JP2008200584A - Muddy water treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a muddy water treatment apparatus which conducts the solid-liquid separation treatment efficiently with high accuracy after miniaturizing the whole of an apparatus. <P>SOLUTION: The muddy water treatment apparatus is provided with a precipitation tank 60 in the proximity of an agitation tank 20 wherein the precipitation tank 20 has a configuration in which a taper part 62 is annexed to the lower part of a cylinder part 61. A supply hose 65 withdrawn from the agitation tank 20 is piped along the outer peripheral surface of the cylinder part 61 and then arranged to the inner peripheral surface 61A of the cylinder part 61 in a posture that the distal end is penetrated through the peripheral wall and directed to the tangential direction. Floc-containing water produced at the agitation tank 20 flows through the supply hose 65 while enlarging the floc F. Then, the floc-containing water is discharged to the tangential direction against the inner peripheral surface 61A of the cylinder part 61 and flows along the inner peripheral surface 61A so that it may whirl. At this point, the floc F is avoided to be crushed by receiving the impact and rather it may become larger floc F by collecting the flocs F floating around. Resultingly, each floc F becomes heavy one so that it may be easy to precipitate and the solid-liquid separation is surely performed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus capable of separating and separating muddy water such as muddy water into separated water and solid matter.

Conventionally, what was described in patent document 1 is known as an example of this kind of muddy water processing apparatus. This is a structure in which a stirring tank provided with a stirrer and a flocculant supply machine, and a solid-liquid separation device in which a large number of elliptical rotating plates are arranged on the upper surface of the filtrate tank. When mud pumped up from a river or the like is supplied to the stirring tank, a floc is formed by adding the flocculant to the mud and stirring, and when a predetermined time has elapsed, the floc is formed on the bottom surface of the stirring tank. The floc mixed water mixed with the generated floc is supplied to the starting end side of the rotating plate row from the drain outlet, and the floc is received, and further solid-liquid separation while the floc is conveyed according to the rotating direction of the rotating plate As a result, flocs (solid matter) with a reduced water content are taken out at the terminal side of the rotating plate row, and so-called filtered fresh water is stored in the filtrate tank.
JP 2006-334518 A

However, in the above conventional one, since the floc is formed in a state where the muddy water is stored in the agitation tank for a predetermined time, the flock mixed water is also generated when the flock is clogged in the drain and the drain is opened. There was a case that could not flow down. In addition, since the floc is transported on the rotating plate train as a means of solid-liquid separation, the floc is pulverized by a considerable impact, falls into the filtrate tank, and mixes with fresh water. While the clarity is reduced, the amount of solids removed is reduced. In short, although the apparatus is large, there is a problem that the efficiency of solid-liquid separation is low, and the appearance of a new apparatus has been eagerly desired.
The present invention has been completed based on the above circumstances, and its purpose is to enable the solid-liquid separation process to be performed with high accuracy and efficiency after the entire apparatus is compactly assembled. By the way.

  As means for achieving the above object, the invention of claim 1 is characterized in that turbid water is sequentially supplied, and the flocculant is agitated with a stirrer while introducing the flocculant into the supplied turbid water from the flocculant feeder. And a settling tank that is supplied with floc-mixed water mixed with flocs generated in this stirrer tank and that separates the flocs by solid-liquid separation is provided. A vertically-oriented cylindrical shape with a tapered portion whose lower side is gradually reduced in diameter downward, and a flock discharge port that can be opened and closed at the lower end of the tapered portion is close to the upper end of the upper cylindrical portion And a supply pipe for the floc mixed water is drawn out from the agitation tank, and the supply pipe is arranged in a circumferential direction with respect to the outer peripheral surface of the cylindrical portion in the settling tank. Arrange along After it is, characterized in was a configuration in which the tip is disposed against the inner peripheral surface of the cylindrical portion in a posture facing substantially tangentially through the peripheral wall of the cylindrical portion.

According to a second aspect of the present invention, the supply pipe is a flexible hose according to the first aspect, while the floc-mixed water outflow pipe is provided in the stirring tank and the settling tank is provided with the An inflow pipe directed in a tangential direction with respect to the inner peripheral surface of the cylindrical portion is provided to project, and the hose is piped along the outer peripheral surface of the cylindrical portion of the settling tank, and one end and the other end of the inflow pipe are It is characterized in that it is connected to the outflow pipe and the inflow pipe.
The invention according to claim 3 is the one according to claim 2, wherein the agitation tank and the settling tank are installed close to each other, and the hose is connected to the agitation tank among the outer peripheral surfaces of the cylindrical portion of the settling tank. Is characterized in that it is piped along a non-opposing outer peripheral surface.

  According to a fourth aspect of the invention, there is provided the method according to any one of the first to third aspects, wherein the stirring tank is formed in a rectangular box-shaped tank body, and the partition plate floats from the inner bottom surface by a predetermined dimension. The first stirring chamber to which the turbid water is supplied is provided on one side of the partition plate, and the second stirring chamber which allows the floc-mixed water to flow out from the upper position. The flocculant feeder is provided in the first stirring chamber, and the stirrer is separately provided in the first stirring chamber and the second stirring chamber. And the stirring tool on the first stirring chamber side is characterized in that the stirring ability is set larger than that of the stirring tool on the second stirring chamber side.

According to a fifth aspect of the present invention, in the apparatus according to the fourth aspect, the stirring tool has a shape in which a plurality of stirring blades are provided on a longitudinal rotation shaft driven by a motor, and the first stirring is performed. The stirrer in the chamber is characterized in that it is arranged in a posture in which the rotation axis is inclined with respect to the vertical direction.
A sixth aspect of the present invention is the method according to the fourth or fifth aspect, wherein the agitator provided in the first agitating chamber is formed of a plurality of flat plates on a longitudinal rotating shaft driven by a motor. The stirring blade is provided with a shape, and the stirring blade is characterized in that a plurality of holes are opened in an irregular arrangement.
A seventh aspect of the present invention is the method according to any one of the fourth to sixth aspects, wherein a plurality of stirring tools provided in the second stirring chamber are provided on a vertical rotating shaft driven by a motor. It is characterized in that a single plate-like stirring blade is provided and a propeller portion that promotes an upward axial flow is formed at the lower end of each stirring blade.

<Invention of Claim 1>
In the agitation tank, flocs are formed by stirring while supplying the flocculant to the supplied turbid water, and the floc-mixed water mixed with the flocs circulated through a supply pipe piped around the precipitation tank. After that, it is discharged in a substantially tangential direction with respect to the inner peripheral surface of the cylindrical portion of the settling tank, and is supplied while flowing so as to spiral along the inner peripheral surface. After that, the flocs settle by gravity and are collected in the taper portion to be separated into solid and liquid, and the supernatant water is taken out from the drain on the upper end side. The accumulated floc is discharged to the outside by appropriately opening the discharge port.

In the above, while the floc-mixed water flows through the supply pipe, the small flocs gather to form a gradually larger floc. And when such floc-mixed water mixed with such a large floc is introduced into the sedimentation tank, it is discharged in a tangential direction with respect to the inner peripheral surface of the cylindrical portion, so that the impact is suppressed and the floc is crushed. Is avoided. After that, the floc mixed water flows in a vortex along the inner peripheral surface of the cylindrical part, but in addition to flowing smoothly without receiving an impact, the flocs in the same flow collect floating flocs around. And it becomes a bigger frock. As a result, since each floc is large and heavy, it becomes easy to settle without floating, and solid-liquid separation is more reliably performed. Therefore, it is possible to take out the supernatant water with a very small amount of impurities.
In addition, as described above, the longer the supply pipe that supplies floc-mixed water to the sedimentation tank, the larger the floc can be made, and this is advantageous for solid-liquid separation, but the supply pipe is provided on the outer peripheral surface of the cylindrical portion of the stirring tank. Piping space is kept small because it is piped along.
That is, the solid-liquid separation process can be performed with high accuracy and efficiency while keeping the entire apparatus compact.

<Invention of Claim 2>
Since the hose can be removed from both tanks, the inside of the hose is easy to clean.
<Invention of Claim 3>
It is possible to minimize the installation space of both tanks while taking a long supply path of flock-mixed water, and to further reduce the overall size of the apparatus.

<Invention of Claim 4>
The muddy water is supplied to the first agitation chamber, and the flocculant is added to the first agitation chamber. The floc is mixed with the agitation agent, and the floc is formed. Flows out from the upper position of the second stirring chamber toward the settling tank. Here, since the first stirring chamber is stirred with a strong force, the flocculant is evenly mixed in the turbid water to form a floc over the entire area, and when entering the second stirring chamber, the stirring is stably performed with a relatively weak force. Therefore, the generated flocks function rather than being destroyed so that the flocks can gather to form a large flock. That is, the floc can be generated reliably and efficiently.

<Invention of Claim 5>
When the rotation axis is tilted, the flow is rich in change compared with the case where the rotation axis is in a vertical posture, and the stirring ability is enhanced.
<Invention of Claim 6>
Although the structure is relatively simple, the flow can be varied, resulting in enhanced stirring ability.
<Invention of Claim 7>
In the second stirring chamber, basically, a slow and stable stirring is performed, and an upward flow is promoted. It is possible to supply floc mixed water in which the floc is reliably mixed while raising the floc to the settling tank side.

<Embodiment>
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. In this embodiment, the case where it uses for processing muddy water, such as a river, is illustrated.
In the figure, reference numeral 10 denotes a main body frame, which is formed so as to form a horizontally long rectangular parallelepiped by assembling a plurality of frames. Height adjustment is performed at the four corners of the bottom surface of the main body frame 10. Possible legs 11 are provided.
On the upper surface of the main body frame 10, a mounting plate 13 is stretched in a slightly lower half area on the right side when viewed from the front, and a stirring tank 20 is placed in a half weak area on the near side on the mounting board 13. A settling tank 60 is installed in the remaining area on the left side in the main body frame 10 while being installed.

The agitation tank 20 includes a tank body 21 made of a metal plate having a rectangular box shape opened on the upper surface. The tank body 21 has, for example, a horizontal width that is the full width of the mounting plate 13 and a depth that is the depth of the main body frame 10. The depth of the main body frame 10 is about half the height. The inner and outer surfaces of the tank body 21 are painted.
A partition plate 22 is stretched in the tank body 21 at a position slightly closer to the left side than the central portion in the width direction. Specifically, as shown in FIG. It is suspended from the upper edge to a position slightly above the inner bottom surface. Thus, a relatively wide first stirring chamber 23 is formed on the right side of the partition plate 22 and a narrow second stirring chamber 24 is formed on the left side, provided that both the stirring chambers 23 and 24 are mutually connected on the bottom side. Communicate.

  The first agitating chamber 23 is where muddy water is first supplied. Therefore, the introduction pipe 26 projects from the right side surface of the first agitating chamber 23 at the center in the depth direction and closer to the upper end. Has been. As shown in FIG. 3, the leading end of a pumping hose 29 drawn from a throw-in type submersible pump 28 is connected to the introduction pipe 26, and mud pumped up by the submersible pump 28 flows through the pumping hose 29. It is continuously supplied from the introduction pipe 26 into the first stirring chamber 23. Although the supply flow rate is variable depending on the capacity of the submersible pump 28, for example, a maximum of 15 t / hour is possible.

A coagulant supply machine 30 for supplying a powdery coagulant to the above-described first agitation chamber 23 is installed on the back side of the agitation tank 20 on the mounting plate 13.
Examples of the flocculant include paper sludge, bagasse or incinerated ash thereof as a main component as disclosed in JP-A-2005-1315, and powdery Portland cement and a powdery neutral inorganic solidifying agent. And neutral inorganic flocculants containing polyvinyl alcohol resin as active ingredients are suitable.

The flocculant supply machine 30 includes a main body 31 that connects a hopper 33 having a shape like a vertically inverted frustum to an upper surface opening of a box-shaped base 32, and rises from the mounting plate 13. It is attached on the support plate 35 (FIG. 3) provided. A cover plate 33 </ b> A is attached to the upper surface opening of the hopper portion 33.
From the front of the box-shaped base 32 in the main body 31, the delivery pipe 36 protrudes in a horizontal posture, and the tip of the delivery pipe 36 is slightly leftward from the upper surface of the first stirring chamber 23, for example, the center in the width direction. In the depth direction, it faces a position slightly deeper from the center.

The delivery pipe 36 is equipped with a measuring screw 37 driven by a motor 38A, and the box-shaped base 32 is equipped with a stirring screw (not shown) driven by another motor 38B. ing.
That is, the powdery flocculant is charged from the upper surface of the hopper 33 and stored in the main body 31, and is prevented from being solidified by being stirred by the stirring screw, and from the delivery pipe 36 by the measuring screw 37. It is pushed out and falls into the first stirring chamber 23.
The supply amount of the flocculant can be controlled by the rotational speed of the measuring screw 37, and the supply amount in the case of the neutral inorganic flocculant described above is preferably about 0.2 to 0.5% of the supply amount of sewage. It is.

  The first stirring chamber 23 and the second stirring chamber 24 are provided with individual stirring tools 40 and 50, respectively. The first stirring tool 40 on the first stirring chamber 23 side has three flat stirring blades 43 shown in the figure at the same angle at the tip of a rotating shaft 42 that is connected to the output shaft of the first motor 41 and driven to rotate. It is a shape that protrudes radially at intervals. The length of the rotating shaft 42 is about 80% of the depth of the first stirring chamber 23, and the stirring blade 43 is about half the length of the rotating shaft 42 and 1 / width of the lateral width of the first stirring chamber 23. It has a slightly wide and vertically long shape with a width of about 4. Each stirring blade 43 has a plurality of holes 44 that are irregularly arranged over the entire surface thereof.

  On the upper surface of the first stirring chamber 23, a belt-like mounting plate 46 is provided between the upper and lower upper edges at a position slightly to the right of the center in the width direction. By mounting the first motor 41 on the central portion in the depth direction of the mounting plate 46, the stirring blade 43 is mounted in a state of entering the first stirring chamber 23. However, the first stirrer 40 is attached in an inclined posture in which the tip of the rotating shaft 42 is swung to the left by 7 to 8 ° with respect to the vertical axis. Therefore, the stirring blade 43 takes the same inclined posture and is disposed at a position slightly deeper than the center depth position in the substantially central portion of the plane in the first stirring chamber 23.

  Similarly, the second stirring tool 50 on the second stirring chamber 24 side has three flat stirring blades 53 shown in the figure at the tip of a rotating shaft 52 that is connected to the output shaft of the second motor 51 and driven to rotate. It is a shape that is radially extended at equiangular intervals. However, the stirring blade 53 is narrower than the stirring blade 43 of the first stirring tool 40 and has a slightly taller shape instead. In addition, a propeller portion 54 is formed at the lower end portion of each stirring blade 53 to promote an upward axial flow.

  On the second stirring chamber 24 side, a belt-like mounting plate 56 is provided between the front and rear upper edges at the center in the width direction, and the above-described second stirring tool 50 has a depth of the mounting plate 56. By mounting the second motor 51 in the central portion of the direction, the stirring blade 53 is attached in a state of vertically protruding into the second stirring chamber 24. Therefore, the stirring blade 53 takes the same vertical posture and is disposed at a position slightly deeper than the center depth position in the substantially central portion of the plane in the second stirring chamber 24.

In operation, the first stirring tool 40 is driven at a higher rotational speed than the second stirring tool 50. For example, “the number of rotations of the first stirring tool 40: the number of rotations of the second stirring tool 50 = 180 rpm: 80 rpm” is fundamental, the state of sewage (amount of impurities, etc.), water temperature, compatibility with the flocculant, etc. It can be adjusted according to the conditions.
At the upper end position of the front side end portion of the left side surface of the second stirring chamber 24, an outflow pipe 58 for flowing out flock mixed water, which will be described in detail later, is formed protruding toward the left.

In the above-described main body frame 10, in the left region where the mounting plate 13 is not stretched, a storage space 59 having a flat square shape is secured as shown in FIG. 60 is installed.
The sedimentation tank 60 is made of a metal plate such as a stainless steel plate, and as a whole, is a cylindrical tank that is slightly deeper than the height of the main body frame 10. The lower half of the cylindrical portion 61 has a diameter that fits tightly in a square 59, and has a tapered portion 62 that is gradually reduced in diameter downward.

  The sedimentation tank 60 is accommodated in the accommodation space 59 in a form in which the upper half of the upper cylindrical portion 61 is protruded upward from the upper surface of the main body frame 10 and is fixed to the main body frame 10 by a bracket. . At this time, the upper edge of the cylindrical portion 61 is positioned below the outflow pipe 58 protruding from the second stirring chamber 24, and the lower end of the tapered portion 62 is above the lower surface of the main body frame 10. positioned.

  In the settling tank 60 installed as described above, the outer peripheral surface on the back side of the cylindrical portion 61, more specifically, at a substantially central height position of the cylindrical portion 61 and slightly above the upper surface of the main body frame 10. The inflow pipe 64 of flock-mixed water protrudes leftward in a horizontal posture. The inner end of the inflow pipe 64 passes through the peripheral wall of the cylindrical portion 61 and is opened to the inner peripheral surface 61A. The axial line of the inflow pipe 64 is on the back side at a substantially central height position of the cylindrical portion 61. The inner circumferential surface 61 </ b> A is arranged in a tangential direction.

  The outflow pipe 58 of the agitation tank 20 and the inflow pipe 64 of the settling tank 60 are connected by a supply hose 65 having a relatively large diameter and flexibility such as a rubber hose. In detail, as shown in FIG. 1, the supply hose 65 having one end connected to the outflow pipe 58 is bent in the clockwise direction in FIG. From the upper side of the front side of the portion 61 to the outside of the outer peripheral surface on the left side of the cylindrical portion 61, the pipe is formed in a substantially arc shape, and the other end is connected to the inflow pipe 64.

From the opening at the lower end of the taper portion 62 of the settling tank 60, a discharge pipe 66 of the floc F protrudes. The discharge pipe 66 protrudes downward and is bent to the right. A manual open / close valve 67 is interposed in the discharge pipe 66. As shown in FIG. 3, a drain hose 68 can be connected to the discharge pipe 66.
In addition, a drain pipe 70 for draining the supernatant water is formed at the upper end position on the left side surface of the cylindrical portion 61 so as to protrude leftward. A drain hose 71 can be connected to the drain pipe 70.

  In addition, on the back side of the installation position of the sedimentation tank 60 in the main body frame 10, there is provided a control box 75 in which various control units are stored and an operation unit for setting and the like is provided. In the control box 75, for example, when the supply flow rate of sewage, that is, the capacity of the submersible pump 28 is set according to the state of sewage at the site, the rotation speed of the measuring screw 37 of the coagulant supply machine 30 can be controlled according to the setting. It has become. Moreover, the rotation speed of the 1st and 2nd stirring tools 40 and 50 can be set separately.

  The present embodiment has the structure as described above, and the operation thereof will be described subsequently. As shown in FIG. 3, the apparatus is installed on a site such as on a river embankment or on a loading platform of a truck stopped at the site. A notch tank 77 is installed around the apparatus, and one end of a drainage hose 71 is connected to a drainage pipe 70 of supernatant water provided at the upper end of the sedimentation tank 60, and the other end is placed in the notch tank 77. Further, for example, a sandbag 78 is provided directly on the step surface in the middle of the bank, or accommodated in the frame, and one end of the drain hose 68 is connected to the discharge pipe 66 of the floc F provided at the lower end of the sedimentation tank 60. Are connected and the other end is placed in the sandbag 78. At the same time, one end of a pumping hose 29 is connected to an introduction pipe 26 projecting from the agitation tank 20 (first agitation chamber 23), and a submersible pump 28 provided at the other end is poured into the river water.

In the control box 75, the capacity of the submersible pump 28 is set, and the rotational speed of the measuring screw 37 of the flocculant supply machine 30 is controlled accordingly. Moreover, the rotation speed of the 1st and 2nd stirring tools 40 and 50 is set.
On the other hand, on the upstream side of the input position of the submersible pump 28, the bottom of the river is dug up by a shovel car, and sewage in which a large amount of impurities such as sludge soaring is mixed is generated.

  When the submersible pump 28 is driven in this state, the pumped muddy water passes through the pumping hose 29 and is directed toward the first stirring chamber 23 of the stirring tank 20 as shown by an arrow a in FIGS. 1 and 2. While being continuously introduced from above, the flocculant is charged into the mud water, and while being stirred by the first stirrer 40 and the second stirrer 50, the inside of the first stirrer chamber 23 is moved downward, followed by the same stirrer. While entering the second stirring chamber 24 from the bottom of the chamber 23 and flowing upward, a floc F is formed.

  Here, in the first stirring chamber 23, the first stirring tool 40 is driven at a relatively high rotational speed, so that the first stirring chamber 23 is stirred with a so-called strong force, and the first stirring chamber 23 has a planar rectangular shape. In addition to the above, the stirring blades 43 rotate around an axis inclined with respect to the vertical direction, and the holes 44 are irregularly formed in each of the stirring blades 43. As a result, the flocculant is evenly mixed into the sewage and floc F is formed over the entire area.

  On the other hand, in the second agitation chamber 24, the second agitator 50 is driven at a relatively low rotational speed, and the agitation blade 53 rotates around the vertical axis. The flocs F generated on the first stirring chamber 23 side are not destroyed, but rather function so that the flocs F gather together to form a large floc F. Moreover, since the propeller part 54 is provided in the lower end part of each stirring blade 53, and the axial flow to upper direction is positively encouraged, the same flock F mixed reliably while raising the flock F Flowed upward as flock-mixed water.

  As described above, the floc-mixed water that has flowed to the upper side of the second stirring chamber 24 passes through the outflow pipe 58 provided at the upper position of the second stirring chamber 24 as shown by the arrow b in FIGS. 1 and 2. After flowing out and flowing through the supply hose 65 piped in an arc over the semicircular circumference around the cylindrical portion 61 of the settling tank 60, from the inflow pipe 64 provided on the back side of the cylindrical portion 61, the arrow c in FIG. As shown in FIG. 5, the liquid is discharged in a substantially tangential direction with respect to the inner peripheral surface 61A on the back side of the cylindrical portion 61, and flows so as to wind a vortex along the inner peripheral surface extending from the cylindrical portion 61 to the upper side of the tapered portion 62. Supplied.

  Here, the floc-mixed water that has flowed out of the outflow pipe 58 flows together in the supply hose 65 along a substantially arcuate path, and the flocs F gather to form a larger floc F. The floc-mixed water mixed with such a large floc F is discharged in a tangential direction with respect to the inner peripheral surface 61A of the cylindrical portion 61 when flowing into the settling tank 60, so that the impact is suppressed. It is avoided that the floc F is crushed. After that, when the vortex flows from the cylindrical portion 61 along the inner peripheral surface on the upper side of the tapered portion 62, in addition to smoothly flowing without receiving an impact, the flock F in the same flow rotates. The flocs F that floated in the group gather to form a larger floc F.

After that, the floc F generated as described above is precipitated by gravity and collected at the bottom of the taper portion 62 to be solid-liquid separated, and the supernatant water is collected on the upper side of the precipitation tank 60. Here, since each floc F is large and heavy, it is easy to settle without floating, and the supernatant water is in a state with very few impurities. The supernatant water passes through the drainage hose 71 from the drainage pipe 70 provided on the upper end side of the settling tank 60 (cylindrical portion 61) and enters the notch tank 77 as shown by the arrow d in FIGS. Drained.
On the other hand, the on-off valve 67 interposed in the discharge pipe 66 of the settling tank 60 is appropriately opened (for example, about 10 seconds every time interval of 1 to 2 minutes), and the flock F accumulated in the tapered portion 62 is shown in FIG. As indicated by the arrow e in FIG. 2, the water is discharged from the discharge pipe 66 and passed through the drain hose 68 and discarded in the sandbag 78. The floc F is further drained by the sandbag 78 and collected as a solid substance with very little moisture.

The supernatant water stored in the notch tank 77 is discharged downstream, for example, from the input position of the submersible pump 28 in the river. Further, the solid matter (floc) stored in the sandbag 78 is discarded at a predetermined position on the site, or is transported to another predetermined place and discarded.
The apparatus is cleaned after operation by washing with water or the like. At this time, there is a possibility that a part of the flock F or the like is accumulated in the supply hose 65. Since the supply hose 65 can be removed from both tanks 20 and 60 by removing both ends from the outflow pipe 58 and the inflow pipe 64, the inside can be easily cleaned.

According to this embodiment, the following advantages can be obtained.
In this embodiment, when supplying the flock mixed water formed in the agitation tank 20 to the precipitation tank 60, the supply hose 65 is circulated and then discharged in a tangential direction with respect to the inner peripheral surface of the precipitation tank 60. It is said. With this structure, while the floc-mixed water flows through the supply hose 65, the small flocks F gather to gradually become a large flock F, and further, the floc-mixed water mixed with such a large flock F becomes the cylindrical portion 61. By being discharged without receiving an impact on the inner peripheral surface 61A and continuously flowing along the inner peripheral surface, the flock F is not crushed but rather the floating flock F is gathered. Furthermore, it becomes a big floc F. As a result, since each floc F becomes large and heavy, it becomes easy to settle without floating, solid-liquid separation is performed reliably, and the supernatant water with very few impurities can be taken out.
Note that the longer the supply hose 65 is, the larger the floc F can be made. As a result, it can be said that the supply hose 65 is advantageous for solid-liquid separation, but the supply hose 65 is piped along the outer peripheral surface of the cylindrical portion 61 of the stirring tank 20. Therefore, the piping space can be kept small.
Therefore, the solid-liquid separation process can be performed with high accuracy and efficiency while keeping the entire apparatus compact.

  In particular, the stirring tank 20 and the precipitation tank 60 are installed adjacent to each other, and the supply hose 65 is piped along the outer peripheral surface of the cylindrical portion 61 of the precipitation tank 60 that does not face the stirring tank 20. Since the structure is adopted, it is possible to minimize the installation space for both tanks 20 and 60 after taking a long supply path for the flock-mixed water, and further downsizing the entire apparatus can be realized. Further, the supply hose 65 can be easily removed, which is convenient when the supply hose 65 is cleaned.

Further, on the stirring tank 20 side, a so-called two-tank structure of the first stirring chamber 23 and the second stirring chamber 24 is adopted, and sewage is introduced into the first stirring chamber 23 side from the upper side, and is then allowed to sink downward. In addition to forming a flow such as raising the stirring chamber 24, the flocculant is introduced on the first stirring chamber 23 side, and in addition, strong and varied stirring is performed in the first stirring chamber 23, and the second stirring is performed. In the chamber 24, weak and stable agitation is performed and an upward axial flow is positively promoted. Therefore, in the first stirring chamber 23, the flocculant is evenly mixed with the sewage and flocs F are formed over the entire area, while in the second stirring chamber 24, the flocs F generated on the first stirring chamber 23 side are Rather, it functions so that the flocks F gather together to form a large flock F without being destroyed, and also functions to lift the flock F and flow it upward as flock-mixed water in which the flock F is reliably mixed.
That is, it is possible to generate floc-mixed water in a state where a relatively large floc F is formed and the floc F is reliably mixed and supplied to the subsequent settling tank 60.

The muddy water treatment apparatus of the present embodiment has a processing capacity of 15 t / hour when processing general muddy water, but as outer dimensions, the frontage is 1,700 mm, the depth is 1,110 mm, The height excluding the hopper 31 is 2,000 mm, and the weight is basically 300 kg and at most about 350 kg. With such external dimensions and weight, for example, it can be easily placed on the platform of a light truck.
On the other hand, a conventional processing apparatus generally has a mechanical weight of about 3 t with respect to a processing capacity of 5 t / hour. If the processing capacity is the same as that of the present embodiment, the weight is 10 t or more. It is considered to be.
That is, according to the present embodiment, the entire apparatus can be combined in a very compact and lightweight manner as compared with the conventional apparatus.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, the on-off valve provided on the floc discharge pipe in the sedimentation tank is manually opened and closed. May be. In addition, a transmission type sensor that detects floc accumulated in the sedimentation tank is provided, and a small compressor is provided. When the amount of floc stored exceeds a predetermined level, the open / close valve is opened and the floc is pushed out by water pressure. Control may be performed such that the on-off valve is closed when the number is reduced.

(2) The floc-mixed water supply pipe may have a fixed shape such as metal or hard synthetic resin that does not have flexibility.
(3) If a long path for supplying floc-mixed water from the stirring tank to the precipitation tank is taken, that is, priority is given to increasing the length of the supply hose, a slight increase in space is incurred, but the precipitation tank is removed from the stirring tank. The supply hose may be arranged a little apart, and the supply hose may be wound around the outer peripheral surface of the settling tank a plurality of times for piping.
(4) The supernatant water taken out from the sedimentation tank may be once introduced into the sandbag, filtered, and then stored in the notch tank anew, so that it can be taken out as fresh water with a further reduced amount of impurities. .

(5) In the above embodiment, in order to make the stirring force by the first stirring tool larger than that of the second stirring tool, the rotation speed of the first stirring tool is set larger than that of the second stirring tool. However, other means such as varying the size and shape of the stirring blades may be taken.
(6) In the first stirrer, one or both of tilting the rotation shaft and perforating the stirring blade may not be employed. Moreover, in the 2nd stirring tool, you may not provide a propeller part.
(7) The basic structure of both the first stirrer and the second stirrer adopts a structure in which a plurality of flat stirrer blades are provided radially on the rotating shaft, and has the advantage of easy manufacture. However, any other structure may be used as long as it has a stirring function.

(8) The agitation tank is not limited to the so-called two-tank type illustrated in the above embodiment, and a floc is generated by agitation while mixing the flocculant in the muddy water. Any other structure may be used as long as it can be supplied to the settling tank side.
(9) The aggregating agent is not limited to the neutral inorganic aggregating agent exemplified in the above embodiment, but a neutral inorganic aggregating agent that becomes another component, further a cement / lime-based aggregating agent, or an organic polymer. A system flocculant may be used.
(10) Furthermore, the present invention is not limited to sewage in rivers and the like, and is widely applied to solid-liquid separation in general when turbid water mixed with impurities, such as wastewater from food processing factories and wastewater from livestock facilities, is used. It is possible.

The partially notched top view of the processing apparatus which concerns on one Embodiment of this invention Same part cutaway front view Schematic perspective view showing the operating state of the processing apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Main body frame 20 ... Stirring tank 21 ... Tank main body 22 ... Partition plate 23 ... 1st stirring chamber 24 ... 2nd stirring chamber 26 ... Introducing pipe 30 ... Flocculant supply machine 36 ... Delivery pipe 40 ... 1st stirring tool 41 ... 1st motor 42 ... rotating shaft 43 ... stirring blade 44 ... hole 50 ... 2nd stirring tool 51 ... 2nd motor 52 ... rotating shaft 53 ... stirring blade 54 ... propeller part 58 ... outflow pipe 60 ... sedimentation tank 61 ... cylindrical part 61A ... Inner peripheral surface (of cylindrical part 61) 62 ... Tapered part 64 ... Inflow pipe 65 ... Supply hose (supply pipe)
66 ... discharge pipe (discharge port)
67 ... Open / close valve 70 ... Drain pipe (drain)
F ... frock

Claims (7)

A turbid water is sequentially supplied, and an agitation tank that forms a floc by stirring with a stirrer while adding the aggregating agent from the aggregating agent supply machine to the supplied muddy water,
Flock mixed water mixed with flocs generated in this stirring tank is supplied, and a settling tank for separating solid and liquid by precipitating the flocs is provided side by side,
This sedimentation tank has a vertically-oriented cylindrical shape and a tapered portion whose diameter is gradually reduced toward the lower side, and a flock discharge port that can be opened and closed at the lower end of the tapered portion has an upper side. A supernatant water drain is provided at a position near the upper end of the cylindrical portion,
The supply pipe of the floc mixed water is drawn out from the stirring tank, and the supply pipe is piped along the circumferential direction with respect to the outer peripheral surface of the cylindrical part in the settling tank, and the tip of the supply pipe is connected to the cylindrical part. A muddy water treatment apparatus, characterized in that the muddy water treatment apparatus is arranged with respect to the inner circumferential surface of the cylindrical portion in a posture that penetrates the peripheral wall and faces substantially in a tangential direction. While the supply pipe is a flexible hose, the floc-mixed water outflow pipe is in the stirring tank, and the settling tank is an inflow pipe oriented in a tangential direction with respect to the inner peripheral surface of the cylindrical portion. And the hose is piped along the outer peripheral surface of the cylindrical portion of the settling tank, and one end and the other end of the hose are connected to the outflow pipe and the inflow pipe, respectively. The muddy water treatment apparatus according to claim 1. The stirring tank and the precipitation tank are installed close to each other, and the hose is piped along an outer peripheral surface of the cylindrical portion of the precipitation tank that does not face the stirring tank. The muddy water treatment apparatus according to claim 2. The stirrer is a first stirrer in which the muddy water is supplied to one side of the partition plate by stretching the partition plate in a rectangular box shape with a predetermined size floating from the inner bottom surface. The chamber is formed on the other side in a state where the second stirring chamber that allows the floc-mixed water to flow out from the upper position is in communication with the bottom side.
The flocculant feeder is equipped in the first stirring chamber, the stirring tool is separately installed in the first stirring chamber and the second stirring chamber, and the stirring tool on the first stirring chamber side is provided. The turbid water treatment apparatus according to any one of claims 1 to 3, wherein the stirring capacity is set to be larger than that of the stirring tool on the second stirring chamber side. The stirrer has a shape in which a plurality of stirring blades are provided on a vertical rotation shaft driven by a motor, and the stirrer in the first stirring chamber has the rotation shaft inclined with respect to the vertical direction. The muddy water treatment apparatus according to claim 4, wherein the muddy water treatment apparatus is arranged in a posture. The stirring tool provided in the first stirring chamber has a shape in which a plurality of flat stirring blades are provided on a vertical rotating shaft driven by a motor, and the stirring blade has a plurality of holes. 6. The muddy water treatment apparatus according to claim 4, wherein the turbid water treatment apparatus is opened in an irregular arrangement. The stirring tool equipped in the second stirring chamber is provided with a plurality of plate-like stirring blades on a vertical rotating shaft driven by a motor, and an axial flow upward at the lower end of each stirring blade. The muddy water treatment apparatus according to any one of claims 4 to 6, wherein a propeller portion that promotes the above is formed.

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