JP2014161823A - Purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a purifier capable of improving a coagulation-precipitation speed in sludge of a raw water column, and capable of easily and safely executing coagulant input work.SOLUTION: Coagulant powder is inputted, mixed and agitated in raw water introduced to a first agitator 20 from a raw water pond 300 by a coagulant input machine 10. The raw water agitated by the first agitator 20 is temporarily stored in a pumping-up tank 40, and then, is pumped up and agitated again up to a second agitator 30 provided in a high position from the coagulant input machine 10 by a lifting pump P2 provided in the pumping-up tank 40 via a lifting pipe 32, and is introduced to a first precipitation filtration tank 50 by free-fall.

Description

  The present invention relates to a purification device, and more particularly to a purification device that agglomerates and precipitates sludge in raw water using a flocculant powder.

  In recent years, purification apparatuses have been developed that purify raw water by agglomerating and precipitating sludge in raw water by adding and stirring zeolite-based flocculant powder into raw water.

  This type of purification device is disclosed in Patent Document 1. This purifier includes a flocculant charging machine capable of continuously adding flocculant powder, a first stirrer that stirs the raw water charged with the flocculant powder by vortex, and the raw water stirred by the first stirrer. The second stirrer that is dropped by a plurality of stirrers provided alternately on the inner wall and collides with the inner wall, and the raw water stirred by the second stirrer flows down, and the sludge in the raw water It is composed of a settling tank for precipitating. According to this purification device, since the flocculant powder is continuously dropped into the raw water and the sludge is precipitated after stirring with two stirrers, the sludge agglomeration / precipitation rate can be improved.

  In this case, since the raw water is stirred while dropping in the path of the first stirrer → second stirrer → sedimentation tank, the flocculant charging machine is located at the highest upstream position in the apparatus, that is, above the first stirrer. It was attached.

JP 2004-098048 A

  However, since the flocculant charging machine is provided at the highest position in the purification device of Patent Document 1, there is a problem that the operation of storing the flocculant powder in the storage part of the flocculant charging machine is dangerous.

  Further, when the sludge aggregated and settled in the sedimentation tank is discharged, the sludge contains a large amount of water, which is inconvenient for transportation and disposal.

  In view of the above-described problems, the present invention provides a flocculant charging machine capable of continuously charging flocculant powder in a purification apparatus for purifying the raw water pond by removing sludge in the raw water pond, A stirring vessel and a raw water introduction pipe which is joined to the side wall of the first stirring vessel and introduces the raw water introduced from the raw water pond into the first stirring vessel so as to form a vortex. A first stirrer that stirs the raw water introduced through the raw water introduction pipe and into which the flocculant powder is charged by the flocculant charging machine, and a pumping tank that temporarily stores the raw water discharged from the first stirrer And a second agitation vessel provided at a position higher than the flocculant charging machine, and a plurality of agitation plates provided alternately on the opposing inner walls of the second agitation vessel, Dropped raw water through the plurality of stirring plates A second agitator for stirring by impinging on a wall, characterized in that it comprises a sedimentation filter tank to precipitate filtered agitated raw water sludge by the second agitator.

  According to the purification apparatus of the present invention, the raw water mixed with the flocculant powder is agitated by two agitators, and is agglomerated and precipitated as sludge. Is provided at a position lower than that of the second stirrer, so that the flocculant charging operation can be performed easily and safely as compared with the conventional case. Moreover, transportation and disposal processing can be performed smoothly by providing a dehydrator for dewatering sludge.

  In particular, the purification device of the present invention is capable of removing sludge containing radioactive cesium from the raw water pond and greatly reducing the concentration of radioactive cesium in the raw water. can do.

It is a whole block diagram of the purification apparatus in embodiment of this invention. It is a top view of a flocculant charging machine and a 1st stirrer. It is sectional drawing in the AA of FIG. It is sectional drawing in the BB line of FIG. It is sectional drawing of a 2nd stirrer and a precipitation filtration tank. It is a perspective view which shows the structure of a dehydrator. It is sectional drawing which shows operation | movement of a dehydrator. It is a perspective view which shows the structure of a sludge conveyor. It is a figure which shows the structure of a raw water stirrer.

<Overall configuration of purification device 200>
FIG. 1 is an overall configuration diagram of a purification device 200 according to an embodiment of the present invention. The purification device 200 is a purification device that purifies the raw water pond 300 by removing sludge in the raw water of the raw water pond 300 that stores the raw water, and is a flocculant capable of continuously adding zeolite-based flocculant powder. The feeder 10, the first stirrer 20 that stirs the raw water on which the flocculant powder has been dropped by vortex, the second stirrer 30 that performs re-stirring by collision with the inner wall, and the raw water that has been stirred by the first stirrer 20 temporarily A pumping tank 40 to be stored, a first precipitation filtration tank 50 that performs two-stage precipitation filtration, and a second precipitation filtration layer 60 are included.

  The purification apparatus 200 further includes a sludge tank 70 for temporarily storing sludge precipitated in the first sedimentation filtration tank 50, a sludge conveyor 80 for conveying sludge from the sludge tank 70 to a dehydrator 90, a dehydrator 90 for dewatering sludge, And a raw water agitator 110 provided in the raw water basin 300. The raw water pond 300 includes a pool, a pond, a fire prevention water tank and the like.

  The raw water introduced from the raw water basin 300 to the first stirrer 20 is dropped with the flocculant powder by the flocculant charging machine 10 and mixed and stirred. The raw water stirred by the first stirrer 20 is temporarily stored in the pumping tank 40, and then from the flocculant charging machine 10 by the pumping pump P <b> 2 provided in the pumping tank 40 through the pumping pipe 32. The second stirrer 30 provided at a high position is pumped up and re-stirred, and is introduced into the first precipitation filtration tank 50 by natural fall.

  Accordingly, the sludge is aggregated and precipitated by stirring the raw water mixed with the flocculant powder with the two agitators 20 and 30 of the first and second agitators, thereby improving the agglomeration / sedimentation rate of the sludge. In addition, since the entire flocculant charging machine 10 is provided at a position lower than the second stirrer 30, manual flocculant charging work can be performed easily and safely.

Hereinafter, the configuration of each element of the purification device 200 will be described in detail.
<Configuration of flocculant charging machine 10 and first stirrer 20>
FIG. 2 is a plan view of the flocculant charging machine 10 and the first stirrer 20. 3 is a cross-sectional view taken along line AA in FIG. 4 is a cross-sectional view taken along line BB in FIG.

  At the bottom of the mortar-shaped flocculant powder storage part 11 of the flocculant charging machine 10, a stirring member 12 made of an octagonal column is provided. The stirring member 12 is not limited to an octagonal column, but may be a hexagonal column, a dodecagonal column, or a polygonal column, but an octagonal column is suitable for stirring according to the experiments of the inventors.

  The flocculant powder 100 is charged from above the flocculant powder storage unit 11. A flocculant powder dropping hole 13 is opened at the bottom of the flocculant powder storage portion 11, and the flocculant powder is continuously placed below the flocculant powder dropping hole 13 as the stirring member 12 rotates. The first stirrer 20 is charged. The stirring member 12 is attached to the rotating shaft 14, and a plurality of stirring pieces 15 are further attached to the rotating shaft 14. The stirring piece 15 is suitably L-shaped or loop-shaped. By rotating the stirring member 12 and the stirring piece 15, the flocculant powder housed in the bottom is stirred, so that a problem that a so-called bridge occurs and the flocculant powder 100 cannot be continuously dropped is prevented. The

  The rotating shaft 14 is taken out through a guide tube 16 provided on the side surface of the flocculant powder storage unit 11, and is rotated by attaching a rotating shaft of a motor to the end thereof or by attaching a manual handle. .

The first stirrer 20 is joined to the cylindrical first stirring vessel 21 and the cylindrical side wall of the first stirring vessel 21 so that raw water is introduced from the direction along the circumference of the first stirring vessel 21. The raw water introduction pipe 22 is provided. A dropping port 23 is formed in the upper wall of the first stirring vessel 21, and the flocculant powder 100 is dropped into the first stirring vessel 21 through the dropping port 23 from the flocculant powder dropping hole 13. It is like that. As a result, the raw water into which the flocculant powder 100 has been dropped is efficiently stirred as a vortex in the first stirring vessel 21,
Sludge in raw water is agglomerated. The stirred raw water is discharged through a pipe 24 connected to the bottom of the first stirring vessel 21 and introduced into a pumping tank 40.

<Configuration of second agitator 30 and precipitation filtration tank>
FIG. 5 is a cross-sectional view of the second agitator 30, the first precipitation filtration tank 50, and the second precipitation filtration tank 60. The raw water in the pumping tank 40 is pumped and re-stirred by the pumping pump 32 through the pumping pipe 32 to the second stirrer 30 provided at a position higher than the flocculant charging machine 10, and the first sedimentation filtration tank is caused by natural fall. 50 is introduced.

  The second stirrer 30 has a rectangular parallelepiped second stirring vessel 31 and, for example, four stirring plates 33a to 33d provided alternately on the opposing inner walls of the second stirring vessel 31, and pumped water. The raw water is stirred by dropping it through the stirring plates 33a to 33d and colliding with the inner wall. In this case, the stirring plate 23 is attached to the inner wall of the second stirring vessel 31 so as to be inclined obliquely downward. Accordingly, the raw water is accelerated through the stirring plates 33a to 33d and repeatedly hits the inner wall of the second stirring container 31. Thereby, stirring is performed more efficiently. The stirred raw water is introduced into the first precipitation filtration tank 50 through the discharge port 34 formed at the bottom of the second stirring vessel 31. The number of the stirring plates 33a to 33d is not limited to four, and can be appropriately increased or decreased according to the processing capability of the purification device 200.

  The first sedimentation filtration tank 50 is partitioned by a partition wall 51 extending from the upper wall to the upper part of the bottom, and the water dropped from the second stirrer 30 into the first filtration tank 50 wraps around the partition wall 51. Thus, the filter layer 52 provided in the space on the left side of the partition wall 51 passes from the bottom to the top. As a result, the raw water is filtered by the filtration layer 52, and the sludge 53 contained in the raw water is precipitated at the bottom of the first filtration tank 50. The precipitated sludge 53 is sent to a sludge tank 70 through a sludge pipe 54 connected to the bottom of the first filtration tank 50. Sludge 53 is stored in the bottom 71 of the sludge tank 70, but the supernatant water is returned to the pumped tank 40 through the pipe 72.

  In this case, the precipitated sludge is sent to the sludge tank 70 in normal operation, but if the sludge pump P3 is provided in the bypass water pipe of the sludge pipe 54 in consideration of the case where the amount of sludge is large, this sludge pump P is used. The sludge can be forcibly sent to the sludge tank 70 by operating.

  The filtration layer 52 is composed of a layer of filtration material, and for example, a layer obtained by laminating particles having a large number of irregularities on the surface, such as finely crushed volcanic stone, to a predetermined thickness is suitable. The thickness is, for example, about 20 cm. A part of the sludge in the raw water is taken into the filtration layer 52, whereby the first stage filtration is performed. The raw water that has passed through the filtration layer 52 overflows from the discharge port 55 and is introduced into the adjacent second precipitation filtration tank 60 through the connecting pipe 56.

  The second precipitation filtration tank 60 can adopt the same configuration as the first precipitation filtration tank 50, but here, in order to enhance the filtration function, the first and second filtration layers 61 and 62 are two-stage. The filtration layer is used. The first partition 63 extends from the bottom of the second sedimentation filtration tank 60 to below the upper wall, and the second partition 64 extends from the top wall of the second precipitation filtration tank 60 to above the bottom. As a result, the raw water introduced through the connecting pipe 56 connected to the side wall of the second sedimentation filtration tank 60 first passes through the first filtration layer 61 from the top to the top, overflows, and passes through the second partition wall 64. From above and through the second filtration layer 62 from above to below. The raw water purified through the second filtration layer 62 is returned to the raw water basin 300 through the reflux pipe 65.

  In this case, since the sludge 53 settles to some extent also on the bottom of the second sedimentation filtration tank 60, it is possible to form an annular flow path for circulation to the first sedimentation filtration tank 50 via the pipe 66 and the pump P4. preferable. As a result, most of the sludge 53 can be precipitated in the first precipitation filtration tank 50.

<Configuration of dehydrator 90>
FIG. 6 is a perspective view showing the configuration of the dehydrator 90. FIG. 7 is a cross-sectional view showing the operation of the dehydrator 90. A support bar 92 is attached to the bottom surface of the support base 91, and a dehydration lid 94 having a plurality of dehydration holes 93 formed at the tip thereof. A drain pipe 96 is connected to the side surface of the outer shell cylinder 95 and is placed on a base 97 that is movable in the vertical direction. The dehydrating cylinder 98 can be stored in the outer shell cylinder 95, and a plurality of dewatering holes 99 are provided so that the dehydrating lid 94 can be fitted vertically from the upper end thereof.

  Then, the sludge 53 is carried into the dewatering cylinder 98 from the sludge conveyor 80, and the sludge is compressed in the vertical direction by the dewatering lid 94 by the upward movement of the base 95, so that the moisture of the sludge 53 is discharged from the drain pipe 96. It is configured to be. The water discharged from the drain pipe 96 is preferably returned to the raw water basin 300 through the drain pipe 96. Since the dewatered and powdered sludge 53 is small and light, it is suitable for transporting in a bag or the like, and is taken out from the dewatering cylinder 97 and transported to a disposal place or temporary storage place.

<Configuration of sludge conveyor 80>
FIG. 8 is a perspective view showing the configuration of the sludge conveyor 80. The sludge conveyor 80 is attached to the rotary shaft 81, the rotary shaft 81, and houses the screw 82 attached to the rotary shaft and these members so that sludge is sent in the direction of the rotary shaft by the rotation of the rotary shaft 81. An elongated cylindrical storage case 83 is provided. A sludge injection portion 84 is provided at one end of the storage case 83 so that the sludge from the sludge tank 70 is injected through the sludge injection portion 84. The rotation shaft 81 is controlled to rotate at a predetermined speed by a motor. The injected sludge is sent out by the rotation of the rotary shaft 81, discharged from the sludge discharge section 85 at the other end, and supplied to the dehydrator 90.

<Configuration of raw water agitator 110>
FIG. 9 is a diagram illustrating a configuration of the raw water agitator 110. The raw water agitator 110 is provided in the raw water pond 300 and has a hollow raw water jet body 112 having a plurality of raw water jet holes 111 at the bottom, and the raw water from the raw water pond 300 is injected into the raw water jet body 112 through the raw water injection pipe 113. The raw water injection pump P4 that ejects raw water from the raw water ejection hole 111 toward the bottom of the raw water pond 300, and floats 114a and 114b for floating the raw water ejection body 112 to a predetermined depth of the raw water pond 300 are included. It consists of

  The raw water ejection body 112 has a form such as a hollow quadrangular column or a hollow ring, and floats 114a and 114b are connected to the upper surface of the raw water ejection body 112 via wires 115a and 115b. The raw water ejection body 112 floats to a predetermined depth in the raw water basin 300 by the buoyancy of the floats 114a and 114b.

  The raw water agitator 110 agitates the sludge accumulated at the bottom of the raw water pond 300 and mixes it with the raw water. The raw water pond 300 is provided with a raw water supply pump P1 adjacent to the raw water agitator 110 or integrated with the raw water agitator 110, and the raw water mixed with sludge is supplied to the raw water through the raw water introduction pipe 22. It is supplied to the first stirrer 20 by the pump P1. In this way, purification of the raw water pond 300 can be promoted.

  The purification device 200 of the present embodiment can be widely applied to the purification of the raw water pond 300 such as a pool, a pond, a fire prevention water tank, etc. In particular, when sludge containing radioactive cesium is accumulated in the raw water pond 300, Experiments have confirmed that radioactive cesium concentration can be significantly reduced along with sludge.

  Moreover, the purification apparatus 200 can be loaded on a 4 to 10 ton truck according to the processing amount, and the purification process can be performed while the apparatus is loaded on the site without unloading the apparatus. Further, since the contaminated water in the raw water pond 300 can be purified while circulating without draining, the concentration of radioactive cesium in the raw water can be reduced without using a temporary storage tank for wastewater treatment.

DESCRIPTION OF SYMBOLS 10 Flocculant charging machine 11 Flocculant powder storage part 12 Stirring member 12 13 Flocculant powder dropping hole 14 Rotating shaft 15 Stirring piece 16 Guide tube
DESCRIPTION OF SYMBOLS 20 1st stirrer 21 1st stirring container 22 Raw water introduction pipe 23 Drop port 24 Piping 30 2nd stirrer 31 2nd stirring container 32 Pumping pipes 33a-33d Stirring plate 34 Discharge port 40 Pumping tank 50 1st precipitation Filtration tank 51 Bulkhead 52 Filtration layer 53 Sludge 54 Sludge pipe 55 Discharge port 56 Connection pipe 60 Second precipitation filtration layer 61 First filtration layer 62 Second filtration layer 63 First partition 64 Second partition 65 Reflow pipe 70 Sludge Tank 71 Bottom 72 Piping 80 Sludge Conveyor 81 Rotating Shaft 82 Screw 83 Storage Case 84 Sludge Injection Port 85 Sludge Discharge Port 90 Dehydrator 91 Support Base 92 Support Bar 93 Dehydration Hole 94 Dehydration Lid 95 Outer Shell Cylinder 96 Drain Pipe 97 Base Table 98 Dehydration cylinder 99 Dehydration hole 100 Flocculant powder 110 Raw water agitator 111 Raw water ejection hole 112 Raw water ejection body 113 Raw water injection pipe 114a 114b float 115a, 115b wires 200 purifier 300 raw water pond

Claims (7)

In a purification device that purifies the raw water pond by removing sludge in the raw water pond,
A flocculant feeding machine capable of continuously feeding the flocculant powder;
A first agitation vessel and a raw water introduction pipe which is joined to the side wall of the first agitation vessel and introduces the raw water introduced from the raw water pond into the first agitation vessel so as to form a vortex; A first stirrer that stirs the raw water introduced through the raw water introduction pipe and into which the flocculant powder is charged by the flocculant charging machine;
A pumping tank for temporarily storing raw water discharged from the first stirrer;
A second stirring vessel provided at a position higher than the flocculant charging machine and a plurality of stirring plates provided alternately on the opposing inner walls of the second stirring vessel were pumped from the pumping tank. A second stirrer that stirs by dropping raw water through the plurality of stirring plates and colliding with the inner wall;
A purification apparatus comprising: a precipitation filtration tank that precipitates and filters sludge in raw water stirred by the second stirrer.   The purification apparatus according to claim 1, further comprising a sludge tank that is connected to the sedimentation tank via a sludge pipe and stores sludge that has settled in the sedimentation tank. A sludge conveyor for carrying out sludge from the sludge tank;
The purification apparatus according to claim 2, further comprising: a dehydrator that dehydrates the sludge carried out by the sludge conveyor. The dehydrator is fixed at a certain height, and a dehydration lid formed with a plurality of dehydration holes;
A vertically movable base;
An outer shell tube placed on the base and having a drain pipe connected to the side surface;
A dewatering cylinder that can be accommodated in the outer shell cylinder and has a plurality of dewatering holes and in which the dewatering lid can be fitted vertically from the upper end, and sludge is carried into the dewatering cylinder from the sludge conveyor. The sludge is vertically compressed by the dehydrating lid by the upward movement of the base, so that the water in the sludge is discharged from the drain pipe. The purification device according to 1.   The said sludge conveyor is equipped with a rotating shaft and the screw provided so that sludge may be sent to a rotating shaft direction by rotation of this rotating shaft, The purification apparatus of Claim 3 or 4 characterized by the above-mentioned.   The purification apparatus according to any one of claims 1 to 5, further comprising a sludge delivery pump for sending the sludge precipitated in the settling tank to the sludge tank. A hollow raw water ejection body provided in the raw water pond and having a plurality of raw water ejection holes at the bottom, and by injecting raw water of the raw water pond into the raw water ejection body, from the raw water ejection hole to the bottom of the raw water pond A raw water agitator having a raw water injection pump for jetting raw water toward the float, and a float for floating the raw water jet body to a predetermined depth in the raw water pond;
The purification apparatus according to any one of claims 1 to 6, further comprising: a raw water supply pump for supplying raw water in the raw water pond to the first stirrer.

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