JP2006239619A - Turbid water treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turbid water treatment apparatus constituted so as to automatically meter and supply a floccurant not only to enhance the efficiency of the treatment of turbid water but also to flocculate flocs without using a sedimentation tank to reconcile the compactification and efficiency of the apparatus. <P>SOLUTION: The turbid water treatment apparatus is constituted of a neutralization treatment device 15 for blowing carbon dioxide in turbid water to neutralize the turbid water, flocculant tanks 16, 17 and 19 for storing a flocculant solution, a flocculant automatic supply device 18 for automating a series of processes from the metering and dissolution of the flocculant to the automatic supply of the flocculant solution to the flocculant tanks 16 and 17, and a flocculation device 20 having spiral type line mixers 60a and 60b for stirring and mixing the flocculant charged from the flocculant tanks and the neutralized turbid water and flocculating the floating matter in the turbid water to accelerate floc forming reaction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a muddy water treatment apparatus for treating muddy water generated at a site of civil engineering and construction work.

  In civil engineering and construction work, when excavating the ground, water flows out of the ground and a large amount of muddy water is generated. The excavation work is continued while draining muddy water with a pump, but the muddy water drained at this time contains a large amount of earth and sand. After the treatment, it is necessary to separate into solid matter such as soil and water.

  Conventionally, turbid water treatment is generally performed by aggregating and floating flocs of foreign substances such as soil suspended in turbid water, precipitating the flocs that have agglomerated and growing, and performing solid-liquid separation. It consists of a treatment process of draining water and discarding the accumulated sludge as it is or after dehydration and disposal.

  In this kind of muddy water treatment, it is important to improve the treatment efficiency how the solid matter floating in muddy water is agglomerated into a large particle-shaped floc. For this reason, the process which mixes PAC (polyaluminum chloride), a polymer flocculant, etc. with turbid water as an aggregating agent becomes indispensable.

In recent years, a muddy water treatment device in which a set of devices for performing this kind of muddy water treatment is unitized has been used, and as its prior art, for example, the one described in JP-A-7-204657 is taken as an example Can be mentioned.
JP-A-7-204657

  However, in the conventional turbid water treatment apparatus, when preparing the solution of the flocculant, the on-site workers often dissolve it manually and add it to the suspension. For this reason, forgetting to replenish the flocculant or proceeding with the muddy water treatment with insufficient dissolution often causes the untreated muddy water to be washed away, and the piping to be blocked, causing trouble.

  In addition, as a method of agglomerating suspended matter in muddy water so as to gradually become larger flocs, a method in which muddy water is put into a settling tank and the flocks naturally settle is the mainstream, and a large size is required to increase the processing capacity. There was a problem that a sedimentation tank was required and the apparatus was enlarged.

  Therefore, the object of the present invention is to solve the problems of the prior art, automatically measure and replenish the flocculant, improve the efficiency of turbid water treatment, and separate the agglomerated floc without using a settling tank. Therefore, an object of the present invention is to provide a muddy water treatment apparatus that can achieve both compactness and efficiency of the apparatus.

  In order to achieve the above object, the present invention provides a muddy water treatment apparatus for treating muddy water generated in civil engineering and construction work, a neutralization treatment apparatus for neutralizing muddy water by blowing carbon dioxide into muddy water, and a coagulant dissolving agent. A flocculant tank for storing liquid, a flocculant automatic replenishing device that automatically performs a series of steps from metering and dissolution of the flocculant to automatic replenishment of the flocculant solution into the flocculant tank, and the flocculant A flocculant having a spiral line mixer that stirs and mixes the flocculant charged from the tank and turbid water and flocculates suspended matter in the turbid water to promote floc formation reaction. is there.

  Further, the present invention is provided in a muddy water treatment apparatus for treating muddy water generated in civil engineering and construction work, and a coagulation apparatus for mixing flocculant with muddy water, coagulating suspended matter in muddy water and promoting flock generation In the middle of the turbid water treatment pipe through which the mixed liquid of turbid water and a flocculant flows, a line mixer in which a baffle plate extends in a spiral shape is incorporated in the inner peripheral portion of the pipe body, and the inner diameter is larger than the inner diameter of the line mixer inlet. Is characterized by a larger value.

  Furthermore, the present invention has a hopper for charging a powdery flocculant used for turbid water treatment, and a dissolution stirring tank for dissolving the flocculant supplied from the hopper in water. In the flocculant automatic replenishment device for replenishing the flocculant solution to the flocculant tank of the turbid water treatment device, the flocculant supplied to the dissolution stirring tank and the stirrer for stirring the water, and the flocculant is measured from the hopper A metering unit for supplying to the dissolution tank; a water supply electromagnetic valve for opening and closing a flow path for supplying water to the dissolution stirring tank; and a water supply level detecting means for detecting the level of the liquid level supplied to the dissolution stirring tank. A flocculant level detecting means for detecting a liquid level of the flocculant solution replenished in the flocculant tank, and a flocculant for opening and closing a flow path for supplying the flocculant solution from the dissolution stirring tank to the flocculant tank Solenoid valve for In response to changes in the liquid level of the flocculant solution in the destirring tank and the liquid level of the flocculant, the metering unit and the stirring device are started and stopped according to a predetermined sequence, and a water supply solenoid valve and And a controller for controlling the opening / closing operation of the coagulant electromagnetic valve.

  Furthermore, the present invention is a solid-liquid separation device for separating flocs, which are provided in a turbid water treatment device for treating turbid water generated in civil engineering and construction work, and in which suspended matter in muddy water mixed with a flocculant is condensed, It is characterized by supplying a turbid water to a rotating cylindrical screen, scooping out flocks, and forcibly separating water and sludge.

  According to the present invention, the coagulant is automatically metered and replenished to improve the efficiency of turbid water treatment, and the coagulated floc is separated without using a settling tank, thereby achieving both compactness and efficiency of the apparatus. Can be achieved.

Hereinafter, one embodiment of a muddy water treatment apparatus according to the present invention will be described with reference to the accompanying drawings.
1. 1 is an overall configuration diagram of a turbid water treatment apparatus according to the present embodiment. In FIG. 1, reference numeral 10 indicates a muddy water treatment apparatus. Reference numeral 12 indicates a raw water tank for temporarily storing muddy water generated at a construction site. Reference numeral 14 denotes a solid-liquid separator that separates solids and water from the treated muddy water.

  A muddy water pump 21 is installed at the bottom of the raw water tank 12. A pipe extending from the discharge port of the muddy water pump 21 is connected to the inlet 22 of the muddy water treatment apparatus 10, and muddy water sent from the raw water tank 12 is introduced into the muddy water treatment apparatus 10 from the inlet 22. The turbid water treatment device 10 includes a neutralization treatment device 15 for neutralizing turbid water with carbon dioxide gas, flocculant tanks 16 and 17 for storing a flocculant solution, and measurement and dissolution of the flocculant from the flocculant tanks 16 and 17. The flocculant automatic replenishment device 18 that automatically performs a series of steps up to the automatic replenishment of the flocculant, the flocculant charged from the flocculant tanks 19, 16, and 17 and the neutralized turbid water are stirred and mixed to float The aggregating apparatus 20 that promotes the reaction of aggregating the flocs into flocs is a major constituent unit. In FIG. 1, 11 is a control device for controlling the operation of each part of the muddy water treatment device, 13 is an operation panel, and 21 is a water quality monitoring panel.

2. Neutralization Treatment Device An electromagnetic flow rate control valve 23 is provided downstream of the inlet 22 of the turbid water treatment device 14, and turbid water controlled to an appropriate flow rate by the electromagnetic flow rate control valve 23 is introduced into the neutralization treatment device 15. Is done. The neutralization treatment device 15 includes a neutralization line mixer 24 for mixing neutralizing carbon dioxide gas and turbid water. The turbid water whose flow rate is adjusted by the electromagnetic flow control valve 23 and the carbon dioxide gas are contained in the neutralization treatment device 15. It is introduced into the sum line mixer 24. In addition, unlike the line mixers 60a, 60b, and 60c used in the aggregating apparatus 20 described later, the neutralizing line mixer 24 needs to be rapidly stirred in the process of neutralizing turbid water with carbon dioxide gas. Therefore, the well-known line mixer which combined the right screw and the left screw conventionally used for muddy water neutralization is used.

3. Flocculant tank
In this embodiment, as the flocculant tank, a first flocculant tank 16 and a second flocculant tank 17 are arranged in order from upstream to downstream. Among these, the first flocculant tank 16 has, for example, a PAC solution (for example, a PAC solution (as a flocculant for assisting molecular bonding of substances suspended in turbid water) in order to create a nucleus necessary for the flocculation of suspended matter in turbid water. Polyaluminum chloride) is stored. The second flocculant tank 17 stores a polymer flocculant solution as a flocculant for gathering the generated nuclei and grouping them in a spider web. When the polymer flocculant solution in the second flocculant tank 17 is insufficient, it is automatically replenished from the polymer flocculant dissolution stirring tank 30 provided in the flocculant automatic replenishing device 18. It is like that.

4). Flocculant automatic replenishment device
Next, the flocculant automatic supply device 18 will be described.
In FIG. 1, the flocculant automatic replenishing device 18 is a device for replenishing the second flocculant tank 17 with the polymer flocculant solution from the dissolution stirring tank 30.

  In this embodiment, the flocculant automatic replenishing device 18 includes a hopper 32 for charging and measuring a powdery polymer flocculant in addition to the polymer aggregating agent dissolution stirrer 30, and a dissolution stirrer tank 30. The main components are a stirrer 34 that stirs the flocculant and water supplied to, and a metering unit 36 that measures the polymer flocculant and supplies it to the dissolution stirrer 30.

  Therefore, the configuration of the hopper 32 and the stirring device 34 is shown in FIG. The bottom of the hopper 32 is a measuring port 37, and a screw feeder 38 is arranged in a horizontal posture in the measuring port 37. The screw feeder 38 is driven by a motor 39. In this case, since the blades extend spirally at a constant pitch on the rotating shaft of the screw feeder 38 and the amount of the polymer flocculant transferred per unit time is determined in advance, the driving time of the motor 39 is reduced. By controlling with a timer (not shown), the polymer flocculant supplied to the dissolution and stirring tank 30 can be measured.

  When the polymer flocculant is transported while being metered by the screw feeder 38, the polymer flocculant is solidified at the inlet and outlet portions of the screw feeder 38, so-called bridges are easily formed and are easily clogged. Therefore, as means for eliminating the bridge of the polymer flocculant, a bridge breaking stirrer 41 is provided at the inlet, and an air nozzle 42 for air blow is provided at the outlet.

  As shown in FIG. 3 which is a view taken along the line III-III in FIG. 2 and FIG. 4 showing a plan view, the stirrer 41 for breaking the bridge has a blade having a blade attached to a rotating shaft parallel to the axis of the screw feeder 38. In this case, it can be interlocked with the screw feeder 38, or can be started and stopped independently. On the other hand, the air nozzle 42 has an outlet opening in the passage of the outlet portion of the screw feeder 38. When an electromagnetic valve (not shown) is opened, air supplied from the air pipe is jetted toward the outlet portion passage. ing. Therefore, even if a bridge is likely to be formed while the screw hole 38 is stopped, it can be broken by the stirrer 41 or blown away by the air ejected from the air nozzle 42, thereby preventing a clogging trouble. it can.

  Next, in FIG. 2, the polymer flocculant measured by the screw feeder 38 is put into the dissolution stirring tank 30 and dissolved in water. Therefore, the dissolution stirring tank 30 will be described.

  Water is supplied to the dissolution stirring tank 30 through a water supply pipe 45. A water supply electromagnetic valve 46 is attached to the water supply pipe 45. Further, electrode bars 47a to 47c for detecting the level of the liquid level are arranged in the dissolution and stirring tank 30. Of these, the electrode bar 47c detects the upper limit of the liquid level, and the electrode bar 47a detects the lower limit of the liquid level. Similarly, electrode rods 48a to 48c for detecting the upper and lower limits of the liquid level are also arranged in the second flocculant tank 17.

  A stirring device 34 is installed in the dissolution stirring tank 30. The stirring device 34 includes a motor 51, a rotating shaft 52, and a punch metal type stirring blade 53 attached to the rotating shaft 52. In this case, the stirring blade 53 is a blade in which a large number of holes 54 are punched, and the stirring efficiency is improved by utilizing the disturbance of the flow when passing through these holes 54.

  In FIG. 1, the automatic flocculant replenishment device 18 as described above is controlled by the control device 11, and changes in the liquid level of the flocculant solution in the dissolution stirring tank 30 and the liquid level of the flocculant tanks 16 and 17. Accordingly, sequence control is executed in a predetermined order.

  In FIG. 2, the flocculant solution dissolved in the dissolution / stirring tank 30 is sent to the second flocculant tank 17 through the solution supply pipe 56 by the pump 55. An electromagnetic valve 58 is provided in the solution supply pipe 56.

5. Aggregation apparatus Next, an aggregation apparatus 20 that aggregates suspended matters in muddy water to generate floc will be described with reference to FIGS. 1 and 5.
In this embodiment, the pipe extending downstream of the electromagnetic flow control valve 23 is the muddy water treatment pipe 60 that constitutes the aggregating apparatus 20. In this muddy water treatment pipe, two line mixers 60a and 60b are connected in series.

  In this embodiment, the PAC flocculant in the first flocculant tank 16 and the polymer flocculant in the second flocculant tank 17 are sucked out by the pumps 62 and 63, respectively, and are line mixers via check valves 64 and 65, respectively. 60a and 60b.

  The line mixers 60a and 60b are the same type and have the characteristics shown in FIG. 5 (in FIG. 5, the reference numeral 60 indicates a line mixer).

  Two baffle plates 72 a and 72 b extend in a spiral shape on the inner peripheral portion of the tube body 70 of the line mixer 60. As shown in FIG. 6, the two baffle plates 72 a and 72 b are twisted in the left-right direction while forming a passage space 74 in the center of the tube body 70.

In FIG. 5, when the inner diameter D1 of the pipe body 70 of the line mixer 60 is assumed, the inner diameter of the inlet portion is D2, and the inner diameter of the outlet portion is D3,
D2 <D3 <D1
Therefore, the inner diameter of the line mixer 60 is different between the inlet and the inner and the outlet.

6). Solid-liquid separator
Next, the solid-liquid separator 14 will be described with reference to FIG.
In a conventional turbid water treatment device, turbid water mixed with a flocculant is sent to a sedimentation tank, and the suspended solids agglomerate around the nucleus, waiting for the natural flocs to form, and natural sedimentation that separates flocs and water. Although the method has been adopted, in the muddy water treatment apparatus according to the present embodiment, a forced solid-liquid separation device 14 using a drum screen as described below is adopted.

  In this embodiment, in the solid-liquid separator 14, the turbid water mixed with the polymer flocculant by the line mixer 60b is once sent to the retention tank 80. In this staying tank 80, flocs that have progressed in agglomeration reaction are floating, and muddy water in this state is sent to the drum screen 82. The drum screen 82 is a cylindrical screen made of a special polyester sheet mat, and is driven to rotate by a motor (not shown), so that the floc scooped out from muddy water is separated into water and sludge by centrifugal force. A drainage tank 84 that receives the separated water is disposed under the drum screen 82, and the water accumulated in the drainage tank 84 is discharged to a drain outlet. The water in the drainage tank 84 is appropriately sent to the sampling device 85, and the water quality is checked by the sampling device 85. The result is displayed on the water quality monitoring board 21.

  On the other hand, the floc scooped by the drum screen 82 becomes sludge and adheres to the drum screen. In the solid-liquid separator 14 of this embodiment, an air blow device 86 is disposed on the drum screen 82 in order to remove the attached sludge. Air is supplied from the blower 87 to the air blow device 86. The air blowing device 86 has air outlets arranged along the width direction of the drum screen 82, and air is blown to the entire rotating drum screen 82. The sludge removed from the drum screen 82 by the blowing of air falls on the chute 88 and is collected in the sludge tank 89.

The present embodiment is configured as described above. Next, the operation and effect will be described.
7). Neutralization treatment
In FIG. 1, when turbid water whose flow rate is adjusted by the electromagnetic flow control valve 23 and carbon dioxide from the carbon dioxide cylinder 26 are introduced into the neutralization line mixer 24, the neutralization line mixer 24 rapidly By stirring, carbonic acid reacts with the alkali contained in the muddy water to neutralize it. The neutralized turbid water is mixed with the flocculant while being sequentially sent to the two line mixers 60 a and 60 b arranged in series in the turbid water treatment pipe 60.

8). Aggregation treatment
In this embodiment, the inner diameters of the line mixers 60a and 60b are different between the inlet and the inner, and the outlet, so that the mixing and stirring suitable for both the flocculant and turbid water are realized as follows. can do. That is, when the flocculant and muddy water enter from the inlet of the line mixer 60, they are mixed while flowing along the baffle plates 72a and 72b. In this case, since the baffle plates 72a and 72b are twisted to the left and right while forming the passage space 74 in the center, the water flow is a one-way flow along the twist direction of the baffle plates 72a and 72b. In addition, as a result of the inner diameter being larger than the inlet of the line mixer 60, the mixture is stirred while being mixed in a state where the pressure and flow velocity of the turbid water is lowered, so that the generated nucleus and flocs are excessively destroyed. Stirring can be prevented from being added, and a water flow suitable for the agglomeration reaction can be realized while adding moderate stirring.

  Moreover, since two such line mixers 60a and 60b are connected in series, the outlet is throttled when leaving the upstream line mixer 60a, so the pressure of the turbid water is increased again and the next Aggregation is promoted in a state where the flow velocity and pressure are reduced as described above. By repeating this depressurization, mixing, and pressurization, efficient stirring and coagulation promotion can be added, while the turbid water treatment pipe 60 is simply connected to the line mixers 60a and 60b. Since it is not necessary to use a tank for installation, the installation space can be greatly reduced.

  The upstream line mixer 60a uses PAC as a flocculant to promote the generation of floc-growth nuclei, and the downstream line mixer 60b collects nuclei using a polymer flocculant as a flocculant to collect flocs. It is promoted to grow like a spider web.

9. Flocculant dissolution and automatic replenishment
Thus, as the processing in the line mixers 60a and 60b proceeds, the flocculant accumulated in the first flocculant tank 16 or the second flocculant tank 17 gradually decreases. Among these, for the second flocculant tank 17 with the larger amount of flocculant consumed, the flocculant automatic replenishing device 18 removes the polymer flocculant solution from the dissolution agitation tank 30 as follows. The agent tank 17 is replenished.

Therefore, a sequence executed by the control device 11 will be described with reference to FIGS. 1 and 2, taking automatic replenishment to the second flocculant tank 17 as an example.
First, when the switch is turned on and the operation mode is automatically replenished, the water supply electromagnetic valve 46 is opened and water supply to the dissolution and stirring tank 30 is started. In the dissolution and stirring tank 30, the liquid level rises, and when the liquid level finally reaches the tip of the electrode rod 47c, the water supply electromagnetic valve 46 is closed and the water supply is stopped.

  In the dissolution and stirring tank 30, the motor 51 of the stirring device 34 and the motor 39 of the screw feeder 38 are activated simultaneously with the stop of water supply. The screw feeder 38 is controlled to start and stop by a metering timer, and automatically stops when it rotates for a set time corresponding to the amount of polymer flocculant to be charged. Charged into the dissolution and stirring tank 30. In addition, about dissolution time, it can set freely with the timer for stirring.

  When the dissolution is finished, the stirring device 50 is stopped and the transfer electromagnetic valve 58 is opened. As a result, the dissolved flocculant solution is supplied to the second flocculant tank 17. Then, in the second flocculant tank 17, when the liquid level reaches the tip of the electrode rod 48c, the transfer electromagnetic valve 58 is closed, so that the second flocculant tank 17 is filled with the flocculant solution.

  Thereafter, this operation is repeated, and when the dissolved liquid in the dissolution electrolyzer 30 decreases and the liquid level drops below the lower end of the electrode rod 47a, the water supply electromagnetic valve 46 opens to supply, measure, dissolve, and replenish water. Repeat the above operation.

  The polymer flocculant is solidified at the inlet and outlet of the screw feeder 38, so that a so-called bridge is formed and clogs easily. However, when the bridge breaker stirrer 41 is started in synchronization with the start of the screw feeder 38 and the air is blown out from the air nozzle 42 for air blow at the outlet, the bridge is surely prevented from being clogged. can do.

10. Solid-liquid separation process
In the solid-liquid separation device 14, the turbid water in which floc aggregation reaction has progressed while being mixed with the polymer flocculant by the line mixer 60 b is once sent to the retention tank 80 and then sent to the drum screen 82. This drum screen 82 forcibly separates the scooped floc into water and sludge by centrifugal force, so there is no need to wait for the floc to settle naturally in the retention tank, enabling efficient solid-liquid separation processing In addition, when the processing capacity is increased conventionally, a larger retention tank is required, so that significant space saving can be realized. For this reason, it is possible to configure a device that performs all the processes from neutralization treatment to coagulation treatment, automatic replenishment of coagulant, and solid-liquid separation treatment as a compact unit, and it can also be installed in vehicles etc. It becomes possible.

  Further, since the sludge adhering to the drum screen 82 can be easily removed by air blowing, the separation function of the drum screen 82 can be regenerated with the sludge, and the cleaning operation can be easily performed.

The systematic diagram of the muddy water processing apparatus by one Embodiment of this invention. The block diagram of the coagulant | flocculant automatic replenishment apparatus with which a muddy water processing apparatus is provided. The III-III arrow directional view of the hopper in the flocculant automatic supply apparatus of FIG. The top view of the hopper of FIG. The figure explaining the characteristic of the line mixer for acceleration | stimulation of agglomeration reaction with the muddy water processing apparatus by one Embodiment of this invention. Explanatory drawing of the twist of a baffle plate in a line mixer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Turbid water treatment apparatus 12 Raw water tank 14 Solid-liquid separation apparatus 15 Neutralization treatment apparatus 16 Coagulant tank 17 Coagulant tank 18 Coagulant automatic replenishment apparatus 19 Auxiliary tank 24 Neutralization line mixer 30 Dissolution stirring tank 32 Hopper 34 Stirring apparatus 38 Screw feeder 60a, 60b Line mixer 80 Retention tank 82 Drum screen

Claims (12)

In muddy water treatment equipment for treating muddy water generated in civil engineering and construction work,
Neutralizing the neutralized turbid water by blowing carbon dioxide into the turbid water;
A flocculant tank for storing the flocculant solution;
A flocculant automatic replenishing device that automatically performs a series of steps from the measurement and dissolution of the flocculant to the automatic replenishment of the flocculant solution into the flocculant tank;
A flocculant having a spiral line mixer that stirs and mixes the flocculant charged from the flocculant tank and turbid water, aggregates suspended matter in the turbid water, and promotes floc formation reaction;
A muddy water treatment apparatus comprising: A flocculation device installed in a turbid water treatment device for treating turbid water generated in civil engineering and construction work, for mixing flocculant with the turbid water, flocculating suspended matter in the turbid water, and promoting floc formation,
In the middle of the turbid water treatment pipe through which the mixed liquid of turbid water and coagulant flows, a line mixer in which a baffle plate extends in a spiral shape is incorporated in the inner peripheral portion of the pipe body, and the inner diameter of the line mixer is made larger than the inner diameter of the line mixer inlet. A flocculation apparatus for a turbid water treatment apparatus.   The baffle of the muddy water treatment apparatus according to claim 2, wherein the baffle plate of the line mixer is composed of two baffle plates that twist in the left and right directions while forming a passage space in the center of the tube. .   The turbid water treatment pipe is formed by connecting the plurality of line mixers in series, and an inner diameter of an outlet portion of the upstream line mixer is larger than an inner diameter of an inlet portion of the downstream line mixer. Item 4. A coagulation apparatus for a muddy water treatment apparatus according to item 2 or 3. A hopper for charging a powdery flocculant used for turbid water treatment, and a dissolution agitation tank for dissolving the flocculant supplied from the hopper in water. In the flocculant automatic replenishment device that replenishes the flocculant tank of the device,
A stirring device for stirring the flocculant and water supplied to the dissolution stirring tank;
A metering unit for metering the flocculant from the hopper and supplying it to the dissolution tank;
A water supply solenoid valve for opening and closing a flow path for supplying water to the dissolution and stirring tank;
Water supply level detection means for detecting the level of the liquid level supplied to the dissolution stirring tank;
A flocculant level detection means for detecting the liquid level of the flocculant solution replenished in the flocculant tank;
A transfer solenoid valve for opening and closing a flow path for supplying a flocculant solution from the dissolution stirring tank to the flocculant tank;
In accordance with a change in the liquid level of the flocculant solution in the dissolution agitation tank and the liquid level of the flocculant, the metering unit and the stirring device are started and stopped according to a predetermined sequence, and a solenoid valve for water supply And a controller for controlling the opening / closing operation of the coagulant solenoid valve,
A flocculant automatic replenishment device for a muddy water treatment device, comprising: The weighing unit is
A screw feeder disposed in a weighing port at the bottom of the hopper;
First clogging preventing means for preventing clogging of the flocculant at the inlet of the screw feeder;
Second clogging preventing means for preventing clogging of the flocculant at the outlet of the screw feeder;
The flocculant automatic replenishment device of the muddy water treatment device according to claim 5, comprising:   The flocculant automatic replenishing device for a turbid water treatment apparatus according to claim 6, wherein the first clogging prevention means comprises a stirrer having blades attached to a shaft parallel to the screw feeder.   The flocculant automatic replenishing device for a turbid water treatment apparatus according to claim 6, wherein the second clogging prevention means comprises air blow means for jetting air toward an outlet portion of the screw feeder.   6. The flocculant automatic replenishing device for a turbid water treatment apparatus according to claim 5, wherein the stirring device of the dissolution stirring tank has punch metal type stirring blades having a number of holes punched out. A solid-liquid separation device that is provided in a muddy water treatment device for treating muddy water generated in civil engineering and construction work, and separates floc condensed from suspended matter in muddy water mixed with a flocculant from muddy water,
A solid-liquid separator for a turbid water treatment apparatus, comprising a drum screen for supplying the turbid water to a rotating cylindrical screen, scooping out flocs and forcibly separating the floc into water and sludge.   The sludge removing means for forcibly removing sludge adhering to the screen surface as the floc scooped out from the muddy water is solidified by blowing air onto the screen of the drum screen portion. Solid-liquid separation device for turbid water treatment equipment.   On the inlet side of the drum screen part, a stagnant tank for agglomeration of suspended matter in muddy water progresses and a sufficiently grown flock is arranged in parallel, and muddy water containing foreign matter sufficiently flocked from the stagnant tank is provided. It supplies to the said drum screen part, The solid-liquid separation apparatus of the muddy water processing apparatus of Claim 10 characterized by the above-mentioned.

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