Haematococcus culture pond bottom mud heavy metal solidification and stabilization treatment device and method

Abstract

The invention relates to the technical field of haematococcus culture bottom mud treatment, in particular to a haematococcus culture pond bottom mud heavy metal solidification and stabilization treatment device and method. Comprising a moving trolley, a powder sowing machine arranged in the moving trolley, transmission mechanisms arranged on the front side and the rear side of the powder sowing machine, and bottom mud disturbing machines arranged on the left side and the right side of the powder sowing machine. According to the haematococcus culture pond bottom mud heavy metal solidification and stabilization treatment device and method, the moving trolley advances to drive a material conveying roller of a powder sowing machine and a reciprocating lead screw of a bottom mud disturbance machine at the same time through a transmission mechanism, so that powder can be automatically, continuously and uniformly sown to the surface of bottom mud in the moving process of the device; and meanwhile, the stirring part is driven to transversely crush and pre-mix the bottom mud in a reciprocating manner, so that synchronous automation of powder scattering and stirring procedures is realized, and the problems of waste of labor and time cost and possible uneven mixing are avoided, thereby improving the operation continuity of the whole treatment process.

Description

Technical Field

[0001] This invention relates to the field of sediment treatment technology for Haematococcus pluvialis cultivation ponds, and more specifically, to a device and method for solidifying and stabilizing heavy metal sediment in Haematococcus pluvialis cultivation ponds. Background Technology

[0002] During long-term operation of Haematococcus pluvialis cultivation ponds, the bottom sludge accumulates heavy metals such as lead and cadmium. If left untreated, these metals will pollute the surrounding soil and groundwater through leachate, threatening the ecosystem and aquaculture safety. To address this, solidification and stabilization technology can be used. By adding a special solidifying agent and stabilizer to the bottom sludge and thoroughly mixing them, the free heavy metal ions can be converted into chemically stable, low-solidity compounds and firmly encapsulated in the solidified body. This greatly reduces their migration and bioavailability, achieving safe and long-term stabilization.

[0003] Patent application number CN202521609950.4 discloses a multi-stage rinsing tank series-connected bottom sediment heavy metal elution pretreatment equipment, including a rinsing tank with a bottom box fixedly connected to its bottom end; multiple screens set on the inner wall of the rinsing tank, the screens can move up and down within a small range and are arranged in layers along the height direction of the rinsing tank, the screens are used to screen and filter the sand and gravel inside the bottom sediment heavy metal; multiple stirring components, so that the microbial agent can cover the bottom sediment on the layered screens in an all-round and thorough manner, avoiding excessive or insufficient agent in some areas, ensuring that the bottom sediment reacts fully with the agent, and improving the heavy metal elution effect.

[0004] However, in existing technologies, the solidification and stabilization treatment of Haematococcus pluvialis sediment mostly relies on manual labor or single-function mechanical equipment, which has significant drawbacks. First, key processes such as powdering and mixing are separated and need to be completed in batches and steps by different equipment or manual labor. This process is not only time-consuming and labor-intensive, but improper process connection can easily lead to uneven mixing of powder and sediment, affecting the solidification effect. Second, when the equipment is operating back and forth, it either needs to frequently turn around or can only perform a single mode of repeated operation on the sediment. It cannot intelligently complete the complete sequential process of disturbance, powdering, and mixing in a single stroke, making it difficult to ensure the uniformity and stability of the final solidified body.

[0005] In view of this, we propose a device and method for solidifying and stabilizing heavy metals in the bottom mud of a Haematococcus pluvialis culture pond. Summary of the Invention

[0006] The purpose of this invention is to provide a device and method for solidifying and stabilizing heavy metals in the bottom sludge of a Haematococcus pluvialis culture pond. Through the symmetrically arranged ratchet and pawl in the transmission mechanism, the working mode of the bottom sludge agitator on both sides can be automatically determined according to the direction of travel of the moving trolley. The three major processes of pretreatment, chemical addition and stirring are separated in space but connected in time, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A device for solidifying and stabilizing heavy metals in the bottom mud of a Haematococcus pluvialis culture pond includes a mobile trolley, a powder spreader installed inside the trolley, a transmission mechanism installed on the front and rear sides of the powder spreader, and bottom mud agitators installed on the left and right sides of the powder spreader. The powder spreader includes a hopper, a sleeve with an opening at the bottom of the hopper, and a conveying roller inside the sleeve. The outer wall of the conveying roller has several grooves. This setting allows the moving trolley to rotate within the sleeve as it moves, transporting the powder from the hopper through the groove. The transmission mechanism includes an inner rotating wheel, outer rotating wheels disposed on the left and right sides of the inner rotating wheel, a ratchet disposed inside the outer rotating wheel, and a number of pawls disposed in the grooves of the inner wall of the outer rotating wheel, with the two ratchet wheels on the left and right sides symmetrically distributed; When the two outer rotating wheels rotate with the inner rotating wheel, only the ratchet on one side rotates. The bottom sediment agitator includes two connecting rods, a reciprocating screw between the two connecting rods, a movable box outside the reciprocating screw, and a stirring part inside the movable box. When the ratchet rotates, it drives the reciprocating screw to rotate via the connecting rod, thereby causing the moving box to move back and forth laterally. The stirring unit includes a dual-shaft motor and a pair of rakes driven by the dual-shaft motor.

[0008] In the technical solution of the present invention, the mobile trolley includes a frame, a square frame fixed to the inner wall of the frame by bolts, a drive motor fixed to the top corner of the right square frame by bolts, a drive shaft coaxially connected to the output shaft of the drive motor, a pair of bearing seats fixed to the top surface of the right square frame by bolts and sleeved on the outside of the drive shaft, a traveling part arranged on the front and rear sides of the frame, a counterweight wheel rotating on the left side of the frame, and a fixed frame welded to the bottom surface of the frame in pairs.

[0009] This feature provides a stable mobile foundation and power core for the entire device, ensuring the structural strength and operational stability of the equipment during operation.

[0010] In the technical solution of the present invention, the walking part includes a walking wheel that rotates on the outside of a fixed frame via a central shaft, a pair of chain discs, a chain sleeved between the two chain discs, a large gear fixedly connected to the end of the central shaft of the walking wheel by a locking pin, a rotating shaft rotatably connected in another fixed frame, and a small gear locked and fixed to the outer wall of the rotating shaft.

[0011] In the technical solution of the present invention, the upper chain disc is snapped and fixed to the outer wall of the drive shaft, and the lower chain disc is snapped and fixed to the outer wall of the central shaft of the walking wheel, and the large gear meshes with the small gear.

[0012] The above setup efficiently converts driving power into movement and transmission, simultaneously driving the traveling wheels and subsequent working components, thus achieving linkage between travel and operation.

[0013] In the technical solution of the present invention, the hopper is fixedly connected to the top surface of two square frames by bolts, the top of the hopper is open and a cover is placed thereon, the sleeve is snapped and fixed to the outside of the bottom opening of the hopper, the bottom of the sleeve is provided with an inner and outer through slot, the conveying roller is rotatably connected to the inside of the sleeve, and the two ends of the conveying roller are snapped and fixed to the end of the rotating shaft.

[0014] This powder spreader utilizes the rotation and groove structure of the conveying rollers to achieve quantitative, continuous, and uniform conveying and spreading of the curing agent powder.

[0015] In the technical solution of the present invention, the inner rotating wheel is snapped and fixed on the outer wall of the rotating shaft, a synchronous belt is sleeved between the inner rotating wheel and the two outer rotating wheels, a convex shaft is snapped at the center of the outer wall of the outer rotating wheel, an outer frame is sleeved on the outer side of the outer rotating wheel and fixed to the bottom surface of the square frame by bolts, and the end of the convex shaft rotates on the inner wall of the outer frame.

[0016] This design, with its ingenious combination of ratchet and pawl, enables unidirectional selective power transmission, providing a foundation for unidirectional mixing during reciprocating operations.

[0017] In the technical solution of the present invention, one end of the connecting rod rotates on the inner wall of the outer frame, and the other end is engaged and fixed with the reciprocating screw. The outer end of the connecting rod is engaged and fixed with the ratchet. The outer wall and top surface of the movable box are respectively welded with side protrusions and top protrusions. The side protrusions are sleeved on the outer side of the reciprocating screw. The upper protrusions are slidably connected to a slide rod inside. The slide rod is engaged and fixed on the bottom surface of the square frame.

[0018] In the technical solution of the present invention, the dual-axis motor is fixedly connected to the inner wall of the mobile box by bolts, and the output shafts at both ends of the dual-axis motor are coaxially connected to round shafts, and worm gears are clamped and fixed on the outer wall of the round shafts.

[0019] In the technical solution of the present invention, the top end of the rake is engaged with a connecting shaft rotatably connected to the inside of the movable box, and the outer wall of the connecting shaft is engaged with a worm wheel that meshes with the worm.

[0020] The above setup, through a combination of reciprocating lateral movement and rotary stirring, achieves the breaking up and agitation of the bottom sediment, as well as thorough mixing with the powder. On the other hand, the present invention also provides a method for solidifying and stabilizing heavy metals in the sediment of a Haematococcus pluvialis culture pond, using the above-mentioned device for solidifying and stabilizing heavy metals in the sediment of a Haematococcus pluvialis culture pond, comprising the following steps: S1. First, after recovering the algae liquid from the cultivation tank, use a sludge pump to clean out the sludge at the bottom of the tank and pile it into a flat and impermeable U-shaped concrete trough. Allow it to dry naturally until the moisture content drops to 60%. Select ordinary silicate cement and phosphate as the main solidifying agent and auxiliary stabilizer for the bottom sludge treatment, respectively. Mix a certain amount of silicate cement and phosphate and put it into the hopper of the powder spreader. Move the mobile trolley to one side of the concrete trough. S2. Next, start the drive motor in the mobile trolley to drive the drive shaft to rotate. Through the cooperation of the chain and chain, the traveling wheels are driven to rotate, which in turn drives the entire mobile trolley to move outside the concrete trough. At the same time, the large gear that rotates with the traveling wheels meshes with the small gear to drive the rotating shaft to rotate. S3. While the shaft rotates, it drives the conveying roller to rotate inside the sleeve, so that the powder mixed in the hopper continuously falls into several grooves through the upper opening of the sleeve, and after being transported by the conveying roller, it continuously falls onto the bottom mud surface laid below. S4. At the same time, the rotating shaft synchronously drives the inner rotating wheel to rotate, and through the synchronous belt, the outer rotating wheels on both sides of it rotate synchronously, so that several pawls in the outer rotating wheel on the side of the moving trolley can drive the ratchet inside to rotate. S5. As the trolley moves toward the bottom mud, the pawl on one side of the forward direction rotates, which drives the reciprocating screw to rotate through two connecting rods, thereby driving the moving box and the mixing part inside to move back and forth horizontally. The rake in the mixing part is used to pre-disturb and break up the bottom mud. S7. After the moving trolley has completely passed the area where the bottom mud is laid, the drive motor of the moving trolley is directly controlled to reverse, so that the moving trolley can move horizontally again without adjusting its direction. The left and right symmetrical ratchets are used to ensure that the moving box in the direction of the trolley's forward movement can always move back and forth. S8. Subsequently, the evenly mixed material is slightly compacted in the groove, tightly covered with plastic film, and cured. After the cured solidified body is tested for its environmental friendliness, it is transported to the municipal solid waste landfill as a cover soil for zoned landfilling.

[0021] Compared with the prior art, the beneficial effects of the present invention are: 1. The apparatus and method for solidifying and stabilizing heavy metals in the bottom mud of a Haematococcus pluvialis culture pond, wherein the movement of the moving trolley drives the conveying roller of the powder spreader and the reciprocating screw of the bottom mud agitator simultaneously through the transmission mechanism, so that the device can automatically and continuously spread the powder evenly onto the surface of the bottom mud during the movement process, and at the same time drive the mixing unit to perform transverse reciprocating crushing and premixing of the bottom mud, realizing the synchronous automation of the powder spreading and mixing processes, avoiding the waste of labor and time costs, as well as the possible problem of uneven mixing, thereby improving the operational continuity of the entire treatment process.

[0022] 2. The device and method for solidifying and stabilizing heavy metals in the bottom sludge of the Haematococcus pluvialis culture pond, wherein the ratchet and pawl symmetrically arranged in the transmission mechanism can automatically determine the working mode of the bottom sludge agitators on both sides according to the direction of travel of the moving trolley. The rake on the front side only performs reciprocating agitation to prepare loose bottom sludge for subsequent powder application, while the rake on the rear side rotates at high speed under the drive of a dual-shaft motor to fully mix the previously applied powder with the bottom sludge. The three major processes of pretreatment, chemical addition and mixing are separated in space but connected in time, thereby improving the uniformity and automation level of the treatment. Attached Figure Description

[0023] Figure 1 This is one of the overall structural schematic diagrams of the present invention; Figure 2 This is the second schematic diagram of the overall structure of the present invention; Figure 3 This is one of the structural schematic diagrams of the mobile vehicle in this invention; Figure 4 This is the second schematic diagram of the structure of the mobile vehicle in this invention; Figure 5 This is a schematic diagram of the walking mechanism in this invention; Figure 6 This is a schematic diagram of the powder spreader in this invention; Figure 7 This is a cross-sectional schematic diagram of the material conveying roller in this invention; Figure 8 This is a schematic diagram of the transmission mechanism in this invention; Figure 9 This is a partial structural diagram of the transmission mechanism in this invention; Figure 10 This is a cross-sectional schematic diagram of the bottom sediment disturbance mechanism in this invention; Figure 11 This is a schematic diagram of the stirring section in this invention; Explanation of reference numerals in the attached figures: 100. Mobile trolley; 110. Frame; 120. Square frame; 130. Drive motor; 140. Drive shaft; 150. Shaft seat; 160. Walking mechanism; 161. Walking wheel; 162. Chain wheel; 163. Chain; 164. Large gear; 165. Rotating shaft; 166. Small gear; 170. Counterweight wheel; 180. Fixed frame; 200. Powder spreader; 210. Hopper; 220. Cover; 230. Sleeve; 240. Conveying roller; 241. Groove; 300. Transmission mechanism; 310. Inner pulley; 320. Outer pulley; 330. Synchronous belt; 340. Cam shaft; 350. Ratchet; 360. Pad; 370. Outer frame; 400. Bottom mud agitator; 410. Connecting rod; 420. Reciprocating screw; 430. Moving box; 431. Side protrusion; 432. Upper protrusion; 440. Slide rod; 450. Mixing part; 451. Dual-shaft motor; 452. Round shaft; 453. Connecting shaft; 454. Worm gear; 455. Worm wheel; 456. Rake. Detailed Implementation

[0024] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] Please see Figures 1-4 As shown, this embodiment provides a technical solution: A device for solidifying and stabilizing heavy metals in the bottom mud of a Haematococcus pluvialis culture pond includes a mobile trolley 100, a powder spreader 200 installed inside the trolley, a transmission mechanism 300 installed on the front and rear sides of the powder spreader 200, and bottom mud disturbing mechanisms 400 installed on the left and right sides of the powder spreader 200. Specifically, the mobile trolley 100 includes a frame 110, a square frame 120 fixed to the inner wall of the frame 110 by bolts, a drive motor 130 fixed to the top corner of the right square frame 120 by bolts, a drive shaft 140 coaxially connected to the output shaft of the drive motor 130, a pair of bearing seats 150 fixed to the top surface of the right square frame 120 by bolts and sleeved on the outside of the drive shaft 140, a traveling part 160 disposed on the front and rear sides of the frame 110, a counterweight wheel 170 rotating on the left side of the frame 110, and a fixed frame 180 welded in pairs to the bottom surface of the frame 110.

[0026] Furthermore, the frame 110 and the square frame 120 are used to ensure the overall structural strength of the mobile trolley 100. After the drive motor 130 starts, it drives the drive shaft 140 to rotate. The axle seat 150 is used to ensure the stability of the rotation of the drive shaft 140. The counterweight wheel 170 is used to lower the center of gravity of the mobile trolley 100 and ensure the stability of the mobile trolley 100 when it moves. The fixed frame 180 is used to provide a rotation range for the structure in the walking part 160. This setting provides a stable mobile foundation and power core for the entire device, ensuring the structural strength and smooth operation of the equipment during operation.

[0027] Please see Figures 3-5 As shown, in this embodiment, the walking part 160 includes a walking wheel 161 that rotates around a fixed frame 180 via a central shaft, a pair of chain discs 162, a chain 163 sleeved between the two chain discs 162, a large gear 164 fixedly connected to the end of the central shaft of the walking wheel 161 by a locking pin, a rotating shaft 165 rotatably connected to another fixed frame 180, and a small gear 166 locked and fixed to the outer wall of the rotating shaft 165.

[0028] Specifically, the upper chain 162 is snapped and fixed to the outer wall of the drive shaft 140, and the lower chain 162 is snapped and fixed to the outer wall of the central shaft of the traveling wheel 161. The large gear 164 meshes with the small gear 166.

[0029] Furthermore, after the drive shaft 140 rotates, the sprocket 162 and chain 163 work together to drive the traveling wheel 161 to rotate, which in turn drives the entire mobile trolley 100 to move outside the concrete trough. At the same time, the large gear 164 that rotates with the traveling wheel 161 meshes with the small gear 166, which drives the rotating shaft 165 to rotate. This setting efficiently converts the driving power into movement and transmission, and synchronously drives the traveling wheel 161 and subsequent working parts, realizing the linkage between travel and operation.

[0030] Please see Figures 6-7 As shown, in this embodiment, the powder spreader 200 includes a hopper 210, a sleeve 230 with an opening at the bottom of the hopper 210, and a conveying roller 240 disposed inside the sleeve 230. The outer wall of the conveying roller 240 is provided with a plurality of grooves 241. When the moving trolley 100 moves, it drives the conveying roller 240 to rotate inside the sleeve 230, and transports the powder in the hopper 210 through the grooves 241.

[0031] Specifically, the hopper 210 is fixedly connected to the top surface of the two square frames 120 by bolts. The top opening of the hopper 210 is covered with a cover 220, and the sleeve 230 is snapped and fixed to the outside of the bottom opening of the hopper 210. The bottom of the sleeve 230 has a through slot. The conveying roller 240 is rotatably connected to the inside of the sleeve 230, and the two ends of the conveying roller 240 are snapped and fixed to the end of the rotating shaft 165.

[0032] Furthermore, as the rotating shaft 165 rotates, it drives the conveying roller 240 to rotate inside the sleeve 230, allowing the powder mixed in the hopper 210 to continuously fall into several grooves 241 through the upper opening of the sleeve 230. After being transported by the conveying roller 240, it continuously falls onto the surface of the bottom mud laid below. This configuration of the powder spreader 200 utilizes the rotation of the conveying roller 240 and the structure of the grooves 241 to achieve quantitative, continuous, and uniform conveying and spreading of the curing agent powder.

[0033] Please see Figures 8-9 As shown, in this embodiment, the transmission mechanism 300 includes an inner rotating wheel 310, outer rotating wheels 320 disposed on the left and right sides of the inner rotating wheel 310, a ratchet 350 disposed in the outer rotating wheel 320, and a plurality of pawls 360 disposed in the grooves of the inner wall of the outer rotating wheel 320. The two ratchet wheels 350 are symmetrically distributed on the left and right sides. When the two outer rotating wheels 320 rotate with the inner rotating wheel 310, they only drive the ratchet wheel 350 on one side to rotate.

[0034] Specifically, the inner rotating wheel 310 is snapped and fixed on the outer wall of the rotating shaft 165. A synchronous belt 330 is sleeved between the inner rotating wheel 310 and the two outer rotating wheels 320. A convex shaft 340 is snapped at the center of the outer wall of the outer rotating wheel 320. An outer frame 370 is sleeved on the outer side of the outer rotating wheel 320 and fixed to the bottom surface of the square frame 120 by bolts. The end of the convex shaft 340 rotates on the inner wall of the outer frame 370.

[0035] Furthermore, the rotating shaft 165 synchronously drives the inner rotating wheel 310 to rotate, and through the synchronous belt 330, the outer rotating wheels 320 on both sides of it rotate synchronously. The pawls 360 in the outer rotating wheel 320 on the side of the moving trolley 100 can drive the ratchet 350 inside to rotate. This ingenious combination of ratchet 350 and pawl 360 realizes the unidirectional selective transmission of power, providing a basis for unidirectional stirring in reciprocating operation.

[0036] Please see Figures 10-11 As shown, in this embodiment, the bottom sediment agitator 400 includes two connecting rods 410, a reciprocating screw 420 disposed between the two connecting rods 410, a movable box 430 disposed outside the reciprocating screw 420, and a stirring part 450 disposed inside the movable box 430. When the ratchet 350 rotates, it drives the reciprocating screw 420 to rotate through the connecting rods 410, thereby causing the movable box 430 to move back and forth laterally.

[0037] Specifically, one end of the connecting rod 410 rotates on the inner wall of the outer frame 370, and the other end is engaged and fixed with the reciprocating screw 420. The outer end of the connecting rod 410 is engaged and fixed with the ratchet 350. The outer wall and top surface of the moving box 430 are respectively welded with a side protrusion 431 and an upper protrusion 432. The side protrusion 431 is sleeved on the outside of the reciprocating screw 420. The upper protrusion 432 is slidably connected to a slide rod 440, which is engaged and fixed to the bottom surface of the square frame 120.

[0038] Furthermore, the stirring unit 450 includes a dual-shaft motor 451 and a pair of rakes 456 driven by the dual-shaft motor 451.

[0039] Furthermore, the dual-axis motor 451 is fixedly connected to the inner wall of the movable box 430 by bolts. The output shafts at both ends of the dual-axis motor 451 are coaxially connected to round shafts 452, and worm gears 454 are snapped and fixed on the outer wall of the round shafts 452.

[0040] Furthermore, the top of the rake 456 is engaged with a connecting shaft 453 that is rotatably connected inside the movable box 430, and the outer wall of the connecting shaft 453 is engaged with a worm wheel 455 that meshes with the worm 454.

[0041] Furthermore, as the trolley 100 moves toward the bottom mud, the pawl 360 on the forward direction side rotates, and the reciprocating screw 420 rotates through the two connecting rods 410, thereby driving the moving box 430 and the stirring part 450 inside to move back and forth horizontally. The rake 456 in the stirring part 450 is used to pre-disturb and break up the bottom mud. At this time, the dual-shaft motor 451 in the stirring part 450 on the side away from the forward direction is turned on, driving the round shaft 452 to rotate. Through the worm gear 454 meshing with the worm wheel 455, the connecting shaft 453 and the rake 456 are driven to rotate rapidly, thus fully mixing the powder and the bottom mud. This setting achieves the breaking up, agitation, and full mixing of the bottom mud with the powder through the combined motion of reciprocating horizontal movement and rotational stirring.

[0042] This invention also provides a method for solidifying and stabilizing heavy metals in the sediment of a Haematococcus pluvialis culture pond, using the aforementioned device for solidifying and stabilizing heavy metals in the sediment of a Haematococcus pluvialis culture pond, comprising the following steps: S1. First, after recovering the algae liquid from the cultivation tank, use a sludge pump to clean out the sludge at the bottom of the tank and pile it into a flat and impermeable U-shaped concrete trough. Allow it to dry naturally until the moisture content drops to 60%. Select ordinary silicate cement and phosphate as the main curing agent and auxiliary stabilizer for the bottom sludge treatment, respectively. Mix a certain amount of silicate cement and phosphate and put it into the hopper 210 of the powder spreader 200. Move the trolley 100 to one side of the concrete trough. S2. Next, start the drive motor 130 in the mobile trolley 100 to drive the drive shaft 140 to rotate. Through the cooperation of the chain 162 and the chain 163, drive the walking wheel 161 to rotate and drive the mobile trolley 100 to move outside the concrete square trench. At the same time, through the large gear 164 that rotates with the walking wheel 161, meshing with the small gear 166, drive the rotating shaft 165 to rotate. S3. While the rotating shaft 165 rotates, it drives the conveying roller 240 to rotate inside the sleeve 230, so that the powder mixed in the hopper 210 continuously falls into several grooves 241 through the upper opening of the sleeve 230, and after being transported by the conveying roller 240, it continuously falls onto the bottom mud surface laid below. S4. At the same time, the rotating shaft 165 synchronously drives the inner rotating wheel 310 to rotate, and through the synchronous belt 330, the outer rotating wheels 320 on both sides of it rotate synchronously, so that the pawls 360 in the outer rotating wheel 320 on the side of the moving carriage 100 can drive the ratchet 350 inside to rotate. S5. As the moving trolley 100 moves toward the bottom mud, the pawl 360 on the forward direction rotates, and the reciprocating screw 420 rotates through the two connecting rods 410, which in turn drives the moving box 430 and the stirring part 450 inside to move back and forth horizontally. The rake 456 in the stirring part 450 is used to pre-disturb and break the bottom mud. S7. After the moving trolley 100 has completely passed the area where the bottom mud is laid, the drive motor 130 of the moving trolley 100 is directly controlled to reverse, so that the moving trolley 100 can move sideways again without adjusting its direction, and the left and right symmetrical ratchet 350 is used to always allow the moving box 430 in the forward direction of the trolley to move back and forth. S8. Subsequently, the evenly mixed material is slightly compacted in the groove, tightly covered with plastic film, and cured. After the cured solidified body is tested for its environmental friendliness, it is transported to the municipal solid waste landfill as a cover soil for zoned landfilling.

[0043] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the specification and its equivalents.

Claims

1. A device for solidifying and stabilizing heavy metals in the bottom sludge of a Haematococcus pluvialis cultivation pond, characterized in that: It includes a mobile trolley, a powder spreader installed inside it, a transmission mechanism installed on the front and rear sides of the powder spreader, and a bottom mud agitator installed on the left and right sides of the powder spreader. The powder spreader includes a hopper, a sleeve with an opening at the bottom of the hopper, and a conveying roller inside the sleeve. The outer wall of the conveying roller has several grooves. When the moving trolley moves, it drives the conveying roller to rotate inside the sleeve, transporting the powder in the hopper through the grooves. The transmission mechanism includes an inner rotating wheel, outer rotating wheels disposed on the left and right sides of the inner rotating wheel, a ratchet disposed inside the outer rotating wheel, and several pawls disposed in the grooves on the inner wall of the outer rotating wheel. The two ratchet wheels are symmetrically distributed on the left and right sides. When the two outer rotating wheels rotate with the inner rotating wheel, they only drive the ratchet wheel on one side to rotate. The bottom sediment agitator includes two connecting rods, a reciprocating screw between the two connecting rods, a movable box outside the reciprocating screw, and a stirring part inside the movable box. When the ratchet rotates, it drives the reciprocating screw to rotate through the connecting rods, thereby causing the movable box to move back and forth laterally. The stirring unit includes a dual-shaft motor and a pair of rakes driven by the dual-shaft motor.

2. The heavy metal solidification and stabilization treatment device for the bottom sludge of the *Rhodotorula glutinis* culture pond according to claim 1, characterized in that: The mobile trolley includes a frame, a square frame fixed to the inner wall of the frame by bolts, a drive motor fixed to the top corner of the right square frame by bolts, a drive shaft coaxially connected to the output shaft of the drive motor, a pair of bearing seats fixed to the top surface of the right square frame by bolts and sleeved on the outside of the drive shaft, a traveling part set on the front and rear sides of the frame, a counterweight wheel rotating on the left side of the frame, and a fixed frame welded to the bottom surface of the frame in pairs.

3. The heavy metal solidification and stabilization treatment device for the bottom sludge of the *Rhodophyta* culture pond according to claim 2, characterized in that: The walking unit includes a walking wheel that rotates on the outside of a fixed frame via a central shaft, a pair of chain discs, a chain sleeved between the two chain discs, a large gear fixedly connected to the end of the central shaft of the walking wheel by a pin, a rotating shaft rotatably connected to another fixed frame, and a small gear snapped and fixed to the outer wall of the rotating shaft.

4. The heavy metal solidification and stabilization treatment device for the bottom sludge of the *Rhodotorula glutinis* culture pond according to claim 3, characterized in that: The upper chain disc is snapped and fixed to the outer wall of the drive shaft, and the lower chain disc is snapped and fixed to the outer wall of the central shaft of the walking wheel. The large gear meshes with the small gear.

5. The heavy metal solidification and stabilization treatment device for the bottom sludge of the *Rhodophyta* culture pond according to claim 4, characterized in that: The hopper is fixedly connected to the top surface of the two square frames by bolts. The top of the hopper is open and covered with a cap. The sleeve is snapped and fixed to the outside of the bottom opening of the hopper. The bottom of the sleeve has a through slot. The conveying roller is rotatably connected to the inside of the sleeve. The two ends of the conveying roller are snapped and fixed to the ends of the rotating shaft.

6. The heavy metal solidification and stabilization treatment device for the bottom sludge of the *Rhodophyta* culture pond according to claim 5, characterized in that: The inner rotating wheel is snapped and fixed to the outer wall of the rotating shaft. A synchronous belt is sleeved between the inner rotating wheel and the two outer rotating wheels. A convex shaft is snapped at the center of the outer wall of the outer rotating wheel. An outer frame is sleeved on the outer side of the outer rotating wheel and fixed to the bottom surface of the square frame by bolts. The end of the convex shaft rotates on the inner wall of the outer frame.

7. The heavy metal solidification and stabilization treatment device for the bottom sludge of the *Rhodotorula glutinis* culture pond according to claim 6, characterized in that: One end of the connecting rod rotates on the inner wall of the outer frame, and the other end is engaged and fixed with the reciprocating screw. The outer end of the connecting rod is engaged and fixed with the ratchet. Side protrusions and top protrusions are welded to the outer wall and top surface of the movable box, respectively. The side protrusions are sleeved on the outside of the reciprocating screw. A sliding rod is slidably connected inside the top protrusion. The sliding rod is engaged and fixed to the bottom surface of the square frame.

8. The heavy metal solidification and stabilization treatment device for the bottom sludge of the *Rhodotorula glutinis* culture pond according to claim 7, characterized in that: The dual-axis motor is fixedly connected to the inner wall of the mobile box by bolts. The output shafts at both ends of the dual-axis motor are coaxially connected to round shafts, and worm gears are clamped and fixed to the outer wall of the round shafts.

9. The heavy metal solidification and stabilization treatment device for the bottom sludge of the *Rhodotorula glutinis* culture pond according to claim 8, characterized in that: The top of the rake is engaged with a connecting shaft that is rotatably connected inside the moving box, and a worm wheel that meshes with the worm gear is engaged and fixed on the outer wall of the connecting shaft.

10. A method for solidifying and stabilizing heavy metals in the sediment of a *Rhodotorula pulmonarius* culture pond, using the heavy metal solidification and stabilization treatment device for the sediment of a *Rhodotorula pulmonarius* culture pond as described in claim 9, characterized in that... Includes the following steps: S1. First, after recovering the algae liquid from the cultivation tank, use a sludge pump to clean out the sludge at the bottom of the tank and pile it into a flat and impermeable U-shaped concrete trough. Allow it to dry naturally until the moisture content drops to 60%. Select ordinary silicate cement and phosphate as the main curing agent and auxiliary stabilizer for the bottom sludge treatment, respectively. Mix a certain amount of silicate cement and phosphate and put it into the hopper of the powder spreader. Move the mobile trolley to one side of the concrete trough. S2. Next, start the drive motor in the mobile trolley to drive the drive shaft to rotate. Through the cooperation of the chain and chain, the traveling wheels are driven to rotate, which in turn drives the entire mobile trolley to move outside the concrete trough. At the same time, the large gear that rotates with the traveling wheels meshes with the small gear to drive the rotating shaft to rotate. S3. While the shaft rotates, it drives the conveying roller to rotate inside the sleeve, so that the powder mixed in the hopper continuously falls into several grooves through the upper opening of the sleeve, and after being transported by the conveying roller, it continuously falls onto the bottom mud surface laid below. S4. At the same time, the rotating shaft synchronously drives the inner rotating wheel to rotate, and through the synchronous belt, the outer rotating wheels on both sides of it rotate synchronously, so that several pawls in the outer rotating wheel on the side of the moving trolley can drive the ratchet inside to rotate. S5. As the trolley moves toward the bottom mud, the pawl on one side of the forward direction rotates, which drives the reciprocating screw to rotate through two connecting rods, thereby driving the moving box and the mixing part inside to move back and forth horizontally. The rake in the mixing part is used to pre-disturb and break up the bottom mud. S6. At this time, turn on the dual-shaft motor in the mixing section on the side away from the direction of forward movement, drive the round shaft to rotate, and drive the connecting shaft and rake to rotate quickly through the worm gear meshing with the worm wheel, so as to fully mix the powder and the bottom mud. S7. After the moving trolley has completely passed the area where the bottom mud is laid, the drive motor of the moving trolley is directly controlled to reverse, so that the moving trolley can move horizontally again without adjusting its direction. The left and right symmetrical ratchets are used to ensure that the moving box in the direction of the trolley's forward movement can always move back and forth. S8. Subsequently, the evenly mixed material is slightly compacted in the groove, tightly covered with plastic film, and cured. After the cured solidified body is tested for its environmental friendliness, it is transported to the municipal solid waste landfill as a cover soil for zoned landfilling.

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