A petrochemical wastewater treatment device

Abstract

The present invention relates to a petrochemical wastewater treatment device, comprising a housing and an air flotation column having an air flotation chamber. The housing is provided with a diversion trough, a chemical tank, and a biological chamber. The diversion trough is used to input wastewater, and the air flotation column is used to inject air to form bubbles and bind particulate matter in the wastewater. The chemical tank is filled with a catalyst for decomposing organic matter. A water pump is connected between the chemical tank and the air flotation column to drive wastewater from the air flotation column to the chemical tank. The biological chamber is filled with filler, which is used for microbial growth and organic matter degradation. The lower end of the biological chamber is provided with a biological chamber inlet, which is connected to the chemical tank outlet. The upper end of the biological chamber is provided with a drain pipe for discharging treated wastewater. The device is integrated into the housing and forms an annular structure, which is simple and significantly reduces costs.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a petrochemical wastewater treatment device. Background Art

[0002] The primary pollutants in petrochemical wastewater are complex compounds composed of cyclic and acyclic saturated monobasic acids, which are difficult to volatilize and biodegrade. Therefore, optimization in the pretreatment stage is necessary to address these issues during advanced treatment.

[0003] The pretreatment stage of petrochemical wastewater mainly uses physical methods, such as oil separation, filtration, flocculation sedimentation, centrifugation, flotation, etc.

[0004] The flotation process and the subsequent catalytic oxidation biological purification process in the traditional process are independent. Flotation can only remove suspended matter and cannot play a role in oxygenation, which makes the process less efficient.

[0005] Furthermore, traditional processes require the investment and construction of numerous fixed structures, such as flotation tanks, biochemical tanks, and secondary sedimentation tanks. These structures occupy a large area and cannot be moved or easily adapted to process flow. This results in a significant upfront investment. Once the product is changed, some of these structures become unusable and must be dismantled, resulting in significant time and effort waste. Summary of the Invention

[0006] In order to solve the technical problems in the background technology, the present invention discloses a petrochemical wastewater treatment device.

[0007] The present invention provides a petrochemical wastewater treatment device, comprising a shell and an air flotation column with an air flotation cavity, wherein a guide groove, a chemical groove and a biological cavity are arranged in the shell;

[0008] The two ends of the diversion trough are respectively provided with a diversion trough inlet and a diversion trough outlet, and the wastewater is input from the diversion trough inlet;

[0009] The top of the air flotation column is provided with an overflow port, the side of the upper end is provided with an air flotation column inlet, which is connected to the outlet of the guide groove; the side of the lower end of the air flotation column is provided with an air flotation column outlet;

[0010] The air flotation column is provided with a bubble retention device for extending the retention time of bubbles inside. The bubble retention device includes an elastic hose provided on the air flotation column and an adjustment component on the hose for adjusting the hose diameter.

[0011] The lower end of the air flotation column is provided with a bubble generating device, the outlet of which is located below the hose, and air is filled into the air flotation cavity to form bubbles;

[0012] A chemical tank inlet is provided at one end of the chemical tank and is connected to the outlet of the air flotation column; a chemical tank outlet is provided on the upper side of the other end of the chemical tank; the chemical tank is filled with a granular catalyst for decomposing organic matter;

[0013] A water pump is also connected between the chemical tank and the air flotation column to drive the wastewater from the air flotation column to the chemical tank;

[0014] Fillers for microbial growth are provided in the biocavity;

[0015] The lower end of the biological chamber is provided with a biological chamber inlet which is communicated with the chemical tank outlet; the upper end of the biological chamber is provided with a drainage outlet which is communicated with the chemical tank outlet.

[0016] The beneficial effects of the present invention are as follows: 1. The device has a high degree of integration, integrating flotation, oxidation and biodegradation in a shell and forming an annular structure, which is simple in structure and greatly reduces costs; 2. The device can be made mobile, easy to move and use in treating different chemical product production wastewater; 3. The device can be used in parallel in multiple units to meet the treatment requirements of different water volumes; 4. The device can be produced in a factory, and the biofilm on the filler can be prepared in advance, which saves time for biodegradation startup and saves time for the start of production in petrochemical production; 5. The device can extend the residence time of bubbles by adjusting the pipe diameter, fully utilizing the air used for flotation and slag removal, extending the mass transfer time and gas-solid contact time, allowing particulate matter to fully contact and adhere to the bubbles, making it easier to remove the particulate matter, and also dissolving more oxygen into the wastewater to be treated; 6. The wastewater containing dissolved oxygen reacts directly under the action of the catalyst, so that organic matter in the wastewater can be directly degraded or partially degraded, breaking down large molecules into small molecules and degrading difficult-to-biodegrade substances into easily biodegradable substances, which can be degraded by the action of microorganisms.

[0017] In order to improve the connection strength of the hose, a further design is as follows: the upper and lower ends of the hose are connected to a hard top tube and bottom tube respectively; the overflow port is located at the upper end of the top tube, and the air flotation column inlet is located on the side of the top tube, making the structure of the overflow port and the air flotation column inlet more stable; the air flotation column outlet is located on the side of the bottom tube, and the bubble generating device is installed on the bottom tube, making the installation structure of the bubble generating device more stable.

[0018] The bubble generating device specifically comprises an aeration head connected to the outlet of the aerator through a pipeline.

[0019] The location of the drain outlet directly affects the degree of degradation of organic matter in the wastewater. Based on this, the further design is: the drain outlet is located above the filler.

[0020] In order to prevent bubbles from being drawn into the water pump and affecting the efficiency of removing particulate matter in the wastewater, a further improvement is that the outlet of the bubble generating device is located above the inlet of the chemical tank.

[0021] If the distance between the outlet of the flotation column and the outlet of the bubble generating device is too short, some bubbles will still enter the water pump. Based on this, a further improvement is that a transition chamber connected to the flotation chamber is extended from the outlet of the flotation column toward the chemical tank, and the transition chamber is located below the outlet of the bubble generating device.

[0022] To improve the utilization of oxygen and catalytically active substances in the wastewater, a further improvement is the addition of a reflux chamber to the diversion trough, its two ends connected to the top pipe and the upper end of the biological chamber, respectively. This arrangement enables the entire wastewater treatment process to be a continuous circulation process, preventing the escape of dissolved oxygen and the waste of catalytically active substances, effectively increasing the degradation rate and reducing the size of the equipment.

[0023] Since biodegradation takes a long time, the diameter of the flotation column is smaller than that of the bio-cavity, which prolongs the retention time of wastewater in the bio-cavity and improves degradation efficiency.

[0024] To facilitate the removal of particulate matter trapped by the bubbles, a further improvement is the following: a foam collection channel extends downward from the top of the top pipe. The lower end of the foam collection channel is connected to the upper end of the top pipe and is equipped with a screen. The screen is positioned so that when the wastewater flows from the diversion trough to the flotation chamber, the screen is immersed in the wastewater in the flotation chamber. This arrangement allows particulate matter trapped by the bubbles to accumulate on the screen, making it easy to scrape and clean. The screen also prevents external particulate impurities from entering the flotation chamber.

[0025] The adjustment method of the hose directly affects the stability of its adjustment structure. Based on this, further improvements are: before the hose diameter is adjusted, it is consistent with the diameter of the top pipe and the bottom pipe; when the hose diameter is adjusted, its diameter is smaller than the diameter of the top pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and examples.

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 and schematic diagram of the installation structure of the hose clamp and hose;

[0029] In the figure: 1. Shell; 2. Diversion trough; 3. Air flotation column; 4. Chemical tank; 5. Biological chamber; 6. Water pump; 21. Diversion trough inlet; 22. Diversion trough outlet; 23. Filter; 24. Reflux chamber; 31. Overflow outlet; 32. Air flotation column inlet; 33. Air flotation column outlet; 34. Hose; 35. Hose clamp; 36. Top pipe; 37. Bottom pipe; 38. Aeration head; 39. Screen; 41. Chemical tank inlet; 42. Chemical tank outlet; 43. Catalyst; 44. Chemical tank filter; 51. Filler; 52. Biological chamber inlet; 53. Drain pipe; 301. Air flotation chamber; 302. Transition chamber; 303. Foam collection channel. DETAILED DESCRIPTION

[0030] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0031] like Figure 1 As shown, the present invention discloses a petrochemical wastewater treatment device, comprising a housing 1 and an air flotation column 3 having an air flotation chamber 301. The interior of the housing 1 is formed by partitions into three chambers: a guide trough 2, a chemical tank 4, and a biological chamber 5, which together with the air flotation chamber 301 form a "U" shape.

[0032] The diversion trough 2 is located at the upper end and arranged horizontally. It has an upward-facing diversion trough inlet 21 on its right side and a diversion trough outlet 22 on its left side. Wastewater enters the diversion trough inlet 21 and flows out of the diversion trough outlet 22. A filter 23 is installed on the diversion trough inlet 21 to filter solid impurities in the wastewater to prevent clogging and affecting the normal operation of the entire device.

[0033] The air flotation column 3 is arranged vertically and comprises a section of elastic hose 34 , with a hard top pipe 36 and a bottom pipe 37 connected to the upper and lower ends of the hose 34 respectively.

[0034] An aeration head 38 is mounted on the bottom pipe 37 and connected to the aerator outlet via piping. The aeration head 38 opens upward, injecting air into the flotation column 3 to form bubbles. The flared opening of the aeration head 38 increases the volume of bubbles and the area covered by them, thereby improving solids removal efficiency. The flotation column outlet 33 is located on one side of the bottom pipe 37.

[0035] The hose 34 is provided with an adjustment assembly for adjusting the diameter of the hose 34. Before the diameter of the hose 34 is adjusted, it is consistent with the diameter of the top pipe 36 and the bottom pipe 37. During adjustment, the diameter of the hose 34 is smaller than the diameter of the top pipe 36. This improves the stability of the diameter adjustment of the hose 34. The adjustment assembly can be, but is not limited to, a hose clamp 35. It can also be a steel wire or rope, which can be adjusted by loosening or tightening the hose 34 diameter. In this embodiment, the adjustment assembly is a hose clamp 35. By tightening the locking bolt on the hose clamp 35, the diameter of the hose clamp 35 can be adjusted, thereby adjusting the diameter of the hose 34. This can adjust the flow rate of wastewater flowing downward in the hose 34. Since the diameter of the air flotation column 3 is thick, the speed of water flowing from top to bottom is relatively slow, while the bubbles move from bottom to top under the action of buoyancy at a faster speed. By adjusting the thickness of the hose 34, the flow rate of water at the smallest diameter point of the hose 34 can be adjusted; when the water flow speed becomes faster, it will create resistance to the upward movement of the bubbles, thereby reducing the speed of the bubbles' upward movement, and even carrying the bubbles downward, causing the bubbles to stagnate at the smallest diameter point of the hose 34, thereby extending the contact time and increasing the oxygen content in the wastewater.

[0036] like Figure 2 As shown, the throat clamp 35 is arranged at the center of the hose 34, so that the hose 34 is subjected to a balanced force, and its reaction force on the throat clamp 35 is also balanced, which can improve the position stability of the throat clamp 35. At the same time, the air bubbles are also retained at a position at the same height as the throat clamp 35.

[0037] A foam collection channel 303 is connected to the top end of the top pipe 36. A screen 39 is installed within the foam collection channel 303. The screen 39 is positioned below the top of the inner wall of the diversion trough 2, allowing the screen 39 to be immersed in the wastewater within the flotation chamber 301 as the wastewater flows from the diversion trough 2 to the flotation chamber 301. This arrangement allows particles adsorbed by bubbles to accumulate on the screen 39, making it easier to scrape and clean. The screen 39 also prevents external particles from entering the flotation chamber 301.

[0038] The top of the foam collection channel 303 serves as an overflow port 31, through which excess gas escapes. The top of the foam collection channel 303 is flush with the top of the diversion trough 2, preventing wastewater from escaping through the overflow port 31. In other embodiments, the top of the foam collection channel 303 may be higher than the top of the diversion trough 2.

[0039] The chemical tank 4 is arranged horizontally, with a chemical tank inlet 41 on its left side, which is connected to the air flotation column outlet 33 through a water pump 6, thereby driving the wastewater from the air flotation column 3 to the chemical tank 4. A chemical tank outlet 42 is provided at the upper end of the right side of the chemical tank 4.

[0040] The chemical tank 4 is filled with a granular catalyst 43. The catalyst 43 is a material that catalyzes oxygen to produce free radicals, such as transition metal oxides such as copper, iron, and manganese, which decomposes large molecular organic matter into small molecular organic matter, and the small molecular organic matter is also oxidized in stages.

[0041] A chemical tank filter 44 is installed at both the chemical tank inlet 41 and the chemical tank outlet 42 . The mesh diameter of the chemical tank filter 44 is smaller than the particle size of the catalyst 43 , so as to improve the position stability of the catalyst 43 .

[0042] The outlet of the aeration head 38 is located above the chemical tank inlet 41, which can prevent air bubbles from being drawn into the water pump 6 and affecting the removal efficiency of particulate matter in the wastewater.

[0043] A transition chamber 302 extends from the air flotation column outlet 33 toward the chemical tank 4 and communicates with the air flotation chamber 301. The transition chamber 302 is located below the outlet of the aeration head 38, and the air flotation column outlet 33 is aligned with the outer wall of the transition chamber 302. This arrangement extends the distance between the air flotation column outlet 33 and the outlet of the aeration head 38, further preventing bubbles from being drawn into the air by the water pump 6.

[0044] A guide groove partition is provided in the guide groove 2 , so that an independent reflux chamber 24 is formed at the lower end of the guide groove 2 .

[0045] The lower end of the biological chamber 5 is provided with a biological chamber inlet 52, which is in communication with the chemical tank outlet 42. The upper end of the biological chamber 5 is connected to a drain outlet 53 in communication therewith for discharging the treated wastewater.

[0046] Bio-cavity 5 is filled with filler 51, which can be a three-dimensional elastic filler, a porous suspended sphere filler, or an active biological filler. These fillers are used for microbial growth and organic matter degradation. The elastic filler and active biological filler are suspended within bio-cavity 5, while the porous suspended sphere filler is accumulated within the bio-cavity 5.

[0047] The upper end of the biological chamber 5 is also connected to the reflux chamber 24, so that part of the wastewater flows into the flotation chamber 301 through the reflux chamber 24, making the entire wastewater treatment process a continuous circulation process, avoiding the escape of dissolved oxygen and the waste of catalytically active substances, and can effectively increase the degradation rate, thereby reducing the size of the equipment.

[0048] The drain port 53 is located higher than the filler 51 , allowing wastewater to flow through the entire microbial area, thereby improving the degradation efficiency of organic matter.

[0049] Since biological degradation takes a long time, the diameter of the air flotation column 3 is smaller than the diameter of the biological chamber 5, so that the wastewater stays in the biological chamber 5 for a longer time, thereby improving the degradation efficiency.

[0050] The beneficial effects of the present invention are as follows: 1. The device has a high degree of integration, and flotation, oxidation and biodegradation are integrated in the shell 1, and a ring structure is formed, which is simple in structure and greatly reduces the cost; 2. The device can be made into a mobile type, which is convenient for movement and use in the treatment of wastewater produced by different chemical products; 3. The device can be used in parallel in multiple ways to adapt to the requirements of treating different water volumes; 4. The device can be factory-produced, and the filler 51 biological film can be prepared in advance, saving the biodegradation startup time and saving time for the production of petrochemical production; 5. The device can extend the residence time of bubbles by adjusting the pipe diameter, and the air used for flotation and slag removal can be used as a buffer layer. The gas is fully utilized, the mass transfer time and the gas-solid contact time are extended, the particulate matter can fully contact and adhere to the bubbles, making the particulate matter easier to remove, and at the same time dissolving more oxygen into the wastewater to be treated; 6. The wastewater containing dissolved oxygen reacts directly under the action of the catalyst 43, so that the organic matter in the wastewater can be directly degraded or partially degraded, from large molecules to small molecules, and from difficult biodegradable substances to easily biodegradable substances, which can be degraded after the action of microorganisms; the setting of the reflux chamber 24 makes the whole process a continuous circulation process, avoiding the escape of dissolved oxygen and the waste of catalytic active substances, which can effectively increase the degradation rate, thereby reducing the size of the equipment.

[0051] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A petrochemical wastewater treatment device, characterized by: It comprises a shell (1) and an air flotation column (3) having an air flotation cavity (301), wherein a guide groove (2), a chemical groove (4) and a biological cavity (5) are provided in the shell (1); A guide trough inlet (21) and a guide trough outlet (22) are respectively provided at both ends of the guide trough (2), and wastewater is input from the guide trough inlet (21); The top of the air flotation column (3) is provided with an overflow port (31), and the side of the upper end is provided with an air flotation column inlet (32) which is in communication with the guide groove outlet (22); the side of the lower end of the air flotation column (3) is provided with an air flotation column outlet (33); The air flotation column (3) is provided with a bubble retention device for extending the retention time of bubbles inside, and the bubble retention device comprises an elastic hose (34) provided on the air flotation column (3) and an adjustment component on the hose (34) for adjusting the diameter of the hose (34); A bubble generating device is provided at the lower end of the air flotation column (3), the outlet of which is located below the hose (34), and is used to fill air into the air flotation cavity (301) to form bubbles; A chemical tank inlet (41) is provided at one end of the chemical tank (4), which is in communication with the air flotation column outlet (33); a chemical tank outlet (42) is provided on the upper side of the other end of the chemical tank (4); and the chemical tank (4) is filled with a granular catalyst (43) for decomposing organic matter. A water pump (6) is further connected between the chemical tank (4) and the air flotation column (3) for driving wastewater from the air flotation column (3) to flow into the chemical tank (4); A filler (51) for microbial growth is provided in the biological cavity (5); The lower end of the biological chamber (5) is provided with a biological chamber inlet (52) which is in communication with the chemical tank outlet (42); the upper end of the biological chamber (5) is provided with a drainage outlet (53) in communication with the chemical tank outlet (42); The upper and lower ends of the hose (34) are respectively connected to a hard top tube (36) and a bottom tube (37); The overflow port (31) is provided at the upper end of the top pipe (36), and the air flotation column inlet (32) is located at the side of the top pipe (36); The air flotation column outlet (33) is located on the side of the bottom tube (37), and the bubble generating device is installed on the bottom tube (37); The guide groove (2) is also provided with a reflux chamber (24), the two ends of which are respectively communicated with the top pipe (36) and the upper end of the biological chamber (5).

2. A petrochemical wastewater treatment device according to claim 1, characterized in that: The bubble generating device comprises an aeration head (38) connected to the outlet of the aerator via a pipeline.

3. A petrochemical wastewater treatment device according to claim 1, characterized in that: The drain port (53) is located above the filler (51).

4. A petrochemical wastewater treatment device according to claim 1, characterized in that: The outlet of the bubble generating device is located above the chemical tank inlet (41).

5. A petrochemical wastewater treatment device according to claim 4, characterized in that: A transition chamber (302) communicating with the air flotation chamber (301) extends from the air flotation column outlet (33) toward the chemical tank (4), and the transition chamber (302) is located below the outlet of the bubble generating device.

6. The petrochemical wastewater treatment device according to claim 1, characterized in that: The diameter of the air flotation column (3) is smaller than the diameter of the biological chamber (5).

7. The petrochemical wastewater treatment device according to claim 1, characterized in that: A foam collecting channel (303) extends downward from the top of the top pipe (36); the lower end of the foam collecting channel (303) is communicated with the upper end of the top pipe (36) and is provided with a screen (39); The position of the screen (39) is set so that when the wastewater flows from the guide trough (2) to the flotation chamber (301), the screen (39) is immersed in the wastewater in the flotation chamber (301).

8. The petrochemical wastewater treatment device according to claim 1, characterized in that: Before the diameter of the hose (34) is adjusted, its diameter is consistent with that of the top pipe (36) and the bottom pipe (37); when the diameter of the hose (34) is adjusted, its diameter is smaller than that of the top pipe (36).

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