Low-pressure aeration membrane air flotation device for pretreatment of oily wastewater
By generating microbubbles under low pressure using a low-pressure aeration membrane module, the high cost and high energy consumption of traditional pressure dissolved air flotation devices are solved, achieving safe and reliable treatment of oily wastewater.
Patent Information
- Application Number
- CN202423022713.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-09
AI Technical Summary
Existing pressure dissolved air flotation devices are costly, energy-intensive, and have low safety and reliability when operating under high pressure, and cannot generate flotation microbubbles under low pressure.
By using a low-pressure aeration membrane module, and through the flotation tank, circulating pump and air compressor, high-pressure equipment is reduced. The low-pressure aeration membrane module generates microbubbles under low pressure, which increases the gas-liquid contact area and gas partial pressure, prolongs the bubble floating time and reduces flow resistance.
It reduces equipment costs and energy consumption, improves safety and reliability, and enables efficient separation of oily wastewater under low pressure, thereby reducing equipment pressure and power consumption.
Smart Images
Figure CN223561333U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to wastewater treatment technical field, especially, relate to a low pressure aeration membrane gas floatation device for oily wastewater pretreatment. BACKGROUND
[0002] Oily wastewater refers to the oily material wastewater discharged in the industrial production process, and the oil material contained in the oily wastewater includes natural oil, oil products, tar and its fraction, and edible animal and vegetable oil and fat, which will cause serious influence once discharged into water body, the oil film on the water surface can isolate air, the dissolved oxygen in water body is reduced to cause water body stink, the organism in water is dead, pollutes the atmosphere, influences the crop growth, and currently, the traditional pressure dissolved gas gas floatation is usually used as the core treatment mode for this wastewater, but it still has the following disadvantages in the actual use:
[0003] 1, the existing pressure dissolved gas gas floatation equipment is the traditional gas production mode, causes the equipment cost increase, the flotation work pressure is big, and the equipment operation energy consumption is high;
[0004] 2, the existing pressure dissolved gas gas floatation equipment is the traditional gas production mode, cannot produce flotation micro-bubbles under low pressure, causes the safety reliability reduction of equipment in the high pressure operation of pressure dissolved gas gas floatation, for this, we provide a low pressure aeration membrane gas floatation device for oily wastewater pretreatment to solve the problems in the above. UTILITY MODEL CONTENT
[0005] The utility model discloses a low pressure aeration membrane gas floatation device for oily wastewater pretreatment, compared with traditional pressure dissolved gas gas floatation equipment, the pressure dissolved gas tank, high pressure pump, pressure release ware and other equipment are reduced, and the pressure and power consumption are reduced, and the low pressure aeration membrane assembly can produce flotation micro-bubbles under low pressure, the gas-liquid contact area is big, the gas partial pressure is high, the bubble up-floating speed is slow, the gas-liquid contact time is long, the bubble is stable, is not easy to gather and is separated most under the characteristics of the micro-bubble fluid flow resistance small.
[0006] To solve the above technical problems, the utility model is realized through the following technical schemes:
[0007] The utility model discloses a low pressure aeration membrane gas floatation device for oily wastewater pretreatment, including the gas floatation groove, and the flow guide tube of installing at its inside bottom end center position, the one side below of gas floatation groove is installed with the circulating pump, and the one side of gas floatation groove is installed with the air compressor, and the low pressure aeration membrane assembly is arranged between gas floatation groove and air compressor;
[0008] The low pressure aeration membrane assembly includes the aeration tank arranged at one side of the gas floatation groove and the aeration membrane body installed at one side in the aeration tank.
[0009] The utility model further sets up, the outer wall bottom of guide tube is provided with guide tube import, another end of guide tube import is connected with first connecting pipe through pipe joint, another end of first connecting pipe is connected with waste water pipe and second connecting pipe through three-way joint and is passed through three-way joint and is penetrated to air float groove one side inner wall top.
[0010] The utility model further sets up, the outer wall bottom of guide tube is provided with guide tube import, another end of guide tube import is connected with first connecting pipe through pipe joint, another end of first connecting pipe is connected with waste water pipe and second connecting pipe through three-way joint and is passed through three-way joint and is penetrated to air float groove one side inner wall top.
[0011] The utility model further sets up, another end of fourth connecting pipe is connected with the water inlet end of circulating pump through pipe joint, the water outlet end of circulating pump is connected with fifth connecting pipe through pipe joint, and the top of air float groove is provided with slag scraping subassembly.
[0012] The utility model further sets up, the outer wall bottom of guide tube is provided with guide tube import, another end of guide tube import is connected with first connecting pipe through pipe joint, another end of first connecting pipe is connected with waste water pipe and second connecting pipe through three-way joint and is passed through three-way joint and is penetrated to air float groove one side inner wall top.
[0013] The utility model further sets up, the outer wall bottom of guide tube is provided with guide tube import, another end of guide tube import is connected with first connecting pipe through pipe joint, another end of first connecting pipe is connected with waste water pipe and second connecting pipe through three-way joint and is passed through three-way joint and is penetrated to air float groove one side inner wall top.
[0014] The utility model further sets up, the outer wall bottom of guide tube is provided with guide tube import, another end of guide tube import is connected with first connecting pipe through pipe joint, another end of first connecting pipe is connected with waste water pipe and second connecting pipe through three-way joint and is passed through three-way joint and is penetrated to air float groove one side inner wall top.
[0015] The utility model further sets up, the outer wall bottom of guide tube is provided with guide tube import, another end of guide tube import is connected with first connecting pipe through pipe joint, another end of first connecting pipe is connected with waste water pipe and second connecting pipe through three-way joint and is passed through three-way joint and is penetrated to air float groove one side inner wall top.
[0016] The utility model has following beneficial effect:
[0017] 1, the utility model discloses a circulating pump, air compressor and low pressure aeration membrane subassembly are set up through setting up air float groove, and the equipment that is used when handling oily waste water is reduced, compared with traditional pressure dissolved gas air float equipment, reduces pressure dissolved gas tank, high pressure pump, pressure release ware and so on equipment, reduces pressure and power consumption simultaneously, solves the problem that the existing pressure dissolved gas air float equipment is traditional gas production mode, causes equipment cost increase, and the problem of high equipment operation energy consumption of large flotation work pressure.
[0018] 2, The utility model discloses a low pressure aeration membrane assembly is set up, and the micro -hole on the aeration membrane body is used to cut gas and mix the supernatant of air floatation groove reflux to form micro -bubble, and the circulating pump is hit into the air floatation groove, and the characteristics of micro -bubble are used, and the gas -liquid contact area is big, and the gas partial pressure is high, and the bubble up -floating speed is slow, and the gas -liquid contact time is long, can produce the floatation micro -bubble under low pressure, and the bubble is stable, and is not easy to gather and merge, and the fluid flow resistance of containing micro -bubble is small, and most is separated under the characteristic action, the existing pressure gas dissolving air floatation equipment is the traditional gas production mode, cannot produce the floatation micro -bubble under low pressure, causes the safety reliability reduction of equipment when operating in the high pressure of pressure gas dissolving air floatation.
[0019] Of course, it is not necessary for any product embodying the utility model to achieve all the advantages mentioned above simultaneously. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used for the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.
[0021] Figure 1 It is a kind of low pressure aeration membrane air floatation device for oily wastewater pretreatment structure diagram Figure 1 .
[0022] Figure 2 It is a kind of low pressure aeration membrane air floatation device for oily wastewater pretreatment structure diagram Figure 2 .
[0023] Figure 3 It is the sectional view of air floatation groove.
[0024] Figure 4 It is the structure diagram of slag scraping assembly.
[0025] Figure 5 It is the sectional view of low pressure aeration membrane assembly.
[0026] In the drawings, the component list represented by each sign is as follows:
[0027] 1 - gas float groove, 101 - guide cylinder, 101a - guide inlet, 101b - first connecting pipe, 101c - waste water pipe, 101d - second connecting pipe, 102 - emptying port, 103 - clear liquid outlet, 103a - third connecting pipe, 103b - continuous pipe, 104 - slag scraping assembly, 104a - first side plate, 104b - second side plate, 104c - motor, 104d - rotating shaft, 104e - first sprocket, 104f - second sprocket, 104g - chain, 104h - slag scraping plate, 104i - auxiliary sprocket, 2 - circulating pump, 201 - fourth connecting pipe, 202 - fifth connecting pipe, 3 - air compressor, 4 - low-pressure aeration membrane assembly, 401 - aeration box, 401a - membrane air inlet, 401b - membrane air outlet, 401c - membrane water inlet, 402 - aeration membrane body. DETAILED DESCRIPTION
[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0029] Embodiment 1
[0030] Please refer to Figures 1 to 4 The utility model discloses a kind of low-pressure aeration membrane air floatation devices for oily wastewater pretreatment, including gas float groove 1, and the guide cylinder 101 of installation in its inside bottom end center position, circulating pump 2 is installed in the lower side of gas float groove 1, air compressor 3 is installed in the side of gas float groove 1, and low-pressure aeration membrane assembly 4 is provided between gas float groove 1 and air compressor 3.
[0031] Specifically, the outer wall bottom of the draft tube 101 is provided with a draft tube 101 inlet, the other end of the draft tube 101 inlet is connected with the first connecting pipe 101b through a pipe joint, the other end of the first connecting pipe 101b penetrates through the upper side of the inner wall of the air flotation tank 1 and is connected with the waste water pipe 101c and the second connecting pipe 101d through a three-way joint, the lower side of the outer wall of one side of the air flotation tank 1 is provided with an emptying port 102 and an air flotation tank 1 outlet respectively, the other end of the air flotation tank 1 outlet is connected with the third connecting pipe 103a through a pipe joint, the other end of the third connecting pipe 103a is connected with the continuous pipe 103b and the fourth connecting pipe 201 through a three-way joint, the other end of the fourth connecting pipe 201 is connected with the water inlet end of the circulating pump 2 through a pipe joint, the water outlet end of the circulating pump 2 is connected with the fifth connecting pipe 202 through a pipe joint, the top of the air flotation tank 1 is provided with a slag scraping assembly 104, the slag scraping assembly 104 includes a first side plate 104a installed at the top of the front end of the air flotation tank 1, and a motor 104c installed on the front end face of the first side plate 104a, the output shaft of the motor 104c is connected with a rotating shaft 104d through a shaft coupling, the other end of the rotating shaft 104d penetrates through the bearing on the first side plate 104a and is connected with the bearing on the inner wall of the second side plate 104b, the bottom of the second side plate 104b is fixed on the top of the rear end of the air flotation tank 1, the outer wall of the rotating shaft 104d is respectively sleeved with a first sprocket 104e and a second sprocket 104f, the outer wall of the first sprocket 104e and the second sprocket 104f is respectively sleeved with a chain 104g, the other side of the inside of the chain 104g is provided with an auxiliary sprocket 104i, and a slag scraping plate 104h is arranged between the front and rear adjacent chains 104g.
[0032] Further, the waste water pipe 101c is provided with a flow regulator, which can control the residence time according to the water quality conditions, the air compressor 3 is provided with a flow regulator, and the air volume is adjusted according to the water volume, generally 5%-10% of the treatment water volume, the circulating pump 2 generally has a return flow of 20%-30% of the treatment water volume, and the working pressure of the circulating pump 2 is <0.1MPa, thereby reducing the operating pressure and energy consumption.
[0033] The operation process of the embodiment is as follows: the oil-containing wastewater is introduced into the flow guide cylinder 101 from the flow guide inlet 101a through the wastewater pipe 101c and the first connecting pipe 101b of the previous treatment unit, and the oil-containing wastewater is transported into the air flotation tank 1 under the action of the flow guide cylinder 101. The residence time is controlled by adjusting the water inflow according to the water quality conditions, and the residence time is generally 15-30 minutes. Then, the air compressor 3 is used to introduce air into the aeration tank 401, and the air inflow is adjusted. The air quantity is 5%-10% of the water quantity to be treated. At the same time, the low-pressure aeration membrane assembly 4 cuts the gas on the membrane material and mixes it with the supernatant returned from the air flotation tank 1 to form micro-bubbles, which are punched into the air flotation tank 1 by the circulating pump 2. The circulating pump 2 has a return flow of 20%-30% of the water quantity to be treated. The generated micro-bubbles are introduced into the air flotation tank 1, and then the separated clear liquid flows into the next treatment unit through the clear liquid outlet 103. The separated oil residue and suspended matter are scraped away by the residue scraping assembly 104. The motor 104c is started. The output shaft of the motor 104c rotates to drive the rotating shaft 104d through the coupling. The rotation of the rotating shaft 104d drives the first sprocket 104e and the second sprocket 104f on the outer wall of the rotating shaft 104d to rotate. At this time, the front and rear two groups of chains 104g can be driven to rotate under the action of the auxiliary sprocket 104i, so that the residue scraping plate 104h moves and scrapes off the separated oil residue and suspended matter. At the same time, the clear liquid can be recycled and used under the action of the circulating pump 2. The working pressure of the circulating pump 2 is <0.1 MPa. The working pressure of the circulating pump 2 of the traditional pressure dissolved air flotation is 0.25-0.4 MPa. The pressure and power consumption are reduced.
[0034] Embodiment 2
[0035] Please refer to Figure 1 and Figure 5 On the basis of embodiment 1, different from the first embodiment is that a low-pressure aeration membrane assembly 4 is provided. The low-pressure aeration membrane assembly 4 includes an aeration tank 401 arranged on one side of the air flotation tank 1 and an aeration membrane body 402 installed on one side inside the aeration tank 401. The low-pressure aeration membrane assembly 4 solves the problem that the existing pressure dissolved air flotation equipment is a traditional gas production method, which cannot produce flotation micro-bubbles at low pressure, resulting in a decrease in safety and reliability of the equipment when it operates at high pressure in the pressure dissolved air flotation.
[0036] Specifically, the aeration tank 401 is provided with a membrane air inlet 401a at the center of one side end face. The other end of the membrane air inlet 401a is connected with the air outlet of the air compressor 3 through a pipe joint. The aeration tank 401 is provided with a membrane air outlet 401b at the center of the other side end face. The other end of the membrane air outlet 401b is connected with the second connecting pipe 101d through a pipe joint. The aeration tank 401 is provided with a membrane water inlet 401c at the bottom of one side. The other end of the membrane water inlet 401c is connected with the fifth connecting pipe 202 through a pipe joint.
[0037] Further, the aeration membrane body 402 cuts the gas with the micro-holes on the membrane material to mix with the supernatant to form micro-bubbles, so that the gas-liquid contact area is large, the gas partial pressure is high, the bubble floating speed is slow, the gas-liquid contact time is long, the floating micro-bubbles can be generated under low pressure, the bubbles are stable, and the bubbles are not easy to coalesce.
[0038] The operation process of the embodiment is as follows: when the air compressor 3 is started to supply air to the aeration tank 401, the micro-holes on the aeration membrane body 402 (membrane material) in the aeration tank 401 cut the gas to mix with the supernatant flowing back from the air flotation tank 1 to form micro-bubbles, which are punched into the air flotation tank 1 by the circulating pump 2. Due to the characteristics of the micro-bubbles, the gas-liquid contact area is large, the gas partial pressure is high, the bubble floating speed is slow, the gas-liquid contact time is long, the floating micro-bubbles can be generated under low pressure, the bubbles are stable, and the bubbles are not easy to coalesce. Under the action of the characteristics that the flow resistance of the fluid containing the micro-bubbles is small, most of the fluid is separated, and then the separated clean water flows into the next processing unit through the overflow port. The aeration membrane body 402 can be connected in parallel or series and the number can be matched according to the engineering situation and the wastewater treatment capacity, the operation is simple, the disassembly is convenient, the ton water operation power consumption of the whole equipment is 0.04-0.1 kWh, and the energy saving advantage is very large compared with the traditional pressure dissolved air flotation of 0.3-0.8 kWh / ton water.
[0039] In the description of the specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0040] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details, and the utility model is limited to the specific embodiments described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that the persons skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the whole scope and equivalents thereof.
Claims
1. A low-pressure aerated membrane flotation device for pretreatment of oily wastewater, comprising a flotation tank (1) and a guide tube (101) installed at the center of its bottom end, characterized in that: A circulating pump (2) is installed below one side of the air flotation tank (1), an air compressor (3) is installed on one side of the air flotation tank (1), and a low-pressure aeration membrane assembly (4) is provided between the air flotation tank (1) and the air compressor (3). The low-pressure aeration membrane assembly (4) includes an aeration box (401) disposed on one side of the air flotation tank (1) and an aeration membrane body (402) installed inside the aeration box (401).
2. The low-pressure aerated membrane flotation device for pretreatment of oily wastewater according to claim 1, characterized in that, The bottom of the outer wall of the guide tube (101) is provided with the guide tube (101) inlet. The other end of the guide tube (101) inlet is connected to the first connecting pipe (101b) through a pipe joint. The other end of the first connecting pipe (101b) passes through the upper part of the inner wall of one side of the air flotation tank (1) and is connected to the wastewater pipe (101c) and the second connecting pipe (101d) through a three-part joint.
3. The low-pressure aerated membrane flotation device for pretreatment of oily wastewater according to claim 2, characterized in that, The air flotation tank (1) has an air outlet (102) and an air flotation tank (1) outlet respectively located on the lower side of one outer wall. The other end of the air flotation tank (1) outlet is connected to the third connecting pipe (103a) through a pipe joint. The other end of the third connecting pipe (103a) is connected to the continuous pipe (103b) and the fourth connecting pipe (201) through a three-part connector.
4. The low-pressure aerated membrane flotation device for pretreatment of oily wastewater according to claim 3, characterized in that, The other end of the fourth connecting pipe (201) is connected to the inlet of the circulating pump (2) through a pipe joint, and the outlet of the circulating pump (2) is connected to the fifth connecting pipe (202) through a pipe joint. A sludge scraping assembly (104) is provided on the top of the air flotation tank (1).
5. The low-pressure aerated membrane flotation device for pretreatment of oily wastewater according to claim 4, characterized in that, The slag scraping assembly (104) includes a first side plate (104a) installed at the top front end of the air flotation tank (1) and a motor (104c) installed on the front end face of the first side plate (104a). The output shaft of the motor (104c) is connected to a rotating shaft (104d) via a coupling. The other end of the rotating shaft (104d) passes through a bearing on the first side plate (104a) and is connected to a bearing on the inner wall of the second side plate (104b).
6. The low-pressure aerated membrane flotation device for pretreatment of oily wastewater according to claim 5, characterized in that, The bottom of the second side plate (104b) is fixed to the top rear end of the air flotation tank (1). The outer walls of the rotating shaft (104d) are respectively fitted with a first sprocket (104e) and a second sprocket (104f). Chains (104g) are respectively fitted on the outer walls of the first sprocket (104e) and the second sprocket (104f). An auxiliary sprocket (104i) is provided on the other side of the inside of the chain (104g). A scraper plate (104h) is provided between adjacent chains (104g).
7. A low-pressure aerated membrane flotation device for pretreatment of oily wastewater according to claim 6, characterized in that, A membrane air inlet (401a) is provided at the center of one end face of the aeration box (401), and the other end of the membrane air inlet (401a) is connected to the air outlet of the air compressor (3) through a pipe joint. A membrane air outlet (401b) is provided at the center of the other end face of the aeration box (401).
8. A low-pressure aerated membrane flotation device for pretreatment of oily wastewater according to claim 7, characterized in that, The other end of the membrane air outlet (401b) is connected to the second connecting pipe (101d) through a pipe connector. A membrane water inlet (401c) is provided on one side of the bottom of the aeration box (401). The other end of the membrane water inlet (401c) is connected to the fifth connecting pipe (202) through a pipe connector.