CN113944202A

CN113944202A - Inland river jet suction type dredging and curing integrated workboat and working method thereof

Info

Publication number: CN113944202A
Application number: CN202111185737.1A
Authority: CN
Inventors: 邬德宇; 金凤; 王龙; 杨辉; 王庆丰; 曲贝贝; 赵德懿; 刘斌; 李政
Original assignee: Jiangsu University of Science and Technology; CCCC Tianjin Dredging Co Ltd
Current assignee: Jiangsu University of Science and Technology; CCCC Tianjin Dredging Co Ltd
Priority date: 2021-10-12
Filing date: 2021-10-12
Publication date: 2022-01-18

Abstract

The invention discloses an inland river jet-suction type dredging and curing integrated working ship which comprises a ship body, a jet-suction device and a dehydration and curing device, wherein the jet-suction device is positioned at the bow of the ship body, a water pump provides working water for the jet-suction device, a mud suction pipe of the jet-suction device is connected with a flat screen, a mud cabin is positioned below a discharge port at the bottom of the flat screen, an overflow groove is arranged at the tail part of the mud cabin, the lower part of the mud cabin is communicated with a sedimentation tank of the dehydration and curing device through a pipeline provided with a mud pump, and the sedimentation tank, a dehydrator and a centrifuge are all communicated with a tail water tank arranged below the sedimentation tank through a water collecting pipe. The inland river jet-suction type dredging and curing integrated working ship provided by the invention adopts the jet-suction principle to suck mud, and organically combines an independent sludge dewatering treatment device for the ship with a ship body, so that the working ship has multiple functions of dredging, sorting, overflowing, dewatering, tail water treatment and the like.

Description

Inland river jet suction type dredging and curing integrated workboat and working method thereof

Technical Field

The invention belongs to the technical field of ship engineering, relates to a dredging work ship, and particularly relates to an inland river jet-suction type dredging and curing integrated work ship and a working method thereof.

Background

The dredging method for removing polluted soil in river and lake underwater and carrying out engineering treatment is an important content of dredging engineering, and in recent years, with the increasing requirement of human on environmental standards, the prevention and reduction of pollution brought by the dredging engineering to water areas and land areas become an important problem which needs to be considered. The existing various dredger for rivers and lakes in China generally only have dredging function and conveying function, but do not have sludge treatment function. The dredging mode needs to arrange a large piece of sludge discharge site land on the shore, which is difficult to implement in cities and the periphery; the surface water separated by the sludge discharge field enters a peripheral river network from a water outlet, the dewatered sludge is transported to a brick making factory or a refuse landfill and other places, and if the management is not in place in the middle process, secondary pollution to the environment is easily caused; for projects with wide dredging range and large dredging amount, the conveying and processing of the dredged soil can require more construction period and cost.

The sludge dewatering dredger has a dredging soil dewatering function, dewatered soil can be directly ashore or ashore through a barge for recycling, the problem of the existing river and lake dredger can be solved well by the aid of the disposal method, but at present, the research on the dredger with the sludge dewatering function is less in China, the dredger is basically a conceptual ship, and the dredger is general in practicability and has more defects. The patent number ZL201410098022.6, entitled "river channel sludge automatic dehydration dredger and use method thereof", is characterized in that river channel sludge is extracted through a dredger or a suction dredger, solid-liquid separation is carried out on the sludge through a separator, simultaneously reagent is added, then filter pressing operation is carried out on the precipitated slurry to form a mud cake, and water after filter pressing is discharged into a river. The head of the dredger is provided with two dredging machines which comprise a dredger and a suction dredge and seem to have more functions, but in practical application, if the suction dredge is arranged in a dredger body, the suction dredge cannot swing left and right, and needs to swing along with the dredger body, and the construction precision is limited because the inland river water area is limited and difficult to realize; the grab dredger has poor environmental protection performance, the grabbed sludge usually needs to be prepared into a sludge cabin, the sludge cabin is stirred by adding water to enter the drying device, and the process is not controlled well. In addition, water after filter pressing of the dredger is discharged into a river, the water contains artificially added reagents, and the untreated direct discharge can affect the raw water quality; the water content of the slurry water sucked by the dredger is higher, and the subsequent slurry treatment workload is larger.

Disclosure of Invention

The invention aims to overcome the problems and the defects of the existing sludge dewatering dredger and provides an inland river jet suction type dredging and curing integrated working ship and a working method thereof, so that the technical problems of the existing dewatering dredger that the practicability and the environmental protection performance are insufficient, the sludge dewatering handling capacity is large, the efficiency is not high and the like are solved.

In order to achieve the purpose, the invention provides the following technical scheme:

an inland river jet-suction type dredging and curing integrated working ship comprises a ship body, a jet-suction device and a dehydration and curing device, wherein the dehydration and curing device comprises a sedimentation tank, a dehydrator, a centrifuge and a soil processing machine which are sequentially connected through a conveyor belt, and further comprises a flat screen, a temporary storage tank, a river water tank, a mud cabin, an overflow tank, a water pump, a water pipe, a mud suction pipe, a mud pump, a water collecting pipe and a tail water tank, the jet-suction device is positioned at the bow of the ship body, the water pump is communicated with the river water tank and is connected with the jet-suction device through the water pipe to provide working water for the jet-suction device, the mud suction pipe of the jet-suction device is connected with the flat screen, the temporary storage tank is arranged at one side of the flat screen, the mud cabin is positioned below a discharge port at the bottom of the flat screen, the overflow tank is arranged at the tail of the mud cabin, the lower part of the mud cabin is communicated with the sedimentation tank of the dehydration and curing device through a pipeline provided with the mud pump, the sedimentation tank, the dehydrator and the centrifuge are all communicated with the tail water tank arranged below the sedimentation tank, the sedimentation tank and the dehydrator are used for carrying out sedimentation and dehydration treatment on slurry, the centrifuge is used for further separating solid and liquid by utilizing centrifugal force, and the soil processing machine is used for manufacturing dehydrated soil into mud blocks.

Further preferred scheme, the flat screen has certain inclination, is convenient for divide the sieve to silt, but flat screen upper portion is provided with multi-angle pivoted folding grid frame, through folding grid frame can pour the large granule thing that divides the sieve out into in the temporary storage case.

In a further preferred scheme, the dredge pump is connected with the sedimentation tank of the dehydration solidification equipment through a dredge pipe I; the mud pump pass through mud pipe two with the mud cabin links to each other, the mud cabin is for falling trapezoidal, and the muddy water layering of being convenient for and reduction silt are remained, the mud cabin with two intervascular mud intakes of mud pipe are close to mud cabin bottom is convenient for absorb mud.

In a further preferable scheme, a fine mesh for filtering mud is arranged at the connection part of the overflow trough and the mud cabin, and when the loading of the mud cabin approaches or reaches the range, water on the upper layer of the mud cabin can be discharged through the overflow trough so as to reduce the sludge dewatering amount.

In a further preferable scheme, a belt conveyor is arranged on the ship body and adjacent to the soil processing machine, the belt conveyor is connected with the ship body through a movable support, the belt conveyor can rotate 180 degrees and stretch in length on the plane of the ship body, and the treated mud blocks can be conveyed to a shore or a barge through the belt conveyor.

Preferably, the capacity of the water pump is sufficient for the suction amount of the ejection device, but not exceeding the suction amount of the ejection device. The capacity of the injection and suction device is larger than that of the dehydration and solidification device. The capacity of the mud tank can be determined according to the size of a ship body, ship moving operation and the like, and the dehydration solidification equipment can complete the dehydration work of the dredging amount in a time period of dredging and ship moving positioning. The size of the tail water pool is determined according to the purification capacity and the amount of polluted water generated by the dehydration and solidification equipment.

Further preferred scheme, be provided with the deckhouse that supplies crewman's life to settle on the hull, supply crewman's life to settle.

In a further preferred scheme, the ship body is provided with three sets of positioning pile devices which are respectively positioned at the middle slotting positions of the head, the port and the starboard and the tail of the ship body.

In a further preferred scheme, a cab is arranged at the front part of the ship body, and a control console which controls the ejection and suction equipment, the dehydration and solidification equipment, the flat screen, the water pump, the mud pump and the positioning pile device together is arranged in the cab and used for automatically controlling the ship and monitoring the operation and working conditions of the ship.

The invention relates to a working method of an inland river jet-suction type dredger for solidifying mud, which comprises the following steps that firstly, a ship is positioned in an operation mode, and the jet-suction equipment starts dredger operation; after the end surface sludge operation is finished, the ship carries out operation displacement, the ejection and suction equipment stops working in the ship displacement process, and the dehydration and solidification equipment can continuously work; and after the ship is operated and positioned again, the jetting and sucking equipment repeats the dredging operation. The dredging operation of the whole dredging river channel is completed in the cyclic process of positioning, dredging, shifting and positioning of the ship.

The specific content and steps of the work are as follows: the high-pressure working water pump sucks clear water outside a ship through the river water tank, the clear water is pressurized and then is sprayed out at high speed through the underwater nozzle of the jetting and sucking equipment to form a mud-water mixture, and the jetting and sucking equipment sucks the mud-water mixture along the mud suction pipe and conveys the mud-water mixture to the flat screen; after the impurities are screened out by the flat plate screening, the folding grid frame is rotated to enable the impurities to fall into the temporary storage tank, and the screened mud-water mixture enters the mud cabin; the mud cabin is used for carrying out primary sedimentation on the mud-water mixture to enable the mud-water mixture to be layered, the upper part is the mud, the water at the upper part is discharged into a river after being subjected to overflow treatment of the overflow groove, and the mud at the lower part is conveyed to the sedimentation tank of the dewatering and solidifying equipment through the mud pump; the mud is flocculated and primarily filtered by the sedimentation tank, dewatered by the dewatering machine, centrifugally dewatered by the centrifugal machine and converted into soil and polluted water, the soil is made into mud blocks by the soil processing machine and then conveyed to an outboard carrying device by the belt conveyer, and the polluted water is conveyed to the tail water tank by the water collecting pipe and is purified and discharged in the tail water tank.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides an inland river jet-suction type dredging and curing integrated working ship, which adopts the jet-suction principle to suck mud, and organically combines an independent sludge dewatering treatment device for a ship with a ship body, so that the working ship has multiple functions of dredging, sorting, overflowing, dewatering, tail water treatment and the like. The invention has simpler structure, the injection and suction equipment, the dehydration and solidification equipment and the like are easy to maintain and replace, new devices can be replaced along with the improvement of the technical level, the service life of the ship is relatively longer, and the utilization rate is high; the tail water treatment function ensures that the polluted water added with the chemical reagent can clean the water and return to the river channel, so that the links of dredging, solidifying, discharging and transporting in the dredging operation process are more environment-friendly; the overflow function can effectively reduce the amount of sludge dewatering treatment, reduce the dewatering time and cost, and improve the operation condition of the dewatering treatment device, thereby ensuring the operation quality of the dewatering treatment device; the whole ship has reasonable structural layout, perfect working environment and conditions and better practicability. The invention not only has the advantages of the existing sludge dewatering dredger, but also is more environment-friendly, low in consumption, easy to realize, simple to maintain, high in dredging efficiency, lower in dredging cost, easy to control the excavation section, and better in construction quality, and can be widely applied to inland river channel dredging and ecological dredging engineering.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic plan view of a main deck of a hull of an embodiment of the invention;

FIG. 3 is a schematic view of the bilge plane of a ship hull according to an embodiment of the present invention;

in the figure: 1. the device comprises a ship body, 2. a jetting and sucking device, 3. a dehydration and solidification device, 301. a sedimentation tank, 302. a dehydrator, 303. a centrifuge, 304. a soil processing machine, 4. a flat screen, 5. a temporary storage tank, 6. a river water tank, 7. a mud cabin, 8. an overflow tank, 9. a water pump, 10. a water pipe, 11. a mud sucking pipe, 12. a mud pump, 13. a folding grid frame, 14. a mud pipe I, 15. a mud pipe II, 16. a water collecting pipe, 17. a tail water tank, 18. a belt conveyor, 19. a movable support, 20. a deck chamber, 21. a positioning pile device and 22. a cab.

Detailed Description

For the purpose of promoting an understanding of the invention, reference will now be made in detail to the present invention as illustrated in the accompanying drawings. It is to be understood that this description is only illustrative of the invention and is not intended to limit the scope of the invention. Furthermore, it should be understood that various changes and modifications of equivalent forms to the present invention by those skilled in the art after reading the present specification are within the scope of the present patent claims.

Product examples

As shown in fig. 1, 2 and 3, the inland river jet-suction type dredging and solidifying integrated workboat of the present invention comprises a hull 1, a jet-suction device 2 and a dehydration-solidification device 3, wherein the dehydration-solidification device 3 is an independent marine sludge dehydration treatment apparatus comprising a sedimentation tank 301, a dehydrator 302, a centrifuge 303 and a soil processing machine 304 which are sequentially connected through a conveyor belt, and further comprising a flat screen 4, a temporary storage tank 5, a river tank 6, a mud cabin 7, an overflow tank 8, a water pump 9, a water pipe 10, a sludge suction pipe 11, a mud pump 12, a water collection pipe 16 and a tail water tank 17, wherein the jet-suction device 2 is located at the bow of the hull 1, the water pump 9 is communicated with the river tank 6 and connected with the jet-suction device 2 through the water pipe 10 to provide working water for the jet-suction device 2, the sludge suction pipe 11 of the jet-suction device 2 is connected with the flat screen 4, one side of the flat screen 4 is provided with the temporary storage tank 5, the mud cabin 7 is positioned below a discharge port at the bottom of the flat screen 4, and is used for coordinating the operation between the mud dredging equipment and the dehydration and solidification equipment 3 and storing surplus muddy water so that a working ship can still perform dehydration operation when the ship moves or mud is not sucked, and on the other hand, the mud cabin 7 can preliminarily precipitate the muddy water to layer the muddy water due to the fact that the water content of the sucked muddy water is high and the subsequent dehydration processing workload is large; the overflow groove 8 is arranged at the tail part of the mud cabin 7, the lower part of the mud cabin 7 is communicated with the sedimentation tank 301 of the dehydration and solidification equipment 3 through a pipeline provided with the mud pump 12, the sedimentation tank 301, the dehydrator 302 and the centrifuge 303 are communicated with the tail water tank 17 arranged below the sedimentation tank 301 through the water collecting pipe 16, the sedimentation tank 301 and the dehydrator 302 carry out sedimentation and dehydration treatment on mud in a way of adding reagents, the centrifuge 303 further separates solid and liquid by utilizing centrifugal force, and the soil material processing machine 304 makes dewatered soil materials into mud blocks.

As shown in fig. 1, the flat screen 4 has an inclination of 0-60 degrees, which is convenient for screening sludge, the upper portion of the flat screen 4 is provided with a folding grid frame 13 capable of rotating at multiple angles, and large particles screened out can be poured into the temporary storage tank 5 through the folding grid frame 13.

The dredge pump 12 is connected with the sedimentation tank 301 of the dehydration solidification equipment 3 through a dredge pipe I14; the mud pump 12 is connected with the mud cabin 7 through a second mud pipe 15, the mud cabin 7 is in an inverted trapezoid shape, and a mud inlet between the mud cabin 7 and the second mud pipe 15 is close to the bottom of the mud cabin 7.

A fine mesh for filtering mud is arranged at the connection part of the overflow chute 8 and the mud cabin 7, and when the loading of the mud cabin 7 approaches or reaches the range, water on the upper layer of the mud cabin 7 can be discharged through the overflow chute 8, so that the treatment amount of subsequent dewatering work can be effectively reduced.

The water pump 9 is capable of meeting the suction capacity of the ejector device 2, but not exceeding the suction capacity of the ejector device 2. The capacity of the injection and suction device 2 is greater than that of the dehydration curing device 3. The capacity of the mud tank 7 can be determined according to the size of a ship body, the ship moving operation and the like, so that the dehydration solidification equipment 3 can complete the dehydration work of the dredging amount in a period of time for dredging and ship moving positioning. The size of the tail water tank 17 is determined according to the purification capacity and the amount of polluted water generated by the dehydration-solidification equipment 3.

As shown in fig. 1 and 2, a belt conveyor 18 is arranged on the hull 1 adjacent to the earth material processing machine 304, the belt conveyor 18 is connected with the hull 1 through a movable support 19, the belt conveyor 18 can rotate 180 degrees and stretch out and draw back in length on the plane of the hull 1, and the processed mud blocks can be sent to a shore or a barge through the belt conveyor 18.

As shown in fig. 1 and 2, the hull 1 is provided with a deckhouse 20 for a crew to live in.

As shown in fig. 1 and 2, the hull 1 has three sets of spud devices 21, which are respectively arranged at the middle slotted positions of the fore, port and starboard sides and the aft of the hull 1.

As shown in fig. 1 and 2, a cab 22 is provided at the front of the hull 1, and a control console for controlling the injection and suction device 2, the dehydration and solidification device 3, the flat screen 4, the water pump 9, the dredge pump 12 and the spud device 21 is provided in the cab 22, and is used for automatic control of the ship and monitoring the operation and working conditions of the ship.

Fig. 3 is a schematic plan view of the distribution of the bilge structure of the hull in practical use, and the layout of a rudder cabin, a fuel tank, a fresh water cabin, a river tank a and a navigation cabin at the tail of the hull 1 and a head tank, a head ballast tank, a fuel tank and a working pump cabin at the head of the hull 1 are marked in the figure.

Method embodiment

The working method of the inland river jet suction type dredging and curing integrated working ship comprises the following specific contents and steps: the high-pressure working water pump 9 sucks clear water outside the ship through the river water tank 6, the clear water is pressurized and then is sprayed out at high speed from the underwater nozzle of the jetting and sucking equipment 2 through the water pipe 10 to form a mud-water mixture, and the jetting and sucking equipment 2 sucks the mud-water mixture along the mud suction pipe 11 and conveys the mud-water mixture to the flat screen 4; after impurities are sieved out through the flat screen 4, the folding grid frame 13 is rotated to enable the impurities to fall into the temporary storage tank 5, and the sieved mud-water mixture enters the mud cabin 7; the mud-water mixture is primarily precipitated by the mud tank 7, so that mud and water are layered, the upper part is underwater, the upper water is discharged into a river after being subjected to overflow treatment by the overflow chute 8, and the lower mud is conveyed to the sedimentation tank 301 of the dewatering and curing equipment 3 by the mud pump 12; the mud is flocculated and primarily filtered by the sedimentation tank 301, the dewatering treatment of the dewatering machine 302, the centrifugal dewatering of the centrifugal machine 303 is converted into soil and polluted water, the soil is made into mud blocks by the soil processing machine 304 and then is conveyed to an outboard carrying device by the belt conveyer 18, the polluted water is conveyed to the tail water tank 17 by the water collecting pipe 16, the polluted water is purified and discharged in the tail water tank 17, chemical reagents are required to be added into the mud in the dewatering and solidifying processes, and the tail water tank 17 can purify and discharge the polluted water formed after dewatering.

The inland river jet suction type dredger and sludge solidification integrated working ship provided by the invention has the advantages of the existing jet suction type dredger and the existing sludge dewatering dredger, and compared with the existing sludge dewatering dredger, the dredger has the advantages of good dredging quality, higher practicability, better environmental friendliness and higher working efficiency. The automatic dredging device has the advantages of high automation degree, convenience, high efficiency, simple maintenance and high utilization rate in the use process, and is suitable for dredging projects of rivers and lakes, particularly ecological dredging or maintainable dredging projects.

The above are merely embodiments of the present invention, which are described in detail and with particularity, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, all the technical solutions formed by equivalent substitutions or equivalent changes are included in the protection scope of the present invention without departing from the concept of the present invention.

Claims

1. The utility model provides an integrative work ship of formula of dredging solidification is penetrated to inland river, includes hull (1), penetrates and inhales equipment (2) and dehydration curing equipment (3), dehydration curing equipment (3) include sedimentation tank (301), hydroextractor (302), centrifuge (303) and native material processing machine (304) that link to each other in proper order through the conveyer belt, its characterized in that: the water-saving and water-saving ship is characterized by further comprising a flat screen (4), a temporary storage box (5), a river water tank (6), a mud cabin (7), an overflow groove (8), a water pump (9), a water pipe (10), a mud suction pipe (11), a mud pump (12), a water collecting pipe (16) and a tail water tank (17), wherein the ejection suction equipment (2) is located at the bow of the ship body (1), the water pump (9) is communicated with the river water tank (6) and is connected with the ejection suction equipment (2) through the water pipe (10), working water is provided for the ejection suction equipment (2), the mud suction pipe (11) of the ejection suction equipment (2) is connected with the flat screen (4), the temporary storage box (5) is arranged on one side of the flat screen (4), the mud cabin (7) is located below a discharge hole in the bottom of the flat screen (4), the overflow groove (8) is arranged at the tail of the mud cabin (7), and the lower portion of the mud cabin (7) is provided with the dehydration and solidification equipment (12) through a pipeline 3) Sedimentation tank (301) intercommunication, sedimentation tank (301) hydroextractor (302) with centrifuge (303) all pass through collector pipe (16) and setting are in its below tailrace pond (17) intercommunication, sedimentation tank (301) with hydroextractor (302) deposit and dehydration to mud, centrifuge (303) utilizes centrifugal force, further separates solid-liquid, mud piece is makeed into to the earth material after the soil material processing machine (304) will dewater.

2. The inland river suction dredger according to claim 1, characterized in that: dull and stereotyped sieve (4) have 0 ~ 60 inclination, are convenient for divide the sieve to silt, but dull and stereotyped sieve (4) upper portion is equipped with multi-angle pivoted folding grid frame (13), through folding grid frame (13) can pour the large granule thing that divides the sieve out into in interim bin (5).

3. The inland river suction dredger according to claim 1, characterized in that: the mud pump (12) is connected with the sedimentation tank (301) of the dehydration solidification equipment (3) through a mud pipe I (14); the mud pump (12) is connected with the mud cabin (7) through a mud pipe II (15), the mud cabin (7) is in an inverted trapezoid shape, and a mud inlet between the mud cabin (7) and the mud pipe II (15) is close to the bottom of the mud cabin (7).

4. The inland river suction dredger according to claim 1, characterized in that: a fine mesh for filtering mud is arranged at the connection part of the overflow chute (8) and the mud cabin (7), and when the loading of the mud cabin (7) approaches or reaches the range, water on the upper layer of the mud cabin (7) can be discharged through the overflow chute (8).

5. The inland river suction dredger according to claim 1, characterized in that: a belt conveyor (18) is arranged on the ship body (1) and adjacent to the soil processing machine (304), the belt conveyor (18) is connected with the ship body (1) through a movable support (19), the belt conveyor (18) can rotate 180 degrees and stretch in length on the plane of the ship body (1), and processed mud blocks can be conveyed to a shore or a barge through the belt conveyor (18).

6. The inland river suction dredger according to claim 1, characterized in that: the ship body (1) is provided with a deck room (20) for the life arrangement of crews.

7. The inland river suction dredger according to claim 1, characterized in that: the ship body (1) is provided with three sets of positioning pile devices (21) which are respectively positioned at the middle slotting positions of a head port, a head starboard and a tail part of the ship body (1).

8. The inland river suction dredger according to claim 1, characterized in that: the front part of the ship body (1) is provided with a cab (22), the cab (22) is internally provided with a console which controls the ejection and suction equipment (2), the dehydration and solidification equipment (3), the flat screen (4), the water pump (9), the mud pump (12) and the positioning pile device (21) in a lump, and the console is used for automatically controlling the ship and monitoring the operation and working conditions of the ship.

9. The method of operating an inland river suction dredge curing integral working ship as claimed in any one of claims 1 to 8, wherein: the high-pressure working water pump (9) sucks clear water outside a ship through the river water tank (6), the clear water is pressurized and then is sprayed out at high speed through the underwater nozzle of the jetting and sucking equipment (2) through the water pipe (10) to form a mud-water mixture, and the jetting and sucking equipment (2) sucks the mud-water mixture along the mud suction pipe (11) and conveys the mud-water mixture to the flat screen (4); after the impurities are sieved out by the flat screen (4), the folding grid frame (13) is rotated to enable the impurities to fall into the temporary storage tank (5), and the sieved mud-water mixture enters the mud cabin (7); the mud-water mixture is primarily precipitated by the mud cabin (7), so that the mud and water are layered, the upper part is the mud, the water at the upper part is discharged into a river after being subjected to overflow treatment by the overflow chute (8), and the mud at the lower part is conveyed to the sedimentation tank (301) of the dewatering and solidifying equipment (3) by the mud pump (12); the mud is flocculated and primarily filtered by the sedimentation tank (301), dewatered by the dewatering machine (302), centrifugally dewatered by the centrifugal machine (303) and converted into soil and polluted water, the soil is made into mud blocks by the soil processing machine (304) and then is conveyed to an outboard carrying device by a belt conveyor (18), and the polluted water is conveyed to the tail water tank (17) by the water collecting pipe (16) and is discharged after being purified in the tail water tank (17).