An acid mine drainage treatment system based on microbial treatment

Abstract

The application provides an acid mine wastewater treatment system based on microbial treatment, comprising a regulating pool, an aeration pool, a neutralization pool and a dissolution pool arranged in sequence; wherein the aeration pool is internally provided with a bacteria liquid adding device, an aeration stirring device and two sets of collecting devices, the aeration stirring device is arranged between the two sets of collecting devices, and the aeration stirring device can improve the oxygen content of wastewater and force the precipitate to be collected in the collecting devices. The collecting device comprises a guide rod group fixed to the bottom of the aeration pool, a movable plate frame slidably connected to the guide rod group and a hoisting mechanism for forcing the movable plate frame to move up and down, the bottom of the movable plate frame is detachably provided with a gauze bag for collecting the precipitate; in the initial state, the movable plate frame and the gauze bag are located at the bottom of the aeration pool, and the movable plate frame and the gauze bag can be moved to above the aeration pool by controlling the action of the hoisting mechanism. Therefore, the precipitate can be conveniently collected and treated above the aeration pool, and the work efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to an acid mine drainage treatment system based on microbial treatment. BACKGROUND

[0002] Acid mine drainage (AMD) is a kind of wastewater with strong acidity (pH 2.0-3.5), rich in Fe, SO4 2- and various heavy metal ions (Cu, As, etc.), which is formed in the process of exploitation and utilization of coal mines and various metal mines, and effective treatment of the AMD has become one of the key problems in the comprehensive management of the ecological environment of mining areas.

[0003] At present, the treatment methods of the AMD include neutralization method, sulfide precipitation flotation method, sulfate-reducing bacteria method, etc. Since lime is widely available and low in price, the lime neutralization is still the most commonly used method for treating the AMD in the world, and the engineering utilization rate reaches more than 90%. However, the Fe 2+ in the AMD cannot be completely oxidized in the range of pH 7 by using lime to neutralize the acid mine drainage, and thus it is difficult to be completely hydrolyzed, precipitated and removed.

[0004] The related art discloses an acid mine drainage treatment system, before the AMD is treated by using the neutralization method to adjust the pH value, the wastewater is introduced into an aeration tank, with the help of acidophilic ferrous-oxidizing bacteria (A. ferrooxidans) and through stirring the wastewater, the wastewater can be fully contacted with the acidophilic ferrooxidans, so that the Fe 2+ is rapidly oxidized to obtain Fe 3+ . The oxidation of the acidophilic ferrous-oxidizing bacteria to Fe 2+ Fe 3+ is often accompanied by the synthesis of secondary iron minerals such as pyrite and schuilingite, compared with the hydroxide of iron obtained by the lime neutralization method, the secondary iron minerals such as schuilingite and pyrite have good sedimentation performance and are easy to precipitate, which is more beneficial to the precipitation and removal of the Fe element.

[0005] After the acidophilic ferrous-oxidizing bacteria is added into the aeration tank and stirred by aeration, the reaction needs to be performed for 40-72 hours, so that the precipitate generated in the wastewater is fully precipitated. However, the aeration tank constructed in the treatment of the mining wastewater has a large depth, since the precipitate is usually deposited at the bottom of the aeration tank, when the precipitate is collected and treated subsequently, the worker needs to enter the bottom of the aeration tank to clean and recycle the precipitate after the wastewater in the aeration tank is drained, which is inconvenient and time-consuming and labor-consuming. SUMMARY

[0006] Based on this, the application provides a kind of acid mine wastewater treatment system based on microbial treatment, for after wastewater is treated by microorganism, precipitate is generated after aeration stirring, can conveniently collect and process precipitate.

[0007] The acid mine wastewater treatment system based on microbial treatment provided by the application adopts the following technical scheme:

[0008] The acid mine wastewater treatment system based on microbial treatment comprises a regulating tank for adjusting the pH value of wastewater, an aeration tank for precipitating Fe elements, a neutralization tank for neutralizing precipitated wastewater and a dissolving tank for dissolving lime; the regulating tank, the aeration tank, the neutralization tank and the dissolving tank are connected in sequence, a conveying pipeline for conveying wastewater is connected to the front end of the regulating tank, and a discharge pipeline for discharging wastewater is connected to the rear end of the dissolving tank.

[0009] The aeration tank is provided with a bacterial liquid adding device, an aeration stirring device and two sets of collecting devices, the two sets of collecting devices are arranged on two opposite inner side walls of the aeration tank, and the aeration stirring device is arranged between the two sets of collecting devices, so that the oxygen content of the wastewater can be increased while forcing the precipitate to be collected in the collecting devices.

[0010] The collecting device comprises a guide rod group fixed vertically on the bottom of the aeration tank, a movable plate frame slidably connected to the guide rod group and a hoisting mechanism for forcing the movable plate frame to rise and fall, the top surface of the movable plate frame is provided with a through falling material chute, and a mesh bag for collecting precipitate is detachably installed at the bottom of the movable plate frame; in the initial state, the movable plate frame and the mesh bag are located on the bottom of the aeration tank, and the movable plate frame and the mesh bag can be moved to above the aeration tank by controlling the action of the hoisting mechanism.

[0011] By adopting the above technical scheme, the application can effectively reduce the metal ions in the wastewater after the AMD wastewater passes through the regulating tank, the aeration tank, the neutralization tank and the dissolving tank in sequence, and neutralize the wastewater in the pH value range of 7 to achieve the discharge standard of the wastewater. When the wastewater passes through the aeration tank, the appropriate microbial bacterial liquid containing acidophilic iron-oxidizing bacteria is added into the aeration tank through the bacterial liquid adding device, the oxygen content in the wastewater is increased and the wastewater is stirred at the same time through the aeration stirring device, and the pH value and the wastewater temperature are adjusted in the appropriate range, so that Fe 2+ Oxidation generates large particle precipitates such as pyrite and schulteite, which is beneficial to the precipitation and removal of Fe elements.

[0012] The precipitate generated by the reaction is deposited on the bottom of the aeration tank, and the movable plate frame and the mesh bag are arranged in the initial state and during the precipitation of Fe element, so that the movable plate frame and the mesh bag are kept on the bottom of the aeration tank, and the agitation of the aeration stirring device can make the precipitate fall into the two mesh bags on the two sides. After the reaction is completed and the wastewater is discharged, the movable plate frame and the mesh bag are moved to the top of the aeration tank along the guide rod group by controlling the lifting mechanism, and the mesh bag can be removed and replaced by the operator above the aeration tank, so that the precipitate in the mesh bag can be conveniently collected and treated, the operation efficiency is improved, and the workload and labor intensity of the operator are greatly reduced.

[0013] Optionally, the bottom of the movable plate frame is provided with two sliding grooves, and the two sliding grooves are located on the two sides of the material falling groove; a plurality of hooking pieces are slidably installed in each sliding groove, and the open edge of the mesh bag is provided with a plurality of grommets which are hooked and matched with the hooking pieces.

[0014] A linkage mechanism is arranged between every two adjacent hooking pieces in the same sliding groove for connecting the hooking pieces with each other; the two hooking pieces closest to the inner wall of the sliding groove are respectively arranged as a first hooking piece and a second hooking piece, the first hooking piece is fixedly connected to the sliding groove, and the second hooking piece is connected with a folding mechanism, and the hooking pieces can be folded by controlling the folding mechanism.

[0015] By adopting the above technical scheme, the mesh bag can be detachably installed on the bottom of the movable plate frame by the cooperation of the plurality of grommets and the plurality of hooking pieces, and has the advantages of convenient installation and convenient disassembly. In addition, when collecting and treating the precipitate, the second hooking piece can be driven to move towards the first hooking piece by controlling the folding mechanism, so as to force the hooking pieces to be folded. The operator can hook and fix all the grommets one by one on the corresponding grommets on the top of the corner position of the aeration tank, which is more convenient for overall operation, further improves the operation efficiency, and greatly reduces the workload and labor intensity of the operator.

[0016] Optionally, the folding mechanism comprises a fixed seat, a guide frame and a first steel wire, the fixed seat is arranged on the top of the aeration tank, and the guide frame is fixed to the inner wall of the aeration tank close to the first hooking piece; one end of the first steel wire is connected to the fixed seat, and the other end passes under the guide frame and is connected with the second hooking piece. When the movable plate frame moves upward, the first steel wire pulls the second hooking piece to move towards the first hooking piece.

[0017] By adopting the technical scheme, one end of the first steel rope is connected to the fixing base, the other end is connected to the second hooking piece through the guide frame, when the control hoisting mechanism forces the movable plate frame to move upward, the distance between the movable plate frame and the guide frame is continuously increased, the first steel rope automatically pulls the second hooking piece to move to the direction close to the first hooking piece, thereby the hooking pieces can be automatically folded without manual control, and the efficiency of the sediment collection and treatment is further improved.

[0018] Optionally, the linkage mechanism comprises two hinged rods hinged to each other and a torsion spring arranged at the hinge of the two hinged rods, the torsion spring is used to force the two hinged rods to move away from each other; one end of each hinged rod away from the adjacent hinged rod is hinged to a hooking piece.

[0019] By adopting the technical scheme, each two adjacent hooking pieces are connected through two hinged rods, the torsion spring is arranged to always generate the torsion force acting on the two hinged rods, the hinged rods are driven and the two adjacent hooking pieces are forced to move away from each other, thereby the hooking pieces are automatically unfolded in the normal state, so that the mesh bag is unfolded with the hooking pieces and covers the lower side of the dropping chute to collect the sediment.

[0020] Optionally, the hooking piece comprises a moving plate slidably installed in the sliding groove and a lifting hook fixed to the moving plate, the lifting hook is exposed at the bottom of the movable plate frame for the hooking of the hook ring; the lifting hook has a reset stopper for opening and closing, the movable plate frame is provided with a movable component for simultaneously controlling the opening and closing of each reset stopper;

[0021] The movable plate frame is provided with a movable groove in communication with the dropping chute, the movable component comprises a first rod body, a second rod body and a connecting rod connected therebetween, the connecting rod is movably arranged in the movable groove to realize the movement of the movable component to the direction close to / away from the dropping chute;

[0022] In the initial state, the first rod body is located at the side of the lifting hook away from the dropping chute, the second rod body is always located in the dropping chute; the hinge of the two hinged rods in the linkage mechanism is provided with an extension rod, when each hooking piece is folded, the extension rod abuts against the second rod body and moves inward, the first rod body abuts against each reset stopper to simultaneously open the lifting hook bayonet.

[0023] By adopting the technical scheme, the hooks have reset stops for opening and closing, can keep stable connection after the shackle is hooked to the hook, and reduces the possibility that the shackle is accidentally separated from the hooking member due to the buoyancy of wastewater. In addition, after the lifting mechanism is controlled to move the movable plate upward and the two hinge rods of each set of linkage mechanism rotate toward each other, the extension rod can abut against the second rod body and force the second rod body to move inward, and then can drive the first rod body to abut against each reset stop, so that the sockets of each hook are opened at the same time, to facilitate the workers to detach the mesh bag from each hook, and also facilitate the workers to hook each shackle of the new mesh bag to each hook one by one, and facilitate the collection of the precipitate.

[0024] Optionally, the lifting mechanism comprises a winding reel, a second steel rope and a rotating motor. The winding reel is rotatably arranged on the top of the aeration tank. The rotating motor is connected to the winding reel and is configured to drive the winding reel to rotate. One end of the second steel rope is connected to the winding reel, and the other end of the second steel rope is connected to the movable plate frame.

[0025] By adopting the technical scheme, the second steel rope is arranged to connect the winding reel and the movable plate frame. When the rotating motor is controlled to act to wind the second steel rope, the movable plate frame can be pulled by the second steel rope to move along the guide rod set to above the aeration tank, to facilitate the detachment and replacement of the mesh bag. When the rotating motor is rotated to unwind the second steel rope, the movable plate frame can move downward along the guide rod set under the gravity of the movable plate frame, and then the movable plate frame and the mesh bag can stay at the bottom of the aeration tank, to facilitate the collection of the generated precipitate in the mesh bag.

[0026] Optionally, the aeration and stirring device comprises a support assembly rotatably arranged on the bottom of the aeration tank and a driving mechanism configured to drive the support assembly to rotate. The support assembly comprises two side plates and a plurality of stirring rods connected between the two side plates. All the stirring rods are uniformly arranged around the central axis of the side plate.

[0027] The stirring rod is a hollow rod body. The side surface of the stirring rod is provided with a plurality of aeration holes. Each aeration hole is provided with an aeration nozzle. One of the side plates is provided with a plurality of airflow channels. Each airflow channel is connected to the inside of each stirring rod. The side surface of the side plate away from the stirring rod is rotatably connected with an aeration pipeline. The end of each airflow channel away from the stirring rod is connected to the aeration pipeline.

[0028] By adopting the technical scheme, the aeration pipeline is connected to the oxygen generator. The gas with high oxygen content enters each airflow channel through the aeration pipeline, and is sprayed into the wastewater through each aeration nozzle, which can effectively increase the oxygen content in the wastewater, so as to meet the condition of the oxidation of Fe 2+ by the microorganism reaction. At the same time, the driving mechanism is controlled to drive the support assembly to rotate, and each stirring rod between the two side plates can stir the wastewater, which is beneficial to keeping the oxygen content in the wastewater uniform, and is beneficial to the oxidation of Fe2+ sufficiently precipitated.

[0029] Optionally, the support assembly is provided with two groups, the two groups of support assemblies are arranged side by side; the aeration tank bottom is provided with a guide portion, the guide portion is located between the two groups of support assemblies, and the distance from the guide portion to the aeration tank bottom gradually decreases from the middle of the guide portion to the two sides of the guide portion; all the stirring rods are arranged on the outer edge of the side plate side face, and when the driving mechanism drives the support assembly to rotate, each stirring rod intermittently abuts against the surface of the guide portion to scrape the precipitate.

[0030] By adopting the above technical scheme, by arranging the guide portion on the aeration tank bottom, and the middle of the guide portion is higher than the two side edges of the guide portion; the precipitate generated after the wastewater is treated by microorganisms is partially attached to the surface of the guide portion, the driving mechanism is controlled to drive the support assembly to rotate, and each stirring rod of the support assembly can intermittently abut against the surface of the guide portion and scrape the precipitate, so that the precipitate moves to the two side mesh bags, and the collection of the precipitate in the mesh bags is more facilitated.

[0031] Optionally, the driving mechanism includes a driving motor, two worm gears and two worms, the ends of the two worms are connected, and the threads of the two worms are opposite in rotation direction; the driving motor is connected to one of the worms for driving the two worms to rotate simultaneously; the two worm gears are respectively connected to the side plates of the two groups of support assemblies, and the two worm gears are respectively engaged with the two worms for transmission.

[0032] By adopting the above technical scheme, since the threads of the two worms are opposite in rotation direction, when the driving motor is controlled to drive the two worms to rotate simultaneously, the two groups of support assemblies can be driven to rotate in opposite directions through the meshing transmission between the worms and the worm gears, which is more conducive to scraping the precipitate on the surface of the guide portion to move outward, so that the precipitate falls into the mesh bags for collection.

[0033] Optionally, all the aeration nozzles located on the same stirring rod are equidistantly arranged along the axis direction of the stirring rod, and the gas outlet direction of the aeration nozzle is perpendicular to the virtual radial line from the position of the aeration nozzle to the central axis of the side plate.

[0034] By adopting the above technical scheme, by arranging the gas outlet direction of the aeration nozzle to be perpendicular to the virtual radial line from the position of the aeration nozzle to the central axis of the side plate, when the driving mechanism drives the support assembly to rotate, the gas flow blown out by the aeration nozzle can blow up the precipitate and force the precipitate to move outward, which is also conducive to making the precipitate fall into the mesh bags for collection.

[0035] In summary, the present application has at least one of the following beneficial technical effects:

[0036] 1. The precipitate is replaced in two gauze bags on two opposite sides by the agitation of the aeration stirring device. After the reaction is completed, the lifting mechanism is controlled to move the movable plate frame and the gauze bag above the aeration tank. The workers can conveniently remove and replace the gauze bag above the aeration tank, and then conveniently collect and process the precipitate, thereby improving the work efficiency.

[0037] 2. When collecting and processing the precipitate, the hooks are hooked and fixed on the corresponding hooks one by one at the top of the corner position of the aeration tank by controlling the folding mechanism, thereby further improving the work efficiency.

[0038] 3. When the two hinge rods of the linkage mechanism are rotated towards each other by the mutual folding of the hooks, the extension rod can automatically abut against the second rod body and move the second rod body inward. At this time, the first rod body abuts against each reset stopper, and the hook sockets of each hook can be opened at the same time, so as to facilitate the disassembly and replacement of the gauze bag and the collection of the precipitate. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is the wastewater treatment flowchart of the acid mine wastewater treatment system in the embodiment;

[0040] Figure 2 is a half-section schematic view of the aeration tank in the embodiment;

[0041] Figure 3 is a structural schematic view of the aeration stirring device in the embodiment;

[0042] Figure 4 is an enlarged view of A in Figure 3

[0043] Figure 5 is a half-section schematic view of the support assembly in the embodiment, mainly showing the connection structure between the aeration pipeline and the side plate;

[0044] Figure 6 is a structural schematic view of the collecting device in the embodiment;

[0045] Figure 7 is a structural schematic view of the movable plate frame in the embodiment;

[0046] Figure 8 is an enlarged view of B in Figure 6

[0047] Figure 9 is an enlarged view of C in Figure 7

[0048] Figure 10 is a structural schematic view of the hook, the linkage mechanism and the folding mechanism in the embodiment; ​​​

[0049] Figure 11 is Figure 7 is

[0050] BRIEF DESCRIPTION OF DRAWINGS 1, aeration tank; 11, guide part; 12, storage tank; 13, mounting frame; 14, control chamber; 2, aeration stirring device; 3, support assembly; 31, side plate; 311, airflow channel; 32, stirring rod; 33, aeration nozzle; 34, aeration pipeline; 4, driving mechanism; 41, driving motor; 42, worm gear; 43, worm; 5, collecting device; 6, guide rod group;

[0051] 7, movable plate frame; 71, blanking groove; 72, mesh bag; 721, carabiner; 73, sliding groove; 74, hooking piece; 741, moving plate piece; 742, hook; 7421, reset blocking piece; 75, first hooking piece; 76, second hooking piece; 77, linkage mechanism; 771, hinged rod; 772, torsion spring; 781, first rod body; 782, second rod body; 783, connecting rod; 79, extension rod; 70, guide hole;

[0052] 8, hoisting mechanism; 81, rope collecting disc; 82, second steel rope; 83, rotating motor; 9, folding mechanism; 91, fixed seat; 92, guide frame; 93, first steel rope. DETAILED DESCRIPTION

[0053] The following description will be made in conjunction with the accompanying drawings. Figures 1-11 The application is described in further detail.

[0054] The embodiment of the application discloses an acid mine drainage treatment system based on microbial treatment.

[0055] Reference Figure 1 The acid mine drainage treatment system based on microbial treatment comprises a regulating pool, an aeration tank 1, a neutralization pool and a dissolution pool which are sequentially connected. A conveying pipeline is connected to the front end of the regulating pool and used for conveying wastewater into the regulating pool. After the wastewater enters the regulating pool, an alkaline solution is added to adjust the pH value of the wastewater to 3.0. After pressure filtration, the wastewater is introduced into the aeration tank 1. Microbial liquid mainly containing acidophilic iron-oxidizing Thiobacillus is added into the aeration tank 1, and the oxygen content and temperature of the wastewater are adjusted to a suitable range. The wastewater stays for 40-72 h, so that the microorganism oxidizes Fe 2+ to Fe 3+ , and precipitates to form secondary iron minerals such as pyrite and schultesite.

[0056] The wastewater is then introduced into a neutralization tank, where limestone is added to precipitate the remaining metal ions (Cu, As, etc.). The precipitated colloidal substance dissolves in the wastewater, which is then pre-filtered by pressure filtration and discharged into the neutralization tank. An alkaline solution is added to the neutralization tank to adjust the pH of the wastewater to 7.0, enabling the wastewater to meet discharge standards. A discharge pipe is connected to the rear end of the neutralization tank to discharge the wastewater that meets the discharge standards to the outside.

[0057] Specific reference Figure 2 The aeration tank 1 is equipped with a bacterial liquid addition device, an aeration and stirring device 2, and two sets of collection devices 5. The bacterial liquid addition device is used to quantitatively add microbial liquid to the aeration tank 1. Its structure is not the focus of this application, but it is sufficient to achieve the effect of adding microbial liquid. Therefore, it is not specifically shown in the figure.

[0058] Two storage tanks 12 are recessed at the bottom of the aeration tank 1, located on opposite inner walls. Two sets of collection devices 5 are installed within the storage tanks 12 to collect the precipitates produced by the microbial reaction. An aeration and stirring device 2 is positioned between the two sets of collection devices 5. This device increases the oxygen content in the wastewater through aeration and ensures thorough sedimentation through stirring. Simultaneously, the agitation of the aeration and stirring device 2 forces the precipitates to be collected more effectively in the collection devices 5.

[0059] Reference Figure 3 The aeration and stirring device 2 includes a support assembly 3 and a drive mechanism 4. The bottom of the aeration tank 1 is fixed with a mounting frame 13, and the support assembly 3 is rotatably mounted on the mounting frame 13, so that the support assembly 3 is rotatably mounted on the bottom of the aeration tank 1. There are two sets of support assemblies 3, and the two sets of support assemblies 3 are arranged side by side.

[0060] Specifically, refer to Figure 4 The support assembly 3 includes two side plates 31 rotatably mounted on the mounting frame 13 and multiple agitator rods 32 connected between the two side plates 31. In this embodiment, there are six agitator rods 32, all of which are equidistantly arranged around the central axis of the side plates 31. In other embodiments, the number of agitator rods 32 may be five, seven, or eight, as long as they can agitate the wastewater to ensure sufficient sedimentation. The agitator rods 32 in this application are hollow rods, and multiple aeration holes are provided on the side of the agitator rods 32. All aeration holes are connected to the interior of the agitator rods 32, and each agitator rod 32 is equipped with an aeration nozzle 33.

[0061] Reference Figure 5, one of the side plates 31 in the support assembly 3 is internally provided with a plurality of airflow channels 311, the number of the airflow channels 311 is equal to the number of the stirring rods 32, each of the airflow channels 311 is correspondingly communicated with each of the stirring rods 32; the side plate 31 distal to the stirring rods 32 is rotationally connected with an aeration pipeline 34, the aeration pipeline 34 is arranged in the mounting frame 13, and the ends of the airflow channels 311 distal to the stirring rods 32 are gathered and communicated with the aeration pipeline 34. By connecting the aeration pipeline 34 with the oxygen generator, the gas with high oxygen content enters each of the airflow channels 311 and each of the stirring rods 32 through the aeration pipeline 34, and is sprayed into the wastewater through each of the aeration nozzles 33, so that the oxygen content in the wastewater can be effectively increased, so as to achieve the condition of microbial reaction oxidation Fe 2+ .

[0062] Back to Figure 3 , the sidewall of the aeration tank 1 is provided with a control chamber 14 for mounting the driving mechanism 4, the control chamber 14 is closed, which is used to reduce the possibility of wastewater entering; the rotating shaft of the other side plate 31 in the support assembly 3 penetrates into the control chamber 14. The driving mechanism 4 includes a driving motor 41, two worm gears 42 and two worm shafts 43, the two worm shafts 43 are rotationally arranged in the control chamber 14; the ends of the two worm shafts 43 are connected through a shaft coupling, and the screw rotation directions of the two worm shafts 43 are opposite; the driving motor 41 is fixed to the inner sidewall of the control chamber 14, the output shaft of the driving motor 41 is connected with one of the worm shafts 43, which is used to drive the two worm shafts 43 to rotate simultaneously. The two worm gears 42 are connected with the rotating shafts of the two side plates 31 respectively, and the two worm gears 42 are meshed with the two worm shafts 43 respectively, so that the two groups of support assemblies 3 can rotate in opposite directions when the driving motor 41 is actuated.

[0063] Back to Figure 2 , the aeration tank 1 is provided with an integral guide portion 11 at the bottom, the guide portion 11 is located between the two groups of support assemblies 3, and the distance from the guide portion 11 to the bottom of the aeration tank 1 gradually decreases from the middle of the guide portion 11 to both sides of the guide portion 11; refer to Figure 4 , each of the stirring rods 32 is arranged at the outer edge of the side surface of the side plate 31, when the driving mechanism 4 drives the support assembly 3 to rotate, each of the stirring rods 32 can intermittently abut against the surface of the guide portion 11, so as to scrape the deposits on the surface of the guide portion 11 to move away from the guide portion 11, and the centrifugal force of the stirred wastewater can make the deposits fall better on the collecting device 5 for collection.

[0064] In addition, all the aeration nozzles 33 located on the same stirring rod 32 are equidistantly arranged along the axial direction of the stirring rod 32, and the air outlet direction of the aeration nozzle 33 is perpendicular to the virtual radial line from the position of the aeration nozzle 33 to the central axis of the side plate 31; when the driving motor 41 is actuated to drive the bracket assembly 3 to rotate, the airflow blown by the aeration nozzle 33 can blow up the precipitate and force the precipitate to move outward, which is also conducive to the smooth falling of the precipitate to the collecting device 5 for collection.

[0065] Referring to Figure 6 , the collecting device 5 comprises a guide rod set 6, a movable plate frame 7 and a hoisting mechanism 8, wherein the guide rod set 6 comprises two guide rods which are respectively fixed vertically at the corner positions of the aeration tank 1. Referring to Figure 7 , the movable plate frame 7 is provided with two guide holes 70 which are respectively located at the two ends of the extension direction of the movable plate frame 7; by matching the guide holes 70 with the guide rods, the movable plate frame 7 can be slidably connected to the guide rod set 6; the movable plate frame 7 is a rectangular frame structure, and the top surface of the movable plate frame 7 is provided with a through falling material groove 71 which is located at the middle part of the movable plate frame 7; the bottom of the movable plate frame 7 is detachably provided with a mesh bag 72 for collecting the precipitate.

[0066] Referring to Figure 6 , the hoisting mechanism 8 is provided in two groups, and the two groups of hoisting mechanisms 8 are respectively connected to the two ends of the movable plate frame 7 for lifting and stabilizing the movable plate frame 7. Referring to Figure 8 , the hoisting mechanism 8 comprises a winding reel 81, a second steel wire 82 and a rotating motor 83, the rotating motor 83 is fixedly arranged above the aeration tank 1, the winding reel 81 is fixedly connected to the output end of the rotating motor 83, and the winding reel 81 can be driven to rotate by controlling the action of the rotating motor 83; the second steel wire 82 is wound on the winding reel 81, one end of the second steel wire 82 is fixedly connected to the winding reel 81, and the other end of the second steel wire 82 is connected to the movable plate frame 7.

[0067] Referring to Figure 2 , in the initial state, the second steel wire 82 is in a relaxed state, and the movable plate frame 7 moves downward along the guide rod set 6 under the action of its own gravity, and finally the movable plate frame 7 stays in the storage tank 12, so as to collect the generated precipitate; the initial state mentioned here refers to the state when the aeration tank 1 is normally used. In addition, when the rotating motor 83 is actuated to drive the winding reel 81 to rotate and wind the second steel wire 82, the second steel wire 82 can pull the movable plate frame 7 to move upward along the guide rod set 6, and finally the movable plate frame 7 stays above the aeration tank 1, which can facilitate the disassembly and replacement of the mesh bag 72 by the operator.

[0068] Referring to Figure 7The bottom of the movable plate frame 7 is provided with two sliding grooves 73 located at two sides of the material falling groove 71 respectively; a plurality of hooking members 74 are slidingly installed in each sliding groove 73. Specifically referring to Figure 9 The hooking member 74 comprises a moving plate member 741 slidingly arranged in the sliding groove 73 and a hook 742 fixed to the moving plate member 741, and the hook 742 is exposed at the bottom of the movable plate frame 7. In addition, the hook 742 is also provided with a reset blocking member 7421 for opening and closing the aperture, and the reset blocking member 7421 is normally abutted against the hook 742 to close the aperture.

[0069] The open edge of the screen bag 72 is provided with a plurality of hook rings 721 matched with the hooking members 74, and the number of the hook rings 721 is equal to the number of the hooks 742. By one-to-one hooking of the hook rings 721 on the hooks 742, the screen bag 72 can be stably installed on the movable plate frame 7, and the screen bag 72 can also be easily disassembled for subsequent collection and treatment of the precipitates.

[0070] A linkage mechanism 77 is arranged between every two adjacent hooking members 74 in the same sliding groove 73 for connecting the hooking members 74 with each other. The linkage mechanism 77 comprises a torsion spring 772 and two hinged rods 771, the two hinged rods 771 are hinged with each other, and one end of each hinged rod 771 away from the adjacent hinged rod 771 is hinged with the moving plate member 741 of one hooking member 74. The torsion spring 772 is arranged at the hinged position of the two hinged rods 771 to always generate a torsion force acting on the two hinged rods 771, thereby forcing the two hinged rods 771 to move away from each other. Under the action of each group of linkage mechanisms 77, the hooking members 74 can be unfolded, and at this time, the screen bags 72 installed on the hooking members 74 are in an unfolded state and shield the area below the material falling groove 71 for collecting the precipitates.

[0071] Referring to Figure 10 The two hooking members 74 closest to the inner end wall of the sliding groove 73 in the same sliding groove 73 are respectively arranged as a first hooking member 75 and a second hooking member 76. The first hooking member 75 is fixedly connected to the inner end wall of the sliding groove 73, and the second hooking member 76 is connected with a folding mechanism 9. By controlling the folding mechanism 9, the hooking members 74 can be folded towards each other, and the screen bags 72 can be moved to one side end of the movable plate frame 7. This can facilitate the disassembly and replacement of the screen bags 72 at the corner position above the aeration tank 1, and further improve the work efficiency of collecting and treating the precipitates.

[0072] The folding mechanism 9 comprises a fixing base 91, a guide frame 92 and a first steel rope 93. The fixing base 91 is arranged at the top of the aeration tank 1, and the rotating motor 83 mentioned above can be fixed to the fixing base 91. The inner side wall of the aeration tank 1 near the first hooking member 75 is partially provided with an inner groove, the guide frame 92 is fixedly arranged in the inner groove and hidden in the inner groove, and one end of the first steel rope 93 is connected to the fixing frame, and the other end of the first steel rope 93 passes below the guide frame 92 and is connected to the moving plate member 741 of the second hooking member 76.

[0073] In the initial state, the second hooking member 76 moves to the position farthest from the first hooking member 75, at which time the first steel rope 93 is in a taut state. When the control rotating motor 83 is actuated to lift the movable plate frame 7 above the aeration tank 1, the second hooking member 76 can move in the direction close to the first hooking member 75 under the pulling of the first steel rope 93, thereby automatically driving the hooking members 74 to be folded towards each other.

[0074] In addition, with reference to Figure 11 , the movable plate frame 7 is provided with a movable member for simultaneously controlling the opening and closing of the reset stop pieces 7421. The side surface of the movable plate frame 7 is provided with a movable groove above the sliding groove 73, and the movable groove is in communication with the discharging groove 71. The movable member comprises a first rod body 781, a second rod body 782 and a connecting rod 783 connected between the two. The connecting rod 783 is movably arranged in the movable groove, so that the movable member can move in the movable groove towards or away from the discharging groove 71.

[0075] In the initial state, the first rod body 781 is located on the side surface of the hook 742 away from the discharging groove 71, and the first rod body 781 is at the same height as the reset stop piece 7421. The second rod body 782 is always located in the discharging groove 71. With reference to Figure 9 , the hinge of the two adjacent hinge rods 771 in the linkage mechanism 77 is provided with an extension rod 79, which extends upward to the outside of the second rod body 782. When the hooking members 74 are folded towards each other, the two hinge rods 771 in the same group of linkage mechanisms 77 can move close to each other, thereby driving the extension rod 79 to move away from the hooking members 74. At this time, the extension rod 79 can abut against the second rod body 782 and move the second hooking member 76 inward, thereby moving the movable member inward, so that the first rod body 781 abuts against the reset stop piece 7421 of each hook 742 to simultaneously open the bayonet of each hook 742, further facilitating the disassembly and replacement of the screen bag 72.

[0076] The implementation principle of the acid mine drainage treatment system based on microbial treatment in the embodiment of the application is as follows:

[0077] In the process of treating AMD wastewater, the wastewater is introduced into the aeration tank 1 after being preliminarily adjusted in pH value in the adjusting tank, the appropriate microbial liquid containing Acidithiobacillus ferroxidans is added into the aeration tank 1 by using the microbial liquid adding device, the oxygen content in the wastewater is increased and the wastewater is stirred at the same time by using the aeration stirring device 2, and the pH value and the wastewater temperature are adjusted in the appropriate range, so that the Fe 2+ Oxidation generates large-particle precipitates such as pyrite and schultesite, which is beneficial to the removal of Fe element.

[0078] The precipitates generated in the reaction are deposited at the bottom of the aeration tank 1, and the agitation of the aeration stirring device 2 can make the precipitates better fall into the two gauze bags 72 on the two sides; after the reaction is completed and the wastewater is emptied, the movable plate frame 7 and the gauze bag 72 can be moved to above the aeration tank 1 by controlling the action of the winding second steel rope 82 to rotate the motor 83. At the same time, the second hooking member 76 automatically moves to the direction close to the first hooking member 75 under the pulling of the first steel rope 93, which can make each hooking member 74 fold to each other, and then make the gauze bag 72 fold to one side end of the movable plate frame 7; the extension rod 79 can force the movable member to move inward under the driving of the linkage mechanism 77, and then automatically open the lifting hooks 742 by resetting each blocking piece 7421 of the first rod body 781.

[0079] When performing the operation, the operator can conveniently remove the gauze bag 72 and replace the new gauze bag 72 above the aeration tank 1, and then can conveniently collect and process the precipitates in the gauze bag 72, improve the operation efficiency, and greatly reduce the workload and labor intensity of the operator.

[0080] The above is the preferred embodiment of the present application, which does not limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A microbial-based acidic mine wastewater treatment system, comprising an adjustment tank for adjusting the pH of the wastewater, an aeration tank (1) for precipitating Fe, a neutralization tank for neutralizing the precipitated wastewater, and a dissolving tank for dissolving lime; wherein the adjustment tank, aeration tank (1), neutralization tank, and dissolving tank are connected in sequence, the front end of the adjustment tank is connected to a conveying pipe for conveying wastewater, and the rear end of the dissolving tank is connected to a discharge pipe for discharging wastewater; characterized in that: The aeration tank (1) is equipped with a bacterial liquid addition device, an aeration stirring device (2) and two sets of collection devices (5). The two sets of collection devices (5) are respectively located on two opposite inner walls of the aeration tank (1). The aeration stirring device (2) is located between the two sets of collection devices (5), which can increase the oxygen content of wastewater while forcing the sediment to be collected in the collection device (5). The collection device (5) includes a guide rod assembly (6) vertically fixed to the bottom of the aeration tank (1), a movable plate frame (7) slidably connected to the guide rod assembly (6), and a lifting mechanism (8) for forcing the movable plate frame (7) to rise and fall. The top surface of the movable plate frame (7) is provided with a through material drop trough (71), and a mesh bag (72) for collecting sediment is detachably installed at the bottom of the movable plate frame (7). In the initial state, the movable plate frame (7) and the mesh bag (72) are both located at the bottom of the aeration tank (1). By controlling the action of the lifting mechanism (8), the movable plate frame (7) and the mesh bag (72) can be forced to move to the top of the aeration tank (1). The aeration and stirring device (2) includes a support assembly (3) rotatably mounted on the bottom of the aeration tank (1) and a drive mechanism (4) for driving the support assembly (3) to rotate. The support assembly (3) includes two side plates (31) and multiple stirring rods (32) connected between the two side plates (31). All stirring rods (32) are evenly arranged around the central axis of the side plates (31). The support assembly (3) is provided in two sets, and the two sets of support assemblies (3) are arranged side by side; the bottom of the aeration tank (1) is provided with a guide part (11), the guide part (11) is located between the two sets of support assemblies (3), and the distance from the guide part (11) to the bottom of the aeration tank (1) gradually decreases from the middle of the guide part (11) to both sides of the guide part (11); all stirring rods (32) are evenly distributed on the outer edge of the side plate (31), and when the driving mechanism (4) drives the support assembly (3) to rotate, each of the stirring rods (32) intermittently abuts against the surface of the guide part (11) to scrape the sediment; The bottom of the movable plate frame (7) is provided with two sliding grooves (73), and the two sliding grooves (73) are located on both sides of the material drop chute (71); each sliding groove (73) is slidably installed with multiple hooks (74), and the open edge of the mesh bag (72) is provided with multiple hook rings (721) that hook and cooperate with the hooks (74). A linkage mechanism (77) is provided between each pair of adjacent hooks (74) located in the same sliding groove (73) to connect each hook (74) to each other; the two hooks (74) closest to the inner end wall of the sliding groove (73) are respectively designated as the first hook (75) and the second hook (76). The first hook (75) is fixedly connected to the sliding groove (73), and the second hook (76) is connected to a closing mechanism (9). By controlling the action of the closing mechanism (9), each hook (74) can be closed together.

2. The acidic mine wastewater treatment system according to claim 1, characterized in that: The closing mechanism (9) includes a fixed seat (91), a guide frame (92) and a first steel rope (93). The fixed seat (91) is located on the top of the aeration tank (1). The guide frame (92) is fixed to the inner wall of the aeration tank (1) near the first hook connector (75). One end of the first steel rope (93) is connected to the fixed seat (91), and the other end passes under the guide frame (92) and is connected to the second hook connector (76). When the movable plate frame (7) moves upward, the first steel rope (93) pulls the second hook connector (76) to move it closer to the first hook connector (75).

3. The acidic mine wastewater treatment system according to claim 1, characterized in that: The linkage mechanism (77) includes two hinge rods (771) that are hinged to each other and a torsion spring (772) located at the hinge point of the two hinge rods (771). The torsion spring (772) is used to force the two hinge rods (771) to move away from each other. The end of each hinge rod (771) away from the torsion spring (772) is hinged to a hook (74).

4. The acidic mine wastewater treatment system according to claim 3, characterized in that: The hook (74) includes a movable plate (741) slidably mounted on the sliding groove (73) and a hook (742) fixed to the movable plate (741). The hook (742) is exposed at the bottom of the movable plate frame (7) for hooking by the hook ring (721). The hook (742) has a reset stop (7421) for opening and closing. The movable plate frame (7) is provided with a movable component for simultaneously controlling the opening and closing of each reset stop (7421). The movable plate frame (7) has a movable groove on its side that communicates with the material drop chute (71). The movable component includes a first rod (781), a second rod (782), and a connecting rod (783) connecting the two. The connecting rod (783) is movably disposed in the movable groove so that the movable component can move towards / away from the material drop chute (71). In the initial state, the first rod (781) is located on the side of the hook (742) away from the material drop chute (71), and the second rod (782) is always located inside the material drop chute (71); the hinge of the two hinge rods (771) in the linkage mechanism (77) is provided with an extension rod (79). When each of the hooks (74) retracts, the extension rod (79) abuts against the second rod (782) and moves it inward, and the first rod (781) abuts against each reset stop (7421) so as to realize the simultaneous opening of the latch of each hook (742).

5. The acidic mine wastewater treatment system according to claim 1, characterized in that: The lifting mechanism (8) includes a rope take-up reel (81), a second steel rope (82), and a rotating motor (83). The rope take-up reel (81) is rotatably mounted on the top of the aeration tank (1). The rotating motor (83) is connected to the rope take-up reel (81) and is used to drive the rope take-up reel (81) to rotate. One end of the second steel rope (82) is connected to the rope take-up reel (81), and the other end is connected to the movable plate frame (7).

6. The acidic mine wastewater treatment system according to claim 1, characterized in that: The stirring rod (32) is a hollow rod body. The side of the stirring rod (32) is provided with a plurality of aeration holes, and each aeration hole is equipped with an aeration nozzle (33). One of the side plates (31) is provided with a plurality of airflow channels (311), and each airflow channel (311) is connected to the interior of each stirring rod (32). The side of the side plate (31) away from the stirring rod (32) is rotatably connected to an aeration pipe (34), and the end of each airflow channel (311) away from the stirring rod (32) converges and connects to the aeration pipe (34).

7. The acidic mine wastewater treatment system according to claim 1, characterized in that: The drive mechanism (4) includes a drive motor (41), two worm gears (42) and two worms (43). The ends of the two worms (43) are connected together, and the threads of the two worms (43) are opposite. The drive motor (41) is connected to one of the worms (43) to drive the two worms (43) to rotate simultaneously. The two worm gears (42) are respectively connected to the side plates (31) of the two sets of bracket assemblies (3), and the two worm gears (42) respectively mesh with the two worms (43) for transmission.

8. The acidic mine wastewater treatment system according to claim 6, characterized in that: All aeration nozzles (33) located on the same agitator (32) are equidistantly arranged along the axial direction of the agitator (32).

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