Petrochemical wastewater treatment device

Abstract

The invention discloses a petrochemical wastewater treatment device, and belongs to the technical field of water pollution wastewater treatment. Comprising a first treatment tank, a pollution discharge assembly and a second treatment tank which are connected in sequence, and the first treatment tank is integrated with a self-cleaning primary filtering unit capable of rotating and switching and a stirring assembly with an improved structure. And the stirring assembly is integrated with filtering layers with different pore diameters on the stirring plate. The sewage discharging assembly is located between the first treatment tank and the second treatment tank, the core of the sewage discharging assembly is a piston type mechanism driven by a hydraulic cylinder, the piston type mechanism has the negative pressure suction function and the positive pressure pushing function, clear liquid in the first treatment tank can be rapidly and efficiently transferred to the second treatment tank in a low-disturbance mode, and concentrated sludge can be subjected to negative pressure suction, extrusion dewatering and concentrated discharging. The technical problems that a traditional pretreatment process flow is dispersed, the solid-liquid separation efficiency is low, and the separation effect is prone to being damaged in the material transfer process are solved, and high integration, automation and efficient and stable operation of the pretreatment process are achieved.

Description

Technical Field

[0001] This invention relates to the field of water pollution wastewater treatment technology, and in particular to a petrochemical wastewater treatment device. Background Technology

[0002] Petrochemical wastewater is complex in composition and highly toxic, making the efficiency and stability of its pretreatment stage crucial for subsequent processes. Currently, mainstream pretreatment processes typically involve arranging units such as bar screen filtration, flocculation reaction, and sedimentation separation in series, which has inherent drawbacks such as lengthy processes, large footprint, and low automation.

[0003] In the primary filtration unit, the fixed screen is easily clogged by oily sludge and impurities, requiring frequent shutdowns for cleaning, which affects continuous operation. In the flocculation treatment unit, the traditional reaction + sedimentation separation mode has obvious shortcomings: on the one hand, the formed flocs are easily broken by hydraulic shear during the transfer to the sedimentation tank; on the other hand, relying on gravity for natural sedimentation is inefficient, and the discharged sludge has an extremely high water content, which increases the load on subsequent treatment.

[0004] More importantly, after flocculation and separation are completed in the pretreatment tank, it is impossible to efficiently and with minimal disturbance transfer of the clarified liquid to the next treatment unit while avoiding backmixing of the deposited sludge. Relying on static pressure flow is slow and easily leads to damage to the separation interface; while using pumps will generate shear and agitate the sludge layer. Neither of these methods can guarantee the achieved separation effect while transferring the sludge quickly. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of dispersed pretreatment process, low solid-liquid separation efficiency, and easy back mixing during the transfer of clear and turbid fluids in the prior art, and to propose a petrochemical wastewater treatment device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A petrochemical wastewater treatment device includes a first treatment tank and a second treatment tank, and a sewage discharge assembly for water transfer between the two tanks is provided between the first treatment tank and the second treatment tank.

[0008] The first processing tank comprises, from top to bottom, a primary filtration section, a driving section, and a mixing section; the primary filtration section includes an upper shell and a primary filtration assembly; the mixing section includes a lower shell and a stirring assembly disposed therein; the stirring assembly includes a central bore cylinder and a first stirring plate, as well as a lifting shaft that can be raised and lowered through the central bore cylinder and a second stirring plate;

[0009] The second stirring plate has a solid baffle in the middle for sealing the flow channel, and filter layers with different pore sizes on its upper and lower sides for guiding the flocs to partition during the stirring process.

[0010] In some embodiments, the upper shell is provided with a water inlet pipe for water intake and a discharge port for impurity discharge;

[0011] The primary filtration assembly includes a ring plate, a rotating column, and filter layer units distributed on the rotating column. The filter layer units are used to trap large-particle impurities.

[0012] The ring plate includes a filtration zone with permeable holes and an inclined solid zone for guiding impurities.

[0013] The first stirring plate is equipped with a sensor for detecting turbidity.

[0014] In some embodiments, the first treatment tank and the second treatment tank are connected by a drain pipe, and the drain assembly is disposed in the middle of the drain pipe;

[0015] The sewage discharge assembly includes a collection tank, a drive source, and a squeezing plate and a pressing plate that can move within the tank. The squeezing plate is a filter plate used for water permeability and impurity interception.

[0016] In some embodiments, the bottom of the rotating column is provided with a limiting structure, which includes an electromagnetic limiting pin and a snap-fit ​​plate that cooperates with the rotating column and rotates synchronously, for accurately positioning the filter layer unit and the water inlet pipe.

[0017] In some embodiments, a water flow rate sensor is provided at the bottom of the filtration zone for monitoring its blockage status.

[0018] In some embodiments, the drive unit includes a drive motor and a cylinder, which are used to drive the rotation of the central cylinder and the lifting shaft to move up and down, respectively.

[0019] In some embodiments, the driving source of the sewage discharge assembly is a hydraulic cylinder, and the extrusion plate is elastically connected to the lower pressure plate by a spring; the inner wall of the collection tank is provided with a stop for limiting the downward movement of the extrusion plate.

[0020] In some embodiments, the two ends of the sewage pipe are respectively provided with an electromagnetic control valve and a check valve for independently controlling the connection state.

[0021] In some embodiments, the bottom of the second stirring plate at the bottom is a solid structure, which is adapted to fit the bottom slope of the lower shell to scrape off residual impurities.

[0022] In some embodiments, a control system is also included, which controls the operation of the drive motor, cylinder, hydraulic cylinder and valves based on sensor signals.

[0023] Compared with the prior art, the present invention provides a petrochemical wastewater treatment device with the following beneficial effects.

[0024] 1. This invention integrates primary filtration, reagent mixing, flocculation reaction, dynamic separation, and impurity collection and discharge into the first treatment tank and sludge discharge assembly, significantly simplifying the lengthy process of traditional multi-unit series connection. This reduces equipment footprint and greatly improves the automation level and operational continuity of the entire pretreatment unit. This highly integrated first-stage enhanced pretreatment design provides stable and high-quality influent conditions for subsequent multi-stage advanced treatment processes (such as biochemical and membrane treatment), optimizing the overall process chain's connection efficiency.

[0025] 2. This invention, by incorporating filter layers with different pore sizes within the stirring assembly, guides flocs towards the larger pore size side for directional enrichment during mixing, achieving simultaneous reaction and separation, thus breaking away from the traditional treatment model of mixing first and then settling. Combined with real-time feedback from a turbidity sensor, the separation endpoint can be determined, ensuring low turbidity of the discharged clear liquid. This guarantees clear and stable water quality entering the secondary treatment unit, effectively reducing the suspended solids load in subsequent multi-stage treatment processes and mitigating sludge production in the biological system or the risk of membrane system fouling.

[0026] 3. This invention utilizes a hydraulic cylinder, extrusion plate, and lower pressure plate in the sewage discharge assembly to form a piston pump structure. Through coordinated action with the valve on the sewage discharge pipe, it can quickly and smoothly transfer the clarified liquid in the first treatment tank to the second treatment tank. This method largely protects the already formed fragile solid-liquid interface, avoiding the turbulence damage and back-mixing problems caused by traditional pumping. This efficient and low-disturbance transfer mechanism ensures the accuracy and reliability of material transport between pretreatment and subsequent treatment units, which is a key guarantee for the stable and efficient collaborative operation of a multi-stage treatment system.

[0027] Other advantages, objectives and features of the invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be learned from practice of the invention. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the internal structure of the first processing tank of the present invention.

[0030] Figure 3 For the present invention Figure 2 A partial structural diagram.

[0031] Figure 4 This is a schematic diagram of the discharge port structure of the present invention.

[0032] Figure 5 For the present invention Figure 4 Enlarged structural diagram of area A in the middle.

[0033] Figure 6 This is a schematic diagram of the structure of the driving component of the present invention.

[0034] Figure 7 This is a schematic diagram of the stirring assembly of the present invention.

[0035] Figure 8 For the present invention Figure 7 A magnified structural diagram of region B in the middle.

[0036] Figure 9 This is a schematic diagram of the connection between the perforated cylinder and the lifting shaft in this invention.

[0037] Figure 10 This is a schematic diagram of the internal structure of the collection tank of the present invention.

[0038] Figure 11 This is a schematic diagram of the structure of the pressure plate of the present invention.

[0039] Figure 12 This is a schematic diagram of the structure of the first stirring plate and the second stirring plate of the present invention.

[0040] Figure 13 This is a schematic diagram of the structure of the second stirring plate of the present invention.

[0041] Figure 14 For the present invention Figure 13 A schematic diagram of a local part of the structure.

[0042] Figure 15 This is a schematic diagram of the connection between the ring plate and the rotating column of the present invention.

[0043] Figure 16 This is a schematic diagram of the electromagnetic limiting pin of the present invention.

[0044] In the picture:

[0045] 1. First processing tank; 101. Upper shell; 1011. Inlet pipe; 1012. Outlet; 102. Protective outer shell; 103. Lower shell; 2. Second processing tank; 3. Sewage discharge assembly; 301. Collection tank; 3011. Baffle; 302. Hydraulic cylinder; 303. Extrusion plate; 3031. Perforation; 304. Lower pressure plate; 3041. Lower pressure column; 3042. Spring; 4. Primary filter assembly; 401. Ring plate; 4011. Filtering zone; 4012. Solid zone; 402. Rotating column; 4 03. Filter layer unit; 5. Drive assembly; 501. Drive motor; 502. Drive gear; 503. Synchronous belt; 504. Driven gear; 505. Cylinder; 506. Lifting plate; 5061. Electromagnetic limit pin; 5062. Connecting shaft; 5063. Snap-fit ​​plate; 6. Stirring assembly; 601. Central bore cylinder; 6011. Movement gap; 602. First stirring plate; 603. Lifting shaft; 604. Second stirring plate; 6041. Solid baffle; 6042. Filter layer; 7. Drain pipe. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0047] Reference Figure 1 A petrochemical wastewater treatment device includes a first treatment tank 1, a second treatment tank 2, and a sewage discharge assembly 3. The first treatment tank 1 is a primary treatment unit used to achieve primary filtration, reagent mixing, and flocculation separation of wastewater. The second treatment tank 2 is a secondary treatment unit used to perform secondary treatment or deep purification on the water after primary treatment. The specific deep purification process can adopt existing mature processes such as adsorption treatment, but this is not the focus of this embodiment, so it will not be described in detail.

[0048] The sewage discharge assembly 3 is located in the middle of the sewage discharge pipe 7 between the first treatment tank 1 and the second treatment tank 2. It is used to collect flocculated impurities in the two treatment tanks and to achieve efficient water transfer between the two treatment tanks.

[0049] Please continue to refer to Figure 2 The first treatment tank 1 is fixedly assembled with a primary filter section, a drive section and a mixing section from top to bottom; the mixing section of the first treatment tank 1 is fixedly connected to the bottom of the second treatment tank 2 through a drain pipe 7, and the two ends of the drain pipe 7 are respectively equipped with an electromagnetic control valve and a check valve, which are used to independently control the communication status of the first treatment tank 1, the second treatment tank 2 and the drain assembly 3.

[0050] Please continue to refer to Figures 2 to 4Specifically, the primary filtration section includes an upper shell 101 and a primary filtration assembly 4. The upper shell 101 is a cylindrical shell structure, and an inlet pipe 1011 is welded and fixed to the upper part of one side. The water inlet direction of the inlet pipe 1011 is towards the primary filtration assembly 4, and a flow control valve is provided at the port of the inlet pipe 1011 to adjust the inlet pressure and flow rate.

[0051] The primary filtration assembly 4 includes a ring plate 401, a rotating column 402, and a filter layer unit 403. The ring plate 401 is an annular plate structure. The outer ring of the ring plate 401 is fixedly connected to the inner wall of the upper shell 101 by bolts. The ring plate 401 is divided into a filtration zone 4011 and a solid zone 4012. The filtration zone 4011 corresponds to the water inlet pipe 1011, and the solid zone 4012 corresponds to the discharge port 1012 of the upper shell 101. The filtration zone 4011 is horizontally arranged, and several water-permeable holes are opened on the surface of the filtration zone 4011 for the water to fall after primary filtration. The solid zone 4012 is arranged obliquely from the inside to the outside, which facilitates the sliding and accumulation of impurities towards the discharge port 1012.

[0052] The rotating column 402 is rotatably connected to the middle of the ring plate 401 via a bearing. The bottom of the rotating column 402 penetrates the ring plate 401 and is provided with a limit structure. For example, Figure 15 and Figure 16 As shown, the limiting structure includes an electromagnetic limiting pin 5061, the fixed end of which is fixedly connected to the lifting plate 506; a connecting shaft 5062 is rotatably connected to the lifting plate 506 and the rotating column 402 at the corresponding positions, the top end of the connecting shaft 5062 is fixedly connected to the bottom of the rotating column 402; the connecting shaft 5062 is provided with a snap-fit ​​plate 5063 in the circumferential direction that corresponds to and cooperates with the electromagnetic limiting pin 5061, the number of snap-fit ​​plates 5063 is equal to the number of filter layer units 403 and they correspond to each other; under normal conditions, the electromagnetic limiting pin 5061 extends, and the telescopic end of the electromagnetic limiting pin 5061 realizes the abutment and limiting of one side of the snap-fit ​​plate 5063, so that a single filter layer unit 403 is precisely aligned with the water inlet pipe 1011.

[0053] A water flow rate sensor is installed at the bottom of the filtration zone 4011. The water flow rate sensor detects the current blockage status of the filtration zone 4011. When the blockage of the filtration zone 4011 reaches the preset threshold of the water flow rate sensor, the electromagnetic limit pin 5061 is immediately de-energized and retracted, and then energized again and pushed out. Specifically, when the telescopic end of the electromagnetic limit pin 5061 is de-energized and retracted, the limit on one locking plate 5063 is released. At this time, the impact force of the water discharged into the upper shell 101 by the water inlet pipe 1011 on the blocked filter layer unit 403 causes the subsequent filter layer unit 403 with filtration capacity to rotate to the position corresponding to the water inlet pipe 1011. At the same time, the telescopic end of the electromagnetic limit pin 5061 is energized again and pushed out, limiting the subsequent locking plate 5063, keeping the filter layer unit 403 with filtration capacity above aligned with the water inlet pipe 1011.

[0054] Multiple filter layer units 403 are evenly distributed along the circumference of the rotating column 402. Each filter layer unit 403 is inclined. The filter layer unit 403 can be a stainless steel filter screen. Its edge is welded and fixed to the rotating column 402 and rotates around the center point of the rotating column 402.

[0055] Furthermore, the lower surface of the filter layer unit 403 is attached to the upper surface of the filter area 4011 of the ring plate 401, forming a gap that gradually increases from the inside to the outside with the upper surface of the solid area 4012.

[0056] like Figure 4 and Figure 5 As shown, a transparent sealing plate is detachably connected or detachably installed at the discharge port 1012 of the upper shell 101, for example, by means of a hinge. The sealing plate is made of tempered glass. The operator can observe the accumulation of large-diameter impurities in the solid area 4012 through the transparent sealing plate. When the impurities accumulate to a preset height, the electromagnetic lock is activated to open the sealing plate for impurity discharge.

[0057] Please continue reading. Figure 6 The drive unit includes a protective housing 102 and a drive assembly 5. The protective housing 102 is a shell structure with a semi-circular cross-section. Its top is welded and fixed to the bottom of the upper shell 101, and its bottom is welded and fixed to the top of the lower shell 103 of the mixing unit. The protective housing 102 corresponds to the solid area 4012 of the ring plate 401, which is used to avoid the falling path of impurities after primary filtration, while protecting the internal drive assembly 5.

[0058] The drive assembly 5 includes a drive motor 501, a drive gear 502, a timing belt 503, a driven gear 504, a cylinder 505, and a lifting plate 506. The drive motor 501 is a servo motor, and its fixed end is fixed to the top of the protective housing 102 through a motor bracket. The rotating end of the drive motor 501 is fixedly connected to the drive gear 502 through a flat key.

[0059] Driven gear 504 is rotatably connected to the mounting base at the bottom of protective housing 102 via bearing. Synchronous belt 503 is sleeved on the outer side of drive gear 502 and driven gear 504 to form a synchronous transmission structure. The middle part of driven gear 504 is fixedly connected to the central bore cylinder 601 of stirring assembly 6 via spline, so as to realize the rotation drive of stirring assembly 6 by drive motor 501.

[0060] The fixed end of the cylinder 505 is fixed to the bottom of the protective shell 102 through the cylinder bracket, and the telescopic end of the cylinder 505 is welded and fixed to the upper surface of the lifting plate 506. The lifting plate 506 is a rectangular plate structure, and its lower surface is welded and fixed to the top of the lifting shaft 603 of the stirring assembly 6. The lifting shaft 603 is driven to move up and down by the telescopic movement of the cylinder 505.

[0061] Please continue reading. Figure 2 and Figure 7 The mixing section includes a lower shell 103 and a stirring assembly 6. The lower shell 103 is a cylindrical shell structure, and its top is welded and fixed to the bottom of the protective shell 102. The lower shell 103 is provided with an extension at the corresponding position of the filter area 4011 of the ring plate 401. The extension covers the protective shell 102 and is welded and fixed to the upper shell 101 to ensure that all the water after primary filtration enters the lower shell 103.

[0062] The bottom of the lower shell 103 is an inwardly sloping surface. A drain pipe 7 is welded and fixed to the middle of the lower shell 103. The drain pipe 7 is connected to the interior of the lower shell 103 and is used for the discharge of water and impurities. An electromagnetic control valve and a check valve are respectively installed at both ends of the drain pipe 7; the electromagnetic control valve is located at the end of the drain pipe 7 closer to the lower shell 103, and the check valve is located at the end of the drain pipe 7 closer to the second treatment tank 2.

[0063] The inner wall of the lower shell 103 may be provided with a chemical addition port (not shown in the figure) for adding flocculants and other treatment agents to the wastewater.

[0064] Please continue reading. Figures 7 to 9 The stirring assembly 6 includes a central cylinder 601, a first stirring plate 602, a lifting shaft 603, and a second stirring plate 604. The central cylinder 601 is a hollow cylindrical structure, and its top is fixedly connected to the driven gear 504 via a spline. Two sets of first stirring plates 602 are welded to the outside of the central cylinder 601. The side of the first stirring plate 602 away from the central cylinder 601 is attached to the inside of the lower shell 103. The lower surface of the lowest first stirring plate 602 is inclined at an angle to the inner lower surface of the lower shell 103 to ensure that there are no impurities remaining at the bottom of the lower shell 103.

[0065] A lifting shaft 603 is movably inserted inside the central bore 601. A movable gap 6011 is formed between the central bore 601 and the first stirring plate 602, providing space for the lifting and lowering of the second stirring plate 604. The second stirring plate 604 is welded to the outer side of the lifting shaft 603 at a position corresponding to the movable gap 6011, and the outer side of the second stirring plate 604 is flush with the outer side of the first stirring plate 602. The outer sides of both the second stirring plate 604 and the first stirring plate 602 are close to the inner wall of the lower shell 103. The top of the lifting shaft 603 passes through the top of the central bore 601 and is rotatably connected to the lifting plate 506.

[0066] like Figures 12 to 14 As shown, the middle part of the second stirring plate 604 is a solid baffle 6041, which fits the gap between the upper and lower first stirring plates 602. Filter layers 6042 are fixedly connected to the upper and lower sides of the solid baffle 6041. The filter layers 6042 are made of polypropylene mesh. The filter layers 6042 on both sides of the central cylinder 601 have different pore sizes; one side has a small pore size, and the other side has a large pore size. The lowermost second stirring plate 604 only has a filter layer 6042 at the top; the bottom is a solid structure, fitting with the lowermost first stirring plate 602. Figure 13 As shown.

[0067] A turbidity sensor is embedded in the first stirring plate 602 to detect the turbidity of the water in different areas within the lower shell 103. The signal output terminal of the turbidity sensor is electrically connected to the control system of the device, which can be a PLC controller. This enables the coordinated control of the rotation and lifting of the stirring assembly 6.

[0068] like Figure 10 and Figure 11 As shown, the sewage discharge assembly 3 includes a collection tank 301, a hydraulic cylinder 302, a pressing plate 303, a lower pressure plate 304, and a stop block 3011. The collection tank 301 has a cylindrical tank structure, and its top is welded and fixed to the middle of the sewage discharge pipe 7. The bottom of the collection tank 301 is provided with a discharge port, and an electromagnetic ball valve can be installed at the discharge port for the centralized discharge of impurities. The lower layer of the collection tank 301 is the impurity accumulation area, and the upper layer is the flow area.

[0069] The hydraulic cylinder 302 is a single-acting hydraulic cylinder. Its fixed end is fixed to the top of the collection tank 301 through a flange. The telescopic end of the hydraulic cylinder 302 passes through the top of the collection tank 301 and is welded and fixed to the upper surface of the lower pressure plate 304. Several lower pressure columns 3041 are welded and fixed to the bottom of the lower pressure plate 304.

[0070] A spring 3042 is sleeved on the outside of the lower pressure column 3041. The two ends of the spring 3042 abut against the lower pressure plate 304 and the extrusion plate 303 respectively, so as to realize the elastic connection between the lower pressure plate 304 and the extrusion plate 303.

[0071] The squeezing plate 303 is adapted to the interior of the collection tank 301; the squeezing plate 303 and the lower pressure column 3041 are respectively provided with a through hole 3031, the diameter of the through hole 3031 is slightly larger than the diameter of the lower pressure column 3041, which provides a limit for the vertical movement of the lower pressure column 3041; the squeezing plate 303 is a water-permeable filter plate, which can allow water to pass through but intercept large-volume impurities; a stop block 3011 is welded and fixed on the inner side wall of the collection tank 301, the stop block 3011 is located below the connection between the sewage pipe 7 and the collection tank 301, and is used to limit the downward movement of the squeezing plate 303.

[0072] A turbidity sensor is embedded in the bottom of the extrusion plate 303 to detect the amount of impurities accumulated in the impurity accumulation area. Its signal output terminal is electrically connected to the control system to realize the linkage control of the extension and retraction of the hydraulic cylinder 302. In the initial state, the extrusion plate 303 is higher than the connection between the sewage pipe 7 and the collection tank 301.

[0073] In addition, preferably, the end of the drain pipe 7 near the second treatment tank 2 is flush with the water inlet of the second treatment tank 2, and a check valve is installed at the water inlet to prevent the water in the second treatment tank 2 from flowing back.

[0074] When using this invention, the flow control valve of the inlet pipe 1011 is first opened, and the petrochemical wastewater enters the upper shell 101 through the inlet pipe 1011, impacting the filter layer unit 403 of the primary filter component 4; after the wastewater is filtered by the filter layer unit 403, large-diameter impurities such as suspended particles and oil residue are intercepted, and the filtered water falls into the lower shell 103 through the water permeable holes of the filter area 4011 of the ring plate 401.

[0075] As filtration proceeds, impurities gradually accumulate on the filter layer unit 403. When the blockage in the filter zone 4011 reaches the preset threshold of the water flow rate sensor, the control system de-energizes and retracts the electromagnetic limit pin 5061 at the bottom of the rotating column 402, thus releasing the limit on the rotating column 402. The water pressure from the inlet pipe 1011 pushes the currently clogged filter layer unit 403 to move, causing the rotating column 402 to rotate, so that the next unclogged filter layer unit 403 rotates to the position corresponding to the inlet pipe 1011. At this time, the control system controls the extension end of the electromagnetic limit pin 5061 to be energized and extended, re-limiting and fixing the rotating column 402. The water pressure pushes the rotating column 402 to rotate rapidly, causing the snap-fit ​​plate 5063 to collide with the extension end of the electromagnetic limit pin 5061. The vibration generated by the impact is transmitted upward through the rotating column 402 to the filter layer unit 403, shaking off the attached impurities on the filter layer unit 403 and sliding them along the inclined surface of the solid area 4012 to the discharge port 1012. At the same time, during the rotation of the filter layer unit 403, its bottom scrapes away the impurities remaining on the filter area 4011 of the ring plate 401 in the direction of rotation. Under the action of gravity, the impurities slide along the inclined surface of the solid area 4012 and accumulate at the discharge port 1012. Operators can observe through the transparent sealing plate that when impurities accumulate to a preset height, they can activate the electromagnetic lock to open the sealing plate and discharge the impurities.

[0076] After primary filtration, the water enters the lower shell 103. Flocculant is added into the lower shell 103 through the chemical addition port. The control system starts the drive motor 501. The drive motor 501 drives the driven gear 504 to rotate through the drive gear 502 and the synchronous belt 503, which in turn drives the central cylinder 601, the first stirring plate 602, the lifting shaft 603 and the second stirring plate 604 to rotate, thereby realizing the mixing and stirring of wastewater and chemical.

[0077] During the mixing process, pollutants in the wastewater gradually form flocs.

[0078] In the actual operation of petrochemical wastewater treatment, operators have found that traditional flocculation reactors typically only handle mixing and reaction, with floc formation and subsequent solid-liquid separation being two separate processes. Even when good flocs are formed in the reactor, these flocs are still completely mixed with water that has not yet had all its pollutants removed. After the reaction, the entire mixture is transported to a separate sedimentation tank or clarifier for gravity separation, which heavily relies on natural sedimentation. This is particularly problematic when treating light or colloidal pollutants, as the slow sedimentation rate results in a large footprint for the treatment facility, increasing the subsequent treatment load and cost. To address this, the control system, based on data from the turbidity sensor on the first stirring plate 602, controls the cylinder 505 to extend and retract, driving the lifting shaft 603 and the second stirring plate 604 to move up and down. Specifically, in the initial state, the solid baffle 6041 of the second stirring plate 604 is located in the center of the first stirring plate 602, and the filter layers 6042 of adjacent second stirring plates 604 are in close contact, covering the gaps between the first stirring plates 602, allowing water to flow freely through the filter layers 6042. Because the pore sizes of the second stirring plates 604 on both sides of the central cylinder 601 are different, the flocs preferentially aggregate to one side through the large-pore filter layer 6042 and cannot pass through the small-pore filter layer 6042. When the turbidity sensor detects that the turbidity on the side of the small-pore filter layer 6042 reaches the preset high turbidity threshold and the turbidity on the side of the large-pore filter layer 6042 reaches the preset low turbidity threshold, the control system controls the drive motor 501 to stop rotating, and at the same time, the water in the low turbidity area corresponds to the position of the sewage pipe 7. Meanwhile, the wastewater will no longer be transported into the upper shell 101 through the inlet pipe 1011.

[0079] The control system opens the electromagnetic control valve of the sewage pipe 7 near the first treatment tank 1, and the low-turbidity water enters the second treatment tank 2 through the sewage pipe 7 for deep purification; after the water is transported, the electromagnetic control valve of the sewage pipe 7 near the first treatment tank 1 is closed.

[0080] When the impurities in the first treatment tank 1 accumulate to a preset amount and are detected by the turbidity sensor, the control system controls the cylinder 505 to contract, which drives the second stirring plate 604 to move upward. The solid baffle 6041 seals the gap between the two adjacent first stirring plates 602 to prevent impurities from flowing with the water.

[0081] When the electromagnetic control valve of the drain pipe 7 near the first treatment tank 1 is opened, impurities and some water in the first treatment tank 1 enter the impurity accumulation area of ​​the collection tank 301 through the drain pipe 7; at this time, the check valve of the drain pipe 7 near the second treatment tank 2 remains closed to prevent impurities from entering the second treatment tank 2.

[0082] When the turbidity sensor at the bottom of the collection tank 301 detects that the amount of impurities accumulated has reached a preset threshold, the control system starts the hydraulic cylinder 302, which drives the lower pressure plate 304 and the squeezing plate 303 to move downward. During the downward movement of the squeezing plate 303, the water flows upward through the water-permeable filter holes of the squeezing plate 303, and the impurities are intercepted and accumulate in the lower layer of the collection tank 301.

[0083] Extending the telescopic end of the hydraulic cylinder 302, the lower pressure plate 304 compresses the spring 3042, and the lower pressure column 3041 moves downward through the perforation 3031 of the extrusion plate 303 until the lower pressure plate 304 moves to the bottom. At this time, the lower pressure plate 304 is located below the connection between the sewage pipe 7 and the collection tank 301, dividing the inside of the collection tank 301 into two closed chambers, upper and lower.

[0084] Open the electromagnetic ball valve at the bottom of the collection tank 301 to discharge the impurities that have been squeezed and accumulated in the lower chamber. After the impurities are discharged, the control system controls the hydraulic cylinder 302 to retract, which drives the lower pressure plate 304 and the squeezing plate 303 to return to their initial positions.

[0085] During operation, operators discovered that due to fluctuations in the quality of petrochemical wastewater, the solid-liquid interface formed in the first treatment tank 1 after flocculation separation was fragile and unstable. If only static pressure or traditional pumping methods were used to transfer the filtered water to the second treatment tank 2, the slow drainage process would prolong the residence time of the filtered water in the first treatment tank 1. This would cause more flocculated sludge and impurities to be resuspended and mixed back into the filtered water, severely affecting the effluent quality of the first treatment tank 1. Therefore:

[0086] To improve the transfer efficiency between the first treatment tank 1 and the second treatment tank 2, initially, both the solenoid control valves and check valves at both ends of the drain pipe 7 are kept closed. When it is necessary to transfer water from the first treatment tank 1 to the second treatment tank 2, the solenoid control valve of the drain pipe 7 closest to the first treatment tank 1 is opened first. The control system controls the hydraulic cylinder 302 to contract, driving the extrusion plate 303 to move upward to the top, creating a negative pressure in the collection tank 301. This negative pressure accelerates the transfer speed of water from the lower shell 103 to the collection tank 301. Once the collection tank 301 is filled with water, the solenoid control valve of the drain pipe 7 closest to the first treatment tank 1 is closed, and the check valve of the drain pipe 7 closest to the second treatment tank 2 is opened.

[0087] The hydraulic cylinder 302 is extended by the control system, which drives the extrusion plate 303 to move downward until the extrusion plate 303 contacts the stop block 3011; the extension end of the hydraulic cylinder 302 continues to extend, and the lower pressure plate 304 moves downward, squeezing the water in the collection tank 301 located below the lower pressure plate 304 into the second treatment tank 2. During this stage, the lower pressure plate 304 moves downward at a horizontal height not lower than the connection between the sewage pipe 7 and the collection tank 301.

[0088] By repeating the above steps, the water in the first treatment tank 1 is efficiently transferred to the second treatment tank 2 through the extension and retraction of the hydraulic cylinder 302 and the alternating switching of the electromagnetic control valves and check valves at both ends of the sewage pipe 7.

[0089] After the efficient transfer of low-turbidity water from the first treatment tank 1 is completed, the remaining portion in the tank consists of high-concentration flocculent sludge accumulated on one side of the large-pore filter layer 6042 of the stirring assembly 6. To quickly and thoroughly remove this part of the impurities and prevent it from settling, caking, or backmixing in the tank, this high-concentration flocculent sludge is then discharged externally. The specific implementation process is as follows:

[0090] After the filtered water is transferred, the check valve near the second treatment tank 2 of the sewage pipe 7 is closed, and the electromagnetic control valve near the first treatment tank 1 remains closed. The turbidity sensor in the first treatment tank 1 detects that the sludge concentration meets the discharge conditions.

[0091] Subsequently, the electromagnetic control valve of the drain pipe 7 near the first treatment tank 1 is reopened. Simultaneously, the telescopic end of the hydraulic cylinder 302 rapidly retracts, causing the lower pressure plate 304 and the squeezing plate 303 to move upwards to the top of the collection tank 301. This action rapidly creates a strong negative pressure within the collection tank 301; the negative pressure acts directly on the sludge accumulation area of ​​the lower shell 103 of the first treatment tank 1 through the drain pipe 7. Under the combined action of negative pressure suction and static pressure within the tank, the high-concentration flocculated sludge, along with a small amount of entrained water, is rapidly drawn into the lower chamber of the collection tank 301.

[0092] Compared with traditional gravity sludge removal, this process is significantly faster, greatly shortens the emptying and preparation time of the first treatment tank 1, and reduces the ineffective retention of sludge in the tank.

[0093] During this process, when the turbidity sensor at the bottom of the collection tank 301 detects that the sludge concentration in the tank has reached a preset high threshold, it actively determines that the collection tank 301 is close to full load. At this time, it closes the electromagnetic control valve of the sewage pipe 7 near the first treatment tank 1 and stops the sludge from entering.

[0094] Subsequently, the telescopic end of the hydraulic cylinder 302 slowly extends, driving the lower pressure plate 304 and the extrusion plate 303 to move downwards. The extrusion plate 303 first contacts and compacts the sludge, and the free water in the sludge is discharged upwards through the microporous filter plate of the extrusion plate 303, achieving preliminary concentration and dewatering. The hydraulic cylinder 302 continues to extend, and after the lower pressure plate 304 is below the connection between the drain pipe 7 and the collection tank 301, the impurities accumulated at the bottom of the collection tank 301 are discharged.

[0095] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0096] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A petrochemical wastewater treatment device, comprising a first treatment tank (1) and a second treatment tank (2), characterized in that, A sewage discharge assembly (3) for water transfer between the first treatment tank (1) and the second treatment tank (2) is provided. The first processing tank (1) includes a primary filtration section, a driving section and a mixing section from top to bottom; the primary filtration section includes an upper shell (101) and a primary filtration assembly (4); the mixing section includes a lower shell (103) and a stirring assembly (6) disposed therein; the stirring assembly (6) includes a central bore cylinder (601) and a first stirring plate (602), as well as a lifting shaft (603) that can be raised and lowered through the central bore cylinder (601) and a second stirring plate (604); The second stirring plate (604) has a solid baffle (6041) in the middle for closing the flow channel, and filter layers (6042) with different pore sizes on its upper and lower sides for guiding the flocs to partition during the stirring process.

2. The petrochemical wastewater treatment device according to claim 1, characterized in that, The upper shell (101) is provided with a water inlet pipe (1011) for water intake and a discharge port (1012) for waste discharge. The primary filtration assembly (4) includes a ring plate (401), a rotating column (402), and filter layer units (403) distributed on the rotating column (402). The filter layer units (403) are used to trap large-particle impurities. The ring plate (401) includes a filter area (4011) with water-permeable holes and an inclined solid area (4012) for guiding impurities. The first stirring plate (602) is equipped with a sensor for detecting turbidity.

3. The petrochemical wastewater treatment device according to claim 1, characterized in that, The first treatment tank (1) and the second treatment tank (2) are connected by a drain pipe (7), and the drain assembly (3) is located in the middle of the drain pipe (7); The sewage discharge assembly (3) includes a collection tank (301), a drive source, and a squeezing plate (303) and a lowering plate (304) that can move within the tank. The squeezing plate (303) is a filter plate for permeating water and intercepting impurities.

4. The petrochemical wastewater treatment device according to claim 2, characterized in that, The bottom of the rotating column (402) is provided with a limiting structure, which includes an electromagnetic limiting pin (5061) and a snap-fit ​​plate (5063) that cooperates with it and rotates synchronously with the rotating column (402) to accurately position the filter layer unit (403) and the water inlet pipe (1011).

5. A petrochemical wastewater treatment device according to claim 2, characterized in that, The bottom of the filtration zone (4011) is equipped with a water flow rate sensor for monitoring its blockage status.

6. The petrochemical wastewater treatment device according to claim 1, characterized in that, The drive unit includes a drive motor (501) and a cylinder (505), which are used to drive the rotation of the central cylinder (601) and the lifting shaft (603) to rise and fall, respectively.

7. A petrochemical wastewater treatment device according to claim 3, characterized in that, The driving source of the sewage discharge component (3) is a hydraulic cylinder (302), and the extrusion plate (303) is elastically connected to the lower pressure plate (304) through a spring (3042); the inner wall of the collection tank (301) is provided with a stop (3011) for limiting the downward movement of the extrusion plate (303).

8. A petrochemical wastewater treatment device according to claim 3, characterized in that, The two ends of the sewage pipe (7) are respectively equipped with an electromagnetic control valve and a check valve for independently controlling the connection state.

9. A petrochemical wastewater treatment device according to claim 1, characterized in that, The bottom of the second stirring plate (604) at the bottom is a solid structure, which is used to fit the bottom slope of the lower shell (103) to scrape off residual impurities.

10. A petrochemical wastewater treatment device according to claim 1, characterized in that, It also includes a control system, which controls the operation of the drive motor (501), cylinder (505), hydraulic cylinder (302) and valves based on sensor signals.

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