Water treatment device for ozone micro-nano bubble coupling electrochemical oxidation process

Abstract

The utility model discloses a water treatment device adopting an ozone micro-nano bubble coupling electrochemical oxidation process. The water treatment device comprises an ozone generating device, a micro-nano bubble generating device, a BDD (Boron Drain Discharge) electrode unit and an air flotation filter tank device, the device has the following beneficial effects: (1) the Venturi jet device is adopted to release ozone micro-nano bubbles, so that wastewater and the micro-nano bubbles are fully stirred and mixed and are fully contacted with the BDD electrode for oxidative degradation, and the impact force formed by jet flow can wash the BDD electrode plate, so that the BDD electrode plate is prevented from being easily blocked; (2) an ozone micro-nano bubble technology and a BDD electrode technology are coupled to generate a synergistic effect, a large number of hydroxyl radicals are generated, the oxidation capacity is enhanced, the organic matter removal capacity is improved, and the sterilization, decoloration and deodorization capacities of the device on raw water are enhanced. And (3) the BDD is combined with an air flotation process, so that the occupied area is reduced, and the layout is optimized. And (4) fine particles in the water body are further removed by the air floatation superposition filter tank, and the concentration of suspended particulate matters is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of high-concentration organic wastewater deep treatment devices, in particular to a water treatment device using an ozone micro-nano bubble coupled electrochemical oxidation process. Background Art

[0002] High-concentration organic wastewater is a technical challenge in the field of sewage treatment. High-concentration organic wastewater comes from industries such as food, petroleum, chemical, natural gas collection, medicine, pesticides, and breeding. It is characterized by dark color, unpleasant odor, complex composition, low biodegradability, and high COD. Wastewater from some industries is toxic.

[0003] High-concentration organic wastewater has complex components, and traditional single treatment technology can no longer meet the treatment needs of modern high-concentration organic wastewater. At present, advanced oxidation technology or advanced oxidation technology combined with other processes is more commonly used to treat high-concentration organic wastewater, which has the advantages of strong oxidation ability, high treatment efficiency, fast reaction speed, and easy control; however, these technologies have certain limitations: (1) The existing technology or process combination is cumbersome, the equipment occupies a large area, and the construction cost and operating cost are high; (2) The filler is easy to compact, the amount of reagents used is large, and the utilization rate is low; (3) The treatment effect on certain suspended solids and organic wastewater with high color and strong odor is not ideal. Therefore, an integrated deep treatment device for high-concentration organic wastewater is needed to further treat the wastewater so that the wastewater meets the discharge standards.

[0004] Ozone has a strong oxidizing capacity and is highly effective in decolorizing, deodorizing, and degrading organic matter in wastewater. Ozone-infused micro- and nano-bubble technology can enhance ozone's oxidative capacity. The hydroxyl radicals released when ozone micro- and nano-bubbles burst can oxidize and decompose organic pollutants, enhancing ozone's removal of recalcitrant organic matter. Ozone's strong oxidizing properties can also disinfect water. When micro- and nano-bubbles are used instead of traditional ozone, achieving the same inactivation rate of the target pathogen, E. coli, requires a lower ozone dosage. The ozone flotation process combines oxidation, decolorization, disinfection, and flotation separation within a single unit. Its short residence time and compact footprint improve treatment efficiency, making it suitable for advanced treatment of high-concentration organic wastewater. CN211497211U discloses a high-efficiency micro- and nano-ozone flotation device that utilizes a Venturi tube and an aeration release head to generate micro- and nano-bubbles, making it less susceptible to clogging. However, the system lacks integrated electro-oxidation technology, resulting in limited reductions in wastewater color and COD.

[0005] The BDD electrode electrolytic oxidation method is an efficient and green electrochemical oxidation method for electrolytic wastewater treatment. It is a highly promising technology for treating high-concentration / refractory organic wastewater and is suitable for use as a deep treatment technology. CN117964062A discloses a barrel-type electrochemical water treatment device, a water treatment system, and an operating method. It uses BDD (boron-doped diamond) electrodes to pre-treat refractory organic wastewater, improves biodegradability, and reduces the decolorization and deodorization of wastewater to a limited extent. Currently, the use of BDD electrodes in water treatment has the following problems: (1) The barrel type requires an external mixer to mix the wastewater to ensure full contact with the BDD electrode, which consumes a lot of energy. The gap between the BDD cathode and anode is easily clogged, causing the equipment to not operate normally. (2) The contact time between the wastewater and the electrode in the tank-type electrolytic wastewater treatment equipment is too short, resulting in limited treatment effect. Alternatively, if multiple electrolytic tanks are connected in series or in parallel, the treatment cost is high.

[0006] In summary, the existing technologies have the following technical problems: (1) The existing high-concentration organic wastewater treatment technology is not ideal for treating certain organic wastewaters with suspended solids, high chroma, and strong odor. (2) The BDD electrodes are easily clogged, the contact time between the wastewater and the electrodes is short, and the treatment effect is limited. Utility Model Content

[0007] (1) Technical problems solved

[0008] In view of the deficiencies of the prior art, the present invention provides a water treatment device that combines ozone micro-nano bubbles with an electrochemical oxidation process, which can solve at least one of the above-mentioned technical problems.

[0009] (2) Technical solution

[0010] In order to solve the above technical problems, the present invention provides the following technical solutions: a water treatment device of ozone micro-nano bubble coupled electrochemical oxidation process, comprising an ozone generator, a micro-nano bubble generator, a BDD electrode unit and a flotation filter device, the ozone generator comprising an ozone generator, the micro-nano bubble generator comprising a micro-nano bubble generator and a venturi ejector, the BDD electrode unit comprising a BDD electrode module, the flotation filter device comprising a flotation filter, a scraper and filter media, the flotation filter being divided into a contact zone and a separation filtration zone by a partition, the ozone generator being connected to the micro-nano bubble generator, the venturi ejector being arranged at the lower part of the contact zone, the BDD electrode module being arranged at the middle part of the contact zone, the water inlet of the micro-nano bubble generator being connected to the return water outlet of the clear water tank, the water outlet of the micro-nano bubble generator being connected to the venturi ejector, the scraper being arranged at the upper part of the separation filtration zone, and the filter media being arranged at the lower part of the separation filtration zone.

[0011] Preferably, the ozone generator further includes a circulating water cooling device, which is connected to the ozone generator through a cooling water inlet pipe and a cooling water outlet pipe; the ozone generator is specifically connected to the micro-nano bubble generator through an air guide hose, and the water outlet of the micro-nano bubble generator is specifically connected to the Venturi ejector through a connecting pipe, wherein the air guide hose is provided with an air volume regulating valve and the connecting pipe is provided with a check valve.

[0012] Preferably, the water treatment device of the ozone micro-nano bubble coupled electrochemical oxidation process further comprises a sewage pump, which is connected to the contact area via a sewage pipe, wherein the sewage pipe is provided with a flow regulating valve and a flow meter.

[0013] Preferably, the BDD electrode unit further includes a voltage-stabilized power supply, and the BDD electrode module is connected to the voltage-stabilized power supply.

[0014] Preferably, the contact zone is located on the left side of the flotation filter tank, and a slag discharge trough is provided on the upper right side of the separation and filtration zone.

[0015] Preferably, the flotation filter device also includes a backwash drain pipe, a filter plate and a water distribution filter beam arranged in the separation filtration area. A plurality of long-handled filter heads are evenly distributed on the surface of the filter plate. The backwash drain pipe is located above the filter material. The filter material is arranged on the filter plate. The filter plate is arranged on the water distribution filter beam. The backwash drain pipe is provided with a through hole connected to the separation filtration area. The backwash drain pipe is also provided with a control valve. A water hole is provided at the bottom of the water distribution filter beam. A water and air distribution groove is formed between the filter plate and the bottom of the separation filtration area.

[0016] Preferably, the water and air distribution trough is connected to the liquid level regulator inside the clear water tank through a connecting pipe.

[0017] Preferably, the flotation filter device further includes a blower and a backwash air inlet pipe, and the blower is connected to the water and air distribution tank through the backwash air inlet pipe.

[0018] Preferably, the water treatment device for the ozone micro-nano bubble coupled electrochemical oxidation process further includes a backwash water inlet pipe, which is connected to the connecting pipe.

[0019] Preferably, the backwash air inlet pipe, the connecting pipe, and the backwash water inlet pipe are all provided with control valves.

[0020] (3) Beneficial effects

[0021] Compared with the existing technology, the present invention provides a water treatment device that couples ozone micro-nano bubbles with electrochemical oxidation technology, which has the following beneficial effects: (1) The Venturi ejector is not easy to clog. The present invention uses a Venturi ejector to release ozone micro-nano bubbles, which can fully mix the wastewater and micro-nano bubbles and fully contact and oxidize and degrade with the BDD electrode. The impact force formed by the jet can flush the BDD electrode plate, preventing the BDD electrode plate from being easily clogged to ensure the treatment effect of the BDD electrode. (2) The present invention utilizes ozone micro-nano bubble technology coupled with the BDD electrode process to produce a synergistic effect, generating a large number of hydroxyl free radicals, strengthening the oxidation capacity, improving the organic matter removal capacity, and enhancing the sterilization, decolorization and deodorization capabilities of the device for raw water, thereby better ensuring that the water body meets the discharge standards. (3) The present invention combines BDD with flotation technology, reducing the floor space and optimizing the layout. (4) The flotation superposition filter tank further removes fine particles in the water body, thereby further reducing the concentration of suspended particulate matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of a water treatment device using an ozone micro-nano bubble coupled electrochemical oxidation process according to the present invention.

[0023] The numbers in the figure are: 1-circulating cooling water device; 2-ozone generator; 3-air volume regulating valve; 4-air guide hose; 5-micro-nano bubble generator; 6-check valve; 7-Venturi ejector; 8-sewage pump; 9-flow regulating valve; 10-flow meter; 11-BDD electrode module; 12-voltage-stabilized power supply; 13-contact area; 14-separation and filtration area; 15-slag scraper; 16-slag discharge trough; 17-backwash drain pipe; 18-filter material; 19-long-handled filter head; 20-filter plate; 21-water distribution filter beam; 22-water and air distribution trough; 23-backwash air inlet pipe; 24-blower; 25-backwash water inlet pipe; 26-control valve; 27-connecting pipe; 28-clear water tank; 29-liquid level regulator. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] The utility model provides a water treatment device for an ozone micro-nano bubble coupled electrochemical oxidation process, comprising an ozone generator, a micro-nano bubble generator, a BDD (boron-doped diamond) electrode unit and a flotation filter device. The ozone generator comprises an ozone generator 2, the micro-nano bubble generator comprises a micro-nano bubble generator 5 and a venturi ejector 7, the BDD electrode unit comprises a BDD electrode module 11, and the flotation filter device comprises a flotation filter, a scraper 15 and a filter material 18.

[0026] The above-mentioned flotation filter is divided into a contact zone 13 (i.e., a contact chamber) and a separation and filtration zone 14 by a partition. The ozone generator 2 is connected to the micro-nano bubble generator 5, the Venturi ejector 7 is arranged at the lower part of the contact zone 13, the BDD electrode module 11 is arranged in the middle part of the contact zone 13, the water inlet of the micro-nano bubble generator 5 is connected to the return water outlet of the clear water tank 28, the water outlet of the micro-nano bubble generator 5 is connected to the Venturi ejector 7, the scraper 15 is arranged at the upper part of the separation and filtration zone 14, and the filter material 18 is arranged at the lower part of the separation and filtration zone 14.

[0027] Specifically, the ozone generator also includes a circulating water cooling device 1, which is connected to the ozone generator 2 through a cooling water inlet pipe and a cooling water outlet pipe; the ozone generator 2 is specifically connected to the micro-nano bubble generator 5 through an air guide hose 4, and the water outlet of the micro-nano bubble generator 5 is specifically connected to the Venturi ejector 7 through a connecting pipe, wherein the air guide hose 4 is provided with an air volume regulating valve 3, and the connecting pipe is provided with a check valve 6.

[0028] The present invention also includes a sewage pump 8 connected to the contact area 13 via a sewage pipe, wherein the sewage pipe is equipped with a flow control valve 9 and a flow meter 10. The BDD electrode unit also includes a voltage-regulated power supply 12, to which a BDD electrode module 11 is connected. The BDD electrode module 11 is horizontally arranged above the Venturi ejector 7, and the number of BDD electrode modules 11 can be multiple. Furthermore, the number of Venturi ejectors 7 can also be multiple.

[0029] Specifically, the contact zone 13 is located on the left side of the flotation filter, and a slag discharge trough 16 is provided on the upper right side of the separation filter zone 14. Preferably, the flotation filter apparatus further includes a backwash drain pipe 17, a filter plate 20, and a water distribution filter beam 21 disposed within the separation filter zone 14. The surface of the filter plate 20 is evenly distributed with multiple long-handled filter tips 19. The backwash drain pipe 17 is located above the filter media 18, which is disposed on the filter plate 20, which is disposed on the water distribution filter beam 21. The backwash drain pipe 17 is provided with a through hole communicating with the separation filter zone 14 and a control valve for controlling the backwash drain pipe 17's opening and closing. The bottom of the water distribution filter beam 21 is provided with a water hole, and a water and air distribution groove 22 is formed between the filter plate 20 and the bottom of the separation filter zone 14. The filter media 18 can specifically include two layers: one layer of anthracite and the other of quartz sand. Of course, other types of filter media can also be replaced and provided according to wastewater quality requirements, and this is not limited here.

[0030] Preferably, the water and air distribution trough 22 is connected to the liquid level regulator 29 inside the clean water tank 28 via a connecting pipe 27. The flotation filter device also includes a blower 24 and a backwash air inlet pipe 23, and the blower 24 is connected to the water and air distribution trough 22 via the backwash air inlet pipe 23. In addition, the utility model may also include a backwash water inlet pipe 25, which is connected to the connecting pipe 27. The backwash water inlet pipe 25 can be used to introduce backwash water into the separation and filtration area 14. At the same time, the backwash water inlet pipe 25 can also serve as an outlet pipe for discharging the water stored in the separation and filtration area 14. In addition, in order to facilitate the control of the opening and closing status of the pipeline, the backwash air inlet pipe 23, the connecting pipe 27, and the backwash water inlet pipe 25 are all provided with a control valve 26.

[0031] The following describes the various working stages of the water treatment device of the utility model using an ozone micro-nano bubble coupled electrochemical oxidation process:

[0032] Operation phase: (1) Air is drawn into the ozone generator 2 as the gas source. The ozone generator 2 is connected to the micro-nano bubble generator 5 through the air guide hose 4. The water inlet of the micro-nano bubble generator 5 is connected to the water outlet of the clean water tank 28. The water inlet of the first operation is connected to the clean water of the clean water tank 28. (2) Ozone and clean water are mixed and pressurized by the micro-nano bubble generator 5 to form dissolved air water, and further a large number of ozone micro-nano bubbles are released in the contact area 13 through the venturi ejector 7. (3) Raw water is discharged into the contact area 13 of the flotation filter tank through the sewage pump 8 through the sewage pipe. Ozone micro-nano bubbles are mixed with raw water, and the released micro-bubbles combine with suspended matter in the water body; ozone fusion micro-nano bubbles can release a large number of hydroxyl free radicals, improve the oxidation work ability of ozone, and play the role of decolorization, sterilization, deodorization, deodorization, and degradation of organic matter. (4) A plurality of BDD electrode modules 11 are arranged above the venturi ejector 7 in the contact zone 13. The BDD electrode modules 11 electrolytically release hydroxyl groups, which, coupled with the ozone micro-nano bubble technology, produce a synergistic effect, further strengthening the oxidation and degradation of organic matter in the water. In addition, while the venturi ejector 7 releases a large number of ozone micro-nano bubbles, it also plays the role of stirring and mixing the liquid and flushing the BDD electrode modules 11, so that the liquid in the contact zone 13 can be fully mixed and fully contacted with the BDD electrode modules 11. In addition, the flushing effect of the venturi ejector 7 makes it difficult for the electrodes of the BDD electrode modules 11 to be blocked. (5) Furthermore, the scum formed by the suspended matter and the like combined with the ozone micro-nano bubbles floats to the water surface, and the scum is scraped to the slag discharge trough 16 by the scraper 15 and then discharged from the treatment device of the present invention. (6) After solid-liquid separation, the effluent flows vertically downward through the two layers of filter media 18 made of anthracite and quartz sand at the lower end of the separation filter area 14. The fine particles remaining in the water are intercepted by the filter media 18. The clean water passes through the long-handled filter heads 19 evenly distributed on the surface of the filter plate 20, the water holes of the water distribution filter beam 21, and is connected to the liquid level regulator 29 in the clean water tank 28 by the connecting pipe 27 to adjust the water level (the control valve of the backwash water inlet pipe 25 is closed during this process), and is finally discharged.

[0033] Backwashing stage: includes air scrubbing and water backwashing. (1) Air scrubbing: When the filter media 18 intercepts and retains particulate matter in the water and reaches saturation or the effluent water quality exceeds the standard, the water inlet valves of the micro-nano bubble generator 5, the sewage pump 8, etc. are closed to stop the water inlet; the control valve of the connecting pipe 27 is closed, and the control valve of the backwash water inlet pipe 25 is opened (at this time, the backwash water inlet pipe 25 is not connected to the backwash pump). At this time, the backwash water inlet pipe 25 serves as an outlet pipe to lower the water level in the flotation filter tank (for example, the water level can be lowered to 200 mm from the surface of the filter media 18). Then, the control valve of the backwash water inlet pipe 25 is closed; the control valve of the backwash drain pipe 17 is opened, and the water and air distribution trough 22 is connected to the air through the backwash inlet pipe 23 and the blower 24. The air is used to backwash from bottom to top to loosen the filter media 18 and flush out the retained fine particles. This process lasts for 5 minutes. After the process ends, the aeration of the backwash inlet pipe 23 is stopped. (2) Water backwashing: After the above-mentioned air scrubbing is completed, water backwashing is performed; the backwash water inlet pipe 25 is connected to the backwash water through the backwash pump, and the control valve of the backwash water inlet pipe 25 is opened. After the backwash water enters the separation filter area 14, it passes through the water hole at the bottom of the water distribution filter beam 21, the long-handled filter head 19 on the surface of the filter plate 20, and passes upward through the filter material 18, and is finally discharged from the backwash drain pipe 17. This water backwashing process brings out the fine particles flushed out by the above-mentioned air scrubbing, and restores the filtering capacity of the filter material 18. The water backwashing process lasts for 8 minutes, and the machine is restarted after it is completed.

[0034] Compared with the existing technology, the present invention provides a water treatment device that couples ozone micro-nano bubbles with electrochemical oxidation technology, which has the following beneficial effects: (1) The Venturi ejector is not easy to clog. The present invention uses a Venturi ejector to release ozone micro-nano bubbles, which can fully mix the wastewater and micro-nano bubbles and fully contact and oxidize and degrade with the BDD electrode. The impact force formed by the jet can flush the BDD electrode plate, preventing the BDD electrode plate from being easily clogged to ensure the treatment effect of the BDD electrode. (2) The present invention utilizes ozone micro-nano bubble technology coupled with the BDD electrode process to produce a synergistic effect, generating a large number of hydroxyl free radicals, strengthening the oxidation capacity, improving the organic matter removal capacity, and enhancing the sterilization, decolorization and deodorization capabilities of the device for raw water, thereby better ensuring that the water body meets the discharge standards. (3) The present invention combines BDD with flotation technology, reducing the floor space and optimizing the layout. (4) The flotation superposition filter tank further removes fine particles in the water body, thereby further reducing the concentration of suspended particulate matter.

[0035] The above-mentioned components included in the water treatment device of the ozone micro-nano bubble coupled electrochemical oxidation process of the present invention are all common standard parts in the field or existing technical components known to those skilled in the art. Their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods, and the present invention will not elaborate on them in detail.

[0036] It should be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

Claims

1. A water treatment device using an ozone micro-nano bubble coupled electrochemical oxidation process, comprising an ozone generator, a micro-nano bubble generator, a BDD electrode unit, and a flotation filter device, wherein the ozone generator comprises an ozone generator, the micro-nano bubble generator comprises a micro-nano bubble generator and a venturi ejector, the BDD electrode unit comprises a BDD electrode module, and the flotation filter device comprises a flotation filter, a scraper, and filter media, and is characterized in that: The flotation filter is divided into a contact zone and a separation and filtration zone by a partition. The ozone generator is connected to the micro-nano bubble generator. The venturi ejector is arranged at the lower part of the contact zone. The BDD electrode module is arranged in the middle part of the contact zone. The water inlet of the micro-nano bubble generator is connected to the return water outlet of the clear water tank, and the water outlet of the micro-nano bubble generator is connected to the venturi ejector. The scraper is arranged at the upper part of the separation and filtration zone, and the filter material is arranged at the lower part of the separation and filtration zone.

2. The water treatment device according to claim 1, characterized in that: The ozone generator also includes a circulating water cooling device, which is connected to the ozone generator through a cooling water inlet pipe and a cooling water outlet pipe; the ozone generator is specifically connected to the micro-nano bubble generator through an air guide hose, and the water outlet of the micro-nano bubble generator is specifically connected to the Venturi ejector through a connecting pipe, wherein the air guide hose is provided with an air volume regulating valve, and the connecting pipe is provided with a check valve.

3. The water treatment device of claim 1, characterized in that: It also includes a sewage pump, which is connected to the contact area through a sewage pipe, wherein the sewage pipe is provided with a flow regulating valve and a flow meter.

4. The water treatment device of claim 1, characterized in that: The BDD electrode unit further includes a voltage-stabilized power supply, and the BDD electrode module is connected to the voltage-stabilized power supply.

5. The water treatment device of claim 1, characterized in that: The contact area is located on the left side of the flotation filter tank, and a slag discharge trough is provided on the upper right side of the separation and filtration area.

6. The water treatment device according to claim 1, characterized in that: The flotation filter device also includes a backwash drain pipe, a filter plate and a water distribution filter beam arranged in the separation and filtration area. A plurality of long-handled filter heads are evenly distributed on the surface of the filter plate. The backwash drain pipe is located above the filter material. The filter material is arranged on the filter plate. The filter plate is arranged on the water distribution filter beam. The backwash drain pipe is provided with a through hole communicating with the separation and filtration area. The backwash drain pipe is also provided with a control valve. A water hole is provided at the bottom of the water distribution filter beam. A water and air distribution groove is formed between the filter plate and the bottom of the separation and filtration area.

7. The water treatment device according to claim 6, characterized in that: The water and air distribution trough is connected to the liquid level regulator inside the clean water tank through a connecting pipe.

8. The water treatment device according to claim 7, characterized in that: The flotation filter device further includes a blower and a backwash air inlet pipe, and the blower is connected to the water and air distribution tank through the backwash air inlet pipe.

9. The water treatment device according to claim 8, characterized in that: It also includes a backwash water inlet pipe, which is connected to the connecting pipe.

10. The water treatment device according to claim 9, characterized in that: The backwash air inlet pipe, the connecting pipe, and the backwash water inlet pipe are all provided with the control valve.

Images