Biological membrane reaction device for industrial wastewater treatment

Abstract

A biofilm reaction device for industrial wastewater treatment comprises at least one biofilm reactor, each biofilm reactor comprises a main body framework, and each main body framework comprises an inner cylinder and an outer cylinder which are coaxially arranged; the inner cylinder and the outer cylinder are both hollow cylinders, a plurality of first holes are evenly formed in the surface of the inner cylinder, and a plurality of second holes are evenly formed in the surface of the outer cylinder. The upper plate is assembled at the upper end of the main body framework; the lower plate is assembled at the lower end of the main body framework; a microbial carrier area is formed among the inner cylinder, the outer cylinder, the upper plate and the lower plate; and a slow-release glucose feeding area is formed among the inner cylinder, the upper plate and the lower plate. The biological membrane reaction device for industrial wastewater treatment, disclosed by the utility model, is reasonable in structural design, and realizes synchronous reaction of anoxic, aerobic and anaerobic conditions and efficient treatment of industrial wastewater through modular, multi-level and porous design and optimization of microbial distribution and environmental conditions of a biological membrane.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment equipment, in particular to a biofilm reaction device for industrial wastewater treatment. Background Art

[0002] Biofilm Reactor is a wastewater treatment technology that utilizes the biofilm formed by microorganisms on the solid surface. It can be used to treat high-concentration organic wastewater and difficult-to-degrade pollutants.

[0003] At present, the existing biofilm reactors have the following deficiencies and disadvantages:

[0004] 1. Pollution and blockage: Due to the presence of sludge, microorganisms and organic matter in the wastewater, the permeability of the biofilm will gradually decrease during use. This is the main disadvantage of the current bioreactor. The membrane needs to be cleaned regularly and the cleaning frequency is high.

[0005] 2. Packing blockage: The surface of the packing is easily blocked by biofilm and solid matter, resulting in poor water flow and reduced treatment efficiency. Therefore, it is necessary to control the thickness of the biofilm by frequently cleaning and replacing the packing.

[0006] 3. High initial investment and operating costs: The construction cost and operation and maintenance cost of the biofilm reactor are high, including the cost and replacement cost of the membrane components.

[0007] 4. Biofilm shedding and stability: Biofilm may fall off due to shear force or other external forces in the water flow, affecting the treatment stability and effect.

[0008] 5. Fluctuation of treatment efficiency: When traditional biofilm reactors process load changes or toxic pollutants, the treatment efficiency may fluctuate, affecting the effluent quality. In addition, the growth of ordinary biofilms on the carrier may be uneven, resulting in uneven mass transfer efficiency and degradation effect in the reactor.

[0009] Therefore, it is necessary to develop a new type of biofilm reaction device to solve the above technical problems, which has broad application prospects in the field of industrial wastewater treatment. Utility Model Content

[0010] Purpose of the utility model: In order to overcome the above-mentioned deficiencies, the purpose of the utility model is to provide a biofilm reaction device for industrial wastewater treatment, which has a reasonable structural design and optimizes the microbial distribution and environmental conditions of the biofilm through modular, multi-level and porous design, and realizes the synchronous reaction of anoxic, aerobic and anaerobic. It can be flexibly combined and expanded, and is easy to clean, maintain and replace. It has good adaptability to fluctuations in water quality and water quantity, and the treatment process is more stable, thereby realizing efficient treatment of industrial wastewater and having broad application prospects.

[0011] Technical solution: A biofilm reaction device for industrial wastewater treatment, comprising at least one biofilm reactor, wherein the biofilm reactor comprises:

[0012] A main body frame, the main body frame comprises an inner tube and an outer tube arranged coaxially; the inner tube and the outer tube are both hollow cylinders, a plurality of holes 1 are evenly opened on the surface of the inner tube, and a plurality of holes 2 are evenly opened on the surface of the outer tube;

[0013] An upper plate, the upper end of the main frame is equipped with an upper plate;

[0014] A lower plate, the lower end of the main frame is equipped with a lower plate;

[0015] Among them, a microbial carrier area is formed between the inner cylinder, the outer cylinder, the upper plate and the lower plate, and a number of gel carriers are built in the microbial carrier area; a slow-release glucose feeding area is formed between the inner cylinder, the upper plate and the lower plate, and a number of slow-release glucose are built in the slow-release glucose feeding area.

[0016] The biofilm reaction device described in the utility model is composed of one or more biofilm reactors, and adopts a modular combination design, which can be flexibly combined and expanded according to the industrial wastewater treatment volume. Moreover, when the industrial wastewater treatment volume changes, there is no need to replace the entire biofilm reactor, and only the biofilm reactor needs to be adjusted according to the incremental value or decrement value of the treatment volume.

[0017] The biofilm reactor has a reasonable structural design. Through reasonable stratification (microbial carrier area, slow-release glucose feeding area) and porous design, it can more efficiently supply nutrients to microorganisms, optimize the microbial distribution and environmental conditions of the biofilm, achieve efficient removal of ammonia nitrogen, and has good adaptability to fluctuations in water quality and water quantity, making the treatment process more stable.

[0018] The utility model uses gel as a microbial carrier, forms a layer of microbial film on the surface of the polymer gel, and utilizes the metabolic process of these microorganisms to degrade organic pollutants and other harmful substances in industrial wastewater. Due to the special structure and properties of the polymer gel, it can create the required growth environment for different microorganisms, and utilize the diffusion (transfer) restriction of oxygen to form a dissolved oxygen gradient in the microbial flocs, thereby achieving the aggregation of anoxic, aerobic and anaerobic reactions in one system. Its mechanism of action is to consume alkalinity through the nitrification process and generate alkalinity through the denitrification process, without the need for acid-base neutralization, thereby effectively maintaining the pH value stable and forming a microenvironment that is conducive to achieving simultaneous nitrification and denitrification. In addition, as a microbial carrier, the polymer gel can expand the surface area ratio of the biofilm, thereby enhancing the adhesion of the biofilm and reducing the clogging problem.

[0019] Furthermore, in the above-mentioned biofilm reaction device for industrial wastewater treatment, the area on the upper plate surface corresponding to the microbial carrier area is provided with at least one row of holes three arranged in a circular array, and the area on the lower plate surface corresponding to the microbial carrier area is also provided with at least one row of holes four arranged in a circular array.

[0020] Preferably, the area on the upper plate surface corresponding to the microbial carrier area is provided with three rows of holes arranged in a circular array, and the area on the lower plate surface corresponding to the microbial carrier area is also provided with three rows of holes arranged in a circular array.

[0021] Furthermore, in the above-mentioned biofilm reaction device for industrial wastewater treatment, the shapes of hole one, hole two, hole three and hole four include but are not limited to regular hexagon, regular octagon, rectangle, circle and ellipse.

[0022] Preferably, the shapes of hole one, hole two, hole three and hole four are regular hexagons.

[0023] Furthermore, in the above-mentioned biofilm reaction device for industrial wastewater treatment, the aperture of hole one is smaller than the aperture of hole two.

[0024] Preferably, the hole one, hole three and hole four have the same aperture.

[0025] Furthermore, in the above-mentioned biofilm reaction device for industrial wastewater treatment, the pore size of hole one is smaller than that of slow-release glucose, and the pore size of hole two is smaller than that of the gel carrier.

[0026] Furthermore, in the above-mentioned biofilm reaction device for industrial wastewater treatment, the biofilm reactor is immersed in and fixed in a water pool.

[0027] When used, the biofilm reactor is immersed and fixed in a water pool, the industrial wastewater is fully in contact with the suspended gel carrier, and the pollutants in the industrial wastewater are degraded by the biofilm attached to the surface of the gel carrier.

[0028] Furthermore, the above-mentioned biofilm reaction device for industrial wastewater treatment includes an aeration device, wherein the aeration device is arranged on one side outside the biofilm reactor and fixed in a water pool.

[0029] Providing oxygen through aeration devices can promote the metabolism of aerobic microorganisms.

[0030] Furthermore, the above-mentioned biofilm reaction device for industrial wastewater treatment includes a stirring device, wherein the stirring device is arranged on one side outside the biofilm reactor and is also fixed in the water pool.

[0031] Preferably, the stirring device is fixed at the center of the pool. The biofilm reactor is combined with mechanical stirring and / or aeration to make the gel carrier evenly distributed and move in the biofilm reactor, thereby increasing the contact area between the industrial wastewater and the biofilm.

[0032] The beneficial effects of the utility model are as follows: the biofilm reaction device for industrial wastewater treatment described in the utility model is reasonably designed, combining biofilm technology with traditional nitrification and denitrification processes, and is intended to efficiently remove pollutants such as ammonia nitrogen, total nitrogen and total phosphorus in wastewater; through reasonable stratification and porous design, the microbial distribution and environmental conditions of the biofilm are optimized, and efficient removal of ammonia nitrogen is achieved, with a denitrification efficiency of more than 90%, and good adaptability to fluctuations in water quality and water volume, and a more stable treatment process; compared with the traditional activated sludge method, the biofilm technology produces less sludge, reducing the cost of sludge treatment and disposal; the biofilm reactor does not require frequent stirring and aeration, has low energy consumption, and helps to reduce operating costs; a modular combination design is adopted, which can be flexibly combined and expanded according to the amount of industrial wastewater treatment, and is easy to clean, maintain and replace; using gel as a microbial carrier, anaerobic, anoxic and aerobic reactions in biochemical reactions can be simultaneously realized, and the surface area ratio of the biofilm is also expanded, thereby enhancing the adhesion of the biofilm and reducing clogging problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of a biofilm reactor of the biofilm reaction device for industrial wastewater treatment according to the utility model;

[0034] Figure 2 This is a front view of the biofilm reactor of the biofilm reaction device for industrial wastewater treatment according to the utility model;

[0035] Figure 3 A top view of a biofilm reactor of the biofilm reaction device for industrial wastewater treatment according to the utility model;

[0036] Figure 4 A bottom view of the biofilm reactor of the biofilm reaction device for industrial wastewater treatment according to the utility model;

[0037] Figure 5 This is a schematic cross-sectional view of the biofilm reactor AA of the biofilm reaction device for industrial wastewater treatment according to the utility model;

[0038] Figure 6 This is a diagram of the mechanism of denitrification and dephosphorization of a gel carrier in the biofilm reaction device for industrial wastewater treatment described in the utility model;

[0039] Figure 7A schematic cross-sectional view of a biofilm reactor of the biofilm reaction device for industrial wastewater treatment according to the utility model;

[0040] In the figure: main frame 1, inner cylinder 11, hole one 111, outer cylinder 12, hole two 121, upper plate 2, hole three 21, lower plate 3, hole four 31, microbial carrier area 4, slow-release glucose feeding area 5, gel carrier 6, anaerobic area a, facultative anaerobic area b, aerobic area c, hydration layer d. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1 , 2 , 3, 4, 5, 6, 7 and Example 1, Example 2, Example 3 further illustrate the utility model.

[0042] Example 1

[0043] The biofilm reaction device for industrial wastewater treatment of the utility model includes at least one biofilm reactor, and the number of biofilm reactors can be flexibly designed according to the industrial wastewater treatment volume. Moreover, when the industrial wastewater treatment volume changes, it is not necessary to replace the entire biofilm reactor, but only to adjust the biofilm reactor according to the incremental value or decrement value of the treatment volume.

[0044] like Figure 1 , 2 As shown in Figures 3, 4, 5 and 7, the biofilm reactor includes a main frame 1, an upper plate 2 and a lower plate 3. The upper plate 2 and the lower plate 3 are respectively mounted on the upper end and the lower end of the main frame 1.

[0045] Furthermore, the main frame 1 includes an inner tube 11 and an outer tube 12 which are coaxially arranged. The inner tube 11 and the outer tube 12 are both in the shape of hollow cylinders, and a plurality of holes 111 are evenly opened on the surface of the inner tube 11, and a plurality of holes 21 are evenly opened on the surface of the outer tube 12. A microbial carrier area 4 is formed between the inner tube 11, the outer tube 12, the upper plate 2 and the lower plate 3, and a plurality of gel carriers 6 are built into the microbial carrier area 4, and holes 3 21 arranged in a circumferential array are opened in the area corresponding to the microbial carrier area 4 on the surface of the upper plate 2; a slow-release glucose feeding area 5 is formed between the inner tube 11, the upper plate 2 and the lower plate 3, and a plurality of slow-release glucose are built into the slow-release glucose feeding area 5, and holes 4 31 arranged in a circumferential array are also opened in the area corresponding to the microbial carrier area 4 on the surface of the lower plate 3.

[0046] From the above, it can be seen that the biofilm reactor of the utility model is reasonably layered, namely, a microbial carrier area 4 and a slow-release glucose feeding area 5, a plurality of gel carriers 6 are built in the microbial carrier area 4, a plurality of slow-release glucoses are built in the slow-release glucose feeding area 5, and a porous design of hole one 111, hole two 121, hole three 21, and hole four 31 is adopted. The above design can more efficiently supply nutrients to the microorganisms, and at the same time optimizes the microbial distribution and environmental conditions of the biofilm, and realizes the efficient removal of ammonia nitrogen. The denitrification efficiency is as high as more than 90%, and it has good adaptability to fluctuations in water quality and water quantity, and the treatment process is more stable.

[0047] Furthermore, the utility model uses gel as a microbial carrier, forms a layer of microbial film on the surface of the polymer gel, and utilizes the metabolic process of these microorganisms to degrade organic pollutants and other harmful substances in industrial wastewater.

[0048] Among them, the polymer gel adopts the existing technology, and the technicians in this field can choose according to the needs, such as sodium alginate, sodium alginate-activated carbon, sodium alginate-polyvinyl alcohol, sodium alginate-acrylamide immobilized gel balls, etc. Taking sodium alginate gel balls as gel carrier 6 as an example, the water content of sodium alginate gel balls is more than 80%, the density is close to that of water, polymer chains are distributed on the surface and inside, and a network structure is formed; it contains a large number of hydroxyl groups and has good hydrophilicity, so microorganisms can attach to the polymer molecular chains; the three-dimensional spatial network structure provides a good channel for material transfer and exchange; the hydraulic resistance in the biofilm reactor is small, and it can be suspended in water under the action of aeration; bacteria can enter the micropores and attach to the chain structure and be fixed inside the carrier; microorganisms can gather and reproduce in large numbers on the surface and inside of the gel and maintain good activity. The microorganisms fixed by the carrier have a strong ability to degrade pollutants. They can not only treat monomer pollutants, but also degrade macromolecular side chains, and can also change some functional groups to decompose macromolecular pollutants into oligomers or other small molecular organic matter; when removing pollutants, not only can the degradation effect of the fixed microorganisms be utilized, but the gel carrier 6 itself can also adsorb heavy metals, organic matter, nitrogen and phosphorus in sewage.

[0049] Furthermore, the denitrification and phosphorus removal mechanism of the gel carrier 6 is as follows Figure 6As shown, when applied, industrial wastewater is fully in contact with the suspended gel carrier 6, a water film (hydration layer d) will be formed on the surface of the gel carrier 6 and a large number of microorganisms will be attached, which will gradually diffuse from the outer surface of the gel carrier 6 to the inside of the gel carrier 6 through the pore channel. During the mass transfer process, the oxygen concentration gradually decreases, and three areas are formed inside the gel carrier 6: anaerobic area a, facultative anaerobic area b and aerobic area c. Nitrification reaction mainly occurs in the aerobic area c, where ammonia oxidizing bacteria and nitrite oxidizing bacteria convert ammonia nitrogen into nitrate nitrogen and nitrite nitrogen. Ammonia nitrogen in areas with higher oxygen concentration can be directly converted into nitrogen gas. Denitrification reaction mainly occurs in the facultative anaerobic area b and the anaerobic area c. Denitrifying bacteria oxidize organic matter to obtain energy for their own growth and reproduction, and convert the generated nitrate nitrogen and nitrite nitrogen into nitrogen gas. The gel carrier 6 can play a good role in fixing denitrifying bacteria during the wastewater denitrification process, and a complete microscopic denitrification reaction process can be carried out inside a single gel carrier 6. In addition, the gel carrier 6 itself also has adsorption capacity, and can adsorb organic matter and ammonia nitrogen in the wastewater inside the gel carrier 6 body for denitrifying bacteria to carry out denitrification reaction. When nutrients are insufficient, storage denitrification can be carried out.

[0050] As can be seen from the above, the biofilm reactor of the utility model can form a multi-stage reaction (simultaneously realizing anaerobic, anoxic and aerobic reactions in biochemical reactions in one reaction), and degrade organic pollutants step by step through multi-stage treatment, thereby reducing the pollution load in a single-stage state.

[0051] The working process of the biofilm reaction device for industrial wastewater treatment is as follows:

[0052] 1. Immerse and fix at least one biofilm reactor in a water pool;

[0053] 2. The industrial wastewater in the pool is fully in contact with the gel carrier 6 suspended in the biofilm reactor, and the pollutants in the industrial wastewater are degraded by the biofilm attached to the surface of the gel carrier;

[0054] 3. Pay attention to regular cleaning to ensure the biochemical efficiency of the biofilm reaction device.

[0055] Example 2

[0056] Based on the structural basis of Example 1 above, Figure 1 , 2 , 3, 4, 5, and 7 as shown.

[0057] In the biofilm reaction device for industrial wastewater treatment described in the utility model, the shapes of the holes 1, 2, 3 and 4 are regular hexagons. The aperture of the hole 111 is smaller than the aperture of the hole 2 121, the aperture of the hole 111 is smaller than the slow-release glucose, the aperture of the hole 2 121 is smaller than the gel carrier 6, and the apertures of the holes 1, 3 and 4 are the same.

[0058] Example 3

[0059] Based on the structural basis of Example 1 or Example 2, Figure 1 , 2 , 3, 4, 5, and 7 as shown.

[0060] The biofilm reaction device for industrial wastewater treatment described in the utility model also includes an aeration device (not shown), which is also fixed in the water pool and located on one side outside the biofilm reactor.

[0061] The biofilm reaction device for industrial wastewater treatment described in the utility model also includes a stirring device (not shown), which is fixed in the center of the water pool and located on one side outside the biofilm reactor.

[0062] The working process of the biofilm reaction device for industrial wastewater treatment is as follows:

[0063] 1. Immerse and fix at least one biofilm reactor in a water pool;

[0064] 2. The industrial wastewater in the pool is fully in contact with the gel carrier 6 suspended in the biofilm reactor, and the pollutants in the industrial wastewater are degraded by the biofilm attached to the surface of the gel carrier;

[0065] 3. Providing oxygen through the aeration device can promote the metabolism of aerobic microorganisms; at the same time, mechanical stirring is used to make the gel carrier 6 evenly distributed and move in the biofilm reactor, thereby increasing the contact area between the wastewater and the biofilm;

[0066] 4. Pay attention to regular cleaning to ensure the biochemical efficiency of the biofilm reaction device.

[0067] As can be seen from the above, the biofilm reaction device described in the utility model combines biofilm technology with traditional nitrification and denitrification processes, aiming to efficiently remove pollutants such as ammonia nitrogen, total nitrogen and total phosphorus in wastewater. By controlling the microbial growth environment, the nitrification and denitrification microorganisms attached to the surface of the gel carrier are used to complete the oxidation of ammonia nitrogen, thereby realizing the treatment technology of converting ammonia nitrogen in wastewater into nitrogen gas and discharging total phosphorus through precipitation, and finally achieving the purpose of denitrification and dephosphorization, which has the following advantages:

[0068] (1) Efficient denitrification: By optimizing the microbial distribution and environmental conditions of the biofilm, efficient removal of ammonia nitrogen is achieved, with a denitrification efficiency of more than 90%;

[0069] (2) Stable operation: Through the porous and layered design, it has good adaptability to fluctuations in water quality and water volume, and the treatment process is more stable;

[0070] (3) Reduce sludge volume: Compared with the traditional activated sludge process, biofilm technology produces less sludge, reducing the cost of sludge treatment and disposal;

[0071] (4) Energy saving and environmental protection: The biofilm reactor does not require frequent stirring and aeration, has low energy consumption, and helps reduce operating costs;

[0072] (5) Strong adaptability: It is suitable for various types of wastewater treatment, including but not limited to urban sewage, industrial wastewater, especially wastewater with high nitrogen content.

[0073] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A biofilm reactor for industrial wastewater treatment, characterized in that: The method comprises at least one biofilm reactor, wherein the biofilm reactor comprises: A main body frame (1), the main body frame (1) comprising an inner cylinder (11) and an outer cylinder (12) which are coaxially arranged; the inner cylinder (11) and the outer cylinder (12) are both hollow cylindrical in shape; a plurality of first holes (111) are evenly formed on the surface of the inner cylinder (11); and a plurality of second holes (121) are evenly formed on the surface of the outer cylinder (12); An upper plate (2), the upper end of the main frame (1) being equipped with the upper plate (2); A lower plate (3), the lower end of the main frame (1) being equipped with the lower plate (3); A microbial carrier area (4) is formed between the inner cylinder (11), the outer cylinder (12), the upper plate (2) and the lower plate (3), and a plurality of gel carriers (6) are built into the microbial carrier area (4); a slow-release glucose feeding area (5) is formed between the inner cylinder (11), the upper plate (2) and the lower plate (3), and a plurality of slow-release glucose are built into the slow-release glucose feeding area (5).

2. The biofilm reaction device for industrial wastewater treatment according to claim 1, characterized in that: The area on the surface of the upper plate (2) corresponding to the microbial carrier area (4) is provided with at least one row of holes three (21) arranged in a circular array, and the area on the surface of the lower plate (3) corresponding to the microbial carrier area (4) is also provided with at least one row of holes four (31) arranged in a circular array.

3. The biofilm reaction device for industrial wastewater treatment according to claim 2, characterized in that: The shapes of the hole one (111), hole two (121), hole three (21), and hole four (31) include but are not limited to regular hexagon, regular octagon, rectangle, circle, and ellipse.

4. The biofilm reaction device for industrial wastewater treatment according to claim 1, characterized in that: The aperture of the first hole (111) is smaller than the aperture of the second hole (121).

5. The biofilm reaction device for industrial wastewater treatment according to claim 4, characterized in that: The pore size of the first hole (111) is smaller than that of the slow-release glucose, and the pore size of the second hole (121) is smaller than that of the gel carrier (6).

6. The biofilm reaction device for industrial wastewater treatment according to claim 1, characterized in that: The biofilm reactor is submerged and fixed in a water tank.

7. The biofilm reaction device for industrial wastewater treatment according to claim 6, characterized in that: Also includes: The aeration device is arranged on one side outside the biofilm reactor and fixed in the water pool.

8. The biofilm reaction device for industrial wastewater treatment according to claim 6 or 7, characterized in that: Also includes: The stirring device is arranged on one side outside the biofilm reactor and is also fixed in the water pool.

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