Sewage treatment device

Abstract

The utility model relates to the technical field of sewage treatment, and discloses a sewage treatment device which comprises a reactor, an overflow plate is arranged in the reactor, one end of the overflow plate is installed at the bottom of the reactor, and the other end of the overflow plate extends towards the top of the reactor. The reactor is divided into a first cavity and a second cavity through the overflow plate, and an electrode assembly is arranged in the first cavity; the ozone oxidation assembly comprises an ozone reaction tank, an ozone generator and a first jet device, a water inlet of the ozone reaction tank is communicated with the second cavity, a water outlet of the ozone reaction tank is communicated with the first cavity, and the inlet end and the outlet end of the first jet device are both communicated with the ozone reaction tank; and the ozone generator is communicated with the inlet end of the first jet device. According to the utility model, an electrode technology and a catalytic ozonation technology are coupled in the same sewage treatment device, so that efficient degradation treatment on pollutants is realized, and the utilization rate of ozone is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment device. Background Art

[0002] With the development of the pharmaceutical industry, large quantities of pharmaceutical wastewater are being discharged, carrying high concentrations of recalcitrant organic matter. These pollutants are characterized by complex composition, high biological toxicity, high chemical bond energy, long molecular chains, stable chemical structure, and difficulty in biodegradation. Currently, there are devices that use electrode technology and ozone oxidation technology to collaboratively treat pharmaceutical wastewater. While these devices can improve the degradation efficiency of organic matter to a certain extent, they still suffer from low ozone utilization.

[0003] Therefore, how to provide a sewage treatment device that improves ozone utilization efficiency is a problem that those skilled in the art urgently need to solve. Utility Model Content

[0004] In view of this, the utility model provides a sewage treatment device to solve the problem of low ozone utilization rate in existing devices that use electrode technology and ozone oxidation technology to jointly treat wastewater.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A sewage treatment device comprises a reactor and an ozone oxidation component;

[0007] The reactor is provided with an overflow plate, one end of which is mounted on the bottom of the reactor and the other end extends toward the top of the reactor. The reactor is divided into a first cavity and a second cavity by the overflow plate. The electrode assembly is provided inside the first cavity.

[0008] The ozone oxidation assembly includes an ozone reaction tank, an ozone generator and a first ejector. The water inlet of the ozone reaction tank is connected to the second cavity, and the water outlet is connected to the first cavity. The inlet and outlet ends of the first ejector are both connected to the ozone reaction tank, and the ozone generator is connected to the inlet end of the first ejector.

[0009] Preferably, a partition is provided inside the first cavity, and the partition is installed on the side wall of the first cavity, and the first cavity is divided from bottom to top into a conductive water distribution area and a reaction area by the partition;

[0010] The electrode assembly is installed inside the reaction zone, the water outlet of the ozone reaction tank is connected to the water distribution zone, and the water distribution zone can be connected to the sewage to be treated.

[0011] Preferably, the water distribution area and the reaction area are connected through a filter head, the filtering end of the filter head is arranged in the reaction area, and the water inlet end of the filter head passes through the partition and extends to the water distribution area.

[0012] Preferably, the electrode assembly includes a plurality of groups of electrode plates, each group of electrode plates includes a cathode plate and an anode plate, and the cathode plate and the anode plate are both fixed to the separator.

[0013] Preferably, the electrode assembly further includes a filling layer, which is provided between the cathode plate and the anode plate, and is filled with filling particles.

[0014] Preferably, a second ejector is further included, wherein the outlet end of the second ejector is connected to the water distribution area, and the inlet end of the second ejector can be connected to a water source and / or an air source.

[0015] Preferably, a booster pump is provided in the communication pipe between the ozone reaction tank and the inlet end of the first ejector.

[0016] Preferably, a booster pump is provided in the communication pipe between the ozone reaction tank and the first cavity.

[0017] Preferably, an exhaust zone is provided inside the reactor, and the exhaust zone is located at the top of the reaction zone.

[0018] Preferably, a backwash expansion zone is formed inside the reaction zone, and the backwash expansion zone is located between the filling layer and the exhaust zone.

[0019] Preferably, it further comprises a gas-water separator, which is communicated with the outlet end of the exhaust zone.

[0020] Preferably, it further comprises an exhaust gas treatment device, which is communicated with the outlet end of the gas-water separator.

[0021] The utility model provides a sewage treatment device, which has the following beneficial effects compared with the prior art:

[0022] The utility model improves the electrode technology and the ozone catalytic oxidation coupling technology, and forms an ozone oxidation component with an ozone reaction tank, an ozone generator and a first ejector. On the one hand, the water flow in the ozone reaction tank is supplied to the first ejector, and the water outlet of the first ejector is mixed with the ozone generated by the ozone generator and then enters the ozone reaction tank, thereby realizing the internal circulation of ozone, and improving the dissolution efficiency and reaction efficiency of ozone through jet aeration; on the other hand, the water flow in the ozone reaction tank is supplied to the first cavity of the reactor for reaction and then overflows to the second cavity, and flows back to the ozone reaction tank through the second cavity, thereby realizing the external circulation of ozone; through the internal and external circulations of ozone, the utilization rate of ozone and the degradation rate of pollutants are improved.

[0023] The utility model couples the electrode technology and the ozone catalytic oxidation technology in the same sewage treatment device. In addition to the degradation of pollutants by the electrode assembly and the ozone itself, the electric field generated by the electrode assembly can promote the ozone to produce OH to indirectly oxidize pollutants. At the same time, the ozone molecules gain electrons in the electrode assembly to produce ·O, ·O3 - Strong oxidizing intermediates such as chlorine and chlorine are used to oxidize pollutants and achieve efficient degradation of pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 It is a structural diagram of a sewage treatment device according to an embodiment of the present utility model.

[0026] In the figure:

[0027] 100-reactor, 110-water distribution area, 120-reaction area, 121-backwash expansion area, 130-second cavity, 140-exhaust area, 200-overflow plate, 310-ozone reaction tank, 320-ozone generator, 330-first ejector, 340-reflux pipe, 350-first booster pump, 360-second booster pump, 400-partition, 500-filter head, 610-electrode plate, 620-filling layer, 630-external power supply, 700-second ejector, 800-gas-water separator, 900-exhaust treatment device. DETAILED DESCRIPTION

[0028] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0032] like Figure 1 As shown, an embodiment of the present invention provides a sewage treatment device, including a reactor 100 and an ozone oxidation component. An electrode component is provided in the reactor 100, and sewage is treated by electrocatalytic coupling ozone catalytic technology to achieve efficient utilization of ozone and electrochemistry, wherein the sewage can be medical wastewater after secondary treatment.

[0033] In some embodiments of the present invention, an overflow plate 200 is provided inside the reactor 100, one end of the overflow plate 200 is installed at the bottom of the reactor 100, and the other end extends toward the top of the reactor 100. The reactor 100 is divided into a first cavity and a second cavity 130 by the overflow plate 200, and an electrode assembly is provided inside the first cavity.

[0034] The ozone oxidation assembly includes an ozone reaction tank 310, an ozone generator 320 and a first ejector 330. The water inlet of the ozone reaction tank 310 is connected to the second cavity 130, and the water outlet is connected to the first cavity. The inlet and outlet ends of the first ejector 330 are both connected to the ozone reaction tank 310, and the ozone generator 320 is connected to the inlet end of the first ejector 330.

[0035] It can be understood that the present invention improves the electrode technology and ozone catalytic oxidation coupling technology, and forms an ozone oxidation component with an ozone reaction tank 310, an ozone generator 320 and a first ejector 330. On the one hand, the water flow in the ozone reaction tank 310 is supplied to the first ejector 330, and the water outlet of the first ejector 330 is mixed with the ozone generated by the ozone generator 320 and then enters the ozone reaction tank 310, thereby realizing the internal circulation of ozone; on the other hand, the water flow in the ozone reaction tank 310 is supplied to the first cavity of the reactor 100 for reaction and then overflows into the second cavity 130, and flows back to the ozone reaction tank 310 through the second cavity 130, thereby realizing the external circulation of ozone; through the internal and external circulation of ozone, the utilization rate of ozone and the degradation rate of pollutants are improved.

[0036] It should be noted that since the overflow plate 200 functions as an overflow, that is, when the fluid level in the first chamber reaches a preset height, the fluid needs to be discharged into the second chamber 130 and then flow back into the ozone reaction tank 310. Therefore, the end of the overflow plate 200 near the top of the reactor 100 can have a gap with the top of the reactor 100, which not only allows the water in the first chamber to flow over the overflow plate 200 and enter the second chamber 130, but also reserves a certain area as the exhaust area 140; or the end of the overflow plate 200 near the top of the reactor 100 can be fixed to the top of the reactor 100. However, when this method is used, the overflow plate 200 needs to be provided with an overflow port to allow the water in the first chamber to pass through the overflow port and enter the second chamber 130, and the area above the overflow port serves as the exhaust area 140.

[0037] In some embodiments of the present invention, the outlet end of the first ejector 330 is connected to the ozone reaction tank 310 through a return pipe 340. One end of the return pipe 340 is connected to the outlet end of the first ejector 330, and the other end is connected to the ozone reaction tank 310. The connection between the return pipe 340 and the ozone reaction tank 310 is close to the bottom of the ozone reaction tank 310, and the water flow direction is the tangential direction of the tank wall of the ozone reaction tank 310. The connection is preferably a position near the bottom of the side wall of the ozone reaction tank 310, such as the bottom of the right wall. The specific position of the connection on the side wall can be adaptively adjusted according to the operation site.

[0038] It can be understood that the fluid entering the ozone reaction tank 310 from the first ejector 330 through the return pipe 340 is a mixed fluid of water and ozone. The connection is set at one end close to the bottom of the ozone reaction tank 310. When the fluid enters the ozone reaction tank 310, the mixture of water and ozone bubbles will spirally rise in the ozone reaction tank 310, increasing the mixing efficiency.

[0039] Optionally, a first booster pump 350 is provided in the communication pipe between the ozone reaction tank 310 and the inlet end of the first ejector 330 to allow the water in the ozone reaction tank 310 to smoothly enter the first ejector 330, thereby improving the recycling efficiency of ozone.

[0040] In some embodiments of the present invention, a partition 400 is provided inside the first cavity, and the partition 400 is installed on the side wall of the first cavity. The first cavity is divided from bottom to top into a conductive water distribution area 110 and a reaction area 120 through the partition 400. The electrode assembly is installed inside the reaction area 120. The water outlet of the ozone reaction tank 310 is connected to the water distribution area 110, and the water distribution area 110 can be connected to the sewage to be treated.

[0041] It should be noted that, in addition to treating sewage, the sewage treatment device may also involve a backwash process, and since the fluid during the backwash process (including air flushing, water flushing, and combined air and water flushing) also needs to pass through the water distribution area 110 before entering the reaction area 120, the aforementioned water distribution area 110 is actually used as a water and gas distribution area. Preferably, a second booster pump 360 is provided on the connecting pipe from the water outlet of the ozone reaction tank 310 to the water distribution area 110 to ensure that the water in the ozone reaction tank 310 flows smoothly into the water distribution area 110.

[0042] Optionally, the water distribution area 110 and the reaction area 120 are connected through the filter head 500 , the filtering end of the filter head 500 is arranged in the reaction area 120 , and the water inlet end of the filter head 500 passes through the partition 400 and extends to the water distribution area 110 .

[0043] As can be understood, the provision of the filter head 500 can prevent leakage, ensure the normal operation of the filter tank, and preliminarily filter the fluid in the water distribution area 110 before introducing it into the reaction area 120 for pollutant degradation. The filter head 500 is preferably a long-handled filter head, which can achieve more uniform air and water distribution.

[0044] Optionally, the electrode assembly includes multiple groups of electrode plates 610, such as one group, two groups or three groups, etc. Each group of electrode plates 610 includes a cathode plate and an anode plate, and the cathode plate and the anode plate are fixed to the partition 400. The fixing method can be fixed by a card slot, wherein the card slot material is a non-conductive material, such as UPVC material, to improve the stability of the electrode plate 610.

[0045] As will be appreciated, both the cathode plate and the anode plate are connected to the external power supply 630 via wires disposed within the wire conduit. The cathode plate is connected to the negative electrode of the external power supply 630. The cathode plate may be, for example, a graphite or stainless steel plate, which is inexpensive and readily available, thereby improving the economy and operability of the reactor 100. The anode plate is connected to the positive electrode of the external power supply 630. The anode plate may be, for example, a titanium-based lead dioxide electrode. The main competing side reaction in the electrocatalytic oxidation process is the evolution of oxygen at the anode. The titanium-based lead dioxide electrode has a high oxygen evolution potential and good stability, thereby reducing side reactions during the electrocatalytic oxidation process.

[0046] Optionally, the electrode assembly further includes a filling layer 620, which is disposed between the cathode plate and the anode plate and is filled with filling particles, wherein the filling particles may be granular activated carbon and ozone catalytic fillers to improve the adsorption capacity and catalytic efficiency of the electrode assembly.

[0047] It can be understood that the ozone catalytic filler has a catalytic effect on ozone oxidation on the one hand, and is mixed with granular activated carbon on the other hand to prevent the three-dimensional electrode current from short-circuiting. Granular activated carbon has a good adsorption capacity for organic matter in medical wastewater. After electrochemical action and ozone oxidation, it can realize in-situ activation and regeneration of the three-dimensional electrode, ensuring the long-term reuse performance of the electrode. The granular activated carbon is repolarized under the action of the electric field to form countless tiny electrode units, which can simultaneously degrade pollutants.

[0048] In addition, the cathode plate, anode plate and filling particles form a three-dimensional electrode, coupling the three-dimensional electrode technology and ozone catalytic oxidation technology in the same device, realizing the mutual promotion of the two advanced oxidation technologies. In addition to the degradation ability of three-dimensional electrochemistry and ozone itself on pollutants, the electric field promotes ozone to produce ·OH to indirectly oxidize pollutants, and ozone molecules gain electrons at the cathode to produce ·O and ·O3 - and other strong oxidizing intermediates to oxidize pollutants.

[0049] In some embodiments of the present invention, the sewage treatment device also includes a second ejector 700, the outlet end of the second ejector 700 is connected to the water distribution area 110, and the inlet end of the second ejector 700 can conduct water source and / or air source, and the backwash process of the first cavity can be realized through the second ejector 700.

[0050] Optionally, the reactor 100 is provided with an exhaust zone 140 located at the top of the reaction zone 120 . A backwash expansion zone 121 is formed inside the reaction zone 120 and is located between the packing layer 620 and the exhaust zone 140 .

[0051] It should be noted that in actual operation, the height of the reactor 100 is generally 4-6m, the height of the backwash expansion zone 121 is generally 0.5-1m, and the height of the exhaust zone 140 is generally 0.6-0.8m, but there is no special limitation on this and it can be adjusted appropriately according to actual conditions.

[0052] Optionally, a gas-water separator 800 is further included, and the gas-water separator 800 is communicated with the outlet end of the exhaust area 140 .

[0053] Optionally, a tail gas treatment device 900 is further included, and the tail gas treatment device 900 is communicated with the outlet end of the gas-water separator 800 .

[0054] It can be understood that by reserving a backwash expansion area 121 between the packing layer 620 and the exhaust area 140, the loss of packing particles in the packing layer can be prevented; in addition, after the sewage is treated by the reactor 100, the unreacted ozone gas and the gas generated by the electrochemical process enter the exhaust gas treatment device 900 through the gas-water separator 800, and are then discharged after being diluted at high altitude.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A sewage treatment device, characterized in that: include: A reactor, wherein an overflow plate is provided inside the reactor, one end of the overflow plate is installed at the bottom of the reactor, and the other end extends toward the top of the reactor, and the reactor is divided into a first cavity and a second cavity by the overflow plate, and an electrode assembly is provided inside the first cavity; The ozone oxidation component includes an ozone reaction tank, an ozone generator and a first ejector. The water inlet of the ozone reaction tank is connected to the second cavity, and the water outlet is connected to the first cavity. The inlet and outlet ends of the first ejector are both connected to the ozone reaction tank, and the ozone generator is connected to the inlet end of the first ejector.

2. The sewage treatment device according to claim 1, characterized in that: A partition is provided inside the first cavity, and the partition is installed on the side wall of the first cavity, and the first cavity is divided from bottom to top into a conductive water distribution area and a reaction area by the partition; The electrode assembly is installed inside the reaction zone, the water outlet of the ozone reaction tank is connected to the water distribution zone, and the water distribution zone can be connected to the sewage to be treated.

3. The sewage treatment device according to claim 2, characterized in that: The water distribution area and the reaction area are connected through a filter head. The filtering end of the filter head is arranged in the reaction area. The water inlet end of the filter head passes through the partition and extends to the water distribution area.

4. The sewage treatment device according to claim 2, characterized in that: The electrode assembly includes a plurality of groups of electrode plates, each group of electrode plates includes a cathode plate and an anode plate, and the cathode plate and the anode plate are both fixed to the separator.

5. The sewage treatment device according to claim 4, characterized in that: The electrode assembly further includes a filling layer, which is disposed between the cathode plate and the anode plate and is filled with filling particles.

6. The sewage treatment device according to claim 2, characterized in that: It also includes a second ejector, the outlet end of the second ejector is connected to the water distribution area, and the inlet end of the second ejector can be connected to a water source and / or an air source.

7. The sewage treatment device according to any one of claims 1 to 6, characterized in that: The communicating pipe between the ozone reaction tank and the inlet end of the first ejector and the communicating pipe between the ozone reaction tank and the first cavity are both provided with a booster pump.

8. The sewage treatment device according to claim 5, characterized in that: The reactor is provided with an exhaust zone inside, and the exhaust zone is located at the top of the reaction zone; A backwash expansion zone is formed inside the reaction zone, and the backwash expansion zone is located between the filling layer and the exhaust zone.

9. The sewage treatment device according to claim 8, characterized in that: It also includes a gas-water separator, which is communicated with the outlet end of the exhaust zone.

10. The sewage treatment device according to claim 9, characterized in that: It also includes an exhaust gas treatment device, which is connected to the outlet end of the gas-water separator.

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