JP5767517B2 - Sludge treatment apparatus and treatment method thereof - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a sludge treatment apparatus and a treatment method thereof for precipitating a treatment liquid containing sludge in a sedimentation separation tank and extracting the settled sludge to the outside.

  Solid-liquid separation using a sedimentation separation tank is a simple solid-liquid separation system that uses gravity sedimentation of solid particles due to the density difference between solid particles and liquid, and is therefore widely used in various fields. Here, the method for extracting sludge, which is solid particles settled and deposited on the bottom of the sedimentation tank, is provided with a lower pipe having a discharge valve at the bottom of the sedimentation tank, and the sludge is removed by periodically opening the discharge valve. Generally, it is extracted downward and discharged.

  However, when a sedimentation tank is used in a nuclear facility, if sludge containing radioactive material is blocked by a pipe, a great deal of labor is required for restoration, and in some cases, there is a possibility that it cannot be reused. Therefore, the following technologies have been developed.

  A jet nozzle for fluidizing the sludge and a sludge extraction nozzle for extracting the sludge are placed in the storage tank where the sludge is submerged in a position where the sludge is buried, and water is sprayed onto the sludge locally by the jet nozzle. A technique has been developed in which fluidized sludge is fluidized and the fluidized sludge is extracted in a horizontal direction by a sludge extraction nozzle (see, for example, Patent Document 1).

  In addition, the end of the suction transfer pipe is placed in a position where the end of the suction transfer pipe is buried in the settling sand in the sand settling tank, and the sand is fluidized by spraying on the sedimented sand from a water jet nozzle arranged around the suction transfer pipe. A technique for sucking fluidized sand upward by a suction transfer pipe is disclosed (for example, see Patent Document 2).

Japanese Patent No. 3480878 Japanese Patent Laid-Open No. 2008-30021

  However, in the technique described in Patent Document 1, since the sludge is extracted in the horizontal direction by the sludge extraction nozzle, there is a possibility that the sludge remains in the sludge extraction nozzle and is fixed inside the nozzle after the sludge extraction operation. It was.

  Moreover, since the technique described in Patent Document 2 has a flat bottom surface of the sand settling basin, the sand cannot be collected in one place until the sand sucking is completed. The sand could not be efficiently fluidized locally by the eruption.

  Therefore, an object of the present invention is to provide a sludge treatment apparatus capable of efficiently fluidizing sludge settled in a sedimentation separation tank and extracting it to the outside.

In order to achieve the above object, a sludge treatment apparatus of the present invention has a bottom portion having a slanted side peripheral surface toward a lower end portion, and a sedimentation separation tank that forms sludge contained in the treatment liquid at the bottom portion to form a deposited sludge. The tip of the ejection nozzle is placed toward the lower end of the sedimentation separation tank, the fluidizing liquid is sprayed onto the sedimentation sludge, and the fluidizing liquid ejection pipe that fluidizes the sludge and the fluidized sludge from the tip of the extraction nozzle The sludge extraction pipe that is drawn upward and the tip of the jet nozzle of the fluidizing liquid jet pipe
Auxiliary fluidized liquid ejection pipe with the auxiliary ejection nozzle tip located above, and a sludge extraction pipe extraction nose
And an auxiliary sludge extraction pipe with an auxiliary extraction nozzle tip disposed above the tip of the fluid.
Either the outlet nozzle tip or the outlet nozzle tip is buried in the accumulated sludge.
Sprayed by the auxiliary fluidizing liquid jet pipe, and the subsidence of the buried part by the auxiliary drain pipe
The tip of the ejecting nozzle of the fluidizing liquid ejecting pipe and the tip of the extracting nozzle of the extracting pipe
Is separated from the upper surface of the deposited sludge, characterized in Rukoto.

In order to achieve the above object, the sludge treatment method of the present invention uses the above sludge treatment apparatus.
The sludge treatment method used includes a step of allowing sludge to settle in a sedimentation separation tank, a fluidizing liquid jetting process in which fluidized liquid is sprayed toward the lower end of the sedimentation separation tank, and a fluidized sludge is drawn upward. The sludge extraction process to be performed and the tip of the ejection nozzle of the fluidized liquid ejection pipe or the extraction pipe of the extraction pipe
When one of the tips of the sludge is buried in sediment sludge, it is sprayed by the auxiliary fluidized liquid jet pipe.
Then, the sludge in the buried part is extracted by the auxiliary extraction pipe,
And a step of separating the tip of the outlet nozzle and the tip of the outlet nozzle of the outlet pipe from the upper surface of the accumulated sludge .

According to the present invention, when the tip of the ejection nozzle or the tip of the extraction nozzle is buried in the accumulated sludge
In addition, the tip of the ejection nozzle or the tip of the extraction nozzle is exposed above the accumulated sludge to provide the optimum arrangement.
The sludge settled in the sedimentation tank can be efficiently fluidized and extracted outside.

The schematic longitudinal cross-sectional view of the sludge processing apparatus which concerns on the 1st Embodiment of this invention. The schematic longitudinal cross-sectional view of the sludge processing apparatus which concerns on the 2nd Embodiment of this invention. The schematic longitudinal cross-sectional view of the sludge processing apparatus which concerns on the 3rd Embodiment of this invention. The schematic longitudinal cross-sectional view of the sludge processing apparatus which concerns on the 4th Embodiment of this invention. The schematic longitudinal cross-sectional view of the sludge processing apparatus which concerns on the 5th Embodiment of this invention. The modification of the bottom part of the sedimentation tank of the sludge processing apparatus which concerns on the 1st Embodiment of this invention is shown, (a) is a schematic perspective view which shows the example which made the bottom part the reverse quadrangular pyramid shape, (b) is a bottom part. The schematic perspective view which shows the example made into the shape which combined the inverted square pyramid, (c) is a schematic perspective view which shows the example which made the bottom part the groove | channel shape whose cross section is V shape. The table | surface which shows the result of the sludge extraction test of the sludge processing apparatus which concerns on the 1st Embodiment of this invention. The table | surface which shows the result of the sludge extraction test of the sludge processing apparatus which concerns on the 2nd Embodiment of this invention.

  Embodiments of the present invention will be described below.

(First embodiment)
(Constitution)
Hereinafter, a sludge treatment apparatus according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic longitudinal sectional view of a sludge treatment apparatus according to the first embodiment of the present invention. The sludge treatment apparatus 1 includes a sedimentation separation tank 2, a fluidizing liquid ejection pipe 3, a sludge extraction pipe 4, a fluidizing liquid ejection apparatus 5, and a sludge transfer apparatus 6. Furthermore, the fluidized liquid ejecting apparatus 5 includes a steam supply device 7a and a steam ejector 8a. The sludge transfer device 6 includes a steam supply device 7b and a steam ejector 8b.

  The sedimentation / separation tank 2 has a container shape having an inverted conical bottom 2c in which the side peripheral surface 2b is inclined toward the lower end 2a. In the sedimentation separation tank 2, a treatment liquid 21 containing sludge is poured into the inside from the top, and the sludge is sedimented to the bottom 2 c to form a deposited sludge 22.

  Furthermore, it is desirable to incline the side peripheral surface 2b of the sedimentation separation tank 2 at a steeper angle than an underwater repose angle of sludge described later. Moreover, metal oxides, such as a zirconium oxide mentioned later, can be applied as sludge. Furthermore, water, alcohol, TBP (tributyl phosphate), or the like can be applied as the liquid medium of the treatment liquid 21.

  The fluidizing liquid ejection pipe 3 is arranged so that the ejection direction of the fluidizing liquid 32 at the ejection nozzle tip 3 a that is one end is directed toward the lower end 2 a of the sedimentation separation tank 2. The height of the ejection nozzle tip 3a and the inclination angle of the ejection nozzle tip 3a will be described later. Further, the other end of the fluidizing liquid ejection pipe 3 is connected to the steam ejector 8a.

  The steam ejector 8 a is provided in the processing liquid 21, and the steam supply device 7 a is provided outside the sedimentation separation tank 2. The fluidizing liquid ejecting device 5 is configured by connecting the steam supply device 7a and the steam ejector 8a with a pipe through which the steam 31 can be circulated.

  The fluidized liquid ejecting apparatus 5 supplies the steam 31 to the steam ejector 8a by the steam supply apparatus 7a. The steam ejector 8 a sucks the supernatant liquid of the surrounding processing liquid 21 by using the flow of the steam 31 or the negative pressure generated inside by the condensation of the steam 31 as a power, and the jet nozzle of the fluidizing liquid jet pipe 3 as the fluidizing liquid 32. The fluidized sludge 33 is formed by ejecting from the tip 3a and fluidizing the vicinity of the upper surface of the deposited sludge 22.

  The sludge extraction pipe 4 is arranged in the processing liquid 21 with the extraction nozzle tip 4a, which is one end, facing downward. The height of the extraction nozzle tip 4a will be described later. The other end of the sludge extraction pipe 4 is connected to the steam ejector 8b.

  The steam ejector 8b and the steam supply device 7b are provided outside the sedimentation tank 2. The sludge transfer device 6 is configured by connecting the steam supply device 7b and the steam ejector 8b with a pipe through which the steam 31 can be circulated.

  The sludge transfer device 6 supplies the steam 31 to the steam ejector 8b by the steam supply device 7b. The steam ejector 8b extracts fluidized sludge 33 upward from the extraction nozzle tip 4a of the sludge extraction pipe 4 by using the flow of the steam 31 or the negative pressure generated internally by the condensation of the steam 31 as power.

  As the mutual arrangement relationship between the fluidizing liquid ejection pipe 3 and the sludge extraction pipe 4, an ejection nozzle tip 3a and an extraction nozzle tip 4a are provided on both sides of a perpendicular extending upward from the lower end 2a. Furthermore, it is desirable to make the distances to the vertical lines equal.

(Function)
The operation of the first embodiment of the present invention will be described below. First, a sludge extraction test using the sludge treatment apparatus 1 will be described, and the sludge extraction action will be described later.

  A sludge extraction test using the sludge treatment apparatus 1 was performed. Zirconium oxide (specific gravity 5.6) powder (particle size: about 100 μm) was used as sludge. Further, water was applied as a liquid medium for the treatment liquid 21.

  First, the zirconium oxide powder was spread on a container having a flat bottom, the container was tilted gently, and the angle of repose of the zirconium oxide was measured by measuring the angle at which the zirconium oxide slides. The angle of repose of the zirconium oxide powder in water was 40 to 42 °.

  Therefore, an inverted conical shape in which the inclination angle of the side peripheral surface 2b of the bottom 2c of the sedimentation separation tank 2 is 45 °, which is steeper than the repose angle of the zirconium oxide powder in water, was applied. Furthermore, the sedimentation tank 2 was manufactured with the opening at the top of the sedimentation tank 2 having a diameter of 1000 mm. Further, the inner diameters of the fluidizing liquid ejection pipe 3 and the sludge extraction pipe 4 were set to 25 mm.

  First, the jet nozzle tip 3a of the fluidizing liquid jet pipe 3 is directed to the lower end 2a, tilted by 30 ° with respect to a perpendicular extending upward from the lower end 2a, and the jet nozzle tip 3a is further lowered to the lower end 2a of the sedimentation separation tank 2 To a height of 85 mm.

  Further, the extraction nozzle tip 4a is disposed on the opposite side of the ejection nozzle tip 3a across a perpendicular extending upward from the lower end 2a, and the height of the extraction nozzle tip 4a is set to the ejection nozzle as shown in FIG. Sludge extraction by changing three patterns 40 mm below the tip 3 a (Run No. 1), the same height as the jet nozzle tip 3 a (Run No. 2), and 40 mm above the jet nozzle tip 3 a (Run No. 3) The test was conducted.

  A treatment liquid 21 was used in which zirconium oxide powder as sludge was contained in 200 liters of water at an initial charge of 12.5 kg. When the treatment liquid 21 was poured into the settling separation tank 2 to deposit the zirconium oxide powder to form the deposited sludge 22, the upper surface of the deposited sludge 22 was positioned within 10 mm below the ejection nozzle tip 3a.

The flow rate of the ejected water from the fluidizing liquid ejection pipe 3 is set to 2 m ³ / h, the flow rate from the sludge ejection pipe 4 is set to 6 m ³ / h, and the ejection of the fluidizing liquid 32 from the fluidizing liquid ejection pipe 3 is started 4 After a minute, extraction from the sludge extraction pipe 4 was started, and the fluidized sludge 33 was extracted from the sludge extraction pipe 4 for 2 minutes while continuing to eject the fluidizing liquid 32 from the fluidizing liquid ejection pipe 3. After the completion, all the zirconium oxide powder remaining in the settling tank 2 was collected and dried, the mass was measured, and the extraction ratio was calculated by the equation (1).

Sludge extraction rate = (initial charge amount−residual amount) / initial charge amount (1)
FIG. 7 is a table showing the results of the sludge extraction test of the sludge treatment apparatus according to the first embodiment of the present invention. From FIG. 7, when the extraction nozzle tip 4a is the same height as the ejection nozzle tip 3a (Run No. 2) and when it is 40 mm below the ejection nozzle tip 3a (Run No. 1), the accumulated sludge 22 is almost completely removed. All were extracted. When the extraction nozzle tip 4a was 40 mm above the ejection nozzle tip 3a (Run No. 3), 72% of the accumulated sludge was extracted.

  When the extraction nozzle tip 4a is 40 mm above the ejection nozzle tip 3a (Run No. 3), the extraction rate is 72% in the first extraction, but 12.5 kg of sludge is newly added in 200 liters from this state. When the sludge extraction test of the next batch was performed, the 200 liter fluidized sludge 33 extracted in the next batch contained about 12.5 kg of sludge, and the sludge extraction rate Was almost 100%. Therefore, even if the extraction nozzle tip 4a is 40 mm above the ejection nozzle tip 3a (Run No. 3), the accumulated sludge 22 can be sufficiently extracted in the actual operation of the sedimentation separation tank 2.

  Hereinafter, the extraction action of the sludge treatment apparatus 1 will be described. The bottom 2c of the sedimentation separation tank 2 has the side peripheral surface 2b inclined toward the lower end 2a at an angle steeper than the angle of repose of the sludge, so that the sludge in the treatment liquid 21 is removed until the sludge extraction is completed. The sedimentation sludge 22 can be formed by lowering and gathering to the lower end 2a.

  Further, since the jet nozzle tip 3a of the fluidizing liquid jet pipe 3 sprays the fluidizing liquid 32 toward the lower end 2a, the fluidizing liquid 32 is sprayed toward the deposited sludge 22 until the sludge is completely extracted. The fluidized sludge 33 can be formed by fluidization. Further, since the sludge extraction pipe 4 extracts the fluidized sludge 33 upward from the extraction nozzle tip 4a, the fluidized sludge 33 inside the sludge extraction pipe 4 flows down after the sludge extraction is completed, and the sludge is extracted. It is possible to prevent the fluidized sludge 33 from being dried and fixed inside the pipe 4.

  In the above-described sludge extraction test, water containing 12.5 kg of sludge in 200 liters is poured into the settling separation tank 2, and a total of 200 liters of fluidized liquid 32 is ejected, and finally the fluidization of 200 liters is performed. 12.5 kg of sludge is recovered in the sludge 33.

  Here, in actual operation, the upper part of the sedimentation tank 2 is extended upward by 5 to 10 meters to form a cylindrical shape, and a shape in which 1000 to 2000 liters of processing liquid 21 can be poured. In this case, for example, when the processing liquid 21 containing 12.5 kg of sludge in 1000 liters is poured, after the deposited sludge 22 is formed on the bottom 2c, 800 liters of the supernatant liquid is collected in advance and the processing in the sedimentation separation tank 2 is performed. The sludge extraction described above is performed in a state where the liquid 21 is 200 liters.

  Alternatively, when the fluidizing liquid ejection pipe 3 and the sludge extraction pipe 4 can sufficiently eject the fluidizing liquid 32 and the fluidized sludge 33 that can sufficiently withstand the water pressure, they are treated in the sedimentation separation tank 2. Under the condition that 1000 liters of the liquid 21 exists, 200 liters of fluidized sludge 33 can be extracted, and the sludge having the above-described sludge extraction rate can be recovered.

  Furthermore, the following changes are possible about the height of the ejection nozzle front-end | tip 3a. In the sludge extraction test shown in FIG. 7 described above, the ejection nozzle tip 3 a is placed within 10 mm from the upper surface of the deposited sludge 22 by placing the ejection nozzle tip 3 a at a height of 85 mm from the lower end 2 a of the sedimentation separation tank 2. However, the test was further performed with the ejection nozzle tip 3 a set 100 mm above the upper surface of the accumulated sludge 22. At this time, the extraction nozzle tip 4a is set to Run No. When the same condition as 1 was used, the extraction rate was 80% or more. If the extraction rate is 80% or more, as described above, the accumulated sludge 22 can be sufficiently extracted in the actual operation of the settling tank 2.

  Accordingly, the ejection nozzle tip 3 a of the fluidizing liquid ejection pipe 3 is arranged at 0 mm to 100 mm from the upper surface of the accumulated sludge 22. Further, the extraction nozzle tip 4a of the sludge extraction tube 4 is arranged at a position of −50 mm to 50 mm from the height of the ejection nozzle tip 3a, and further arranged below the ejection nozzle tip 3a so as not to be buried in the accumulated sludge. It is desirable to do.

  Further, the angle of the ejection nozzle tip 3a of the fluidizing liquid ejection pipe 3 is the same for all angles from 0 ° to an angle parallel to the inclination angle of the side peripheral surface 2b with respect to the perpendicular extending upward from the lower end 2a. If the angle is 10 ° with respect to the perpendicular extending from the lower end 2a of the bottom 2c of the sedimentation separation tank 2 to an angle parallel to the inclination angle of the side peripheral surface 2b, the higher extraction is achieved. It was confirmed that efficiency could be obtained.

  The bottom part 2c of the sedimentation tank 2 of this embodiment can be modified as follows. FIG. 6: shows the modification of the bottom part of the sedimentation-separation tank of the sludge processing apparatus which concerns on the 1st Embodiment of this invention, (a) is a schematic perspective view which shows the example which made the bottom part an inverted quadrangular pyramid shape, ) Is a schematic perspective view showing an example in which the bottom portion is formed by combining inverted quadrangular pyramids, and (c) is a schematic perspective view showing an example in which the bottom portion has a V-shaped cross section. As shown in FIG. 6, any shape other than the inverted cone is applicable as long as the side peripheral surface 2b is inclined from the opening of the bottom 2c to the lower end 2a.

  In FIG. 6A, the bottom 2c is changed to an inverted conical shape to form an inverted quadrangular pyramid shape. In this case, the same effect can be exhibited by arranging the above-described ejection nozzle tip 3a and extraction nozzle tip 4a with the top of the inverted quadrangular pyramid as the lower end 2a.

  In FIG. 6B, the bottom 2c has a shape in which two inverted quadrangular pyramids are arranged. In this case, a lower end 2a is formed at each of the tops of the two inverted square pyramids. At this time, the same action can be exhibited by providing two fluidizing liquid ejection pipes 3 and two sludge extraction pipes 4 and disposing each of them against the lower end 2a.

  In FIG. 6C, the bottom 2c has a groove shape with a V-shaped cross section. In this case, a linear lower end 2a is formed at the tip of the V-shaped groove. At this time, by providing a plurality of fluidizing liquid ejection pipes 3 or by injecting the ejection nozzle tip 3a so as to be inclined in the longitudinal direction of the groove shape, the fluid flows into the linear accumulated sludge 22 formed on the linear lower end 2a. The chemical liquid 32 can be sprayed and extracted by the sludge extraction pipe 4.

(effect)
According to the first embodiment of the present invention, the sludge in the treatment liquid 21 is reduced to the lower end 2a by setting the side peripheral surface 2b of the bottom 2c of the sedimentation separation tank 2 to be steeper than the repose angle of the sludge in water. The sludge 22 can be formed by being lowered and gathered toward the bottom. Further, by spraying the fluidizing liquid 32 toward the lower end portion 2a by the ejection nozzle tip 3a of the fluidizing liquid ejection pipe 3, the accumulated sludge 22 can be efficiently fluidized and extracted until the sludge extraction is completed. it can.

  Moreover, the maintenance cost and the frequency of equipment replacement can be reduced by applying a transfer device using a negative pressure by a fluid such as steam jets 8a and 8b as a power source for the fluidized liquid jetting device 5 and the sludge transfer device 6. be able to. Furthermore, instead of the steam jets 8a and 8b, an air jet, an air lift, a siphon, or the like can be applied.

  Further, when external water is ejected to the sediment sludge 22 as the fluidizing liquid 32, the water is discharged out of the system as supernatant water obtained by sedimentation and separation of the sludge by the sedimentation operation. Especially in nuclear facilities such as nuclear power plants and spent fuel reprocessing plants, the supernatant water may be contaminated and may need to be treated in the next process. Accordingly, the fluidizing liquid jet pipe 3 and the steam jet 8a are installed in the processing liquid 21 in the sedimentation separation tank 2, and the processing liquid 21 flows by sucking the supernatant liquid of the surrounding processing liquid 21 using the steam 31 as power. It can be used as the liquefying liquid 32.

(Second Embodiment)
(Constitution)
Hereinafter, a sludge extraction apparatus according to a second embodiment of the present invention will be described with reference to FIG. The same parts as those of the sludge extraction apparatus according to the first embodiment are denoted by the same reference numerals, and description of the same configuration is omitted.

  FIG. 2 is a schematic longitudinal sectional view of a sludge treatment apparatus according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that the arrangement of the fluidizing liquid ejection pipe 3 and the sludge extraction pipe 4 is changed.

  As a mutual arrangement relationship between the fluidizing liquid ejection pipe 3 and the sludge extraction pipe 4, the fluidizing liquid ejection pipe 3 has an ejection nozzle tip 3a disposed on a perpendicular extending upward from the lower end 2a, and the ejection nozzle tip 3a. The fluidizing liquid 32 is ejected in the direction toward the lower end 2a. In the sludge extraction pipe 4, the extraction nozzle tip 4 a is arranged around the ejection nozzle tip 3 a of the fluidized liquid jet pipe 3. The heights of the ejection nozzle tip 3a and the extraction nozzle tip 4a will be described later.

(Function)
The operation of the second embodiment of the present invention will be described below. The ejection nozzle tip 3a is arranged on a perpendicular line extending from the lower end 2a to the ejection nozzle tip 3a, the ejection direction is directed vertically downward, and the height of the ejection nozzle tip 3a is 85 mm from the lower end 2a. The fluidizing liquid ejection pipe 3 was fixed. Further, the extraction nozzle tip 4a is connected to the Run No. Arrangement was made in three patterns of 4 to 6, and the extraction test of the deposited sludge 22 was performed.

  A treatment liquid 21 containing 12.5 kg of zirconium oxide powder as sludge in 200 liters of water was applied. When the treatment liquid 21 was poured into the settling separation tank 2 to deposit the zirconium oxide powder to form the deposited sludge 22, the upper surface of the deposited sludge 22 was positioned within 10 mm below the ejection nozzle tip 3a.

The ejection flow rate from the fluidizing liquid ejection pipe 3 is 2 m ³ / h, the ejection flow rate from the sludge extraction pipe 4 is 6 m ³ / h, and sludge is 4 minutes after the ejection from the fluidizing liquid ejection pipe 3 is started. The extraction from the extraction pipe 4 is started, and the extraction from the sludge extraction pipe 4 is performed for 2 minutes while continuing the injection from the fluidization liquid injection pipe 3, and the discharge from the fluidization liquid injection pipe 3 and the sludge extraction are performed. Extraction from tube 4 was stopped. After the completion, all the zirconium oxide powders remaining in the sedimentation separation tank 2 were collected and dried to measure the mass, and the sludge extraction rate was calculated by the above-described equation (1).

  FIG. 8 is a table showing the results of the sludge extraction test of the sludge treatment apparatus according to the second embodiment of the present invention. From FIG. 8, when the extraction nozzle tip 4a is the same height as the ejection nozzle tip 3a (Run No. 5) and when it is 40 mm below the tip of the fluidized liquid jet tube 3 (Run No. 4), the accumulated sludge Almost all were extracted. When the extraction nozzle tip 4a was 40 mm above the ejection nozzle tip 3a (Run No. 6), 82% of the accumulated sludge 22 was extracted.

  When the extraction nozzle tip 4a is 40 mm above the ejection nozzle tip 3a (Run No. 6), the extraction rate is 82% in the first extraction, but from this state, 12.5 kg of sludge is newly added in 200 liters. When the sludge extraction test of the next batch was performed, the 200 liter fluidized sludge 33 extracted in the next batch contained about 12.5 kg of sludge, and the sludge extraction rate Was almost 100%. Therefore, even when the extraction nozzle tip 4a is 40 mm above the ejection nozzle tip 3a (Run No. 6), the accumulated sludge 22 can be sufficiently extracted in the actual operation of the sedimentation separation tank 2.

  Similarly to the first embodiment, the ejection nozzle tip 3 a of the fluidizing liquid ejection pipe 3 is disposed from 0 mm to 100 mm from the upper surface of the accumulated sludge 22. Further, the extraction nozzle tip 4a of the sludge extraction tube 4 is arranged at a position of -50 mm to 50 mm from the height of the ejection nozzle tip 3a, and further arranged below the ejection nozzle tip 3a so as not to be buried in the accumulated sludge. It is desirable.

(effect)
According to the second embodiment of the present invention, the ejection nozzle tip 3a is arranged on a perpendicular extending upward from the lower end 2a, and the ejection direction of the fluidized liquid 32 at the ejection nozzle tip 3a is directed toward the lower end 2a. By arranging and arranging the discharge nozzle tip 4a around the jet nozzle tip 3a of the fluidizing liquid jet pipe 3, the fluidizing liquid 32 is directed toward the lower end 2a by the jet nozzle tip 3a of the fluidizing liquid jet pipe 3. And the accumulated sludge 22 can be efficiently fluidized and extracted until the sludge extraction is completed.

(Third embodiment)
(Constitution)
Hereinafter, a sludge treatment apparatus according to a third embodiment of the present invention will be described with reference to FIG. The same parts as those of the sludge extraction apparatus according to the first embodiment are denoted by the same reference numerals, and description of the same configuration is omitted.

  FIG. 3 is a schematic longitudinal sectional view of a sludge treatment apparatus according to the third embodiment of the present invention. The third embodiment is different from the first embodiment in that an auxiliary fluidizing liquid ejection pipe 9, an auxiliary sludge extraction pipe 10, an auxiliary fluidizing liquid ejection apparatus 11, and an auxiliary sludge transfer apparatus 12 are newly added. It is a point provided in. The auxiliary fluidizing liquid ejecting device 11 includes a steam supply device 7c and a steam ejector 8c. The auxiliary sludge transfer device 12 is composed of a steam supply device 7d and a steam ejector 8d.

  The auxiliary fluidizing liquid ejection pipe 9 has an auxiliary ejection nozzle tip 9 a, which is one end, installed 50 mm to 100 mm above the ejection nozzle tip 3 a of the fluidizing liquid ejection pipe 3. Further, the other end of the auxiliary fluidizing liquid jet pipe 9 is connected to the steam ejector 8c.

  The steam ejector 8 c is provided in the processing liquid 21, and the steam supply device 7 c is provided outside the sedimentation separation tank 2. The auxiliary fluidizing liquid ejection device 11 is configured by connecting the steam supply device 7c and the steam ejector 8c with piping for supplying the steam 31.

  The auxiliary sludge extraction pipe 10 has an auxiliary extraction nozzle tip 10a, which is one end, installed 50 mm to 100 mm above the extraction nozzle tip 4a of the sludge extraction pipe 4. Further, the other end of the auxiliary sludge extraction pipe 10 is connected to the steam ejector 8d.

  The steam ejector 8d and the steam supply device 7d are provided outside the sedimentation separation tank 2. The auxiliary sludge transfer device 12 is configured by connecting the steam supply device 7d and the steam ejector 8d by piping for supplying the steam 31.

(Function)
The operation of the third embodiment of the present invention will be described below. In the sludge treatment apparatus 1, the ejection nozzle tip 3a is buried in the accumulated sludge 22 because the amount of sludge flowing into the sedimentation separation tank 2 is large, or the sludge extraction interval is long and the amount of sludge received is large. There is a possibility that an event that makes it difficult to eject 32 occurs. Further, there is a possibility that the extraction nozzle tip 4a is buried in the accumulated sludge 22 and the surrounding sludge 22 is sucked when the fluidized sludge 33 is extracted.

  Hereinafter, an operation when the ejection nozzle tip 3a of the fluidizing liquid ejection tube 3 and the extraction nozzle tip 4a of the sludge extraction tube 4 are buried in the accumulated sludge 22 will be described. First, the steam 31 is supplied to the steam ejector 8c by the steam supply device 7c, the processing liquid 21 in the tank is sucked by the negative pressure generated in the steam ejector 8c, and the fluidizing liquid is discharged from the tip of the auxiliary fluidizing liquid jet pipe 9. 32 is sprayed onto the deposited sludge 22 to be fluidized as fluidized sludge 33.

  Further, the steam 31 is supplied to the steam ejector 8d by the steam supply device 7d, and the fluidized sludge 33 is extracted upward by the auxiliary sludge extraction pipe 10 by the negative pressure generated in the steam ejector 8d.

  After the tip of the fluidizing liquid ejection pipe 3 is exposed above the sedimentation sludge 22 by the extraction of the accumulated sludge 22 by the auxiliary fluidizing liquid ejection pipe 9 and the auxiliary sludge extraction pipe 10, the above-described fluidizing liquid ejection pipe 3 and The accumulated sludge 22 is extracted by the sludge extraction pipe 4.

(effect)
According to the third embodiment of the present invention, when the ejection nozzle tip 3 a and the extraction nozzle tip 4 a are buried in the accumulated sludge 22, the ejection nozzle tip 3 a and the extraction nozzle tip 4 a are exposed above the accumulated sludge 22. Can be returned to the optimal arrangement.

(Fourth embodiment)
(Constitution)
Hereinafter, a sludge extraction apparatus according to a fourth embodiment of the present invention will be described with reference to FIG. The same parts as those of the sludge extraction apparatus according to the first embodiment are denoted by the same reference numerals, and description of the same configuration is omitted.

  FIG. 4 is a schematic longitudinal sectional view of a sludge treatment apparatus according to the fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment in that a density meter 13 is newly provided. The density meter 13 has a plurality of density sensor tips 13a. For example, the density sensor tips 13a are installed at intervals of 50 mm from the lower end 2a of the sedimentation tank 2. The density sensor tip 13a bubbles a gas at a predetermined flow rate from the tip of a pipe having an inner diameter of about 5 mm, and the density meter 13 converts the pressure from the pressure difference of the gas supply source into a density.

(Function)
The operation of the fourth embodiment of the present invention will be described below. It is assumed that the density meter 13 stores in advance data on the density of the liquid medium of the treatment liquid 21, the density of the deposited sludge 22, and the density of the fluidized sludge 33. When the fluidizing liquid 32 is ejected from the fluidizing liquid ejection pipe 3, the density meter 13 calculates the density distribution in the vertical direction and monitors the fluidizing range of the fluidizing sludge 33 from the density data described above. Further, the upper surface height of the sludge deposition layer 22 before the fluidizing liquid 32 is ejected can also be calculated by measuring the density change in the vertical direction.

  In the above-described sludge extraction test, a slurry containing solid content was collected from the fluidization range, and the solid content concentration was measured to be about 10 to 30 wt%. Accordingly, the extraction nozzle tip 4a is arranged with the range of the treatment liquid 21 containing 10 to 30 wt% of the sludge as the range where the fluidized sludge 33 exists.

  Moreover, it is good also as a structure which provides the moving mechanism which moves the extraction nozzle front-end | tip 4a in the part which the depositing sludge 22 has fluidized using the monitoring result by the density meter 13. FIG. Furthermore, by using a monitoring result obtained by the density meter 13, by providing a moving mechanism for moving the ejection nozzle tip 3a in a portion where the accumulated sludge 22 is not fluidized, even when the properties (specific gravity, density) of the sludge to be received change. The accumulated sludge 22 can be efficiently extracted without causing blockage of piping or the like.

(effect)
According to the fourth embodiment of the present invention, the density of the accumulated sludge 22 and the fluidized sludge 33 is calculated by measuring the density in the vertical direction with the density meter 13, and the ejection nozzle tip 3a and the extraction nozzle tip 4a are calculated. Can be placed in an appropriate position.

(Fifth embodiment)
(Constitution)
Hereinafter, a sludge extraction apparatus according to a fifth embodiment of the present invention will be described with reference to FIG. The same parts as those of the sludge extraction apparatus according to the first embodiment are denoted by the same reference numerals, and description of the same configuration is omitted.

  FIG. 5 is a schematic longitudinal sectional view of a sludge treatment apparatus according to the fifth embodiment of the present invention. The fifth embodiment is different from the first embodiment in that a dosimeter 14 is newly provided. The dosimeter 14 is provided, for example, at a height of every 50 mm from the lower end 2a of the sedimentation separation tank 2 along the side peripheral surface 2b.

(Function)
The operation of the fifth embodiment of the present invention will be described below. When the sludge treatment apparatus 1 is applied to a nuclear facility, radioactive material is contained in the sludge. It is assumed that the dosimeter 14 stores in advance data on the radiation dose of the liquid medium of the treatment liquid 21, the radiation dose of the deposited sludge 22, and the radiation dose of the fluidized sludge 33.

  The fluidization range of the fluidized sludge 33 is monitored by measuring the change in the radiation dose in the vertical direction with the dosimeter 14. Furthermore, the upper surface height of the sludge deposition layer 22 before the fluidizing liquid 32 is ejected can also be calculated.

  Depending on the calculated fluidization range of the fluidized sludge 33, the ejection nozzle tip 3a and the extraction nozzle tip 4a are arranged at appropriate positions. Furthermore, the ejection flow rate of the fluidizing liquid 32 by the fluidizing fluid ejection pipe 3 and the extraction flow rate of the fluidized sludge 33 by the sludge extraction pipe 4 can be changed to appropriate flow rates.

(effect)
According to the fifth embodiment of the present invention, a plurality of dosimeters 14 are provided in the height direction, and the ranges of the accumulated sludge 22 and the fluidized sludge 33 are calculated by measuring the radiation dose in the height direction. The nozzle tip 3a and the extraction nozzle tip 4a can be arranged at appropriate positions.

  Needless to say, the embodiment of the present invention is not limited to the above-described embodiment. For example, the size of the sedimentation separation tank 2, the diameter and arrangement of the fluidizing liquid ejection pipe 3 and the sludge extraction pipe 4, the ejection water flow rate of the fluidizing liquid 32 in the fluidizing liquid ejection pipe 3, the sludge extraction pipe 4 The extraction flow rate of the fluidized sludge 33 can be appropriately changed according to the particle size and specific gravity of the deposited sludge, the volume of the treatment liquid 21 and the type of the liquid medium. Note that the first to fifth embodiments described above can be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Sludge processing apparatus 2 ... Sedimentation separation tank 2a ... Lower end part 2b ... Side peripheral surface 2c ... Bottom part 3 ... Fluidized liquid ejection pipe 3a ... Ejection nozzle tip 4 ..Sludge extraction pipe 4a ... extraction nozzle tip 5 ... fluidizing liquid ejection device 6 ... sludge transfer devices 7a, 7b, 7c, 7d ... steam supply devices 8a, 8b, 8c, 8d ... Steam ejector 9 ... Auxiliary fluidized liquid ejection pipe 9a ... Auxiliary ejection nozzle tip 10 ... Auxiliary sludge ejection pipe 10a ... Auxiliary ejection nozzle tip 11 ... Auxiliary fluidized liquid ejection Device 12 ... Auxiliary sludge transfer device 13 ... Density meter 14 ... Radiation dose rate meter 21 ... Processing liquid 22 ... Deposition sludge 31 ... Steam 32 ... Fluidizing liquid 33 ...・ Fluidized sludge

Claims (12)

A sedimentation separation tank that has a bottom part inclined at the lower end part and in which sludge contained in the treatment liquid is settled to form a sedimentation sludge;
A fluidizing liquid ejection pipe for disposing the tip of the ejection nozzle toward the lower end of the sedimentation separation tank, spraying a fluidizing liquid onto the deposited sludge, and fluidizing the sludge;
A sludge extraction pipe for extracting upward the fluidized sludge from the extraction nozzle tip ;
Auxiliary flow in which an auxiliary jet nozzle tip is disposed above the jet nozzle tip of the fluidizing liquid jet pipe
A mobilized liquid ejection pipe;
An auxiliary nozzle having an auxiliary extraction nozzle tip disposed above the extraction nozzle tip of the sludge extraction pipe.
With a ludge extraction tube,
Either the tip of the ejection nozzle of the fluidizing liquid ejection pipe or the tip of the extraction nozzle of the extraction pipe
When it is buried in the sediment sludge, it is sprayed by the auxiliary fluidizing liquid jet pipe,
The fluidized liquid ejected by extracting the sludge in the buried portion with the auxiliary extraction pipe
The tip of the ejection nozzle of the pipe and the tip of the extraction nozzle of the extraction pipe are placed on the accumulated sludge.
Sludge treatment apparatus according to claim Rukoto is separated from the surface. The height of the ejection nozzle tip of the fluidized liquid ejection pipe is set to 0 mm from the upper surface of the deposited sludge.
To 100mm,
The height of the tip of the extraction nozzle of the sludge extraction pipe is -50 from the height of the tip of the ejection nozzle.
The sludge treatment apparatus according to claim 1, wherein the sludge treatment apparatus has a thickness of mm to 50 mm. The jet nozzle tip of the fluidizing liquid jet pipe and the discharge nozzle tip of the sludge discharge pipe are respectively disposed on both sides of a perpendicular extending upward from the lower end of the sedimentation separation tank. The sludge treatment apparatus according to claim 1 or 2. The distances between the tip of the jet nozzle of the fluidizing liquid jet pipe and the tip of the discharge nozzle of the sludge discharge pipe from the lower end of the sedimentation tank to the vertical extending upward are made equal. The sludge treatment apparatus according to claim 3. The direction of the tip of the jet nozzle of the fluidizing liquid jet pipe is parallel to the tilt angle of the side peripheral surface from an angle tilted by 10 ° with respect to a perpendicular extending upward from the lower end of the bottom of the sedimentation tank. The sludge treatment apparatus according to claim 3 or 4, wherein the sludge treatment apparatus is an angle. The tip of the jet nozzle of the fluidizing liquid jet pipe is disposed on an axis extending vertically from the lower end of the sedimentation separation tank, and the tip of the drain nozzle of the sludge drain pipe is connected to the fluidizing liquid jet pipe. The sludge treatment apparatus according to claim 1, wherein the sludge treatment apparatus is disposed around a tip of the ejection nozzle. The auxiliary jet nozzle tip of the auxiliary fluidizing liquid jet pipe and the auxiliary sludge discharge pipe
The auxiliary extraction nozzle tip is 50 mm each of the ejection nozzle tip and the extraction nozzle tip.
The sludge treatment apparatus according to claim 1, wherein the sludge treatment apparatus is provided up to 100 mm above.  A density meter for measuring a vertical density change of the sedimentation tank;
Range of the sludge fluidized from the density change in the vertical direction measured by this densimeter
A range of the sludge in which the tip of the extraction nozzle of the sludge extraction pipe is fluidized
And a mechanism for moving to the position of any one of claims 1 to 7.
The sludge treatment apparatus as described.  A dosimeter for measuring a change in radiation dose in the vertical direction of the settling tank;
Range of the sludge fluidized from the radiation dose in the vertical direction measured by this dosimeter
A range of the sludge in which the tip of the extraction nozzle of the sludge extraction pipe is fluidized
And a mechanism for moving to the position of any one of claims 1 to 8.
The sludge treatment apparatus as described.  The fluidizing liquid was used by recovering the supernatant liquid in which the sludge settled out of the processing liquid.
The sludge treatment apparatus according to any one of claims 1 to 9, wherein the sludge treatment apparatus is a thing.
Place. The ejection pipe and the extraction pipe take advantage of the fluid flow or internal negative pressure due to fluid condensation.
11. The transfer means according to claim 1, wherein the transfer means is used.
Sludge treatment equipment.  A sludge treatment method using the sludge treatment apparatus according to claim 1,
Settling the sludge in the settling tank;
A fluidizing liquid ejecting step of spraying a fluidizing liquid toward the lower end of the sedimentation tank;
A sludge extraction step of extracting the fluidized sludge upward;
Either the tip of the ejection nozzle of the fluidizing liquid ejection pipe or the tip of the extraction nozzle of the extraction pipe
When it is buried in the sediment sludge, it is sprayed by the auxiliary fluidizing liquid jet pipe,
The fluidized liquid ejected by extracting the sludge in the buried portion with the auxiliary extraction pipe
The tip of the ejection nozzle of the pipe and the tip of the extraction nozzle of the extraction pipe are placed on the accumulated sludge.
And a step of separating from the surface.

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