A circulating treatment device and method for arsenic-containing wastewater

Abstract

The application discloses a circulating treatment device and method for arsenic-containing wastewater, and relates to the technical field of environmental protection and wastewater treatment. The device comprises a sedimentation tank, a discharge port is formed in the lower part of the sedimentation tank, a lower discharge pipe is fixedly connected to the upper part of the sedimentation tank in a penetrating mode, an inlet pipe is fixedly connected to the outer end of the lower discharge pipe, a water outlet pipe is fixedly connected to the side of the sedimentation tank close to the lower discharge pipe in a penetrating mode, a separation disc is slidably connected to the lower discharge pipe, the separation disc is fixedly connected to a sealing frame for blocking the discharge port, and a circulating pipe is fixedly connected to the upper part of the sedimentation tank in a penetrating mode. The intermediate interlayer water in the sedimentation tank is input into the inlet pipe upwardly through a turbine, so that the intermediate interlayer water is mixed with an alkaline solution for secondary circulation, flocculation and precipitation reaction. The device can effectively utilize the components that have not been completely reacted, improve the utilization rate of chemical agents, reduce waste, reduce the arsenic content of the effluent, reduce the pressure of subsequent treatment, improve the overall treatment efficiency, and protect the environment.

Description

Technical Field

[0001] This invention relates to the technical fields of environmental protection and wastewater treatment, and in particular to a recycling treatment device and method for arsenic-containing wastewater. Background Technology

[0002] To protect the environment, it is necessary to remove arsenic from industrial or mining wastewater to address water pollution. When treating arsenic-containing wastewater, a series of physical and chemical methods are typically used to convert the arsenic in the wastewater into insoluble compounds and precipitate it. At the same time, a deep purification unit may be installed to ensure that the effluent meets the discharge standards, and the arsenic-containing sludge generated is safely disposed of to prevent secondary pollution.

[0003] In actual treatment processes, arsenic-containing wastewater is typically directed to a sedimentation tank via an injection pipe, while an alkaline solution is introduced into the injection pipe through a pipeline. As the arsenic-containing wastewater flows through the injection pipe, it mixes with the alkaline solution before flowing together into the sedimentation tank for flocculation. After sedimentation by the alkaline solution, the flocs separate from the water, forming upper and lower strata. The water mixed at the boundary between these strata is often referred to as "intermediate layer water" or "intercalated water." This intercalated water may contain unreacted arsenic elements and alkaline reagent components, which not only affects the quality of the effluent but also leads to reagent waste, reduced treatment efficiency, and decreased resource utilization. Summary of the Invention

[0004] In order to overcome the shortcomings mentioned in the background art, the present invention provides a recycling treatment device and method for arsenic-containing wastewater.

[0005] A circulating treatment device for arsenic-containing wastewater includes a sedimentation tank with a discharge port at the bottom and a feed pipe fixedly connected to the upper part of the sedimentation tank. An inlet pipe is fixedly connected to the outer end of the feed pipe. A effluent pipe is fixedly connected to the side of the sedimentation tank near the feed pipe. A partition plate is slidably connected to the feed pipe, and a sealing frame for blocking the discharge port is fixedly connected to the partition plate. A circulation pipe is fixedly connected to the upper part of the sedimentation tank and communicates with the inlet pipe. The circulation pipe has a first inlet for inputting intermediate interlayer water and a second inlet for inputting an alkaline solution. A pipe for inputting the alkaline solution is connected to the second inlet end of the circulation pipe. The circulation pipe is fixed to the inlet pipe by clamps. A turbine pump is installed inside the circulation pipe.

[0006] Optionally, it also includes a baffle, which is fixed to the side of the feed pipe near its outlet end.

[0007] Optionally, the baffle and the sealing frame are slidably connected.

[0008] Optionally, it also includes a guide frame for guiding arsenic-containing wastewater upward to the separator plate, the guide frame being fixed circumferentially to the baffle frame.

[0009] Optionally, the guide frame is configured as a hollow frustum shape that is wider at the top and narrower at the bottom.

[0010] Optionally, it also includes a ring suction pipe, which is slidably connected to the circulation pipe and has circumferentially distributed suction ports.

[0011] Optionally, it also includes a flow sensor, which is fixed to the side of the circulation pipe near the inside of the feed pipe, and the flow sensor is electrically connected to the turbine pump through the control module.

[0012] Optionally, it also includes a slide, which is slidably connected to the side of the circulation pipe near the second inlet. The side of the slide near the second inlet has a feed port, and the second inlet communicates with the inside of the circulation pipe through the feed port. A baffle plate is fixedly connected in the middle of the slide, and springs symmetrically distributed along the slide are fixedly connected between the slide and the circulation pipe.

[0013] Optionally, the feed inlet is configured as a fan shape, with the top narrower than the bottom.

[0014] A method for the recycling treatment of arsenic-containing wastewater includes the following steps: S1. Inject arsenic-containing wastewater into the feed pipe and connect the external pipe for conveying alkaline solution to the second inlet end of the circulation pipe; S2. Place a container for collecting the discharged material below the discharge port, and connect the water outlet pipe to the next stage of deep purification unit. S3. Start the turbo pump.

[0015] The beneficial effects of this invention are as follows: This invention uses a turbine to pump the interlayer water in the middle of the sedimentation tank upward into the feed pipe, allowing it to undergo a secondary circulation mixing and flocculation sedimentation reaction with the alkaline solution. This effectively utilizes the components that have not yet fully reacted, improves the utilization rate of chemical agents, reduces waste, lowers the arsenic content of the effluent, reduces the pressure on subsequent treatment, improves overall treatment efficiency, and protects the environment.

[0016] This invention limits the amount of sediment accumulation by setting a sealing frame and a separator plate, so that the intermediate interlayer water is stably limited to a range near the bottom of the circulation pipe, avoiding the intermediate interlayer water height from being higher than the first inlet at the bottom of the circulation pipe, which would lead to circulation failure.

[0017] This invention provides a baffle frame below the outlet end of the feed pipe to prevent arsenic-containing wastewater discharged through the feed pipe from acting downward on the sealing frame due to water impact force, which would make it difficult for the separator plate to be pushed upward by the sediment.

[0018] This invention, by setting up a guide frame, disperses the water falling on the baffle frame upwards in a circumferential direction. On the one hand, it can backwash the separator plate to prevent the separator plate from being blocked by sediment. On the other hand, it can prevent the wastewater from washing away the sediment downwards, so that the formation of sediment is not affected, and at the same time, it can prevent the sediment from mixing into the upper water.

[0019] This invention, by setting up a ring suction pipe, enables it to uniformly draw the intermediate interlayer water into the circulation pipe in a circumferential direction through the suction port, thereby increasing the adsorption range of the interlayer water and making it more efficient. Moreover, it can dynamically move into the intermediate interlayer water range.

[0020] This invention can dynamically adjust the flow rate of the intermediate jacket water into the feed pipe according to the flow rate of the arsenic-containing wastewater in the feed pipe, and can also dynamically adjust the feed rate of the alkaline solution according to the flow rates of the arsenic-containing wastewater and the intermediate jacket water, so that the three are matched. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is a three-dimensional structural diagram of the sedimentation tank, feed pipe, and discharge pipe of the present invention.

[0023] Figure 3 This is a three-dimensional structural diagram of the components of the present invention, such as the circulation pipe, clamp, and turbine pump.

[0024] Figure 4 This is a three-dimensional structural diagram of the components of the present invention, such as the feed tube, the baffle, and the guide.

[0025] Figure 5 This is a three-dimensional structural diagram showing the separation of the separator, sealing frame, baffle, and guide frame of the present invention.

[0026] Figure 6 This is a three-dimensional structural diagram of the components of the present invention, such as the separator, the ring suction tube, and the circulation tube.

[0027] Figure 7 This is a three-dimensional structural diagram of the flow sensor, slide, and spring components of the present invention.

[0028] Figure 8 This is a three-dimensional structural diagram of the carriage and baffle of the present invention.

[0029] The markings in the attached diagram are as follows: 1: Sedimentation tank, 101: Discharge port, 2: Feed pipe, 3: Feed outlet pipe, 4: Water outlet pipe, 5: Divider plate, 6: Sealing frame, 7: Circulation pipe, 701: First inlet, 702: Second inlet, 8: Clamp, 9: Turbine pump, 10: Baffle frame, 11: Guide frame, 12: Ring suction pipe, 13: Suction port, 14: Flow sensor, 15: Slide, 151: Feed port, 152: Baffle plate, 16: Spring. Detailed Implementation

[0030] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0031] Example 1: A circulating treatment device for arsenic-containing wastewater, such as... Figures 1-3 As shown, the system includes a sedimentation tank 1 with an outlet 101 at its lower part. Arsenic-containing precipitates are discharged downwards through the outlet 101. A feed pipe 3 is longitudinally and fixedly connected to the middle of the upper part of the sedimentation tank 1, through which arsenic-containing wastewater enters the sedimentation tank 1. An inlet pipe 2 is fixedly connected to the top outer end of the feed pipe 3, through which arsenic-containing wastewater enters the feed pipe 3. An outlet pipe 4 is fixedly connected to the upper right side of the sedimentation tank 1. A partition plate 5 is slidably connected to the lower part of the feed pipe 3. The partition plate 5 is located inside the sedimentation tank 1, and a sealing frame 6 is fixedly connected to the middle of the bottom of the partition plate 5. 6. Block the outlet 101 downwards, and open the outlet 101 upwards with the sealing frame 6. A circulation pipe 7 is longitudinally fixed to the upper left side of the sedimentation tank 1. The circulation pipe 7 is connected to the feed pipe 2. The bottom end of the circulation pipe 7 has a first inlet 701, which is used to input the intermediate interlayer water upwards. The upper left side of the circulation pipe 7 has a second inlet 702, which is used to input the alkaline solution to the right. Connect the pipe of the alkaline solution to the second inlet 702 end of the circulation pipe 7. Fix the circulation pipe 7 to the feed pipe 2 with the clamp 8. A turbine pump 9 is installed inside the circulation pipe 7.

[0032] Arsenic-containing wastewater is injected into feed pipe 2, and turbine pump 9 is started. Turbine pump 9 feeds alkaline solution upward into feed pipe 2 from the second inlet 702 on the upper left side of circulation pipe 7. Arsenic-containing wastewater and alkaline solution are mixed in feed pipe 2 and flow into sedimentation tank 1 through discharge pipe 3 for flocculation and sedimentation reaction. Arsenic-containing precipitate and arsenic-removing wastewater are separated into layers. The upper layer of arsenic-removing wastewater is discharged through effluent pipe 4 to the next stage of deep purification unit for further treatment, while the lower layer of arsenic-containing precipitate is discharged through discharge port 101.

[0033] During the above treatment process, when the turbine pump 9 starts, it also feeds the intermediate layer water in the sedimentation tank 1 upward into the feed pipe 2 from the first inlet 701 at the bottom of the circulation pipe 7. This allows the intermediate layer water to undergo secondary circulation mixing and flocculation sedimentation reaction with the alkaline solution. This can effectively utilize the components that have not yet fully reacted, improve the utilization rate of chemical agents, reduce waste, reduce the arsenic content of the effluent, reduce the pressure on subsequent treatment, improve the overall treatment efficiency, and protect the environment.

[0034] In addition, to ensure that the intermediate interlayer water is kept stable in the vicinity of the bottom of the circulation pipe 7, the outlet 101 of the sedimentation tank 1 is first blocked by the sealing frame 6, causing the arsenic-containing precipitate to accumulate at the bottom of the partition plate 5. When the arsenic-containing precipitate continues to increase, it pushes the partition plate 5 upward, causing the partition plate 5 to move the sealing frame 6 upward to open the outlet 101 of the sedimentation tank 1, automatically discharging a portion of the precipitate. This continues until the partition plate 5 moves the sealing frame 6 downward to close and open the outlet 101 of the sedimentation tank 1 again. In this way, by limiting the amount of precipitate accumulation, the intermediate interlayer water is kept stable in the vicinity of the bottom of the circulation pipe 7, preventing the intermediate interlayer water height from exceeding the first inlet 701 at the bottom of the circulation pipe 7, which would lead to circulation failure.

[0035] Example 2: Based on Example 1, such as Figures 4-6 As shown, it also includes a baffle 10, which is fixed to the side of the feed pipe 3 near its outlet end. The baffle 10 is slidably connected to the sealing frame 6. A guide frame 11 with a hollow frustum shape that is wider at the top and narrower at the bottom is fixedly connected to the baffle 10 along the circumferential direction. The guide frame 11 is used to guide the arsenic-containing wastewater falling on the baffle 10 upward to the separator plate 5. The lower part of the circulation pipe 7 is slidably connected to a ring suction pipe 12 in the vertical direction. The lower part of the ring suction pipe 12 has circumferentially distributed suction ports 13.

[0036] This invention prevents arsenic-containing wastewater discharged through the discharge pipe 3 from impacting the sealing frame 6 downwards with water force, thus preventing the separator plate 5 from being pushed upwards by sediment. By setting a guide frame 11, the water falling on the baffle frame 10 can be dispersed upwards circumferentially. On the one hand, this can backwash the separator plate 5, preventing it from being blocked by sediment. On the other hand, it can prevent the wastewater from dispersing the sediment downwards. Thus, the formation of sediment is not affected, and the sediment will not mix into the upper water. The ring suction pipe 12 can evenly suck the intermediate interlayer water into the circulation pipe 7 circumferentially through the suction port 13, increasing the adsorption range of the interlayer water and making it more efficient. At the same time, the ring suction pipe 12 can move up and down synchronously with the separator plate 5, so that it can dynamically move into the intermediate interlayer water range.

[0037] Example 3: Based on Example 2, such as Figure 7 and Figure 8 As shown, it also includes a flow sensor 14, which is fixed to the side of the circulation pipe 7 near the inside of the feed pipe 2. The flow sensor 14 is electrically connected to the turbine pump 9 through the control module. A slide 15 is slidably connected to the side of the circulation pipe 7 near the second inlet 702 in the vertical direction. The slide 15 near the second inlet 702 has a fan-shaped feed inlet 151 that is narrow at the top and wide at the bottom. The second inlet 702 communicates with the inside of the circulation pipe 7 through the feed inlet 151. A baffle plate 152 is fixed in the middle of the slide 15. Springs 16 are symmetrically distributed along the front and back of the slide 15 and the circulation pipe 7 are fixed between the slide 15 and the circulation pipe 7.

[0038] The flow sensor 14 detects the flow rate of the arsenic-containing wastewater injected into the feed pipe 2 and transmits the electrical signal to the control module. This causes the control module to control the turbine pump 9 to adaptively adjust the turbine speed, thereby dynamically adjusting the speed at which the intermediate interlayer water flows into the feed pipe 2. This ensures that the speed at which the intermediate interlayer water enters the feed pipe 2 matches the flow rate of the arsenic-containing wastewater in the feed pipe 2. Furthermore, the faster the intermediate interlayer water flows upward, the stronger the impact force on the baffle plate 152, resulting in a higher upward sliding height of the slide 15. This also increases the diameter of the orifice connecting the feed inlet 151 to the alkaline solution inlet of the circulation pipe 7, thus allowing more alkaline solution to flow in. In this way, the feed rate of the alkaline solution is dynamically adjusted according to the flow rates of the arsenic-containing wastewater and the intermediate interlayer water, ensuring that the three are matched.

[0039] Example 4: Based on Example 3, a recycling treatment method for arsenic-containing wastewater includes the following steps: S1. Inject arsenic-containing wastewater into feed pipe 2, and connect the external pipe for conveying alkaline solution to the second inlet 702 end of circulation pipe 7; S2. Place a container for collecting the discharged material below the discharge port 101, and connect the water outlet pipe 4 to the next stage of deep purification unit. S3, Start the turbine pump 9.

[0040] It should be understood that the above description is for illustrative purposes only and is not intended to limit the invention. Those skilled in the art will understand that variations of the invention are included within the scope of the claims herein.

Claims

1. A circulating treatment device for arsenic-containing wastewater, comprising a sedimentation tank (1), a discharge port (101) at the lower part of the sedimentation tank (1), a feed pipe (3) fixedly connected to the upper part of the sedimentation tank (1), a feed pipe (2) fixedly connected to the outer end of the feed pipe (3), and a water outlet pipe (4) fixedly connected to the side of the sedimentation tank (1) near the feed pipe (3), characterized in that: The feed pipe (3) is slidably connected to a partition plate (5), and the partition plate (5) is fixedly connected to a sealing frame (6) for blocking the outlet (101). The upper part of the sedimentation tank (1) is fixedly connected to a circulation pipe (7), which is connected to the feed pipe (2). The circulation pipe (7) has a first inlet (701) for inputting the intermediate interlayer water of the sedimentation tank (1), and a second inlet (702) for inputting alkaline solution. The pipe for inputting alkaline solution is connected to the second inlet (702) end of the circulation pipe (7). The circulation pipe (7) is fixed to the feed pipe (2) by a clamp (8). A turbine pump (9) is installed inside the circulation pipe (7). It also includes a baffle (10), which is fixed to the side of the feed pipe (3) near its outlet end; The baffle (10) and the sealing frame (6) are slidably connected; It also includes a guide frame (11) for guiding arsenic-containing wastewater upward to the separator plate (5), the guide frame (11) being fixed to the baffle frame (10) in the circumferential direction; The guide frame (11) is set as a hollow frustum shape that is wider at the top and narrower at the bottom.

2. The circulating treatment device for arsenic-containing wastewater according to claim 1, characterized in that: It also includes a ring suction pipe (12), which is slidably connected to the circulation pipe (7), and the ring suction pipe (12) has circumferentially distributed suction ports (13).

3. The circulating treatment device for arsenic-containing wastewater according to claim 2, characterized in that: It also includes a flow sensor (14), which is fixed to the side of the circulation pipe (7) near the inside of the feed pipe (2). The flow sensor (14) detects the flow rate of the arsenic-containing wastewater injected into the feed pipe (2). The flow sensor (14) is electrically connected to the turbine pump (9) through the control module.

4. The circulating treatment device for arsenic-containing wastewater according to claim 3, characterized in that: It also includes a slide (15), which is slidably connected to the circulation pipe (7) near the second inlet (702). The slide (15) has a feed port (151) on the side near the second inlet (702). The second inlet (702) communicates with the inside of the circulation pipe (7) through the feed port (151). A baffle plate (152) is fixedly connected in the middle of the slide (15). Springs (16) are symmetrically distributed along the slide (15) and fixed between the slide (15) and the circulation pipe (7).

5. A circulating treatment device for arsenic-containing wastewater according to claim 4, characterized in that: The feed inlet (151) is set in a fan shape, and the feed inlet (151) is narrow at the top and wide at the bottom.

6. A method for the recycling treatment of arsenic-containing wastewater, using the recycling treatment apparatus for arsenic-containing wastewater as described in any one of claims 1-5, comprising the following steps: S1. Inject arsenic-containing wastewater into the feed pipe (2) and connect the external pipe for conveying alkaline solution to the second inlet (702) end of the circulation pipe (7); S2. Place a container for collecting the discharged material below the discharge port (101) and connect the water outlet pipe (4) to the next level of deep purification unit. S3. Start the turbine pump (9).

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