JP2005007371A - Muddy water treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a muddy water treatment apparatus extending retention time of continuously supplied muddy water in an agitation tank without increasing the size of the tank, thereby obtaining a high agitation mixing efficiency. <P>SOLUTION: This muddy water treatment apparatus is provided with the agitation tank 10 in which an agitation shaft 15 is rotatably provided in an axial direction in a horizontally disposed water tank 11, a coagulant is supplied to the muddy water continuously supplied from one side of the water tank 11, and the muddy water and the coagulant are agitated and mixed by the agitation shaft 15 and discharged from the other side of the water tank 11 ; and a settling tank 30 of cascade structure composed of multiple settling chambers under the agitation tank 10. The muddy water continuously discharged from the agitation tank 10 falling down through a duct 20 is supplied to a settling chamber 31 at one end, and supernatant is discharged to the outside from a settling chamber 35 at the other end. The agitation shaft 15 has reverse flow agitation blades 19 generating a reverse flow against the flow of the muddy water supplied continuously, delaying the muddy water flow from one side of the shaft 15 toward the other side, thereby extending agitation time of the muddy water and the coagulant in the agitation tank 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a muddy water treatment machine for removing suspended substances from muddy water such as construction wastewater.
[0002]
[Prior art]
Conventionally, as a purification method for discharging polluted water generated at a construction site and washing water generated at a crushing site to a river, there is a method of precipitating soil particles with a flocculant and discharging separated supernatant.
[0003]
As a conventional method for mixing / stirring and precipitating the flocculant, a stirrer is set in a stirring tank, and the stirred turbid water is overflowed from the stirring tank and sent to the precipitation tank, where it is separated in the precipitation tank. .
[0004]
For example, in Patent Document 1, the first agitation tank into which the polluted water is fed and the flocculant is charged is separated from the first agitation tank by a partition wall whose upper end is released, and overflows from the first agitation tank. It has disclosed about the structure which has a 2nd stirring tank into which polluted water is sent, and is provided with the stirring blade in each of this 1st and 2nd stirring tank.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-347103
[Problems to be solved by the invention]
However, in the conventional method, the stirring efficiency is low, and it is necessary to make the stirring tank very large in order to increase the processing capacity.
[0007]
In the configuration disclosed in Patent Document 1, a plurality of stirring tanks and a plurality of stirring blades and motors for driving the stirring blades must be provided. This increases the size of the apparatus and the number of parts. In addition, since the flow of the polluted water in the stirring tank is formed by one stirring blade, the flow direction is relatively simple and it is difficult to perform sufficient stirring, and the flow direction formed by the stirring blade is It becomes one direction and it is difficult to retain polluted water for a long time in the stirring tank.
[0008]
The present invention was made in order to solve the above-described conventional problems, and without increasing the size of the stirring section, the turbid water treatment in which the turbid water stays longer in the stirring section and the stirring and mixing efficiency can be increased. The purpose is to provide a machine.
[0009]
[Means for Solving the Problems]
According to a first aspect of the present invention, as described in claim 1, a stirring shaft is rotatably provided along an axial direction in a water tank formed in a cylindrical shape, and turbid water continuously supplied from one of the water tanks is provided. A stirring tank for supplying a flocculant, stirring and mixing the turbid water and the flocculant with the stirring shaft, and continuously discharging the other from the other of the water tanks; A turbid water continuously discharged from the agitation tank to the settling chamber at one end, and a settling tank for discharging the supernatant from the settling chamber at the other end to the outside of the tank. , Having a reverse stirring blade for generating a flow in the opposite direction to the flow of turbid water supplied continuously, slowing the flow of turbid water flowing from one side of the stirring shaft to the other, and in the stirring tank The turbid water treatment machine is characterized in that the stirring time of the turbid water and the flocculant is lengthened.
[0010]
According to a second aspect of the present invention, as described in the second aspect, in the first aspect described above, the stirring shaft is provided with a screw portion that regulates a flow rate of turbid water corresponding to the turbid water supply portion, and The counterflow agitating blade is provided on the downstream side of the screw part, and the flocculant is introduced corresponding to the part immediately downstream of the screw part.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to FIGS. In addition, the illustration in this Embodiment does not limit this invention.
[0012]
FIG. 1 is a cross-sectional view of an embodiment of a muddy water treatment machine according to the present embodiment. 2 is a top view of the apparatus, FIG. 3 is a left side view of the apparatus, and FIG. 4 is a right side view of the apparatus.
[0013]
In FIG. 1, the turbid water treatment machine 1 includes a stirring tank 10 that mixes the supplied turbid water and a flocculant, and a stirring treatment water dropping duct 20 that discharges the agitated turbid water from the flocculant in the stirring tank 10. And a sedimentation tank 30 that is disposed below the agitation tank 10 and retains a certain amount of turbid water that is fed from the agitation treatment duct 20 and precipitates suspended substances in the turbid water.
[0014]
The flow of muddy water in the muddy water treatment machine 1 is the direction A from the left side in the drawing in the stirring tank 10, the direction B from the top to the bottom in the drawing in the stirring treatment water dropping duct 20, and the left side from the right side in the drawing in the precipitation tank 30. Let the direction be the C direction.
(Stirring tank)
The agitation tank 10 has a water tank part 11 formed in a cylindrical shape and having a certain length in a substantially horizontal state, and a stirring shaft 15 is mounted in the cylindrical water tank part 11 so as to be rotatable in the horizontal direction. . Further, a muddy water supply unit 12 to which a muddy water supply pipe 12 a is connected is provided at the upper part on one end side of the water tank unit 11, and the other end of the water tank unit 11 is agitated as a discharge port above the water tank unit 11. A treated water outlet portion 13 is provided. Then, the agitation treated water dropping duct 20 is attached to the agitation treated water outlet part 13, and the agitated muddy water overflowing from the agitation treated water outlet part 13 falls downward.
[0015]
In the water tank unit 11, the agitation treatment water is dropped near the muddy water supply unit 12, and a flocculant inlet 14 is formed on the duct 20 side. Is continuously fed into the water tank 11.
[0016]
In the agitation tank 10, turbid water is continuously dropped from the turbid water supply part 12 to the water tank part 11, and the turbid water that has been agitated with the flocculant is discharged from the agitation water outlet part 13 on the opposite side. The flow is generally in the direction A in the figure.
[0017]
Further, since the agitation water outlet 13 is formed at the upper part of the downstream side surface of the water tank 11, the liquid level of the turbid water in the water tank 11 is maintained up to the position of the agitation water outlet 13.
[0018]
The stirring shaft 15 disposed in the water tank unit 11 along the horizontal direction has a rotation axis at the axial center position of the water tank unit 11, and a timing with the motor 16 with a deceleration function attached to the upper part of the settling tank 30. It is connected via a belt or the like and is driven to rotate.
[0019]
The stirring shaft 15 is provided with a feed screw portion 17 corresponding to the muddy water supply portion 12 on the rotating shaft portion 15a. The feed screw unit 17 stirs the turbid water supplied from the turbid water supply unit 12 to make the suspended substances in the turbid water homogeneous, while the pitch angle of the feed screw unit 17 feeds the turbid water slightly downstream or almost. It has a structure close to 0 °, and has a function of clogging the turbid water just supplied so that it does not move rapidly downstream. For this reason, the muddy water just supplied is gradually moved downstream by the feed screw portion 17.
[0020]
Nothing is provided in the shaft portion 15a in the portion immediately downstream of the feed screw portion 17, but the flocculant inlet 14 is disposed above this portion, and an appropriate amount of the flocculant is charged therefrom. At this time, the turbid water below the flocculant inlet 14 is moving from the feed screw portion 17 at a slow flow rate, so that the flocculant and the turbid water are efficiently mixed. In the present embodiment, since the flocculant and turbid water are efficiently diffused and mixed, the flocculant can be used regardless of the type of liquid or solid.
[0021]
In addition, a flocculant is provided for the liquid flocculant and a load cell is attached for the solid flocculant so that the flocculant is introduced in accordance with the flow rate of the turbid water by the flocculant quantitative introduction device provided at the flocculant inlet 14. A hopper is provided. The amount of flocculant charged is adjusted according to the amount of turbid water supplied.
[0022]
A plurality of paddles (first stirring blades) 18 are provided on the shaft portion 15 a of the stirring shaft 15 at an appropriate interval downstream from a position corresponding to the lower side of the flocculant inlet 14. Yes. Each of these paddles 18 is provided with a wing portion with a pitch angle of 0 ° (parallel to the axial direction) with respect to the axial direction of the shaft portion 15a. In the present embodiment, three paddles 18 are provided at equal intervals. Since the shaft portion 15 a of the stirring shaft 15 is on the same axis as the central axis of the water tank portion 11, when the tip of the wing portion is extended to a position close to the inner wall of the water tank portion 11, the turbid water in the water tank portion 11 is circled. It can be stirred efficiently over the entire direction. In addition, the said wing | blade part can also be set as the pitch of the direction sent to a downstream with respect to the axial direction of the axial part 15a so that muddy water may be sent a little downstream.
[0023]
Further, the shaft portion 15a of the stirring shaft 15 is provided with a plurality of stirring blades (second stirring blades) 19 with an appropriate interval downstream from the position corresponding to the flocculant inlet 14; In the present embodiment, two stirring blades 19 are provided so as to alternate with the paddle 18.
[0024]
In the present embodiment, these stirring blades 19 each have a pitch angle in a direction in which muddy water is moved toward the axial upstream side (feed screw portion 17) of the shaft portion 15a. The diameter of the agitating blade 19 is made short so that a small water flow is generated.
[0025]
Therefore, the turbid water flowing downstream from the feed screw portion 17 flows in the direction A in the figure toward the agitation water discharge portion 13 as a whole, but the flow rate of turbid water toward the downstream side by these agitating blades 19 is lower. The reaction time between the flocculant and turbid water is increased by controlling so that the mixing efficiency of the flocculant is increased, and convection is generated in the reverse flow to further agitate the flocculant and turbid water. I am letting.
[0026]
In other words, the action of the stirring blade 19 causes the turbid water that has flowed downstream at one end to be returned to the upstream side again, so that the residence time of the turbid water in the stirring tank 10 becomes longer. Moreover, since the flow of muddy water has various directions, the suspended matter and the flocculant in muddy water have a homogeneous distribution. Thus, the turbid water and the flocculant can be efficiently mixed in the stirring tank 10.
[0027]
Further, since the paddles 18 and the stirring blades 19 are alternately arranged along the axial direction, various muddy water flows are generated more efficiently in the water tank section 11.
[0028]
Further, since the paddle 18 and the agitating blade 19 are provided on the same shaft portion 15a, such agitation can be performed with one driving force, and the apparatus is downsized and the number of parts is reduced.
[0029]
Moreover, since the muddy water does not flow in the direction A in the figure while the muddy water is not supplied to the water tank unit 11, the muddy water flows in one direction and the agitation may not be sufficiently performed. However, in this embodiment, since the turbid water is caused to flow backward in the upstream direction by the stirring blade 19, the turbid water is efficiently stirred even during standby.
[0030]
In this way, the muddy water is sufficiently mixed with the flocculant while moving from one end side to the other end side of the water tank unit 11 by the paddle 18 and the stirring blade 19, and the stirring located at the upper portion on the other end side. The water is continuously discharged from the treated water outlet 13 and supplied to the lower sedimentation tank 30 through the stirring treated water dropping duct 20.
(Agitated water drain duct)
The lower end of the agitation treatment water dropping duct 20 is inserted into the settling tank 30 at the other end of the settling tank 30.
[0031]
The agitation treatment water dropping ducts 20 are alternately arranged in the duct main body 21 such that a plurality of cascade members 21 are overlapped at the top and bottom in the vertical direction and mixed with the flocculant discharged from the agitation tank 10. The muddy water doesn't fall suddenly. For this reason, when turbid water drops from the duct 20 to the settling tank 30 violently, the inside of the settling tank 30 is agitated to prevent the floating substance accumulated at the bottom from diffusing, and the sediment in the settling tank 30 is floated again. I try not to. According to such a configuration, the sedimentation time in the sedimentation tank 30 can be shortened.
(Settling tank)
The settling tank 30 has a first settling chamber 31, a second settling chamber 32, a third settling chamber 33, a fourth settling chamber 34, and a fifth settling chamber 35 in a direction C in the figure by a plurality of partition walls. Have been separated.
[0032]
The turbid water supplied to the settling tank 30 from the stirring treatment water dropping duct 20 is provided at the upper part of the side surface of the fifth settling chamber 35 while being gently flown from the first settling chamber 31 to the fifth settling chamber 35. Then, it is discharged from the supernatant liquid discharge portion 36.
[0033]
The first sedimentation chamber 31 is divided by a partition wall 31a erected from the bottom surface of the sedimentation tank 30 to a substantially middle portion of the water level. The upper part of the partition wall 31a is inclined inward of the first sedimentation chamber 31, thereby preventing floating substances and sediments from flowing from the first sedimentation chamber 31 into the second sedimentation chamber 32. In addition, a partition wall 31b is provided between the stirring treatment water dropping duct 20 and the first sedimentation chamber 31, and above the sedimentation chamber 31 due to turbulent water convection generated by dropping of turbid flow at the lower part of the stirring treatment water dropping duct 20. The sedimentation effect is enhanced by preventing sediments from flying up.
[0034]
The second sedimentation chamber 32 that follows the first sedimentation chamber 31 is divided by a partition wall 32 a that stands from the bottom surface of the sedimentation tank 30 to approximately the middle of the height of the sedimentation tank 30. The partition wall 32 a is provided with a slight inclination inward of the second sedimentation chamber 32, and its upper end is curved in a substantially inverted U shape inward of the second sedimentation chamber 32. Further, the second sedimentation chamber 32 is provided with a partition wall 32b which is inclined downward from the top plate portion of the sedimentation tank 30 and is inclined downstream, and a tip portion thereof is curved in a substantially U shape upstream. Projection plates 32a 'and 32b' formed in a plate shape are provided on the upstream wall surfaces of the partition walls 32a and 32b, respectively. Then, the protruding plate 32a ′ suppresses the rising of the precipitate, and the protruding plate 32b ′ suppresses the occurrence of convection in the second sedimentation chamber 32 by the supernatant liquid flowing from the first sedimentation chamber 31. The soaking of the sediment that has been precipitated is prevented.
[0035]
The third sedimentation chamber 33 following the second sedimentation chamber 32 is provided with a partition wall 33a erected substantially vertically from the bottom surface of the sedimentation tank 30 to the top plate. A substantially inverted U-shaped drop pipe 37 is provided between the adjacent fourth precipitation chamber 34 and the third precipitation chamber 33 at the upper portion of the partition wall 33a. A downward inlet portion 37 b that opens to the precipitation chamber 33 side is provided at a position lower than the liquid level of the third precipitation chamber 33. For this reason, only the supernatant liquid in the 3rd sedimentation chamber 33 can be poured into the 4th sedimentation chamber, without sucking the wooden piece etc. which floated on the liquid level of the 3rd sedimentation chamber 33.
[0036]
A shielding plate 37 is provided below the inlet 37b of the drop tube 37 so that water or the like on the bottom side of the third sedimentation chamber 33 is not directly sucked. Thus, in the third sedimentation chamber 33, the sedimentation process has progressed considerably, and the supernatant liquid has been considerably purified, so that the treated supernatant liquid, which is not contaminated as much as possible, is fed into the fourth sedimentation chamber 34. The drop tube 37 on the fourth settling chamber 34 side extends downward to the bottom along the shielding plate 37, and is discharged from the third settling chamber 33 discharged from the outlet 37 c of the drop tube 37. Convection is prevented from occurring in the fourth sedimentation chamber 34 by the supernatant liquid as much as possible, so that the supernatant liquid on the clarified upper surface is not affected.
[0037]
The fourth sedimentation chamber 34 immediately before the fifth sedimentation chamber, which is the final sedimentation chamber, is divided by a partition wall 34a inclined upstream from the bottom surface of the sedimentation tank 30 to a predetermined height. There is almost no suspended matter mixed, and a clean supernatant liquid is fed into the fifth sedimentation chamber 35 from the upper end of the partition wall 34a.
[0038]
A supernatant liquid discharge opening 36 is formed in the upper part of the downstream side wall surface of the fifth sedimentation chamber 35, and the supernatant liquid discharge opening 36 is positioned lower than the partition wall 34a. Thus, the treated water does not flow back to the fourth sedimentation chamber 34. And the supernatant liquid of the treated water in the 5th sedimentation chamber 35 is continuously discharged | emitted from the supernatant liquid discharge opening part 36 to a river etc. through the drain pipe not shown. The supernatant liquid thus discharged contains almost no suspended solids or precipitates and can be drained safely.
[0039]
On the other hand, in the first sedimentation chamber 31 which is the first sedimentation chamber, most of the suspended solids contained in the muddy water sent from the stirring-treated water drop duct 20 is precipitated and remains in the next second sedimentation chamber 32. It was found that most of the suspended solids were precipitated. This is probably because the turbid water and the flocculant were sufficiently mixed in the stirring tank 10 so that precipitation was performed more efficiently.
[0040]
Therefore, in the present embodiment, a screw conveyor 38 is provided at the bottom of the first sedimentation chamber 31 in order to remove the sediment 40 a that has settled at the bottom of the first sedimentation chamber 31. The screw conveyor 38 is provided with a screw shaft in a casing. A part of the casing is opened in the first sedimentation chamber 31, and the sediment is taken into the casing through the opening. The precipitate is transferred to one of the axial directions by the rotation of. A sediment discharge pipe is attached to the end of the sediment transfer side, and the precipitate is sent to a sediment treatment tank or the like through this sediment discharge pipe. The screw shaft of the screw 38 is rotationally driven by a screw motor 38a.
[0041]
Next, since the precipitate 40b generated in the second sedimentation chamber 32 is a small amount and most of the particles are small particles, a drain pipe (not shown) is attached to the bottom of the second sedimentation chamber. The drain cock may be opened and extracted periodically and sent to the above-described sediment processing tank or the like.
[0042]
The muddy water treatment machine 1 of the present embodiment includes muddy water generated from a gravel / fracture plant, muddy water discharged from construction work such as a dam / tunnel, muddy water generated from civil engineering / construction work, dyeing / food / chemicals.・ It can be applied to the treatment of turbid water discharged from fish farms.
[0043]
【The invention's effect】
As described above, according to the present invention, without increasing the size of the stirring tank, the residence time of the muddy water continuously supplied into the stirring tank can be increased, and the stirring and mixing efficiency can be increased. Water can be discharged.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a muddy water treatment machine according to an embodiment of the present invention.
2 is a top view of the muddy water treatment machine of FIG. 1. FIG.
FIG. 3 is a left side view of the muddy water treatment machine of FIG.
FIG. 4 is a right side view of the muddy water treatment machine of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Turbid water treatment machine 10 ... Stirring tank 11 ... Water tank part 12 ... Turbid water supply part 13 ... Stir processing water outlet part 14 ... Coagulant inlet 15 ... Stirring shaft 16 ... Motor 17 with a deceleration function ... Feed screw part 18 ... Paddle 19 ... Agitating blade 20 ... Draining water dropping duct 21 ... Cascade member 30 ... Sedimentation tank 31 ... First sedimentation chamber 31a, b ... Partition wall 32 ... Second sedimentation chamber 32a, b ... Partition wall 32a ', b' ... Projection plate 33 ... 3rd sedimentation chamber 33a, b ... partition wall 34 ... 4th sedimentation chamber 34a ... partition wall 35 ... 5th sedimentation chamber 36 ... supernatant liquid discharge part 37 ... dropping pipe 37a ... shielding plate 38 ... screw 38a ... screw Motors 40a, b ... precipitates

Claims (2)

A stirring shaft is rotatably provided along the axial direction in a water tank formed in a cylindrical shape, and a flocculant is supplied to muddy water continuously supplied from one of the water tanks. A stirring tank for stirring and mixing the flocculant and continuously discharging from the other of the water tanks;
Located in the lower part of the agitation tank, a plurality of sedimentation chambers are divided, the muddy water continuously discharged from the agitation tank is supplied to the sedimentation chamber at one end, and the supernatant liquid is discharged from the precipitation chamber at the other end to the outside of the tank A sedimentation tank,
Have
The stirring shaft has a reverse flow stirring blade that generates a flow in a reverse direction to the flow of turbid water continuously supplied, and slows the flow of turbid water flowing from one side of the stirring shaft to the other. A turbid water treatment machine characterized in that the stirring time of turbid water and a flocculant in a stirring tank is lengthened. The agitation shaft is provided with a screw part that regulates the flow rate of turbid water corresponding to the turbid water supply part, and is provided with the back-flow agitation blade on the downstream side of the screw part, immediately downstream of the screw part. 2. The muddy water treatment machine according to claim 1, wherein the flocculant is introduced corresponding to a portion on the side.

Images