A stratified co-current inclined plate sedimentation tank with vector-driven mud-water separation

Abstract

The present invention discloses a stratified co-directional flow inclined plate sedimentation tank for vector-driven mud-water separation. Structurally, the upward flow of the mud-water mixture is changed to a horizontal flow, thereby significantly improving the efficiency of mud-water separation in the inclined plate mud-water separation tank. Secondly, in terms of structure and flow state, the two dead zones existing in the upward flow inclined plate mud-water separation tank are eliminated, thereby significantly improving the effective utilization space of the inclined plate mud-water separation tank from 70% to 100%. The mud discharge port of each section of the segmented inclined ditch structure can realize the separation of sewage horizontal flow and mud collection sliding in stages, because the vector-driven force of the horizontal flow sewage can realize the high efficiency of mud-water separation. As a receiving structure of the inclined ditch mud discharge port, an independent mud slide trough is arranged under the segmented mud discharge port to realize the spatial separation of horizontal flow and mud collection sliding, which can eliminate the interference of horizontal flow sewage on settled sludge.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a stratified co-current inclined plate sedimentation tank for vector-driven mud-water separation. Background Art

[0002] As a structure for removing suspended solids from water, mud-water separation tanks are widely used in water supply and wastewater treatment projects. Based on the direction of water flow within the tank, mud-water separation tanks can be divided into three types: horizontal flow, vertical flow, and radial flow. Horizontal flow separation tanks are widely used due to their simple structure and excellent sedimentation effects, but they also have disadvantages such as low efficiency and large footprint. Due to the ideal operating characteristics of horizontal flow separation tanks, once sludge enters the tank, it can either flow horizontally with the water flow or sink vertically due to gravity.

[0003] When the sludge sinks to the bottom of the advection tank, it is considered to be removed by sedimentation. Under the conditions of a given tank length and horizontal flow rate, the depth of the mud-water separation tank is inversely proportional to the sludge sedimentation efficiency. This is the shallow tank theory.

[0004] Based on the shallow pool theory, relatively efficient inclined tube and inclined plate mud-water separation tanks were developed. However, both types of mud-water separation tanks have problems such as easy clogging and unstable effluent quality. Regarding the inclined plate mud-water separation tank alone, when the sludge settles to the surface of the inclined plate, it can theoretically be considered to have been removed. However, some of the settled sludge may also slide down the long inclined plate, and due to the dual effects of excessive sludge accumulation and interference from the reverse flow, it may become suspended sludge again. Therefore, from the perspective of the actual operation of the inclined plate mud-water separation tank project, the sludge that settles to the surface of the inclined plate does not mean that it has been removed, and the length of the inclined plate's sliding path is often proportional to the degree of interference with the sliding sludge. Existing inclined plate mud-water separation tanks have problems such as an excessively long sludge sliding path, significant interference from the reverse flow, and easy sludge accumulation and blockage.

[0005] In order to solve this technical problem existing in the existing inclined plate mud-water separation tank, the existing technology has improved the sedimentation timeliness of the sludge to a certain extent after taking measures such as applying new materials, improving the flocculation process, and rationally designing the water distribution device, but it is difficult to fundamentally solve all the problems existing therein. Summary of the Invention

[0006] The purpose of the present invention is to provide a stratified co-current inclined plate sedimentation tank with vector-driven mud-water separation, which aims to solve the following problems:

[0007] (1) In the existing inclined plate mud-water separation tank, mud and water are separated in the same separation channel in space. The rising water flow and the descending sludge flow in the same channel are in different directions, causing turbulence in the system, which in turn interferes with each other and makes it difficult to obtain efficient and stable sludge removal.

[0008] (2) Most existing inclined plate mud-water separation tanks have multiple ineffective areas (dead zones), which result in high manufacturing and infrastructure costs and make it difficult to achieve effective space utilization; dead zones are prone to sludge deposition and are difficult to remove, often causing blockages.

[0009] (3) The existing inclined plate mud-water separation tank relies solely on the gravity of the sludge itself to achieve slow free descent. The mud-water separation effect is greatly affected by the hydraulic retention time, the particle size of the sludge flocs and external interference, and the timeliness of the mud-water separation is low.

[0010] (4) There is no independent sludge collection space, which causes the settled sludge to be disturbed by turbulence and return to the sewage.

[0011] The present invention provides a stratified co-directional flow inclined plate sedimentation tank for vector-driven mud-water separation, comprising two boxes surrounded by a rhombus and a rectangle, a water distribution area being provided on the left side of the box, a plurality of water inlet holes being provided on the left side of the water distribution area, a clean water area being provided on the other side, a plurality of water outlet holes being provided on the right side of the clean water area, a plurality of groups of mud sliding components being proportionally reduced in size to the shape of the box being provided in the box, each of the mud sliding components being composed of a mud sliding inclined plate with a thickness of 5 cm and a mud sliding inclined groove being obtained by an oblique downward groove being provided on the mud sliding inclined plate; 7-8 sections of mud sliding components distributed at equal intervals of 20 cm form a mud sliding plane; a 15 cm high protective height is provided on all sides of the box; a funnel-shaped sludge area is also provided below the box, and a sludge sedimentation area is formed by adapting the sludge area and the box through a buffer zone; a mud discharge pipe is provided at the bottom of the sludge area.

[0012] Preferably, the mud slope groove has a depth of 4 cm and a width of 3 cm.

[0013] Preferably, a mud collection and sliding area and a clear water area are provided in sequence between the right side of the mud sliding assembly and the water outlet.

[0014] Preferably, a water distribution area is provided between the mud sliding assembly and the water inlet hole.

[0015] Preferably, the angle between the mud sliding inclined plate and the mud sliding inclined groove and the horizontal direction is 60°.

[0016] Preferably, the mud sliding assembly is the side wall of the box in the water inlet direction, and the angle between the buffer zone and the bottom surface of the box is 60°.

[0017] Preferably, the box body, buffer zone and sludge zone can be integrally formed of building materials or metal materials, and the sludge sliding component can be integrally formed of building materials or stainless steel materials and arranged in the box body. The material of the sludge sliding component is consistent with the selection of the box body, and it is set at a certain height difference to facilitate the discharge and transportation of sludge from the sewage pipe.

[0018] Preferably, the sludge sliding assembly is used to achieve the horizontal flow of sewage and the sliding separation of sludge collection in stages, the width of the sludge collection sliding area is 20 cm, the width of the clear water area is 40 cm, and the height of the sludge buffer area is ≥45 cm.

[0019] Preferably, the sedimentation tanks are distributed in multiple groups with an interval of 2.5m.

[0020] Preferably, a protective height is provided on the periphery of the box body, which is made of the same material as the box body, and the uppermost portion is left hollow, so as to prevent overflow caused by changes in the flow rate of the mud-water mixture in the box body; and to promptly discharge carbon dioxide, methane and a small amount of hydrogen, nitrogen and hydrogen sulfide and other gases generated by anaerobic digestion of sludge settled at the bottom of the sludge area (3) during long-term operation of the box body (1), so as to prevent deformation or explosion of the box body.

[0021] Advantages of the present invention:

[0022] First, the present invention changes the structure of sewage upflow (or radial flow) to horizontal flow, significantly improving the efficiency of mud-water separation in the inclined plate mud-water separation tank;

[0023] Secondly, from the perspective of structure and flow pattern, the two dead zones existing in the upflow inclined plate mud-water separation tank are eliminated, thereby significantly improving the effective utilization space of the inclined plate mud-water separation tank (from 70% to 100%);

[0024] Furthermore, the segmented inclined ditch structure designed in the present invention can achieve the horizontal flow of sewage and the downward separation of collected mud in stages at the mud discharge port of each segment of the inclined ditch. Due to the vectorial driving force of the horizontal flow of sewage, the mud-water separation can be highly efficient.

[0025] Fourth, as the receiving structure for the inclined ditch discharge port, an independent mud chute is installed below the segmented discharge port. By spatially separating horizontal flow from the sludge collection and descent, it eliminates interference of horizontal flow with settled sludge. This is a feature that other mud-water separation tanks cannot replace in the short term, and it will also ensure a long-term and stable market for the promotion and application of this technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a vector-driven mud-water separation stratified co-directional flow inclined plate sedimentation tank provided in an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of a single-layer sliding mud assembly provided in an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the mud and water flow during operation provided by an embodiment of the present invention.

[0029] Among them, 1. Box body, 11. Water distribution area; 111. Water inlet hole; 12. Mud collection and sliding area; 13. Clean water area; 131. Buffer zone; 14. Protection height; 2. Mud sliding assembly; 21. Mud sliding inclined plate; 22. Mud sliding inclined hook; 3. Sludge area; 31. Buffer zone; 32. Sludge sedimentation area; 33. Mud discharge pipe. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited in any way. Any changes or substitutions made based on the teachings of the present invention fall within the scope of protection of the present invention.

[0031] Example 1

[0032] The present embodiment provides a stratified co-current inclined plate sedimentation tank for vector-driven mud-water separation, comprising two boxes 1 surrounded by a rhombus and a rectangle, a water distribution area 11 being provided on the left side of the box 1, a plurality of water inlet holes 111 being provided on the left side of the water distribution area 11, a clean water area 13 being provided on the other side, a plurality of water outlet holes 131 being provided on the right side of the clean water area 13, a plurality of groups of mud sliding components 2 being proportionally reduced in shape to the box 1 being provided in the box 1, each of the mud sliding components 2 being composed of a mud sliding inclined plate 21 with a thickness of 5 cm and a mud sliding inclined groove 22 being obtained by an oblique downward groove being provided on the mud sliding inclined plate 21; 7-8 sections of mud sliding components 2 distributed at equal intervals of 20 cm form a mud sliding plane; a 15 cm high protective height 14 is provided on all sides of the box 1; a funnel-shaped sludge area 3 is also provided below the box 1, and a buffer zone 31 is adapted between the sludge area 3 and the box 1 to form a sludge sedimentation area 32; a mud discharge pipe 33 is provided at the lower part of the sludge area 3.

[0033] The depth of the mud slope groove 22 is 4 cm and the width is 3 cm.

[0034] A mud collecting and sliding area 12 and a clear water area 13 are sequentially provided between the right side of the mud sliding assembly 2 and the water outlet 131 .

[0035] A water distribution area 11 is provided between the mud sliding assembly 2 and the water inlet 111 .

[0036] The angle between the mud sliding inclined plate 21 and the mud sliding inclined groove 22 and the horizontal direction is 60°.

[0037] The mud sliding assembly 2 is the side wall of the box body 1 in the water inlet direction, and the angle between the buffer zone 31 and the bottom surface of the box body 1 is 60°.

[0038] The box body 1, buffer zone 31 and sludge zone 3 can be integrally formed of building materials or metal materials. The sludge sliding assembly 2 is integrally formed of building materials or stainless steel materials and is arranged in the box body 1. The material of the sludge sliding assembly 2 is consistent with that of the box body 1. When it is set, it is at a position with a certain height difference to facilitate the discharge and transportation of sludge from the sewage pipe 33.

[0039] The sludge sliding assembly 2 is used to realize the horizontal flow of sewage and the sliding separation of sludge collection in stages. The width of the sludge collection sliding area 12 is 20 cm, the width of the clear water area 13 is 40 cm, and the height of the sludge buffer area is ≥45 cm.

[0040] The sedimentation tanks are distributed in groups with an interval of 2.5 meters.

[0041] The outer periphery of the box body 1 is provided with a protective height 14, which is made of the same material as the box body 1, and the uppermost part is left hollow, which is used to prevent overflow caused by changes in the flow rate of the mud-water mixture in the box body 1; timely discharge carbon dioxide, methane and a small amount of hydrogen, nitrogen and hydrogen sulfide and other gases generated by anaerobic digestion of sludge settled at the bottom of the sludge area 3 during long-term operation of the box body 1, to prevent deformation or explosion of the box body 1.

[0042] The working principle of the present invention is to change the upward flow of sewage into a horizontal flow, so as to eliminate the interference of the rising water flow on the settling sludge in the traditional inclined plate mud-water separation tank; make full use of the vectorial driving force of the horizontal flow sewage to achieve the effectiveness of spatial separation of the water flow and the settling sludge on the inclined plate; realize the spatial separation of the horizontal water flow and the sliding of the sludge collection, and achieve high efficiency of sludge removal by eliminating the interference of the water flow on the sludge settling.

[0043] The present invention has the following four advantages: 1) Structurally, the upward flow (or downward flow) of sewage is changed to a horizontal flow, which significantly improves the efficiency of mud-water separation in the inclined plate mud-water separation tank by eliminating the mutual interference between sludge and water flow; 2) From the structural and flow state perspectives, the two dead zones existing in the upward flow inclined plate mud-water separation tank are eliminated, thereby significantly improving the effective utilization space of the inclined plate mud-water separation tank; 3) The designed segmented inclined ditch structure, the mud discharge port of each segment of the inclined ditch can realize the horizontal flow of sewage and the downward flow of collected mud in stages, because the vector driving force of the horizontal flow sewage can realize the effectiveness of mud-water separation; 4) As the receiving structure of the inclined ditch mud discharge port, an independent mud slide trough is arranged under the segmented mud discharge port, because the spatial separation of horizontal flow and collected mud is realized, the interference of horizontal flow sewage on the settled sludge can be eliminated.

[0044] Only its infrastructure and operating costs are analyzed:

[0045] Compared with conventional inclined plate mud-water separation tanks, the addition of a mud-sliding ditch and an independent mud collection area increases capital construction costs by 0.5%. However, structural analysis shows that this invention fully utilizes the tank space by eliminating the dead zone in conventional inclined plate mud-water separation tanks, converting the approximately 25% dead zone volume into effective use. This reduces capital construction costs by 25%. Combined, these two factors result in a 24.5% reduction in capital construction costs.

[0046] During operation, the driving force of the horizontal flow vector is fully utilized, which can indefinitely extend the operating period of the vector-driven mud-water separation stratified co-directional flow inclined plate mud-water separation tank. At least, by solving the mud accumulation and blockage problem, the system maintenance cost is reduced to 0.6 of the maintenance cost of a traditional inclined plate mud-water separation tank. If maintenance costs account for 40% of operating costs, the operating cost can be saved by about 16%.

[0047] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A vector-driven stratified co-current inclined plate sedimentation tank for mud-water separation, characterized by: The invention comprises two boxes (1) formed by a rhombus and a rectangle, wherein a water distribution area (11) is provided on the left side of the box (1), and a plurality of water inlet holes (111) are provided on the left side of the water distribution area (11); a clear water area (13) is provided on the other side, and a plurality of water outlet holes (131) are provided on the right side of the clear water area (13); a plurality of groups of sliding mud assemblies (2) with a reduced size in proportion to the shape of the box (1) are provided in the box (1), and each of the sliding mud assemblies (2) is composed of a sliding mud inclined plate (21) with a thickness of 5 cm. The mud inclined plate (21) is provided with a downwardly inclined groove to obtain a mud inclined groove (22); 7-8 sections of mud components (2) are distributed at an equal interval of 20 cm to form a mud plane; a 15 cm high protective height (14) is provided on all sides of the box (1); a funnel-shaped mud area (3) is further provided below the box (1), and a buffer zone (31) is adapted between the mud area (3) and the box (1) to form a mud settling area (32); a mud discharge pipe (33) is provided at the bottom of the mud area (3); The depth of the mud slope groove (22) is 4 cm and the width is 3 cm; A mud collection and sliding area (12) and a clear water area (13) are sequentially provided between the right side of the mud sliding assembly (2) and the water outlet (131); A water distribution area (11) is provided between the mud slide assembly (2) and the water inlet hole (111); The angle between the mud sliding inclined plate (21) and the mud sliding inclined groove (22) and the horizontal direction is 60°; The sliding mud assembly (2) is the side wall of the box (1) in the water inlet direction, and the angle between the buffer zone (31) and the bottom surface of the box (1) is 60°; The housing (1), the buffer zone (31) and the sludge zone (3) can be integrally formed of building materials or metal materials. The sludge sliding assembly (2) is integrally formed of building materials or stainless steel materials and is arranged in the housing (1). The material of the sludge sliding assembly (2) is selected to be consistent with that of the housing (1). When the sludge sliding assembly (2) is arranged at a position with a certain height difference, it is convenient for the sludge to be discharged and transported from the sewage pipe (33); The mud sliding assembly (2) is used to achieve the horizontal flow of the mud-water mixture and the separation of the mud collection sliding zone in stages. The width of the mud collection sliding zone (12) is 20 cm, the width of the clear water zone (13) is 40 cm, and the height of the sludge buffer zone is ≥45 cm.

2. The vector-driven stratified co-current inclined plate sedimentation tank for mud-water separation according to claim 1 is characterized by: The sedimentation tanks are distributed in multiple groups with an interval of 2.5m.

3. The vector-driven stratified co-current inclined plate sedimentation tank for mud-water separation according to claim 1 is characterized by: The outer periphery of the box (1) is provided with a protective height (14), which is made of the same material as the box (1), and the uppermost portion is left hollow, and is used to prevent overflow caused by changes in the flow rate of the mud-water mixture in the box (1); timely discharge carbon dioxide, methane and a small amount of hydrogen, nitrogen and hydrogen sulfide gas generated by anaerobic digestion of sludge settled at the bottom of the sludge area (3) during long-term operation of the box (1), and prevent deformation or explosion of the box (1).

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