JP2010207670A - Device for treating turbid water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for treating turbid water which can reduce equipment cost and also, flocculate and sediment a turbid component rapidly and efficiently with the help of an added flocculating/sedimenting agent by efficiently stirring the turbid water of a stirring tank, while saving power consumption. <P>SOLUTION: This device for treating the turbid water includes the stirring tank 1 to which the turbid water is to be supplied, a drug feeder 2 for feeding the flocculating/sedimenting agent to the stirring tank 1, a forced stirring machine 3 for stirring the turbid water to which the flocculating/sedimenting agent is to be supplied, and a turbidity separation tank 4 for separating a flocculated turbid component from a liquid. The forced stirring machine 3 is arranged in the way that it extends vertically in the stirring tank 1 by an air lift pump 30 and has a vertical pipe 31 with a suction port 33 opened at the bottom of the stirring tank 1 and a discharge vent 34 on the upper part, and further, an air pump 32 for supplying numerous air bubbles to the vertical pipe 31. In addition, the device makes the ascending of the turbid water inside the vertical pipe 31 by numerous air bubbles to be supplied to the vertical pipe 31 from the air pump 32 to thereby forcibly stir the turbid water inside the stirring tank 1, and floculates the turbid water by the flocculating/sedimenting agent and then, supplies to the turbidity separation tank 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for separating muddy components from muddy water containing mud components and treating them into clean water, and in particular, used for separating muddy components from muddy water generated in civil engineering work and draining it as clear water. The present invention relates to a muddy water treatment apparatus.

  Muddy water generated by civil engineering work cannot be drained with mud components. The muddy water needs to be separated and drained as clear water. A processing device has been developed that adds flocculent precipitants such as bentonite to turbid water, agglomerates mud components with the coagulating precipitants to make it easy to settle, and separates flocs and separates them into clean water. Yes. (See Patent Document 1)

JP 2002-336602 A JP 2007-69104 A

  In the above processing apparatus, the turbid water to which the coagulating precipitant is added is stirred by a stirrer or a stirring pump in order to quickly coagulate the muddy water with the coagulating precipitant. The stirrer rotates the rotating blades with a motor to stir muddy water. The agitation pump is a submersible pump of a spiral pump that sucks muddy water from the bottom, drains it to the liquid level and agitates it. A stirrer that stirs turbid water with rotating blades has a drawback that the power consumption of the motor increases. In the stirrer, a motor is disposed above the liquid surface, and a rotating shaft connected to the motor is disposed in a vertical posture inside the stirring tank to fix the rotating blades. This rotating blade rotates and stirs the turbid water in the horizontal direction, and therefore has a drawback that the turbid water in the stirring tank cannot be effectively stirred at the bottom portion and the liquid surface portion. The stirring pump sucks muddy water from the bottom of the stirring tank and drains it to the top, so that the muddy water can be stirred at the bottom and liquid surface of the stirring tank, but in order to effectively stir the muddy water of the entire stirring tank, When the flow rate of the submersible pump is increased, the power consumption of the submersible pump increases, and there is a drawback that the equipment cost and running cost are increased. In addition, the stirrer and the agitation pump have a drawback that the rotating blades, the impeller, and the casing are worn and the life is short. This is because the main component is silica or alumina, which is an inorganic powder that is so hard that the mud component contained in muddy water is used in the abrasive. When a mud component containing silica or alumina used in the polishing agent collides with the inner surface of the rotary blade, impeller, or casing and rubs the surface, the wear increases.

  Furthermore, since the rotating blades of the stirrer simply stir the agglomerated precipitation agent and turbid water by physically rotating them, it is difficult to quickly and efficiently agglomerate mud components as flocs with the aggregation precipitation agent. In order to flocculate the muddy water quickly to form a floc, a large amount of flocculating precipitant is added, so that there is a disadvantage that the running cost becomes high. If the addition amount of the coagulating sedimentation agent is reduced in order to reduce the running cost, the sludge cannot be coagulated / precipitated quickly, so in reality, the addition amount of these coagulating precipitation agents cannot be reduced.

  Since the processing apparatus of Patent Document 2 is provided with an ejector mechanism on the discharge side of the agitation pump and injects countless bubbles, it can effectively agitate turbid water and the coagulating precipitant as compared with the rotating blades. However, this structure requires a submersible pump and a compressor, and further has an ejector mechanism, so there is a drawback that the equipment cost and running cost are extremely high.

The present invention has been developed for the purpose of solving the above drawbacks. An important object of the present invention is to reduce the equipment cost and reduce the power consumption while efficiently stirring the turbid water in the agitation tank, and the turbid water capable of quickly agglomerating the turbid components into flocs with the added aggregating precipitant. It is in providing a processing apparatus.
Another important object of the present invention is an apparatus for treating turbid water that can efficiently and quickly aggregate flocculated components into flocs with the added flocculating precipitant while reducing the amount of flocculating precipitant added. Is to provide.

Means for Solving the Problems and Effects of the Invention

  The turbid water treatment apparatus of the present invention includes a stirring tank 1 to which turbid water is supplied, a drug supply device 2 for supplying a coagulating precipitant to the stirring tank 1, and turbid water to which the coagulating precipitating agent is supplied. The forced agitator 3 for aggregating the turbid component of the turbid water with the aggregating precipitant and the turbid water agglomerated of the turbid component supplied by the forced agitator 3 is supplied to separate the agglomerated turbid component from the liquid. And a turbid separation tank 4. The forced agitator 3 is an air lift pump 30, and this air lift pump 30 is arranged in the stirring tank 1 so as to extend vertically, and has a suction port 33 at the bottom of the stirring tank 1 and a discharge port 34 at the top. And an air pump 32 that supplies countless air bubbles to the rising pipe 31 to increase the turbid water in the rising pipe 31 with a reduced specific gravity. The processing apparatus is configured to lift the turbid water in the ascending pipe 31 with the innumerable bubbles supplied from the air pump 32 to the ascending pipe 31 and forcibly agitate the turbid water in the agitation tank 1 to agglomerate with the aggregating precipitation agent. The turbid separation tank 4 is supplied.

  The above turbid water treatment apparatus reduces the equipment cost and efficiently agitate the turbid water in the agitation tank with an air lift pump while reducing power consumption, and quickly agglomerates the turbid components with the aggregating precipitant to be added. There are features that can be done. In the above processing apparatus, the forced agitator is used as an air lift pump, and this air lift pump raises the turbid water in the ascending pipe with countless bubbles supplied from the air pump to the ascending pipe. This is because the water is forcibly stirred. The forced agitator, which is an air lift pump, does not require complicated parts such as a submersible motor and a screw, and uses a riser pipe that is a simple cylinder, so that the equipment cost can be reduced as an extremely simple structure. In addition, the forced agitator, which is an air lift pump, can efficiently agitate the liquid in the agitation tank with an air pump that supplies air to the ascending pipe, and thus can be operated economically with less power consumption. By the way, according to the experiment of the present inventor, when turbid water in a stirring tank having a water depth of about 1 meter was stirred with an air lift pump and a submersible pump, a flow rate comparable to that of a 400 W submersible pump was obtained. It was possible to realize with an air pump consisting of a type pump.

  In particular, a forced agitator that is an air lift pump does not cause a failure due to abrasion that turbid components contained in muddy water collide with rotating blades, impellers, and the like, such as underwater motors and screws. For this reason as well, an air lift pump that forcibly stirs turbid water is extremely effective as a forcible stirrer for this type of processing apparatus that stirs turbid water containing turbid components. Therefore, the processing apparatus of the present invention can realize features that can be used stably over a long period of time while simplifying maintenance.

  Furthermore, the treatment apparatus of the present invention is capable of efficiently forcibly stirring the turbid water in the agitation tank with a forced agitator that is an air lift pump. It is also possible to realize a feature that enables turbid components to be efficiently and quickly aggregated into flocs and efficiently separated.

In the turbid water treatment apparatus according to the present invention, the medicine supply device 2 includes a chemical liquid pump 22 that supplies a liquid coagulating precipitant to the ascending pipe 31 of the air lift pump 30, and is supplied to the ascending pipe 31 by the chemical liquid pump 22. The coagulating precipitating agent can be forcibly stirred in the turbid water by raising the inside of the ascending pipe 31.
In the above processing apparatus, the liquid coagulating precipitant supplied from the drug supplier is supplied to the ascending pipe by the chemical pump, mixed with the turbid water rising in the ascending pipe and forcibly stirred. It is characterized by being able to flocculate turbid components quickly by mixing with turbid water efficiently.

In the turbid water treatment apparatus of the present invention, the chemical supply device 2 includes a chemical liquid pump 22 that supplies a liquid coagulating precipitant to the air pipe 35 that connects the air pump 32 to the ascending pipe 31. Therefore, the coagulating precipitation agent supplied to the rising pipe 31 via the air pipe 35 can be forcedly stirred into the turbid water by raising the inside of the rising pipe 31.
In the above processing apparatus, the chemical supply device supplies the liquid coagulating precipitant with the chemical liquid pump to the air pipe connected to the riser pipe and mixes it with the turbid water rising in the riser pipe. Since it is forcibly stirred, the liquid coagulating precipitant can be efficiently mixed with turbid water to quickly coagulate turbid components.

In the turbid water treatment apparatus of the present invention, the drug supply device 2 includes a powder supply device 25 that supplies a powdered coagulating precipitant to the ascending tube 31 of the air lift pump 30. The coagulating precipitant supplied to the water can be forcibly stirred in the turbid water by raising the inside of the riser 31.
In the above processing apparatus, the powdery coagulating precipitant supplied from the drug supplier is supplied to the ascending pipe by the powder feeder, mixed with the turbid water rising in the ascending pipe and forcibly stirred. The precipitant is efficiently mixed with turbid water to quickly aggregate turbid components.

In the turbid water treatment apparatus of the present invention, the drug supplier 2 includes a powder feeder 25 that supplies a powdered coagulating precipitant to an air pipe 35 that connects an air pump 32 to a riser pipe 31. The coagulating precipitant supplied to the ascending pipe 31 via the air pipe 35 by the feeder 25 can be forcibly stirred into the turbid water by raising the inside of the ascending pipe 31.
In the above processing apparatus, the drug supply device supplies the powdered coagulating precipitant with the powder supply machine to the air pipe supplying the air pump to the riser pipe, and mixes it with the turbid water rising in the riser pipe Then, the forced stirring is carried out, so that the powdery coagulating precipitant can be efficiently mixed with turbid water to quickly coagulate turbid components.

The muddy water treatment apparatus of the present invention can open or discharge the discharge port 34 at the tip by bending or bending the upper end of the ascending pipe 31 from the vertical direction to the horizontal direction.
In the above turbid water treatment device, the rising pipe for transferring turbid water discharges the turbid water sucked from the bottom of the stirring tank in the horizontal direction at the top of the stirring tank, so that it flows so as to convect the turbid water in the stirring tank inside. Can be forcibly stirred.

  In the turbid water treatment apparatus of the present invention, the coagulating precipitation agent supplied by the drug supplier 2 can be bentonite, a mixture of aluminum sulfate and a cationic starch acrylamide polymer, and sodium thiosulfate.

  In the turbid water treatment apparatus of the present invention, the drug supplier 2 can supply bentonite to the turbid water at a concentration of 5 ppm to 1000 ppm.

  In the turbid water treatment apparatus of the present invention, the drug supplier 2 can supply a mixture of aluminum sulfate and a cationic starch acrylamide polymer to the turbid water at a concentration of 5 ppm to 1000 ppm.

  In the turbid water treatment apparatus of the present invention, the drug supplier 2 can supply 2 ppm to 250 ppm of an aqueous sodium thiosulfate solution to the turbid water.

In the turbid water treatment apparatus according to the present invention, the turbid separation tank 4 separates the turbid components by the precipitation tank 5 supplied with the turbid water supplied with the coagulating precipitant in the stirring tank 1 and the waste water of the precipitation tank 5 being introduced. Separating tank 6 to be provided. In this processing apparatus, the sedimentation tank 5 includes a flow regulating plate 41 made of a perforated plate that allows turbid water to flow in, and the flow straightening plate 41 is arranged in a vertical posture so as to separate the precipitation tank 5 into an inflow side and a drainage side. The turbid water flowing in from the agitation tank 1 can be transmitted through the rectifying plate 41 and transferred to the drain side.
The turbid water treatment apparatus described above transmits turbid water mixed with the coagulating precipitation agent in the stirring tank to the rectifying plate in the turbid separation tank, transfers it to the drain side, causes it to coagulate and precipitate, and turbid water in the separation tank. Since the components are separated, the turbid components aggregated and precipitated by the coagulating precipitant can be separated quickly and efficiently.

It is a schematic block diagram of the muddy water processing apparatus concerning one Example of this invention. It is a schematic block diagram of the muddy water processing apparatus concerning the other Example of this invention. It is a schematic block diagram of the muddy water processing apparatus concerning the other Example of this invention. It is a perspective view which shows an example of the partition plate of a stirring tank. It is sectional drawing which shows the forced stirrer of the processing apparatus of muddy water shown in FIG. It is sectional drawing which shows another example of a forced stirrer. It is sectional drawing which shows an example of the chemical | medical agent supply apparatus which supplies a coagulating precipitation agent to an air lift pump. It is sectional drawing which shows another example of the chemical | medical agent supply apparatus which supplies a coagulating precipitation agent to an air lift pump. It is sectional drawing which shows another example of the chemical | medical agent supply apparatus which supplies a coagulating precipitation agent to an air lift pump.

  Embodiments of the present invention will be described below with reference to the drawings. However, the Example shown below illustrates the muddy water processing apparatus for actualizing the technical idea of this invention, Comprising: This invention does not specify the muddy water processing apparatus to the following.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The turbid water treatment apparatus shown in FIGS. 1 to 3 includes an agitation tank 1 to which turbid water is supplied, a drug supplier 2 for supplying an agglomerated precipitating agent to the agitation tank 1, and A forced agitator 3 for agitating the supplied turbid water to agglomerate the turbid component of the turbid water with an aggregating precipitant, and a turbid component agglomerated by the agitation of the turbid component agitated by the forced agitator 3 And a turbid separation tank 4 for separating the liquid from the liquid.

  The agitation tank 1 causes the turbid components contained in the supplied turbid water to agglomerate with an aggregating precipitating agent and discharge. The agitation tank 1 is supplied with the coagulating precipitant from the drug supplier 2 and mixed with the turbid water, and forcibly agitates the turbid water mixed with the coagulating precipitant to remove the turbid component contained in the muddy water. Aggregate with.

  In the stirring tank 1, a supply pipe 10 to which muddy water is supplied is arranged on the inflow side. The supply pipe 10 shown in the drawing is arranged extending vertically on the side wall on the inflow side of the stirring tank 1, and the discharge port 11 provided at the lower end is arranged at the bottom of the stirring tank 1. The supply pipe 10 discharges turbid water flowing in from the supply unit 12 from a discharge port 11 disposed at the bottom of the stirring tank 1 and supplies the muddy water to the bottom of the stirring tank 1.

  The stirring tank 1 of FIG. 1 is divided into a first chamber 1A, a second chamber 1B, and a third chamber 1B by a partition plate 15 inside. The partition plate 15 extends from the bottom surface of the stirring tank 1 to the upper part and is fixed. The agitation tank 1 overflows the partition plate 15 and transfers muddy water to the next chamber. The muddy water overflows the first chamber 1A and flows into the second chamber 1B, and further overflows the second chamber 1B and flows into the third chamber 1B. Further, the muddy water overflows from the third chamber 1B and flows into the muddy separation tank 4. However, the turbid water stirred in each chamber can be supplied to the next chamber or turbid separation tank with a pump or the like. The internal volumes of the first chamber 1A, the second chamber 1B, and the third chamber 1B of the stirring tank 1 are designed to have a capacity capable of storing, for example, 10 tons of muddy water. The agitation tank 1 can treat 100 to 200 tons of muddy water per hour. The processing apparatus with a small amount of muddy water can reduce the volume of the stirring tank 1. The internal volume of the stirring tank 1 is set to 1/10 to 1/20 of the capacity of turbid water to be treated for 1 hour.

  As described above, the processing apparatus that divides the inside of the stirring tank 1 into the first chamber 1A, the second chamber 1B, and the third chamber 1B by the partition plate 15 includes the forced stirrer 3 in each stirring tank 1. Thus, the turbid water supplied in each chamber can be forcibly stirred, and different types of coagulating precipitation agents can be supplied to the respective stirring tanks 1. However, the stirring tank 1 can be divided into a first chamber 1A and a second chamber 1B by a partition plate 15 as shown in FIG. 2, or can be divided by a partition plate as shown in FIG. It can also be set as one stirring tank 1 without.

  The chemical supply device 2 supplies the coagulating precipitation agent to the turbid water supplied to the stirring tank 1. The medicine supply device 2 supplies a liquid coagulating precipitation agent to the stirring tank 1 or supplies a powdery coagulating precipitation agent to the stirring tank 1. The liquid coagulating precipitant may be a powder or solid coagulating precipitant dissolved in a liquid such as water, or a powder coagulating precipitant suspended in a liquid such as water. As shown in FIGS. 1 to 3, the drug supplier 2 that supplies the liquid coagulating precipitant to the stirring tank 1 includes a chemical tank 21 that stores the liquid coagulating precipitant, and a liquid that is stored in the chemical tank 21. The chemical solution pump 22 for supplying the coagulating precipitant to the stirring tank 1 and the flow meter 23 for detecting the flow rate of the coagulating precipitant supplied by the chemical solution pump 22 are provided. These chemical supply devices 2 detect the flow rate of the coagulating precipitation agent with a flow meter 23 and control the rotation speed of the chemical liquid pump 22 so that the supplied coagulating precipitation agent has a predetermined flow rate.

  The drug supplier 2 that supplies the powdered coagulating precipitant to the stirring tank 1 can be a powder supplier 25. A powder supply machine 25 shown in FIG. 2 supplies a powdery coagulating precipitant to the supply pipe 10 that supplies turbid water to the stirring tank 1. The supply pipe 10 shown in the figure has a T-shape formed by connecting a horizontal pipe 10B in the middle of the vertical pipe 10A. The horizontal pipe 10B serves as a muddy water supply unit 12 and the lower end of the vertical pipe 10A is disposed in the drainage. Thus, the discharge port 11 is provided, and a powder feeder 25 is provided at the upper end of the vertical tube 10A. The illustrated powder feeder 25 includes a hopper 26 for storing a powdery coagulating precipitant, and a rotary feeder 27 for controlling the supply amount of the coagulating precipitant supplied from the hopper 26. The powder feeder 25 also controls the rotational speed of the rotary feeder 27 so that the amount of the coagulating precipitant supplied to the turbid water becomes a predetermined amount. Thus, the structure for supplying the powdered coagulating precipitant to the supply pipe 10 has a feature that the powdered coagulating precipitant can be reliably mixed with the muddy water by the water flow of the muddy water supplied to the supply pipe 10.

  The above-described chemical supply device 2 controls the supply amount so that the aggregated precipitant to be supplied has a predetermined concentration with respect to the turbid water supplied to the stirring tank 1. The processing apparatus of FIGS. 1 to 3 is provided with a flow rate measuring unit 16 on the partition plate 15 as shown in FIG. 4 in order to measure the flow rate of muddy water. The flow rate measuring unit 16 shown in the figure is a V groove 17 provided at the upper end of the partition plate 15 and measures the flow rate of muddy water from the height of the water surface that overflows and passes through the V groove 17. Based on the flow rate of turbid water measured by the flow rate measurement unit 16, the medicine supply device 2 controls the supply amount of the coagulating precipitating agent so that the coagulating precipitating agent to be supplied has a predetermined concentration. However, the flow rate of turbid water supplied to the stirring tank 1 can also be measured with a flow meter. The processing apparatus shown in FIG. 2 is provided with a flow meter 13 for measuring the flow rate of supplied turbid water in a supply pipe 10 provided on the inflow side of the stirring tank 1. This processing apparatus inputs the flow rate of turbid water measured by the flow meter 13 into the drug supplier 2 and controls the supply amount of the coagulating sedimentation agent based on this flow rate.

  Bentonite, a mixture of aluminum sulfate and a cationic starch acrylamide polymer, and sodium thiosulfate are used as the coagulating precipitant supplied by the drug supplier 2. However, as the coagulating precipitant, any inorganic or organic coagulating precipitant that can coagulate and precipitate muddy water containing a mud component can be used. These coagulating precipitants are supplied so as to have a predetermined concentration with respect to the supplied turbid water. Therefore, the chemical solution supply device 2 supplies the coagulating precipitant so as to have a predetermined concentration. The chemical solution supply device 2 that supplies a plurality of coagulating precipitants supplies the coagulating precipitant from each of the chemical supply devices 2 at a predetermined rate. The medicine supply device 2 supplies the coagulating sedimentation agent to a predetermined concentration with respect to the supplied turbid water. As shown in FIG. 1, in the insertion of supplying different coagulating / precipitating agents with the first to third drug supply devices 2, each chemical solution supplying device 2 supplies the coagulating / precipitating agent at a predetermined ratio. The drug supply device 2 shown in the figure includes a first drug supply device 2A that supplies bentonite to muddy water, a second drug supply device 2B that supplies a mixture of aluminum sulfate and a cationic starch acrylamide polymer, and sodium thiosulfate. And a third medicine supply device 2C for supply.

  The first drug supplier 2 </ b> A supplies bentonite to the stirring tank 1. The first chemical supplier 2A controls the supply amount of bentonite so that the bentonite concentration contained in the turbid water in the stirring tank 1 is 500 ppm. However, the supply amount of bentonite is set to an optimum value in consideration of the content of turbid components. When the content of turbid components increases, the amount of bentonite supplied is increased to increase the bentonite concentration in turbid water. Therefore, the bentonite concentration supplied to the stirring tank 1 is set in the range of 5 ppm to 10000 ppm.

  The 2nd chemical | medical agent supply apparatus 2B supplies the mixture of an aluminum sulfate and a cationic starch acrylamide polymer to the stirring tank 1. FIG. The second chemical supplier 2B controls the supply amount of the mixture of aluminum sulfate and cationic starch acrylamide polymer so that the mixture concentration of aluminum sulfate and cationic starch acrylamide polymer contained in the turbid water in the stirring tank 1 is 500 ppm. To do. The supply amount of the mixture of aluminum sulfate and cationic starch acrylamide polymer is also set to an optimum value in consideration of the content of turbid components. When the content of the turbid component increases, the supply amount of the mixture of aluminum sulfate and the cationic starch acrylamide polymer is increased to increase the concentration of the mixture of aluminum sulfate and the cationic starch acrylamide polymer in the turbid water. Therefore, the mixture concentration of the aluminum sulfate and cationic starch acrylamide polymer supplied to the stirring tank 1 is set in the range of 5 ppm to 10000 ppm.

  The 3rd chemical | medical agent supply apparatus 2C supplies 25% sodium thiosulfate aqueous solution to the stirring tank 1. FIG. The 3rd chemical | medical agent supply device 2C controls the supply amount of sodium thiosulfate aqueous solution so that the sodium thiosulfate density | concentration contained in the muddy water of the stirring tank 1 may be 125 ppm. The supply amount of the sodium thiosulfate aqueous solution is also set to an optimum value in consideration of the content of turbid components. When the content of the turbid component increases, the supply amount of sodium thiosulfate is increased to increase the sodium thiosulfate concentration in the turbid water. Therefore, the amount of sodium thiosulfate supplied to the stirring tank 1 is set such that the sodium thiosulfate concentration is in the range of 2 ppm to 250 ppm.

  The processing apparatus of FIG. 1 adds liquid bentonite to turbid water in the first chamber 1A of the stirring tank 1 and stirs, and mixes a mixture of aluminum sulfate and a cationic starch acrylamide polymer into the turbid water in the second chamber 1B of the stirring tank 1. Add and stir, add sodium thiosulfate aqueous solution to the turbid water in the third chamber 1C of the stirring chamber 1 and stir. That is, in the second chamber 1B of the agitation tank 1, turbid water stirred by adding bentonite from the first chemical supply device 2A in the first chamber 1A flows into the second chemical supply device 2B. Then, the mixture of aluminum sulfate and cationic starch acrylamide polymer was added and stirred, and in the third chamber 1C, bentonite and turbid water added with the mixture of aluminum sulfate and cationic starch acrylamide polymer were introduced. The aqueous sodium thiosulfate solution is added to the muddy water from the third chemical supplier 2C and stirred.

  The processing apparatus of FIG. 2 adds powdered bentonite to the turbid water supplied to the first chamber 1A of the stirring tank 1, stirs it in the supply pipe 10, and then adds sulfuric acid to the turbid water in the second chamber 1B of the stirring tank 1. A mixture of aluminum and cationic starch acrylamide polymer and an aqueous sodium thiosulfate solution are added and stirred. That is, in the first chamber 1A of the agitation tank 1, turbid water that has been agitated by adding bentonite in the first chemical supply device 2A is introduced from the supply pipe 10, and the second chamber 1B is in which bentonite is added. Stirred turbid water is introduced, and a mixture of aluminum sulfate and cationic starch acrylamide polymer is added from the second drug supplier 2B, and a sodium thiosulfate aqueous solution is added from the third drug supplier 2C and stirred. The mixture of the aluminum sulfate and cationic starch acrylamide polymer supplied from the second drug supplier 2B and the sodium thiosulfate aqueous solution supplied from the third drug supplier 2C are mixed in the supply hose 24 and stirred. The tank 1 is supplied.

  The processing apparatus of FIG. 3 adds and stirs liquid bentonite, a mixture of aluminum sulfate and a cationic starch acrylamide polymer, and a sodium thiosulfate aqueous solution to the turbid water supplied to the stirring tank 1. That is, the stirring tank 1 adds bentonite to the turbid water supplied by the first drug supplier 2A, adds a mixture of aluminum sulfate and cationic starch acrylamide polymer to the second drug supplier 2B, The aqueous sodium thiosulfate solution is added and stirred with the chemical supply device 2C of No. 3. The liquid coagulating precipitant supplied from each chemical supply device 2 is mixed in the supply hose 24 and supplied to the stirring tank 1.

  The processing apparatus of FIGS. 1 to 3 is provided with a plurality of chemical solution feeders. However, in the apparatus for supplying one coagulating and precipitating agent to turbid water, A chemical solution feeder is provided. This processing apparatus sucks a liquid coagulating precipitant with a pump and supplies it to a riser pipe, a supply pipe or a stirring tank, or supplies a powdery coagulating precipitant with a riser pipe or a supply using the powder feeder shown in FIG. Supply to pipes and stirring tanks.

  As described above, the turbid water to which the coagulating precipitant supplied from the drug supplier 2 is added is stirred in the stirring tank 1. The stirring tank 1 is provided with a forced stirrer 3 for forcibly stirring the turbid water supplied with the coagulating precipitant. The forced agitator 3 in the figure is an air lift pump 30. The forced agitator 3 that is an air lift pump 30 is provided with a rising pipe 31 that is arranged so as to extend vertically in the stirring tank 1, and countless air bubbles are supplied to the rising pipe 31, And an air pump 32 that lowers the substantial specific gravity of the turbid water.

  As shown in FIG. 5, the ascending pipe 31 is disposed so as to extend from the bottom of the stirring tank 1 to the level of the turbid water, and the suction port 33 is opened at the bottom of the stirring tank 1 and the discharge port 34 is opened at the top. is doing. The ascending pipe 31 in FIG. 5 is fixed in a posture perpendicular to the side wall of the stirring tank 1 through the connecting arm 36. The ascending pipe 31 can raise and stir muddy water most efficiently in a vertical posture. However, since the riser can be arranged at an inclination to raise muddy water, it is not necessarily arranged in a vertical posture.

  The ascending pipe 31 of FIG. 5 has a lower end portion that is curved in the horizontal direction from the vertical direction, and has a suction port 33 at the tip. The ascending pipe 31 smoothly raises the muddy water sucked from the suction port 33 from the horizontal direction to the vertical direction. Further, the rising pipe 31 of FIG. 5 has an upper end portion that is curved from the vertical direction to the horizontal direction, and has a discharge port 34 at the tip. The ascending pipe 31 smoothly discharges the rising muddy water from the discharge port 34 from the vertical direction to the horizontal direction. For this reason, muddy water can be efficiently discharged in the horizontal direction. The rising pipe 31 has a lower end and an upper end that are curved with a predetermined radius of curvature so that muddy water can flow smoothly. The rising pipe 31 in the figure has a shape in which the lower end and the upper end are curved at approximately 90 degrees, but the rising pipe does not necessarily have to bend at the upper and lower ends at 90 degrees, and the angle is smaller than 90 degrees. Can be bent or bent, or can be bent or bent to an angle greater than 90 degrees. However, the rising pipe can be bent at the lower end or the upper end, or can be opened in the vertical direction without being bent or bent.

  Further, the rising pipe 31 of FIG. 5 is curved in the same direction at the lower end and the upper end so that the muddy water inside the stirring tank 1 can flow smoothly, and the suction port 33 and the discharge port 34 are set in the same direction. Open to face. The ascending pipe 3 shown in FIG. 5 is fixed to a side wall on one side of the agitation tank 1 and opens a suction port 33 and a discharge port 34 from the side wall toward the opposite side wall. The air lift pump 30 discharges muddy water sucked from the bottom toward one side of the ascending pipe 31, and efficiently agitates muddy water inside the agitation tank 1. In particular, as shown in FIG. 5, the ascending pipe 31 raises the muddy water sucked from the horizontal direction at the suction port 33 in the vertical direction, and discharges the rising muddy water from the vertical direction to the horizontal direction. 34 is discharged smoothly. Therefore, the turbid water in the agitation tank 1 can be sucked from the horizontal direction and discharged in the horizontal direction, and can be efficiently flowed and stirred as indicated by the arrows in FIG.

  The ascending pipe 31 shown in FIG. 6 has a pair of discharge ports 34 at the upper end for discharging liquid muddy water in different directions, in the drawing, in opposite directions. The ascending pipe 31 has a shape in which each discharge port 34 protrudes toward opposite sides. The ascending pipe 31 discharges and stirs the turbid water rising from the suction port 33 in the horizontal direction in opposite directions. Furthermore, the rising pipe 31 of FIG. 6 has a structure in which the lower part is connected to the bottom plate 37 so that it can stand upright in a vertical posture. The bottom plate 37 is a metal plate, and has a size and weight that allows the rising pipe 31 to stand by itself inside the stirring tank 1. The air lift pump 30 can be easily installed at the bottom of the stirring tank 1. The ascending pipe 31 is arranged away from the upper surface of the bottom plate 37 via the connecting arm 38, and the lower end is opened as the suction port 33. As shown in FIG. 6, this air lift pump is installed in the center part of the stirring tank 1, and can circulate muddy water as shown by the arrow, and can stir efficiently.

  The ascending pipe 31 is connected to an air pump 32 via an air pipe 35 at the bottom. The pressurized air supplied from the air pump 32 is supplied to the ascending pipe 31 via the air pipe 35. The air supplied to the ascending pipe 31 becomes innumerable bubbles and is jetted into the ascending pipe 31 to increase the specific gravity of the liquid in the ascending pipe 31 to increase. The air pump 32 is a pump that can supply pressurized air to the bottom of the ascending pipe 31, and a diaphragm pump is used. The air pump 32 pressurizes and supplies air to the high pressure at the bottom of the ascending pipe 31. Since the water depth is 1 m and the water pressure is 10 kPa, the agitation tank 1 having a maximum water depth of 1 m can supply liquid having a pressure higher than 10 kPa to the ascending pipe 31 to raise the liquid to the ascending pipe 31. For example, a diaphragm pump with a power consumption of 50 W has a discharge pressure of 11 kPa and an air flow rate of about 50 liters / minute. Therefore, using this diaphragm pump, the stirring tank 1 having a maximum water depth of 1 m is used. Muddy water can be efficiently stirred. However, a blower or a compressor can be used for the air pump 32. The blower is characterized in that the flow rate of supplied air can be increased. Moreover, since the compressor can raise discharge pressure, it can be used conveniently for the stirring tank with a deep maximum water depth.

  The air pump 32 can increase the discharge pressure as the water depth of the agitation tank 1 becomes deeper and can inject air into the rising pipe 31 in the form of bubbles. Therefore, the discharge pressure of the air pump 32 is set to an optimum value depending on the water depth of the stirring tank 1. Further, the air lift pump 30 can increase the flow rate of the rising liquid by increasing the discharge flow rate of the air pump 32 and increasing the inner diameter of the rising pipe 31. Therefore, the inner diameter of the ascending pipe 31, the discharge flow rate and the discharge pressure of the air pump 32 are set so as to be optimal for the application.

  FIG. 7 shows a state where the above air lift pump 30 sucks and discharges muddy water. The air lift pump 30 sucks turbid water stored in the stirring tank 1 from the suction port 33 at the lower end of the ascending pipe 31 and discharges it from the discharge port 34 at the upper end to forcibly stir the turbid water in the stirring tank 1. . The muddy water sucked from the suction port 33 rises while being forcibly stirred by countless bubbles inside the ascending pipe 31, and is discharged from the discharge port 34 at the upper end. Therefore, the air lift pump 30 raises the turbid water flowing into the ascending pipe 31 while forcibly stirring with countless bubbles, and flows the turbid water discharged from the discharge port 34 inside the stirring tank 1. And forcibly stir.

  The forced agitator 3 that is the air lift pump 30 can supply the aggregated precipitant supplied from the drug supplier 2 to the ascending pipe 31 and mix it with muddy water. In the processing apparatus shown in FIG. 7, the chemical supplier 2 is connected to the ascending pipe 31 to supply a liquid coagulating sedimentation agent to the bottom of the ascending pipe 31. The liquid flocculating precipitant supplied to the ascending pipe 31 from the medicine supplier 2 is forcibly stirred and mixed with muddy water in the process of ascending the ascending pipe 31. In the medicine supply device 2, a nozzle 29 is provided upward at the bottom of the ascending pipe 31, and the nozzle 29 is connected to the chemical liquid pump 22. In the medicine supply device 2, a liquid coagulating precipitant is jetted upward from a nozzle 29 and mixed with turbid water through a rising pipe 31.

  As shown in FIG. 8, the medicine supply device 2 can also supply a liquid coagulating precipitant in the middle of the air pipe 35. This medicine supply device 2 connects the supply hose 24 connected to the chemical pump 22 in the middle of the air pipe 35 and supplies the aggregated precipitant to the air pipe 35. In this medicine supply device 2, the coagulating precipitation agent is added to the air supplied to the ascending pipe 31. Therefore, the air and the coagulating precipitation agent are supplied together to the ascending pipe 31. Mixed in muddy water.

  Furthermore, as shown in FIG. 9, the drug supply device 2 can also connect the powder supply device 25 in the middle of the air pipe 35 as a powder supply device 25 that mixes the powdered coagulating precipitant with turbid water. . The powder feeder 25 includes a hopper 26 for storing a powdery coagulating precipitant and a rotary feeder 27 for controlling the supply amount of the coagulating precipitant supplied from the hopper 26, and discharging the rotary feeder 27. The side is connected to the air pipe 35 via the supply pipe 28. The powder feeder 25 sucks the powdered coagulating precipitant by the air ejector action in which the pressure is reduced by flowing through the air pipe 35 at high speed, and the sucked powder coagulating precipitant rises using air as a carrier gas. Supply to tube 31. This medicine supply device 2 can mix the coagulating precipitation agent with the liquid without using a pump or the like that forcibly supplies the coagulating precipitation agent to the ascending pipe 31. However, the powder feeder can forcibly supply the powdered coagulating precipitant to the ascending pipe 31 and mix it with muddy water. The powdery coagulating precipitant mixed with the turbid water is dissolved in the turbid water or uniformly dispersed without being dissolved.

  The above-described forced agitator 3 lifts the turbid water in the ascending pipe 31 with the countless bubbles supplied from the air pump 32 to the ascending pipe 31 to forcibly agitate the turbid water in the agitation tank 1. The turbid water that is forcibly stirred by the forced stirrer 3 is agglomerated with a coagulating precipitant and supplied to the turbid separation tank 4.

  The turbid separation tank 4 is supplied with the turbid water mixed and stirred in the agitation tank 1 to precipitate the agglomerated turbid components, and the precipitate in the precipitation tank 5 is supplied to become turbid. And a separation tank 6 for separating the components.

  The sedimentation tank 5 includes a rectifying plate 41 made of a perforated plate that allows turbid water to flow therethrough. The current plate 41 is arranged in a vertical posture so as to separate the sedimentation tank 5 into the inflow side and the drainage side. The rectifying plate 41 is a perforated plate having an aperture ratio of 5%, for example. This sedimentation tank 5 permeates the turbid water that overflows from the agitation tank 1 and flows into the flow straightening plate 41 and transfers it to the drain side. The sedimentation tank 5 shown in the figure has a plurality of rectifying plates 41 arranged in parallel at predetermined intervals. The sedimentation tank 5 allows the turbid water transferred from the inflow side to the drainage side to permeate the plurality of rectifying plates 41 to reduce the flow velocity, and can quickly aggregate and settle on the drainage side. However, the current plate can be a single sheet. Furthermore, the structure which arrange | positions the several baffle plate 41 in the sedimentation tank 5 can also adjust an aperture ratio by the inflow side and drainage side of muddy water. The plurality of rectifying plates 41 can effectively reduce the flow rate of muddy water transferred from the inflow side to the drainage side, for example, by increasing the aperture ratio on the muddy water inflow side and decreasing the aperture ratio on the drainage side. Accordingly, the settling tank 5 is transferred by adjusting the number and interval of the rectifying plates 41 and the opening ratio in consideration of the flow rate of muddy water flowing from the stirring tank 1 and the volume of the settling tank 5. The turbid water can quickly aggregate and settle on the drain side.

  The muddy water supplied to the inflow side of the settling tank 5 quickly permeates the rectifying plate 41 and aggregates and settles on the drain side. Aggregated and precipitated turbid components are deposited at the bottom of the settling tank 5. The turbid component precipitated at the bottom is supplied to the separation tank 6 by the transfer pump 42. The supernatant of the sedimentation tank 5 overflows and drains.

  The separation tank 6 has a structure in which a side surface is meshed to drain water. The separation tank 6 removes moisture contained in the precipitate supplied from the precipitation tank 5 and separates turbid components. Therefore, the separation tank 6 stores turbid components from which water has been separated.

The processing apparatus shown in FIG. 1 separates muddy water in the following steps.
(1) Muddy water is supplied to the first chamber 1A of the stirring tank 1 at a rate of 140 tons / hour. Bentonite is supplied to the first chamber 1A of the stirring tank 1 so that the bentonite concentration is 500 ppm. For the bentonite, Ecomax TW-20WB (Aisan Industry Co., Ltd., 378 Sannocho, Hamamatsu City, Shizuoka Prefecture) is used. Bentonite is supplied from the first drug supplier 2A to the ascending pipe 31 disposed in the first chamber. The bentonite supplied to the ascending pipe 31 rises inside the ascending pipe 31 and is forcibly stirred by the muddy water.

(2) Overflow from the first chamber 1A of the stirring tank 1 and supply turbid water to which bentonite is added to the second chamber 1B of the stirring tank 1. The second chamber 1B of the stirring tank 1 is supplied with a mixture of aluminum sulfate and a cationic starch acrylamide polymer so that the concentration of the mixture of aluminum sulfate and the cationic starch acrylamide polymer is 500 ppm. For the mixture of aluminum sulfate and cationic starch acrylamide polymer, Ecomax TW-20W08 (Aisan Industry Co., Ltd., 378 Sannocho, Hamamatsu City, Shizuoka Prefecture) is used. The mixture of the aluminum sulfate and the cationic starch acrylamide polymer is supplied from the second chemical supplier 2B to the ascending pipe 31 disposed in the second chamber 1B of the stirring tank 1. The mixture of aluminum sulfate and cationic starch acrylamide polymer supplied to the ascending pipe 31 rises inside the ascending pipe 31 and is forcibly stirred in turbid water.

(3) The turbid water is caused to flow into the third chamber 1 </ b> C of the stirring tank 1 by overflowing from the second chamber 1 </ b> B of the stirring tank 1. Sodium thiosulfate is supplied to the third chamber 1C of the stirring tank 1 so that the sodium thiosulfate concentration is 125 ppm. As the sodium thiosulfate aqueous solution, a 25% sodium thiosulfate aqueous solution in which sodium thiosulfate is dissolved in water is used.

(4) The turbid water is caused to overflow from the stirring tank 1 and flow into the precipitation tank 5. In the precipitation tank 5, turbid components are aggregated and precipitated.

(5) The turbid component precipitated in the sedimentation tank 52 is supplied to the separation tank 6 by the transfer pump 42, and water is separated in the separation tank 6 to separate the turbid component.

  With the above method, the amount of bentonite and sodium thiosulfate can be reduced, and the turbid components can be separated from turbid water quickly and efficiently using the stirring tank 1 having a volume of 10 tons.

1 ... Agitation tank 1A ... First chamber
1B ... Second room
1C ... 3rd chamber 2 ... Drug supply device 2A ... First drug supply device
2B ... Second medicine supply device
2C ... 3rd chemical | medical agent supply device 3 ... Forced stirrer 4 ... Turbid separation tank 5 ... Precipitation tank 6 ... Separation tank 10 ... Supply pipe 10A ... Vertical pipe
DESCRIPTION OF SYMBOLS 10B ... Horizontal pipe 11 ... Discharge port 12 ... Supply part 13 ... Flow meter 15 ... Partition plate 16 ... Flow rate measurement part 17 ... V groove 21 ... Chemical liquid tank 22 ... Chemical liquid pump 23 ... Flow meter 24 ... Supply hose 25 ... Powder feeder 26 ... Hopper 27 ... Rotary feeder 28 ... Supply pipe 29 ... Nozzle 30 ... Air lift pump 31 ... Rising pipe 32 ... Air pump 33 ... Suction port 34 ... Discharge port 35 ... Air piping 36 ... Connecting arm 37 ... Bottom plate 38 ... Connection Arm 41 ... Rectifying plate 42 ... Transfer pump

Claims (11)

An agitation tank (1) to which turbid water is supplied, a chemical supply device (2) for supplying the coagulating precipitation agent to the agitation tank (1), and turbid water to which the aggregation precipitation agent is supplied by the chemical supply device (2). A forced stirrer (3) that stirs and aggregates the turbid component of the turbid water with a coagulating precipitant, and the turbid component that has been agglomerated and stirred with this forced stirrer (3) is supplied to the liquid. A turbid water treatment apparatus comprising a turbid separation tank (4) for separating from,
The forced agitator (3) is an air lift pump (30), and this air lift pump (30) is arranged so as to extend vertically, and the suction port (33) is discharged to the top at the bottom of the stirring tank (1). An ascending pipe (31) opening the outlet (34), and supplying a myriad of air bubbles to the ascending pipe (31) to lower the actual specific gravity of the turbid water in the ascending pipe (31) and raise it. An air pump (32),
With countless bubbles supplied from the air pump (32) to the riser pipe (31), the turbid water in the riser pipe (31) is raised to forcibly agitate the turbid water in the agitation tank (1). An apparatus for treating turbid water which is aggregated with a coagulating sedimentation agent and supplied to the turbid separation tank (4).   The drug supply device (2) includes a chemical liquid pump (22) for supplying a liquid coagulating precipitant to the ascending pipe (31) of the air lift pump (30). With this chemical liquid pump (22), The turbid water treatment apparatus according to claim 1, wherein the coagulating sedimentation agent supplied to the riser pipe (31) rises in the riser pipe (31) and is forcibly stirred by the turbid water.   The medicine supply device (2) includes a chemical liquid pump (22) for supplying a liquid coagulating precipitant to an air pipe (35) connecting the air pump (32) to the rising pipe (31). In this chemical pump (22), the coagulating precipitation agent supplied to the ascending pipe (31) via the air pipe (35) rises in the ascending pipe (31) and is forcibly stirred into turbid water. The turbid water treatment apparatus according to claim 1 formed as described above.   The drug supply device (2) includes a powder supply device (25) for supplying a powdered coagulating precipitant to the ascending pipe (31) of the air lift pump (30), and this powder supply device (25) Accordingly, the turbid water treatment apparatus according to claim 1, wherein the coagulating precipitant supplied to the ascending pipe (31) rises in the ascending pipe (31) and is forcibly stirred by the turbid water. .   The drug supply device (2) includes a powder supply machine (25) for supplying a powdery coagulating precipitant to an air pipe (35) connecting the air pump (32) to the ascending pipe (31). With this powder feeder (25), the coagulating precipitant supplied to the riser pipe (31) via the air pipe (35) rises in the riser pipe (31) and is forced into turbid water. The turbid water treatment apparatus according to claim 1, wherein the turbid water treatment apparatus is agitated.   The turbid water treatment apparatus according to claim 1, wherein an upper end of the ascending pipe (31) is bent or bent in a horizontal direction from an up-down direction, and a discharge port (34) is opened at a tip end.   2. The turbid water treatment apparatus according to claim 1, wherein the coagulating precipitating agent supplied by the drug supplier (2) is bentonite, a mixture of aluminum sulfate and a cationic starch acrylamide polymer, and sodium thiosulfate.   The turbid water treatment apparatus according to claim 7, wherein the chemical supplier (2) supplies bentonite to the turbid water at a concentration of 5 ppm to 1000 ppm.   The treatment apparatus for turbid water according to claim 7, wherein the chemical supplier (2) supplies the turbid water with a mixture of aluminum sulfate and a cationic starch acrylamide polymer at a concentration of 5 ppm to 1000 ppm.   The treatment apparatus for turbid water according to claim 7, wherein the chemical supply device (2) supplies the aqueous solution of sodium thiosulfate to the turbid water at a concentration of 2 ppm to 250 ppm. The turbid separation tank (4) is a settling tank (5) to which turbid water supplied with a coagulating precipitant is supplied in the stirring tank (1), and drainage from the settling tank (5) is introduced to remove turbid components. A separation tank (6) for separation,
The settling tank (5) includes a flow straightening plate (41) made of a perforated plate that allows the inflowing wastewater to pass through, and the flow straightening plate (41) separates the settling tank (5) into an inflow side and a drainage side. The turbid water treatment apparatus according to claim 1, wherein the turbid water treatment apparatus is disposed in a vertical posture in such a manner as to pass the waste water flowing from the stirring tank (1) through the flow straightening plate (41) and transfer it to the waste water side.

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