Waste paper papermaking sewage calcium removal equipment
By designing a calcium removal tower, solid-liquid separation device, and overflow device for waste paper mill wastewater, the problem of high concentration of calcium ions in waste paper mill wastewater was solved, achieving efficient and low-cost calcium removal and improving wastewater recycling rate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-04-14
AI Technical Summary
In existing technologies, waste paper manufacturing wastewater contains high concentrations of calcium ions, leading to increased water consumption and poor environmental performance. Furthermore, existing calcium removal equipment is costly and requires a large area.
Design a calcium removal device for waste paper manufacturing wastewater, including a calcium removal tower, a solid-liquid separation device, and an overflow device. NaOH or Na2CO3 is added through a dosing pipe to react with calcium ions to form crystals. The solid-liquid separation device and the overflow device are used for separation, avoiding short-circuiting and achieving efficient and low-cost calcium removal.
It achieves efficient removal of calcium ions, reduces costs and equipment footprint, and improves the recycling and reuse efficiency of waste paper and papermaking wastewater.
Smart Images
Figure CN224118844U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater calcium removal technology, specifically to a waste paper manufacturing wastewater calcium removal device. Background Technology
[0002] In waste paper manufacturing, the raw materials themselves contain fine fibers and ink residues, which may carry calcium-based substances. During the pulping process, agents such as liquid pulp calcium, light calcium carbonate (calcium carbonate), or heavy calcium carbonate (calcium carbonate) need to be added to enhance paper properties. Furthermore, calcium hypochlorite is commonly used as a bleaching agent in the bleaching process, and unused calcium ions directly enter the wastewater. Therefore, wastewater from waste paper manufacturing often contains high concentrations of calcium ions, seriously threatening the reduction and emission reduction of clean water consumption in waste paper manufacturing.
[0003] Therefore, it is necessary to remove calcium ions from wastewater to recycle and reuse waste paper manufacturing wastewater, ensuring its reuse in paper mills and increasing the environmental friendliness of papermaking. Current technologies for calcium removal from papermaking wastewater involve using a calcium removal system to remove calcium from the secondary sedimentation effluent, requiring large-scale precipitation and crystallization equipment, which is costly and requires a large area. Utility Model Content
[0004] This invention provides a waste paper wastewater calcium removal device to achieve efficient and economical removal of calcium ions from wastewater for the purpose of recycling and reusing papermaking wastewater.
[0005] To achieve the above objectives, the technical solution of this utility model is as follows: a waste paper wastewater decalcification device is provided, the innovation of which is that it includes a decalcification tower and a support platform frame, wherein the decalcification tower is installed through the support platform frame and its lower part is fixed on the support platform frame;
[0006] The lower side of the calcium removal tower is provided with a drain port, a circulation port, and a water inlet. The water inlet is lower than the circulation port, and the circulation port is lower than the drain port. The bottom of the calcium removal tower is provided with a main drain port. The upper part of the calcium removal tower is provided with a solid-liquid separation device and an overflow device. The solid-liquid separation device is located below the overflow device. A circulation port is also provided on the side wall of the calcium removal tower between the solid-liquid separation device and the overflow device. The two circulation ports are connected by a circulation pipe. A water outlet is also provided on the side wall of the calcium removal tower above the overflow device.
[0007] It also includes a dosing pipe that extends from the top of the calcium removal tower into the tower and extends downward through the solid-liquid separation device and the overflow device.
[0008] Furthermore, the solid-liquid separation device includes several parallel separation elements, each of which is formed by three baffles in a Z shape, and each separation element is connected to the side wall of the calcium removal tower on both sides.
[0009] Furthermore, the included angle between two adjacent baffles of the separator is the baffle angle, the baffle angle ranges from 40 to 50°, the height of the separator is 600 mm, and the distance between two adjacent separators is 50 mm.
[0010] Furthermore, the overflow device includes an overflow cylinder built into the calcium removal tower, the bottom outer end of the overflow cylinder being connected to the inner wall of the calcium removal tower via a flow-blocking ring; the top of the overflow cylinder is detachably provided with a plurality of overflow components along the circumference, adjacent overflow components are fitted together and connected, and overflow blocks are uniformly provided on the overflow components.
[0011] Furthermore, the overflow component has an inverted L-shaped cross-section. A flow-blocking ring groove is provided on the outer side of the top of the overflow cylinder corresponding to the vertical portions of several overflow components. The vertical portions of the overflow components are inserted into the flow-blocking ring grooves, and the horizontal portions rest on the top surface of the overflow cylinder. A threaded hole is provided on the horizontal portion of the overflow component, and a corresponding threaded groove is provided on the upper end face of the overflow cylinder below the threaded hole. The overflow component and the overflow cylinder are connected by screws passing through the threaded holes and into the threaded grooves. Overflow blocks are evenly distributed on the outer side of the upper surface of the horizontal portion of the overflow component.
[0012] Furthermore, the overflow block is semi-circular or isosceles trapezoidal in shape.
[0013] Furthermore, the calcium removal tower is divided into a first reaction section, a second reaction section, and a solid-liquid separation section from bottom to top, with the diameters of the first reaction section, the second reaction section, and the solid-liquid separation section gradually increasing; the solid-liquid separation device and the overflow device are located in the solid-liquid separation section, and the water inlet, the drain outlet, and the circulation port located below are located on the first reaction section.
[0014] Furthermore, the bottom of the dosing tube extends to the bottom of the second reaction section.
[0015] Furthermore, it also includes an inspection port and a sampling port, which are located on the side of the second reaction section.
[0016] Furthermore, there are two discharge ports, which are symmetrically located on the side of the first reaction section.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0018] This utility model discloses a calcium removal device for waste paper manufacturing wastewater. The calcium removal tower is fixed on a supporting platform. During operation, wastewater is discharged into the tower through the inlet, and NaOH or NaOH and Na2CO3 are added through the dosing port. These react with calcium ions in the wastewater to form crystals. The crystals are directly adsorbed onto suspended solids in the water. As the particles gradually grow, they are eventually discharged from the outlet. The reacted liquid flows upwards through a solid-liquid separation device and an overflow device before being discharged from the outlet. This utility model's calcium removal device is highly efficient, low-cost, and space-saving.
[0019] The calcium removal equipment of this invention is equipped with a solid-liquid separation device and an overflow device to separate the liquid after the reaction and the crystals formed by the reaction, and to discharge water evenly through the overflow device to avoid short-flow phenomenon in the fluidized bed in the calcium removal tower. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This utility model relates to an overall calcium removal device for waste paper manufacturing wastewater.
[0021] Figure 2 This is a perspective view of the solid-liquid separation device and overflow device of this utility model.
[0022] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the image.
[0023] Figure 4 For the present utility model Figure 3 The overflow block in the diagram is an isosceles trapezoidal shape.
[0024] Figure 5 This is a top structural diagram of the overflow cylinder of this utility model.
[0025] Figure 6 This is a first vertical cross-sectional view of the connection between the overflow component and the overflow cylinder of this utility model.
[0026] Figure 7 This is a second vertical cross-sectional view of the connection between the overflow component and the overflow cylinder of this utility model.
[0027] The components are as follows: 1. Calcium removal tower; 11. First reaction section; 12. Second reaction section; 13. Solid-liquid separation section; 2. Support platform frame; 3. Drainage port; 4. Circulation port; 5. Water inlet; 6. Main discharge port; 7. Solid-liquid separation device; 71. Separator; 72. Baffle plate; 8. Overflow device; 81. Overflow cylinder; 82. Flow isolation ring; 83. Overflow component; 84. Overflow block; 85. Flow interception ring groove; 86. Threaded hole; 87. Threaded groove; 88. Screw; 9. Circulation pipe; 10. Dosing pipe; 14. Inspection port; 15. Sampling port; 16. Water outlet. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0029] Example 1: This example provides a calcium removal device for waste paper manufacturing wastewater, such as... Figure 1 As shown, it includes a calcium removal tower 1 and a support platform frame 2. The calcium removal tower 1 is installed through the support platform frame 2 and its lower part is fixed on the support platform frame 2.
[0030] The lower side of the calcium removal tower 1 is provided with a drain port 3, a circulation port 4 and a water inlet 5. The water inlet 5 is lower than the circulation port 4, and the circulation port 4 is lower than the drain port 3. The bottom of the calcium removal tower 1 is provided with a main drain port 6. The upper part of the calcium removal tower 1 is provided with a solid-liquid separation device 7 and an overflow device 8. The solid-liquid separation device 7 is located below the overflow device 8. The side wall of the calcium removal tower 1 between the solid-liquid separation device 7 and the overflow device 8 is also provided with a circulation port 4. The two circulation ports 4 are connected by a circulation pipe 9. The side wall of the calcium removal tower 1 above the overflow device 8 is also provided with a water outlet 16.
[0031] It also includes a dosing pipe 10, which extends from the top of the calcium removal tower 1 into the calcium removal tower 1 and passes through the solid-liquid separation device 7 and the overflow device 8 and extends downward.
[0032] In this embodiment, water valves can be installed on the drain port 3, circulation port 4, inlet port 5, and outlet port, which can be opened and closed as needed. Furthermore, to circulate wastewater from circulation port 4 to the area below the overflow device 8 for further reaction and to improve the completeness of calcium removal, a water pump is installed on the circulation pipe 9. The configuration of the water pump and water valves is prior art and is not shown in the accompanying drawings of this embodiment.
[0033] The purpose of setting the main outlet 6 is to prevent bottom particles from not being discharged for a long time during the calcium removal process, and from becoming longer and larger and affecting the flow rate inside the tower. The particles are discharged through the main outlet 6.
[0034] In this embodiment, the calcium removal tower 1 is fixed on the support platform frame 2. During use, wastewater is discharged into the calcium removal tower 1 through the inlet 5, and chemicals (or a mixture of calcium carbonate and magnesium carbonate) are added through the dosing port (the dosage is determined based on the alkalinity of the wastewater; when alkalinity is sufficient, it is added through the dosing pipe 10 inside the equipment; when alkalinity is insufficient, chemicals are added simultaneously). This converts the bicarbonate alkalinity in the water into carbonate alkalinity, which reacts with the hardness ions calcium and magnesium in the water to form calcium carbonate and magnesium carbonate crystals. These crystals are directly adsorbed onto the suspended solids in the water. As the particles gradually grow, they are eventually discharged from the outlet 3. The reacted liquid flows upward through the solid-liquid separation device 7 and the overflow device 8 before being discharged from the outlet. The calcium removal equipment in this embodiment is highly efficient, low-cost, and occupies little space.
[0035] The calcium removal equipment in this embodiment is equipped with a solid-liquid separation device 7 and an overflow device 8 to separate the liquid after the reaction and the crystals formed by the reaction, and to uniformly discharge water through the overflow device 8 to avoid short-flow phenomenon in the fluidized bed in the calcium removal tower 1.
[0036] Example 2: Based on the above examples, in order to achieve solid-liquid separation, such as... Figure 2 As shown, the solid-liquid separation device 7 of this embodiment includes several parallelly arranged separation elements 71. Each separation element 71 is formed by three baffles 72 in a Z shape, and each separation element 71 is connected to the side wall of the calcium removal tower 1 on both sides.
[0037] In this embodiment, the Z-shaped separator 71 is formed by three baffles 72, which can effectively block the crystals during the liquid rise process and prevent a large number of crystals from being discharged from the outlet as the liquid rises.
[0038] Example 3: Based on the above examples, in this example, the included angle between two adjacent baffles 72 of the separator 71 is the baffle angle, the angle range of which is 40-50°, the height of the separator 71 is 600mm, and the distance between two adjacent separators 71 is 50mm.
[0039] In this embodiment, the spacing, height, and baffle angle of the separators 71 are set to further enhance the separation effect of the solid-liquid separation device 7. Flocculent matter that does not form crystals during calcium ion reactions will adhere to the space between the separators 71 on the inclined plate. If the spacing between the separators 71 is too small, it will cause blockage and affect the upward discharge of the liquid.
[0040] Example 4: Based on the above examples, the overflow device 8 in this example includes an overflow cylinder 81 built into the calcium removal tower 1, such as... Figure 2 and 3 As shown, the bottom outer end of the overflow cylinder 81 is connected to the inner wall of the calcium removal tower 1 through the flow isolation ring 82; several overflow parts 83 are detachably provided along the circumference of the top of the overflow cylinder 81, and adjacent overflow parts 83 are fitted together and connected, and overflow blocks 84 are evenly provided on the overflow parts 83.
[0041] In this embodiment, when the overflow device 8 is used, the liquid flows upward from the overflow cylinder 81 and overflows from between the overflow blocks 84 on the overflow component 83, and finally is discharged from the outlet, preventing full water and protecting the equipment safety.
[0042] Example 5: Based on the above examples, in order to make the overflow component 83 detachable, the cross-section of the overflow component 83 in this example is inverted L-shaped, as shown below. Figure 5-7 As shown, the top outer side of the overflow cylinder 81 has a flow-blocking ring groove 85 corresponding to the vertical parts of several overflow components 83. The vertical parts of the overflow components 83 are inserted into the flow-blocking ring groove 85, and the horizontal parts are placed on the top surface of the overflow cylinder 81. The horizontal part of the overflow component 83 has a threaded hole 86. The upper end face of the overflow cylinder 81 below the threaded hole 86 has a corresponding threaded groove 87. The overflow component 83 and the overflow cylinder 81 are connected by a screw 88 passing through the threaded hole 86 and connected to the threaded groove 87. Overflow blocks 84 are evenly distributed on the outer side of the upper surface of the horizontal part of the overflow component 83.
[0043] In this embodiment, the calcium removal tower 1 may tilt when it is installed on the support platform frame 2 or the overflow device 8 is installed inside the calcium removal tower 1. Also, when water is introduced into the calcium removal tower 1 and crystals are formed, the calcium removal tower 1 may tilt due to uneven weight distribution inside the tower, resulting in uneven water output from the overflow device 8 and short-flow phenomenon in the fluidized bed inside the tower. To avoid this phenomenon, several overflow components 83 are detachably installed on the overflow cylinder 81. The height of the overflow components 83 can be adjusted according to the possible tilt, that is, adjusted so that each overflow block 84 is at the same height, ensuring uniform water overflow from the overflow device 8.
[0044] In this embodiment, the height of the overflow component 83 is adjusted as follows: when the overflow component 83 is fixed to the overflow cylinder 81 by the screw 88, the distance between the horizontal part of the overflow component 83 and the overflow cylinder 81 is adjusted to adjust the height of the overflow component 83. Specifically, the screw 88 can be screwed into the horizontal part of the overflow component 83 until the overflow component 83 is screwed into the screw 88 a certain distance, and then the screw 88 is screwed downward into the threaded groove 87.
[0045] Example 6: Based on the above examples, the overflow block 84 in this example is semi-circular or isosceles trapezoidal in shape, such as... Figure 3 and 4 As shown, either a semicircle or an isosceles trapezoid can form an overflow port between adjacent overflow blocks 84 for overflow.
[0046] Example 7: Based on the above examples, the calcium removal tower 1 in this example is divided into a first reaction section 11, a second reaction section 12 and a solid-liquid separation section 13 from bottom to top. The diameters of the first reaction section 11, the second reaction section 12 and the solid-liquid separation section 13 gradually increase. The solid-liquid separation device 7 and the overflow device 8 are provided in the solid-liquid separation section 13. The water inlet 5, the discharge port 3 and the circulation port 4 located below are provided on the first reaction section 11.
[0047] In this embodiment, the first reaction section 11 and the second reaction section 12 mainly perform a calcium removal mixing reaction, while the solid-liquid separation section 13 mainly performs solid-liquid separation and drainage.
[0048] Example 8: Based on the above examples, in order to improve reaction efficiency and the comprehensiveness of the reaction, the bottom of the dosing tube 10 in this example extends to the bottom of the second reaction section 12. The lower end of the dosing tube 10 allows the substances entering from the dosing tube 10 to better and more comprehensively contact and react with the influent, thereby improving calcium removal efficiency.
[0049] Example 9: Based on the above examples, this example further includes an inspection port 14 and a sampling port 15, which are located on the side of the second reaction section 12. The inspection port 14 is provided to facilitate maintenance of the calcium removal tower 1 by the staff. The sampling port 15 is provided to observe the crystallization situation inside the tower and to facilitate the discharge of crystallized particles from the drain port 3 according to the time nodes.
[0050] Example 10: Based on the above examples, in order to discharge the crystal particles as quickly as possible when needed, the number of discharge ports 3 in this example is two, and the two discharge ports 3 are symmetrically arranged on the side of the first reaction part 11.
[0051] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the concept and scope of the present utility model. Without departing from the design concept of the present utility model, all modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope of the present utility model. The technical content for which protection is sought in the present utility model has been fully described in the technical requirements.
Claims
1. A waste paper mill wastewater calcium removal device, characterized in that: It includes a calcium removal tower and a support platform frame, wherein the calcium removal tower is installed through the support platform frame and its lower part is fixed on the support platform frame; The lower side of the calcium removal tower is provided with a drain port, a circulation port, and a water inlet. The water inlet is lower than the circulation port, and the circulation port is lower than the drain port. The bottom of the calcium removal tower is provided with a main drain port. The upper part of the calcium removal tower is provided with a solid-liquid separation device and an overflow device. The solid-liquid separation device is located below the overflow device. A circulation port is also provided on the side wall of the calcium removal tower between the solid-liquid separation device and the overflow device. The two circulation ports are connected by a circulation pipe. A water outlet is also provided on the side wall of the calcium removal tower above the overflow device. It also includes a dosing pipe that extends from the top of the calcium removal tower into the tower and extends downward through the solid-liquid separation device and the overflow device.
2. The waste paper wastewater calcium removal equipment according to claim 1, characterized in that: The solid-liquid separation device includes several parallel separation components. Each separation component is formed by three baffles in a Z shape, and each separation component is connected to the side wall of the calcium removal tower on both sides.
3. The waste paper wastewater calcium removal equipment according to claim 2, characterized in that: The included angle between two adjacent baffles of the separator is the baffle angle, which ranges from 40 to 50°. The height of the separator is 600 mm, and the distance between two adjacent separators is 50 mm.
4. The waste paper wastewater calcium removal equipment according to claim 1 or 2, characterized in that: The overflow device includes an overflow cylinder built into the calcium removal tower. The bottom outer end of the overflow cylinder is connected to the inner wall of the calcium removal tower through a flow-blocking ring. Several overflow components are detachably provided on the top of the overflow cylinder along the circumference. Adjacent overflow components are fitted together and connected. Overflow blocks are evenly provided on the overflow components.
5. The waste paper wastewater calcium removal equipment according to claim 4, characterized in that: The overflow component has an inverted L-shaped cross-section. The top outer side of the overflow cylinder has several vertical sections of the overflow components with downward-facing intercepting ring grooves. The vertical sections of the overflow components are inserted into the intercepting ring grooves, and the horizontal sections rest on the top surface of the overflow cylinder. The horizontal section of the overflow component has a threaded hole, and the upper end face of the overflow cylinder below the threaded hole has a corresponding threaded groove. The overflow component and the overflow cylinder are connected by screws passing through the threaded holes and into the threaded grooves. Overflow blocks are evenly distributed on the outer side of the upper surface of the horizontal section of the overflow component.
6. The waste paper wastewater calcium removal equipment according to claim 5, characterized in that: The overflow block is semi-circular or isosceles trapezoidal in shape.
7. The waste paper wastewater calcium removal equipment according to claim 1, characterized in that: The calcium removal tower is divided into a first reaction section, a second reaction section, and a solid-liquid separation section from bottom to top, with the diameters of the first reaction section, the second reaction section, and the solid-liquid separation section gradually increasing; the solid-liquid separation device and the overflow device are located in the solid-liquid separation section, and the water inlet, the drain outlet, and the circulation port located below are located on the first reaction section.
8. The waste paper wastewater calcium removal equipment according to claim 7, characterized in that: The bottom of the dosing tube extends to the bottom of the second reaction section.
9. The waste paper wastewater calcium removal equipment according to claim 7, characterized in that: It also includes an inspection port and a sampling port, which are located on the side of the second reaction section.
10. The waste paper wastewater calcium removal equipment according to claim 7, characterized in that: The number of discharge ports is two, and the two discharge ports are symmetrically arranged on the side of the first reaction part.