A process and device for treating wastewater from petrochemical production

Abstract

The present invention discloses a treatment process and device for wastewater produced in petrochemical industry, including a main body component, including a chain; a tooth rake component, which is arranged on the main body component, including a fixed column, a fixed sleeve, a first torsion spring, a stopper, a fixed block and a tooth rake, wherein the fixed column is fixed on the chain, the fixed sleeve is arranged on the outside of the fixed column, the two ends of the first torsion spring are respectively fixed to the fixed column and the fixed sleeve, the stopper is fixed to one side of the fixed column, the fixed block is fixed in the fixed sleeve, and the tooth rake is fixed on the outside of the fixed sleeve. The beneficial effect of the present invention is that when a large amount of debris is entangled on the tooth rake, causing its load to increase, the cleaning component will approach the tooth rake, and as the tooth rake moves, the debris entangled by the tooth rake is cleaned by the cleaning component, thereby reducing the load of the tooth rake and avoiding the situation where the effective working area of ​​the rake teeth is reduced.

Description

Technical Field

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

[0002] Wastewater treatment refers to the purification and treatment of wastewater generated in the petrochemical production process through a series of physical, chemical and biological methods and processes to reduce the concentration of pollutants in the wastewater, so that it meets the national or local emission standards, or can meet the reuse requirements, thereby reducing pollution to the environment and realizing the recycling and sustainable development of water resources. In the process of wastewater treatment, it is necessary to remove large particles of impurities in the wastewater through the screen. When the rotary screen intercepts impurities, it will clean the intercepted impurities through the tooth rake to avoid clogging of the screen. There are some strip-shaped objects or flocculent impurities in the intercepted impurities. These impurities will be entangled on the tooth rake. When the tooth rake flips over to dump the impurities, such impurities cannot be dumped, and then such debris will continue to entangle on the outside of the tooth rake. The entangled debris will reduce the effective working area of ​​the rake teeth, reducing the ability to intercept and clean debris. In addition, due to the increase in the rake tooth load, the motor driving the screen machine needs to consume more energy. Summary of the invention

[0003] In view of the problems existing in the above-mentioned existing processes and devices for treating wastewater from petrochemical production, the present invention is proposed.

[0004] Therefore, the problem to be solved by the present invention is that it is inconvenient for the tooth rake to clean the impurities.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a treatment device for petrochemical production wastewater, comprising a main body component, including a chain;

[0006] A tooth rake assembly is arranged on the main body assembly, comprising a fixed column, a fixed sleeve, a first torsion spring, a stopper, a fixed block and a tooth rake, wherein the fixed column is fixed on the chain, the fixed sleeve is arranged on the outside of the fixed column, the two ends of the first torsion spring are respectively fixed to the fixed column and the fixed sleeve, the stopper is fixed to one side of the fixed column, the fixed block is fixed in the fixed sleeve, and the tooth rake is fixed to the outside of the fixed sleeve;

[0007] The cleaning component is arranged in the main body component and comprises a movable plate, a cleaning rod, a guide rail, a fixing rod and a guide shaft.

[0008] As a preferred solution of the treatment device for petrochemical production wastewater described in the present invention, wherein: the movable plate is located on one side of the chain, the cleaning rod is fixed on one side of the movable plate, the guide rail is located on one side of the movable plate, the fixed rod is fixed on the top of the movable plate, the guide shaft is fixed on one side of the fixed rod, a slide groove is provided on the guide rail, the guide shaft slides in the slide groove, a guide groove is provided on the guide rail, the guide groove is connected with the slide groove, the guide groove is inclined, and the slide groove is U-shaped; a fixed frame is fixed on the top of the fixed rod, a first support block is arranged on one side of the fixed frame, a first spring is fixed on one side of the first support block, a second support block is fixed on one end of the first spring, a connecting block is fixed on one side of the first support block, and a stabilizing bar is fixed on one side of the fixed frame.

[0009] As a preferred solution of the device for treating petrochemical production wastewater described in the present invention, a support rod is movably connected in the fixed frame, a movable groove is provided in the support rod, a limiting column is arranged in the movable groove, a second spring is fixed at one end of the limiting column, a limiting hole is provided on the fixed frame, and the limiting column is engaged with the limiting hole.

[0010] As a preferred solution of the device for treating petrochemical production wastewater described in the present invention, a push rod is movably connected inside the support rod, an extrusion rod is provided at one end of the push rod, an extrusion block is fixed to the outside of the fixed sleeve, a force groove corresponding to the push rod is opened on the limit column, and the extrusion block is in an inclined state.

[0011] As a preferred solution of the device for treating petrochemical production wastewater of the present invention, a groove is provided on the guide rail, a stabilizing column is fixed in the groove, and a baffle is rotatably connected to the outer side of the stabilizing column.

[0012] As a preferred solution of the device for treating petrochemical production wastewater of the present invention, a second torsion spring is sleeved on the outer side of the stabilizing column, and two ends of the second torsion spring are respectively fixed to the stabilizing column and the baffle.

[0013] As a preferred solution of the device for treating petrochemical production wastewater described in the present invention, a mounting block is fixed on one side of the extrusion rod, a third spring is fixed on the top of the mounting block, and the top of the third spring is fixed to the support rod.

[0014] As a preferred solution of the device for treating petrochemical production wastewater described in the present invention, the main body component also includes a shell, a grille, a sprocket and a driving mechanism, the shell is located outside the tooth rake assembly, the grille is arranged inside the shell, the sprocket is connected to the chain, and the driving mechanism is arranged on one side of the shell.

[0015] As a preferred solution of the device for treating petrochemical production wastewater of the present invention, a positioning bar is fixed in the shell, and the positioning bar is in contact with the outer side of the chain.

[0016] As a preferred solution of the process for treating petrochemical production wastewater of the present invention, the pretreatment step is to remove large particle impurities in the wastewater through a grid;

[0017] The homogenization and equalization step in the regulating tank regulates the amount and quality of wastewater to reduce the impact of water quality fluctuations on subsequent treatment processes;

[0018] The flotation treatment step uses an air flotation device to remove emulsified oil, suspended matter and some organic matter in the wastewater;

[0019] Biochemical treatment step, using activated sludge method or biofilm method to biodegrade wastewater and reduce chemical oxygen demand (COD) and biochemical oxygen demand (BOD) in wastewater;

[0020] In the advanced treatment step, residual pollutants in the wastewater are further removed through membrane filtration or activated carbon adsorption, so that the treated wastewater meets the discharge standards.

[0021] The beneficial effect of the present invention is that when a large amount of debris is entangled on the tooth rake, causing its load to increase, the cleaning component will approach the tooth rake, and as the tooth rake moves, the debris entangled by the tooth rake is cleaned by the cleaning component, thereby reducing the load of the tooth rake and avoiding a reduction in the effective working area of ​​the rake teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0023] Figure 1 This is an overall diagram of the treatment process and equipment used for petrochemical production wastewater.

[0024] Figure 2 This is a cross-sectional structural diagram of the shell of a process and device for treating wastewater in petrochemical production.

[0025] Figure 3 This is a structural diagram of the cleaning components of the treatment process and equipment used for petrochemical production wastewater.

[0026] Figure 4 This is a guide rail structure diagram for the treatment process and equipment used for petrochemical production wastewater.

[0027] Figure 5 Process and device for treating wastewater from petrochemical production Figure 4 A partial enlarged structural diagram in the middle.

[0028] Figure 6 Process and device for treating wastewater from petrochemical production Figure 4 A partial enlarged structural diagram of point B in the middle.

[0029] Figure 7 It is a fixed frame cross-sectional structural diagram of the treatment process and device for petrochemical production wastewater.

[0030] Figure 8 It is a partial cross-sectional structural diagram of the support rods of the process and device for treating wastewater in petrochemical production.

[0031] Fig. 9 The present invention is a partial structural diagram of the tooth rake assembly of the process and device for treating wastewater in petrochemical production. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Example 1

[0035] Reference Figure 1-Figure 9 , which is the first embodiment of the present invention, and provides a process and device for treating wastewater produced by petrochemical industry. The process and device for treating wastewater produced by petrochemical industry include a main body component 100, including a chain 101.

[0036] The chain 101 is used to drive the tooth rake assembly 200 to move.

[0037] The tooth rake assembly 200 is arranged on the main body assembly 100, and includes a fixed column 201a, a fixed sleeve 201b, a first torsion spring 201c, a stopper 201d, a fixed block 201e and a tooth rake 201. The fixed column 201a is fixed on the chain 101, the fixed sleeve 201b is sleeved on the outside of the fixed column 201a, the two ends of the first torsion spring 201c are respectively fixed to the fixed column 201a and the fixed sleeve 201b, the stopper 201d is fixed to one side of the fixed column 201a, the fixed block 201e is fixed in the fixed sleeve 201b, and the tooth rake 201 is fixed to the outside of the fixed sleeve 201b.

[0038] There are multiple groups of tooth rake assemblies 200, which are evenly distributed on the chain 101. The fixed sleeve 201b is rotatably connected to the outer side of the fixed column 201a through a bearing. When the tooth rake 201 contacts the grille 103 and drives the debris on the grille 103 to move upward, the fixed sleeve 201b and the tooth rake 201 are supported by the first torsion spring 201c so that the two will not tilt downward due to the weight of the debris.

[0039] When a lot of debris is entangled on the tooth rake 201 during long-term use, when the tooth rake 201 drives the debris on the grille 103 to move upward, the accumulation of various debris will offset the elasticity of the first torsion spring 201c to press the tooth rake 201 downward and cause the fixing sleeve 201b to rotate.

[0040] When the fixing sleeve 201b rotates to a certain angle, it will drive the fixing block 201e to contact the stopper 201d. At this time, the fixing sleeve 201b is restricted and stops rotating, so as to avoid the tooth rake 201 from tilting downward too much.

[0041] The cleaning assembly 300 is arranged in the main assembly 100, and includes a movable plate 301a, a cleaning rod 301b, a guide rail 301c, a fixed rod 301d and a guide shaft 301e. The movable plate 301a is located on one side of the chain 101, the cleaning rod 301b is fixed on one side of the movable plate 301a, the guide rail 301c is located on one side of the movable plate 301a, the fixed rod 301d is fixed on the top of the movable plate 301a, and the guide shaft 301e is fixed on one side of the fixed rod 301d. A slide groove 301c-1 is provided on the guide rail 301c, and the guide shaft 301e slides in the slide groove 301c-1. A guide groove 301c-2 is provided on the guide rail 301c, and the guide groove 301c-2 is connected to the slide groove 301c-1, the guide groove 301c-2 is inclined, and the slide groove 301c-1 is U-shaped.

[0042] The number of cleaning rods 301b corresponds to that of the tooth rake 201. In the cleaning assembly 300, except for the movable plate 301a and the cleaning rods 301b, the other structures have two groups, which are respectively located on both sides of the movable plate 301a.

[0043] When there are too many debris wrapped around the tooth rake 201 and it tilts downward due to gravity, the movable plate 301a will drive the cleaning rod 301b to move and contact the tooth rake 201, so that the cleaning rod 301b is inserted into the gap of the tooth rake 201. When the tooth rake 201 moves, it will push the movable plate 301a to move in the opposite direction. When the movable plate 301a moves in the opposite direction, it will drive the guide shaft 301e to move into the guide groove 301c-2. Through the cooperation of the two, the movable plate 301a can move downward while moving, and drive the cleaning rod 301b to move downward in the gap of the tooth rake 201. When the cleaning rod 301b moves, the debris wrapped around the tooth rake 201 can be pushed downward, so that the tooth rake 201 can be cleaned, thereby reducing the load of the tooth rake and avoiding the reduction of the effective working area of ​​the tooth rake 201.

[0044] When the cleaning rod 301b finishes cleaning the tooth rake 201, the tooth rake 201 will push the movable plate 301a to move to the initial position.

[0045] Example 2

[0046] Reference Figure 1-Figure 9 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0047] Specifically, a fixed frame 302a is fixed to the top of the fixed rod 301d, a first support block 302b is provided on one side of the fixed frame 302a, a first spring 302c is fixed to one side of the first support block 302b, a second support block 302d is fixed to one end of the first spring 302c, a connecting block 302e is fixed to one side of the first support block 302b, and a stabilizing bar 302f is fixed to one side of the fixed frame 302a.

[0048] The second support block 302d is fixed to the top of the support rod 304a, a stabilizing groove is provided on the connecting block 302e, and the stabilizing bar 302f is movably connected to the stabilizing groove, and the two cooperate to connect the first support block 302b to the fixed frame 302a, and can move up and down on one side of the fixed frame 302a.

[0049] The first spring 302c applies a pulling force to the first supporting block 302b, and the first supporting block 302b drives the fixed frame 302a to move, so that the fixed frame 302a drives the movable plate 301a to move.

[0050] A stabilizing rod is fixed on the top of the fixed rod 301d, and the stabilizing rod is L-shaped. A fourth spring is fixed at the bottom of the stabilizing rod, and the bottom end of the fourth spring is in contact with the guide rail 301c. When the movable plate 301a moves to the initial position, the fourth spring will exert an upward thrust on the stabilizing rod, and drive the fixed frame 302a and the movable plate 301a to move upward through the stabilizing rod, so that the movable plate 301a can be reset.

[0051] Specifically, a support rod 304a is movably connected in the fixed frame 302a, a movable groove 304a-1 is provided in the support rod 304a, a limiting column 304b is provided in the movable groove 304a-1, a second spring 304c is fixed to one end of the limiting column 304b, a limiting hole 302a-1 is provided on the fixed frame 302a, and the limiting column 304b is engaged with the limiting hole 302a-1.

[0052] When the limiting column 304b is engaged with the limiting hole 302a-1, the fixed frame 302a and the movable plate 301a can be locked through the cooperation of the two, so as to avoid the situation that the movable plate 301a moves toward the tooth rake 201 under normal conditions. The second spring 304c is used to apply a thrust to the limiting column 304b, so that the limiting column 304b and the limiting hole 302a-1 are engaged more tightly.

[0053] Specifically, a push rod 305a is movably connected inside the support rod 304a, an extrusion rod 305b is provided at one end of the push rod 305a, an extrusion block 305c is fixed to the outside of the fixed sleeve 201b, a force groove 304b-1 corresponding to the push rod 305a is opened on the limiting column 304b, and the extrusion block 305c is in an inclined state.

[0054] When the extrusion block 305c is in an inclined state, the extrusion block 305c will not contact the bottom end of the extrusion rod 305b when it moves upward. When the fixed sleeve 201b drives the extrusion block 305c to rotate and rotates the extrusion block 305c to a horizontal state, the extrusion block 305c will contact the bottom end of the extrusion rod 305b when it moves upward, and push the extrusion rod 305b to move upward, so that the extrusion rod 305b squeezes the inclined surface of the push rod 305a, and pushes the push rod 305a to move, and squeezes the inclined surface of the inner wall of the force groove 304b-1 through the push rod 305a. The cooperation of the two can drive the limit column 304b to move, and separate the limit column 304b from the limit hole 302a-1, thereby releasing the restriction on the movable plate 301a.

[0055] Specifically, a groove 301c-3 is formed on the guide rail 301c, a stabilizing column 306a is fixed in the groove 301c-3, and a baffle 306b is rotatably connected to the outer side of the stabilizing column 306a.

[0056] When the guide shaft 301e is about to move to the end in the slide groove 301c-1, it will contact the baffle 306b and push the baffle 306b to rotate into the groove 301c-3, so it will not hinder the movement of the guide shaft 301e. When the guide shaft 301e moves to the inner end of the slide groove 301c-1, the second torsion spring 306c will apply a downward torsional force to the baffle 306b and reset the baffle 306b. When the guide shaft 301e moves in the reverse direction, it will be hindered by the baffle 306b and cannot move in the reverse direction in the slide groove 301c-1, and can only move into the guide groove 301c-2.

[0057] Specifically, a second torsion spring 306c is sleeved on the outer side of the stabilizing column 306a, and two ends of the second torsion spring 306c are respectively fixed to the stabilizing column 306a and the baffle 306b.

[0058] Example 3

[0059] Reference Figure 1-Figure 9 , which is the third embodiment of the present invention, and is based on the first two embodiments.

[0060] Specifically, a mounting block 307a is fixed to one side of the extrusion rod 305b, a third spring 307b is fixed to the top of the mounting block 307a, and a top end of the third spring 307b is fixed to the support rod 304a.

[0061] The third spring 307b is used to support the extrusion rod 305b and reset it.

[0062] Specifically, the main body component 100 also includes a shell 102, a grille 103, a sprocket 104 and a driving mechanism 105. The shell 102 is located outside the tooth rake assembly 200, the grille 103 is arranged in the shell 102, the sprocket 104 is connected to the chain 101, and the driving mechanism 105 is arranged on one side of the shell 102.

[0063] The grille 103 is used to intercept impurities in the wastewater, the sprocket 104 is used to drive the chain 101 to move, and the driving mechanism 105 is used to drive the sprocket 104 to rotate. This is the prior art and will not be elaborated in detail in this solution. Those skilled in the art can clearly understand the working principle.

[0064] Specifically, a positioning bar 106 is fixed inside the housing 102 , and the positioning bar 106 is in contact with the outer side of the chain 101 .

[0065] The positioning bar 106 is arc-shaped and is used to position and guide the upper part of the chain 101 .

[0066] Specifically, in the pretreatment step, large particles of impurities in the wastewater are removed through the grid 103;

[0067] The homogenization and equalization step in the regulating tank regulates the amount and quality of wastewater to reduce the impact of water quality fluctuations on subsequent treatment processes;

[0068] The flotation treatment step uses an air flotation device to remove emulsified oil, suspended matter and some organic matter in the wastewater;

[0069] Biochemical treatment step, using activated sludge method or biofilm method to biodegrade wastewater and reduce chemical oxygen demand (COD) and biochemical oxygen demand (BOD) in wastewater;

[0070] In the advanced treatment step, residual pollutants in the wastewater are further removed through membrane filtration or activated carbon adsorption, so that the treated wastewater meets the discharge standards.

[0071] During use, when a large amount of debris is entangled on the tooth rake 201 during long-term use, when the tooth rake 201 drives the debris on the grille 103 to move upward, the accumulation of various debris will offset the elasticity of the first torsion spring 201c to press the tooth rake 201 downward and cause the fixing sleeve 201b to rotate. At this time, the fixing sleeve 201b will drive the extrusion block 305c to rotate to a horizontal state. When the extrusion block 305c moves upward, it will contact the bottom end of the extrusion rod 305b and push the extrusion rod 305b to move upward, so that the extrusion rod 305b squeezes the inclined surface of the push rod 305a, and pushes the push rod 305a to move, and the push rod 305a squeezes the inclined surface of the inner wall of the force groove 304b-1, and the cooperation of the two can drive the limit column 304b to move, and the limit column 304b is separated from the limit hole 302a-1, thereby releasing the restriction on the movable plate 301a.

[0072] The first spring 302c applies a pulling force to the first support block 302b, and the first support block 302b drives the fixed frame 302a to move, so that the fixed frame 302a drives the movable plate 301a to move. At this time, the movable plate 301a drives the cleaning rod 301b to move and contact with the tooth rake 201, so that the cleaning rod 301b is inserted into the gap of the tooth rake 201. When the tooth rake 201 is moving, it will push the movable plate 301a to move in the opposite direction. When the movable plate 301a moves in the opposite direction, it will drive the guide shaft 301e to move into the guide groove 301c-2. Through the cooperation of the two, the movable plate 301a can move downward while moving, and drive the cleaning rod 301b to move downward in the gap of the tooth rake 201. When the cleaning rod 301b is moving, the debris wrapped on the tooth rake 201 can be pushed downward, so that the tooth rake 201 can be cleaned, thereby reducing the load of the tooth rake and avoiding the situation that the effective working area of ​​the tooth rake 201 is reduced.

[0073] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A treatment device for petrochemical production wastewater, characterized in that: include, A main assembly (100) comprising a chain (101); A tooth rake assembly (200) is arranged on the main body assembly (100), comprising a fixed column (201a), a fixed sleeve (201b), a first torsion spring (201c), a stopper (201d), a fixed block (201e) and a tooth rake (201), wherein the fixed column (201a) is fixed on the chain (101), the fixed sleeve (201b) is sleeved on the outside of the fixed column (201a), two ends of the first torsion spring (201c) are respectively fixed to the fixed column (201a) and the fixed sleeve (201b), the stopper (201d) is fixed to one side of the fixed column (201a), the fixed block (201e) is fixed in the fixed sleeve (201b), and the tooth rake (201) is fixed to the outside of the fixed sleeve (201b); A cleaning assembly (300) is arranged in the main assembly (100), comprising a movable plate (301a), a cleaning rod (301b), a guide rail (301c), a fixing rod (301d) and a guide shaft (301e); The movable plate (301a) is located on one side of the chain (101), the cleaning rod (301b) is fixed on one side of the movable plate (301a), the guide rail (301c) is located on one side of the movable plate (301a), the fixed rod (301d) is fixed on the top of the movable plate (301a), the guide shaft (301e) is fixed on one side of the fixed rod (301d), a slide groove (301c-1) is provided on the guide rail (301c), the guide shaft (301e) slides in the slide groove (301c-1), a guide groove (301c-2) is provided on the guide rail (301c), the guide groove (301c-2) is connected to the slide groove (301c-1), the guide groove (301c-2) is inclined, and the slide groove (301c-1) is U-shaped; A fixing frame (302a) is fixed to the top of the fixing rod (301d); a first support block (302b) is provided on one side of the fixing frame (302a); a first spring (302c) is fixed to one side of the first support block (302b); a second support block (302d) is fixed to one end of the first spring (302c); a connecting block (302e) is fixed to one side of the first support block (302b); and a stabilizing bar (302f) is fixed to one side of the fixing frame (302a); A support rod (304a) is movably connected in the fixed frame (302a), a movable groove (304a-1) is provided in the support rod (304a), a limiting column (304b) is provided in the movable groove (304a-1), a second spring (304c) is fixed to one end of the limiting column (304b), a limiting hole (302a-1) is provided on the fixed frame (302a), and the limiting column (304b) is engaged with the limiting hole (302a-1); A push rod (305a) is movably connected inside the support rod (304a), an extrusion rod (305b) is provided at one end of the push rod (305a), an extrusion block (305c) is fixed outside the fixed sleeve (201b), a force-bearing groove (304b-1) corresponding to the push rod (305a) is provided on the limiting column (304b), and the extrusion block (305c) is in an inclined state; When the fixing sleeve (201b) drives the extrusion block (305c) to rotate and causes the extrusion block (305c) to rotate to a horizontal state, the extrusion block (305c) will contact the bottom end of the extrusion rod (305b) when moving upward, and push the extrusion rod (305b) to move upward.

2. The device for treating petrochemical wastewater according to claim 1, characterized in that: The guide rail (301c) is provided with a groove (301c-3), a stabilizing column (306a) is fixed in the groove (301c-3), and a baffle (306b) is rotatably connected to the outside of the stabilizing column (306a).

3. The treatment device for petrochemical production wastewater according to claim 2, characterized in that: A second torsion spring (306c) is sleeved on the outside of the stabilizing column (306a), and two ends of the second torsion spring (306c) are respectively fixed to the stabilizing column (306a) and the baffle (306b).

4. The treatment device for petrochemical production wastewater according to claim 3, characterized in that: A mounting block (307a) is fixed to one side of the extrusion rod (305b), a third spring (307b) is fixed to the top of the mounting block (307a), and the top end of the third spring (307b) is fixed to the support rod (304a).

5. The device for treating petrochemical wastewater according to claim 4, characterized in that: The main body component (100) further comprises a shell (102), a grille (103), a sprocket (104) and a driving mechanism (105); the shell (102) is located outside the tooth rake component (200); the grille (103) is arranged inside the shell (102); the sprocket (104) is connected to the chain (101); and the driving mechanism (105) is arranged on one side of the shell (102).

6. The device for treating petrochemical wastewater according to claim 5, characterized in that: A positioning bar (106) is fixed inside the housing (102), and the positioning bar (106) is in contact with the outer side of the chain (101).

7. A process for treating wastewater from petrochemical production, characterized in that: Using the processing device as described in any one of claims 1 to 6, the processing process includes: A pre-treatment step, wherein large particles of impurities in the wastewater are removed by a screen (103); The homogenization and equalization step in the regulating tank regulates the amount and quality of wastewater to reduce the impact of water quality fluctuations on subsequent treatment processes; The flotation treatment step uses an air flotation device to remove emulsified oil, suspended matter and some organic matter in the wastewater; Biochemical treatment step, using activated sludge method or biofilm method to biodegrade wastewater and reduce the chemical oxygen demand (COD) and biochemical oxygen demand (BOD) in wastewater; In the advanced treatment step, residual pollutants in the wastewater are further removed through membrane filtration or activated carbon adsorption, so that the treated wastewater meets the discharge standards.

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