System for recycling ozone tail gas for biological filter aeration

Abstract

The utility model provides a system for recycling ozone tail gas for biological filter aeration, which comprises an ozone catalytic oxidation tower, an ozone tail gas destroying device, a biological filter, an aeration device and a fan, and the top of the ozone catalytic oxidation tower is communicated with the biological filter through a second water inlet pipeline; the top end of the catalytic ozonation tower is connected with the fan through a second gas pipeline, the ozone tail gas destroying device is arranged on the second gas pipeline, the fan is communicated with the aeration device through a third gas pipeline, and the aeration device is arranged in the biological filter. According to the utility model, the oxygen component decomposed by the ozone tail gas is recycled and supplied to microorganisms in the biological filter, so that the wastewater treatment process is optimized, and the treatment efficiency is improved at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, concretely relates to a kind of ozone tail gas recovery for biological filter aeration system. BACKGROUND

[0002] With the complexification of industrial wastewater composition and the continuous improvement of environmental discharge standards, wastewater advanced treatment technology faces severe challenges. Ozone catalytic oxidation technology is widely used in the field of degrading benzene series, antibiotics, dyes and other refractory organic matter due to its strong oxidation characteristics. The typical ozone catalytic oxidation tower generates high-concentration ozone through an ozone generator, which cooperates with the catalyst to generate hydroxyl radicals, which can decompose macromolecular organic matter into small molecular substances or directly mineralize, significantly improving the biodegradability of wastewater.

[0003] However, during the operation of the ozone catalytic oxidation tower, a certain amount of residual ozone is still contained in the tail gas discharged from the reaction tower after catalytic oxidation. If these low-concentration ozone tail gas is directly discharged without treatment, it not only causes irritating gas pollution, but also leads to a large waste of oxygen resources. The existing ozone tail gas treatment mostly uses high-temperature pyrolysis or single catalyst decomposition method, which has problems such as high energy consumption and easy deactivation of catalyst, and the treated oxygen is directly exhausted without resource utilization.

[0004] On the other hand, as a deep treatment unit, the biological filter uses microorganisms in the biofilm to adsorb and degrade pollutants in wastewater, thereby achieving purification of wastewater, and its treatment efficiency is highly dependent on the supply capacity of the aeration system. Traditional biological filter aeration devices mostly use external air or oxygen supply, such as using a Roots blower to supply external air or liquid oxygen tank pure oxygen aeration, which makes the energy consumption ratio relatively high, and uneven gas distribution leads to local DO concentration fluctuation in the filter material layer, causing biological membrane stratification and shedding. More importantly, the oxygen resources lost in the ozone oxidation stage and the oxygen supply demand in the biological treatment stage form a resource mismatch, making the overall process energy efficiency ratio low. Therefore, it is urgent to develop an integrated device that safely eliminates ozone toxicity while efficiently recovering oxygen gas, the product of ozone tail gas decomposition, to match the oxygen demand of the biological filter through accurate gas source control, achieving double improvement of environmental and economic benefits. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of ozone tail gas recovery for biological filter aeration system, by recycling the oxygen component decomposed from ozone tail gas, to supply microorganisms in the biological filter, optimize the wastewater treatment process, and at the same time improve the treatment efficiency. In addition, it also effectively reduces the emission of ozone tail gas, reduces its secondary pollution to the environment, and improves the resource utilization efficiency and environmental benefits of the wastewater treatment system.

[0006] To achieve the above purpose, the utility model proposes the following technical scheme:

[0007] An ozone tail gas recovery system for use in a biological filter aeration system includes an ozone catalytic oxidation tower, an ozone tail gas destruction device, a biological filter, an aeration device, and a blower. The top of the ozone catalytic oxidation tower is connected to the biological filter via a second inlet pipe, and the top of the ozone catalytic oxidation tower is connected to the blower via a second gas supply pipe. The ozone tail gas destruction device is installed on the second gas supply pipe, and the blower is connected to the aeration device via a third gas supply pipe. The aeration device is installed in the biological filter.

[0008] As a preferred technical solution of this utility model, the ozone exhaust gas destruction device includes a first decomposition unit and a second decomposition unit. The first decomposition unit includes a fixed frame and a composite filler. The fixed frame has a cylindrical structure, including an outer side wall and an inner side wall. The outer side wall of the fixed frame is a closed structure, with an air inlet and an air outlet connected to the second gas transmission pipeline on only opposite sides. The inner side wall of the fixed frame has a screen structure. The composite filler fills the sandwich formed by the outer side wall and the inner side wall of the fixed frame.

[0009] The second decomposition unit is disposed in the accommodating cavity formed by the inner sidewall of the fixed frame.

[0010] As a preferred embodiment of this invention, the composite filler comprises an adsorbent and a catalyst, wherein the ratio of the adsorbent to the catalyst is 1:2.

[0011] As a preferred embodiment of the present invention, the second decomposition unit is an ultraviolet light generating device and is disposed at the axial center of the accommodating cavity.

[0012] As a preferred technical solution of this utility model, the aeration device includes a first aeration pipe, a second aeration pipe and a third aeration pipe connected together, wherein the first aeration pipe is connected to the air outlet of the third air supply pipe, and the first aeration pipe, the second aeration pipe and the third aeration pipe are all provided with uniformly distributed aeration holes.

[0013] As a preferred technical solution of this utility model, the first aeration pipe and the third aeration pipe are respectively arranged in the upper and lower parts of the biological filter, and the second aeration pipe is connected between the first aeration pipe and the third aeration pipe, so that the three form an "I" shaped structure.

[0014] As a preferred embodiment of this utility model, the cross-sectional width of the first aeration pipe, the second aeration pipe and the third aeration pipe is 50-100mm, the diameter of the aeration holes is 1-3mm, and the hole spacing is 10-20mm.

[0015] As a preferred technical scheme of the utility model, the first aeration pipe, the second aeration pipe and the third aeration pipe all adopt 304 stainless steel pipelines.

[0016] As a preferred technical scheme of the utility model, the bottom of the ozone catalytic oxidation tower is connected with the ozone generator through the first gas conveying pipeline.

[0017] As a preferred technical scheme of the utility model, the top end of the biological filter tank is provided with a sealing cover.

[0018] From the above technical scheme, the technical scheme of the utility model provides a system for recycling ozone tail gas for a biological filter tank,

[0019] (1) the ozone tail gas is fully decomposed to produce oxygen under the combined action of activated carbon, manganese dioxide and ultraviolet lamp through the ozone destruction device, and the part of oxygen is fully utilized, reducing the influence of direct discharge of ozone tail gas on the environment.

[0020] (2) the oxygen produced by decomposing the ozone tail gas is recycled and used in the aeration system of the biological filter tank, avoiding the need for external oxygen or air, reducing the energy consumption of the system, improving the utilization efficiency of resources, and having good economic benefits in long-term operation.

[0021] (3) the trace amount of ozone in the ozone tail gas is directly introduced into the biological filter tank, which not only can improve the concentration of dissolved oxygen, improve the microbial environment and optimize the wastewater treatment process, but also can reduce the emission of ozone tail gas and reduce the secondary pollution to the environment.

[0022] (4) the ozone tail gas produced by the ozone catalytic oxidation tower is combined with the aeration system of the biological filter tank, breaking through the technical problems of fragmentation of the treatment unit and broken cycle of resources in the prior art, achieving double improvement of environmental benefits and economic benefits.

[0023] It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be seen as part of the utility model subject matter of the present disclosure, as long as such concepts are not mutually contradictory.

[0024] The foregoing and other aspects, embodiments and features of the present teachings can be better understood and appreciated from the following description of the embodiments of the present teachings taken together with the accompanying drawings. Other features of the present teachings, such as exemplary embodiments thereof, will be apparent from the description herein, or can be learned by practice of the present teachings as set forth hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are not drawn to scale. In the drawings, like reference numerals can be used to denote like parts throughout the various figures. For the purposes of clarity, not every component can be called out in every drawing. Embodiments of various aspects of the disclosure will now be described, by way of example only, with reference to the drawings in which:

[0026] Figure 1 A structural schematic diagram of an embodiment of the present application.

[0027] The meanings of the accompanying drawings are as follows:

[0028] 1 - ozone generator 2 - first gas conveying pipeline 3 - first water inlet pipeline 4 - ozone catalytic oxidation tower 5 - second gas conveying pipeline 6 - second water inlet pipeline 7 - ozone tail gas destruction device 8 - composite filler 9 - ultraviolet light generating device 10 - fan 11 - third gas conveying pipeline 12 - aeration device 13 - aeration hole 14 - biological filter 15 - water outlet pipeline DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the usual meanings understood by those of ordinary skill in the art to which the present application belongs.

[0030] The "first", "second" and similar words used in the patent application description and claims of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular form "one", "an" or "the" and the like do not represent a quantity limitation, but represent the existence of at least one. The words "include" or "contain" and the like mean that the elements or objects appearing before "include" or "contain" cover the features, whole, steps, operations, elements and / or components listed after "include" or "contain", and do not exclude the existence or addition of one or more other features, whole, steps, operations, elements, components and / or their collections. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, which can change accordingly when the absolute position of the described object changes.

[0031] In order to realize the safe elimination of ozone toxicity and the efficient recovery of the ozone tail gas product-oxygen, break the technical problems of the fragmentation of the treatment unit and the broken resource cycle in the prior art, and achieve the double promotion of environmental benefits and economic benefits, an ozone tail gas recovery device for a biological filter aeration system is provided in the embodiments of the present application.

[0032] The system comprises an ozone catalytic oxidation tower 4, an ozone tail gas destruction device 7, a biological filter 14, an aeration device 12 and a fan 10. The bottom of the ozone catalytic oxidation tower 4 is respectively communicated with a first water inlet pipeline 3 and a first gas inlet pipeline 2, the first water inlet pipeline 3 is used for introducing sewage into the ozone catalytic oxidation tower 4, and the other end of the first gas inlet pipeline 2 is communicated with an ozone generator 1 and used for introducing ozone into the ozone catalytic oxidation tower 4. The top of the ozone catalytic oxidation tower 4 is also respectively communicated with a second water inlet pipeline 6 and a second gas inlet pipeline 5, wherein the second water inlet pipeline 5 is communicated with the water inlet of the biological filter 14, the other end of the second gas inlet pipeline 5 is communicated with the fan 10, the gas outlet end of the fan 10 is communicated with the aeration device 12 arranged in the biological filter 14 through a third gas inlet pipeline 11, and the oxygen obtained by the decomposition of the ozone tail gas is sucked into the biological filter 14 by the fan 10 for aeration. The bottom of the biological filter 14 is provided with a water outlet pipeline 15, and the wastewater is discharged to the next wastewater treatment unit through the water outlet pipeline 15.

[0033] In the embodiments of the present application, the ozone tail gas destruction device 7 is arranged on the second gas inlet pipeline 5, the ozone tail gas discharged from the top end of the ozone catalytic oxidation tower 4 is decomposed by the ozone tail gas destruction device 7, then the oxygen generated by the decomposition is sucked by the fan 10, mixed with air and then punched into the aeration device 12 through the third gas inlet pipeline 11, and the concentration of the oxygen is controlled by adjusting the air inlet amount, so that the concentration of the dissolved oxygen in the biological filter 14 reaches the optimum.

[0034] In the embodiments of the present application, the ozone tail gas destruction device 7 has multiple ozone tail gas decomposition and destruction functions. Specifically, the ozone tail gas destruction device 7 comprises a first decomposition unit and a second decomposition unit, the first decomposition unit comprises a fixed frame and a composite filler 8, the fixed frame is in a cylindrical structure and comprises an outer side wall and an inner side wall, and the inside of the fixed frame is also hollow to form a containing cavity. The outer side wall of the fixed frame is a closed structure, and only an air inlet and an air outlet communicated with the second gas inlet pipeline 5 are respectively arranged on the opposite two sides, so as to avoid the gas from escaping, the inner side wall of the fixed frame is a screen structure, the composite filler 8 is filled in the interlayer formed by the outer side wall and the inner side wall of the fixed frame, the ozone tail gas adsorbed and catalytically decomposed by the composite filler 8 enters the containing cavity through the screen hole, and is decomposed again by the second decomposition unit.

[0035] In a preferred embodiment of this invention, the composite packing 8 is a mixed packing material composed of an adsorbent and a catalyst mixed in a certain ratio, such as 1:2, for example, a mixed packing material of activated carbon and manganese dioxide. Activated carbon adsorbs ozone and other byproducts, while manganese dioxide catalyzes the decomposition of ozone. The combination of these two materials decomposes ozone into oxygen. Secondary ozone decomposition can be achieved through photolysis. The second decomposition unit can be configured as an ultraviolet light generator 9, such as an ultraviolet lamp, positioned at the axial center of the accommodating cavity to further decompose undecomposed ozone tail gas escaping from the sieve holes, producing oxygen.

[0036] An aeration device 12 is installed in the biological filter to uniformly supply oxygen to the biological filter 14. In a preferred embodiment of this invention, the aeration device 12 includes a first aeration pipe, a second aeration pipe, and a third aeration pipe connected together. The first aeration pipe is connected to the outlet of the third air supply pipe. The first, second, and third aeration pipes are all provided with uniformly distributed aeration holes 13. Furthermore, the first and third aeration pipes are respectively located at the upper and lower parts of the biological filter 14, and the second aeration pipe connects the first and third aeration pipes, forming an "I"-shaped structure. This ensures sufficient aeration in the upper, middle, and lower regions of the biological filter 14, resulting in a uniform distribution of dissolved oxygen and facilitating efficient decomposition by microorganisms. The cross-sectional width of the first, second, and third aeration pipes is 50-100 mm, the diameter of the aeration holes 13 is 1-3 mm, and the hole spacing is 10-20 mm. All three aeration pipes are made of 304 stainless steel, which has advantages such as strong corrosion resistance, high temperature resistance, and high compressive strength.

[0037] To prevent external debris from entering the biological filter 14, a sealing cover is installed at the top of the biological filter 14 to ensure the activity and filtration effect of the biofilm in the tank, reduce the emission of wastewater odors in the tank, and avoid environmental pollution.

[0038] The working principle of this utility model embodiment is roughly as follows:

[0039] The sewage enters the ozone catalytic oxidation tower 4 through the first water inlet pipeline 3, and ozone is generated by the ozone generator 1 and enters the ozone catalytic oxidation tower 4 through the first gas conveying pipeline 2, the wastewater is catalytically oxidized by ozone in the ozone catalytic oxidation tower 4, and enters the biological filter tank 14 through the second water inlet pipeline 6, the ozone tail gas after reaction in the tower enters the ozone destruction device 7 through the second gas conveying pipeline 5, the ozone tail gas is adsorbed by activated carbon in the ozone destruction device 7, and is decomposed to generate oxygen under the catalysis of manganese dioxide, and after entering the containing cavity, is further decomposed to generate oxygen under the photolysis of the ultraviolet lamp; the oxygen generated by the decomposition of the ozone tail gas is pumped to the fan 10, and at the same time, the fan 10 also extracts external air and mixes the oxygen in a certain proportion, then enters the aeration device 12 through the third gas conveying pipeline 11, and is discharged from the aeration hole 13 of the aeration device 12 and uniformly distributed in the biological filter tank 14, so as to provide the microorganisms in the biological filter tank 14 with the best concentration of dissolved oxygen, and finally, the wastewater after the metabolic action of the microorganisms is discharged to the next wastewater treatment unit through the water outlet pipeline 15.

[0040] Although the utility model has disclosed as above with preferable embodiments, it is not used to limit the utility model. Those skilled in the art of the utility model can make various changes and decorations without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model is defined by the claims.

Claims

1. A method of recovering ozone tail gas for use in a biological filter aeration system, characterized by, The system includes an ozone catalytic oxidation tower (4), an ozone tail gas destruction device (7), a biological filter (14), an aeration device (12), and a blower (10). The top of the ozone catalytic oxidation tower (4) is connected to the biological filter (14) through a second water inlet pipe (6). The top of the ozone catalytic oxidation tower (4) is connected to the blower (10) through a second gas supply pipe (5). The ozone tail gas destruction device (7) is installed on the second gas supply pipe (5). The blower (10) is connected to the aeration device (12) through a third gas supply pipe (11). The aeration device (12) is installed in the biological filter (14).

2. The ozone tail gas recovery for biofilter aeration system according to claim 1, wherein, The ozone exhaust gas destruction device (7) includes a first decomposition unit and a second decomposition unit. The first decomposition unit includes a fixed frame and a composite filler (8). The fixed frame has a cylindrical structure and includes an outer side wall and an inner side wall. The outer side wall of the fixed frame is a closed structure, with an air inlet and an air outlet connected to the second gas transmission pipeline on opposite sides. The inner side wall of the fixed frame is a screen structure. The composite filler (8) fills the sandwich formed by the outer side wall and the inner side wall of the fixed frame. The second decomposition unit is disposed in the accommodating cavity formed by the inner sidewall of the fixed frame.

3. The ozone tail gas recovery for biofilter aeration system according to claim 2, wherein, The second decomposition unit is an ultraviolet light generating device (9), and is located at the axial center of the accommodating cavity.

4. The ozone tail gas recovery for biofilter aeration system according to claim 1, wherein, The aeration device (12) includes a first aeration pipe, a second aeration pipe and a third aeration pipe connected together. The first aeration pipe is connected to the air outlet of the third air supply pipe (11). The first aeration pipe, the second aeration pipe and the third aeration pipe are all provided with uniformly distributed aeration holes (13).

5. The ozone tail gas recovery for biofilter aeration system according to claim 4, wherein, The first aeration pipe and the third aeration pipe are respectively located at the upper and lower parts of the biological filter, and the second aeration pipe is connected between the first aeration pipe and the third aeration pipe, so that the three form an "I" shaped structure.

6. The ozone tail gas recovery for biofilter aeration system according to claim 4, wherein, The cross-sectional width of the first aeration pipe, the second aeration pipe and the third aeration pipe is 50-100mm, the diameter of the aeration holes is 1-3mm, and the hole spacing is 10-20mm.

7. The ozone tail gas recovery for biofilter aeration system according to claim 4, wherein, The first aeration pipe, the second aeration pipe, and the third aeration pipe are all made of 304 stainless steel.

8. The ozone tail gas recovery for biofilter aeration system of claim 1, wherein, The bottom of the ozone catalytic oxidation tower (4) is connected to the ozone generator (1) through the first gas pipeline (2).

9. The ozone tail gas recovery for biofilter aeration system according to claim 1, wherein, The top of the biological filter (14) is equipped with a sealing cap.

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