CN115448556A - Remediation system and remediation method for heavy metal polluted bottom mud - Google Patents

Abstract

The invention discloses a restoration system and a restoration method for heavy metal polluted bottom mud, which comprises a pretreatment filtering and washing mechanism, a biological enrichment treatment mechanism, a fine filtering and washing mechanism and a bottom mud porosity preparation mechanism; the pretreatment filtering and washing mechanism comprises a washing tank, a bottom sediment conveying pipe is fixedly arranged in the washing tank, a dispersing output ring is fixedly arranged at the lower end of the bottom sediment conveying pipe, and a plurality of bottom sediment output holes are formed in the dispersing output ring; the method comprises the steps that firstly, a pretreatment filtering and washing mechanism and a fine filtering and washing mechanism are utilized to treat bottom mud, so that partial heavy metals and most organic impurities in the bottom mud can be removed, the biological enrichment treatment mechanism with a double-layer design can more accurately control the humidity and the temperature of the bottom mud soil and can carry out controllable ventilation treatment on the bottom mud soil, the heavy metals in the bottom mud are effectively transferred and solidified in plants under the enrichment effect of the plants, and finally, the plants rich in the heavy metals are subjected to pyrolysis.

Description

A repair system and repair method for heavy metal contaminated sediment

technical field

The invention relates to the technical field of bottom mud restoration, in particular to a restoration system and method for heavy metal contaminated bottom mud.

Background technique

Overlying water, sediments at the bottom of the water body and various surrounding environmental conditions constitute a complete water body. River pollution includes two aspects: external source pollution and internal source pollution. Treatment, domestic sewage treatment and many other fields have developed rapidly, and external pollution has been controlled. However, the emphasis on the harmless treatment of river sediment is far less than that of sewage treatment. After pollutants enter the water body, they pass through precipitation, adsorption, biological absorption, etc. Finally, it is deposited in the bottom mud and gradually accumulates. Once the environmental conditions change, the pollutants will be re-released to pollute the water quality of the overlying water through desorption, diffusion, disturbance, etc., and then affect the entire water body.

Contents of the invention

The purpose of the present invention is to provide a repair system and repair method for heavy metal-contaminated bottom mud, which can thoroughly remove heavy metal pollution in bottom mud.

To achieve the above object, the present invention provides the following technical solutions:

A remediation system for heavy metal-contaminated sediment, including a pretreatment and filtration mechanism, a biological enrichment treatment mechanism, a refined filtration and washing mechanism, and a sediment porosity preparation mechanism;

The pretreatment filtering and washing mechanism includes a cleaning tank with an opening facing upwards. A bottom sludge conveying pipe extending up and down is fixed inside the cleaning tank. The upper end of the bottom sludge conveying pipe has a bottom sludge input interface, and the top of the cleaning tank is equipped with a cleaning tank top cover;

A stirring mechanism support frame is fixed on the inner wall of the cleaning tank near the top, and a stirring mechanism is installed on the stirring mechanism support frame. The stirring mechanism includes a stirring shaft that is rotated and connected to the stirring mechanism support frame. fixedly equipped with multiple stirring blades;

The refined filtering and washing mechanism includes a cleaning container with an opening facing upwards and a cleaning swash plate fixed in the cleaning container. The side of the cleaning swash plate has a plurality of rotating cleaning tanks extending forward and backward;

The outer side of the cleaning containment shell close to the higher end of the cleaning slant plate is fixed with a sediment input shell connected to the inside of the cleaning containment shell, and the outer side of the cleaning containment shell close to the lower end of the cleaning slant plate is fixedly provided with a bottom mud input shell connected to the inside of the cleaning containment shell. cleaning discharge shell;

A plurality of cleaning water pipes extending forward and backward are fixed in the cleaning container, and the plurality of cleaning water pipes are arranged one by one above the rotating cleaning tank, and the lower side of the cleaning water pipes has a plurality of cleaning nozzles;

The bottom mud porosity preparation mechanism is used to prepare the bottom mud into porous soil, and the porous soil is used for plant planting by the biological enrichment treatment mechanism;

The bio-enrichment treatment mechanism includes a planting housing with an opening facing upwards, a cultivation and maintenance housing is surrounded on the outside of the planting housing, and the upper end of the cultivation and maintenance housing is sealed and connected to the upper end of the planting housing;

The side wall of the planting housing is a hollow structure, and the inner wall of the planting housing is covered with multi-layer non-woven fabrics;

The outer side of the cultivation and maintenance housing is fixed with a humidity adjustment interface, the outer side of the cultivation and maintenance housing is fixed with a pressurized ventilation interface, and the outer side of the cultivation and maintenance housing is fixed with a balanced exhaust interface, and the balanced exhaust interface is provided with a pressure relief valve.

Preferably, the inner wall of the cleaning tank is fixed with an annular clear water delivery pipe, and the above-mentioned clear water delivery pipe has multiple drainage interfaces;

The lower end of the sediment conveying pipe is fixed with a dispersing output ring. The dispersing output ring has a hollow structure inside and communicates with the sediment conveying pipe. The dispersing output ring has a plurality of sediment output holes communicating with itself.

Description: The dispersing output ring can discharge the sediment to the cleaning tank more evenly.

Preferably, the support frame of the stirring mechanism is fixed with a first motor housing, and the first motor housing is fixed with a first motor. The upper end of the stirring shaft extends to the inside of the first motor housing, and the first motor is used to drive the stirring The shaft turns.

Preferably, the outer wall of the cleaning tank is fixed with a plurality of delivery pump housings, and the first delivery pump is fixed inside the delivery pump housing. The input end of the first delivery pump communicates with the inside of the cleaning tank, and the output of the first delivery pump The end is connected with the sediment input shell through a pipeline.

Description: Multiple first delivery pumps are beneficial to discharge the muddy water mixture in the cleaning tank more quickly and evenly.

Preferably, a tilting cleaning tube extending forward and backward is provided in the rotating cleaning tank, the tilting cleaning tube is provided with slots for the cleaning tube, and the front and rear ends of the tilting cleaning tube are rotatably connected to the side wall of the cleaning container;

A plurality of second motor housings are fixed on the outer wall of the cleaning housing. The positions of the multiple second motor housings correspond to the positions of the plurality of tilting cleaning pipes. The second motor housings are fixed with a second motor. The rotating shaft at one end of the tilting cleaning pipe extends into the housing of the second motor, and the second motor is used to drive the tilting cleaning pipe to rotate.

Explanation: When the sediment flows on the cleaning sloping plate from top to bottom, the tilting cleaning pipe can retain a certain amount of sediment so that the sediment can be temporarily stored in the tilting cleaning pipe. This process is conducive to more thorough cleaning of the sediment Rinse, and then use the motor to drive the tilting cleaning tube to rotate, and dump the sediment temporarily stored in the tilting cleaning tube.

Preferably, the lower end of the cleaning slant plate is rotated in the cleaning container and is equipped with an adsorption roller extending forward and backward. The adsorption roller is driven by a motor to rotate, and a slag discharge scraper is fixed on the right side of the adsorption roller in the cleaning container. A slag discharge conveyor belt is fixed inside the shell on the right side of the slag discharge scraper, the other end of the slag discharge conveyor belt extends to the outside of the cleaning housing, and the outside of the cleaning housing is below the slag discharge conveyor belt.

Description: The adsorption roller is magnetic and can absorb and remove magnetic particle impurities in the sediment.

Preferably, the sediment porosity preparation mechanism includes a solidification preparation barrel with an opening facing upwards, the bottom of the solidification preparation barrel is fixed with an aeration output shell, and the top of the aeration output shell is fixed with an aeration barrel extending up and down that communicates with itself. Conveying pipe, the top of the aeration output shell has a plurality of small aeration holes;

The curing preparation barrel includes a support plate, and an annular lateral support enclosure is connected to the top edge of the support plate. The lateral support enclosure is composed of a plurality of side support plates, and the lower end of the side support plate is connected to the support plate through a movable hinge. The top of the lateral support enclosure is sealed with a second top cover.

Explanation: The bottom mud porosity preparation mechanism can be used to prepare the bottom mud into soil with rich pore structure, which is convenient for subsequent planting.

Preferably, there are first crushing ribs extending up and down on the inner side wall of the side support plate, and second crushing ribs extending up and down on the outer wall of the aeration delivery pipe.

Description: The first broken rib and the second broken rib can form grooves on the solidified bottom mud block, which is convenient for the solidified bottom mud block to be broken and taken out from the solidification preparation barrel.

Preferably, as above-mentioned a kind of repairing system for heavy metal contaminated bottom mud carries out the repair method of heavy metal contaminated bottom mud, comprises the following steps:

S1. Excavating the heavy metal-contaminated bottom mud from the river, drying it in the sun, crushing the dried bottom mud, and then passing the broken bottom mud through a 100-200 mesh sieve;

S2, transport the bottom mud after screening in step S1 to the cleaning tank of the pretreatment filter washing mechanism, and inject clear water into the cleaning tank, use the motor to drive the stirring shaft and make the stirring blades constantly shake the mud-water mixture in the cleaning tank Stir and filter for 30-90 minutes, and then use the first delivery pump to transport the mud-water mixture in the cleaning tank to the sedimentation tank for 2-3 hours;

S3. Transport the sedimented sediment in the sedimentation tank in step S2 to the sediment input shell of the fine filtration and washing mechanism. During the process of the sediment flowing down the cleaning inclined plate, the sediment is washed by the high-speed water jetted from the cleaning nozzle ;

S4. The bottom sludge washed in step S3 is discharged from the cleaning and discharging shell, and then the bottom sludge is dewatered by drying equipment, and the moisture content of the bottom sludge is controlled at 70% to 85%;

S5. Transport the bottom sludge treated in step S4 to the solidification preparation tank of the bottom sludge porosity preparation mechanism, use the aeration output shell to expose a large number of micro air bubbles into the bottom sludge, and heat up the entire solidification preparation tank to control the temperature. Dry and solidify the bottom sludge in the solidification preparation tank at 150°C to 300°C to obtain porous bottom sludge;

S6, breaking the porous bottom mud prepared in step S5 into particles of 0.1 to 1 mm, and adding sand particles in a ratio of 10% to 20% relative to the volume of the porous bottom mud and mixing evenly, the particle size of the sand particles is 0.5 to 2 mm, The bottom mud mixed with sand is placed in the planting container of the biological enrichment treatment mechanism, and plants are planted in the bottom mud to enrich the heavy metals in the bottom mud;

Inject air rich in water vapor from the humidity adjustment interface, the air rich in water vapor passes through the soil in the planting container to replenish moisture to the soil, inject ordinary air through the pressurized ventilation port, and the air flows through the planting container The soil in the body acts as a breather;

When the air permeability of the soil in the planting container is too poor, the pressure relief valve on the balance exhaust port can discharge the injected air in time;

S7. Expose the bottom mud after the plant enrichment treatment to the sun for 10-15 days under the condition that the outdoor temperature is higher than 25°C, stir once every 2-3 hours during the sun exposure process, and then use a filter to mix the bottom mud The sand particles are filtered and separated.

Preferably, in step S5, during the process of exposing a large number of micro-bubbles into the bottom mud, the air pressure in the solidification preparation barrel is kept at 1.2 to 1.8 standard atmospheres at the beginning, and the solidification preparation barrel is treated under the condition of 150°C to 300°C. The bottom sludge is dried and solidified. When the water content of the bottom sludge in the solidification preparation tank drops to 45% to 60%, the air pressure in the solidification preparation tank is adjusted to be uniformly reduced within 10 to 30 seconds until the external air pressure is balanced.

Explanation: Using air pressure changes is beneficial to create a richer pore structure in the bottom mud. When mixing bottom mud and sand as soil for planting plants, it is beneficial for the plant roots to have a certain degree of ventilation.

Compared with the prior art, the beneficial effects of the present invention are: the present invention has reasonable structural design and convenient operation. Firstly, the sediment is treated by using the pretreatment filtering mechanism and the fine filtering mechanism, which can remove part of the heavy metals in the sediment and Most of the organic impurities are convenient for subsequent further processing. The double-layer design of the bio-concentration treatment mechanism can more accurately control the humidity and temperature of the bottom mud soil, as well as controllable ventilation treatment of the bottom mud soil. The heavy metals in the sediment can be effectively transferred and solidified in the plants through the collection effect, and finally these heavy metal-rich plants can be pyrolyzed.

Description of drawings

Fig. 1 is the structural representation of pretreatment filtering and washing mechanism among the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is the structure schematic diagram of refinement filtering and washing mechanism in the present invention;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is the structural representation of biological enrichment treatment mechanism in the present invention;

Figure 6 is a top view of Figure 5;

Fig. 7 is a schematic structural view of the bottom mud porosity preparation mechanism in the present invention;

FIG. 8 is a top view of FIG. 7 .

In the figure, 10-pretreatment filtering mechanism, 11-cleaning tank, 111-top cover of cleaning tank, 12-bottom sludge delivery pipe, 121-bottom sludge input interface, 122-dispersion output ring, 13-clean water delivery tube, 131 -drainage interface, 14-stirring mechanism support frame, 15-stirring mechanism, 151-stirring shaft, 152-stirring blade, 153-first motor housing, 154-first motor, 16-first delivery pump, 161-delivery Pump housing, 30-biological enrichment treatment mechanism, 31-planting housing, 32-cultivation and maintenance housing, 321-humidity adjustment interface, 322-pressurized ventilation interface, 323-balanced exhaust interface, 40-refinement Filtration and washing mechanism, 41-cleaning housing, 42-cleaning inclined plate, 421-rotary cleaning tank, 43-tilting cleaning pipe, 431-cleaning pipe slotting, 44-second motor, 441-second motor housing, 45-bottom sludge input shell, 46-cleaning and discharging shell, 47-cleaning water pipe, 471-cleaning nozzle, 48-adsorption drum, 481-slag discharge scraper, 482-slag discharge conveyor belt, 483-filter residue containing shell, 50- Bottom mud porosity preparation mechanism, 51-solidification preparation barrel, 511-support plate, 512-lateral support enclosure, 513-side support plate, 514-first broken rib, 52-aeration output shell, 53-aeration Air delivery pipe, 531-the second crushing rib, 54-the second top cover.

detailed description

Below in conjunction with Fig. 1-Fig. 8 the present invention is described in detail, for the convenience of narration, the orientation mentioned below is stipulated as follows now: the up, down, left, right, front and back directions mentioned below are consistent with the up, down, left, right, front and back directions of the projection relationship of the respective structural schematic diagrams themselves.

Example 1:

A repair system for heavy metal-contaminated sediment, as shown in Figure 1, Figure 3, Figure 5 and Figure 7, includes a pretreatment and filtration mechanism 10, a biological enrichment treatment mechanism 30, a refined filtration and Mud porosity preparation mechanism 50;

As shown in Figure 1, the pretreatment filter washing mechanism 10 includes a cleaning tank 11 with an opening facing upwards, and a bottom mud delivery pipe 12 extending up and down is fixed in the cleaning tank 11, and the bottom mud delivery pipe 12 upper end has a bottom mud input interface 121, A cleaning tank top cover 111 is installed on the top of the cleaning tank 11;

The inner wall of the cleaning tank 11 is fixed with an annular clear water delivery pipe 13, and the above-mentioned clear water delivery pipe 13 has a plurality of drainage interfaces 131;

The lower end of the sediment conveying pipe 12 is fixed with a dispersion output ring 122. The interior of the dispersion output ring 122 is a hollow structure and communicates with the interior of the sediment conveyance pipe 12. The dispersion output ring 122 has a plurality of sediment outputs connected with itself. Hole 1221.

Cleaning tank 11 inner side walls are fixed with stirring mechanism support frame 14 near the top position, and stirring mechanism support frame 14 is equipped with stirring mechanism 15, and stirring mechanism 15 comprises the stirring shaft 151 that is connected to the stirring mechanism support frame 14 in rotation, and stirring shaft 151 Arranged to extend up and down, the lower end of the stirring shaft 151 is fixed with a plurality of stirring blades 152;

The stirring mechanism supporting frame 14 is fixedly provided with a first motor housing 153, and the first motor housing 153 is fixed with a first motor 154. The upper end of the stirring shaft 151 extends to the inside of the first motor housing 153. The first motor 154 Used to drive the stirring shaft 151 to rotate.

The outer wall of the cleaning tank 11 is fixed with a plurality of delivery pump housings 161 , and the first delivery pump 16 is fixed inside the delivery pump housing 161 , and the input end of the first delivery pump 16 communicates with the inside of the cleaning tank 11 .

As shown in FIG. 3 , the refined filtering and washing mechanism 40 includes a cleaning housing 41 with an opening facing upward and a cleaning swash plate 42 fixed in the cleaning housing 41 . The upper side of the cleaning swash plate 42 has a plurality of rotating cleaning tanks extending forward and backward. 421;

The rotating cleaning tank 421 is provided with a tilting cleaning pipe 43 extending forward and backward. The tilting cleaning pipe 43 has a cleaning pipe slot 431.

As shown in Figure 4, a plurality of second motor housings 441 are fixedly arranged on the outer wall of the cleaning housing 41, and the positions of the multiple second motor housings 441 correspond to the positions of the plurality of tilting cleaning pipes 43, and the second motors A second motor 44 is fixed inside the containing case 441 , and the rotating shaft at one end of the tilting cleaning pipe 43 extends into the second motor containing case 441 , and the second motor 44 is used to drive the tilting cleaning pipe 43 to rotate.

The outer side of the cleaning housing 41, which is close to the higher end of the cleaning swash plate 42, is fixed with a sediment input housing 45 which communicates with the cleaning housing 41, and the output end of the first delivery pump 16 communicates with the sediment input housing 45 through a pipeline. The outer side of the cleaning housing 41 is fixed with a cleaning discharge housing 46 connected to the cleaning housing 41 at the lower end of the cleaning swash plate 42;

A plurality of cleaning water pipes 47 extending forward and backward are fixed inside the cleaning housing 41, and the plurality of cleaning water pipes 47 are arranged one-to-one above the rotating cleaning tank 421, and the lower side of the cleaning water pipe 47 has a plurality of cleaning nozzles 471;

As shown in Figure 3, the lower end of the cleaning swash plate 42 in the cleaning housing 41 rotates and is equipped with an adsorption roller 48 extending forward and backward. A slag discharge scraper 481 is provided, and a slag discharge conveyor belt 482 is fixed on the right side of the slag discharge scraper 481 in the cleaning housing 41. Below the slag discharge conveyor belt 482 is fixedly provided with a filter residue containing case 483 .

The bottom mud porosity preparation mechanism 50 is used to prepare the bottom mud into porous soil, and the porous soil is used in the biological enrichment treatment mechanism 30 for planting;

As shown in FIG. 5 , the biological enrichment treatment mechanism 30 includes a planting housing 31 with an opening facing upwards. The outside of the planting housing 31 is surrounded by a cultivation and maintenance housing 32 . Sealed connection at the upper end;

The side wall of the planting housing 31 is a hollow structure, and the inner wall of the planting housing 31 is covered with multi-layer non-woven fabrics;

As shown in Figure 6, a humidity adjustment interface 321 is fixed on the outside of the cultivation and maintenance housing 32, a pressurized ventilation interface 322 is fixed on the outside of the cultivation and maintenance housing 32, and a balance exhaust interface 323 is fixed on the outside of the cultivation and maintenance housing 32. , There is a pressure relief valve on the balance exhaust port 323 .

As shown in Figure 7, the sediment porosity preparation mechanism 50 includes a solidification preparation barrel 51 with the opening facing upwards, the bottom of the solidification preparation barrel 51 is fixed with an aeration output shell 52, and the top of the aeration output shell 52 is fixed with a The connected aeration delivery pipe 53 extends up and down, and the top of the aeration output shell 52 has a plurality of small aeration holes;

The curing preparation barrel 51 includes a support plate 511, and the top edge of the support plate 511 is connected with an annular lateral support enclosure 512. The lateral support enclosure 512 is composed of a plurality of side support plates 513, and the lower end of the side support plate 513 passes through The living hinge is connected with the support plate 511 , and the top of the lateral support enclosure 52 is sealed with a second top cover 54 .

The inner wall of the side support plate 513 has a first crushing rib 514 extending up and down, and the outer wall of the aeration delivery pipe 53 has a second crushing rib 531 extending up and down.

Example 2:

A method for repairing heavy metal-contaminated bottom mud as described above in a repair system for heavy metal-contaminated bottom mud, comprising the following steps:

S1. Excavate the heavy metal-contaminated bottom mud from the river course and then dry it in the sun, crush the dried bottom mud, and then pass the broken bottom mud through a 200-mesh sieve;

S2, transport the bottom mud after screening in step S1 to the cleaning tank 11 of the pretreatment filter washing mechanism 10, and inject clear water into the cleaning tank 11, utilize the motor to drive the stirring shaft 151 and make the stirring blade 152 opposite to the cleaning tank 11 The mud-water mixture in the tank is continuously stirred and filtered for 30 minutes, and then the mud-water mixture in the cleaning tank 11 is transported to the sedimentation tank for 2 hours by using the first delivery pump 16;

S3. Transport the sedimented sediment in the sedimentation tank in step S2 to the sediment input shell 45 of the refined filter washing mechanism 40. During the process of the sediment flowing down the cleaning inclined plate 42, the high-speed water jetted by the cleaning nozzle 471 is used to Bottom mud is washed;

S4. The bottom sludge after washing in step S3 is discharged from the cleaning and discharging shell 46, and then the bottom sludge is dewatered by using a drying device to control the moisture content of the bottom sludge at 85%;

S5. Transport the bottom sludge treated in step S4 to the solidification preparation bucket 51 of the bottom sludge porosity preparation mechanism 50, use the aeration output shell 52 to expose a large amount of micro air bubbles into the bottom sludge and heat the entire solidification preparation bucket 51 Heating up, the temperature is controlled at 150°C, drying and solidifying the bottom sludge in the solidification preparation tank 51 to obtain porous bottom sludge;

S6. Break the porous bottom mud prepared in step S5 into 1mm particles, and add sand particles with a ratio of 20% of the volume of the porous bottom mud to mix evenly. The particle size of the sand particles is 2mm. The mud is contained in the planting container 31 of the biological enrichment treatment mechanism 30, and rhododendrons are planted in the bottom mud to enrich the heavy metals in the bottom mud;

Inject air rich in water vapor from the humidity adjustment interface 321, the air rich in water vapor passes through the soil in the planting housing 31 to replenish moisture to the soil, inject ordinary air through the pressurized ventilation interface 322, and the air flows through The soil in the planting housing 31 acts as a breather;

When the air permeability of the soil in the planting housing 31 is too poor, the pressure relief valve on the balance exhaust port 323 can discharge the injected air in time;

S7. Expose the bottom mud after the plant enrichment treatment for 10 days under the condition that the outdoor temperature is greater than 25° C., stir once every 3 hours during the exposure process, and then use a filter to filter the mixed sand particles in the bottom mud. Separated by filtration.

In step S5, during the process of exposing a large number of micro-bubbles into the bottom mud, keep the air pressure in the solidification preparation tank 51 at 1.2 standard atmospheric pressure at the beginning, and dry and solidify the bottom mud in the solidification preparation tank 51 under the condition of 150°C , when the water content of the bottom mud in the solidification preparation barrel 51 drops to 60%, adjust the air pressure in the solidification preparation barrel 51 to decrease evenly within 10 seconds to the outside air pressure balance.

Example 3:

A method for repairing heavy metal-contaminated bottom mud as described above in a repair system for heavy metal-contaminated bottom mud, comprising the following steps:

S1. Excavate the heavy metal contaminated bottom mud from the river course and then dry it in the sun, crush the dried bottom mud, and then pass the broken bottom mud through a 100-mesh sieve;

S2, transport the bottom mud after screening in step S1 to the cleaning tank 11 of the pretreatment filter washing mechanism 10, and inject clear water into the cleaning tank 11, utilize the motor to drive the stirring shaft 151 and make the stirring blade 152 opposite to the cleaning tank 11 The mud-water mixture in the tank is continuously stirred and filtered for 90 minutes, and then the mud-water mixture in the cleaning tank 11 is transported to the sedimentation tank for 3 hours by using the first delivery pump 16;

S3. Transport the sedimented sediment in the sedimentation tank in step S2 to the sediment input shell 45 of the refined filter washing mechanism 40. During the process of the sediment flowing down the cleaning inclined plate 42, the high-speed water jetted by the cleaning nozzle 471 is used to Bottom mud is washed;

S4. The washed bottom sludge in step S3 is discharged from the cleaning and discharging shell 46, and then the bottom sludge is dewatered by using a drying device, and the moisture content of the bottom sludge is controlled at 70%;

S5. Transport the bottom sludge treated in step S4 to the solidification preparation bucket 51 of the bottom sludge porosity preparation mechanism 50, use the aeration output shell 52 to expose a large amount of micro air bubbles into the bottom sludge and heat the entire solidification preparation bucket 51 Heating up, controlling the temperature at 300°C, drying and solidifying the bottom sludge in the solidification preparation tank 51 to obtain porous bottom sludge;

S6. Break the porous bottom mud prepared in step S5 into 0.1mm particles, and add sand particles with a ratio of 10% of the volume of the porous bottom mud to mix evenly. The particle size of the sand particles is 0.5mm, and the sand particles will be mixed with The bottom mud is contained in the planting housing 31 of the biological enrichment treatment mechanism 30, and the heavy metals in the bottom mud are enriched by planting holly in the bottom mud;

Inject air rich in water vapor from the humidity adjustment interface 321, the air rich in water vapor passes through the soil in the planting housing 31 to replenish moisture to the soil, inject ordinary air through the pressurized ventilation interface 322, and the air flows through The soil in the planting housing 31 acts as a breather;

When the air permeability of the soil in the planting housing 31 is too poor, the pressure relief valve on the balance exhaust port 323 can discharge the injected air in time;

S7. Expose the bottom mud after the plant enrichment treatment for 15 days under the condition that the outdoor temperature is greater than 25° C., stir once every 3 hours during the exposure process, and then use a filter to filter the mixed sand particles in the bottom mud. Separated by filtration.

In step S5, during the process of exposing a large number of micro-bubbles into the bottom mud, keep the air pressure in the solidification preparation tank 51 at 1.8 standard atmospheric pressure at the beginning, and dry and solidify the bottom mud in the solidification preparation tank 51 under the condition of 300°C , when the water content of the bottom mud in the solidification preparation barrel 51 drops to 45%, the air pressure in the solidification preparation barrel 51 is adjusted to decrease uniformly within 30 seconds until the external air pressure is balanced.

Example 4:

A method for repairing heavy metal-contaminated bottom mud as described above in a repair system for heavy metal-contaminated bottom mud, comprising the following steps:

S1. Excavate the heavy metal contaminated bottom mud from the river course and then dry it in the sun, crush the dried bottom mud, and then pass the broken bottom mud through a 100-mesh sieve;

S2, transport the bottom mud after screening in step S1 to the cleaning tank 11 of the pretreatment filter washing mechanism 10, and inject clear water into the cleaning tank 11, utilize the motor to drive the stirring shaft 151 and make the stirring blade 152 opposite to the cleaning tank 11 The mud-water mixture in the tank is continuously stirred and filtered for 60 minutes, and then the mud-water mixture in the cleaning tank 11 is transported to the sedimentation tank for 3 hours by using the first delivery pump 16;

S3. Transport the sedimented sediment in the sedimentation tank in step S2 to the sediment input shell 45 of the refined filter washing mechanism 40. During the process of the sediment flowing down the cleaning inclined plate 42, the high-speed water jetted by the cleaning nozzle 471 is used to Bottom mud is washed;

S4. The washed bottom sludge in step S3 is discharged from the cleaning and discharging shell 46, and then the bottom sludge is dewatered by using a drying device to control the moisture content of the bottom sludge at 75%;

S5. Transport the bottom sludge treated in step S4 to the solidification preparation bucket 51 of the bottom sludge porosity preparation mechanism 50, use the aeration output shell 52 to expose a large amount of micro air bubbles into the bottom sludge and heat the entire solidification preparation bucket 51 Heating up, controlling the temperature at 200°C, drying and solidifying the bottom sludge in the solidification preparation tank 51 to obtain porous bottom sludge;

S6, the porous bottom mud prepared in step S5 is broken into particles of 0.5mm, and the sand particles with a ratio of 15% of the volume of the porous bottom mud are added to mix evenly, the particle size of the sand particles is 1mm, and the sand particles mixed with the sand particles are mixed. The bottom mud is contained in the planting housing 31 of the bio-enrichment treatment mechanism 30, and Rhododendron and coriander are planted in the bottom mud to enrich the heavy metals in the bottom mud;

Inject air rich in water vapor from the humidity adjustment interface 321, the air rich in water vapor passes through the soil in the planting housing 31 to replenish moisture to the soil, inject ordinary air through the pressurized ventilation interface 322, and the air flows through The soil in the planting housing 31 acts as a breather;

When the air permeability of the soil in the planting housing 31 is too poor, the pressure relief valve on the balance exhaust port 323 can discharge the injected air in time;

S7. Expose the bottom mud after the plant enrichment treatment for 12 days under the condition that the outdoor temperature is greater than 25° C., stir once every 2 hours during the exposure process, and then use a filter to filter the mixed sand particles in the bottom mud. Separated by filtration.

In step S5, during the process of exposing a large number of micro-bubbles into the bottom mud, keep the air pressure in the solidification preparation tank 51 at 1.5 standard atmospheres at the beginning, and dry and solidify the bottom mud in the solidification preparation tank 51 at 200°C , when the water content of the bottom mud in the solidification preparation barrel 51 drops to 50%, the air pressure in the solidification preparation barrel 51 is adjusted to decrease uniformly within 20 seconds until the external air pressure is balanced.

Claims (10)

1. A repair system for heavy metal contaminated bottom mud, characterized in that it comprises a pretreatment filter washing mechanism (10), a biological enrichment treatment mechanism (30), a refined filter washing mechanism (40) and bottom mud porosity preparation mechanism (50); The pretreatment filtering and washing mechanism (10) comprises a cleaning tank (11) with an opening facing upwards, and a bottom mud delivery pipe (12) extending up and down is fixedly installed in the cleaning tank (11), and the bottom mud delivery pipe ( 12) The upper end has a sediment input interface (121), and the top of the cleaning tank (11) is equipped with a cleaning tank top cover (111); The inside wall of the cleaning tank (11) is fixed with a stirring mechanism support frame (14) near the top position, and a stirring mechanism (15) is installed on the described stirring mechanism support frame (14), and the described stirring mechanism (15) includes a rotating fit The stirring shaft (151) connected to the support frame (14) of the stirring mechanism, the stirring shaft (151) is arranged to extend up and down, and the lower end of the stirring shaft (151) is fixedly provided with a plurality of stirring blades (152); The refined filtering and washing mechanism (40) includes a cleaning housing (41) with an opening facing upwards and a cleaning swash plate (42) fixed in the cleaning housing (41), on the cleaning swash plate (42) There are multiple rotating cleaning tanks (421) extending forward and backward; The outer side of the cleaning housing (41) close to the higher end of the cleaning swash plate (42) is fixed with a sediment input housing (45) connected to the cleaning housing (41). The outer side of the shell (41) close to the lower end of the cleaning inclined plate (42) is fixed with a cleaning discharge shell (46) communicating with the inside of the cleaning housing shell (41); The cleaning container (41) is fixed with a plurality of cleaning water pipes (47) extending back and forth, and the plurality of cleaning water pipes (47) are arranged one by one above the rotary cleaning tank (421). The lower side of the water pipe (47) has a plurality of cleaning nozzles (471); The bottom mud porosity preparation mechanism (50) is used to prepare the bottom mud into porous soil, and the porous soil is used for plant planting by the biological enrichment treatment mechanism (30); The bio-enrichment treatment mechanism (30) includes a planting housing (31) with an opening facing upwards, and the outside of the planting housing (31) is surrounded by a cultivation and maintenance housing (32), and the cultivation and maintenance housing (32) The upper end is sealingly connected with the upper end of the planting housing (31); The side wall of the planting housing (31) is a hollow structure, and the inner wall of the planting housing (31) is covered with multi-layer non-woven fabrics; The outside of the cultivation and maintenance housing (32) is fixed with a humidity adjustment interface (321), and the outside of the cultivation and maintenance housing (32) is fixed with a pressurized ventilation interface (322). A balanced exhaust port (323) is fixed on the outer side, and a pressure relief valve is provided on the balanced exhaust port (323). 2. A kind of repairing system for heavy metal polluted bottom mud according to claim 1, it is characterized in that: the inner wall of the cleaning tank (11) is fixedly provided with an annular clear water delivery pipe (13), and the above-mentioned clear water delivery pipe (13) has multiple drainage interfaces (131); The lower end of the bottom mud delivery pipe (12) is fixedly provided with a dispersion output ring (122), the interior of the dispersion output ring (122) is hollow and communicated with the interior of the bottom mud delivery pipe (12), The output ring (122) has a plurality of sediment output holes (1221) communicating with its interior. 3. A repair system for heavy metal-contaminated sediment according to claim 1, characterized in that: a first motor housing (153) is fixed on the support frame (14) of the stirring mechanism, and the second A first motor (154) is fixedly arranged in a motor housing (153), and the upper end of the stirring shaft (151) extends to the inside of the first motor housing (153), and the first motor (154) uses To drive the stirring shaft (151) to rotate. 4. A repair system for heavy metal-contaminated bottom sludge according to claim 1, characterized in that: the outer wall of the cleaning tank (11) is fixedly provided with a plurality of conveying pump housings (161), and the conveying A first delivery pump (16) is fixed inside the pump housing (161), the input end of the first delivery pump (16) communicates with the inside of the cleaning tank (11), and the first delivery pump (16) ) output end communicates with the bottom mud input shell (45) through a pipeline. 5. A repair system for heavy metal-contaminated sediment according to claim 1, characterized in that: said rotary cleaning tank (421) is provided with a tilting cleaning pipe (43) extending forward and backward, and said tilting cleaning pipe (43) The cleaning pipe (43) is provided with a cleaning pipe slot (431), and the front and rear ends of the tilting cleaning pipe (43) are rotationally fitted and connected to the side wall of the cleaning housing (41); The outer wall of the cleaning housing (41) is fixed with multiple second motor housings (441), the positions of the multiple second motor housings (441) and the multiple tilting cleaning pipes (43) Correspondingly, a second motor (44) is fixed inside the second motor housing (441), and the rotating shaft at one end of the tilting cleaning pipe (43) extends into the second motor housing (441). , the second motor (44) is used to drive the tilting cleaning pipe (43) to rotate. 6. The repairing system for heavy metal-contaminated sediment according to claim 1, characterized in that: the lower end of the cleaning swash plate (42) in the cleaning housing (41) is rotated and fitted with a The adsorption drum (48) extending forward and backward, the adsorption drum (48) is driven by a motor to rotate, and the slag discharge scraper (481) is fixed on the right side of the adsorption drum (48) in the cleaning housing (41) A slag discharge conveyor belt (482) is fixed on the right side of the slag discharge scraper (481) in the cleaning housing (41), and the other end of the slag discharge conveyor belt (482) extends to the cleaning container Outside the shell (41), the filter residue containing shell (483) is fixed on the outside of the cleaning containing shell (41) below the slag discharge conveyor belt (482). 7. The repair system for heavy metal-contaminated bottom mud according to claim 1, characterized in that: the bottom mud porosity preparation mechanism (50) includes a solidification preparation bucket (51) with an opening facing upwards, the The bottom of the curing preparation barrel (51) is fixed with an aeration output shell (52), and the top of the aeration output shell (52) is fixed with an aeration delivery pipe (53) extending up and down that communicates with the inside of itself. The top of the aeration output shell (52) has a plurality of small aeration holes; The curing preparation bucket (51) includes a support plate (511), and the top edge of the support plate (511) is connected with an annular lateral support enclosure (512), and the lateral support enclosure (512) is composed of A plurality of side support plates (513) are combined, the lower ends of the side support plates (513) are connected to the support plates (511) through living hinges, and the top of the side support enclosure (52) is sealed with a second top cover (54). 8. A kind of repairing system for heavy metal contaminated bottom mud according to claim 1, characterized in that: there is a first broken rib (514) extending up and down on the inner side wall of the side support plate (513), the The outer wall of the aeration delivery pipe (53) has a second crushing rib (531) extending up and down. 9. According to any one of claims 1 to 8, a repair system for heavy metal-contaminated bottom mud carries out a method for repairing heavy metal-contaminated bottom mud, which is characterized in that it comprises the following steps: S1. Excavating the heavy metal-contaminated bottom mud from the river, drying it in the sun, crushing the dried bottom mud, and then passing the broken bottom mud through a 100-200 mesh sieve; S2, transport the bottom mud after screening in step S1 to the cleaning tank (11) of the pretreatment filter washing mechanism (10), and inject clear water into the cleaning tank (11), utilize the motor to drive the stirring shaft (151) and Make the stirring blade (152) continuously stir and filter the mud-water mixture in the cleaning tank (11) for 30-90 minutes, and then use the first delivery pump (16) to transport the mud-water mixture in the cleaning tank (11) to the sedimentation tank for sedimentation 2～3h; S3, the sedimentation bottom mud in the sedimentation tank of step S2 is transported in the bottom mud input shell (45) of fine filter washing mechanism (40), and in the process that bottom mud flows down along the cleaning inclined plate (42), use the cleaning nozzle ( 471) The jetted high-speed water flow washes the bottom mud; S4. The bottom mud after washing in step S3 is discharged from the cleaning and discharging shell (46), and then the bottom mud is dewatered by using a drying device, and the water content of the bottom mud is controlled at 70% to 85%; S5. Transport the bottom mud processed in step S4 to the solidification preparation barrel (51) of the bottom mud porosity preparation mechanism (50), and use the aeration output shell (52) to expose a large amount of micro air bubbles to the bottom mud and to the whole The solidification preparation barrel (51) is heated to raise the temperature, and the temperature is controlled at 150°C to 300°C, and the bottom sludge in the solidification preparation barrel (51) is dried and solidified to obtain porous bottom sludge; S6, breaking the porous bottom mud prepared in step S5 into particles of 0.1 to 1 mm, and adding sand particles in a ratio of 10% to 20% relative to the volume of the porous bottom mud and mixing evenly, the particle size of the sand particles is 0.5 to 2 mm, The bottom mud mixed with sand is placed in the planting housing (31) of the biological enrichment treatment mechanism (30), and plants are planted in the bottom mud to enrich the heavy metals in the bottom mud; Inject air rich in water vapor from the humidity adjustment interface (321), the air rich in water vapor passes through the soil in the planting housing (31) to replenish moisture to the soil, and the ordinary air passes through the pressurized ventilation interface (322 ) injection, the air flows through the soil in the planting housing (31) to play the role of ventilation; When the air permeability of the soil in the planting housing (31) is too poor, the pressure relief valve on the balance exhaust port (323) can discharge the injected air in time; S7. Expose the bottom mud after the plant enrichment treatment to the sun for 10-15 days under the condition that the outdoor temperature is higher than 25°C, stir once every 2-3 hours during the sun exposure process, and then use a filter to mix the bottom mud The sand particles are filtered and separated. 10. The repairing method of a kind of heavy metal polluted bottom mud according to claim 9, it is characterized in that: in the process that described step S5 is exposed to a large amount of micro-bubbles in bottom mud, keep solidification preparation bucket (51) at the beginning The air pressure in the tank is 1.2 to 1.8 standard atmospheric pressure, and the bottom sludge in the solidification preparation barrel (51) is dried and solidified under the condition of 150°C to 300°C, and the moisture content of the bottom sludge in the solidification preparation barrel (51) is reduced to When the temperature is 45% to 60%, the air pressure in the curing preparation barrel (51) is adjusted to decrease evenly within 10 to 30 seconds until the external air pressure is balanced.

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