Pickling line wastewater treatment device and treatment method

Abstract

The invention discloses a pickling line wastewater treatment device and treatment method, and relates to the technical field of pickling line wastewater treatment. The pickling line wastewater treatment device comprises a water injection tank, a medicament storage tank system, an adjusting tank, a neutralization reaction tank, a coagulative precipitation tank, a sludge concentration tank, sludge dewatering equipment, a water collecting tank, a water purifying tank and a sludge storage bin which are communicated in sequence, the filter frame is located in the shell, and sludge enters the filter frame through the conveying pipeline; the rotating assembly is used for driving the filtering frame to rotate, so that the sludge is dehydrated under the action of centrifugal force; the extrusion filter plate is arranged on the inner side of the filter frame and is used for extruding the sludge. The extrusion filter plate capable of reciprocating is arranged in the rotatable filter frame, so that the dehydration efficiency and the solid content of a mud cake can be remarkably improved by utilizing the synergistic effect of dynamic centrifugal force and intermittent mechanical pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of pickling line wastewater treatment, and specifically to a pickling line wastewater treatment device and a treatment method therefor. Background Art

[0002] The pickling line is a key process before cold rolling of steel. Through mechanical and chemical actions, the scale and dirt on the surface of the strip steel are removed. The wastewater generated has characteristics such as high acidity, heavy metal ions (such as iron, copper, chromium), and harmful chemical substances. Direct discharge will pollute the environment, corrode equipment, and endanger human health. Therefore, it needs to be treated in accordance with laws and regulations. The treatment methods include chemical neutralization (such as adding lime milk to adjust the pH and generate metal hydroxide precipitates), physicochemical treatment (such as coagulation precipitation, filtration), membrane separation technology (such as reverse osmosis to concentrate acid solution), evaporation crystallization to recover resources, etc., combined with advanced treatment means (such as advanced oxidation, activated carbon adsorption) to achieve up-to-standard discharge and resource recycling.

[0003] However, there are still the following problems in the process of dewatering the sludge generated during the wastewater treatment process: (1) The method of only using rotary centrifugal dewatering is sensitive to the physical properties of the sludge. High-viscosity sludge is prone to form an adhesion layer on the inner wall of the filter frame, resulting in a reduction of the effective separation surface, more residual bound water, unstable treatment moisture content, and at the same time, the sludge is not easy to form a mud cake that is convenient for discharging, affecting the overall sludge dewatering efficiency; only using the method of mechanical extrusion dewatering, under static pressure, a dense outer shell is formed on the surface of the sludge due to rapid water loss, hindering the migration of internal water, forming a sandwich structure with a dry outer layer and a wet inner layer, with low efficiency and unsatisfactory dewatering effect.

[0004] (2) The sludge lacks dynamic shear force, and the colloidal particles or fibers in the sludge are prone to entangle and form clusters, making it difficult to release the internal capillary water. Even after rotary centrifugation or high-pressure extrusion, some of the formed mud cakes still show a state of a dry outer layer and a sticky inner layer, and it is not easy to completely remove the water in the sludge. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a pickling line wastewater treatment device and a treatment method therefor, which solve the problems raised in the background art.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: A pickling line wastewater treatment device, including a water injection pool, a chemical storage tank system, an adjustment pool, a neutralization reaction pool, a coagulation sedimentation tank, a sludge thickening tank, a sludge dewatering device, a collecting pool, a purification pool, and a sludge storage bin that are connected in sequence: Among them, a housing is provided inside the sludge dewatering device; a filter frame, the filter frame is located inside the housing, and sludge enters the filter frame through a conveying pipeline; a rotating assembly, the rotating assembly is used to drive the filter frame to rotate, so that the sludge is dehydrated by centrifugal force; an extrusion filter plate, the extrusion filter plate is arranged inside the filter frame and is used to extrude the sludge; a linkage assembly, the linkage assembly is used to connect the rotating assembly and the extrusion filter plate, so that the extrusion filter plate reciprocally extrudes the sludge.

[0007] Further, a square filter plate is arranged in the middle of the upper end of the filter frame, and a heavy object block is arranged on the upper end of the square filter plate.

[0008] Further, stirring blades are rotatably installed on the left and right inner walls of the filter frame, and through grooves for passing through the stirring blades are formed on the corresponding extrusion filter plates.

[0009] Further, mounting plates are installed on the left and right inner walls of the sludge dewatering device and are located above the housing. A support column that is slidably matched with the mounting plate up and down is installed at the upper end of the housing. A telescopic spring located above the mounting plate is sleeved on the support column, and a slider that is slidably matched with the inner wall of the sludge dewatering device up and down is installed on the outside of the housing.

[0010] Further, the rotating assembly includes an external gear ring fixedly sleeved 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 with the outside of the external gear ring. A support frame that is rotatably matched with the lower end of the filter frame is installed on the inner wall of the housing.

[0011] Further, the linkage assembly includes a driving frame installed on the inner wall of the housing. A control rod that is slidably matched with the filter frame is installed on the outside of the extrusion filter plate. A ball that is slidably matched with the driving frame is installed at the end of the control rod away from the filter frame.

[0012] Further, a bevel gear one that is rotatably installed at the upper end of the housing is arranged at the upper end of the rotating gear. A bevel gear two is meshed with the rear side of the bevel gear one. An incomplete gear is installed on the bevel gear two through a rotating shaft installed above the housing. A driving motor is arranged at the upper end of the bevel gear one. A spline shaft is installed at the lower end of the output shaft of the driving motor. A sleeve that is slidably matched with the spline shaft up and down is installed at the upper end of the bevel gear one. A rack that is slidably matched with the housing up and down is installed at the upper end of the heavy object block, and the rack is meshed with the incomplete gear.

[0013] Furthermore, spiral grooves are provided on the control rods on the left and right sides, and a driving pulley mounted on the control rod is rotatably installed on the outside of the filter frame, and a sliding column adapted to the spiral groove is installed on the driving pulley. A driven pulley connected to the stirring blade is rotatably installed on the outside of the filter frame, and the driving pulley is connected to the driven pulley through a belt.

[0014] Furthermore, evenly arranged insertion rods are installed at the lower end of the square filter plate.

[0015] The present invention also provides a method for treating pickling line wastewater, which is applicable to a pickling line wastewater treatment device and comprises the following steps: Step 1: Introduce the pickling wastewater into the regulating tank for preliminary collection and homogenization of water quality and quantity.

[0016] Step 2: The regulated wastewater is transported to the neutralization reaction tank, and sodium hydroxide or lime milk is added through the reagent storage tank system to adjust the pH of the wastewater to 8-9, so that the heavy metal ions will form hydroxide precipitation.

[0017] Step 3: Add PAC and PAM in the coagulation sedimentation tank in sequence to form flocs and accelerate sedimentation, remove residual suspended matter and metal flocs, and achieve mud-water separation.

[0018] 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 moisture content.

[0019] Step 5: The concentrated sludge enters the sludge dewatering equipment, which performs rotary centrifugal and reciprocating extrusion dehydration operations on the sludge and finally forms a mud cake.

[0020] Step 6: The dehydrated mud cake is temporarily stored in the sludge storage bin and transported out for harmless disposal or resource utilization.

[0021] Step 7: The supernatant after sedimentation and the water after sludge dehydration are further treated by the filtration system and flow into the clean water pool to meet the discharge or reuse standards.

[0022] The present invention has the following beneficial effects: (1). The pickling line wastewater treatment device can significantly improve the dehydration efficiency and the solid content of the sludge cake by setting a reciprocating extrusion filter plate in a rotatable filter box, and utilizing the synergistic effect of dynamic centrifugal force and intermittent mechanical pressure. When the filter box rotates, the sludge quickly separates free water under the action of centrifugal force. At the same time, it can also avoid the problem of insufficient dehydration caused by inconsistent water content in different parts of the sludge. The reciprocating extrusion of the filter plate on the sludge can quickly form a sludge cake, which is convenient for discharge, and can also destroy the capillary structure of the sludge and extrude the bound water. The filtrate is continuously discharged through rotational movement, avoiding the "pressure attenuation" problem of traditional static pressure filtration. In addition, while the dynamic centrifugation reduces the risk of filter box blockage, the intermittent extrusion can strengthen the deep dehydration, which is beneficial to the improvement of dehydration efficiency.

[0023] (2). The pickling line wastewater treatment device adopts the synergistic effect of a square filter plate that can reciprocate up and down to pound the sludge and rotation-extrusion, which can significantly improve the dehydration efficiency. The dynamic impact force generated by high-frequency pounding destroys the internal colloidal structure and capillary bound water of the sludge, and applies a downward pressure in the vertical direction to the sludge, which is beneficial to the release of deep-bound water. At the same time, the combined design of the square filter plate and the rotary filter box strengthens the local pressure gradient to promote the rapid discharge of the filtrate and reduce the sludge residue in the filter box.

[0024] (3). The pickling line wastewater treatment device optimizes the dehydration process through multi-scale shearing with the design of synchronously linked reciprocating rotary stirring blades. The reciprocating rotation of the stirring blades can break up the sludge, prevent caking, make the sludge spread more evenly in the filter box, achieve a more thorough dehydration effect, and improve the dehydration speed. At the same time, it can also avoid the problems of sludge cake stratification or excessive compaction caused by insufficient shearing or overload in traditional equipment.

[0025] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the overall view of the present invention; Figure 2 is the three-dimensional structure schematic diagram of the sludge dewatering equipment in the present invention; Figure 3 is the internal structure schematic diagram of the sludge dewatering equipment in the present invention; Figure 4 is the present invention Figure 3 's cross-sectional plane structure schematic diagram; Figure 5 is the internal structure schematic diagram of the housing in the present invention; Figure 6 is the three-dimensional structure schematic diagram of the support column, telescopic spring and slider in the present invention; Figure 7 is the three-dimensional structure schematic diagram of the rotating component and the linkage component in the present invention; Figure 8 For the present invention Figure 7 An enlarged schematic view of area A in the present invention; Figure 9 A three-dimensional structural schematic diagram of bevel gear 1, bevel gear 2, toothed rod and incomplete gear in the present invention; Figure 10 A three-dimensional structural schematic diagram of the drive frame, control rod, driving pulley and driven pulley in the present invention; Figure 11 A three-dimensional structural schematic diagram of the extrusion filter plate, square filter plate and stirring blade in the present invention; Figure 12 A matching relationship diagram of the spiral groove and the sliding column in the present invention.

[0027] In the figure, 1, water injection pool; 2, chemical agent storage tank system; 3, regulating pool; 4, neutralization reaction pool; 5, coagulation sedimentation tank; 6, sludge thickening tank; 7, sludge dewatering equipment; 71, housing; 711, water outlet cavity; 712, water outlet; 713, water outlet pipe; 72, filter frame; 721, feed cavity; 722, conveying pipe; 723, external tooth ring; 724, rotating gear; 725, rotating frame; 726, support frame; 727, extrusion filter plate; 728, drive frame; 729, control rod; 730, ball; 731, square filter plate; 732, heavy object block; 733, insertion rod; 734, bevel gear 1; 735, bevel gear 2; 736, incomplete gear; 737, drive motor; 738, toothed rod; 739, stirring blade; 740, spiral groove; 741, driving 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, spline shaft; 762, sleeve; 763, discharge cavity; 764, automatic door; 8, collecting pool; 9, clean water pool; 10, sludge storage bin. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] The following refers to Figure 1 - Figure 12 , and describes an acid pickling line wastewater treatment device and treatment method provided by an embodiment of the present invention.

[0031] On the one hand, the present invention provides an acid pickling line wastewater treatment device.

[0032] Please refer to Figure 1 and Figure 2 , the acid pickling line wastewater treatment device includes a water injection pool 1, a chemical agent storage tank system 2, an adjustment pool 3, a neutralization reaction pool 4, a coagulation sedimentation tank 5, a sludge thickening tank 6, a sludge dewatering device 7, a collecting pool 8, a clean water pool 9, and a sludge storage bin 10 that are connected in sequence. Specifically, the chemical agent storage tank system 2 includes a sodium hydroxide storage tank, a lime milk storage tank, a PAC storage tank, and a PAM storage tank. A metering pump and a chemical addition pipeline are provided at the outlet of each storage tank and are connected to the water injection pool 1 for injecting water into the storage tank; the adjustment pool 3 is used to receive and initially collect the wastewater from the acid pickling line and perform homogenization treatment on the wastewater in terms of water quality and quantity; the neutralization reaction pool 4 is connected to the outlet end of the adjustment pool 3 and is connected to the chemical agent storage tank system 2. The chemical agent storage tank system 2 can add alkaline agents 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 for gravity thickening of the generated sludge; the sludge dewatering device 7 is connected to the bottom sludge discharge port of the sludge thickening tank 6 through a conveying pipeline 722 and is used for dewatering the thickened sludge; the collecting pool 8 is used to collect the water after sludge dewatering; the clean water pool 9 is used to collect the treated clear water; the sludge storage bin 10 is used to temporarily store the dewatered sludge and wait for external transportation or resource utilization.

[0033] Combined with Figure 3 and Figure 4 shown, wherein, a housing 71 is provided inside the sludge dewatering device 7, a filter frame 72 is arranged inside the housing 71, two left and right feed cavities 721 penetrating through the housing 71 are installed at the upper end of the filter frame 72, the feed cavities 721 are connected to the conveying pipeline 722 for conveying sludge, and the conveying pipeline 722 can convey the sludge in the sludge thickening tank 6 from the feed cavities 721 to the filter frame 72. The filter frame 72 can provide a temporary storage space for the sludge, enabling the liquid in the sludge to drain through the filter holes.

[0034] In addition, as Figures 3 - 5As shown in the figure, a water outlet chamber 711 is installed at the lower end of the housing 71. The inner wall of the water outlet chamber 711 slopes towards the direction of the water outlet 712 provided at the lower end of the sludge dewatering device 7. The water outlet 712 is connected to the collection pool 8 through a 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 is finally transported to the collection pool 8 through the water outlet pipe 713.

[0035] In order to utilize the centrifugal force to accelerate the separation of free water in the sludge and improve the dewatering efficiency, as Figure 5 , Figure 7 and Figure 9 shown, a rotating assembly for driving the filter frame 72 to rotate is also provided, so that the sludge is dehydrated under the action of centrifugal force. The rotating assembly includes an external gear ring 723 fixedly sleeved on the outer side of the upper end of the filter frame 72. An internally meshing rotating gear 724 is provided on the outer side of the external gear ring 723 and is rotatably connected to the housing 71. The drive source can drive the rotating gear 724 to rotate. When the rotating gear 724 rotates, it can drive the externally meshing external gear ring 723 to rotate synchronously. The filter frame 72 rotates synchronously with the external gear ring 723. When the filter frame 72 rotates, due to the action of centrifugal force, the free water in the sludge will be thrown out faster, accelerating the preliminary solid-liquid separation process. In addition, rotation can also make the sludge more evenly distributed in the filter frame 72, so that the entire filtering area is fully utilized instead of being concentrated in certain areas, thereby improving the overall dewatering efficiency.

[0036] Optionally, a rotating frame 725 rotatably connected to the housing 71 is installed at the upper end of the external gear ring 723. 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 precisely. At the same time, a support frame 726 rotatably matched with the lower end of the filter frame 72 is installed on the inner wall of the housing 71. The support frame 726 can provide positioning support and stable guidance for the rotation of the filter frame 72.

[0037] As Figure 11 shown, in order to further remove the capillary water and part of the bound water in the sludge, an extrusion filter plate 727 is also provided inside the filter frame 72. The extrusion filter plate 727 can reciprocally extrude the sludge during the rotating dewatering process. By applying mechanical pressure to the sludge, the moisture content of the sludge can be greatly reduced, realizing the deep dewatering of the sludge. In addition, to ensure that the extrusion filter plates 727 do not interfere with each other during the reciprocating extrusion process, the widths of the front and rear extrusion filter plates 727 are smaller than the widths of the left and right extrusion filter plates 727, and there is enough space between the extrusion filter plates 727 to accommodate the formation of the mud cake.

[0038] As Figure 5 , Figure 7 , Figure 10 and Figure 11As shown in the figure, a linkage component is also provided for connecting the rotating component and the extrusion filter plate 727. The linkage component can drive the extrusion filter plate 727 to reciprocally extrude the sludge during the sludge rotary dewatering process. The linkage component includes a driving frame 728 installed on the inner wall of the housing 71. The driving frame 728 is in the shape of a rhombus with multiple protruding segments. A control rod 729 that is slidably engaged 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. Since the driving frame 728 is in a stationary state while the control rod 729 is in a rotating state, and because the driving frame 728 is in the shape of a rhombus with multiple protruding segments, the control rod 729 during the rotation process can continuously make reciprocating contact with the protruding segments of the driving frame 728. Subsequently, the control rod 729 can drive the extrusion filter plate 727 to reciprocally move along the filter frame 72, and the two opposite extrusion filter plates 727 can synchronously extrude the sludge towards each other. The reciprocally moving extrusion filter plate 727 plays a role in dynamically pressurizing and dewatering the sludge during the rotary dewatering process. Through periodic pressurization and release, it effectively destroys the capillary structure inside the sludge, promotes the precipitation of water from the sludge, and at the same time avoids the decline 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 mud cake.

[0039] As Figure 10 and Figure 11 shown in the figure, since the control rod 729 is in a rotating state, it will cause wear between it and the driving frame 728 during rotation. Therefore, preferably, a ball 730 that is slidably engaged with the driving frame 728 is installed at the end of the control rod 729 away from the filter frame 72. The ball 730 is used to reduce the friction between the control rod 729 and the driving frame 728.

[0040] Preferably, as Figures 9 - 11 shown in the figure, a square filter plate 731 is provided in the middle of the upper end of the filter frame 72. A heavy object block 732 is provided on the upper end of the square filter plate 731. The square filter plate 731 can reciprocally pound the sludge located inside the filter frame 72 under the gravity of the heavy object block 732, further promoting the faster release of the water trapped in the sludge. Moreover, the sludge can be quickly formed under the mutual extrusion of the extrusion filter plate 727 and the square filter plate 731. In addition, a uniformly arranged insertion rod 733 is installed at the lower end of the square filter plate 731. The insertion rod 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 of the square filter plate 731 into the sludge and the drainage efficiency.

[0041] To achieve the reciprocating movement of the square filter plate 731 and the heavy object block 732, as Figures 5 - 7 and Figure 9As shown in the figure, a first bevel gear 734 rotatably mounted on the upper end of the housing 71 is provided at the upper end of the rotating gear 724. The rotating gear 724 can rotate synchronously with the first bevel gear 734. A second bevel gear 735 is engaged with the rear side of the first bevel gear 734. The second bevel gear 735 is provided with an incomplete gear 736 through a rotating shaft rotatably mounted above the housing 71. The second bevel gear 735 can convert the horizontal rotation of the first bevel gear 734 into the vertical rotation movement required by the rotating shaft. The incomplete gear 736 rotates synchronously with the rotating shaft. A driving motor 737 is provided at the upper end of the first bevel gear 734. The driving motor 737 is installed in the sludge dewatering device 7 and is used to drive the first bevel gear 734 to rotate. In addition, a rack 738 slidably engaged with the housing 71 in the vertical direction is installed at the upper end of the heavy weight 732. The rack 738 is engaged with the incomplete gear 736. A limit block 745 is installed on one side of the upper end of the rack 738 away from the teeth. The limit block 745 can limit the downward movement of the rack 738 by abutting against the housing 71 to prevent the rack 738 from moving downward excessively. When the incomplete gear 736 rotates, it can drive the rack 738 to move upward. When the rack 738 is opposite to the toothless part of the incomplete gear 736, the rack 738 disengages from the teeth of the incomplete gear 736. Under the action of the gravity of the heavy weight 732, the rack 738, the heavy weight 732 and the square filter plate 731 can quickly fall freely to pound the sludge in the vertical direction. When the rack 738 moves downward to a certain position, a part of it still remains above the housing 71. As the incomplete gear 736 continues to rotate, the incomplete gear 736 can be engaged with the rack 738 again to make the rack 738 move upward. Thus, the rack 738 can drive the heavy weight 732 and the square filter plate 731 to reciprocally pound and press the sludge up and down.

[0042] Preferably, as Figure 11 shown in the figure, stirring blades 739 are rotatably installed on the left and right inner walls of the filter frame 72. The rotation of the stirring blades 739 can further evenly distribute the sludge, destroy the sludge form through dynamic stirring, prevent sludge caking, avoid uneven dehydration caused by local accumulation, and at the same time enhance the driving force for water to precipitate from the sludge, significantly improving the solid-liquid separation effect. And, corresponding through grooves for passing through the stirring blades 739 are provided on the extrusion filter plate 727. The through grooves are used to avoid the stirring blades 739 to ensure that the reciprocating movement of the extrusion filter plate 727 is not interfered by the stirring blades 739.

[0043] While the rotary dewatering and the extrusion dewatering are carried out synchronously, in order to synchronously realize the automatic rotation of the stirring blades 739, as Figures 10 - 12As shown in the figure, spiral grooves 740 are provided on the control rods 729 on the left and right sides. An active pulley 741 sleeved on the control rod 729 is rotatably installed outside the filter frame 72. A sliding column 742 adapted to the spiral groove 740 is installed on the active pulley 741. When the control rod 729 reciprocates, the sliding column 742 can slide relative to the spiral groove 740, thereby forcing the active pulley 741 to rotate. A driven pulley 743 connected to the stirring blade 739 is rotatably installed outside the filter frame 72. The active pulley 741 is drivingly connected to the driven pulley 743 through a belt 744. When the rotating pulley rotates, it can drive the driven pulley 743 connected thereto to rotate synchronously through the belt 744. The driven pulley 743 can drive the stirring blade 739 connected thereto to rotate together. In this way, the stirring blade 739 can reciprocally rotate with the reciprocating movement of the control rod 729.

[0044] To further drain the water in the housing 71 and the filter frame 72, as Figure 3 , Figure 4 and Figure 6 shown, mounting plates 75 located above the housing 71 can also be installed on the left and right inner walls of the sludge dewatering device 7. A support column 751 that is slidably engaged with the mounting plate 75 up and down is installed at 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 not only support the housing 71 but also deform under force. Through the mounting plate 75, the support column 751 and the telescopic spring 752, the housing 71 can be elastically installed in the sludge dewatering device 7. During the process of sludge feeding or dewatering, the housing 71 may be affected by gravity or other forces, and the support column 751 moves up and down along the mounting plate 75 by squeezing or stretching the telescopic spring 752, 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 in the sludge in the filter frame 72, but also accelerate the water flow in the housing 71 towards the water outlet 712, enhancing the water discharge efficiency.

[0045] In addition, to improve the stability of the housing 71, continue to refer to Figure 3 , Figure 4 and Figure 6 . Two sliders 753 distributed left and right are also installed outside the housing 71. Guide rails 754 that are slidably engaged with the sliders 753 up and down are installed on the inner wall of the sludge dewatering device 7. The housing 71 can drive the sliders 753 to move up and down along the guide rails 754. The connection between the sliders 753 and the guide rails 754 can not only guide the up and down shaking of the housing 71, but also provide a stable moving support point for the housing 71, contributing to the increase in the stability of the housing 71.

[0046] Since the drive motor 737 is installed inside the sludge dewatering device 7, and since the housing 71 drives the parts connected thereto to slide up and down synchronously, in order to ensure that the drive motor 737 can smoothly drive the first bevel gear 734 to rotate, as Figure 8 and Figure 9 shown, a spline shaft 761 is installed at the lower end of the output shaft of the drive motor 737, and a sleeve 762 that slidably fits up and down with the spline shaft 761 is installed at the upper end of the first bevel gear 734. The sleeve 762 can slide up and down along the spline shaft 761 to ensure that the output shaft of the drive motor 737 can always drive the first bevel gear 734 that moves up and down to rotate. In addition, it should be noted that the end of the conveying pipe 722 can be telescoped as the feeding chamber 721 moves.

[0047] To achieve the discharge of the mud cake, as Figure 5 , Figure 7 and Figure 11 shown, a discharge port can be opened in the middle of the lower end of the filter frame 72. A discharge chamber 763 that penetrates the water outlet chamber 711 is installed at the lower end of the discharge port. The mud cake can be discharged through the discharge chamber 763 into the sludge storage bin 10 located inside the sludge drainage device. An automatic door 764 is provided in the discharge port. The automatic door 764 is always in a closed state during sludge dewatering. The automatic door 764 can be controlled to open and close by an existing control device (this 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 press down the formed mud cake from the discharge port into the discharge chamber 763, and the mud cake finally flows into the sludge storage bin 10.

[0048] As Figures 3 - 11 shown, during specific use (operation), first, the sludge needs to be conveyed into the filter frame 72. Subsequently, the drive motor 737 can drive the first bevel gear 734 to rotate. The first bevel gear 734 drives the rotating gear 724 to rotate synchronously. The rotating gear 724 drives the filter frame 72 to rotate synchronously through the external tooth ring 723 to perform rotational dewatering on the sludge. At the same time, under the cooperation of the control rod 729 and the drive frame 728, the extrusion filter plate 727 can reciprocally extrude the sludge in the filter frame 72 to further drain water. In addition, under the cooperative action of the driving pulley 741 and the control rod 729, the driven pulley 743 can drive the stirring blade 739 to reciprocally rotate to break the compact state of the sludge and better separate out the water. In addition, the second bevel gear 735 can rotate synchronously with the first bevel gear 734, and the incomplete gear 736 rotates synchronously through the rotating shaft. Under the cooperative action of the toothed rod 738 and the incomplete gear 736, the square filter plate 731 can reciprocally pound the sludge under the action of the heavy weight 732 to further compress the sludge block and improve the sludge dewatering efficiency. Finally, the separated water can flow into the housing 71 and flow out through the water outlet chamber 711 to the water outlet 712, and the mud cake can be discharged into the sludge storage bin 10 through the discharge port and the discharge chamber 763.

[0049] On the other hand, the present invention also provides a method for treating pickling line wastewater, which is applicable to a pickling line wastewater treatment device, and in combination with Figure 1 and Figure 2 , the method includes the following steps: Step 1: Introduce the pickling wastewater into the regulation tank 3 for preliminary collection and homogenization adjustment of water quality and water volume.

[0050] Step 2: Convey the adjusted wastewater to the neutralization reaction tank 4, and add sodium hydroxide or lime milk through the chemical agent storage tank system 2 to adjust the pH of the wastewater to 8-9, so that heavy metal ions form hydroxide precipitates.

[0051] Step 3: Add PAC and PAM successively in the coagulation sedimentation tank 5 to form flocs and accelerate sedimentation, remove residual suspended solids and metal flocs, and achieve mud-water separation.

[0052] Step 4: Convey the sludge discharged from the bottom of the coagulation sedimentation tank 5 to the sludge thickening tank 6 for gravity thickening to reduce the moisture content.

[0053] Step 5: The thickened sludge enters the sludge dewatering equipment 7, and the sludge dewatering equipment 7 performs rotary centrifugation and reciprocating extrusion dewatering operations on the sludge, and finally forms sludge cakes.

[0054] Step 6: The dewatered sludge cakes are temporarily stored in the sludge storage bin 10 and transported out uniformly for harmless treatment or resource utilization.

[0055] Step 7: The supernatant after precipitation and the water after sludge dewatering can be further treated through the filtration system and then flow into the clean water tank 9 to meet the discharge or reuse standards.

[0056] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0057] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. An acid pickling line wastewater treatment device, characterized in that, It includes a water injection pool (1), a chemical storage tank system (2), an adjustment pool (3), a neutralization reaction pool (4), a coagulation sedimentation tank (5), a sludge thickening tank (6), a sludge dewatering device (7), a collecting pool (8), a water purification pool (9), and a sludge storage bin (10) that are connected in sequence: Among them, a housing (71) is provided inside the sludge dewatering device (7); A filter frame (72), the filter frame (72) is located inside the housing (71), and sludge enters the filter frame (72) through a conveying pipe (722); A rotating assembly, the rotating assembly is used to drive the filter frame (72) to rotate, so that the sludge is dehydrated by centrifugal force; An extrusion filter plate (727), the extrusion filter plate (727) is arranged inside the filter frame (72) and is used to extrude the sludge; A linkage assembly, the linkage assembly is used to connect the rotating assembly and the extrusion filter plate (727) to make the extrusion filter plate (727) reciprocally extrude the sludge.

2. The pickling line wastewater treatment device according to claim 1, characterized in that: A square filter plate (731) is arranged in the middle of the upper end of the filter frame (72), and a heavy object block (732) is arranged on the upper end of the square filter plate (731).

3. The pickling line wastewater treatment device according to claim 1, characterized in that: Stirring blades (739) are rotatably installed on the left and right inner walls of the filter frame (72), and through grooves for passing through the stirring blades (739) are formed on the corresponding extrusion filter plates (727).

4. A pickling line wastewater treatment device according to claim 1, characterized in that: Installation plates (75) are installed on the left and right inner walls of the sludge dewatering device (7) and are located above the housing (71). A support column (751) that is slidably matched with the installation plate (75) up and down is installed at the upper end of the housing (71). A telescopic spring (752) located above the installation plate (75) is sleeved on the support column (751). A slider (753) that is slidably matched with the inner wall of the sludge dewatering device (7) up and down is installed on the outside of the housing (71).

5. The pickling line wastewater treatment device according to claim 1, wherein: The rotating assembly includes an external gear ring (723) fixedly sleeved 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) that is rotatably connected to the housing (71) is meshed with the outside of the external gear ring (723). A support frame (726) that is rotatably matched with the lower end of the filter frame (72) is installed on the inner wall of the housing (71).

6. The pickling line wastewater treatment device according to claim 5, wherein: The linkage assembly includes a driving frame (728) installed on the inner wall of the housing (71). A control rod (729) that is slidably matched with the filter frame (72) is installed on the outside of the extrusion filter plate (727). A ball (730) that is slidably matched with the driving frame (728) is installed at the end of the control rod (729) away from the filter frame (72).

7. An acid pickling line wastewater treatment device according to claim 2 or 5, characterized in that: The upper end of the rotating gear (724) is provided with a bevel gear 1 (734) rotatably mounted on the upper end of the housing (71), the rear side of the bevel gear 1 (734) is meshed with a bevel gear 2 (735), the bevel gear 2 (735) is mounted with an incomplete gear (736) via a rotating shaft rotatably mounted above the housing (71), the upper end of the bevel gear 1 (734) is provided with a driving motor (737), the lower end of the output shaft of the driving motor (737) is mounted with a spline shaft (761), the upper end of the bevel gear 1 (734) is mounted with a sleeve (762) that slides up and down with the spline shaft (761), the upper end of the weight block (732) is mounted with a gear rod (738) that slides up and down with the housing (71), and the gear rod (738) is meshed with the incomplete gear (736).

8. An acid pickling line wastewater treatment device according to claim 3 or 6, characterized in that: The control rods (729) located on the left and right sides are provided with spiral grooves (740). A driving pulley (741) sleeved on the control rod (729) is rotatably mounted on the outside of the filter frame (72). A sliding column (742) adapted to the spiral groove (740) is mounted on the driving pulley (741). A driven pulley (743) connected to the stirring blade (739) is rotatably mounted on the outside of the filter frame (72). The driving pulley (741) is connected to the driven pulley (743) through a belt (744).

9. The pickling line wastewater treatment device according to claim 2, characterized in that: Evenly arranged insertion rods (733) are installed at the lower end of the square filter plate (731).

10. A pickling line wastewater treatment method, applicable to the pickling line wastewater treatment device described in any one of claims 1 to 9, characterized in that, The following steps are involved: Step 1: Introduce the pickling wastewater into the regulating tank (3) for preliminary collection and homogenization of water quality and quantity; Step 2: The conditioned 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 the heavy metal ions are converted into hydroxide precipitation; Step 3: Add PAC and PAM in the coagulation sedimentation tank (5) in sequence 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 moisture content; Step 5: The concentrated sludge enters the sludge dewatering equipment (7), which performs rotary centrifugal and reciprocating extrusion dewatering operations on the sludge to form a sludge cake; Step 6: The dehydrated sludge cake is temporarily stored in the sludge storage bin (10) and transported out for harmless disposal or resource utilization; Step 7: The supernatant after sedimentation and the water after sludge dehydration are further treated by the filtration system and flow into the clean water tank (9) to meet the discharge or reuse standards.

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