A photocatalytic oxidation device for treating oily wastewater
By using a combination of an oil removal tower with internal partitions and an oil removal circulation tank in the photocatalytic oxidation device, the problem of difficulty in effectively removing grease in the prior art is solved, efficient separation and circulating oil removal of grease is achieved, and the wastewater treatment cost is reduced.
Patent Information
- Application Number
- CN202421063218.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-16
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-05-16
AI Technical Summary
The prior art is difficult to effectively remove grease when treating oil-containing wastewater, which affects the photocatalytic oxidation effect of ozone. Moreover, due to the large area, the traditional gravity separation method is difficult to implement in a wastewater treatment plant with limited sites.
A photocatalytic oxidation device for treating oil-containing wastewater was designed, and a combination of an oil-depleting tower with an internal partition and an oil-depleting circulation tank was used. By combining the multi-layer oil-depleting tower with an oil-depleting circulation tank, efficient separation and circulation of oil-depleting and oil removal were achieved.
The device can achieve efficient separation of grease on a small footprint, improve oil removal efficiency and removal rate, and reduce wastewater treatment costs.
Smart Images
Figure CN222729538U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wastewater treatment, and specifically relates to a photocatalytic oxidation device for treating wastewater containing grease. Background Art
[0002] Ozone photocatalytic oxidation has a good application in wastewater treatment, especially in the degradation of COD. In the ozone catalytic process, a catalyst is required, and nanocatalysts have better effects in photocatalytic oxidation. However, when there is grease in the wastewater, the grease is easily wrapped or adsorbed on the catalyst surface, affecting the photocatalytic oxidation effect of ozone. The source of wastewater is complex and it is difficult to avoid mixing with grease. Therefore, reducing the grease content in wastewater is of great significance to improving the effect of ozone photocatalytic oxidation.
[0003] From the perspective of short-term economic benefits, wastewater treatment is a high-input, low-output technology industry. Therefore, reducing the cost of wastewater treatment is more conducive to improving the enthusiasm of enterprises for wastewater treatment, and reducing equipment costs is an important aspect of reducing wastewater treatment costs. At present, the main methods for separating oil and fat from wastewater are gravity separation, air flotation, membrane separation, chemical treatment, biological treatment, etc. Among these methods, except for the relatively low cost of gravity separation, the equipment costs of the other methods are relatively high.
[0004] The common gravity separation method is to set up a sedimentation tank and a screen. In the sedimentation tank, the wastewater is slowed down to make the grease float under the action of gravity, forming a floating oil layer, which is discharged through overflow. The screen can filter out larger grease particles and solid particles. Since this method mainly relies on slowing down the flow rate of wastewater to achieve grease separation, in order to improve the grease separation effect, the wastewater needs to have enough residence time in the sedimentation tank, so it is necessary to increase the volume and area of the sedimentation tank, which is obviously impossible for wastewater treatment plants with limited space. Summary of the invention
[0005] In order to overcome the problems existing in the background technology, the utility model provides a photocatalytic oxidation device for treating oil-containing wastewater. By setting an oil removal tower with an internal partition, the separation of oil can be achieved using equipment with a smaller footprint. In addition, the utility model further improves the oil removal effect and removal rate through the combination of multi-layer oil removal towers and oil removal circulation tanks.
[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:
[0007] The photocatalytic oxidation device for treating oil-containing wastewater comprises an oil removal tower, an oil removal circulation tank and an oil removal circulation pump; the oil removal tower comprises a tower body and a partition arranged in the tower body, the partition divides the tower body into a plurality of oil removal sections; the upper part of each oil removal section is respectively provided with an emptying pipe and an oil discharge outlet, and the emptying pipe is higher than the oil discharge outlet; the oil discharge outlet of each oil removal section is connected to the oil removal circulation tank through an oil discharge pipe A; each partition is respectively provided with a lower liquid pipe connected to the next oil removal section; the inlet of the oil removal circulation pump is connected to the oil removal circulation tank, and the outlet is connected to the top of the first partition of the oil removal tower through a pipeline.
[0008] Preferably, a liquid inlet buffer plate is provided on each partition.
[0009] Preferably, each oil removal section is provided with a liquid level gauge, and each downpipe is provided with a control valve; the liquid level gauge of each oil removal section is interlocked with the control valve on its downpipe.
[0010] Preferably, an oil removal baffle and a water outlet baffle are provided in the oil removal circulation tank; a water inlet area is formed between the oil removal baffle and the tank body of the oil removal circulation tank; a water outlet area A is formed between the water outlet baffle and the tank body of the oil removal circulation tank; a water through hole is provided at the lower part of the oil removal baffle; a water through channel is provided at the lower part of the water outlet baffle; an oil drain pipe A is connected to the water inlet area; an inlet pipe of the oil removal circulation pump is connected to the water outlet area A; and oil drain pipes B are provided on the left sides of the oil removal baffle and the water outlet baffle, respectively.
[0011] Preferably, the water inlet area of the oil removal circulation tank is also connected to a wastewater inlet pipe, and a flow meter is provided on the wastewater inlet pipe.
[0012] Preferably, the photocatalytic oxidation device for treating oil-containing wastewater also includes a photocatalytic oxidation device and a delivery pump; the inlet pipe of the delivery pump is connected to the bottom of the oil removal tower, and the outlet pipe is connected to the water inlet of the photocatalytic oxidation device.
[0013] Preferably, the photocatalytic oxidation equipment is a tower structure with a UV lamp installed inside. The tower body is divided into a water inlet buffer zone, a photocatalytic oxidation reaction zone and a water outlet zone B from bottom to top; an aeration device is provided at the bottom of the water inlet buffer zone, and a buffer gas mixing net is provided above the aeration device; a catalyst packing layer is provided in the photocatalytic oxidation reaction zone, and the catalyst packing layer is a ring structure; the UV lamp is inserted from the center of the catalyst packing layer; and a water outlet is provided in the water outlet zone B.
[0014] Beneficial effects of the utility model:
[0015] The utility model divides the oil removal tower into a plurality of oil removal sections from top to bottom by arranging an oil removal tower with an internal partition, and the waste water is separated from the oil once in each oil removal section, and the efficient separation of oil and fat can be achieved by using equipment with a small occupation area.
[0016] The utility model uses an oil removal tower in conjunction with an oil removal circulation tank to circulate and remove oil from wastewater. The circulated oil removal method can increase the discharge amount of upper grease and water in each oil removal section and ensure the grease discharge rate. The oil removal circulation tank can also initially separate the discharged wastewater and grease and return them to the oil removal tower for circulated oil removal, thereby improving the oil removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0018] Figure 2 This is the internal structure diagram of the oil removal circulation tank of the utility model;
[0019] Figure 3 yes Figure 2 A top view of
[0020] In the figure, 1-oil removal circulation tank, 2-oil removal circulation pump, 3-tower body, 4-interlayer, 5-drain pipe, 6-oil drain pipe A, 7-lower liquid pipe, 8-liquid inlet buffer plate, 9-liquid level gauge, 10-control valve, 11-oil removal baffle, 12-water outlet baffle, 13-water hole, 14-water passage, 15-oil drain pipe B, 16-wastewater inlet pipe, 17-water outlet, 18-delivery pump, 19-ultraviolet lamp, 20-water inlet buffer zone, 21-photocatalytic oxidation reaction zone, 22-water outlet zone B, 23-aeration device, 24-buffered gas mixing network. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technicians.
[0022] In the description of the present invention, unless otherwise specified, the terms "left", "right", etc. indicating directions or state relationships are based on the directions or state relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.
[0023] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.
[0024] like Figure 1-3As shown, the photocatalytic oxidation device for treating oil-containing wastewater includes an oil removal tower, an oil removal circulation tank 1, an oil removal circulation pump 2, a photocatalytic oxidation device and a delivery pump 18.
[0025] The oil removal tower includes a tower body 3 and a partition 4 arranged in the tower body 3, and the partition 4 divides the tower body 3 into multiple oil removal sections; the upper part of each oil removal section is respectively provided with a drain pipe 5 and an oil discharge outlet, and the drain pipe 5 is higher than the oil discharge outlet; the oil discharge outlet of each oil removal section is connected to the oil removal circulation tank 1 through the oil discharge pipe A6, and each partition 4 is respectively provided with a lower liquid pipe 7 connected to the next oil removal section, the inlet of the oil removal circulation pump 2 is connected to the oil removal circulation tank 1, and the outlet is connected to the top of the first partition of the oil removal tower through a pipeline. After the initial separation of oil and grease in the oil removal circulation tank 1, the sewage is transported to the top of the first interlayer 4 of the oil removal tower through the oil removal circulation pump 2, and is transported downward step by step from the first oil removal section through the downpipe 7 corresponding to each interlayer 4. Oil and water separation is completed once in each oil removal section, and the separated oil and grease returns to the oil removal circulation tank 1 through the oil discharge pipe A6. The wastewater is degreased after passing through the last interlayer 4 and is transported to the photocatalytic oxidation device through the delivery pump 18 for photocatalytic oxidation reaction. The original wastewater is transported to the oil removal circulation tank 1 through the wastewater inlet pipe 16 for wastewater replenishment. The wastewater inlet pipe 16 and the outlet pipe of the delivery pump 18 are respectively provided with flow meters. The flow meters monitor the inlet flow rate and the wastewater flow rate transported to the photocatalytic oxidation device to maintain the balance of wastewater water volume and ensure the stability of the water level in each oil removal section of the oil removal tower. The oil removal tower is used in conjunction with the oil removal circulation tank 1 to circulate and remove oil from the wastewater. This circulating oil removal method can increase the discharge amount of upper grease and water in each oil removal section and ensure the discharge rate of grease after separation. The oil removal circulation tank 2 can also initially separate the discharged wastewater from grease and return it to the oil removal tower for circulating oil removal, thereby improving the oil removal efficiency.
[0026] The water level determines the residence time of wastewater in each degreasing section, and the residence time determines the separation time of oil and water. To ensure the water level of each degreasing section, as a preferred solution, a liquid level gauge 9 is set in each degreasing section, and a control valve 10 is set on each downpipe 7. The liquid level gauge 9 of each degreasing section is interlocked with the control valve 10 on the downpipe 7 corresponding to it: the lower limit liquid level of the liquid level gauge 9 is set to a certain value. When the liquid level is lower than the lower limit liquid level, the control valve 10 on the downpipe 7 is closed. As long as the liquid level is higher than the lower limit value, the control valve 10 is always in an open state, so that the wastewater is continuously degreasing in each degreasing section, and the oil discharge outlet of each degreasing section is slightly higher than the lower limit liquid level. Due to the setting of the interlayer 4, in order to ensure the smooth flow of the downpipe, each degreasing section is provided with a drain pipe 5, and the drain pipe 5 is higher than the oil discharge outlet to prevent the wastewater from clogging the drain pipe 5.
[0027] As a preferred solution, a liquid inlet buffer plate 8 is provided on each partition 4. The liquid inlet buffer plate 8 can reduce the impact force of the wastewater transported through the lower liquid pipe 7 and improve the grease separation effect.
[0028] An oil removal partition 11 and a water outlet partition 12 are provided in the oil removal circulation tank 1. A water inlet area is formed between the oil removal partition 11 and the tank body of the oil removal circulation tank 1, and a water outlet area A is formed between the water outlet partition 12 and the tank body of the oil removal circulation tank 1. The inlet pipe of the oil removal circulation pump 2 is connected with the water outlet area A. A water hole 13 is provided at the lower part of the oil removal partition 11, and a water passage 14 is provided at the lower part of the water outlet partition 12. The oil discharge pipe A6 is connected with the water inlet area. The grease and water discharged from the oil removal tower are raised through the oil discharge pipe A6 and enter the water inlet area. The grease floats up, and water enters between the oil removal partition 11 and the water outlet partition 12 from the water hole 13. The grease continues to float between the oil removal partition 11 and the water outlet partition 12, and then enters the water outlet area A through the water outlet partition 12 after deoiling, and is transported to the oil removal tower by the oil removal circulation pump 2. The left sides of the oil removal baffle 11 and the water outlet baffle 12 are respectively provided with oil discharge pipes B15 to discharge the floating grease, and the grease discharged from the oil removal circulation tank 1 is treated separately.
[0029] The photocatalytic oxidation equipment is an existing structure. The utility model selects a photocatalytic oxidation equipment with a tower structure. A purple light lamp 19 is arranged in the tower. The tower body is divided into a water inlet buffer zone 20, a photocatalytic oxidation reaction zone 21 and a water outlet zone B22 from bottom to top. An aeration device 23 is arranged at the bottom of the water inlet buffer zone 20, and a buffer gas mixing net 24 is arranged above the aeration device 23. The buffer gas mixing net 24 can fully mix the wastewater with the oxygen generated by the aeration device 23 while buffering the impact of the water inlet, thereby improving the reaction efficiency of the wastewater in the photocatalytic oxidation reaction zone 21. The photocatalytic oxidation reaction zone 21 is provided with a catalyst packing layer, which is an annular structure, and the packing layer can be filled with catalyst. The purple light lamp 19 is inserted from the center of the catalyst packing layer. In order to avoid corrosion, a protective cover that allows light to pass through is arranged outside the purple light lamp 19. The water outlet zone B22 is provided with a water outlet 17, and the wastewater after the photocatalytic oxidation reaction is discharged from the water outlet 17.
[0030] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.
Claims
1. A photocatalytic oxidation device for treating oil-containing wastewater, characterized in that: The invention comprises an oil removal tower, an oil removal circulation tank (1) and an oil removal circulation pump (2); the oil removal tower comprises a tower body (3) and a partition (4) arranged in the tower body (3), the partition (4) dividing the tower body (3) into a plurality of oil removal sections; a drain pipe (5) and an oil discharge outlet are respectively arranged at the top of each oil removal section, and the drain pipe (5) is higher than the oil discharge outlet; the oil discharge outlet of each oil removal section is connected to the oil removal circulation tank (1) through an oil discharge pipe A (6); each partition (4) is respectively provided with a lower liquid pipe (7) connected to the next oil removal section; the inlet of the oil removal circulation pump (2) is connected to the oil removal circulation tank (1), and the outlet is connected to the top of the first partition of the oil removal tower through a pipeline.
2. The photocatalytic oxidation device for treating oil-containing wastewater according to claim 1, characterized in that: A liquid inlet buffer plate (8) is provided on each partition (4).
3. The photocatalytic oxidation device for treating oil-containing wastewater according to claim 1, characterized in that: Each oil removal section is provided with a liquid level meter (9), and each liquid down pipe (7) is provided with a control valve (10); the liquid level meter (9) of each oil removal section is interlocked with the control valve (10) on its liquid down pipe (7).
4. The photocatalytic oxidation device for treating oil-containing wastewater according to any one of claims 1 to 3, characterized in that: The oil removal circulation tank (1) is provided with an oil removal baffle (11) and a water outlet baffle (12); a water inlet area is formed between the oil removal baffle (11) and the tank body of the oil removal circulation tank (1); a water outlet area A is formed between the water outlet baffle (12) and the tank body of the oil removal circulation tank (1); a water through hole (13) is provided at the lower part of the oil removal baffle (11); a water through channel (14) is provided at the lower part of the water outlet baffle (12); an oil discharge pipe A (6) is connected to the water inlet area; an inlet pipe of the oil removal circulation pump (2) is connected to the water outlet area A; and oil discharge pipes B (15) are respectively provided on the left sides of the oil removal baffle (11) and the water outlet baffle (12).
5. The photocatalytic oxidation device for treating oil-containing wastewater according to claim 4, characterized in that: The water inlet area of the oil removal circulation tank (1) is also connected to a wastewater inlet pipe (16), and a flow meter is provided on the wastewater inlet pipe (16).
6. The photocatalytic oxidation device for treating oil-containing wastewater according to claim 5, characterized in that: It also includes a photocatalytic oxidation device and a delivery pump (18); the inlet pipe of the delivery pump (18) is connected to the bottom of the oil removal tower, and the outlet pipe is connected to the water inlet of the photocatalytic oxidation device.
7. The photocatalytic oxidation device for treating oil-containing wastewater according to claim 6, characterized in that: The photocatalytic oxidation device is a tower structure with a purple light lamp (19) arranged therein. The tower body is divided from bottom to top into a water inlet buffer zone (20), a photocatalytic oxidation reaction zone (21) and a water outlet zone B (22); an aeration device (23) is arranged at the bottom of the water inlet buffer zone (20), and a buffer gas mixing net (24) is arranged above the aeration device (23); a catalyst packing layer is arranged in the photocatalytic oxidation reaction zone (21), and the catalyst packing layer is a ring-shaped structure; the purple light lamp (19) is inserted from the center of the catalyst packing layer; and a water outlet zone B (22) is provided with a water outlet (17).