Chlorine-containing wastewater treatment device

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to a chlorine-containing wastewater treatment device which comprises a reaction flocculation device, a solid-liquid settling separation device, a filtering and deslagging device and a material returning device, the reaction flocculation device comprises a flocculation reaction tank, a cylinder positioned in the flocculation reaction tank, a barrel support for supporting the cylinder and the flocculation reaction tank, solid feeding equipment and a gas distribution plate positioned at the bottom of the flocculation reaction tank; and the solid-liquid settling separation device comprises a settling tank. According to the chlorine-containing wastewater treatment device, a reaction path that compressed air is introduced for airlift circulation is adopted, and compared with traditional mechanical stirring and mixing, the chlorine-containing wastewater treatment device has the advantages that mixing is uniform, stirring is free of dead corners, gas circulates inside and outside the cylinder, flocculates and settles, and efficiency is high. According to the principle of a settling tank for sewage treatment, chloride ions subjected to flocculating settling pass through the settling tank part, so that solid and liquid are fully separated. A physical method is adopted for separation, energy is saved, consumption is reduced, the separation efficiency is high, and the obtained clear liquid is low in solid content.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a chlorine-containing wastewater treatment device. Background Art

[0002] Industrial production processes rely heavily on inorganic reagents such as NaCl and KCl, which contribute to high salt levels, particularly high chloride ion concentrations, in industrial wastewater. High chloride ion concentrations not only complicate wastewater treatment but, if discharged untreated into the surrounding water, can directly impact the growth and metabolism of plants and animals, corrode building materials, and severely impact the environment.

[0003] Currently, common industrial wastewater dechlorination methods include distillation, electrolysis, adsorption, and chemical precipitation. However, for high-chloride wastewater, the high Cl content makes distillation and electrolysis relatively expensive, making them uneconomical and impractical. While adsorption is feasible, it easily reaches saturation, reducing Cl removal efficiency and requiring frequent adsorbent replacement, increasing operating costs. Utility Model Content

[0004] The present utility model aims to provide a chlorine-containing wastewater treatment device to address the problem raised in the background art above that currently, commonly used industrial wastewater dechlorination methods include distillation, electrolysis, adsorption, and chemical precipitation. However, for high-chloride wastewater, due to the high chlorine content, the cost of dechlorination using distillation and electrolysis is relatively high, making it uneconomical and impractical.

[0005] To achieve the above-mentioned purpose, the utility model provides a chlorine-containing wastewater treatment device, including a reaction flocculation device, a solid-liquid sedimentation separation device, a filtering and slag discharge device and a material return device;

[0006] The reaction flocculation device includes a flocculation reaction tank, a cylindrical drum located inside the flocculation reaction tank, a barrel support supporting the cylindrical drum and the flocculation reaction tank, a solid feeding device, and an air distribution plate located at the bottom of the flocculation reaction tank;

[0007] The solid-liquid sedimentation separation device includes a sedimentation tank, a plurality of baffles are vertically installed inside the sedimentation tank, a plurality of sedimentation plates are installed outside the baffles, a clear liquid outlet is provided on one side of the upper part of the sedimentation tank, a sampling valve is installed at the clear liquid outlet, and a sight glass is installed on the outer wall of the sedimentation tank;

[0008] The filtering and slag discharge device includes a stirring device, a liquid pipe, a solid pipe, a filter screen, a solid discharge valve and a vacuum box. The bottom end of the solid pipe is provided with a solid outlet, and the bottom end of the liquid pipe is connected to a filtrate pipe;

[0009] The return device includes a return pipe and a return pump, which are used to return substandard wastewater to the reaction flocculation device for further treatment.

[0010] Preferably, the cylinder body thickness is 3-10 mm, the cylinder body is covered with round holes with a diameter of 1-4 mm, and the opening rate is 90-95%. The bottom end of the cylinder is connected to a wastewater pipe, and the output end of the return pump is connected to the wastewater pipe.

[0011] Preferably, a plurality of air distribution holes are provided on the surface of the air distribution plate, one end of the air distribution plate is connected to a compressed air pipe, a ball valve is installed on the compressed air pipe, the air distribution plate is circular, with a thickness of 5 mm, a total of 18 air distribution holes, a hole diameter of 2 mm, and the air distribution holes are distributed in three circles, with 4 holes in the inner circle, 6 holes in the middle circle, and 8 holes in the outer circle.

[0012] Preferably, the solid feeding equipment includes a screw conveyor, one end of which is driven by a feeding motor, a feed port is provided at the top of the screw conveyor, and a discharge end of the screw conveyor is connected to the top of the cylindrical barrel.

[0013] Preferably, the top of the flocculation reaction tank is connected to a tail gas outlet, and an overflow port is provided on one side of the upper portion of the flocculation reaction tank.

[0014] Preferably, the stirring device includes a stirring paddle, the top end of which is driven to rotate by a V-belt, a pulley, and a stirring motor.

[0015] Preferably, the bottom end of the filtrate tube is connected to a return pipe, and one side of the filtrate tube is also connected to a dechlorination wastewater pipe.

[0016] Preferably, the bottom end of the vacuum box is connected to a vacuum tank via a vacuum tube, and one side of the vacuum tank is connected to a vacuum pump.

[0017] Preferably, the barrel support is divided into two layers, which are located between the outer wall of the cylindrical barrel and the inner wall of the flocculation reaction tank. A number of support rods are radially distributed on each layer, and the support rods connect the cylindrical barrel and the flocculation reaction tank.

[0018] Preferably, the baffle is 3 mm thick and there are three of them; the sedimentation plate forms an angle of 30-45° with the baffle, and the length of the sedimentation plate is 1 / 3 of the baffle.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the chlorine-containing wastewater treatment device, a reaction path of airlift circulation is adopted by introducing compressed air. Compared with the traditional mechanical stirring and mixing, it has the advantages of uniform mixing and stirring without dead corners. The gas circulates inside and outside the cylindrical tube for flocculation and sedimentation, and has high efficiency.

[0021] 2. This chlorine-containing wastewater treatment device uses the same sedimentation tank principle as sewage treatment. Chloride ions, after flocculation and sedimentation, pass through the sedimentation tank, achieving complete solid-liquid separation. This physical separation method saves energy and reduces consumption, with high separation efficiency and a low solids content in the resulting clear liquid.

[0022] 3. In the chlorine-containing wastewater treatment device, vacuum filtration plus stirring is used to dehydrate and separate the settled solids. The filtration efficiency is high, the filter cake has low water content, and can be directly transported to the yard by belt.

[0023] 4. This chlorine-containing wastewater treatment device integrates three modules: reaction, sedimentation, and vacuum filtration. The device is compact, occupies a small area, and has high chloride ion treatment efficiency. It has a utility model patent with certain innovation and novelty. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the air distribution plate of the utility model;

[0026] Figure 3 This is a schematic diagram of the cylindrical structure of the utility model;

[0027] The meaning of each number in the figure is:

[0028] 1. Wastewater pipe; 2. Compressed air pipe; 3. Ball valve; 4. Air distribution plate; 5. Air distribution hole; 6. Cylinder; 7. Bucket support; 8. Flocculation reaction tank; 9. Round hole; 10. Feeding motor; 11. Feed inlet; 12. Screw conveyor; 13. Exhaust gas outlet; 14. Overflow port; 15. Baffle; 16. Clear liquid outlet; 17. Sampling valve; 18. Sedimentation plate; 19. Sedimentation tank; 20. V-belt; 21. Pulley; 22. Sight glass; 23. Stirring motor; 24. Vacuum box; 25. Filter screen; 26. Stirring paddle; 27. Liquid pipe; 28. Solid pipe; 29. Solid discharge valve; 30. Filtrate pipe; 31. Solid outlet; 32. Dechlorination wastewater pipe; 33. Return pipe; 34. Return pump; 35. Vacuum pipe; 36. Vacuum tank; 37. Vacuum pump. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] The utility model provides a chlorine-containing wastewater treatment device, such as Figure 1-Figure 3 As shown, it includes a reaction flocculation device, a solid-liquid sedimentation separation device, a filtering and slag discharge device and a material return device;

[0031] The reaction flocculation device includes a flocculation reaction tank 8, a cylindrical drum 6 located inside the flocculation reaction tank 8, a barrel support 7 supporting the cylindrical drum 6 and the flocculation reaction tank 8, a solid feeding device, and an air distribution plate 4 located at the bottom of the flocculation reaction tank 8;

[0032] The solid-liquid sedimentation separation device includes a sedimentation tank 19, a plurality of baffles 15 are vertically installed inside the sedimentation tank 19, a plurality of sedimentation plates 18 are installed outside the baffles 15, a clear liquid outlet 16 is provided on one side of the upper portion of the sedimentation tank 19, a sampling valve 17 is installed at the clear liquid outlet 16, and a sight glass 22 is installed on the outer wall of the sedimentation tank 19;

[0033] The filtration and slag removal device includes a stirring device, a liquid pipe 27, a solid pipe 28, a filter screen 25, a solid discharge valve 29, and a vacuum box 24. The bottom end of the solid pipe 28 is provided with a solid outlet 31, and the bottom end of the liquid pipe 27 is connected to a filtrate pipe 30. Through the design of the reaction flocculation device, the chloride ions and other pollutants in the wastewater can be fully mixed and reacted with the added solid reagents in the flocculation reaction tank 8. The design of the cylindrical barrel 6 and the circular hole 9 thereon contributes to the uniform distribution of the reagents and the effective circulation of the wastewater. At the same time, the air distribution plate 4 and its air distribution holes 5 can provide the necessary compressed air to promote the suspension and flocculation of pollutants in the wastewater, thereby improving the reaction efficiency.

[0034] The solid-liquid sedimentation separation device achieves efficient separation of solid-liquid mixtures through the design of baffles 15 and settling plates 18 within the settling tank 19. The specific angles and layout of baffles 15 and settling plates 18 facilitate the sedimentation of solid particles and the rise of liquid, thereby enhancing the solid-liquid separation effect. The design of the clear liquid outlet 16 and sampling valve 17 facilitates the collection of treated clear liquid, allowing for observation of the sedimentation status within the settling tank 19 through the sight glass 22.

[0035] The filtration and deslagging device, through components such as a stirring device, a filter screen 25, and a vacuum chamber 24, further filters the liquid after solid-liquid separation and discharges the solid residue. The stirring device maintains the fluidity of the liquid, preventing solid particles from accumulating on the filter screen, thereby improving filtration efficiency. The filter screen 25 captures unsettled fine solid particles, ensuring liquid cleanliness. The design of the solid discharge valve 29 and solid outlet 31 facilitates the discharge of filtered solid residue from the device, maintaining continuous operation.

[0036] The return device includes a return pipe 33 and a return pump 34, which are used to return the substandard wastewater to the reaction flocculation device for further treatment.

[0037] In this embodiment, the cylindrical barrel 6 has a thickness of 3-10 mm and is covered with circular holes 9 with a diameter of 1-4 mm, with an opening ratio of 90-95%. This design greatly increases the contact area between the wastewater and the solid reagent, promoting effective flocculation and precipitation of pollutants in the wastewater. The bottom end of the cylindrical barrel 6 is connected to the wastewater pipe 1, and the output end of the return pump 34 is connected to the wastewater pipe 1. This achieves rapid reflux and re-treatment of substandard wastewater, improving the efficiency and compliance rate of wastewater treatment.

[0038] Specifically, a plurality of air distribution holes 5 are provided on the surface of the air distribution plate 4. One end of the air distribution plate 4 is connected to a compressed air pipe 2, so that the compressed air can be evenly distributed into the wastewater, thereby promoting the suspension and mixing of pollutants in the wastewater and improving the reaction efficiency. A ball valve 3 is installed on the compressed air pipe 2. The air distribution plate 4 is circular and has a thickness of 5 mm. The total number of air distribution holes 5 is 18 with a hole diameter of 2 mm. The air distribution holes 5 are distributed in three circles, with 4 holes in the inner circle, 6 holes in the middle circle, and 8 holes in the outer circle.

[0039] Furthermore, the solid feeding equipment includes a screw conveyor 12, one end of which is driven by a feeding motor 10, a feed port 11 is provided at the top of the screw conveyor 12, and a discharge end of the screw conveyor 12 is connected to the top of the cylindrical barrel 6. The design of the screw conveyor 12 realizes the continuous and stable feeding of solid reagents, avoiding the inconvenience and low efficiency of manual feeding. The drive of the feeding motor 10 ensures the reliable operation and precise control of the screw conveyor 12. The setting of the feed port 11 facilitates the addition and replacement of solid reagents. The discharge end of the screw conveyor 12 is connected to the top of the cylindrical barrel 6, ensuring the direct and effective addition of reagents and improving the reaction efficiency.

[0040] Furthermore, the top of the flocculation reaction tank 8 is connected to an exhaust gas outlet 13 to facilitate the discharge of gases generated during the treatment process, maintaining pressure balance and air circulation in the reaction tank. An overflow port 14 is provided on one side of the upper portion of the flocculation reaction tank 8 to prevent overflow and waste of wastewater during the treatment process and facilitate cleaning and maintenance of the reaction tank.

[0041] Furthermore, the stirring device includes a stirring paddle 26, the top of which is driven to rotate by a V-belt 20, a pulley 21, and a stirring motor 23. This achieves sufficient stirring and mixing of the wastewater, promoting uniform distribution and reaction of pollutants in the wastewater.

[0042] Furthermore, the bottom end of the filtrate tube 30 is connected to the return pipe 33, which realizes the reflux and re-treatment of the filtrate, improves the efficiency and compliance rate of wastewater treatment, and one side of the filtrate tube 30 is also connected to the dechlorination wastewater pipe 32, which is convenient for discharging the treated wastewater out of the device for subsequent treatment or discharge.

[0043] Furthermore, the bottom end of the vacuum box 24 is connected to a vacuum tank 36 via a vacuum tube 35, and one side of the vacuum tank 36 is connected to a vacuum pump 37. This achieves vacuum control of the filtration process, thereby improving filtration efficiency and solid removal rate.

[0044] Furthermore, the barrel support 7 is divided into two layers, located between the outer wall of the cylinder 6 and the inner wall of the flocculation reaction tank 8. Each layer has four support rods, which connect the cylinder 6 and the flocculation reaction tank 8 at 90 degrees to each other. This ensures stable support and precise positioning of the cylinder 6 in the reaction tank 8.

[0045] Furthermore, the baffles 15 are 3 mm thick and there are three of them; the settling plates 18 are at an angle of 30-45° to the baffles 15, and the length of the settling plates 18 is 1 / 3 of the length of the baffles 15. This design optimizes the solid-liquid separation effect, improves the settling efficiency and the purity of the clear liquid.

[0046] When the chlorine-containing wastewater treatment device of the present invention is in use, the chlorine-containing wastewater is first introduced into the flocculation reaction tank 8 through pipe 1. Simultaneously, compressed air pipe 2 begins operating, evenly distributing compressed air into the wastewater through air distribution holes 5 on air distribution plate 4. These tiny bubbles carry the wastewater upward, enhancing its mixing and suspension.

[0047] Chloride ion flocculant is quantitatively added to the flocculation reaction tank 8 via screw conveyor 12. Screw conveyor 12 is driven by a feed motor 10, ensuring continuous and stable addition of the reagent. The design of the cylindrical barrel 6 and the circular holes 9 therein facilitates the uniform distribution of the reagent into the wastewater, allowing it to fully mix and react with the chloride ions and other pollutants in the wastewater. Gases generated during the reaction are discharged through tail gas outlet 13 into an absorption tower for treatment, maintaining pressure balance and air circulation within the reaction tank.

[0048] After the reaction is complete, wastewater flows through overflow port 14 into sedimentation tank 19. Within sedimentation tank 19, the design of baffles 15 and settling plates 18 achieves efficient separation of the solid-liquid mixture. The specific angles and layout of baffles 15 and settling plates 18 facilitate the sedimentation of solid particles and the rise of liquid. The treated clear liquid flows through clear liquid outlet 16 into a storage tank and can be sampled and analyzed through sampling valve 17.

[0049] The remaining water-containing solid sediment in the sedimentation tank 19 is stirred by a stirring device to maintain the fluidity of the liquid and prevent solid particles from accumulating on the filter screen. The stirred mixture enters the filter and residue discharge device and is filtered through the filter screen 25. The filter screen 25 can intercept the fine solid particles that have not settled, ensuring the cleanliness of the liquid. The solid residue after filtration is discharged from the device through the solid discharge valve 29 and the solid outlet 31, while the filtrate flows out through the liquid pipe 27 and the filtrate pipe 30. The bottom end of the filtrate pipe 30 is connected to the return pipe 33, which realizes the backflow and reprocessing of the filtrate, thereby improving the efficiency and compliance rate of wastewater treatment. At the same time, one side of the filtrate pipe 30 is also connected to the dechlorination wastewater pipe 32, which is convenient for the treated wastewater discharge device to be subsequently processed or discharged.

[0050] If the chloride ion content of the wastewater sampled and analyzed by sampling valve 17 does not meet process requirements, it is returned to flocculation reaction tank 8 via return pump 34 for further chloride ion removal. The return device, comprising return pipe 33 and return pump 34, is used to quickly and efficiently return substandard wastewater to the reaction flocculation unit for further treatment. This process is repeated until the chloride ion content in the wastewater meets the requirements, at which point the wastewater is finally discharged from wastewater pipe 32 into the storage tank.

[0051] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A chlorine-containing wastewater treatment device, characterized in that: It includes reaction flocculation device, solid-liquid sedimentation separation device, filtration and slag discharge device and return device; The reaction flocculation device comprises a flocculation reaction tank (8), a cylindrical drum (6) located inside the flocculation reaction tank (8), a barrel support (7) supporting the cylindrical drum (6) and the flocculation reaction tank (8), a solid feeding device, and an air distribution plate (4) located at the bottom of the flocculation reaction tank (8); The solid-liquid sedimentation separation device comprises a sedimentation tank (19), wherein a plurality of baffles (15) are vertically installed inside the sedimentation tank (19), a plurality of sedimentation plates (18) are installed outside the baffles (15), a clear liquid outlet (16) is provided on one side of the upper portion of the sedimentation tank (19), a sampling valve (17) is installed at the clear liquid outlet (16), and a sight glass (22) is installed on the outer wall of the sedimentation tank (19); The filtering and slag discharge device comprises a stirring device, a liquid pipe (27), a solid pipe (28), a filter screen (25), a solid discharge valve (29) and a vacuum box (24); the bottom end of the solid pipe (28) is provided with a solid outlet (31); the bottom end of the liquid pipe (27) is connected to a filtrate pipe (30); The return device comprises a return pipe (33) and a return pump (34), and is used to return the wastewater that does not meet the standards to the reaction flocculation device for further treatment.

2. The chlorine-containing wastewater treatment device according to claim 1, characterized in that: The cylinder (6) has a body thickness of 3-10 mm, is covered with circular holes (9) with a diameter of 1-4 mm, and has an opening rate of 90-95%. The bottom end of the cylinder (6) is connected to a wastewater pipe (1), and the output end of the return pump (34) is connected to the wastewater pipe (1).

3. The chlorine-containing wastewater treatment device according to claim 1, characterized in that: The surface of the air distribution plate (4) is provided with a plurality of air distribution holes (5), one end of the air distribution plate (4) is connected to a compressed air pipe (2), a ball valve (3) is installed on the compressed air pipe (2), and the air distribution plate (4) is circular.

4. The chlorine-containing wastewater treatment device according to claim 1, characterized in that: The solid feeding device comprises a screw conveyor (12), one end of which is driven by a feeding motor (10), a feeding port (11) is provided at the top of the screw conveyor (12), and a discharge end of the screw conveyor (12) is connected to the top of the cylindrical barrel (6).

5. The chlorine-containing wastewater treatment device according to claim 1, characterized in that: The top of the flocculation reaction tank (8) is connected to a tail gas outlet (13), and an overflow port (14) is provided on one side of the upper portion of the flocculation reaction tank (8).

6. The chlorine-containing wastewater treatment device according to claim 1, characterized in that: The stirring device comprises a stirring paddle (26), the top end of which is driven to rotate by a V-belt (20), a pulley (21) and a stirring motor (23).

7. The chlorine-containing wastewater treatment device according to claim 1, characterized in that: The bottom end of the filtrate tube (30) is connected to a return pipe (33), and one side of the filtrate tube (30) is also connected to a dechlorination wastewater pipe (32).

8. The chlorine-containing wastewater treatment device according to claim 1, characterized in that: The bottom end of the vacuum box (24) is connected to a vacuum tank (36) via a vacuum tube (35), and one side of the vacuum tank (36) is connected to a vacuum pump (37).

9. The chlorine-containing wastewater treatment device according to claim 1, characterized in that: The barrel support (7) is divided into two layers and is located between the outer wall of the cylindrical barrel (6) and the inner wall of the flocculation reaction tank (8). Each layer has a plurality of support rods distributed radially, and the support rods connect the cylindrical barrel (6) and the flocculation reaction tank (8).

10. The chlorine-containing wastewater treatment device according to claim 1, characterized in that: The settling plate (18) and the baffle (15) form an angle of 30-45 degrees.

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