Integrated chemical precipitation flocculation reactor for sludge enrichment

Abstract

The utility model provides a kind of for sludge enrichment integrated chemical precipitation flocculation reactor, it is related to wastewater treatment field, including inner cylinder and bottom section V-shaped outer cylinder, cyclonic shear type outer circulation water distributor is provided in outer cylinder inside, three-phase separator and inclined pipe, outer circulation water distributor is set in the top of bottom sludge hopper, buffer zone is provided between inclined pipe and three-phase separator, annular circulation water suction pipe that can suck sludge-water mixture is provided on the outer cylinder wall of buffer zone, sludge-water mixture in annular circulation water suction pipe is returned to outer circulation water distributor by circulating pump and pipeline reflux, can enrich chemical precipitation sludge under not adding PAC and other coagulant, improve the concentration and purity of chemical precipitation sludge, form granular spherical sludge, improve the dewatering performance of sludge, improve the utilization value of sludge.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to an integrated chemical precipitation and flocculation reactor for sludge enrichment. Background Technology

[0002] In the electronics, semiconductor, and photovoltaic industries, chemical precipitation is commonly used in wastewater treatment systems to remove inorganic pollutants from wastewater, such as the treatment of fluoride-containing wastewater, phosphorus-containing wastewater, and the pretreatment of calcium-containing wastewater. After chemical precipitation, coagulants such as PAC are often added to further form large flocs, which facilitate the subsequent flocculation of flocculants into easily settled sludge, enabling more efficient sludge-water separation in the sedimentation tank. However, the addition of PAC coagulants to traditional chemical coagulation sedimentation systems not only increases the amount of sludge to be treated and the operating costs, but also reduces the purity of the sludge, resulting in high water content, which is not conducive to the recycling, purification, and reuse of this sludge. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides an integrated chemical precipitation flocculation reactor for sludge enrichment. It can enrich chemically precipitated sludge without adding coagulants such as PAC, increasing the concentration and purity of the sludge, forming granular spherical sludge, improving the sludge's dewatering performance, enhancing its utilization value, and solving the problems mentioned in the background technology.

[0004] Technical solution

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: an integrated chemical precipitation flocculation reactor for sludge enrichment, comprising an inner cylinder and an outer cylinder with a V-shaped bottom cross section. The inner side of the outer cylinder is provided with a swirl shear-type external circulation water distributor, a three-phase separator, and an inclined tube. The external circulation water distributor is located at the top of the bottom sludge hopper. A buffer zone is provided between the inclined tube and the three-phase separator. An annular circulation suction pipe capable of sucking up the sludge-water mixture is provided on the outer cylinder wall of the buffer zone. The sludge-water mixture in the annular circulation suction pipe is returned to the external circulation water distributor through a circulation pump and pipeline.

[0006] Furthermore, an agitator is installed above the middle water inlet zone of the inner cylinder, and the agitator blades are evenly distributed inside the middle reaction zone.

[0007] Furthermore, several guide plates are evenly installed on the inner wall of the intermediate water inlet zone, and a PAM dosing pipe runs through the inner side of the outer cylinder, with the outlet of the PAM dosing pipe extending to the inner side of the intermediate water inlet zone.

[0008] Furthermore, the external circulation water distributor is ring-shaped, and multiple vortex water distributors are installed at equal intervals on both the outer and inner rings of the external circulation water distributor. The water outlet direction of the vortex water distributors on the outer ring of the external circulation water distributor is opposite to that of the vortex water distributors on the inner ring.

[0009] Furthermore, several bottom water outlet holes are provided on the surface where the outer cylinder and the inner cylinder meet, and the bottom water outlet holes and the external circulation water distributor are on the same horizontal line.

[0010] Furthermore, the bottom sludge hopper has several bottom sludge discharge ports connected at equal intervals around its bottom.

[0011] Furthermore, several water and mud suction balance holes are equidistantly provided at the interface between the inner and outer cylinders at the bottom of the buffer zone.

[0012] The beneficial effects of this utility model are as follows:

[0013] It can enrich chemically precipitated sludge without adding coagulants such as PAC, improve the concentration and purity of chemically precipitated sludge, form granular spherical sludge, improve the dewatering performance of sludge, and increase the utilization value of sludge. Moreover, the reactor is an integrated unit, and the integrated design has a small footprint, which greatly reduces construction costs. The saving of coagulants not only reduces sludge production but also reduces operating costs. Attached Figure Description

[0014] Figure 1 This is a front view of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0016] Figure 3 This is a top view of the structure of this utility model;

[0017] Figure 4 This is a diagram showing the position distribution of the vortex water distributor of this utility model on the external circulation water distributor;

[0018] Figure 5 This is a schematic diagram showing the location of the mud discharge port at the bottom of the structure of this utility model.

[0019] The components are as follows: 1. Inner cylinder; 2. Outer cylinder; 3. External circulation water distributor; 4. Three-phase separator; 5. Inclined pipe; 6. Bottom sludge hopper; 7. Buffer zone; 8. Annular circulation suction pipe; 9. Intermediate water inlet zone; 10. Mixer; 11. Intermediate reaction zone; 12. Baffle plate; 13. PAM dosing pipe; 14. Swirl water distributor; 15. Bottom water outlet; 16. Bottom sludge discharge port; 17. Water and sludge balance hole; 18. Water outlet weir. Detailed Implementation

[0020] 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.

[0021] See Figures 1-5 An integrated chemical precipitation flocculation reactor for sludge enrichment includes an inner cylinder 1 and an outer cylinder 2 with a V-shaped bottom cross-section. The inner side of the outer cylinder 2 is provided with a swirl shear-type external circulation water distributor 3, a three-phase separator 4, and an inclined tube 5. The external circulation water distributor 3 is located at the top of the bottom sludge hopper 6. A buffer zone 7 is provided between the inclined tube 5 and the three-phase separator 4. The outer cylinder 2 wall of the buffer zone 7 is provided with an annular circulation suction pipe 8 that can draw in the sludge-water mixture. The sludge-water mixture in the annular circulation suction pipe 8 is returned to the external circulation water distributor 3 through a circulation pump and pipeline.

[0022] In this plan: (e.g.) Figure 2 As shown, the V-shaped outer cylinder 2 at the bottom allows the settled sludge to concentrate. After the sludge at the bottom is discharged, the sludge at the top can move downwards under the action of gravity, facilitating its concentrated discharge. When the mixed mud-water mixture enters the outer cylinder 2, the external circulation water distributor 3 sprays out the wastewater settled in the inclined pipe 5 and mixes it again with the newly entered mud-water mixture. Under the action of the swirling shear-type external circulation water distributor 3, the resulting swirling flow can drive the mud-water mixture upwards at high speed, ensuring uniform water distribution and promoting sludge particle formation. After rising in the outer cylinder 2, the mud-water mixture first enters the three-phase separator 4. The three-phase separator 4 can buffer the impact of mechanical stirring and form particles. Large sludge particles are separated here and fall into the bottom sludge hopper 6 under gravity. Small sludge particles continue to rise, with some entering the annular circulating suction pipe 8 for recirculation and the other entering the inclined pipe 5 for further sludge-water separation. At this time, the small sludge particles sink, and some are sucked into the annular circulating suction pipe 8 and poured into the circulation. In this way, impurities in the sludge-water mixture can be repeatedly mixed in the outer cylinder 2 and form sludge particles. This allows for the enrichment of chemically precipitated sludge without the addition of coagulants such as PAC, increasing the concentration and purity of the chemically precipitated sludge, forming granular spherical sludge, improving the dewatering performance of the sludge, and increasing the utilization value of the sludge.

[0023] A mixer 10 is installed above the middle water inlet zone 9 of the inner cylinder 1, and the mixing blades of the mixer 10 are evenly distributed inside the middle reaction zone 11.

[0024] In this embodiment, the mixer 10 can mix and stir the sewage and PAM flocculant entering the inner cylinder 1, thereby accelerating the mixing speed of the sewage and the agent. Furthermore, during the thorough stirring of the mixer 10, the flocculated impurities will not remain at the bottom of the inner cylinder 1, but will instead enter the outer cylinder 2 evenly to settle, making it easier to collect and clean the impurities.

[0025] Several guide plates 12 are evenly installed on the inner wall of the intermediate water inlet zone 9. A PAM dosing pipe 13 runs through the inner side of the outer cylinder 2, and the outlet of the PAM dosing pipe 13 extends to the inner side of the intermediate water inlet zone 9.

[0026] In this embodiment: In the reactor, the guide plate 12 can guide the wastewater and the agent mixture to flow evenly along the reaction zone, avoiding the flocs from being broken up due to excessively fast local flow velocity, or the sedimentation and accumulation due to excessively slow flow velocity. During the mixing process of wastewater and PAM agent, the guide plate 12 can generate turbulence by changing the flow channel cross-section, thereby enhancing the contact efficiency between wastewater and PAM agent and increasing the reaction rate.

[0027] The external circulation water distributor 3 is ring-shaped, and multiple vortex water distributors 14 are installed at equal intervals on both the outer and inner rings of the external circulation water distributor 3. The water outlet direction of the vortex water distributors 14 on the outer ring of the external circulation water distributor 3 is opposite to that of the vortex water distributors 14 on the inner ring.

[0028] In this embodiment, the vortex distributors 14 are respectively installed on the outer and inner rings of the external circulation distributor 3 and the water outlet directions are opposite. When the vortex distributors 14 discharge water, the movement trajectory of the sewage will change under the action of the inner wall of the outer cylinder 2, changing from linear motion to centrifugal motion, forming a centrifugal force field. Under the action of gravity, the denser part of the sewage will move downward in a spiral flow to form an outer vortex, while the less dense sewage will form an inner vortex and move upward at high speed, increasing hydraulic shear, forming large sludge particles, and accelerating the combination of sludge particles.

[0029] Several bottom water outlet holes 15 are provided on the surface where the outer cylinder 2 and the inner cylinder 1 meet. The bottom water outlet holes 15 and the external circulation water distributor 3 are on the same horizontal line.

[0030] In this embodiment: the bottom water outlet 15 can guide the mud and water in the inner cylinder 1 to the outer cylinder 2. When the mud and water in the inner cylinder 1 enters the outer cylinder 2, because the bottom water outlet 15 and the external circulation water distributor 3 are at the same height, the mud and water can directly mix with the water sprayed by the vortex water distributor 14. During the process of water flow rotating and rising, the mud and water particles are quickly mixed, so that the mud and water particles rotate and crystallize into larger sludge particles and then settle.

[0031] The bottom sludge hopper 6 has several bottom sludge discharge ports 16 connected at equal intervals around its bottom.

[0032] In this embodiment, multiple bottom sludge discharge ports 16 are provided, so sludge can be extracted from the bottom sludge hopper 6 all around at the same time. Although the bottom sludge discharge ports 16 can lower their height under the action of gravity after extraction to compensate for the space of the extracted sludge, a single bottom sludge discharge port 16 cannot fully extract the sludge. Multiple bottom sludge discharge ports 16 can extract the sludge evenly, improving the sludge extraction effect.

[0033] Several water and mud suction balance holes 17 are equidistantly provided on the interface between the inner cylinder 1 and the outer cylinder 2 at the bottom of the buffer zone 7.

[0034] In this embodiment: when the small sludge mixture flows upward into the buffer zone 7, most of the sludge mixture will enter the inclined pipe 5 and the annular circulating water suction pipe 8, and a small part of the sludge mixture will enter the water suction and sludge balance hole 17 and be sucked by the inner cylinder 1. The mud-water mixture entering the inner cylinder 1 can be used to balance the impact brought by mechanical stirring. It should be noted that the water suction and sludge balance hole 17 needs to be equipped with a backflow prevention device to prevent the water in the inner cylinder 1 from flowing out, and to prevent the sewage in the inner cylinder 1 from directly entering the outer cylinder 2.

[0035] During operation, wastewater is pumped to a pH adjustment tank by a lift pump. After adjusting the pH value to a suitable level for the reaction, the wastewater flows by gravity into the intermediate inlet zone 9 of the reactor. The dosing system in the intermediate inlet zone 9 adds a precipitant to the wastewater. The wastewater and precipitant then enter the intermediate reaction zone 11, where they are mixed evenly by the agitator 10 to form a chemical precipitate. The sludge-water mixture moves downwards in the inner cylinder 1 of the reactor under the action of the agitator 10. Upon reaching the bottom, it mixes with the PAM dosing pipe 13, and the PAM agent is added to the system. Afterward, the wastewater enters the outer cylinder 2 through the bottom outlet hole 15 on the bottom side wall of the inner cylinder 1. The outer cylinder 2 undergoes a flocculation reaction to form granular sludge. Large granular sludge particles are deposited in the sludge hopper, while small granular sludge-water mixtures move upwards at high speed under the action of the external circulation distributor 3. After rising in the outer cylinder 2, the sludge-water mixture first reaches the three-phase separator 4, which is used to buffer the impact of mechanical agitation and form granular sludge. Granular sludge is separated here and falls into the bottom sludge hopper 6. The mud-water mixture formed by the small granular sludge continues to rise and reaches the annular circulating suction pipe 8. Part of it is sucked by the annular circulating suction pipe 8, part of it continues to rise, and a small part is sucked by the inner cylinder 1 through the suction and sludge balance hole 17 on the side wall of the inner cylinder 1 to balance the impact of mechanical stirring. The mud-water mixture that continues to rise passes through the top inclined pipe 5 and is separated into mud and water again. At this time, the small granular sludge sinks, part of it is sucked by the annular circulating suction pipe 8, and part of it is sucked by the suction and sludge balance hole 17. The top of the inclined pipe 5 is the supernatant, which continues to rise to the outlet weir 18 and overflows. The sewage in the annular circulating suction pipe 8 flows back to the bottom external circulating water distributor 3 through the pipeline. The sludge is enriched in the reactor, and the sludge residence time and hydraulic residence time are separated. When the sludge concentration in the bottom sludge hopper 6 reaches a certain amount, the sludge is discharged through the bottom sludge discharge port 16.

[0036] It should be noted that in this paper, relational terms such as first and second are used only 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.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An integrated chemical precipitation flocculation reactor for sludge enrichment, comprising an inner cylinder (1) and an outer cylinder (2) with a V-shaped bottom cross-section, characterized in that: The outer cylinder (2) is equipped with a vortex shear type external circulation water distributor (3), a three-phase separator (4) and an inclined tube (5). The external circulation water distributor (3) is located at the top of the bottom sludge hopper (6). A buffer zone (7) is provided between the inclined tube (5) and the three-phase separator (4). The outer cylinder (2) wall of the buffer zone (7) is equipped with an annular circulation suction pipe (8) that can suck up the mud-water mixture. The mud-water mixture in the annular circulation suction pipe (8) is returned to the external circulation water distributor (3) through the circulation pump and pipeline.

2. The integrated chemical precipitation flocculation reactor for sludge enrichment according to claim 1, characterized in that: A mixer (10) is installed above the middle water inlet zone (9) of the inner cylinder (1), and the mixing blades of the mixer (10) are evenly distributed inside the middle reaction zone (11).

3. The integrated chemical precipitation flocculation reactor for sludge enrichment according to claim 1, characterized in that: Several guide plates (12) are evenly installed on the inner wall of the intermediate water inlet zone (9). A PAM dosing pipe (13) runs through the inner side of the outer cylinder (2). The outlet of the PAM dosing pipe (13) extends to the inner side of the intermediate water inlet zone (9).

4. The integrated chemical precipitation flocculation reactor for sludge enrichment according to claim 1, characterized in that: The external circulation water distributor (3) is ring-shaped, and multiple vortex water distributors (14) are installed at equal intervals on both the outer and inner rings of the external circulation water distributor (3). The water outlet direction of the vortex water distributors (14) on the outer ring of the external circulation water distributor (3) is opposite to that of the vortex water distributors (14) on the inner ring.

5. The integrated chemical precipitation flocculation reactor for sludge enrichment according to claim 1, characterized in that: Several bottom water outlet holes (15) are provided on the surface where the outer cylinder (2) and the inner cylinder (1) meet. The bottom water outlet holes (15) and the external circulation water distributor (3) are on the same horizontal line.

6. The integrated chemical precipitation flocculation reactor for sludge enrichment according to claim 1, characterized in that: The bottom sludge hopper (6) has several bottom sludge discharge ports (16) connected at equal intervals around its bottom.

7. The integrated chemical precipitation flocculation reactor for sludge enrichment according to claim 1, characterized in that: Several water and mud suction balance holes (17) are provided at equal intervals on the interface between the inner cylinder (1) and the outer cylinder (2) at the bottom of the buffer zone (7).

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