A gas phase bioreactor suitable for biological oxidation processes

Abstract

The patent technology relates to the technical field of bioreactor, and particularly relates to a gas-phase bioreactor suitable for biological oxidation method and suitable for low concentration and gas-liquid immiscible. The gas-phase bioreactor comprises a reaction cavity (5) in communication with upper and lower parts, an upper top cover (2) and a lower bottom cover (9). The upper top cover is provided with a liquid inlet (8-1) at the top end, a cavity in communication with the reaction cavity in the middle part, a sprayer (1) in communication with the liquid inlet (8-1) arranged in the cavity, and a liquid outlet (13) arranged on the sprayer (1). An upper bearing plate (3-1) is arranged between the upper top cover and the reaction cavity, the upper bearing plate (3-1) is densely provided with through holes (17), and sponge strips (11) extending into the reaction cavity (5) are fixed on the upper bearing plate (3-1) through the through holes (17). The patent technology has the advantages that the strain is in the gas-phase reaction space, and the strain is more fully contacted with the insoluble gas methane. The influence of water force flushing on the strain adhesion in the solution is reduced.

Description

A gas-phase bioreactor suitable for biological oxidation methods Technical Field

[0001] This patent relates to the field of bioreactor technology, and in particular to a gas-phase bioreactor suitable for low concentrations and gas-liquid immiscibility, applicable to biological oxidation methods. Background Technology

[0002] Methane has a significant greenhouse effect; on a 100-year timescale, its global warming potential is approximately 25 times that of the same mass of carbon dioxide. This means that controlling atmospheric methane concentrations can mitigate global warming more quickly and significantly. Currently, common methods for treating low-concentration methane include physical purification, catalytic combustion, and biological oxidation. Among these, biological oxidation offers advantages over other methods, including milder reaction conditions, safety and ease of implementation, low cost, high removal rate, fewer byproducts, and environmental friendliness.

[0003] Biological oxidation methods for waste gas mainly include biotrickling filtration, biofiltration, and bioscrubbing. Among them, biotrickling filtration systems have advantages such as low operating costs, more complete gas reactions, and good waste gas treatment effects.

[0004] At present, there are many designs for waste gas bioreactors. Chinese patent application number 202221922755.3 discloses a bioreactor for treating organic waste gas. This reactor mainly addresses the cooling of high-temperature gas and the impact of smoke and dust on the microorganisms in the packing material, but neglects the core of the entire reactor, the long-term operational consideration of the packing material.

[0005] Chinese patent application number 202221236981.3 discloses a bioreactor waste gas treatment device. This device is less efficient at treating waste gases that are insoluble in liquids than in a pure gas-phase reactor. Summary of the Invention

[0006] To address the aforementioned shortcomings, this patent provides a gas-phase bioreactor suitable for biological oxidation methods, specifically addressing the following issues related to the treatment of water-insoluble waste gases:

[0007] To alleviate the problem of gas-liquid mass transfer of insoluble gases;

[0008] To alleviate the problem of uneven wetting of the carrier by the liquid

[0009] To alleviate the problem of microbial shedding caused by water scouring;

[0010] To mitigate the harmful effects of high-temperature gases on biological growth;

[0011] This alleviates the problem of insufficient gas reaction within the cavity.

[0012] This invention is achieved through the following measures:

[0013] This invention discloses a gas-phase bioreactor suitable for biological oxidation, comprising a reaction chamber with vertical communication, an upper top cover located above the reaction chamber, and a lower bottom cover located below the reaction chamber;

[0014] The reaction chamber is provided with an air inlet and an air outlet;

[0015] The top of the top cover is provided with a liquid inlet, and the middle is provided with a cavity communicating with the reaction chamber. Inside the cavity is a sprayer connected to the liquid inlet, and the sprayer is provided with a liquid outlet. An upper support plate is provided between the top cover and the reaction chamber. The upper support plate is densely covered with through holes, and a sponge strip extending into the reaction chamber is fixed to the upper support plate through the through holes.

[0016] The bottom cover has a liquid outlet at its bottom end and a cavity in the middle that communicates with the reaction chamber. A lower support plate with a liquid passage hole is provided between the bottom cover and the reaction chamber.

[0017] In order to ensure uniform spraying of the reaction liquid in the above-mentioned gas phase bioreactor, preferably: a sliding ball is provided on the top cover, and a smooth track matching the sliding ball is provided at the upper end of the sprayer, allowing the sprayer to rotate within the cavity of the top cover; multiple fan blades are also provided on the outer periphery of the sprayer; the sprayer is provided with an inner cavity that communicates with the liquid inlet, and multiple spray rods communicating with the spray chamber are provided on the inner cavity of the sprayer, with multiple spray outlets on the spray rods having adjustable angles.

[0018] In order to control the reaction temperature, the above-mentioned gas phase bioreactor preferably has the following features: a water bath chamber is provided on the outside of the reaction chamber; and a peristaltic pump is provided between the inlet and outlet.

[0019] In the aforementioned gas-phase bioreactor, to allow the reaction liquid to enter the sponge strip more evenly, preferably, the upper support plate is provided with a sponge connected to the sponge strip.

[0020] Preferably, in the above-mentioned gas phase bioreactor, the upper support plate is further provided with several water mist through holes.

[0021] In the aforementioned gas phase bioreactor, preferably, the thickness of the sponge strip is 2-10 mm, and the length is 80-95% of the height of the reaction chamber.

[0022] In the aforementioned gas-phase bioreactor, preferably, the sponge strips fill 40-75% of the entire reaction chamber.

[0023] Preferably, in the above-mentioned gas phase bioreactor, the reaction chamber has two air inlets located at the upper end of the reaction chamber, and two air outlets located at the lower end of the reaction chamber.

[0024] Preferably, in the above-mentioned gas phase bioreactor, the air inlet of the reaction chamber is connected to a low concentration of methane, the methane concentration being 1-30%; and the sponge and sponge strips are adsorbed with bacterial strains and nutrient solution that react with methane.

[0025] Preferably, in the above-mentioned gas phase bioreactor, the methane concentration is 5-15%.

[0026] Advantages of this patented technology

[0027] This patent modifies the mass transfer method of traditional bioreactors through reactor structural design:

[0028] By placing the strain in a gaseous reaction space, the strain can come into more thorough contact with the insoluble gaseous methane.

[0029] This reduces the impact of water scouring in the solution on bacterial adhesion.

[0030] This patent modifies the wetting method of the reactor through reactor design:

[0031] The liquid can be evenly sprayed onto the sponge carrier through the sprayer pipe.

[0032] The sprayed liquid cools the gas being treated, making it more suitable for biological growth.

[0033] The sprayer uses the kinetic energy of the sprayed liquid to drive the fan blades on the sprayer to rotate, thereby accelerating the turbulence of the gas inside the cavity and speeding up the biological chemical reaction. Attached Figure Description

[0034] Figure 1 is a schematic cross-sectional view of the gas phase bioreactor of the present invention.

[0035] Figure 2 is a partial view A of Figure 1.

[0036] Figure 3 is a partial view B of Figure 1.

[0037] Figure 4 is a partial view of Figure 1, C.

[0038] Figure 5 is a partial view of Figure 2, D.

[0039] Figure 6 is a schematic diagram of the upper bearing plate of the present invention.

[0040] Figure 7 shows the percentage of methane consumption in this invention.

[0041] (1) Sprayer; (2) Top cover; (3-1) Upper support plate; (3-2) Lower support plate; (4-1) Air inlet; (4-2) Air outlet; (5) Reaction chamber; (6-1) Water bath outlet; (6-2) Water bath inlet; (7-1), (7-2) Rubber gasket; (8-1) Liquid inlet; (8-2) Liquid outlet; (9) Bottom cover; (10) Water bath chamber; (11) Sponge strip; (12) Sprayer inner cavity; (13) Liquid outlet; (14) Fan blade; (15) Sliding ball; (16) Smooth track; (17) Through hole; (18) Water mist through hole. Detailed implementation method:

[0042] Example 1:

[0043] The present invention will now be described in detail with reference to the accompanying drawings.

[0044] As shown in Figure 1.

[0045] Top cover 2; sprayer 1; sponge 11; reaction chamber 5 and bottom cover 9.

[0046] The top cover 2 and the bottom cover 9 are each designed with two through holes—an inlet 8-1 and an outlet 8-2—for supplying gas or liquid for circulation. A peristaltic pump is installed between the inlet 8-1 and the outlet 8-2 for the circulation of gas or liquid.

[0047] A water bath chamber 10 is provided outside the reaction chamber. The water bath chamber has a water bath outlet 6-1 and a water bath inlet 6-2 for water bath insulation and to control the reaction temperature inside the reaction chamber.

[0048] The reaction chamber is designed with four air inlets 4-1 and air outlets 4-2 that connect to the inner cavity, for the entry and exit of reaction gases, making the entire reactor more versatile.

[0049] A sprayer 1 is installed inside the top cover, and the sprayer 1 has a sprayer cavity 13. By combining a fan and a dispersed water outlet, the kinetic energy of the sprayed liquid drives the fan blades to rotate under the liquid dispersion spraying front, thereby accelerating the circulation of the mixed gas within the cavity. As shown in Figure 2. Multiple fan blades 14 are also provided on the outer periphery of the sprayer; the sprayer has a sprayer cavity 12 connected to the liquid inlet 8-1, and multiple spray rods connected to the spray chamber are provided on the sprayer cavity, with multiple spray outlets 13 on the spray rods that can be adjusted in angle.

[0050] As shown in Figure 3, the top cover is fixed to the reaction chamber with screws and nuts, and a rubber gasket 7-1 is added between them to ensure the airtightness of the entire reactor. The upper support plate 3-1 is fitted and fixed to the recessed platform inside the top cover 2 by the extended boss.

[0051] As shown in Figure 4, the bottom cover and the middle cavity are fixed together with screws and nuts, and a rubber gasket 7-2 is added between them to ensure the airtightness of the entire reactor.

[0052] As shown in Figure 5, the rotary sprayer has a ring of sliding balls placed on a smooth track inside the upper cover cavity. The upper cover is provided with a sliding ball 15, and the upper end of the sprayer is provided with a smooth track that matches the sliding ball, allowing the sprayer to rotate within the cavity of the upper cover.

[0053] As shown in Figure 6, an upper support plate 3-1 is provided between the top cover and the reaction chamber. The upper support plate 3-1 has multiple strip-shaped through holes 17, through which a sponge strip 11 extending into the reaction chamber 5 is fixed. The sponge strip is 5mm thick and its length is 92% of the height of the reaction chamber. The upper support plate also has several water mist through holes 18.

[0054] The gas-phase bioreactor of this invention is used to treat low concentrations of methane gas. Specific reactor operating parameters are as follows:

[0055] Container volume: 2.5L

[0056] Gas peristaltic pump parameters: 20 rpm corresponds to a gas flow rate of 9 ml / min.

[0057] Liquid peristaltic pump parameters: 30 rpm corresponds to a liquid flow rate of 13.5 ml / min.

[0058] Water bath temperature: 30℃

[0059] The reactor designed in this patent first fixes the sponge carrier inside the cavity and then insulates the cavity with a 30°C water bath. Enrichment stage:

[0060] Liquid: A 1:1 mixture of microbial culture and nutrient solution is introduced into the cavity through the opening in the top cover. When the mixture in the cavity reaches a certain volume, the kinetic energy of the sprayed mixture will propel the cavity onto the sponge carrier. Liquid flowing out from the bottom cover is pumped back into the cavity through the top cover by a peristaltic pump, thus creating a circulation of the mixture within the cavity.

[0061] Gas: The mixed gas (methane: oxygen = 1:2 - the most suitable gas conditions for methanogenic bacteria) enters through one of the four through holes in the cavity, and the gas after the reaction is completed is collected from one of the holes at the bottom.

[0062] This stage lasts approximately seven days and involves the enrichment culture of the bacterial strain.

[0063] Purification phase:

[0064] Liquid: The mixed liquid continues to circulate during the enrichment process, and the nutrient solution is replenished every week.

[0065] Gas: Low-concentration methane gas (methane: air = 1:9 - simulating low-concentration methane gas) enters through one of the four through holes in the cavity, and the gas after the reaction is completed is collected from one of the holes in the bottom.

[0066] Gas phase composition analysis of the gas collected during the purification stage showed that the methane purification efficiency reached 100% for three consecutive days, and the methane consumption rate per unit carrier volume reached 0.24 mol / h.

Claims

1. A gas-phase bioreactor suitable for biological oxidation, characterized in that: The system includes a reaction chamber (5) with its upper and lower parts connected, an upper top cover (2) located above the reaction chamber (5), and a lower bottom cover (9) located below the reaction chamber (5). The reaction chamber (5) is provided with an air inlet (4-1) and an air outlet (4-2). The top of the upper top cover is provided with a liquid inlet (8-1), and a cavity communicating with the reaction chamber (5) is provided in the middle. A sprayer (1) communicating with the liquid inlet (8-1) is provided inside the cavity, and a spray outlet (13) is provided on the sprayer (1). An upper support plate (3-1) is provided between the upper top cover and the reaction chamber (5). The upper support plate (3-1) is densely covered with through holes (17), and a sponge strip (11) extending into the reaction chamber (5) is fixed to the upper support plate (3-1) through the through holes (17). The bottom of the lower bottom cover is provided with a liquid outlet (8-2), and a cavity communicating with the reaction chamber (5) is provided in the middle. A lower support plate (3-2) with liquid passage holes is provided between the bottom cover and the reaction chamber (5); a sliding ball (15) is provided on the top cover, and a smooth track matching the sliding ball is provided at the upper end of the sprayer so that the sprayer can rotate in the cavity of the top cover; multiple fan blades (14) are also provided on the outer periphery of the sprayer; the sprayer is provided with a sprayer inner cavity (12) connected to the liquid inlet (8-1), and multiple spray rods connected to the sprayer inner cavity are provided on the sprayer inner cavity, and multiple spray outlets (13) with adjustable angles are provided on the spray rods; a sponge connected to the sponge strip is provided on the upper support plate; a low concentration of methane is connected to the air inlet (4-1) of the reaction chamber (5), with a methane concentration of 1-30%; strains and nutrient solution that react with methane are adsorbed on the sponge and sponge strip; a number of water mist passage holes (18) are also provided on the upper support plate.

2. The gas-phase bioreactor according to claim 1, characterized in that: A water bath chamber (10) is provided on the outside of the reaction chamber (5); a peristaltic pump is provided between the liquid inlet (8-1) and the liquid outlet (8-2).

3. The gas-phase bioreactor according to claim 1, characterized in that: The thickness of the sponge strip is 2-10mm, and the length is 80-95% of the height of the reaction chamber (5).

4. The gas-phase bioreactor according to claim 3, characterized in that: The sponge strips fill 50-85% of the entire reaction chamber (5).

5. The gas-phase bioreactor according to claim 1, characterized in that: The reaction chamber (5) has two air inlets (4-1) located at the upper end of the reaction chamber (5) and two air outlets (4-2) located at the lower end of the reaction chamber (5).

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