Method for treating wastewater containing iron, arsenic, antimony and apparatus for treatment

Abstract

The application provides a wastewater treatment method and treatment equipment containing iron, arsenic and antimony, and relates to the field of water pollution control and treatment. The wastewater treatment method containing iron, arsenic and antimony comprises the following steps: S1, sequentially performing coarse filtration and ultrafiltration on the wastewater containing iron, arsenic and antimony; S2, performing reverse osmosis concentration treatment on the filtered wastewater again, and obtaining an enrichment liquid containing iron, arsenic and antimony; and S3, adding pyrite into the obtained iron-arsenic-antimony enrichment liquid, stirring and heating to obtain a reduction solution. The wastewater treatment method containing iron, arsenic and antimony can repair water bodies polluted by iron, arsenic and antimony, simultaneously realize harmless treatment and resource utilization of solid waste (distiller's grains, electrolytic manganese residue and the like), and achieve the purpose of treating pollution with waste; the adsorbent of the application adopts a one-step pyrolysis method, the process is simple, no chemical reagent needs to be added, the adsorbent is environmentally friendly, the adsorbent can be recycled, regenerated and reused, and the specific surface area and total pore volume of the adsorbent are large.

Description

Technical Field

[0001] This invention relates to the field of water pollution control and treatment, and in particular to a method and equipment for treating wastewater containing iron, arsenic and antimony. Background Technology

[0002] With rapid industrialization, antimony (Sb) and arsenic (As), as toxic heavy metals, are released into the environment in large quantities during mining and smelting activities, causing serious pollution to water bodies and soil. Antimony and arsenic have similar toxicity and geochemical properties, often existing as by-products, posing a serious threat to the ecological environment and human health. Iron (Fe), as an abundant metallic element in the Earth's crust, has wide applications in industrial production, such as steel manufacturing, the electronics industry, and catalysts.

[0003] However, in wastewater treatment, iron often coexists with metals such as antimony and arsenic, which increases the complexity and difficulty of wastewater treatment. Traditional wastewater treatment methods often cannot achieve effective separation and recovery of iron, arsenic and antimony at the same time, resulting in resource waste and environmental pollution.

[0004] Therefore, it is necessary to provide a method and equipment for treating wastewater containing iron, arsenic, and antimony to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides a method and equipment for treating wastewater containing iron, arsenic, and antimony, which solves the problem that traditional wastewater treatment methods often cannot achieve effective separation and recovery of iron, arsenic, and antimony simultaneously.

[0006] To solve the above-mentioned technical problems, the present invention provides a wastewater treatment method containing iron, arsenic and antimony, comprising the following steps: S1, sequentially subjecting the wastewater containing iron, arsenic and antimony to coarse filtration and ultrafiltration;

[0007] S2. The filtered wastewater is then subjected to reverse osmosis concentration treatment to obtain a concentrated solution containing iron, arsenic and antimony.

[0008] S3. Add pyrite to the obtained iron-arsenic-antimony enriched solution, stir and heat to obtain a reducing solution, and evaporate and crystallize the reducing solution, then separate the solid and liquid to obtain crude ferrous sulfate and crystallization mother liquor.

[0009] S4. Add deionized water to crude ferrous sulfate, stir to dissolve, filter, and obtain ferrous sulfate solution and arsenic-containing insoluble matter.

[0010] S5. Add an adsorbent to the obtained ferrous sulfate solution and react in a shaker to obtain a purified ferrous sulfate solution and an arsenic-antimony-containing adsorbent. Then, cool and crystallize the purified ferrous sulfate solution to obtain ferrous sulfate heptahydrate.

[0011] S6. The desorbent is reacted with the obtained arsenic-antimony-containing adsorbent, and the adsorbent is washed with ultrapure water to obtain the regenerated adsorbent and the primary antimony-arsenic enrichment solution.

[0012] S7. Mix the crystallization mother liquor obtained in S3 and the arsenic-containing insoluble matter obtained in S4, add a preset amount of hydrogen peroxide for oxidation leaching to obtain an oxidation leaching solution, then add a regenerating adsorbent to the oxidation leaching solution and repeat the operation of S6 to obtain a regenerating adsorbent and a secondary antimony-arsenic enrichment solution.

[0013] S8. Mix the primary and secondary antimony-arsenic enrichment solutions, add sulfur dioxide, evaporate and crystallize to obtain arsenic trioxide and antimony solution.

[0014] Preferably, the adsorbent in step S5 is an electrolytic manganese slag-distillers' grains biochar composite.

[0015] Preferably, the preparation method of the adsorbent specifically includes the following steps:

[0016] S51. Place the distiller's grains and electrolytic manganese residue in an oven to dry;

[0017] S52. Crush and sieve the dried electrolytic manganese slag;

[0018] S53. Mix the distiller's grains and electrolytic manganese residue in a certain proportion, moisten with deionized water, stir until uniform and dry.

[0019] S54. The mixture prepared in S53 is pyrolyzed, ground, and sieved to obtain an adsorbent electrolytic manganese slag-distillers' grains biochar composite.

[0020] Preferably, the desorbent in step S6 is a sodium hydroxide solution.

[0021] The present invention also provides a device for treating wastewater containing iron, arsenic, and antimony, used in the aforementioned wastewater treatment method for wastewater containing iron, arsenic, and antimony, comprising:

[0022] The mounting cylinder has a liquid outlet pipe connected to its bottom and a material outlet pipe connected to its side bottom. Both the liquid outlet pipe and the material outlet pipe are equipped with valves.

[0023] The liquid inlet pipe is rotatably connected to the top of the mounting cylinder, the bottom end of the liquid inlet pipe is sealed, and the liquid inlet pipe has a water inlet hole.

[0024] The liquid guiding structure includes a main pipe and a liquid guiding box. The main pipe is installed on the top of the inner wall of the mounting cylinder, and the liquid guiding box is installed on the side of the main pipe. The upper and lower ends of the liquid guiding box are connected to the main pipe through a first backflush hole and a second backflush hole, respectively. A water outlet hole is opened on the main pipe at a preset angle with the liquid guiding box, and the water outlet hole is flush with the height of the first backflush hole.

[0025] The bottom end of the inlet pipe is inserted into the main pipe, and the inlet hole is aligned with the outlet hole;

[0026] A filter cartridge is installed inside the mounting cylinder. The connecting pipe at the top of the filter cartridge is inserted into the bottom of the main pipe. The connecting pipe has a liquid inlet, which is aligned with the second backflush hole.

[0027] A driving device for driving the inlet pipe to rotate.

[0028] Preferably, a rotary connector is installed at the top end of the inlet pipe.

[0029] Preferably, there are two liquid guide boxes and two water outlet holes, the liquid guide boxes and the water outlet holes are set at a 90-degree angle, and two water inlet holes are symmetrically opened on the liquid inlet pipe.

[0030] Preferably, the wastewater treatment equipment containing iron, arsenic, and antimony includes a mounting frame, which is mounted on the mounting cylinder.

[0031] Preferably, the drive device includes a bracket, a motor, a main gear, and a driven gear. The motor is mounted on the mounting bracket via the bracket, the main gear is mounted on the output shaft of the motor, and the driven gear is mounted on the inlet pipe. The main gear meshes with the driven gear.

[0032] Preferably, a centrifugal ring is installed at the bottom of the filter cartridge, the centrifugal ring is attached to the bottom of the inner wall of the mounting cylinder, a push plate is installed at the top of the centrifugal ring, a driven sleeve is installed on the inner wall of the connecting pipe, and a driving block is installed at the bottom of the liquid inlet pipe, the driving block and the driven sleeve are located at the same height plane.

[0033] Compared with related technologies, the wastewater treatment method and equipment containing iron, arsenic, and antimony provided by this invention have the following beneficial effects:

[0034] This invention provides a wastewater treatment method containing iron, arsenic, and antimony, which can repair water bodies polluted by iron, arsenic, and antimony, and at the same time achieve the harmless treatment and resource utilization of solid waste (distillers' grains, electrolytic manganese slag, etc.), thus achieving the goal of treating pollution with waste.

[0035] The adsorbent of this invention adopts a one-step pyrolysis method, which is simple, requires no chemical reagents, is environmentally friendly, and can be recycled and reused. The adsorbent has a large specific surface area and total pore volume. Attached Figure Description

[0036] Figure 1 A flowchart illustrating the steps of the wastewater treatment method containing iron, arsenic, and antimony provided by the present invention;

[0037] Figure 2 A flowchart of the preparation steps of the adsorbent provided by the present invention.

[0038] Figure 3 A schematic diagram of the structure of the wastewater treatment equipment containing iron, arsenic, and antimony provided by the present invention;

[0039] Figure 4 A partial cross-sectional view of the wastewater treatment equipment containing iron, arsenic, and antimony provided by the present invention;

[0040] Figure 5 for Figure 4 The enlarged schematic diagram of part A shown below;

[0041] Figure 6 for Figure 3 A schematic diagram of the structure of a wastewater treatment device containing iron, arsenic, and antimony from another perspective;

[0042] Figure 7 A schematic diagram of the liquid guiding structure provided by the present invention;

[0043] Figure 8 This is a schematic diagram illustrating the working state of the wastewater treatment equipment containing iron, arsenic, and antimony provided by the present invention, wherein... Figure 8 Image (a) is a schematic diagram of the filter cartridge in the filtration state. Figure 8 (b) is a schematic diagram of the filter cartridge in a clean state;

[0044] Figure 9 This is a schematic diagram showing the state in which the water inlet and outlet or the first backflush hole are connected, as provided by the present invention. Figure 9 (a) is a schematic diagram showing the state where the inlet and outlet are connected. Figure 9 (b) is a schematic diagram showing the state in which the water inlet hole is connected to the first backflush hole;

[0045] Figure 10 This is a schematic diagram illustrating the state in which the centrifugal ring rotates to generate centrifugal force, causing impurities to enter the discharge pipe, as provided by the present invention.

[0046] Numbering on the map:

[0047] 1. Install the cylinder;

[0048] 2. Liquid inlet pipe; 21. Water inlet hole; 22. Drive block;

[0049] 3. Discharge pipe; 31. Valve;

[0050] 4. Discharge pipe;

[0051] 5. Filter cartridge; 51. Connecting pipe; 52. Driven sleeve; 53. Centrifugal ring;

[0052] 511. Liquid inlet; 531. Push plate;

[0053] 6. Drive unit; 61. Bracket; 62. Motor; 63. Main gear; 64. Driven gear;

[0054] 7. Liquid guiding structure; 71. Main pipe; 72. Liquid guiding box; 711. Water outlet; 712. First backflush hole; 713. Second backflush hole;

[0055] 8. Rotary connector;

[0056] 9. Mounting bracket. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0058] This invention provides a method for treating wastewater containing iron, arsenic, and antimony.

[0059] Please refer to the following: Figures 1 to 5 In one embodiment of the present invention, the wastewater treatment method containing iron, arsenic and antimony includes the following steps: S1, sequentially subjecting the wastewater containing iron, arsenic and antimony to coarse filtration and ultrafiltration;

[0060] S2. The filtered wastewater is then subjected to reverse osmosis concentration treatment to obtain a concentrated solution containing iron, arsenic and antimony.

[0061] S3. Add pyrite to the obtained iron-arsenic-antimony enriched solution, stir and heat to obtain a reducing solution, and evaporate and crystallize the reducing solution, then separate the solid and liquid to obtain crude ferrous sulfate and crystallization mother liquor.

[0062] S4. Add deionized water to crude ferrous sulfate, stir to dissolve, filter, and obtain ferrous sulfate solution and arsenic-containing insoluble matter.

[0063] S5. Add an adsorbent to the obtained ferrous sulfate solution and react in a shaker to obtain a purified ferrous sulfate solution and an arsenic-antimony-containing adsorbent. Then, cool and crystallize the purified ferrous sulfate solution to obtain ferrous sulfate heptahydrate.

[0064] S6. The desorbent is reacted with the obtained arsenic-antimony-containing adsorbent, and the adsorbent is washed with ultrapure water to obtain the regenerated adsorbent and the primary antimony-arsenic enrichment solution.

[0065] S7. Mix the crystallization mother liquor obtained in S3 and the arsenic-containing insoluble matter obtained in S4, add a preset amount of hydrogen peroxide for oxidation leaching to obtain an oxidation leaching solution, then add a regenerating adsorbent to the oxidation leaching solution and repeat the operation of S7 to obtain a regenerating adsorbent and a secondary antimony-arsenic enrichment solution.

[0066] S8. Mix the primary and secondary antimony-arsenic enrichment solutions, add sulfur dioxide, evaporate and crystallize to obtain arsenic trioxide and antimony solution.

[0067] The method of this invention can repair water bodies polluted by iron, arsenic and antimony, and at the same time achieve the harmless treatment and resource utilization of solid waste (distillers' grains, electrolytic manganese slag, etc.), thus achieving the goal of treating pollution with waste.

[0068] The adsorbent of this invention adopts a one-step pyrolysis method, which is simple, requires no chemical reagents, is environmentally friendly, and can be recycled and reused. The adsorbent has a large specific surface area and total pore volume.

[0069] In step S1, the wastewater is coarsely filtered to remove large suspended solids, floating matter and other impurities, protecting subsequent precision treatment units such as ultrafiltration and reverse osmosis, and preventing subsequent membrane element clogging and damage.

[0070] Before entering the ultrafiltration stage, flocculants (such as PAC) and coagulants (such as PAM) can be added to the wastewater after coarse filtration to allow fine colloids and impurities to aggregate into flocs, which are then separated by sedimentation in a sedimentation tank. Finally, the wastewater is filtered out by a security filter (with a filtration accuracy of 5μm) to remove residual fine particles, ensuring that the wastewater entering the ultrafiltration system is free of large particulate impurities.

[0071] The adsorbent in step S5 is an electrolytic manganese slag-distillers' grains biochar composite.

[0072] Metal oxides from electrolytic manganese slag are loaded onto biochar via co-pyrolysis, altering the physicochemical properties of the biochar, increasing the content of functional groups on the biochar surface, providing more adsorption sites, and improving its adsorption capacity.

[0073] The adsorbent contains chemical bonds such as -OH, CO, CO, and CC, as well as active oxygen species. Its effects on As(III,V) and Sb(III,V) include complexation, hydrogen bonding, and pore filling. Moreover, it reduces the environmental toxicity of Sb and As by oxidizing As(III) and Sb(III) to As(V) and Sb(V).

[0074] The preparation method of the adsorbent specifically includes the following steps:

[0075] S51. Place the distiller's grains and electrolytic manganese residue in an oven to dry;

[0076] S52. Crush and sieve the dried electrolytic manganese slag;

[0077] S53. Mix the distiller's grains and electrolytic manganese residue in a certain proportion, moisten with deionized water, stir until uniform and dry.

[0078] S54. The mixture prepared in S53 is pyrolyzed, ground, and sieved to obtain an adsorbent electrolytic manganese slag-distillers' grains biochar composite.

[0079] The desorbent in step S6 is a sodium hydroxide solution.

[0080] The preparation of the adsorbent electrolytic manganese slag-distillers' grains biochar composite specifically includes the following steps:

[0081] Step 1: Place the distiller's grains and electrolytic manganese slag in an oven to dry;

[0082] Step 2: Crush the electrolytic manganese slag obtained in Step 1 and pass it through a 200-mesh sieve;

[0083] Step 3: Mix the distiller's grains and electrolytic manganese slag at a mass ratio of 1:3, moisten with deionized water, stir until uniform, and dry at 80℃;

[0084] Step 4: The mixture prepared in Step 3 is pyrolyzed at 750℃ under a stable nitrogen flow at 2.5℃ / min for 30 min, then ground and sieved to obtain the adsorbent electrolytic manganese slag-distillers' grains biochar composite.

[0085] The wastewater treatment method containing iron, arsenic, and antimony specifically includes the following steps:

[0086] Step 1: Perform coarse filtration and ultrafiltration on the iron, arsenic, and antimony-containing wastewater.

[0087] Step 2: The filtered wastewater is then concentrated by reverse osmosis to remove macromolecules, colloids, and suspended particles, resulting in an iron, arsenic, and antimony enriched solution.

[0088] Step 3: Add 100g of pyrite with a particle size of -74µm > 95% to the iron-arsenic-antimony enriched solution obtained in Step 2, stir and heat at 80℃ to obtain a reducing solution; evaporate and crystallize the reducing solution, separate the solid and liquid to obtain crude ferrous sulfate and crystallization mother liquor; the pyrite is obtained from solid wastes such as coal gangue, sulfuric acid slag, and tailings;

[0089] Step 4: Add deionized water to the crude ferrous sulfate and stir to dissolve at 25°C. Filter to obtain ferrous sulfate solution and arsenic-containing insoluble matter.

[0090] Step 5: Add 0.1g of adsorbent electrolytic manganese slag-distillers' grains biochar composite to the obtained ferrous sulfate solution, and react in a shaker at 25℃ with a shaking speed of 250rpm to obtain a purified ferrous sulfate solution and an arsenic-antimony adsorbent; then cool and crystallize the purified ferrous sulfate solution, filter it, and obtain ferrous sulfate heptahydrate.

[0091] Step 6: React 0.1M sodium hydroxide solution (the desorbent) with the arsenic-antimony adsorbent obtained in Step 9 for 3 hours. Wash the adsorbent with ultrapure water to obtain the regenerated adsorbent and the primary antimony-arsenic enrichment solution.

[0092] Step 7: Mix the crystallization mother liquor obtained in Step 3 and the arsenic-containing insoluble matter obtained in Step 4, add an appropriate amount of hydrogen peroxide for oxidation leaching, and obtain an oxidation leaching solution; add the regenerated adsorbent obtained in Step 6 to the oxidation leaching solution, and perform the same operation as in Step 6 to obtain the regenerated adsorbent and the secondary antimony-arsenic enrichment solution.

[0093] Step 8: Mix the primary and secondary antimony-arsenic enrichment solutions, add sulfur dioxide at a flow rate of 1 L / min, react at 40 °C for 2 h, evaporate and crystallize, filter to obtain arsenic trioxide and antimony solution.

[0094] The present invention also provides a device for treating wastewater containing iron, arsenic and antimony.

[0095] Please see Figures 3 to 5 A wastewater treatment device for iron, arsenic, and antimony, used in the aforementioned wastewater treatment method for iron, arsenic, and antimony, comprising:

[0096] The bottom of the mounting cylinder 1 is connected to the liquid outlet pipe 3, and the bottom side of the mounting cylinder 1 is connected to the material outlet pipe 4. Both the liquid outlet pipe 3 and the material outlet pipe 4 are equipped with valves 31.

[0097] Liquid inlet pipe 2, which is rotatably connected to the top of the mounting cylinder 5, has a sealed bottom end and a water inlet hole 21.

[0098] The liquid guiding structure 7 includes a main pipe 71 and a liquid guiding box 72. The main pipe 71 is installed on the top of the inner wall of the mounting cylinder 1, and the liquid guiding box 72 is installed on the side of the main pipe 71. The upper and lower ends of the liquid guiding box 72 are connected to the main pipe 71 through a first backflush hole 712 and a second backflush hole 713, respectively. A water outlet hole 711 is provided on the main pipe 71 at a preset angle to the liquid guiding box 72. The water outlet hole 711 is flush with the height of the first backflush hole 712.

[0099] The bottom end of the liquid inlet pipe 2 is inserted into the main pipe 71, and the water inlet hole 21 is aligned with the water outlet hole 711;

[0100] The filter cartridge 5 is installed inside the mounting cylinder 1. The connecting pipe 51 at the top of the filter cartridge 51 is inserted into the bottom of the main pipe 71. The connecting pipe 51 has a liquid inlet 511, which is aligned with the second backflush hole 713.

[0101] The driving device 6 is used to drive the inlet pipe 2 to rotate.

[0102] This equipment is mainly used for coarse filtration of wastewater in step S1;

[0103] During filtration, such as Figure 8 In step (a), wastewater is added through the inlet pipe 2. The wastewater is drained into the interior of the mounting cylinder 1 through the inlet hole 21 and the outlet hole 711. After being filtered by the filter cylinder 5, the wastewater is discharged to the next treatment stage through the outlet pipe 3. The filter cylinder 5 filters out large impurities on the outside of the filter cylinder 5.

[0104] During filtration, the filtered impurities can be discharged periodically. To discharge them, open valve 31 on the discharge pipe 4 to allow the concentrated liquid containing impurities to be discharged through the discharge pipe 4. Alternatively, clean water can be added through the inlet pipe 2 to remove the impurities, which will then be discharged through the discharge pipe 4.

[0105] When filtering is complete, such as Figure 8 In step (b), when cleaning the filter cartridge 5, the inlet pipe 2 is rotated by the drive device 6 to rotate by a preset angle so that the water inlet hole 21 is aligned with the first backflush hole 712 in the liquid guiding structure 7. At this time, the water inlet hole 21 and the water outlet hole 711 are offset. When clean water is added through the inlet pipe 2, the clean water enters the liquid guiding box 72 through the water inlet hole 21 and the first backflush hole 712, and then enters the connecting pipe 51 through the second backflush hole 713 and the liquid inlet 511. After entering the interior of the filter cartridge 5 through the connecting pipe 51, the clean water overflows from the interior of the filter cartridge 5 to the outside into the mounting cylinder 1. The clean water carries away the impurities attached to the outside of the filter cartridge 5, thus cleaning the filter cartridge 5. The cleaned liquid carries away the impurities and is discharged through the discharge pipe 4.

[0106] Thus, by setting up the liquid guiding structure 7 in conjunction with the rotating liquid inlet pipe 2, the filter cartridge 5 can be adjusted to achieve the filtration function or be in a clean state. There is no need to set up a separate cleaning system for cleaning the filter cartridge 5, or to frequently disassemble the installation cylinder 1 to remove the filter cartridge 5 for cleaning.

[0107] The inlet pipe 2 is connected to the outlet of the water pump via a pipe. The inlet of the water pump is connected to a three-way pipe. One end of the three-way pipe is connected to the wastewater storage container via a valve and a pipe, and the other end is connected to the cleaning liquid storage container via a valve and a pipe, which is used to clean the filter cartridge 5.

[0108] The valve 31 of the outlet pipe 3 connects to the pipeline to transport the treated waste liquid to the next process.

[0109] The discharge pipe 4 discharges the concentrated liquid and impurities into the collection container.

[0110] Please see Figure 3 The top of the mounting cylinder 1 extends upward and is provided with a mounting tube that is sleeved on the outside of the liquid inlet pipe 2 to protect the liquid inlet pipe 2. The liquid inlet pipe 2 is rotatably connected to the mounting tube, and a sealing ring is provided on the inner wall of the mounting tube to ensure sealing.

[0111] Please see Figure 3 As a preferred embodiment, a rotary connector 8 is installed at the top end of the liquid inlet pipe 2.

[0112] By setting a rotary connector 8, which is connected to the outlet end of the water pump through a pipe, when the drive device 6 needs to drive the inlet pipe 2 to rotate by a preset angle, the pipe will not be driven to rotate by the preset angle, thus improving the stability of the pipe.

[0113] Please refer to the figure. There are two liquid guide boxes 72 and two water outlet holes 711. The liquid guide boxes 72 and the water outlet holes 711 are set at a 90-degree angle. Two water inlet holes 21 are symmetrically opened on the liquid inlet pipe 2.

[0114] Each liquid guide box 72 corresponds to a first backflush hole 712 and a second backflush hole 713, such as Figure 7 The two liquid guide boxes 72 each have two first backflush holes 712 and two second backflush holes 713, and two liquid inlets 511 are symmetrically opened on the corresponding connecting pipes 51.

[0115] By providing two of each of the water outlet 711, water inlet 21, liquid inlet 511, first backflush hole 712, and second backflush hole 713, the water intake volume is further guaranteed.

[0116] When the inlet hole 21 is aligned with the outlet hole 711 or the first backflush hole 712, the drive device 6 drives the inlet pipe 2 to rotate 90 degrees.

[0117] Please see Figure 3 In this embodiment, the wastewater treatment equipment containing iron, arsenic, and antimony preferably includes a mounting frame 9, which is mounted on the mounting cylinder 1.

[0118] Mounting bracket 9 is used to install the equipment in the corresponding position. During installation, bolts and nuts are used to install the equipment through the mounting holes on mounting bracket 9. Assembly holes are provided on the corresponding mounting surfaces.

[0119] Please see Figure 6In this embodiment, the driving device 6 includes a bracket 61, a motor 62, a main gear 63, and a driven gear 64. The motor 62 is mounted on the mounting bracket 9 via the bracket 61. The main gear 63 is mounted on the output shaft of the motor 62. The driven gear 64 is mounted on the inlet pipe 2. The main gear 63 meshes with the driven gear 64.

[0120] When it is necessary to drive the inlet pipe 2 to rotate, the motor 62 drives the main gear 63 to rotate, and the main gear 63 drives the inlet pipe 2 to rotate through the slave gear 64, thereby realizing the function of driving the inlet pipe 2 to rotate.

[0121] Please see Figure 4 As a preferred embodiment, a centrifugal ring 53 is installed at the bottom of the filter cartridge 5, the centrifugal ring 53 is attached to the bottom of the inner wall of the mounting cylinder 1, a push plate 531 is installed at the top of the centrifugal ring 53, a driven sleeve 52 is installed on the inner wall of the connecting pipe 51, and a driving block 22 is installed at the bottom of the liquid inlet pipe 2, the driving block 22 and the driven sleeve 52 are located at the same height plane.

[0122] When the drive device 6 drives the inlet pipe 2 to rotate 90 degrees, so that the water inlet hole 21 switches from being aligned with the water outlet hole 711 to being aligned with the first backflushing hole 712, the drive block 22 abuts against the driven sleeve 52. Subsequently, when it is necessary to remove the filtered impurities after cleaning, the drive device 6 continues to drive the inlet pipe 2 to rotate an integer number of revolutions. The inlet pipe 2 pushes the driven sleeve 52 through the drive block 22, causing the connecting pipe 51 to rotate accordingly. The connecting pipe 51 drives the filter cylinder 5 to rotate accordingly. The filter cylinder 5 drives the centrifugal ring 53 at the bottom to rotate accordingly. The rotation of the centrifugal ring 53 generates centrifugal force, causing the impurities that fall on the centrifugal ring 53 to enter the discharge pipe 4 and be discharged. The push plate 531 can assist in pushing the impurities, so that the impurities can all pass through the inlet of the discharge pipe 4 and enter the discharge pipe 4 and be discharged by centrifugal force.

[0123] Cleaning fluid can be added to the mounting cylinder 1 through the inlet pipe 2 to carry out the remaining impurities in the outlet pipe 4 to the preset collection container.

[0124] Thus, when the filter cartridge 5 is switched from the filtration state to the cleaning state, the driven block 22 abuts against the driven sleeve 52, which can then drive the centrifugal ring 53 to rotate and generate centrifugal force, making it easier to discharge the impurities that fall on the centrifugal ring 53.

[0125] Since the driving device 6 drives the inlet pipe 2 to rotate an integer number of revolutions, the state of the inlet pipe 2 when it stops is the same as the state at the beginning. At this time, the water inlet hole 21 is still aligned with the first backflush hole 712. After rotating it 90 degrees in the opposite direction, the water inlet hole 21 can be aligned with the water outlet hole 711 again to perform filtration.

[0126] Preferably, a plug is provided on one side of the driving block 22. When the driving block 22 rotates to abut against the driven sleeve 52, the plug is inserted into the driven sleeve 52 to achieve plug-in connection, thereby improving the stability of the connection.

[0127] The plug is arc-shaped, and the inner cavity of the corresponding driven sleeve 52 is also arc-shaped, so that when the driven block 22 rotates 90 degrees and comes into contact with the driven sleeve 52, the plug can be smoothly inserted into the arc-shaped cavity.

[0128] The working principle of the wastewater treatment method and equipment containing iron, arsenic, and antimony provided by this invention is as follows:

[0129] During filtration, such as Figure 8 In step (a), wastewater is added through the inlet pipe 2. The wastewater is drained into the interior of the mounting cylinder 1 through the inlet hole 21 and the outlet hole 711. After being filtered by the filter cylinder 5, the wastewater is discharged to the next treatment stage through the outlet pipe 3. The filter cylinder 5 filters out large impurities on the outside of the filter cylinder 5.

[0130] During filtration, the filtered impurities can be discharged periodically. To discharge them, open valve 31 on the discharge pipe 4 to allow the concentrated liquid containing impurities to be discharged through the discharge pipe 4. Alternatively, clean water can be added through the inlet pipe 2 to remove the impurities, which will then be discharged through the discharge pipe 4.

[0131] When filtering is complete, such as Figure 8 In step (b), when cleaning the filter cartridge 5, the inlet pipe 2 is rotated by the drive device 6 to rotate by a preset angle so that the water inlet hole 21 is aligned with the first backflush hole 712 in the liquid guiding structure 7. At this time, the water inlet hole 21 and the water outlet hole 711 are misaligned. When clean water is added through the inlet pipe 2, the clean water enters the liquid guiding box 72 through the water inlet hole 21 and the first backflush hole 712, and then enters the connecting pipe 51 through the second backflush hole 713 and the liquid inlet 511. After entering the interior of the filter cartridge 5 through the connecting pipe 51, the clean water overflows from the interior of the filter cartridge 5 to the outside into the mounting cylinder 1. The clean water carries away the impurities attached to the outside of the filter cartridge 5, thus cleaning the filter cartridge 5. The cleaned liquid carries away the impurities and is discharged through the discharge pipe 4.

[0132] Thus, by setting up the liquid guiding structure 7 in conjunction with the rotating liquid inlet pipe 2, the filter cartridge 5 can be adjusted to achieve the filtration function or be in a clean state. There is no need to set up a separate cleaning system for cleaning the filter cartridge 5, or to frequently disassemble the installation cylinder 1 to remove the filter cartridge 5 for cleaning.

[0133] Furthermore, when the driving device 6 drives the inlet pipe 2 to rotate 90 degrees, so that the water inlet hole 21 switches from being aligned with the water outlet hole 711 to being aligned with the first backflushing hole 712, the driving block 22 abuts against the driven sleeve 52. Subsequently, when it is necessary to remove the filtered impurities after cleaning, the driving device 6 continues to drive the inlet pipe 2 to rotate an integer number of times. The inlet pipe 2 pushes the driven sleeve 52 through the driving block 22, causing the connecting pipe 51 to rotate accordingly. The connecting pipe 51 drives the filter cylinder 5 to rotate accordingly. The filter cylinder 5 drives the centrifugal ring 53 at the bottom to rotate accordingly. The rotation of the centrifugal ring 53 generates centrifugal force, causing the impurities that fall on the centrifugal ring 53 to enter the discharge pipe 4 and be discharged. The push plate 531 can assist in pushing the impurities, so that the impurities can all pass through the inlet of the discharge pipe 4 and enter the discharge pipe 4 and be discharged by centrifugal force.

[0134] Cleaning fluid can be added to the mounting cylinder 1 through the inlet pipe 2 to carry out the remaining impurities in the outlet pipe 4 to the preset collection container.

[0135] Thus, when the filter cartridge 5 is switched from the filtration state to the cleaning state, the driven block 22 abuts against the driven sleeve 52, which can then drive the centrifugal ring 53 to rotate and generate centrifugal force, making it easier to discharge the impurities that fall on the centrifugal ring 53.

[0136] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for treating wastewater containing iron, arsenic, antimony, characterized in that, Includes the following steps: S1. The wastewater containing iron, arsenic and antimony is subjected to coarse filtration and ultrafiltration in sequence; S2. The filtered wastewater is then subjected to reverse osmosis concentration treatment to obtain a concentrated solution containing iron, arsenic and antimony. S3. Add pyrite to the obtained iron-arsenic-antimony enriched solution, stir and heat to obtain a reducing solution, and evaporate and crystallize the reducing solution, then separate the solid and liquid to obtain crude ferrous sulfate and crystallization mother liquor. S4. Add deionized water to crude ferrous sulfate, stir to dissolve, filter, and obtain ferrous sulfate solution and arsenic-containing insoluble matter. S5. Add an adsorbent to the obtained ferrous sulfate solution and react in a shaker to obtain a purified ferrous sulfate solution and an arsenic-antimony-containing adsorbent. Then, cool and crystallize the purified ferrous sulfate solution to obtain ferrous sulfate heptahydrate. S6. The desorbent is reacted with the obtained arsenic-antimony-containing adsorbent, and the adsorbent is washed with ultrapure water to obtain the regenerated adsorbent and the primary antimony-arsenic enrichment solution. S7. Mix the crystallization mother liquor obtained in S3 and the arsenic-containing insoluble matter obtained in S4, add a preset amount of hydrogen peroxide for oxidation leaching to obtain an oxidation leaching solution, then add a regenerating adsorbent to the oxidation leaching solution and repeat the operation of S6 to obtain a regenerating adsorbent and a secondary antimony-arsenic enrichment solution. S8. Mix the primary and secondary antimony-arsenic enrichment solutions, add sulfur dioxide, evaporate and crystallize to obtain arsenic trioxide and antimony solution.

2. The method for treating wastewater containing iron, arsenic, antimony according to claim 1, characterized by, The adsorbent in step S5 is an electrolytic manganese slag-distillers' grains biochar composite.

3. The wastewater treatment method containing iron, arsenic, and antimony according to claim 2, characterized in that, The preparation method of the adsorbent specifically includes the following steps: S51. Place the distiller's grains and electrolytic manganese residue in an oven to dry; S52. Crush and sieve the dried electrolytic manganese slag; S53. Mix the distiller's grains and electrolytic manganese residue in a certain proportion, moisten with deionized water, stir until uniform and dry. S54. The mixture prepared in S53 is pyrolyzed, ground, and sieved to obtain an adsorbent electrolytic manganese slag-distillers' grains biochar composite.

4. The wastewater treatment method containing iron, arsenic, and antimony according to claim 1, characterized in that, The desorbent in step S6 is a sodium hydroxide solution.

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