expand under negative pressure and are stripped from the liquid. These bubbles then undergo secondary sedimentation and separation in the circulating water tank. This process significantly reduces the residual dissolved gas content in the liquid phase, completely resolving the problem of gas accumulation in the circulating pump. Simultaneously, it effectively eliminates issues such as gas accumulation, localized gas blockage, and membrane dead zones within the bioreactor, thus stabilizing the biochemical reaction environment.

[0036] 3. Single-pipe bidirectional flow simplifies pipeline structure and reduces leakage risk. Relying on the positive pressure in the gas collecting chamber to form a stable liquid level difference, the same pipeline on the side wall of the tank can simultaneously achieve liquid phase water intake and gas phase return exhaust, eliminating the need to set up separate water inlet pipes and exhaust pipes, simplifying the layout of the external circulation pipeline; at the same time, the gas phase in the gas collecting chamber is always connected to the medium in the upper part of the tank, avoiding overpressure blockage in the chamber, and no need for frequent manual start and stop of the exhaust valve during operation, achieving fully automatic continuous operation.

[0037] 4. The degassing degree is infinitely adjustable, adapting to various biochemical conditions. By adjusting the opening of the vertical pipe valve to change the water head resistance of the pipeline, the negative pressure of the liquid phase in the vertical pipe and the positive pressure inside the gas collection chamber are controlled in a synchronous linkage, and the dissolved gas release rate and degassing depth in the water are continuously and steplessly changed; the degassing intensity can be flexibly matched according to different fermentation stages of the bioreactor and different dissolved gas contents in the influent, making the process more adaptable.

[0038] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A non-powered, self-deaerating, external-circulation bioreactor, characterized in that, It includes an external circulation pipeline consisting of a reactor tank, a gas escaping box, a circulating water tank, and a circulating pump connected in series; The gas escaping box is filled with mass transfer packing, and a closed gas collection chamber is formed above the packing. The closed gas collection chamber is kept under positive pressure so that the liquid level in the gas escaping box is lower than the liquid level in the reactor tank. The pipeline on the side wall of the reactor tank is connected to the closed gas collection chamber, and the pipeline serves as both the water outlet of the tank and the exhaust channel of the gas collection chamber. The bottom of the gas escaping box is connected to a vertical pipe, and the outlet of the vertical pipe is suspended above the liquid surface of the circulating water tank. The outlet of the circulating water tank is connected to a circulating pump, and the water from the circulating pump flows back to the bottom of the reactor tank to form a closed loop. The downward liquid phase in the vertical pipe generates local static pressure, which is negative. The negative pressure and the positive pressure in the gas collection chamber work together to achieve degassing without power.

2. The bioreactor according to claim 1, characterized in that: A valve is installed at the lower end of the vertical pipe.

3. The bioreactor according to claim 1 or 2, characterized in that: The mass transfer packing is a bulk packing.

4. The bioreactor according to claim 3, characterized in that: The bulk packing material is selected from any one of plastic Raschig rings, plastic step rings, plastic Pall rings, and multifaceted hollow spheres.

5. The bioreactor according to claim 1 or 2, characterized in that: An exhaust channel is provided at the upper end of the gas venting box.

6. The bioreactor according to claim 1 or 2, characterized in that: The gas escaping box is a vertical pressure-bearing box, and the mass transfer packing is stacked inside the box.

7. A method for unpowered automated degassing of a bioreactor, characterized in that, include: Using the bioreactor described in any one of claims 1-6, a circulating pump drives the water containing dissolved gas in the reactor tank to be sent into the gas escaping box through the side wall pipe. When the water flows through the mass transfer packing, the dissolved gas inside is released, floats and accumulates in the closed gas collection chamber. The continuous input of water and the continuous accumulation of gas create a stable positive pressure in the sealed gas collection chamber; the positive pressure lowers the liquid level inside the gas escaping box, ensuring that the side wall connection pipe is always in the gas phase space, so that water intake and exhaust can be carried out simultaneously. The liquid phase falls through the bottom vertical pipe, generating a negative pressure. The negative pressure, combined with the positive pressure in the gas collection chamber, enhances gas-liquid separation. After the liquid phase flows into the circulating water tank, it is returned to the bottom of the reactor tank by the circulating pump, continuously achieving degassing circulation without power.

8. The non-powered automatic degassing method for a bioreactor according to claim 7, characterized in that: An adjustable valve is installed at the lower end of the vertical pipe. By adjusting the valve opening, the water head resistance of the pipeline is changed, and the negative pressure of the liquid phase in the vertical pipe is adjusted. The change in negative pressure synchronously changes the positive pressure inside the sealed gas collection chamber, thus coordinating the degree of fluid degassing.

9. The non-powered automatic degassing method for a bioreactor according to claim 8, characterized in that: The larger the valve opening, the smaller the pipeline resistance, the higher the negative pressure of the liquid phase in the vertical pipe, the lower the positive pressure in the gas collecting chamber, and the stronger the fluid degassing effect.

10. The non-powered automatic degassing method for a bioreactor according to any one of claims 7-9, characterized in that: When the pressure inside the gas collection chamber is too high, open the exhaust channel at the top of the gas venting box to release the pressure.

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