JPS5927239B2 - Mud water treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for treating muddy water generated during civil engineering construction work and the like.

In the cast-in-place pile construction method, underground continuous wall construction method, mud water pressure shield construction method, etc., bainite mud water is circulated and used as a stabilizing liquid.

This stabilizer not only protects the walls of the drilled hole, but also acts as a medium to suspend the excavated soil and carry it out of the hole, so the concentration of mud increases as the drilling progresses. , and deteriorated due to the components of the poured concrete after excavation.

Therefore, when implementing the muddy water construction method, a certain amount of highly concentrated muddy water is drawn out through a circulation system, and fresh water is added to replace the drawn-out amount to adjust the density and treat the overflowing muddy water.

However, waste mud water such as drawn mud water and overflow mud water contains a large amount of fine clay, so if it is discharged as is, it will cause pollution problems such as sewer blockage and water pollution.

As a countermeasure against this problem, muddy water treatment is being carried out in which a flocculant is mixed with the waste muddy water to cause a flocculation reaction, the separated solids are sedimented or dehydrated and then dumped, and only the remaining fresh water is discharged.

The most important step in such treatment is the step of separating solids and liquids from muddy water.

As a specific means or method, conventionally,
As shown in Fig. 1, the mud water pipe 50 from the mud water tank is connected to the flow tank
1 and overflows into this downstream tank 51 52
Starting from this point, several stages of downstream plates 53 a s 53 b , 53 c descend alternately toward opposite sides of the tank.
-53d, and above the uppermost flow plate 53a and the middle flow plate 53b, chemical liquid supply pipes 55 and 56 with several dripping parts 54 are installed horizontally, and the liquid is supplied from the mud water pipe 50 and overflows. Two kinds of chemical solutions are dripped into the waste mud water flowing out from 51, and then the lower flow plate 53bs53c.

A configuration was adopted in which the aggregation reaction occurred while flowing through 53d.

However, in this method, the chemical solution is simply added to the waste mud water that flows down the flow plate in the form of a film, making it difficult to perform stirring and mixing, which is important for promoting the reaction, quickly and uniformly.
In other words, reactions often begin when they reach the lower flow plate, and as a result, unreacted chemicals often flow into the settling tank along with muddy water and are discharged as supernatant clean water, or unseparated sediment is discharged. In addition, due to the low reaction rate and long reaction time, a large capacity flow tank or muddy water storage tank is required to treat the large amount of waste muddy water generated, resulting in high equipment costs and a large installation space. was there.

The present invention aims to eliminate the drawbacks of the conventional devices described above and to provide a muddy water treatment device that has a relatively simple and compact configuration and is capable of separating solid and liquid in muddy water very effectively. .

For this purpose, the present invention provides a raw water piping system with a reaction tank with a stepped plate inside, and a raw water pipe with a spout at the tip inserted deep into the tank. A chemical feed pipe from the chemical solution tank was connected to an appropriate location, and a take-out pipe was provided at a location opposite to the spout of the reaction tank to communicate with the sedimentation concentration tank through or without the downstream reaction tower, and the chemical solution was added to the waste mud water. The liquid is jetted deep into the tank, and the chemical liquid and mud are mixed uniformly and rapidly by colliding with the tank wall and spreading, and the liquid is forcibly stirred by flowing oil at various places in the tank while flowing through the tank. mix,
This method allows an effective aggregation reaction to be achieved in an extremely short period of time.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In Figures 2 to 4, 1 indicates a pipe 30 from the source.
A storage tank for raw water (muddy water, turbid water) drawn by

2.3 is a chemical liquid tank installed on the storage tank 1, and above each chemical liquid tank 2, 3 there are chemical liquid dissolving devices 4, 5 equipped with stirring blades 31, 32 and motors 33, 34 for driving the stirring blades 31, 32. The chemical solution dissolving devices 4, 5 and the chemical solution tank 2,
3 and are connected to each other by connecting pipes 37 and 38 via on-off valves 35 and 36.

6 is a reaction tank supported by a pedestal 42 above the storage tank;
A raw water main pipe 7 connected to the raw water pump 39 provided in the storage tank 1 is led to the upper side of the reaction tank 6, and inside the tank, one end is connected to the raw water main pipe 1 and a jet 08 at the tip is guided.
1 is the raw water pipe 8 that is inserted deeply to a position close to the bottom of the tank
A chemical feed pipe 10 is connected to an appropriate location of the raw water pipe 8 or the raw water main pipe 1 through one of the chemical liquid tanks 2 and a chemical liquid pump 9, and a reaction pipe near the spout 81 is connected. A drug supply pipe 12 guided through the other chemical liquid tank 3 and the chemical liquid pump 11 is inserted into the intermediate part of the tank.

In the reaction tank 6 and the raw water pipe 8, horizontal or moderately inclined annular plates 13 and 14 are arranged alternately in the height direction, thereby forming a bent part in the reaction tank. .

On the other hand, a drain pipe 15 is connected to the bottom of the reaction tank 6, the lower end of which communicates with the storage tank 1 and which has an on-off valve 16 in the middle.

The above-mentioned nozzle 81 may have a straight shape as in the embodiment shown in FIG. 6, and the raw water may be injected directly to the bottom of the tank. A structure may also be adopted in which a cone-shaped or bowl-shaped cylinder 40 is first provided oppositely, and the raw water is reflected onto this cylinder 40.

In either case, there is a slope 17 on the bottom of the reaction tank 6 that is higher on the outside with the opening of the drain pipe 15 as the center.
It is appropriate to provide

18 is a take-out pipe connected to the upper side of the reaction tank 6;
The sedimentation concentration tank 19 may be connected directly to the sedimentation concentration tank 19 as in the embodiment of FIGS. 2 and 3, or indirectly through the downstream reaction tank 20 as in the embodiment of FIG.
You may also contact.

In the latter case, the withdrawal pipe 18 is led to the upper inlet of a downstream reaction tank 20, the outlet pipe 21 of which is connected to the precipitation concentration tank 19.

As shown in FIG. 4, the downstream reaction tank 20 is constituted by a spiral gutter 22 that is continuous from the upper inlet to the lower outlet, so that a long reaction time can be obtained. ing.

Therefore, even if there is unreacted material in the reaction tank 6 at the front stage, or even if the material to be treated has physical properties that have a weak affinity with the chemical and are difficult to separate, the reaction will be completed while flowing through the gutter 22. It becomes possible to complete.

Further, as shown in FIGS. 2 and 3, the sedimentation concentration tank 19 includes a porous peripheral side wall 24 made by stretching a wire mesh 24 on a frame 25, and It has a non-porous bottom wall 26 stretched below, and the non-porous bottom wall 26 is provided at a suitable position in the middle part.
An overflow partition plate 27 is erected from above.

Then, on the outside of the non-porous bottom wall 26, there is a water collection gutter 2 of the required depth.
A submersible pump 2 is formed around the porous peripheral wall 24 to collect liquid leaked from the porous peripheral wall 24 into a water collection gutter 28, and is installed at an appropriate location of the water collection gutter 28.
9 to drain water.

Although the water collection gutter 28 is horizontal in the embodiment, it may be inclined toward the location where the submersible pump 29 is located.

Although the raw water storage tank 1 is used in this embodiment, it may be omitted and the raw water generation source and the reaction tank 6 may be directly connected through the raw water main pipe 7, or a type of chemical solution may be used to perform the flocculation. In this case, the drug supply pipe 12 in the middle of the reaction tank should be removed, or
Alternatively, the supply of the chemical solution may be stopped by closing the valve.

Further, the reaction tank 6 may be used as a horizontal type as shown in Fig. i7.

Next, to explain muddy water treatment using the device of the present invention using two types of chemicals as an example, waste muddy water from the muddy method or muddy water generated in tunnel construction, stone crushing plants, etc. It is taken out through the main pipe 7 and continuously supplied to the reaction tank 6.

On the other hand, several kinds of chemical solutions such as flocculants, for example, a chemical solution that separates water and solid particles in raw water (this is called "Liquid A"),
A chemical solution that binds solid particles and granulates into large particles (this is called liquid B) is produced by the chemical solution dissolving devices 2 and 3, respectively, and is continuously fed to the chemical solution tanks 2 and 3 through connecting pipes 37 and 38. be done.

Then, the liquid A is sent by the chemical liquid pump 9 through the chemical supply pipe 10 to the connecting portion with the raw water main pipe 7 or the raw water pipe 8, and is caused to flow into the raw water stream being pumped thereto, and is premixed.

Next, the premixed raw water and liquid A are pressure-sprayed toward the tank bottom from the tip nozzle 81 of the raw water pipe 8, which is deeply inserted to a position close to the bottom of the reaction tank. collided with.

After being reflected and dispersed, the light collides with the interference plate 13 extending inside the tank and is dispersed.

On the other hand, the B liquid is injected into the reaction tank 6 from a position close to the bottom of the reaction tank 6 through the chemical feed pipe 12 by the chemical liquid pump 11, and is mixed into a complicated overflow of raw water and A liquid.

Therefore, a vigorous mixing and stirring action is obtained, and the raw water and liquid A rapidly coagulate in various places, and the solid particles separated from the raw water also react with liquid B and are rapidly granulated. When the friction plate 13 passes between the raw water pipes 8 and floats to the surface, it sequentially collides with the friction plate 14 of each stage and repeats the bending action.

Therefore, the raw water, A liquid, and B liquid are sufficiently and uniformly mixed as if using a mixer, and reach the upper side of the reaction tank 6 in a state where they are completely separated into solid and liquid.

Then, the solid content (agglomerated content) is directly taken out from the extraction pipe 18 using the separated liquid content as a transport carrier and transferred to the precipitation concentration tank 1.
9 and is made to flow in.

In this sedimentation concentration tank 19, since the tank has a porous peripheral side wall 24, the liquid quickly leaks out and flows into the water collection gutter 28 on the outer periphery, and is taken out by the submersible pump 29 and discharged.

On the other hand, the solid content is collected by the porous peripheral side wall 24, deposited on the bottom, and gradually dehydrated, so it is only necessary to take it out and dispose of it as appropriate, and the liquid content due to dehydration is removed by the overflow partition plate 2
1 and flows into the collection gutter 2 through the porous peripheral wall 24.
It is collected at 8.

In addition, when the downstream reaction tank 20 is interposed between the reaction tank 6 and the precipitation concentration tank 19 as in the embodiment shown in FIG. is promoted, making it possible to separate solid and liquid more completely.

According to the present invention as described above, instead of letting the raw water flow down naturally and adding the chemical solution to cause a flocculation reaction, the raw water with the chemical solution added thereto is forcibly injected into the tank, and the tank wall and The raw water and chemical liquid are dispersed by the collision between them, and the oil is flowed while they flow to mix and stir, so the flocculation reaction is quick (and uniform), and the solids can be separated effectively in a very short time. This has the advantage that it can be discharged as clean water that does not contain unreacted chemical solutions.

Furthermore, since the present invention uses a method in which the raw water pipe is inserted deeply into the tank to cause a reaction, the equipment structure is extremely simple compared to the conventional method in which multiple flow plates are provided, making the equipment compact and inexpensive. It has the effect of being able to
Therefore, it is a highly effective and practical device for treating mud and turbid water generated in various civil engineering and construction works.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a solid-liquid reaction means in conventional muddy water treatment, FIG. 2 is a plan view showing an embodiment of the muddy water treatment device according to the present invention, and FIG. 3 is a partially cutaway side view thereof. 1
The figure is a partially cutaway side view showing another embodiment of the present invention, Figures 5 and 6 are sectional views showing an embodiment of the reaction tank in the present invention, and Figure 1 is an embodiment in which the reaction tank is used as a horizontal type. FIG. In the drawing, 2 and 3 are chemical tanks, 6 is a reaction tank, 8 is a raw water pipe, 10 and 12 are drug supply pipes, 13 and 14 are jamb plates, and 18
19 is a precipitate concentration tank, 20 is a downstream reaction tank, and 81 is a spout.

Claims (1)

[Claims] 1 In the raw water piping system, install a reaction tank with a stepped board inside, install a raw water pipe with the tip of the nozzle inserted deeply into the tank, and connect the raw water pipe from the chemical tank to the appropriate place. A muddy water treatment device, characterized in that, while the liquid supply pipe is connected to the reaction tank, a take-out pipe is provided at a point opposite to the spout of the reaction tank to communicate with the sedimentation concentration tank through or without the downstream reaction tank.