A heavy metal wastewater treatment device

Abstract

This invention discloses a heavy metal wastewater treatment device, relating to the field of wastewater treatment technology. It includes a treatment tank and a reagent dosing device for adding reagents to the treatment tank. It also includes a rotating shaft, at least one stirring and separating unit, and a sediment collection box. The rotating shaft is coaxially mounted within the treatment tank. At least one stirring and separating unit is fixed to the rotating shaft and includes a spiral stirring and separating plate fixedly mounted on the rotating shaft, and a hollow spiral conveying rib disposed on the outer spiral edge of the spiral stirring plate. A continuous spiral fluid channel is formed inside the hollow conveying component. The water-facing surface of the spiral stirring and separating plate has interception and guiding grooves uniformly formed along the height direction of the treatment tank. This invention uses a single drive unit for the entire stirring, interception, conveying, and filtering structure, eliminating the need for additional auxiliary equipment such as circulating pumps. This results in higher integration, a compact structure, a smaller footprint, reduced equipment manufacturing investment and daily operating energy consumption, and improved overall wastewater treatment efficiency.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a heavy metal wastewater treatment device. Background Technology

[0002] With the continuous development of industries such as electroplating, metallurgy, and mining, a large amount of heavy metal wastewater is continuously generated during the production process. Various heavy metal ions in this wastewater are highly toxic, difficult to biodegrade, and easily accumulate along the food chain. If discharged directly without adequate purification, it will severely disrupt the ecological balance of aquatic bodies and cause irreversible damage to human health. Currently, the industry commonly uses chemical precipitation to treat heavy metal wastewater. This involves adding heavy metal chelating agents and flocculants to the water to induce a reaction between heavy metal ions and the water, forming insoluble solid flocs. This is followed by stirring, filtration, and sediment collection to achieve solid-liquid separation and ensure the wastewater meets discharge standards. However, in practical applications, the formation of solid precipitates from the metal ions takes time, and the natural settling of the precipitates also requires a long settling period. The overall process is time-consuming, resulting in low wastewater treatment efficiency.

[0003] A search of Chinese Patent Publication No. CN119080112B reveals an apparatus and method for treating heavy metal wastewater. The apparatus consists of a closed reaction cylinder as its main body, with a wastewater inlet and a reagent inlet at the top. A drain pipe with a control valve is installed on the side wall. Inside the cylinder, a hollow rotating shaft is driven by a motor. Multiple sets of hollow stirring plates are arranged along the height direction on the outside of the rotating shaft. The stirring plates are respectively provided with water inlets and drain holes, which can guide the water containing heavy metal solid particles into the hollow rotating shaft and transport it downward while stirring and mixing the reagent and wastewater. The bottom of the reaction cylinder is divided into a water collection tank and a waste collection tank by a partition. An inclined filter plate is installed above the partition, and an external circulation pump is used to achieve water circulation filtration. Finally, the heavy metal solids that settle out are intercepted by a collection box placed in the tank.

[0004] While the existing device can simultaneously perform reagent mixing, water circulation filtration, and heavy metal solid collection, thus shortening the settling time to some extent, it still has significant shortcomings in long-term industrial use. The equipment adopts a top-down, direct-flow slag conveying structure, making it prone to heavy metal flocs adhering and accumulating on the inner wall of the hollow rotating shaft and at the drainage holes of the mixing plate. After prolonged continuous operation, channel blockage is highly likely, requiring frequent shutdowns and disassembly for cleaning, severely reducing the equipment's effective operating time. The mixing plate passively absorbs solid particles from the water through its openings, lacking a dedicated structure for directional capture of fine flocs. A large number of small heavy metal flocs cannot be effectively retained and repeatedly circulate within the cylinder with the circulating water, further lengthening the overall treatment cycle and causing unstable heavy metal content in the effluent, making it difficult to consistently meet standards.

[0005] In addition, the sediment collection box of the device is located in the waste collection tank at the bottom of the equipment. When cleaning the sludge, the material outlet at the bottom of the cylinder needs to be opened. The overall sealing structure of the cylinder is complicated to disassemble and assemble. The cleaning operation will also stir up the wastewater that is undergoing flocculation reaction inside the cylinder. Each time sludge is discharged, the entire machine needs to be shut down, which cannot meet the production conditions of the factory for uninterrupted and continuous wastewater treatment. Summary of the Invention

[0006] The purpose of this invention is to provide a heavy metal wastewater treatment device to solve the problems mentioned in the background art.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0008] The present invention provides a heavy metal wastewater treatment device, comprising a treatment tank and a reagent dosing device for adding reagents to the treatment tank, and further comprising:

[0009] A rotating shaft is coaxially mounted inside the treatment tank and is connected to the drive unit for transmission.

[0010] At least one stirring and separating unit is fixed on the rotating shaft. The stirring and separating assembly includes a spiral stirring and separating plate fixed on the rotating shaft and a hollow spiral conveying rib disposed on the outer spiral edge of the spiral stirring plate. A continuous spiral fluid channel is formed inside the hollow conveying component. The water-facing surface of the spiral stirring and separating plate is uniformly provided with intercepting and guiding grooves along the height direction of the treatment tank. One end of the intercepting and guiding grooves is connected to the spiral fluid channel. A first-stage filter hole is uniformly provided through the spiral stirring blades in the area where the intercepting and guiding grooves are located.

[0011] A sediment collection box is detachably installed at the top of the hollow spiral conveyor rib. The sediment collection box is connected to the feed inlet at the top opening of the spiral fluid channel. Multiple secondary filter holes are evenly provided through the side wall of the sediment collection box.

[0012] Furthermore, the cross-section of the intercepting guide groove is V-shaped or trapezoidal, with its opening facing the rotation direction of the spiral stirring blades, and the bottom of the groove inclined from the inside out towards the spiral fluid channel side.

[0013] Furthermore, the depth of the intercepting and guiding channel gradually decreases from the inside to the outside.

[0014] Furthermore, a gap of 0.5-2cm is left between the outer spiral edge of the hollow spiral conveying rib and the inner wall of the treatment pool.

[0015] Furthermore, the cross-section of the spiral fluid channel is rectangular, and a liquid collection hood is provided at its bottom opening along the radial direction of the treatment tank. A guide slope is formed inside the liquid collection hood to guide the spiral fluid channel toward the bottom opening.

[0016] Furthermore, the top of the hollow spiral conveyor rib is provided with an arc-shaped extension section, and the top of the arc-shaped extension section is vertically provided with an insertion hole; the sediment collection box is inserted into the insertion hole, and its bottom feed port is correspondingly connected to the internal channel of the arc-shaped extension section; the top of the sediment collection box is provided with a detachable sealing cover plate, and a handle is fixedly provided on the sealing cover plate.

[0017] Furthermore, the driving device is a geared motor, which is fixedly installed on the top of the treatment tank by a horizontal bracket.

[0018] Furthermore, the normal operating liquid level in the treatment tank is lower than the top surface of the stirring and separating assembly.

[0019] Furthermore, the bottom of the treatment tank is provided with a drain outlet for discharging treated clean water; the outlet pipe of the reagent dosing device extends into the treatment tank.

[0020] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects:

[0021] 1. This invention uses a spiral stirring and separating plate combined with a hollow spiral conveying rib to form a spiral fluid channel. Relying on the centrifugal force and spiral lift generated by the rotation, the heavy metal flocs are continuously lifted and conveyed from bottom to top. The flocs continue to rise with the rotation force, which can greatly avoid the accumulation and blockage of drainage holes and conveying channels, reduce the frequency of equipment shutdown for disassembly and cleaning, and significantly improve the continuous operation time of the equipment.

[0022] 2. The spiral stirring separator of this invention has multiple interception and guide channels on the water-facing surface, which can actively capture heavy metal flocs of various sizes in the water flow and direct them into the spiral fluid channel by centrifugal force. This greatly improves the interception effect of fine flocs, reduces the phenomenon of fine flocs flowing back and forth with the water body, and shortens the overall water treatment cycle.

[0023] 3. The present invention adopts an open vertical treatment tank design. The sediment collection box can be detachably installed on the top of the hollow spiral conveyor. Operators can directly complete the disassembly and cleaning operations from the top of the tank without opening the bottom sealed material outlet. The cleaning operation will not disturb the flocculation reaction system in the tank and does not require the entire machine to be shut down, which greatly improves the convenience of equipment operation and maintenance.

[0024] 4. The entire mixing, interception, conveying, and filtering structure of this invention uses a single drive unit, eliminating the need for additional auxiliary equipment such as circulating pumps. This results in higher equipment integration, a more compact structure, and a smaller footprint, reducing equipment manufacturing costs and daily operating energy consumption. The hollow spiral conveyor ridges have a reasonable gap with the pool wall, and the rotation process generates scouring turbulence, reducing floc adhesion and deposition on the pool wall, further optimizing the internal circulation flow field, and improving the overall wastewater treatment efficiency.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0026] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the present invention with the protective housing of the drive device removed;

[0029] Figure 3 This is a first-view structural schematic diagram of the stirring and separating unit and the rotating shaft of the present invention;

[0030] Figure 4 This is a schematic diagram of the stirring and separating unit and the rotating shaft from a second perspective of the present invention;

[0031] Figure 5 This is the present invention. Figure 4 Schematic diagram of a partial structure of the flow guide channel at point A;

[0032] Figure 6 This is a schematic diagram of the precipitate collection box and the arc-shaped extension section of the present invention.

[0033] In the picture:

[0034] 1-Treatment tank; 2-Rotating shaft; 3-Stirring and separation unit; 31-Spiral stirring and separation plate; 311-Interception guide channel; 312-First-stage filter hole; 32-Hollow spiral conveying rib; 321-Spiral fluid channel; 33-Liquid collection hood; 331-Guide inclined surface; 34-Arc-shaped extension section; 4-Sediment collection box; 41-Feed inlet; 42-Second-stage filter hole; 43-Sealing cover plate; 44-Handle; 5-Drive device. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0036] Please see Figures 1-6The present invention provides a heavy metal wastewater treatment device, which mainly includes a treatment tank 1, a reagent dosing device, a rotating shaft 2, at least one stirring and separation unit 3, and a sediment collection box 4.

[0037] Treatment tank 1 is an open, vertical cylindrical structure, and the whole is made of high-strength materials that are resistant to acid and alkali corrosion. It can withstand the erosion of heavy metal wastewater and chemical agents of different properties such as acid and alkali for a long time, and is suitable for a variety of heavy metal wastewater treatment scenarios.

[0038] The upper side wall of the treatment tank 1 is provided with an inlet pipe, and the sewage to be treated can be continuously sent into the treatment tank 1 through the inlet pipe by means of a lift pump or gravity flow. The lower side wall of the treatment tank 1 is provided with a drain pipe, and the drain pipe is equipped with a control valve to regulate the outflow rate and the discharge of the treated water.

[0039] The chemical dosing device (not shown) is independently installed on the external side of treatment tank 1. It mainly consists of a chemical storage tank, a metering pump, a delivery pipeline, and an online automatic control unit. The delivery pipeline extends downwards from the open top of treatment tank 1 into the tank. During operation, the chemical dosing device can accurately and quantitatively add treatment chemicals through the metering pump, based on online monitoring data of influent flow rate, influent heavy metal concentration, and effluent water quality. This achieves precise dosing, improves chemical utilization while ensuring treatment effectiveness, and avoids waste and secondary pollution caused by excessive chemical dosing.

[0040] The rotating shaft 2 is vertically and coaxially mounted in the center of the treatment tank 1. Its bottom end is rotatably mounted on the bottom of the treatment tank 1 through a bearing seat, and its top end is rotatably supported by a support crossbeam erected above the treatment tank 1 and is connected to the drive device 5 for transmission.

[0041] In this embodiment, the drive device 5 is a geared motor, which is fixedly installed on the top of the treatment tank 1 by a horizontal bracket; the geared motor can output a stable low speed and high torque, driving the rotating shaft 2 to rotate at a set speed.

[0042] The stirring and separating unit 3 is fixedly mounted on the rotating shaft 2 and rotates synchronously with the rotating shaft 2. The stirring and separating unit 3 includes a spiral stirring and separating plate 31 and a hollow spiral conveying rib 32.

[0043] The spiral stirring and separating plate 31 is continuously spirally fixed around the outer wall of the rotating shaft 2, and the whole spirals upward from bottom to top. The whole is made of high-strength corrosion-resistant material, with sufficient strength and rigidity, and can withstand the impact of water flow and the friction of sediment during the stirring process. It is not easily deformed or damaged during long-term operation.

[0044] The hollow spiral conveying rib 32 extends continuously along the outer spiral edge of the spiral stirring and separating plate 31. It can be integrally formed with the spiral stirring and separating plate 31, or it can be fixedly connected as a whole by welding or other methods.

[0045] The hollow spiral conveying rib 32 forms a continuous spiral fluid channel 321 inside. The spiral fluid channel 321 extends from bottom to top along the spiral trajectory. The bottom and top ends of the spiral fluid channel 321 are open structures, with the bottom opening being the liquid inlet and the top opening being the liquid outlet. The liquid inlet is set towards the rotation direction of the rotating shaft 2.

[0046] When the rotating shaft 2 drives the hollow spiral conveyor 32 and the spiral stirring and separating plate 31 to move in a circular motion around the axis, the inlet facing the direction of rotation will create a countercurrent effect. Under the combined action of water inertia and centrifugal force, the mixed liquid containing heavy metal precipitates in the treatment tank 1 will continuously flow into the spiral fluid channel 321 from the inlet. The fluid entering the spiral fluid channel 321 will cause the denser heavy metal precipitates to adhere to the outer wall of the spiral fluid channel 321 due to centrifugal force. At the same time, the spiral helix structure of the spiral fluid channel 321 itself will convert the rotational motion into the axial lift of the fluid. Combined with the countercurrent effect, the solid-liquid mixture in the spiral fluid channel 321 will continuously flow from bottom to top and finally be discharged from the outlet at the top.

[0047] On the water-facing side of the spiral stirring and separating plate 31, i.e., the side wall that first contacts the water flow during rotation, multiple intercepting and guiding channels 311 are evenly opened along the height direction of the treatment tank 1. The outer end of each intercepting and guiding channel 311 is connected to the corresponding spiral fluid channel 321. When the spiral stirring and separating plate 31 rotates synchronously with the rotating shaft 2, the wastewater containing heavy metal precipitates in the treatment tank 1 continuously impacts the water-facing side of the blade. The intercepting and guiding channels 311 can efficiently capture the heavy metal precipitate particles generated after the reaction of the reagents. Under the combined action of the water flow thrust and the centrifugal force of rotation, the captured precipitates flow outward along the intercepting and guiding channels 311 and flow into the spiral fluid channel 321 inside the hollow spiral conveying ridge 32, and are transported upward together with the fluid in the spiral fluid channel 321.

[0048] In the blade area where the interception and diversion channel 311 is opened, the spiral stirring and separating plate 31 is also uniformly provided with first-stage filter holes 312. The first-stage filter holes 312 allow water to flow freely, but can block flocculent sediments from passing through. During the stirring operation, the water in the treatment tank 1 can flow through the first-stage filter holes 312 to the other side of the spiral stirring and separating plate 31, so that the reagent and the sewage can be in more complete contact, significantly improving the mixing reaction efficiency.

[0049] The sediment collection box 4 is detachably installed at the top of the hollow spiral conveyor rib 32. An inlet 41 is provided on the side of the sediment collection box 4, which corresponds to and communicates with the liquid outlet at the top of the spiral fluid channel 321. The solid-liquid mixture output from the spiral fluid channel 321 can smoothly enter the sediment collection box 4. Multiple secondary filter holes 42 are evenly distributed through the side wall of the sediment collection box 4. The solid-liquid mixture entering the sediment collection box 4 rotates with the box. Under centrifugal force, the residual "clear water" in the mixture gathers on the side wall of the box and flows back into the treatment tank 1 through the secondary filter holes 42, while the heavy metal flocs are trapped inside the sediment collection box 4. Because the sediment collection box 4 has a detachable structure, combined with the open design of the treatment tank 1, operators can directly remove the collection box from the top of the tank and periodically clean the accumulated heavy metal sediment inside. Daily maintenance of the equipment is simple, and there is no need to stop the machine to drain the water in the treatment tank 1.

[0050] In some embodiments, the cross-section of the intercepting and guiding channel 311 can be any one of V-shape, trapezoid, arc, or rectangle, with the channel opening facing the rotation direction of the stirring blades. For example, in wastewater treatment scenarios where the sediment particle size is small, the cross-section of the intercepting and guiding channel 311 is V-shaped. The V-shaped cross-section of the intercepting and guiding channel 311 has a wide opening and a narrow bottom, resulting in a stronger ability to capture fine sediments and effectively intercept tiny heavy metal flocs. Conversely, for conditions with high influent impurity content and large sediment production, the cross-section of the intercepting and guiding channel 311 is trapezoidal. The trapezoidal cross-section of the intercepting and guiding channel 311 has an inclined wall, making it less prone to clogging, and allowing for good sediment flow within the channel.

[0051] In this embodiment, the intercepting guide channel 311 is rectangular. The rectangular cross-section intercepting guide channel 311 has a simple processing technology, low manufacturing cost, and is easy to mass-produce and apply.

[0052] Furthermore, the depth of the intercepting and guiding channel 311 gradually decreases from the inside to the outside, and the intercepting and guiding channel 311 is inclined upward along the radial direction of the rotation axis 2 from the inside to the outside. This structure can guide the captured sediment to automatically converge at the connection between the intercepting and guiding channel 311 and the spiral fluid channel 321 by means of centrifugal force and gravity. When the spiral stirring and separating plate 31 rotates, the sediment moves to the outside of the tank under the action of centrifugal force. With the inclined channel that is shallow on the outside and gradually deepens inward, the sediment can be pushed smoothly into the spiral fluid channel 321 along the tank, effectively avoiding the sediment from accumulating and stagnating in the intercepting and guiding channel 311 and improving the sediment transport efficiency.

[0053] Furthermore, a predetermined gap is reserved between the outer spiral edge of the hollow spiral conveyor 32 and the inner wall of the treatment tank 1. The predetermined gap is 0.5 to 2 cm. This gap setting has multiple functions. Specifically, firstly, it can avoid friction and collision between the hollow spiral conveyor 32 and the inner wall of the tank during rotation, ensuring the stability and safety of equipment operation and extending the service life of components; secondly, the rotating hollow spiral conveyor 32 can drive the water flow in the gap to form local turbulence, flushing the sediment attached to the inner wall and causing it to return to the main water flow to be captured by the interception and guide channel 311, reducing the amount of sediment deposited on the tank wall.

[0054] In a preferred embodiment, the spiral fluid channel 321 has a rectangular cross-section, and a collection hood 33 extending radially along the treatment tank 1 is provided at its bottom inlet. Inside the collection hood 33, a guide slope 331 is formed to guide the flow towards the bottom opening of the spiral fluid channel 321. The collection hood 33 expands the collection range at the bottom of the spiral fluid channel 321, effectively collecting heavy metal precipitates that have settled to the bottom of the treatment tank 1. The guide slope 331 guides the collected solid-liquid mixture, allowing it to flow smoothly into the spiral fluid channel 321, preventing precipitates from accumulating at the inlet, significantly improving the collection and transport efficiency of bottom precipitates, and reducing the residue of sediment at the bottom of the tank.

[0055] Furthermore, the top of the hollow spiral conveyor rib 32 is provided with an arc-shaped extension section 34, and the top of the arc-shaped extension section 34 is vertically provided with an insertion hole; the sediment collection box 4 is inserted and assembled into the insertion hole, and its side inlet 41 is connected to the internal channel of the arc-shaped extension section 34. The top of the sediment collection box 4 is provided with a removable sealing cover plate 43, and a handle 44 is fixedly installed on the sealing cover plate 43. The arc-shaped extension section 34 allows the solid-liquid mixture to smoothly transition into the sediment collection box 4, avoiding sediment accumulation and blockage at the top of the channel due to abrupt changes in flow direction; the plug-in assembly method, combined with the top handle 44, makes the installation and disassembly of the collection box very convenient. Combined with the structure of the open-type treatment tank 1, the operator can directly lift the collection box from the top of the tank for cleaning without disassembling other parts, greatly reducing maintenance difficulty and operation time.

[0056] Based on this, various methods such as snap-fit, bolt or magnetic attraction can be used to increase the stability of the connection between the sediment collection box 4 and the arc-shaped extension section 34 to adapt to different usage requirements.

[0057] Furthermore, the normal operating liquid level in the treatment tank 1 is lower than the top surface of the stirring and separating unit 3. This liquid level setting allows the upper structure of the spiral stirring and separating plate 31 and the hollow spiral conveying rib 32 to be exposed above the liquid surface, preventing the sediment output from the spiral fluid channel 321 from being washed back into the treatment tank 1 by the surface water flow.

[0058] Working principle: During operation, the wastewater containing heavy metals to be treated is continuously fed into the treatment tank 1 through the inlet pipe. The reagent dosing device adds the corresponding treatment reagents to the treatment tank 1 in a quantitative manner according to the water quality and quantity parameters of the inlet water. The drive device 5 drives the rotating shaft 2 and the stirring and separation unit 3 to rotate at a set speed. The spiral stirring and separation plate 31 stirs the water to form turbulence, so that the reagents and wastewater are fully mixed and contacted. The heavy metal ions in the wastewater react with the reagents to gradually form flocculent precipitates. During the rotation, the interception and guide channel 311 on the water-facing side of the spiral stirring and separation plate 31 continuously captures the precipitates in the water. The flocculent sediment, combined with the liquid collection hood 33 at the bottom of the spiral fluid channel 321, collects the sediment at the bottom of the pool in the opposite direction, continuously drawing the solid-liquid mixture containing heavy metal sediment into the spiral fluid channel 321. Under the combined action of centrifugal force and axial lift generated by the spiral angle structure, the solid-liquid mixture is continuously lifted and transported upward along the spiral fluid channel 321, and finally discharged from the top of the channel into the sediment collection box 4. The solid-liquid mixture entering the collection box rotates synchronously with the box, and the clear liquid flows back into the treatment pool 1 through the second-stage filter hole 42, while the heavy metal sediment is trapped in the collection box.

[0059] After treatment, the clean water is discharged through the bottom drain pipe according to operational needs. During daily operation and maintenance, operators can directly remove the sediment collection box 4 from the top of the tank, clean the accumulated heavy metal sediment inside, and then reset it. The operation and maintenance process is simple and efficient, effectively reducing the operation and maintenance costs of the equipment.

[0060] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A heavy metal wastewater treatment device, comprising a treatment tank and a reagent dosing device for adding reagents to the treatment tank, characterized in that, Also includes: A rotating shaft is coaxially mounted inside the treatment tank and is connected to the drive unit for transmission. At least one stirring and separating unit is fixed on the rotating shaft. The stirring and separating assembly includes a spiral stirring and separating plate fixed on the rotating shaft and a hollow spiral conveying rib disposed on the outer spiral edge of the spiral stirring plate. A continuous spiral fluid channel is formed inside the hollow conveying component. The water-facing surface of the spiral stirring and separating plate is uniformly provided with intercepting and guiding grooves along the height direction of the treatment tank. One end of the intercepting and guiding grooves is connected to the spiral fluid channel. A first-stage filter hole is uniformly provided through the spiral stirring blades in the area where the intercepting and guiding grooves are located. A sediment collection box is detachably installed at the top of the hollow spiral conveyor rib. The sediment collection box is connected to the feed inlet at the top opening of the spiral fluid channel. Multiple secondary filter holes are evenly provided through the side wall of the sediment collection box.

2. The heavy metal wastewater treatment device according to claim 1, characterized in that, The cross-section of the intercepting guide groove is V-shaped or trapezoidal, and its opening faces the rotation direction of the spiral stirring blade.

3. The heavy metal wastewater treatment device according to claim 1, characterized in that, The depth of the intercepting guide groove gradually decreases from the inside to the outside, and the intercepting guide groove is inclined upward along the radial direction of the rotation axis from the inside to the outside.

4. The heavy metal wastewater treatment device according to claim 3, characterized in that, A gap of 0.5-2cm is left between the outer spiral edge of the hollow spiral conveyor and the inner wall of the treatment tank.

5. The heavy metal wastewater treatment device according to claim 3, characterized in that, The spiral fluid channel has a rectangular cross-section, and a liquid collection hood is provided at its bottom opening along the radial direction of the treatment tank. A guide slope is formed inside the liquid collection hood to guide the spiral fluid channel toward the bottom opening.

6. The heavy metal wastewater treatment device according to claim 1, characterized in that, The top of the hollow spiral conveyor rib is provided with an arc-shaped extension section, and the top of the arc-shaped extension section is vertically provided with an insertion hole; the sediment collection box is inserted into the insertion hole, and its bottom feed port is connected to the internal channel of the arc-shaped extension section; the top of the sediment collection box is provided with a detachable sealing cover plate, and a handle is fixedly provided on the sealing cover plate.

7. The heavy metal wastewater treatment device according to claim 1, characterized in that, The drive device is a geared motor, which is fixedly installed on the top of the treatment tank by a horizontal bracket.

8. The heavy metal wastewater treatment device according to claim 1, characterized in that, The normal operating liquid level in the treatment tank is lower than the top surface of the stirring and separating assembly.

9. The heavy metal wastewater treatment device according to claim 1, characterized in that, The bottom of the treatment tank is provided with a drain outlet for discharging treated clean water; the outlet pipe of the reagent dosing device extends into the treatment tank.

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