A pickling line wastewater treatment device and treatment method

Abstract

This invention discloses a wastewater treatment device and method for pickling lines, relating to the field of wastewater treatment technology for pickling lines. The wastewater treatment device includes, in sequence, an injection tank, a reagent storage tank system, an equalization tank, a neutralization reaction tank, a coagulation sedimentation tank, a sludge thickening tank, a sludge dewatering device, a collection tank, a purification tank, and a sludge storage bin. The sludge dewatering device includes a shell; a filter frame located inside the shell, through which sludge enters the filter frame via a conveying pipe; a rotating assembly driving the filter frame to rotate, causing the sludge to be dewatered by centrifugal force; and a squeeze filter plate disposed inside the filter frame for squeezing the sludge. By installing a reciprocatingly movable squeeze filter plate within a rotatable filter frame, the synergistic effect of dynamic centrifugal force and intermittent mechanical pressure can significantly improve dewatering efficiency and cake solids content.

Description

Technical Field

[0001] This invention relates to the field of pickling line wastewater treatment technology, specifically to a pickling line wastewater treatment device and treatment method. Background Technology

[0002] Pickling lines are a critical process before cold rolling of steel. They remove iron oxide scale and dirt from the surface of steel strips through mechanical and chemical action. The wastewater generated is characterized by high acidity, heavy metal ions (such as iron, copper, and chromium), and harmful chemicals. Direct discharge would pollute the environment, corrode equipment, and endanger human health; therefore, it must be treated in accordance with laws and regulations. Treatment methods include chemical neutralization (such as adding lime slurry to adjust pH and generate metal hydroxide precipitates), physicochemical treatment (such as coagulation sedimentation and filtration), membrane separation technology (such as reverse osmosis to concentrate acid), and evaporation crystallization to recover resources. These methods, combined with advanced treatment techniques (such as advanced oxidation and activated carbon adsorption), achieve compliant discharge and resource reuse.

[0003] However, the following problems still exist in the process of dewatering sludge generated during wastewater treatment:

[0004] (1) Using only the rotary centrifugal dewatering method is sensitive to the physical properties of sludge. High viscosity sludge is prone to forming an adhesion layer on the inner wall of the filter frame, resulting in a reduction of the effective separation surface, more bound water residue, unstable treatment moisture content, and sludge is not easy to form a sludge cake that is easy to discharge, which affects the overall dewatering efficiency of sludge. Using only the mechanical extrusion dewatering method, under static pressure, the sludge surface forms a dense shell due to rapid water loss, which hinders the migration of internal moisture and forms a sandwich structure that is dry on the outside and wet on the inside. The efficiency is low and the dewatering effect is not ideal.

[0005] (2) The sludge lacks dynamic shear force, and the colloidal particles or fibers in the sludge are easily entangled into clumps, making it difficult to release the internal capillary water. Even after centrifugation or high-pressure extrusion, some of the clumps of sludge cake still exhibit an externally dry and internally sticky state, making it difficult to completely remove the water from the sludge. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a pickling line wastewater treatment device and method, which solves the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a wastewater treatment device for an acid pickling line, comprising, in sequence, an injection tank, a reagent storage tank system, an equalization tank, a neutralization reaction tank, a coagulation sedimentation tank, a sludge thickening tank, a sludge dewatering device, a collection tank, a purification tank, and a sludge storage bin; wherein the sludge dewatering device includes a shell; a filter frame located inside the shell, through which sludge enters the filter frame via a conveying pipe; a rotating assembly for driving the filter frame to rotate, thereby subjecting the sludge to centrifugal force for dewatering; a squeeze filter plate disposed inside the filter frame for squeezing the sludge; and a linkage assembly for connecting the rotating assembly and the squeeze filter plate, enabling the squeeze filter plate to reciprocate in squeezing the sludge.

[0008] Furthermore, a square filter plate is provided at the upper center of the filter frame, and a weight block is provided at the upper end of the square filter plate.

[0009] Furthermore, stirring blades are rotatably mounted on the left and right inner walls of the filter frame, and through slots for the stirring blades are provided on the corresponding extrusion filter plates.

[0010] Furthermore, the sludge dewatering equipment has mounting plates installed on the left and right inner walls above the shell, and a support column that slides up and down with the mounting plate is installed at the upper end of the shell. A telescopic spring is sleeved on the support column above the mounting plate, and a slider that slides up and down with the inner wall of the sludge dewatering equipment is installed on the outer side of the shell.

[0011] Furthermore, the rotating assembly includes an external gear ring fixedly fitted on the outer side of the upper end of the filter frame. The external gear ring is rotatably connected to the housing through a rotating frame. A rotating gear that is rotatably connected to the housing is meshed on the outer side of the external gear ring. A support frame that rotatably engages with the lower end of the filter frame is installed on the inner wall of the housing.

[0012] Furthermore, the linkage component includes a drive frame installed on the inner wall of the housing, a control rod that slides with the filter frame on the outer side of the extruded filter plate, and a ball bearing that slides with the drive frame at the end of the control rod away from the filter frame.

[0013] Furthermore, a bevel gear one is rotatably mounted on the upper end of the rotating gear and mounted on the upper end of the housing. A bevel gear two meshes with the rear side of the bevel gear one. An incomplete gear is mounted on the bevel gear two via a rotating shaft mounted on the upper part of the housing. A drive motor is mounted on the upper end of the bevel gear one. A splined shaft is mounted on the lower end of the output shaft of the drive motor. A sleeve that slides vertically with the splined shaft is mounted on the upper end of the bevel gear one. A rack that slides vertically with the housing is mounted on the upper end of the weight block. The rack meshes with the incomplete gear.

[0014] Furthermore, the control rods located on the left and right sides are provided with spiral grooves, and the outer side of the filter frame is rotatably mounted with a drive pulley sleeved on the control rod. The drive pulley is equipped with a sliding column adapted to the spiral groove, and the outer side of the filter frame is rotatably mounted with a driven pulley connected to the stirring blade. The drive pulley is connected to the driven pulley by a belt.

[0015] Furthermore, the lower end of the square filter plate is equipped with evenly arranged insert rods.

[0016] This invention also provides a method for treating wastewater from a pickling line, applicable to wastewater treatment devices for pickling lines, comprising the following steps:

[0017] Step 1: Introduce the pickling wastewater into the equalization tank for preliminary collection and water quality and quantity homogenization.

[0018] Step 2: The adjusted wastewater is transported to the neutralization reaction tank, where sodium hydroxide or lime slurry is added through the reagent storage tank system to adjust the pH of the wastewater to 8-9, causing heavy metal ions to precipitate as hydroxides.

[0019] Step 3: PAC and PAM are added sequentially to the coagulation sedimentation tank to form flocs and accelerate sedimentation, removing residual suspended solids and metal flocs, and achieving mud-water separation.

[0020] Step 4: The sludge discharged from the bottom of the coagulation sedimentation tank is transported to the sludge thickening tank for gravity thickening to reduce the water content.

[0021] Step 5: The concentrated sludge enters the sludge dewatering equipment, which performs rotary centrifugal and reciprocating extrusion dewatering operations on the sludge, and finally forms a sludge cake.

[0022] Step Six: The dehydrated sludge cake is temporarily stored in a sludge storage silo and then transported out for harmless disposal or resource utilization.

[0023] Step 7: The supernatant after sedimentation and the water after sludge dewatering are further treated by the filtration system and then flow into the water purification tank to meet the discharge or reuse standards.

[0024] The present invention has the following beneficial effects:

[0025] (1) The pickling line wastewater treatment device, by setting a reciprocating extrusion filter plate in a rotatable filter frame, can significantly improve the dewatering efficiency and cake solids content by utilizing the synergistic effect of dynamic centrifugal force and intermittent mechanical pressure. When the filter frame rotates, the sludge is quickly separated from free water under the action of centrifugal force. At the same time, it can avoid the problem of insufficient dewatering caused by inconsistent water content in different parts of the sludge. The reciprocating extrusion of the filter plate can quickly form a cake, which is easy to discharge. It can also destroy the capillary structure of the sludge and squeeze out the bound water. The filtrate is continuously discharged through rotational motion, avoiding the "pressure decay" problem of traditional static pressure filtration. In addition, while dynamic centrifugation reduces the risk of filter frame blockage, intermittent extrusion can enhance deep dewatering, which is conducive to improving dewatering efficiency.

[0026] (2) The pickling line wastewater treatment device adopts a square filter plate that can repeatedly beat the sludge up and down and the rotation-extrusion synergy, which can significantly improve the dewatering efficiency. The dynamic impact force generated by high frequency beating destroys the colloidal structure and capillary bound water inside the sludge, and applies vertical downward pressure to the sludge, which is conducive to releasing deep bound water. At the same time, the design of the square filter plate and the rotating filter frame strengthens the local pressure gradient, promotes the rapid discharge of filtrate and reduces sludge residue in the filter frame.

[0027] (3) The wastewater treatment device of the pickling line has a synchronous linkage reciprocating rotating stirring blade design that optimizes the dewatering process through multi-scale shearing. The reciprocating rotation of the stirring blade can break up the sludge, prevent clumping, and make the sludge spread more evenly in the filter frame, resulting in a more thorough dewatering effect and improved dewatering speed. At the same time, it can also avoid the problems of sludge cake layering or excessive compaction caused by insufficient shearing or overload in traditional equipment.

[0028] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0029] Figure 1 This is an overall diagram of the present invention;

[0030] Figure 2 This is a three-dimensional structural diagram of the sludge dewatering equipment in this invention;

[0031] Figure 3 This is a schematic diagram of the internal structure of the sludge dewatering equipment in this invention;

[0032] Figure 4 For the present invention Figure 3 A schematic diagram of the cross-sectional planar structure;

[0033] Figure 5 This is a schematic diagram of the internal structure of the shell in this invention;

[0034] Figure 6This is a three-dimensional structural diagram of the support column, telescopic spring, and slider in this invention;

[0035] Figure 7 This is a three-dimensional structural diagram of the rotating component and the linkage component in this invention;

[0036] Figure 8 For the present invention Figure 7 Enlarged view of region A in the middle;

[0037] Figure 9 This is a three-dimensional structural diagram of bevel gear one, bevel gear two, rack and incomplete gear in this invention;

[0038] Figure 10 This is a three-dimensional structural diagram of the drive frame, control rod, active pulley, and passive pulley in this invention;

[0039] Figure 11 This is a three-dimensional structural diagram of the extruded filter plate, the square filter plate, and the stirring blade in this invention;

[0040] Figure 12 This is a diagram showing the fit between the spiral groove and the sliding column in this invention.

[0041] In the diagram, 1. Water injection tank; 2. Chemical storage tank system; 3. Equalization tank; 4. Neutralization reaction tank; 5. Coagulation sedimentation tank; 6. Sludge thickening tank; 7. Sludge dewatering equipment; 71. Shell; 711. Outlet chamber; 712. Outlet; 713. Outlet pipe; 72. Filter frame; 721. Feed chamber; 722. Conveying pipe; 723. External gear ring; 724. Rotating gear; 725. Rotating frame; 726. Support frame; 727. Extrusion filter plate; 728. Drive frame; 729. Control rod; 730. Ball bearing; 731. Square filter plate; 732. Weight block; 7 33. Insert rod; 734. Bevel gear one; 735. Bevel gear two; 736. Incomplete gear; 737. Drive motor; 738. Tooth rack; 739. Stirring blade; 740. Spiral groove; 741. Drive pulley; 742. Sliding column; 743. Driven pulley; 744. Belt; 745. Limit block; 75. Mounting plate; 751. Support column; 752. Telescopic spring; 753. Slider; 754. Guide rail; 761. Splined shaft; 762. Sleeve; 763. Discharge chamber; 764. Automatic door; 8. Water collection tank; 9. Clean water tank; 10. Sludge storage bin. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0044] The following reference Figure 1 - Figure 12 This invention describes a pickling line wastewater treatment device and treatment method provided by an embodiment of the present invention.

[0045] On the one hand, the present invention provides a wastewater treatment device for pickling lines.

[0046] Please see Figure 1 and Figure 2 The pickling line wastewater treatment device includes, in sequence, an injection tank 1, a reagent storage tank system 2, an equalization tank 3, a neutralization reaction tank 4, a coagulation sedimentation tank 5, a sludge thickening tank 6, a sludge dewatering device 7, a collection tank 8, a purified water tank 9, and a sludge storage silo 10. Specifically, the reagent storage tank system 2 includes a sodium hydroxide storage tank, a lime slurry storage tank, a PAC storage tank, and a PAM storage tank. Each storage tank outlet is equipped with a metering pump and a dosing pipeline. The injection tank 1 is connected to it and is used to inject water into the storage tanks. The equalization tank 3 is used to receive and initially collect wastewater from the pickling line and to perform water quality and quantity homogenization treatment on the wastewater. The neutralization reaction tank 4 is connected to... The outlet of the equalization tank 3 is connected to the chemical storage tank system 2, which can add alkaline chemicals to the wastewater to adjust the pH. The coagulation sedimentation tank 5 is used to remove suspended solids and metal flocs. The sludge thickening tank 6 is connected to the sludge discharge port of the coagulation sedimentation tank 5 and is used to gravity thicken the generated sludge. The sludge dewatering equipment 7 is connected to the bottom sludge discharge port of the sludge thickening tank 6 through the conveying pipe 722 and is used to dewater the thickened sludge. The water collection tank 8 is used to collect the water after sludge dewatering. The water purification tank 9 is used to collect the treated clean water. The sludge storage bin 10 is used to temporarily store the dewatered sludge, waiting for external transportation or resource disposal.

[0047] Combination Figure 3 and Figure 4As shown, the sludge dewatering equipment 7 is equipped with a shell 71, and a filter frame 72 is installed inside the shell 71. Two feed chambers 721 that penetrate the shell 71 are installed on the upper end of the filter frame 72. The feed chambers 721 are connected to the conveying pipe 722 for conveying sludge. The conveying pipe 722 can convey the sludge in the sludge thickening tank 6 from the feed chambers 721 to the filter frame 72. The filter frame 72 can provide temporary storage space for the sludge, so that the liquid in the sludge can be discharged through the filter holes.

[0048] In addition, such as Figures 3-5 As shown, a water outlet chamber 711 is installed at the lower end of the housing 71. The inner wall of the water outlet chamber 711 is inclined towards the direction of the water outlet 712 located at the lower end of the sludge dewatering equipment 7. The water outlet 712 is connected to the water collection tank 8 through the water outlet pipe 713. The liquid discharged through the filter frame 72 can enter the housing 71. The liquid entering the housing 71 can be retained in the water outlet 712 through the water outlet chamber 711 and finally transported to the water collection tank 8 through the water outlet pipe 713.

[0049] To utilize centrifugal force to accelerate the separation of free water in sludge and improve dewatering efficiency, such as Figure 5 , Figure 7 and Figure 9 As shown, a rotating assembly for driving the filter frame 72 to rotate is also provided, so that the sludge is dewatered by centrifugal force. The rotating assembly includes an external toothed ring 723 fixedly fitted on the outer side of the upper end of the filter frame 72. A rotating gear 724 rotatably connected to the housing 71 is meshed on the outer side of the external toothed ring 723. The drive source can drive the rotating gear 724 to rotate. When the rotating gear 724 rotates, it can drive the external toothed ring 723 meshing with it to rotate synchronously. The filter frame 72 rotates synchronously with the external toothed ring 723. When the filter frame 72 rotates, due to the centrifugal force, the free water in the sludge will be thrown out more quickly, accelerating the initial solid-liquid separation process. In addition, the rotation can also make the sludge more evenly distributed in the filter frame 72, so that the entire filtration area is fully utilized, rather than concentrated in certain areas, thereby improving the overall dewatering efficiency.

[0050] Optionally, the upper end of the external gear ring 723 is equipped with a rotating frame 725 that is rotatably connected to the housing 71. The rotating frame 725 can provide stable rotational support for the external gear ring 723 and ensure that the external gear ring 723 can rotate smoothly and accurately. At the same time, the inner wall of the housing 71 is equipped with a support frame 726 that rotatably engages with the lower end of the filter frame 72. The support frame 726 can provide positioning support and stable guidance for the rotation of the filter frame 72.

[0051] like Figure 11As shown, in order to further remove capillary water and some bound water from the sludge, a squeeze filter plate 727 is also provided inside the filter frame 72. The squeeze filter plate 727 can reciprocate to squeeze the sludge during the rotary dewatering process. By applying mechanical pressure to the sludge, the water content of the sludge can be greatly reduced, and deep dewatering of the sludge can be achieved. In addition, in order to ensure that the squeeze filter plates 727 do not interfere with each other during the reciprocating squeezing process, the width of the front and rear squeeze filter plates 727 is smaller than the width of the left and right squeeze filter plates 727, and there is enough space between the squeeze filter plates 727 to accommodate the formation of sludge cake.

[0052] like Figure 5 , Figure 7 , Figure 10 and Figure 11 As shown, a linkage assembly for connecting the rotating component and the extrusion filter plate 727 is also provided. The linkage assembly can drive the extrusion filter plate 727 to reciprocate and extrude the sludge during sludge rotation and dewatering. The linkage assembly includes a drive frame 728 installed on the inner wall of the housing 71. The drive frame 728 is in the shape of a multi-segmented rhomboid. A control rod 729 that slides with the filter frame 72 is installed on the outer side of the extrusion filter plate 727. When the filter frame 72 rotates, the extrusion filter plate 727 and the control rod 729 rotate synchronously. Because the drive frame 728 is in a stationary state while the control rod 729 is in a rotating state, and because the drive frame 728 is in the shape of a multi-segmented rhomboid. Therefore, during the rotation process, the control rod 729 can continuously reciprocate to contact the protruding section of the drive frame 728, thereby enabling the control rod 729 to drive the extrusion filter plate 727 to reciprocate along the filter frame 72. The two opposing extrusion filter plates 727 can simultaneously extrude the sludge in opposite directions. The reciprocating extrusion filter plates 727 play a dynamic pressure dewatering role on the sludge during the rotation dewatering process. Through periodic pressure application and release, the capillary structure inside the sludge is effectively destroyed, promoting the precipitation of water from the sludge. At the same time, it avoids the decrease in dewatering efficiency caused by long-term static pressure between the filter plate and the sludge, thereby improving the overall dewatering speed and the dryness of the sludge cake.

[0053] like Figure 10 and Figure 11 As shown, since the control lever 729 is in a rotating state, it will wear against the drive frame 728 when rotating. Therefore, preferably, a ball bearing 730 that slides with the drive frame 728 is installed at the end of the control lever 729 away from the filter frame 72. The ball bearing 730 is used to reduce the friction between the control lever 729 and the drive frame 728.

[0054] Preferred, such as Figures 9-11As shown, a square filter plate 731 is provided in the middle of the upper end of the filter frame 72. A weight block 732 is provided on the upper end of the square filter plate 731. Under the gravity of the weight block 732, the square filter plate 731 can repeatedly beat the sludge located in the filter frame 72, which further promotes the release of water trapped in the sludge more quickly. In addition, the sludge can be quickly formed under the mutual compression of the compression filter plate 727 and the square filter plate 731. Furthermore, evenly arranged insertion rods 733 are installed at the lower end of the square filter plate 731. The insertion rods 733 can be inserted into the sludge to break its dense structure, accelerate the discharge of water from the inside to the outside, and enhance the penetration power and drainage efficiency of the square filter plate 731.

[0055] To achieve the reciprocating up-and-down movement of the square filter plate 731 and the weight block 732, such as Figures 5-7 and Figure 9 As shown, a bevel gear 734 is rotatably mounted on the upper end of the rotating gear 724 and mounted on the upper end of the housing 71. The rotating gear 724 can rotate synchronously with the bevel gear 734. A bevel gear 735 meshes with the rear side of the bevel gear 734. An incomplete gear 736 is mounted on the bevel gear 735 via a rotating shaft rotatably mounted above the housing 71. The bevel gear 735 can convert the horizontal rotation of the bevel gear 734 into the vertical rotation required by the rotating shaft. The incomplete gear 736 rotates synchronously with the rotating shaft. A drive motor 737 is mounted on the upper end of the bevel gear 734 and is installed inside the sludge dewatering equipment 7. The drive motor 737 is used to drive the rotation of the bevel gear 734. In addition, a rack 738 is mounted on the upper end of the weight block 732 and slides vertically with the housing 71. The rack 738 meshes with the incomplete gear 736, and the upper end of the rack 738 is away from the rack. A limiting block 745 is installed on one side of the tooth. The limiting block 745 can limit the downward movement of the toothed rod 738 by abutting against the housing 71, so as to prevent the toothed rod 738 from moving too far downward. When the incomplete gear 736 rotates, it can drive the toothed rod 738 to move upward. When the toothed rod 738 is opposite to the toothless part of the incomplete gear 736, the toothed rod 738 disengages from the teeth of the incomplete gear 736. Under the action of the gravity of the weight block 732, the toothed rod 738, the weight block 732 and the square filter plate 731 can fall freely and quickly, and beat the sludge vertically. When the toothed rod 738 moves down to a certain position, part of it still remains above the housing 71. As the incomplete gear 736 continues to rotate, the incomplete gear 736 can mesh with the toothed rod 738 again, so that the toothed rod 738 moves upward. Thus, the toothed rod 738 can drive the weight block 732 and the square filter plate 731 to beat the sludge up and down repeatedly.

[0056] Preferred, such as Figure 11As shown, stirring blades 739 are rotatably installed on both the left and right inner walls of the filter frame 72. The rotation of the stirring blades 739 can further distribute the sludge evenly. By dynamically stirring, the sludge morphology is broken, which can prevent sludge from clumping and avoid uneven dewatering caused by local accumulation. At the same time, it can enhance the power of water to be separated from the sludge and significantly improve the solid-liquid separation effect. Furthermore, the corresponding extrusion filter plate 727 is provided with a through groove for passing through the stirring blades 739. The through groove is used to avoid the stirring blades 739 and ensure that the reciprocating movement of the extrusion filter plate 727 is not disturbed by the stirring blades 739.

[0057] While rotary dehydration and extrusion dehydration are carried out simultaneously, in order to achieve simultaneous automatic rotation of the stirring blades 739, such as... Figures 10-12 As shown, spiral grooves 740 are provided on the control rods 729 on the left and right sides. A drive pulley 741 is rotatably mounted on the outside of the filter frame 72 and sleeved on the control rod 729. A sliding column 742 adapted to the spiral groove 740 is installed on the drive pulley 741. When the control rod 729 moves back and forth, the sliding column 742 can slide relative to the spiral groove 740, thereby forcing the drive pulley 741 to rotate. A driven pulley 743 connected to the stirring blade 739 is rotatably mounted on the outside of the filter frame 72. The drive pulley 741 is connected to the driven pulley 743 through a belt 744. When the drive pulley rotates, the driven pulley 743 connected to it can rotate synchronously through the belt 744. The driven pulley 743 can drive the stirring blade 739 connected to it to rotate together. Thus, the stirring blade 739 can rotate back and forth with the reciprocating movement of the control rod 729.

[0058] To further drain the moisture inside the housing 71 and filter frame 72, such as Figure 3 , Figure 4 and Figure 6 As shown, mounting plates 75 located above the housing 71 can also be installed on the left and right inner walls of the sludge dewatering equipment 7. A support column 751 that slides up and down with the mounting plate 75 is installed on the upper end of the housing 71. A telescopic spring 752 located above the mounting plate 75 is sleeved on the support column 751. The elastic coefficient of the telescopic spring 752 is moderate, which can both support the housing 71 and deform under force. The housing 71 can be elastically installed in the sludge dewatering equipment 7 through the mounting plate 75, the support column 751 and the telescopic spring 752. During the sludge feeding or dewatering process, the housing 71 may be affected by gravity or other forces. By squeezing or stretching the telescopic spring 752, the support column 751 moves up and down along the mounting plate 75, thereby realizing the up and down shaking of the housing 71. The up and down shaking of the housing 71 can not only further drain the water from the sludge in the filter frame 72, but also accelerate the water flow in the housing 71 to the outlet 712, thereby enhancing the water discharge efficiency.

[0059] In addition, to improve the stability of the casing 71, continue to refer to Figure 3 , Figure 4 and Figure 6 Two sliders 753 are also installed on the outside of the housing 71, distributed on the left and right. The inner wall of the sludge dewatering equipment 7 is equipped with a guide rail 754 that slides up and down with the sliders 753. The housing 71 can drive the sliders 753 to move up and down along the guide rail 754. The connection between the sliders 753 and the guide rail 754 can guide the up and down swaying of the housing 71 and provide a stable moving support point for the housing 71, which helps to increase the stability of the housing 71.

[0060] Because the drive motor 737 is installed on the inner wall of the sludge dewatering equipment 7, and because the housing 71 drives the connected parts to slide up and down synchronously, in order to ensure that the drive motor 737 can smoothly drive the bevel gear 734 to rotate, such as... Figure 8 and Figure 9 As shown, a splined shaft 761 is installed at the lower end of the output shaft of the drive motor 737, and a sleeve 762 is installed at the upper end of the bevel gear 734, which slides up and down with the splined shaft 761. The sleeve 762 can slide up and down along the splined shaft 761 to ensure that the output shaft of the drive motor 737 can always drive the bevel gear 734, which moves up and down, to rotate. In addition, it should be noted that the end of the conveying pipe 722 can extend and retract with the movement of the feed chamber 721.

[0061] To achieve the discharge of mud cake, such as Figure 5 , Figure 7 and Figure 11 As shown, a discharge port can be opened at the lower middle of the filter frame 72. A discharge chamber 763 is installed at the lower end of the discharge port, which penetrates the water outlet chamber 711. The sludge cake can be discharged through the discharge chamber 763 to the sludge storage bin 10 located in the sludge drainage equipment. An automatic door 764 is provided in the discharge port. The automatic door 764 is always closed during sludge dewatering. The automatic door 764 can be controlled by an existing control device (the device is not specifically shown in the figure). When the water contained in the sludge is fully removed, the control device can control the automatic door 764 to open. At this time, the downward-moving square filter plate 731 can be pressed down to form a sludge cake from the discharge port to the discharge chamber 763. The sludge cake finally flows into the sludge storage bin 10.

[0062] like Figures 3-11As shown, in actual use (operation), the sludge first needs to be conveyed into the filter frame 72. Then, the drive motor 737 drives the bevel gear 734 to rotate, which in turn drives the rotating gear 724 to rotate synchronously. The rotating gear 724 drives the filter frame 72 to rotate synchronously through the external gear ring 723, thus rotating and dewatering the sludge. At the same time, with the cooperation of the control rod 729 and the drive frame 728, the squeeze filter plate 727 can reciprocate to squeeze the sludge in the filter frame 72, further draining the water. In addition, with the cooperation of the drive pulley 741 and the control rod 729, the driven pulley 743 can drive... The stirring blade 739 reciprocates to break up the compact state of the sludge and better extract water. In addition, the second bevel gear 735 can rotate synchronously with the first bevel gear 734, and the incomplete gear 736 rotates synchronously with it via the rotating shaft. Under the action of the rack 738 and the incomplete gear 736, the square filter plate 731 can reciprocate to pound the sludge under the action of the weight block 732, further compressing the sludge block and improving the sludge dewatering efficiency. Finally, the separated water can flow into the shell 71 and flow to the outlet 712 through the outlet chamber 711. The sludge cake can be discharged into the sludge storage bin 10 through the discharge port and discharge chamber 763.

[0063] On the other hand, the present invention also provides a method for treating wastewater from a pickling line, applicable to wastewater treatment devices for pickling lines, combined with... Figure 1 and Figure 2 This includes the following steps:

[0064] Step 1: Introduce the pickling wastewater into equalization tank 3 for initial collection and water quality and quantity homogenization adjustment.

[0065] Step 2: The adjusted wastewater is transported to neutralization reaction tank 4, and sodium hydroxide or lime slurry is added through the reagent storage tank system 2 to adjust the pH of the wastewater to 8-9, so that heavy metal ions can form hydroxide precipitates.

[0066] Step 3: PAC and PAM are added sequentially to coagulation sedimentation tank 5 to form flocs and accelerate sedimentation, remove residual suspended solids and metal flocs, and achieve mud-water separation.

[0067] Step 4: The sludge discharged from the bottom of the coagulation sedimentation tank 5 is transported to the sludge thickening tank 6 for gravity thickening to reduce the water content.

[0068] Step 5: The concentrated sludge enters the sludge dewatering equipment 7, which performs rotary centrifugation and reciprocating compression dewatering operations on the sludge, and finally forms a sludge cake.

[0069] Step 6: The dehydrated sludge cake is temporarily stored in sludge storage silo 10 and then transported out for harmless disposal or resource utilization.

[0070] Step 7: The supernatant after sedimentation and the water after sludge dewatering can be further treated by the filtration system before flowing into the water purification tank 9 to meet the discharge or reuse standards.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0072] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A wastewater treatment device for a pickling line, characterized in that, It includes, in sequence, a water injection tank (1), a chemical storage tank system (2), an equalization tank (3), a neutralization reaction tank (4), a coagulation sedimentation tank (5), a sludge thickening tank (6), a sludge dewatering equipment (7), a water collection tank (8), a water purification tank (9), and a sludge storage silo (10): The sludge dewatering equipment (7) is equipped with a shell (71). A filter frame (72) is located inside the housing (71), and sludge enters the filter frame (72) through a conveying pipe (722); A rotating assembly is used to drive the filter frame (72) to rotate, so that the sludge is subjected to centrifugal force and dewatered; A squeeze filter plate (727) is disposed inside the filter frame (72) and is used to squeeze sludge. The linkage component is used to connect the rotating component and the extrusion filter plate (727) so that the extrusion filter plate (727) reciprocates to extrude sludge; A square filter plate (731) is provided at the middle of the upper end of the filter frame (72), and a weight block (732) is provided at the upper end of the square filter plate (731). The rotating assembly includes an external gear ring (723) fixedly fitted on the outer side of the upper end of the filter frame (72). The external gear ring (723) is rotatably connected to the housing (71) through a rotating frame (725). A rotating gear (724) meshes with the outer side of the external gear ring (723) and is rotatably connected to the housing (71). A support frame (726) is installed on the inner wall of the housing (71) and is rotatably engaged with the lower end of the filter frame (72). The linkage assembly includes a drive frame (728) installed on the inner wall of the housing (71), and a control rod (729) that slides with the filter frame (72) is installed on the outer side of the extruded filter plate (727). A ball bearing (730) that slides with the drive frame (728) is installed on the end of the control rod (729) away from the filter frame (72).

2. The pickling line wastewater treatment device according to claim 1, characterized in that: The filter frame (72) is rotatably mounted with stirring blades (739) on both the left and right inner walls, and the corresponding extrusion filter plate (727) is provided with a through groove for passing through the stirring blades (739).

3. The pickling line wastewater treatment device according to claim 1, characterized in that: The sludge dewatering equipment (7) is equipped with mounting plates (75) on the left and right inner walls above the shell (71). The upper end of the shell (71) is equipped with a support column (751) that slides up and down with the mounting plate (75). A telescopic spring (752) is sleeved on the support column (751) above the mounting plate (75). A slider (753) that slides up and down with the inner wall of the sludge dewatering equipment (7) is installed on the outer side of the shell (71).

4. The pickling line wastewater treatment device according to claim 1, characterized in that: The upper end of the rotating gear (724) is provided with a bevel gear one (734) rotatably mounted on the upper end of the housing (71). The rear side of the bevel gear one (734) meshes with a bevel gear two (735). The bevel gear two (735) is mounted with an incomplete gear (736) through a rotating shaft rotatably mounted above the housing (71). The upper end of the bevel gear one (734) is provided with a drive motor (737). The lower end of the output shaft of the drive motor (737) is mounted with a spline shaft (761). The upper end of the bevel gear one (734) is provided with a sleeve (762) that slides up and down with the spline shaft (761). The upper end of the weight block (732) is provided with a rack (738) that slides up and down with the housing (71). The rack (738) meshes with the incomplete gear (736).

5. The pickling line wastewater treatment device according to claim 2, characterized in that: The control rods (729) located on the left and right sides are provided with spiral grooves (740). The filter frame (72) is rotatably mounted with a drive pulley (741) sleeved on the control rod (729). The drive pulley (741) is equipped with a sliding column (742) adapted to the spiral groove (740). The filter frame (72) is rotatably mounted with a driven pulley (743) connected to the stirring blade (739). The drive pulley (741) is connected to the driven pulley (743) through a belt (744).

6. The pickling line wastewater treatment device according to claim 1, characterized in that: The square filter plate (731) is equipped with evenly arranged insert rods (733) at its lower end.

7. A method for treating pickling line wastewater, applicable to the pickling line wastewater treatment device according to any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: The pickling wastewater is introduced into the equalization tank (3) for preliminary collection and water quality and quantity homogenization adjustment; Step 2: The adjusted wastewater is transported to the neutralization reaction tank (4), and sodium hydroxide or lime milk is added through the reagent storage tank system (2) to adjust the pH of the wastewater to 8-9, so that heavy metal ions can form hydroxide precipitates. Step 3: PAC and PAM are added sequentially to the coagulation sedimentation tank (5) to form flocs and accelerate sedimentation, remove residual suspended matter and metal flocs, and achieve mud-water separation; Step 4: The sludge discharged from the bottom of the coagulation sedimentation tank (5) is transported to the sludge thickening tank (6) for gravity thickening to reduce the water content; Step 5: The concentrated sludge enters the sludge dewatering equipment (7), which performs rotary centrifugation and reciprocating extrusion dewatering on the sludge and finally forms a sludge cake; Step 6: The dehydrated mud cake is temporarily stored in the sludge storage silo (10) and then transported out for harmless disposal or resource utilization. Step 7: The supernatant after sedimentation and the water after sludge dewatering are further treated by the filtration system and then flow into the water purification tank (9) to meet the discharge or reuse standards.

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