Device for sewage treatment using ozone

Abstract

The present disclosure relates to the technical field of wastewater treatment, and provides a device for sewage treatment by using ozone, which comprises a gas-liquid mixing device, a sewage treatment device, an ozone decomposition device and a tail gas treatment device. The gas-liquid mixing device is connected with a pressurized ozone pipeline and a sewage pipeline, and is used for pre-mixing pressurized ozone flowing from the pressurized ozone pipeline and sewage flowing from the sewage pipeline; the sewage treatment device is connected with the bottom of the gas-liquid mixing device, and is used for fully reacting the pressurized ozone and the sewage; the ozone decomposition device is connected with the top of the sewage treatment device, and is used for decomposing the residual ozone after treating the sewage; and the tail gas treatment device is connected with the top of the sewage treatment device and the ozone decomposition device, and is used for treating the excess tail gas in the sewage treatment device and the ozone decomposition device. The device can expand the gas-liquid contact area, reduce the self-decomposition rate of ozone in the liquid phase, and improve the mass transfer efficiency of ozone.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of wastewater treatment, in particular to a device for sewage treatment by using ozone. BACKGROUND

[0002] Ozone is a substance with extremely strong oxidizing property, which can be effectively used for sewage treatment sterilization, disinfection, algae removal, decolorization, COD degradation, cyanide and ammonia nitrogen removal, etc. The ozone oxidation mechanism is divided into: direct reaction of molecular ozone with pollutants; the generated hydroxyl radicals have very strong oxidizing property. Since ozone has relatively low solubility in water, it is a difficult-to-dissolve gas. Ozone needs to diffuse from the gas phase to the gas-liquid interface before dissolving, and then diffuse to the inside of the liquid after dissolving. The mass transfer rate depends on: the physical properties of the gas-liquid phases; the concentration difference on both sides of the interface and the rate of ozone consumption by chemical reaction; the turbulence degree of the medium. In the ozone water treatment process, the amount of ozone transferred to the water determines the reaction effect, so improving the mass transfer rate of ozone is the key to the ozone oxidation unit.

[0003] Using ozone for advanced treatment of sewage is a relatively common technology, but the conventional ozone oxidation technology has problems of low oxidation rate and high cost. Through in-depth research, it is found that the contact between sewage and ozone is not sufficient by using the same flow, different flow, catalyst contact and other ways, which limits the mass transfer process of ozone in the sewage, thereby affecting the treatment effect of ozone on the sewage.

[0004] Therefore, there is an urgent need for a technical solution of a device for sewage treatment by using ozone to solve the above problems. SUMMARY

[0005] In order to solve one or more technical problems mentioned in the background art, the scheme of the present disclosure provides a device for sewage treatment by using ozone.

[0006] According to one aspect of the embodiments of the present disclosure, a device for sewage treatment by using ozone is provided, which comprises a gas-liquid mixing device, a sewage treatment device, an ozone decomposition device and a tail gas treatment device. The gas-liquid mixing device is connected with a pressurized ozone pipeline and a sewage pipeline, and is used for pre-mixing pressurized ozone flowing from the pressurized ozone pipeline and sewage flowing from the sewage pipeline; the sewage treatment device comprises a fluidized cylinder connected with the bottom of the gas-liquid mixing device, and is used for sufficient reaction of the pressurized ozone and the sewage; the ozone decomposition device is connected with the top of the sewage treatment device, and is used for decomposing residual ozone after sewage treatment; and the tail gas treatment device is connected with the top of the sewage treatment device and the ozone decomposition device, and is used for treating excess tail gas in the sewage treatment device and the ozone decomposition device.

[0007] In some embodiments, the gas-liquid mixing device comprises a tubular reactor, in which a staggered porous structure is arranged to enhance the contact between ozone and sewage.

[0008] In some embodiments, the gas-liquid mixing device further comprises an aeration disc arranged at the lower part of the fluidization cylinder for spraying the mixed liquid of pressurized ozone and sewage into the fluidization cylinder and forming a negative pressure at the bottom of the fluidization cylinder, and a liquid ring compressor connected to the pressurized ozone pipeline to compress ozone to be pressurized, wherein the pressure of ozone ranges from 0.15 to 0.3 MPa.

[0009] In some embodiments, the sewage treatment device comprises a fluidization cylinder, in which the diameter of the bottom part of the cylinder is greater than the diameter of the top part of the cylinder to form a Venturi effect.

[0010] In some embodiments, the fluidization cylinder comprises a gas distribution plate, which is multilayered and arranged in sequence inside the fluidization cylinder to cut ozone bubbles and increase the contact area between ozone and sewage, and is uniformly provided with round holes with a diameter ranging from 1.0 to 2.0 cm.

[0011] In some embodiments, the sewage treatment device further comprises a guiding device arranged at the upper part of the fluidization cylinder, wherein the pressurized ozone and sewage form an internal circulation under the joint action of the guiding device and the aeration disc.

[0012] In some embodiments, the sewage treatment device further comprises a first water outlet groove and a first vent valve. The first water outlet groove is arranged at the upper part of the guiding device for guiding the sewage treated by ozone to the ozone decomposition device, and the first vent valve is arranged at the bottom of the sewage treatment device to discharge excess sewage in the sewage treatment device.

[0013] In some embodiments, the sewage treatment device further comprises a first breathing valve and a wire mesh demister. The first breathing valve is arranged on the top wall of the sewage treatment device to form a micro-positive pressure in the interior of the sewage treatment device, and the wire mesh demister is arranged between the guiding device and the first water outlet groove to remove foam from the sewage flowing to the first water outlet groove.

[0014] In some embodiments, the ozone decomposition device comprises a second breathing valve arranged on the top wall of the ozone decomposition device to discharge excess tail gas in the ozone decomposition device.

[0015] In some embodiments, the ozone decomposition device further comprises a second water outlet tank and a second vent valve. The second water outlet tank is arranged at the upper part of the side wall of the ozone decomposition device, is communicated with the water outlet pipeline, and is used for discharging the sewage in the ozone decomposition device after standing; the second vent valve is arranged at the bottom of the ozone decomposition device, and is used for discharging the excess sewage in the ozone decomposition device.

[0016] In some embodiments, the tail gas treatment device comprises a tail gas reactor, which is communicated with the sewage treatment device and the ozone decomposition device through a tail gas treatment pipeline.

[0017] In some embodiments, the tail gas treatment device further comprises a tail gas concentration detection device arranged on the tail gas treatment pipeline, which is used for detecting the concentration of the tail gas flowing to the tail gas treatment device.

[0018] In some embodiments, the tail gas treatment device further comprises a defoaming cylinder arranged on the tail gas treatment pipeline close to the connection with the sewage treatment device, which is used for reducing the bubble size of the tail gas discharged from the sewage treatment device.

[0019] In some embodiments, the device for treating sewage by using ozone further comprises a liquid catalyst adding device, a booster pump, a flow meter, a cross-line water pipe and an adjusting valve. The liquid catalyst adding device is arranged on the sewage pipeline, and is used for adding liquid catalyst into the sewage pipeline; the booster pump is arranged on the sewage pipeline, and is used for increasing the flow rate of the sewage; the flow meter is arranged on the sewage pipeline between the booster pump and the sewage treatment device, and is used for measuring the amount of sewage flowing into the sewage treatment device; the cross-line water pipe is communicated with the water outlet pipeline and the sewage pipeline, wherein the communication position of the cross-line water pipe with the sewage pipeline is between the booster pump and the flow meter; and the adjusting valve is arranged on the cross-line water pipe.

[0020] The device for treating sewage by using ozone provided by the embodiments of the present disclosure can achieve the following technical effects:

[0021] In the present application, two-stage sewage and ozone mixing devices are arranged. In the first stage, a gas-liquid mixing device is arranged, and a plurality of micro-channel assemblies are arranged in the gas-liquid mixing device, which are in a porous structure. In the second stage, a fluidization cylinder is arranged in the sewage treatment device, and a gas distribution plate is arranged in the fluidization cylinder to achieve further dissolution of ozone into sewage by cutting bubbles. A guide device is arranged at the upper part of the fluidization cylinder, and an aeration disc is arranged at the lower part of the fluidization cylinder, which forms a negative pressure. Under the action of the overall structure, the sewage can achieve a circulation water volume of 10-15 times, so that the sewage and ozone repeatedly contact to enhance the oxidation effect.

[0022] The ozone used is first pressurized to provide sufficient gas pressure, and the diameter of the bottom of the fluidization cylinder is greater than the diameter of the top of the fluidization cylinder to form a Venturi effect, so that the pressurized ozone and the sewage are enhanced in mixing effect in the fluidization cylinder.

[0023] An ozone decomposition device is arranged at the rear end of the sewage treatment device to provide sufficient decomposition time for the residual ozone in the sewage, and since the half-life of ozone is about 30 min, the residence time of the ozone decomposition device is at least 30 min to fully decompose the ozone.

[0024] A cross-line water pipe is arranged in the process, and the incoming water can be partially treated according to the water quality requirements, and then mixed with the sewage that is not treated, as long as the mixed sewage can meet the effluent requirements; the treatment process route is relatively flexible.

[0025] The tail gas treatment device can effectively treat the ozone precipitated in the sewage treatment device and the ozone decomposition device. The ozone bubbles are reduced by the defoaming cylinder for the treatment of ozone. The tail gas concentration detection device detects the concentration of the gas to be treated in real time to provide a basis for subsequent treatment.

[0026] A gas distribution plate can be arranged in the fluidization cylinder, which functions to continuously cut the ozone bubbles, so that the ozone bubbles do not gather into large ozone bubbles as the position rises. This will increase the contact area between ozone and sewage, making the efficiency higher.

[0027] Through the treatment of the device, 30%-50% of ozone can be effectively saved, greatly saving the treatment cost. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will be readily understood through reading the detailed description of the exemplary embodiments of the present disclosure below, with reference to the accompanying drawings. In the drawings, several embodiments of the present disclosure are illustrated by way of example and not limitation, and the same or corresponding reference numbers refer to the same or corresponding parts, in which:

[0029] Figure 1 is a schematic view showing a device for sewage treatment using ozone according to one embodiment of the present disclosure;

[0030] Figure 2 is a schematic view showing a gas distribution plate according to one embodiment of the present disclosure.

[0031] LIST OF REFERENCE NUMERALS

[0032] 1, gas-liquid mixing device; 11, tubular reactor; 12, aeration disc;

[0033] 2, sewage treatment device; 21, fluidization cylinder; 211, gas distribution plate; 22, guide device; 23, first water outlet tank; 24, first vent valve; 25, first breather valve;

[0034] 3, ozone decomposition device; 31, second breather valve; 32, second water outlet tank; 33, second vent valve;

[0035] 4, tail gas treatment device; 41, tail gas reactor; 42, tail gas concentration detection device; 43, defoaming cylinder;

[0036] 5, booster pump;

[0037] 6, flow meter;

[0038] 7, cross-line water pipe;

[0039] 8, regulating valve;

[0040] 9, liquid catalyst dosing device;

[0041] 10, wire mesh demister. DETAILED DESCRIPTION

[0042] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0044] For ease of description, spatial relative terms such as "over", "above", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned at 90 degrees or in other orientations in other different ways, and the spatial relative descriptions used herein are interpreted accordingly.

[0045] Now, example embodiments according to the present disclosure will be described in greater detail by referring to the drawings. However, these example embodiments can be implemented in various different forms, and should not be construed as being limited only to the embodiments set forth herein. It should be understood that the embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art, and in the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same reference numerals are used throughout the drawings to designate the same elements, and thus a description thereof will be omitted.

[0046] Figure 1 is an exploded view showing an apparatus for sewage treatment using ozone according to one embodiment of the present disclosure;

[0047] Figure 2 is a schematic view showing a gas distribution plate according to one embodiment of the present disclosure.

[0048] As Figure 1 shown, the present disclosure embodiment provides an apparatus for sewage treatment using ozone, which includes a gas-liquid mixing apparatus 1, a sewage treatment apparatus 2, an ozone decomposition apparatus 3, and a tail gas treatment apparatus 4. The gas-liquid mixing apparatus 1 is connected to a pressurized ozone pipeline and a sewage pipeline, and is used to pre-mix pressurized ozone flowing in from the pressurized ozone pipeline and sewage flowing in from the sewage pipeline. The sewage treatment apparatus 2 includes a fluidized cylinder 21 connected to the bottom of the gas-liquid mixing apparatus 1, and is used to perform a sufficient reaction of the pressurized ozone and the sewage. The ozone decomposition apparatus 3 is connected to the top of the sewage treatment apparatus 2, and is used to decompose ozone remaining after the sewage is treated. The tail gas treatment apparatus 4 is connected to the top of the sewage treatment apparatus 2 and the ozone decomposition apparatus 3, and is used to treat excess tail gas in the sewage treatment apparatus 2 and the ozone decomposition apparatus 3.

[0049] According to the technical solution, ozone is pressurized and then delivered to the gas-liquid mixing apparatus 1 through a pressurized ozone pipeline. Sewage is delivered to the gas-liquid mixing apparatus 1 through a sewage pipeline. The pressurized ozone and the sewage are mixed before entering the sewage treatment apparatus 2 to increase the solubility of ozone in the sewage. The mixed solution of ozone and sewage enters the bottom of the sewage treatment apparatus 2, and is circulated multiple times to fully utilize ozone for sewage treatment. The mixed solution of treated sewage and ozone enters the top of the ozone decomposition apparatus 3. The ozone decomposition apparatus 3 is allowed to stand for a period of time, and the sewage is automatically overflowed after the ozone decomposition apparatus 3 is full, which not only temporarily stores the sewage but also fully decomposes the ozone therein. Excess ozone and other gases in the sewage treatment apparatus 2 and the ozone decomposition apparatus 3 are treated by the tail gas treatment apparatus 4. The apparatus for sewage treatment using ozone can expand the gas-liquid contact area, reduce the self-decomposition rate of ozone in the liquid phase, and improve the mass transfer efficiency of ozone under the condition of a certain temperature and pressure.

[0050] Preferably, in order to provide sufficient decomposition time for the remaining ozone in the wastewater, the ozone decomposition device 3 is designed to store a mixture of wastewater and ozone for at least 30 minutes, taking advantage of the ozone's half-life of about 30 minutes.

[0051] Preferably, since both untreated wastewater and ozone continuously enter the wastewater treatment device 2 from the bottom, a relatively constant concentration gradient between the liquid phase and the gas phase can be maintained. This concentration gradient provides a continuous source of power for ozone to enter the liquid phase from the gas phase.

[0052] like Figure 1 As shown, in a preferred embodiment, the gas-liquid mixing device 1 includes a tubular reactor 11, which has an interlaced porous structure to enhance the contact between ozone and wastewater.

[0053] According to this embodiment, the tubular reactor 11 has a porous structure with multiple rows and columns of alternating porous structures inside. In particular, the porous structure can be arranged in parallel or non-uniformly to increase the contact area between ozone and wastewater and to break the ozone into small bubbles that are more easily dissolved by the wastewater.

[0054] like Figure 1 As shown, in a preferred embodiment, the gas-liquid mixing device 1 further includes: an aeration disc 12 and a liquid ring compressor. The aeration disc 12 is disposed at the bottom of the fluidizing cylinder 21 of the wastewater treatment device 2, and is used to spray the mixture of pressurized ozone and wastewater into the fluidizing cylinder 21 of the wastewater treatment device 2 and to form a negative pressure at the bottom of the fluidizing cylinder 21 of the wastewater treatment device 2. The liquid ring compressor is connected to the pressurized ozone pipeline to compress ozone for pressurization, wherein the pressure range of ozone is 0.15-0.3 MPa.

[0055] According to this embodiment, the aeration disc 12 can increase the flow rate of the mixture of pressurized ozone and wastewater and create negative pressure at the nozzle. The area radiated by this negative pressure can generate suction on the mixture, thereby providing power for circulation. A liquid ring compressor is used to compress the generated ozone to a pressure of 0.15-0.3 MPa, ensuring sufficient pressure for the wastewater and ozone to enter the microchannels. The liquid ring compressor uses wastewater as a makeup liquid, ultimately forming an ozone mixture that enters the fluidizing cylinder from the aeration disc.

[0056] like Figure 1 As shown, in a preferred embodiment, the wastewater treatment device 2 includes a fluidizing cylinder 21 with a bottom diameter larger than a top diameter to create a Venturi effect.

[0057] According to this embodiment, the fluidizing cylinder 21 forms a Venturi effect, which further accelerates the flow rate of the mixture and thus enhances the mixing effect.

[0058] like Figures 1 to 2As shown, in a preferred embodiment, the fluidizing cylinder 21 includes a gas distribution plate 211, which is multi-layered and sequentially disposed inside the fluidizing cylinder 21 to cut ozone bubbles and increase the contact area between ozone and wastewater. The gas distribution plate 211 may be uniformly arranged with circular holes, the diameter of which ranges from 1.0 to 2.0 cm.

[0059] According to this embodiment, gas distribution plates 211 are spaced apart from top to bottom inside the fluidizing cylinder 21. At regular intervals, they break ozone bubbles into smaller bubbles, thereby increasing the solubility of ozone in wastewater. After premixing, the mixing effect is further enhanced by the gas distribution plates 211. Circular holes with a diameter of 1.0-2.0 cm are formed on the gas distribution plates 211 to effectively break the bubbles into soluble portions, resulting in good performance. This is not a limitation; as long as the holes are uniformly distributed, it is acceptable.

[0060] Preferably, the gas distribution plate 211 can be evenly distributed in the fluidizing cylinder 21 to uniformly cut the ozone bubbles.

[0061] like Figure 1 As shown, in a preferred embodiment, the wastewater treatment device 2 further includes a guiding device 22, which is disposed on the upper part of the fluidizing cylinder 21, wherein pressurized ozone and wastewater form an internal circulation under the combined action of the guiding device 22 and the aeration disc 12.

[0062] According to this embodiment, the guide device 22 is a downwardly recessed cover structure, which can change the direction of the mixture of sewage and pressurized ozone sprayed onto it and return it to the bottom of the sewage treatment device 2, thereby forming a circulating flow under the negative pressure at the aeration disc 12.

[0063] like Figure 1 As shown, in a preferred embodiment, the wastewater treatment device 2 further includes a first effluent tank 23 and a first vent valve 24. The first effluent tank 23 is disposed on the upper part of the guide device 22 and is used to guide the ozone-treated wastewater to the ozone decomposition device 3; the first vent valve 24 is disposed at the bottom of the wastewater treatment device 2 to discharge excess wastewater from the wastewater treatment device 2.

[0064] According to this embodiment, a first effluent tank 23 is provided at the top of the wastewater treatment device 2 to lead the mixture of wastewater and pressurized ozone after the circulating reaction to the ozone decomposition device 3. In addition, a first vent valve 24 is provided at the bottom of the wastewater treatment device 2 to handle emergency events. For example, when it is necessary to vent the wastewater from the wastewater treatment device 2, or in other situations requiring the venting or discharge of some wastewater.

[0065] like Figure 1As shown, in a preferred embodiment, the wastewater treatment device 2 further includes a first breather valve 25 and a wire mesh demister 10. The first breather valve 25 is disposed on the top wall of the wastewater treatment device 2 to create a slight positive pressure inside the wastewater treatment device 2. The wire mesh demister 10 is disposed between the guide device 22 and the first effluent tank 23 to remove foam from the wastewater flowing to the first effluent tank 23.

[0066] According to this embodiment, a first breather valve 25 is provided at the top of the sewage treatment device 2 to create a slight positive pressure inside the sewage treatment device 2. According to Henry's Law, this can effectively increase the solubility of ozone in water and effectively improve the utilization rate of ozone. When the sewage flows to the first effluent tank 23 to exit the sewage treatment device 2, the sewage will first flow through the wire mesh demister 10. The mesh of the wire mesh demister 10 can filter out the foam mixed in with the sewage.

[0067] Preferably, the wastewater treatment device 2 adopts a bottom-in, top-out water inlet and outlet method. Wastewater enters from the bottom of the wastewater treatment device 2. The inner diameter of the fluidizing cylinder 21 is larger than the top diameter of the fluidizing cylinder 21, thus creating a Venturi effect and enhancing the mixing effect. Ozone also enters the wastewater treatment device 2 from the bottom through the aeration disc 12. A negative pressure is created at the aeration disc 12, drawing wastewater into the wastewater treatment device 2. The ozone and wastewater mix rapidly, and the gas-water mixture flows upwards along the wall of the wastewater treatment device 2. A guiding device is installed at the top of the wastewater treatment device 2. 22 alters the flow trajectory of the gas-water mixture. Under the influence of the guide device 22 and the negative pressure formed at the bottom of the wastewater treatment device 2, the gas-water mixture forms a clockwise internal circulation. Through the design of the gas volume and the wastewater treatment device 2, the gas-water mixture can achieve a circulation volume of approximately tens of times the influent volume, greatly extending the water flow path and expanding the gas-liquid phase contact area. This continuously renews the gas-liquid film layer, increases the bubble travel, and improves the ozone transfer efficiency. Ultimately, this allows for better contact between ozone and pollutants in the wastewater, resulting in a better ozone treatment effect in the wastewater.

[0068] like Figure 1 As shown, in a preferred embodiment, the ozone decomposition device 3 includes a second breathing valve 31, which is disposed on the top wall of the ozone decomposition device 3 to discharge excess exhaust gas inside the ozone decomposition device 3.

[0069] According to this embodiment, the ozone decomposition device 3 is a step following the treatment by the wastewater treatment device 2. The wastewater treated by the wastewater treatment device 2 contains ozone, which needs to be decomposed in the ozone decomposition device 3. During the decomposition process, some ozone and other gases will be released, which needs to be transferred to the exhaust gas treatment device 4 for further treatment via the second breathing valve 31.

[0070] likeFigure 1 As shown in the preferred embodiment, the ozone decomposition device 3 further comprises a second water outlet tank 32 and a second emptying valve 33. The second water outlet tank 32 is arranged at the upper part of the side wall of the ozone decomposition device 3, and is connected to the water outlet pipeline, for discharging the sewage in the ozone decomposition device 3 after standing. The second emptying valve 33 is arranged at the bottom of the ozone decomposition device 3, for discharging the excess sewage and ozone mixture in the ozone decomposition device 3.

[0071] According to the embodiment, the sewage and ozone mixture continuously flowing into the ozone decomposition device 3 flows out of the second water outlet tank 32 when reaching the position of the second water outlet tank 32. The second emptying valve 33 plays an emergency role. When the ozone decomposition device 3 needs to be emptied or partially discharged, the second emptying valve 33 needs to be opened. The operation is simple and convenient. The liquid amount in the ozone decomposition device 3 can be adjusted in real time.

[0072] As shown in the preferred embodiment, the ozone decomposition device 3 further comprises a second water outlet tank 32 and a second emptying valve 33. The second water outlet tank 32 is arranged at the upper part of the side wall of the ozone decomposition device 3, and is connected to the water outlet pipeline, for discharging the sewage in the ozone decomposition device 3 after standing. The second emptying valve 33 is arranged at the bottom of the ozone decomposition device 3, for discharging the excess sewage and ozone mixture in the ozone decomposition device 3. Figure 1 According to the embodiment, the tail gas reactor 41 is a conventional treatment device. Its main function is to generate oxygen after ozone reaction.

[0073] As shown in the preferred embodiment, the ozone decomposition device 3 further comprises a second water outlet tank 32 and a second emptying valve 33. The second water outlet tank 32 is arranged at the upper part of the side wall of the ozone decomposition device 3, and is connected to the water outlet pipeline, for discharging the sewage in the ozone decomposition device 3 after standing. The second emptying valve 33 is arranged at the bottom of the ozone decomposition device 3, for discharging the excess sewage and ozone mixture in the ozone decomposition device 3.

[0074] Figure 1 According to the embodiment, the tail gas concentration detection device 42 mainly detects the concentration of ozone in this article to provide a basis for the subsequent ozone treatment in the tail gas reactor 41.

[0075] As shown in the preferred embodiment of the present disclosure, the tail gas treatment device 4 further comprises a defoaming cylinder 43 arranged on the gas treatment pipeline close to the connection of the sewage treatment device 2, for reducing the bubble size of the gas discharged from the ozone fluidized tower.

[0076] According to the embodiment, the defoaming cylinder 43 mainly reduces the large-sized bubbles in the gas discharged from the sewage treatment device 2 into small bubbles for easy subsequent processing work. The arrangement of the defoaming cylinder 43 can play a good bubble treatment role. Figure 1 As shown in the preferred embodiment of the present disclosure, the tail gas treatment device 4 further comprises a defoaming cylinder 43 arranged on the gas treatment pipeline close to the connection of the sewage treatment device 2, for reducing the bubble size of the gas discharged from the ozone fluidized tower.

[0077] As shown in the preferred embodiment of the present disclosure, the tail gas treatment device 4 further comprises a defoaming cylinder 43 arranged on the gas treatment pipeline close to the connection of the sewage treatment device 2, for reducing the bubble size of the gas discharged from the ozone fluidized tower.

[0078] Figure 1 ​​As shown, in one preferred embodiment of the present disclosure, the device for sewage treatment by using ozone further comprises a liquid catalyst adding device 9, a booster pump 5, a flow meter 6, a cross-line water pipe 7 and an adjusting valve 8; the liquid catalyst adding device 9 is arranged on the sewage pipeline and used for adding liquid catalyst into the sewage pipeline; the booster pump 5 is arranged on the sewage pipeline and used for increasing the flow rate of sewage; the flow meter 6 is arranged on the sewage pipeline between the booster pump 5 and the sewage treatment device 2 and used for measuring the amount of sewage flowing into the sewage treatment device 2; the cross-line water pipe 7 is connected with the water outlet pipeline and the sewage pipeline, and the connection position of the cross-line water pipe 7 with the sewage pipeline is between the booster pump 5 and the flow meter 6; and the adjusting valve 8 is arranged on the cross-line water pipe 7.

[0079] According to the present embodiment, the booster pump 5 is used for pumping untreated sewage through the sewage pipeline to the sewage treatment device 2. When the flow meter 6 shows that the amount of sewage entering the sewage treatment device 2 is too much, the adjusting valve 8 is opened to transport the excess sewage through the cross-line water pipe 7. The liquid catalyst adding device 9 is added on the sewage pipeline, and the liquid catalyst can be hydrogen peroxide. The purpose of adding hydrogen peroxide is to form catalytic ozone oxidation and ozone direct oxidation to form a synergistic removal of pollutants in sewage, and the treatment effect is much higher than that of general direct ozone oxidation.

[0080] In a specific embodiment, a concentrated water treatment project of a certain refining project, the project is a reconstruction project, and before the reconstruction, a traditional ozone treatment process is used; the water treatment capacity is 400 t / h, the COD of raw water is about 160 mg / L, and the COD index before entering the reverse osmosis membrane needs to be treated to below 40 mg / L; the specific water quality requirements before and after treatment are shown in the following table:

[0081]

[0082] The running data after the reconstruction are as follows:

[0083]

[0084] Compared with the previous process, the present process has the following advantages:

[0085] (1) After the device for sewage treatment by using ozone is used, the effluent can stably meet the requirement that the effluent COD is less than 40 mg / L.

[0086] (2) The ozone dosage is saved by 50% by using the present application, that is, the cost is saved by 50%.

[0087] (3) The ratio of ozone dosage to COD removal of the device for sewage treatment by using ozone is lower, and the utilization efficiency of ozone is higher.

[0088] The application is provided with two-stage sewage and ozone mixing device, the first stage passes through gas-liquid mixing device 1, the gas-liquid mixing device 1 is provided with a plurality of groups of microchannel assemblies, and the plurality of groups of microchannel assemblies are porous structures. The second stage is provided with fluidization cylinder 21 in the sewage treatment device 2, the fluidization cylinder 21 is provided with gas distribution plate 211, so that the ozone is further dissolved into the sewage by cutting bubbles. The upper part of the fluidization cylinder 21 is provided with guiding device 22, and the lower part of the fluidization cylinder 21 is provided with aeration disc 12, the aeration disc 12 forms negative pressure, and under the action of the whole structure, the sewage can reach 10-15 times of circulating water volume, so that the sewage and ozone repeatedly contact to enhance the oxidation effect.

[0089] The ozone used is first pressurized to provide sufficient gas pressure, the diameter of the bottom of the fluidization cylinder 21 is greater than the diameter of the top of the fluidization cylinder 21 to form a Venturi effect, so that the pressurized ozone and the sewage enhance the mixing effect in the fluidization cylinder 21.

[0090] The sewage treatment device 2 is provided with ozone decomposition device 3 at the rear end, so as to provide sufficient decomposition time for the residual ozone in the sewage, since the half-life of ozone is about 30 min, the residence time of the ozone decomposition device 3 is at least 30 min, so as to sufficiently decompose the ozone.

[0091] The process is provided with cross-line water pipe 7, according to the water quality requirements, the incoming water can be partially treated, and then mixed with the sewage which is not treated, as long as the sewage after mixing can meet the effluent requirements.

[0092] The tail gas treatment device 4 can effectively treat the ozone precipitated from the sewage treatment device 2 and the ozone decomposition device 3. The ozone bubbles are reduced by the defoaming cylinder 43, and the ozone is treated. The tail gas concentration detection device 42 detects the concentration of the gas to be treated in real time, so as to provide a basis for subsequent treatment.

[0093] The gas distribution plate 211 can be arranged in the fluidization cylinder 21, the function of the gas distribution plate 211 is to continuously cut the ozone bubbles, so that the ozone bubbles do not gather into large ozone bubbles with the position rising. In this way, the contact area between the ozone and the sewage is increased, so that the efficiency is higher.

[0094] Through the treatment of the device, the ozone can be effectively saved by 30%-50%, and the treatment cost is greatly saved.

[0095] It is to be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0096] It should be understood that all references herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, and the use of the expressions "in one embodiment" or "in an embodiment" in various places in the specification further illustrate that various features, structures, or characteristics described in connection with one embodiment can be combined with features, structures, or characteristics of other embodiments.

[0097] It should be noted that the terms "first", "second", and the like, herein do not necessarily have an ordinal meaning. Rather, these terms are used herein, inter alia, to distinguish the different single features being discussed. It should be understood that any two features during discussion can be combined in any suitable manner without departing from the scope of the application. Furthermore, eligibility for patents can arise on the basis of combinations of essential characteristics of the application and / or the above-mentioned steps / processes.

[0098] The specific embodiments described hereinabove have been shown by way of example, and any modifications of more or less than these specific embodiments should be within the scope of the disclosure. Although the disclosure has been illustrated and described with respect to one or more implementations, equivalent alterations and modifications will become apparent to others skilled in the art and can be made in designating the application without departing from the spirit and technical scope of the disclosure.

Claims

1. An apparatus for sewage treatment using ozone, characterized by comprising: The application relates to a sewage treatment device, which comprises the following parts: a gas-liquid mixing device, which is connected with a pressurized ozone pipeline and a sewage pipeline and is used for pre-mixing pressurized ozone flowing from the pressurized ozone pipeline and sewage flowing from the sewage pipeline; The sewage treatment device comprises a fluidization cylinder which is communicated with the bottom of the gas-liquid mixing device and is used for carrying out sufficient reaction of the pressurized ozone and the sewage, the diameter of the bottom of the fluidization cylinder is larger than the diameter of the top of the fluidization cylinder to form a Venturi effect, and the fluidization cylinder comprises: a gas distribution plate which is multilayered and is sequentially arranged in the inside of the fluidization cylinder to cut ozone bubbles and increase the contact area of the ozone and the sewage, and a plurality of circular holes are uniformly arranged on the gas distribution plate, the diameter of the circular holes ranges from 1.0 2.0 cm. an ozone decomposing device, which is connected with the top of the sewage treatment device and is used for decomposing residual ozone after sewage treatment; a tail gas treatment device, which is connected with the top of the sewage treatment device and the ozone decomposing device and is used for treating excessive tail gas in the sewage treatment device and the ozone decomposing device; the gas-liquid mixing device comprises a tubular reactor, in which a plurality of rows and columns of staggered porous structures are arranged to enhance the contact between ozone and sewage; the gas-liquid mixing device further comprises an aeration disc arranged at the bottom of the fluidization cylinder and used for spraying the mixed liquid of pressurized ozone and sewage into the fluidization cylinder and forming negative pressure at the bottom of the fluidization cylinder; A liquid ring compressor is connected to the booster ozone pipe to compress ozone for pressure boosting, wherein the pressure of ozone is in the range of 0.15 0.3 Mpa.

2. The apparatus for sewage treatment using ozone according to claim 1, wherein the sewage treatment device further comprises a guide device arranged at the upper part of the fluidization cylinder, wherein the pressurized ozone and the sewage form internal circulation under the joint action of the guide device and the aeration disc.

3. The apparatus for sewage treatment using ozone according to claim 2, wherein the sewage treatment device further comprises a first water outlet groove arranged at the upper part of the guide device and used for guiding the ozone-treated sewage to the ozone decomposing device; a first vent valve arranged at the bottom of the sewage treatment device and used for discharging excessive sewage in the sewage treatment device; a first breathing valve arranged on the top wall of the sewage treatment device and used for forming micro-positive pressure in the sewage treatment device; a wire mesh demister arranged between the guide device and the first water outlet groove and used for removing foam of the sewage flowing to the first water outlet groove.

4. The apparatus for sewage treatment using ozone according to claim 1, wherein the ozone decomposing device comprises a second breathing valve arranged on the top wall of the ozone decomposing device and used for discharging excessive tail gas in the ozone decomposing device; a second water outlet groove arranged at the upper part of the side wall of the ozone decomposing device and connected with a water outlet pipeline and used for discharging the sewage in the ozone decomposing device after standing in the ozone decomposing device; a second vent valve arranged at the bottom of the ozone decomposing device and used for discharging excessive sewage in the ozone decomposing device.

5. The apparatus for sewage treatment using ozone according to claim 1, wherein the tail gas treatment device comprises a tail gas reactor connected with the sewage treatment device and the ozone decomposing device through a tail gas treatment pipeline; a tail gas concentration detection device arranged on the tail gas treatment pipeline and used for detecting the concentration of the tail gas flowing to the tail gas treatment device; a defoaming cylinder arranged on the tail gas treatment pipeline close to the connection with the sewage treatment device and used for reducing the bubble size of the tail gas discharged from the sewage treatment device.

6. The apparatus for sewage treatment using ozone according to claim 4, wherein The application further relates to a liquid catalyst adding device arranged on the sewage pipeline and used for adding liquid catalyst into the sewage pipeline. ​ a booster pump disposed on the sewage pipe for boosting the flow rate of the sewage; a flow meter disposed on the sewage pipe between the booster pump and the sewage treatment device for metering the amount of sewage flowing into the sewage treatment device; a cross-line water pipe communicating the water outlet pipe and the sewage pipe, wherein the communication of the cross-line water pipe with the sewage pipe is located between the booster pump and the flow meter; a regulating valve disposed on the cross-line water pipe.

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