An inclined plate settling device for the settling of sodium aluminate desiliconization sludge

Abstract

This utility model discloses an inclined plate settling device for the settling of sodium aluminate desiliconization sludge, belonging to the field of wastewater treatment technology. It includes: a sedimentation tank, with an inclined plate settling zone and a turbulence zone from top to bottom, and a sludge hopper at the bottom of the sedimentation tank; a settling assembly installed in the inclined plate settling zone to promote sludge floc collision and aggregation; a turbulence assembly rotatably disposed in the turbulence zone; a drive mechanism for driving the turbulence ring to rotate at a low speed of 3-10 rpm, forming a circulating flow field with a central downward flow and an outer peripheral upward flow within the turbulence zone; and a return pipe with its inlet located in the upper middle part of the turbulence zone and its outlet connected to the front-end reaction tank, and a sludge screw pump installed on the return pipe. This inclined plate settling device, with its turbulence assembly rotating to form a circulating flow field with a central downward flow and an outer peripheral upward flow, utilizes the physical difference between activated sludge and dead sludge to achieve precise separation. Through precise separation, the reused sludge has a high proportion of active components.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to an inclined plate settling device for the settling of sodium aluminate desiliconization sludge. Background Technology

[0002] In industrial sectors such as coal chemical engineering, mine water treatment, and coking wastewater treatment, the efficient treatment of silicon-containing wastewater is crucial for ensuring stable production and environmental compliance. Traditional sodium aluminate desiliconization processes, relying on their chemical reaction mechanism, can effectively remove silicon from water. However, this process faces significant technical bottlenecks in the sludge treatment stage: the generated silica gel particles, due to their small size and high dispersibility, exhibit extremely poor settling performance, resulting in low sludge-water separation efficiency. This not only increases the risk of fouling in subsequent dual-membrane systems.

[0003] Meanwhile, the sludge produced by hardening processes (such as lime softening) (mainly composed of CaCO3 and Mg(OH)2) has high settling properties, and its crystal structure surface characteristics can theoretically act as crystal nuclei, promoting the flocculation and settling of silica gel. However, existing technologies for utilizing hardening sludge have the following shortcomings:

[0004] In addition to the fact that hard sludge is directly treated as waste and discharged, its high settling performance and crystal nucleation effect are not fully utilized, resulting in resource waste, the discharge and disposal of sludge also increases the environmental protection costs of enterprises.

[0005] Existing sedimentation tanks rely on natural settling and the location of the sludge hopper to distinguish between activated sludge and dead sludge that can serve as crystal nuclei. The separation effect is not good, and the proportion of dead sludge mixed in with the activated sludge is relatively high, which leads to a decrease in the activity of the reused sludge, affects the stability of the sludge concentration in the upstream silica flocculant tank, and thus reduces the settling efficiency of silica particles.

[0006] To address these issues, we propose an inclined plate settling device for the settling of sodium aluminate desiliconization sludge. Utility Model Content

[0007] The purpose of this invention is to solve the problem in the existing technology that sedimentation tanks rely on natural settling and the position of the sludge hopper to distinguish between activated sludge and dead sludge, resulting in poor separation effect when the sludge is reused. Therefore, this invention proposes an inclined plate settling device for the settling of sodium aluminate desiliconization sludge.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An inclined plate settling device for settling sodium aluminate desiliconization sludge includes:

[0010] The sedimentation tank has an inclined plate settling zone and a turbulence zone inside from top to bottom, and a sludge hopper is provided at the bottom of the sedimentation tank.

[0011] The settling assembly is installed in the inclined plate settling zone to promote the collision and aggregation of sludge flocs;

[0012] A vortex-disrupting component, rotatably disposed within the vortex-disrupting region, includes:

[0013] The hollow spoiler ring has multiple inclined first spoiler plates evenly distributed on its outer periphery and multiple inclined second spoiler plates evenly distributed on its inner wall. The inclination directions of the first spoiler plates and the second spoiler plates are opposite.

[0014] The drive mechanism is used to drive the turbulence ring to rotate at a low speed of 3-10 rpm, forming a circulating flow field in the turbulence zone with the center descending and the outer periphery rising;

[0015] The return pipe has its inlet located in the upper middle part of the turbulence zone and its outlet connected to the front-end reaction tank. A sludge screw pump is installed on the return pipe.

[0016] Preferably, the sedimentation assembly includes two partitions vertically installed inside the sedimentation tank, dividing the inclined plate sedimentation zone into an inlet chamber and sedimentation chambers on both sides, and the sedimentation tank is equipped with an inlet pipe communicating with the inlet chamber;

[0017] The sedimentation chamber is equipped with multiple inclined plates, and the top of the sedimentation tank is equipped with a water outlet trough surrounding the sedimentation tank. The sedimentation chamber and the water outlet trough are positioned at a height lower than the partition and are equipped with a triangular weir. The water outlet trough is connected to a water outlet pipe.

[0018] Preferably, the inclined plate has an inclination angle of 55-60° and a corrugated cross-section, and multiple layers of the inclined plate are stacked to form a honeycomb flow channel.

[0019] Preferably, the sludge hopper is an inverted cone-shaped sludge hopper, the bottom of the sludge hopper is provided with a sludge discharge pipe, and a pneumatic sludge discharge valve is provided on the sludge discharge pipe.

[0020] Preferably, the plurality of first turbulence plates are fixedly connected to two positioning rings coaxial with the turbulence ring. The two positioning rings are respectively located at the upper and lower edges of the first turbulence plates and rotate in cooperation with the inner wall of the sedimentation tank. The inner wall of the turbulence zone is provided with two limiting rings, and the sedimentation component is located between the two limiting rings.

[0021] Preferably, the positioning ring is provided with a plurality of equally spaced rollers on its outer periphery, and the rollers abut against the inner wall of the sedimentation tank.

[0022] Preferably, the driving mechanism includes a drive motor fixedly installed on the outer wall of the sedimentation tank, the output end of the drive motor extending into the turbulence zone and being rotatably connected to the side wall of the sedimentation tank in a sealed manner, a bevel gear fixedly installed on the output end of the drive motor, and a bevel gear ring meshing with the bevel gear is installed on the lower edge of the positioning ring located below.

[0023] The technical effects and advantages of this utility model are as follows: This inclined plate sedimentation device forms a circulating flow field with the center descending and the outer periphery rising through the rotation of the turbulence component. It utilizes the differences in density, particle size and floc structure between activated sludge and dead sludge to achieve precise separation. Through precise separation, the proportion of active ingredients in the reused sludge is high, maintaining the stability of sludge activity and concentration in the front-end flocculation tank, optimizing the silicon removal reaction conditions, and realizing full utilization of resources.

[0024] By utilizing the high settling performance of hardened sludge, its porous structure and high specific surface area promote the adsorption and aggregation of silica gel, forming dense flocs, which greatly improves the fine settling efficiency of silica gel particles, significantly reduces the frequency of fouling of downstream membrane modules, extends the cleaning cycle, reduces the consumption of chemical agents and equipment maintenance costs, and achieves long-term stable operation and economic improvement of wastewater treatment systems. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0027] Figure 3 This is a schematic cross-sectional view of the present invention. Figure 1 ;

[0028] Figure 4 This is a schematic cross-sectional view of the present invention. Figure 2 ;

[0029] Figure 5 This is a schematic diagram of the turbulence component structure in this utility model;

[0030] Figure 6 This is a schematic diagram of the flow direction of the circulating flow field in this utility model;

[0031] Figure 7 for Figure 6 A magnified structural diagram of part A in the middle.

[0032] In the diagram: 1. Sedimentation tank; 11. Sludge hopper; 111. Sludge discharge pipe; 12. Inclined plate settling zone; 121. Liquid inlet chamber; 122. Sedimentation chamber; 123. Liquid inlet pipe; 13. Turbulence zone; 131. Limiting ring; 2. Turbulence assembly; 21. Hollow turbulence ring; 211. First turbulence plate; 212. Second turbulence plate; 22. Drive mechanism; 221. Drive motor; 222. Bevel gear; 223. Bevel gear ring; 23. Positioning ring; 24. Roller; 3. Return pipe; 31. Sludge screw pump; 4. Settling assembly; 41. Baffle plate; 42. Inclined plate; 43. Outlet trough; 44. Triangular weir; 45. Outlet pipe. Detailed Implementation

[0033] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0034] The sludge produced by hardening processes (such as lime softening) has high settling performance (mainly composed of CaCO3 and Mg(OH)2). The surface characteristics of its crystal structure can theoretically serve as crystal nuclei for sodium aluminate desiliconization processes. It can be returned to the desiliconization reaction tank, and through charge neutralization and crystal nucleus induction, the extracellular polymer structure of silica sludge is destroyed, accelerating floc formation and promoting the flocculation and settling of silica sludge.

[0035] Reference Figure 1-7 An inclined plate settling device for the settling of sodium aluminate desiliconization sludge includes a settling tank 1, a turbulence component 2, a return pipe 3, and a settling component 4.

[0036] Traditional sedimentation tanks rely on natural settling, which cannot effectively distinguish between activated sludge and dead sludge, resulting in low selectivity of activated sludge during hardened sludge return. This device achieves deep separation of hardened sludge through the turbulence component 2, resulting in a high proportion of active components in the reused sludge, maintaining stable sludge activity and concentration in the upstream silica removal flocculant tank, optimizing silica removal reaction conditions, and achieving full utilization of resources.

[0037] The sedimentation tank 1 has an inclined plate settling zone 12 and a turbulence zone 13 inside from top to bottom. A sludge hopper 11 is provided at the bottom of the sedimentation tank 1. The inclined plate settling zone 12 has a rectangular box structure and the turbulence zone 13 has a cylindrical structure, which facilitates the installation of the settling component 4 and the turbulence component 2. The inclined plate settling zone 12 smoothly transitions to the turbulence zone 13 through a conical sleeve, reducing dead corners inside the sedimentation tank 1.

[0038] The settling component 4 is installed in the inclined plate settling zone 12 to promote the collision and aggregation of sludge flocs. In the inclined plate settling zone 12, the sludge can be rapidly aggregated by the settling component 4, thereby improving the sludge settling efficiency.

[0039] Reference Figure 1-4 The settling assembly 4 includes two partitions 41 vertically installed inside the settling tank 1, which divide the inclined plate settling area 12 into an inlet chamber 121 and settling chambers 122 on both sides. The settling tank 1 is equipped with an inlet pipe 123 that communicates with the inlet chamber 121. Except for hard wastewater, which is input from the inlet pipe 123, enters the settling tank 1 through the inlet chamber 121 and reaches the turbulence zone 13, and then begins to overflow upward into the inclined plate settling area 12, cooperating with the settling assembly 4 to settle sludge. Due to the obstruction of the partitions 41, the water flow can only enter the settling chamber 122 from the bottom of the partitions 41, forming a uniform upward flow, avoiding the water flow from directly impacting the inclined plate 42, reducing the disturbance of the water flow to the settled flocs, and ensuring the settling effect.

[0040] Reference Figure 1-4The sedimentation chamber 122 is equipped with multiple inclined plates 42. The inclination angle of the inclined plates 42 is 55-60°. This inclination angle is the optimal angle determined through a large number of experiments. It can ensure that the water flow has enough residence time on the inclined plates 42, so that the sludge flocs can fully collide and aggregate. It can also avoid the flocs from sliding down too quickly due to the inclination angle, which would affect the sedimentation efficiency. In addition, the cross section of the inclined plates 42 is corrugated, and the multiple inclined plates 42 are stacked to form a honeycomb flow channel.

[0041] The sedimentation tank 1 is equipped with a water outlet trough 43 around the top of the sedimentation tank 1. The sedimentation chamber 122 is located at a height lower than the partition 41 and is equipped with a triangular weir 44. The water outlet trough 43 is connected to the water outlet pipe 45. When the water rises to the top of the sedimentation chamber 122, the clear water overflows through the triangular weir 44 to the water outlet trough 43 and is then discharged through the water outlet pipe 45. The design of the triangular weir 44 ensures uniform water output. The water flow area of ​​each triangular weir 44 is the same, which avoids local water flow disturbance and ensures stable water quality.

[0042] Reference Figure 1-7 The turbulence component 2 is rotatably disposed within the turbulence zone 13, and includes a hollow turbulence ring 21 and a drive mechanism 22.

[0043] The hollow turbulence ring 21 has multiple inclined first turbulence plates 211 evenly distributed on its outer periphery and multiple inclined second turbulence plates 212 evenly distributed on its inner wall. The inclination directions of the first turbulence plates 211 and the second turbulence plates 212 are opposite. When the turbulence ring 21 rotates, the first turbulence plates 211 push the peripheral fluid upward and the second turbulence plates 212 push the central fluid downward, forming a circulating flow field with the center descending and the periphery rising. Through the inclination angle and layout of the first turbulence plates 211 and the second turbulence plates 212, the fluid forms a stable circulating flow in the turbulence zone 13.

[0044] Reference Figure 1-7 The circulating flow field utilizes the differences in density, particle size, and floc structure between activated sludge and dead sludge, which can serve as crystal nuclei, to achieve precise separation. Due to its low density and loose flocs, activated sludge easily circulates with the upward flow to the upper part of the turbulence zone 13 in the circulating flow field. Due to its high density and dense flocs, dead sludge is difficult to be lifted by the upward flow. When it moves with the downward flow to the top of the sludge hopper 11, it separates from the circulating flow and settles into the sludge hopper 11. Compared with existing technologies that rely on natural settling and the position of the sludge hopper to distinguish between activated sludge and dead sludge, this device achieves efficient separation of activated sludge and dead sludge through flow field control, avoiding the problem of low separation efficiency of traditional natural settling, improving the quality of sludge reuse, and reducing reagent consumption.

[0045] Multiple first turbulence plates 211 are fixedly connected to two positioning rings 23 coaxial with the turbulence ring 21. The two positioning rings 23 are located at the upper and lower edges of the first turbulence plates 211 respectively and rotate in cooperation with the inner wall of the sedimentation tank 1. Two limiting rings 131 are provided on the inner wall of the turbulence zone 13. The sedimentation component 4 is located between the two limiting rings 131. The limiting rings 131 are in contact with the surface of the positioning rings 23, thereby axially limiting the position of the sedimentation component 4 and ensuring the positional stability of the sedimentation component 4.

[0046] Reference Figure 7 The positioning ring 23 has multiple equally spaced rollers 24 on its outer periphery. The rollers 24 abut against the inner wall of the sedimentation tank 1, which reduces rotational resistance.

[0047] Reference Figure 1-7 The drive mechanism 22 drives the turbulence ring 21 to rotate at a low speed of 3-10 rpm, avoiding fluid turbulence and ensuring the stability of the flow field. The drive mechanism 22 includes a drive motor 221 fixedly installed on the outer wall of the sedimentation tank 1. The output end of the drive motor 221 extends into the turbulence zone 13 and is rotatably connected to the side wall of the sedimentation tank 1. A bevel gear 222 is fixedly installed on the output end of the drive motor 221. A bevel gear ring 223 that meshes with the bevel gear 222 is installed on the lower edge of the positioning ring 23 located below. The drive motor 221 drives the turbulence ring 21 to rotate at a low speed of 3-10 rpm through the meshing of the bevel gear 222 and the bevel gear ring 223. The motor 221 rotates at a low speed of 10 rpm. The speed of the drive motor 221 was determined through a limited number of experiments and is adjusted by a frequency converter. Increasing the speed can promote the circulation flow rate and increase the concentration of activated sludge in the turbulence zone 13. Decreasing the speed can reduce the circulation flow rate, thereby promoting sludge settling. It is suitable for use in the treatment of high-concentration wastewater. The specific speed should be adjusted according to the actual treatment volume and water quality to achieve the best turbulence effect.

[0048] The inlet of the return pipe 3 is located in the upper middle part of the turbulence zone 13, and the outlet is connected to the front-end reaction tank, which is the front-end silica removal flocculant tank. The activated sludge in the returned sewage serves as the crystal nucleus carrier. Its porous structure and high specific surface area promote the adsorption and aggregation of silica gel, forming dense flocs. The return pipe 3 is equipped with a sludge screw pump 31, which serves as the power output for sewage return and ensures the stable transport of activated sludge.

[0049] Reference Figure 1-7 The sludge hopper 11 is an inverted cone-shaped sludge hopper 11. The inverted cone design of the sludge hopper 11 facilitates the centralized collection and discharge of dead sludge, and reduces the residue of sludge at the bottom of the tank. The bottom of the sludge hopper 11 is equipped with a sludge discharge pipe 111, and a pneumatic sludge discharge valve is installed on the sludge discharge pipe 111. The sludge discharge time and sludge discharge volume can be set according to actual needs.

[0050] Working principle:

[0051] The wastewater from the hardening process enters the inlet chamber 121 through the inlet pipe 123 and overflows evenly from the bottom of the baffle 41 to the turbulence zone 13. During the rising process, the wastewater entering the turbulence zone 13 interacts with the settling component 4, and the sludge flocs continuously collide and aggregate at the protrusions and depressions between the inclined plates 42.

[0052] As the flocs continue to aggregate and settle, the clear water gradually separates from the sludge. When the water rises to the top of the sedimentation chamber 122, the clear water overflows through the triangular weir 44 to the outlet trough 43 and is then discharged through the outlet pipe 45. The sludge forms flocs and settles into the turbulence zone 13 (which includes activated sludge and dead sludge).

[0053] The turbulence assembly 2 rotates at low speed under the drive of the drive mechanism 22. When the turbulence ring 21 rotates, the first turbulence plate 211 pushes the peripheral fluid upward and the second turbulence plate 212 pushes the central fluid downward, forming a stable circulating flow field with the center descending and the periphery rising.

[0054] The circulating flow field utilizes the differences in density, particle size, and floc structure between activated sludge and dead sludge, which can serve as crystal nuclei, to achieve separation. Activated sludge is easily circulated to the upper part of the turbulence zone 13 with the upward flow in the circulating flow field. Dead sludge, due to its high density and dense flocs, is difficult to be lifted by the upward flow. When it moves to the top of the sludge hopper 11 with the downward flow, it separates from the circulating flow and settles into the sludge hopper 11.

[0055] The inlet of the return pipe 3 is located in the upper middle part of the turbulence zone 13, which is rich in activated sludge. The sludge screw pump 31 serves as the power output to transport the activated sludge in the upper middle part of the turbulence zone 13 to the front-end silica removal flocculation tank. The activated sludge acts as a crystal nucleus carrier, and through charge neutralization and crystal nucleus induction, it destroys the extracellular polymer structure of silica sludge, accelerates floc formation, and promotes the flocculation and sedimentation of silica sludge.

[0056] After the dead sludge settles into the sludge hopper 11, it is discharged from the system through the sludge discharge pipe 111. The pneumatic sludge discharge valve can set the sludge discharge time and sludge discharge volume according to actual needs, realizing the automated control of sludge discharge.

Claims

1. A tilting plate settling device for settling metasilicic acid- containing sludge of a metallurgical process, characterized in that include: The sedimentation tank (1) has an inclined plate settling zone (12) and a turbulence zone (13) inside from top to bottom. A sludge hopper (11) is provided at the bottom of the sedimentation tank (1). Settling component (4) is installed in the inclined plate settling zone (12) to promote the collision and aggregation of sludge flocs; A turbulence-disrupting component (2), rotatably disposed within the turbulence-disrupting region (13), includes: The hollow spoiler ring (21) has multiple inclined first spoiler plates (211) evenly distributed on its outer periphery and multiple inclined second spoiler plates (212) evenly distributed on its inner wall. The inclination directions of the first spoiler plates (211) and the second spoiler plates (212) are opposite. The drive mechanism (22) is used to drive the turbulence ring (21) to rotate at a low speed of 3-10 rpm, forming a circulating flow field with the center descending and the outer periphery rising in the turbulence zone (13); The return pipe (3) has its inlet located in the upper middle part of the turbulence zone (13) and its outlet connected to the front reaction tank. The return pipe (3) is equipped with a sludge screw pump (31).

2. The inclined plate settling device for settling sodium aluminate desiliconization sludge according to claim 1, characterized in that, The settling assembly (4) includes two partitions (41) vertically installed inside the settling tank (1), which divide the inclined plate settling area (12) into an inlet chamber (121) and settling chambers (122) on both sides. The settling tank (1) is equipped with an inlet pipe (123) that communicates with the inlet chamber (121). The sedimentation chamber (122) is provided with multiple inclined plates (42), and the top of the sedimentation tank (1) is provided with a water outlet trough (43) surrounding the sedimentation tank (1). The height of the sedimentation chamber (122) and the water outlet trough (43) is lower than that of the partition plate (41) and a triangular weir (44) is provided. The water outlet trough (43) is connected to the water outlet pipe (45).

3. The inclined plate settling device for settling sodium aluminate desiliconization sludge according to claim 1, characterized in that, The inclined plate (42) has an inclination angle of 55-60° and the cross section of the inclined plate (42) is corrugated. Multiple layers of the inclined plate (42) are stacked to form a honeycomb flow channel.

4. The inclined plate settling device for settling sodium aluminate desiliconization sludge according to claim 1, characterized in that, The sludge hopper (11) is an inverted cone-shaped sludge hopper (11), and a sludge discharge pipe (111) is provided at the bottom of the sludge hopper (11), and a pneumatic sludge discharge valve is provided on the sludge discharge pipe (111).

5. The inclined plate settling device for settling sodium aluminate desiliconization sludge according to claim 1, characterized in that, Multiple first baffles (211) are fixedly connected to two positioning rings (23) coaxial with the baffle ring (21). The two positioning rings (23) are located at the upper and lower edges of the first baffles (211) and rotate in cooperation with the inner wall of the sedimentation tank (1). The inner wall of the baffle zone (13) is provided with two limiting rings (131), and the sedimentation component (4) is located between the two limiting rings (131).

6. The inclined plate settling device for settling sodium aluminate desiliconization sludge according to claim 5, characterized in that, The positioning ring (23) is provided with a plurality of equally spaced rollers (24) on its outer periphery, and the rollers (24) abut against the inner wall of the sedimentation tank (1).

7. The inclined plate settling device for settling sodium aluminate desiliconization sludge according to claim 5, characterized in that, The drive mechanism (22) includes a drive motor (221) fixedly installed on the outer wall of the sedimentation tank (1). The output end of the drive motor (221) extends into the turbulence zone (13) and is rotatably connected to the side wall of the sedimentation tank (1). A bevel gear (222) is fixedly installed on the output end of the drive motor (221). A bevel gear ring (223) that meshes with the bevel gear (222) is installed on the lower edge of the positioning ring (23) located below.

Images