KR102145974B1 - Apparatus for neutralizing tunnel excavation waste water - Google Patents

Abstract

The present invention relates to an apparatus for neutralizing tunnel excavation wastewater. More specifically, according to the present invention, the apparatus comprises a first mixing means including a plurality of mixing blades and a second mixing means including a pressure increasing chamber. Accordingly, the tunnel excavation wastewater and carbon dioxide pass through the plurality of mixing blades, which are the first mixing means, to be primarily mixed while being rotated to periodically change a rotational direction into an opposite direction. When the tunnel excavation wastewater and the carbon dioxide enter the pressure increasing chamber, which is the second mixing means, pressure is rapidly increased while a flow rate is rapidly decreased, such that the tunnel excavation wastewater and the carbon dioxide are secondarily mixed. Accordingly, more carbon oxide is dissolved in the tunnel excavation wastewater, thereby uniformly and efficiently performing neutralization.

Description

Tunnel excavation wastewater neutralization system {APPARATUS FOR NEUTRALIZING TUNNEL EXCAVATION WASTE WATER}

The present invention relates to an apparatus for neutralizing tunnel excavation wastewater, and more particularly, a first mixing means consisting of a plurality of mixing blades and a second mixing means consisting of a pressure increasing chamber, so that the tunnel excavation wastewater and carbon dioxide gas are first As it passes through a number of mixing blades, which are mixing means, it is first mixed while rotating so that the rotational direction is changed to the opposite direction at a certain period, and then enters the pressure increase chamber, which is the second mixing means, and the flow rate decreases rapidly and the pressure increases rapidly. The present invention relates to an apparatus for neutralizing tunnel excavation wastewater capable of being mixed secondarily so that a greater amount of carbon dioxide gas is dissolved in tunnel excavation wastewater so that neutralization can be performed more uniformly and efficiently.

In the process of constructing roads, railroads, and subways, tunnels are often constructed, and the tunnel excavation method at this time is generally the NATM (New Austrian Tunneling Method) method.

This NATM method is a method to advance while removing the rock mass by drilling a hole in the rock mass using a drill, loading and blasting gunpowder, and the collapse of the rock by shortcrete processing the inner wall of the tunnel to a thickness of about 10 cm for the purpose of strengthening the inner wall of the tunnel after the tunnel blasting. It is a construction method that prevents.

Drills used to excavate tunnels use excavation water when drilling rock mass, and this excavation water is used as cooling water and discharged to the outside of the site in a state in which dust generated during drilling is mixed.

In addition, when shortcrete is placed, moisture contained in shortcrete also falls to the floor and is discharged to the outside.

In addition, when passing through an underground aquifer during excavation work, groundwater must also be discharged from the site.

At this time, the above-mentioned various kinds of water are mostly mixed together and discharged to the outside, which is referred to as excavation wastewater.

Excavation wastewater contains a large amount of suspended substances such as stone dust, and the acidity of the water is alkaline with a pH of about 10 or higher, so it must be properly treated and discharged into public waters.

Excavation wastewater is mostly groundwater and excavation water (about 80%), and shortcrete pouring wastewater constitutes a part.

The high content of suspended solids in the excavation wastewater is due to the mixing of stone dust generated during the drilling process of the jumbo drill and the soils in the workshop.

In addition, the pH of wastewater is strongly alkaline due to cement, various admixtures, etc. from shortcrete poured wastewater.

In addition, suspended solids are generated by the mixed stone dust and soil, and normal hexane (n-hexane), which is a pollutant such as oil, is generated by jumbo drills, backhoes, trucks, etc. used during excavation, and is used for rock blasting. Contaminants such as total nitrogen (TN) and total phosphorus (TP) are generated by explosives.

As such, excavation wastewater generated during tunnel construction has a large amount of suspended matter and strong alkalinity, and an appropriate treatment method must be applied to treat such pollutants.

That is, as a general process for treating excavation wastewater, alkaline wastewater is neutralized, and a large amount of suspended matter is removed by gravity precipitation using chemicals or the like.

1 is a view showing a general treatment process of tunnel excavation wastewater.

Each unit process is performed in each tank.In FIG. 1, the grit tank is a tank in which a process in which coarse particles among suspended matters are precipitated and separated by gravity, and the flow control tank maintains a constant quantity and quality of wastewater. It is a tank in which the process of transferring to the facility is carried out, and the neutralization reaction tank is a tank in which a process of mixing the wastewater and the neutralizing agent by introducing a neutralizing agent such as sulfuric acid to neutralize the acidity of the wastewater is performed. In order to treat fine suspended substances, a coagulant is added to the tank to grow the size of the suspended substances, and the sedimentation tank is a tank where the process of obtaining clean treated water by separating solid-liquid by gravitational precipitation of the suspended substances that have grown in size is performed. , The discharge tank is a tank in which the process of discharging clean treated water into public waters is performed.

As described above, in the related art, sulfuric acid was generally used to neutralize wastewater. However, if a strong acid such as sulfuric acid is used, equipment is corroded and there is a risk of handling.

In addition, in the related art, since a neutralization reaction tank for neutralizing wastewater must be separately installed, there is a problem in that a site for a wastewater treatment facility must be secured as much as an area corresponding thereto.

In addition, the conventional tunnel excavation wastewater neutralization apparatus has a problem in that the neutralization efficiency of the tunnel excavation wastewater is inferior because the mixing of carbon dioxide gas and the tunnel excavation wastewater by the mixing means is not performed efficiently.

On the other hand, as a conventional technology related to the neutralization treatment device for tunnel excavation wastewater, there is Korean Patent Publication No. 10-2012-0040411.

The present invention is to solve the above-described problem, and comprises a first mixing means consisting of a plurality of mixing blades and a second mixing means consisting of a pressure increasing chamber, so that the tunnel excavation wastewater and carbon dioxide gas are mixed with a plurality of the first mixing means. The tunnel is excavated as it is first mixed while rotating so that the direction of rotation is changed to the opposite direction at a certain period while passing through the wing, and then it enters the pressure increasing chamber, which is the second mixing means, and the flow rate decreases rapidly and the pressure increases rapidly. An object of the present invention is to provide an apparatus for neutralizing tunnel excavation wastewater that can be neutralized more uniformly and efficiently by dissolving a greater amount of carbon dioxide gas in wastewater.

The problem to be solved by the present invention is not limited to the above-described problem, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description.

In the tunnel excavation wastewater neutralization apparatus according to the present invention to achieve the above object, coarse particles, etc., among the suspended substances contained in the tunnel excavation wastewater are precipitated and separated in the grit tank by gravity, and then the quantity and quality are uniform in the flow control tank. An apparatus for neutralizing tunnel excavation wastewater for neutralizing maintained alkaline tunnel excavation wastewater, comprising: a liquefied carbon dioxide gas injection pipe to which a plurality of liquefied carbon dioxide tanks are detachably coupled; A gas regulator installed at one end of the liquefied carbon dioxide gas injection pipe to vaporize the liquefied carbon dioxide gas and adjust the pressure of the vaporized carbon dioxide gas; A carbon dioxide gas injection line in the form of a tube through which carbon dioxide gas whose pressure is adjusted by the gas regulator is transferred, and at least one opening and closing valve is installed; A wastewater injection line in the form of a pipe through which alkaline tunnel excavation wastewater in the flow rate control tank is transferred; A first mixing means in which carbon dioxide gas transferred through the carbon dioxide gas injection line and tunnel excavation waste water transferred through the waste water injection line are injected and mixed while passing through; A first transfer line in the form of a pipe through which the mixed wastewater first mixed by the first mixing means is transferred; A second mixing means for secondary mixing while the mixed wastewater transferred through the first transfer line is injected and passed; And a second transfer line in the form of a tube through which the mixed wastewater secondly mixed by the second mixing means is transferred to a subsequent process facility, wherein the first mixing means includes: a chamber in which a fixing bar is fixedly installed therein; And And a plurality of mixing blades fixedly formed to be spaced apart from each other at regular intervals on the fixing bar, and wherein the second mixing means comprises a pressure increasing chamber.

At this time, the mixing wing, a plurality of wing portions formed in a twisted shape; And a fluid flow passage formed between the plurality of wing portions to rotate the fluid passing therethrough.

In addition, the mixing blade is formed in a shape in which the blade portions of the adjacent mixing blades are twisted in opposite directions to each other, so that carbon dioxide gas and tunnel excavation wastewater pass through the fluid flow passages of each of the mixing blades and rotate at a certain period. It is characterized in that it is switched in the opposite direction.

In addition, a partition wall for reducing the rotational speed of tunnel excavation wastewater and carbon dioxide gas is formed at the upper end of the wing of the mixing blade, and the partition wall is inclined in a direction facing the rotation direction of the carbon dioxide gas and the tunnel excavation wastewater. It is characterized in that it is formed.

In addition, the pressure increasing chamber includes first to fourth spaces formed by dividing a space by three barrier walls, and a pH measuring sensor and a check valve are formed in the first to third spaces, In the second to fourth spaces, a discharge pipe connected to the second transfer line is formed, and a solenoid valve is formed in the discharge pipe.

The apparatus for neutralizing tunnel excavation wastewater according to the present invention includes a first mixing means composed of a plurality of mixing blades, and each blade portion constituting the mixing blade is formed in a shape twisted from the top to the bottom. A fluid flow passage having a twisted structure capable of rotating a fluid is formed therebetween, so that the tunnel excavation wastewater and carbon dioxide gas introduced into the first mixing means can be efficiently mixed while rotating through the fluid flow passage.

In addition, a plurality of mixing blades are provided so as to be spaced apart at regular intervals, but the blades of adjacent mixing blades are formed in a twisted shape in opposite directions, so that the fluid flow passages of adjacent mixing blades are formed in a structure that is twisted in opposite directions, resulting in tunnel excavation wastewater. Whenever the and carbon dioxide gas pass through the fluid flow passages of the respective mixing blades, the rotation direction is changed and rotated in the opposite direction, thereby improving the mixing efficiency of the tunnel excavation wastewater and carbon dioxide gas.

In addition, since a plurality of mixing blades are provided to be spaced apart from each other at regular intervals, the time during which the tunnel excavation wastewater and carbon dioxide gas can be mixed is increased, so that the carbon dioxide gas is sufficiently dissolved in the tunnel excavation wastewater.

In addition, by forming a partition wall to prevent the rotation of tunnel excavation wastewater and carbon dioxide gas at the top of each wing constituting the mixing blade, reducing the rotation speed increases the time for mixing the tunnel excavation wastewater and carbon dioxide gas. As the rotation speed is reduced by preventing the rotation of tunnel excavation wastewater and carbon dioxide gas, the pressure of the fluid mixed with the tunnel excavation wastewater and carbon dioxide gas is increased to dissolve a greater amount of carbon dioxide in the tunnel excavation wastewater, thereby increasing the neutralization efficiency. Can be improved.

In addition, since the partition wall is formed in a shape inclined by a predetermined angle in a direction facing the rotation direction of the tunnel excavation wastewater and carbon dioxide gas, the effect of reducing the rotational speed of the tunnel excavation wastewater and the carbon dioxide gas and increasing the pressure may be further increased.

In addition, a pressure increasing chamber is provided as the second mixing means, wherein the pressure increasing chamber is a flow path of 5 to 10 times the cross-sectional area of the flow path of the first mixing means chamber so as to sufficiently reduce the flow rate of the incoming tunnel excavation wastewater and carbon dioxide gas. It is formed to have a cross-sectional area, and the tunnel excavation wastewater and carbon dioxide gas introduced based on the usual flow rate when the neutralization treatment device is operated are formed in a length that can stay in the pressure increase chamber for 5 to 10 seconds. Accordingly, as tunnel excavation wastewater and carbon dioxide gas flow into the pressure increase chamber, the flow velocity decreases rapidly due to the increased cross-sectional area, and the pressure increases rapidly, and the carbon dioxide gas and tunnel excavation wastewater remain in the pressure increase chamber for a certain period of time and are mixed. As a result, more carbon dioxide gas can be dissolved in the tunnel excavation wastewater.

In addition, since it is not necessary to separately install a neutralization reaction tank to neutralize wastewater, there is an effect of minimizing the area of the site for installing the wastewater treatment facility.

In addition, according to the present invention, by using liquefied carbon dioxide gas without using a strong acid as a neutralizing agent, it is possible to prevent the equipment from being corroded, handle it safely, and more efficiently neutralize alkaline wastewater.

In addition, the present invention has the effect of performing a more uniform and efficient neutralization by first mixing the tunnel excavation wastewater and carbon dioxide gas in the first mixing means and then secondary mixing in the second mixing means.

In addition, the present invention has the effect of installing a cooling means in the wastewater injection line so that the alkaline tunnel excavation wastewater in the flow control tank is cooled before being injected into the first mixing means, so that the tunnel excavation wastewater and carbon dioxide gas are smoothly mixed. have.

The effects of the present invention are not limited to the effects mentioned above, and other effects that are not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a view showing a general treatment process of tunnel excavation wastewater.
2 is a view showing an apparatus for neutralizing tunnel excavation wastewater according to a preferred embodiment of the present invention.
3 is a view showing a first modified example of FIG. 2.
4 is a view showing a second modified example of FIG. 2.
5 is a view showing an apparatus for neutralizing tunnel excavation wastewater according to another exemplary embodiment of the present invention.
6 is a view showing the shape of the mixing blade included in the neutralization treatment apparatus for tunnel excavation wastewater according to another preferred embodiment of the present invention.
7 is a schematic diagram for explaining the effect of the partition wall formed on the mixing blade included in the neutralization apparatus for tunnel excavation wastewater according to another preferred embodiment of the present invention.
8 is a schematic diagram showing the shapes of the first mixing means and the second mixing means included in the tunnel excavation wastewater neutralization apparatus according to another preferred embodiment of the present invention.
9 is a view showing the shape of a pressure increase chamber included in the neutralization treatment apparatus for tunnel excavation wastewater according to another preferred embodiment of the present invention.

Preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, but technical parts that are already well-known will be omitted or compressed for conciseness of description.

Hereinafter, an apparatus for neutralizing tunnel excavation wastewater according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a view showing an apparatus for neutralizing tunnel excavation wastewater according to a preferred embodiment of the present invention, FIG. 3 is a view showing a first modified example of FIG. 2, and FIG. 4 is a second modified example of FIG. It is a drawing.

As shown in Figs. 2 to 4, in the tunnel excavation wastewater neutralization apparatus according to a preferred embodiment of the present invention, coarse particles, etc., of suspended substances contained in the tunnel excavation wastewater are collected in the grit tank 1 by gravity. After sedimentation is separated, it is to neutralize the alkaline tunnel excavation wastewater in which the quantity and quality are kept constant in the flow control tank 2, the liquefied carbon dioxide injection pipe 10, the gas regulator 20, and the carbon dioxide gas injection line 30 ), a wastewater injection line 40, a first mixing means 50, a first transfer line 60, a second mixing means 70 and a second transfer line 80.

The equipment for neutralization of wastewater from tunnel excavation constructed as described above may be named "ECO CARBON DIOXIDE GAS NEUTRALIZING SYSTEM (ECO-CNS)" because it neutralizes wastewater environmentally using carbon dioxide gas.

The liquefied carbon dioxide injection pipe 10 has a predetermined length, and a portable small liquefied carbon dioxide tank T of about 40 kg, which is provided in plural along the longitudinal direction, is detachably coupled.

It is preferable that the liquefied carbon dioxide injection pipe 10 is provided in plural and disposed in parallel.

In addition, a pressure gauge P is installed in each of the plurality of liquefied carbon dioxide gas injection pipes 10, and at this time, a carbon dioxide gas injection line 30 to be described later is provided in the plurality of liquefied carbon dioxide gas injection pipes 10 arranged in parallel. Connected.

The gas regulator 20 is installed at one end of the liquefied carbon dioxide gas injection pipe 10 to vaporize the liquefied carbon dioxide gas and adjust the pressure of the vaporized carbon dioxide gas.

The carbon dioxide gas injection line 30 is formed in a tube shape in which one or more on-off valves V1 are installed, and the carbon dioxide gas whose pressure is adjusted by the gas regulator 20 is transferred to the first mixing means 50 to be described later. to be.

Meanwhile, a carbon dioxide gas injection line 30 is connected to a plurality of liquefied carbon dioxide gas injection pipes 10 arranged in parallel, and an opening/closing valve V1 is installed in the plurality of carbon dioxide gas injection lines 30, respectively.

It is preferable that the on-off valve V1 is made of a solenoid valve.

At this time, any one of the plurality of carbon dioxide gas injection lines 30 is connected to the first mixing means 50 to be described later, and the main carbon dioxide gas among the plurality of carbon dioxide gas injection lines 30 The carbon dioxide injection lines 32 other than the injection line 31 are branched from the main carbon dioxide injection line 31.

In addition, the main carbon dioxide gas injection line 31 branched from the main carbon dioxide gas injection line 31 but located between the carbon dioxide gas injection line 30 and the first mixing unit 50 closest to the first mixing unit 50 The injection valve V2 is installed.

This injection valve (V2) is preferably made of a solenoid valve.

In addition, a pressure gauge P and an ejector (not shown) may be installed in the main carbon dioxide injection line 31 located between the injection valve V2 and the first mixing means 50.

Since the high-pressure wastewater passes through the line static mixer, which is the first mixing means 50, the ejector is required to set carbon dioxide gas to high pressure and suck it into the high-pressure wastewater.

The wastewater injection line 40 is formed in a tubular shape and is a line through which alkaline tunnel excavation wastewater in the flow rate control tank 2 is transferred to the first mixing means 50.

The wastewater injection line 40 is provided with a cooling means 42 for cooling the wastewater, and the cooling means 42 may be formed in the form of a cooling line surrounding the outer circumferential surface of the wastewater injection line 40, or other methods. It can also be implemented as

As described above, by installing the cooling means 42 in the wastewater injection line 40 so that the alkaline tunnel excavation wastewater in the flow rate adjustment tank 2 is cooled before being injected into the first mixing means 50, the mixing of the tunnel excavation wastewater and carbon dioxide gas is It can be done smoothly.

The first mixing means 50 is the carbon dioxide gas transferred through the carbon dioxide gas injection line 30 and the tunnel excavation waste water transferred through the waste water injection line 40 is injected and first mixed while passing through, a line static mixer (line static mixer) is preferred.

The first transfer line 60 is formed in a tubular shape and transfers the mixed wastewater first mixed in the first mixing means 50 to the second mixing means 70 to be described later.

The second mixing means 70 is that the mixed wastewater transferred through the first transfer line 60 is injected and is secondarily mixed while passing, and is formed in a cyclone form 72 as shown in FIG. , As shown in FIG. 3, a spring is installed in a shape 74 in the longitudinal direction inside the hollow tube, or a plurality of propellers are installed in a hollow tube in the longitudinal direction as shown in FIG. It can be made of (76).

In this way, the tunnel excavation wastewater and carbon dioxide gas are first mixed in the first mixing means 50 and then secondary mixed in the second mixing means 70, so that neutralization can be achieved more uniformly and efficiently. do.

In another configuration, the first mixing means may be made in the form of a cyclone, or may be made in the form of installing a spring or a propeller along the longitudinal direction inside the hollow tube, and the second mixing means may be made of a line static mixer. .

The second transfer line 80 is formed in a tube shape and is a line through which the mixed wastewater secondaryly mixed in the second mixing means 70 is transferred to the subsequent process facility F.

Meanwhile, although not shown in the drawings, a control unit (not shown) for controlling the overall configuration of the neutralization treatment apparatus is provided separately.

In the neutralization treatment method using the neutralization treatment device of tunnel excavation wastewater according to the present invention having the above configuration, coarse particles, etc., among suspended substances contained in the tunnel excavation wastewater are precipitated and separated in the sedimentation tank 1 by gravity, It is to neutralize the alkaline tunnel excavation wastewater that is kept constant in quantity and quality in the flow control tank (2).

The method for neutralizing tunnel excavation wastewater according to the present invention is liquefied in a gas regulator 20 installed at one end of a liquefied carbon dioxide gas injection pipe 10 to which a plurality of liquefied carbon dioxide tanks T are detachably coupled. A first step of vaporizing carbon dioxide gas and adjusting the pressure of the vaporized carbon dioxide gas; A second step of transferring the carbon dioxide gas whose pressure is adjusted by the gas regulator 20 through the carbon dioxide gas injection line 30 formed in the form of a tube in which one or more opening and closing valves V1 are installed; A third step of transferring the alkaline tunnel excavation wastewater in the flow control tank 2 through the wastewater injection line 40 formed in a tube shape; A fourth step of injecting the carbon dioxide gas transferred through the carbon dioxide gas injection line 30 and the tunnel excavation waste water transferred through the waste water injection line 40 into the first mixing means 50 and mixing them first; A fifth step of transferring the mixed wastewater firstly mixed in the first mixing means 50 through the first transfer line 60 formed in a tubular shape; A sixth step of injecting the mixed wastewater transferred through the first transfer line 60 into the second mixing means 70 and secondarily mixing the mixed wastewater; And a seventh step of transferring the mixed wastewater secondaryly mixed in the second mixing means 70 to the subsequent process facility (F) through the second transfer line 80 formed in a tubular shape.

At this time, the liquefied carbon dioxide gas injection pipe 10 is provided in plural and arranged in parallel, and the carbon dioxide gas injection line 30 is connected to the plurality of liquefied carbon dioxide gas injection pipes 10 arranged in parallel as described above, but a plurality of carbon dioxide gas On/off valves V1 are respectively installed in the injection line 30.

In addition, one of the plurality of carbon dioxide gas injection lines 30, one of the main carbon dioxide gas injection line 31 is connected to the first mixing means 50, the main carbon dioxide gas injection line among the plurality of carbon dioxide gas injection lines 30 The carbon dioxide injection lines 32 other than the 31 are branched from the main carbon dioxide injection line 31.

In addition, a pressure gauge (P) is installed in each of the plurality of liquefied carbon dioxide injection pipes 10, and a carbon dioxide gas injection line 32 which is branched from the main carbon dioxide injection line 31 but closest to the first mixing means 50 The injection valve V2 is installed in the main carbon dioxide gas injection line 31 located between the and the first mixing means 50.

At this time, when the pressure of any one of the plurality of liquefied carbon dioxide gas injection pipes 10 decreases, the on/off valve V1 installed in the liquefied carbon dioxide injection pipe 10 is closed and any other It is made to open the on-off valve (V1) installed in one of the liquefied carbon dioxide injection pipe (10).

In addition, the opening and closing of the injection valve V2 for injecting carbon dioxide gas into the first mixing means 50 is automatically controlled according to the pH value of the mixed wastewater measured by the pH sensor S installed in the subsequent process facility F. Is made to do.

In addition, a cooling means 42 is installed in the wastewater injection line 40 to cool the alkaline tunnel excavation wastewater in the flow rate control tank 2 before being injected into the first mixing means 50.

As described above, by installing the cooling means 42 in the wastewater injection line 40 so that the alkaline tunnel excavation wastewater in the flow rate control tank 2 is cooled before being injected into the first mixing means 50, the tunnel excavation wastewater and carbon dioxide gas are Mixing can be made smoothly.

In addition, the first mixing means 50 is made of a line static mixer, and the second mixing means 70 is made of a cyclone type 72, or in a lengthwise direction inside a hollow tube. It may be formed in a form in which a spring is installed along the line 74 or a form in which a propeller is installed in a lengthwise direction inside a hollow tube (76).

In this way, by first mixing the tunnel excavation wastewater and carbon dioxide gas in the first mixing means 50 and then performing the secondary mixing in the second mixing means 70, it is possible to achieve more uniform and efficient neutralization. .

Meanwhile, FIG. 5 is a view showing an apparatus for neutralizing tunnel excavation wastewater according to another exemplary embodiment of the present invention, and FIG. 6 is a mixing blade included in the neutralization apparatus for tunnel excavation wastewater according to another exemplary embodiment of the present invention. 7 is a schematic view for explaining the effect of the partition wall formed on the mixing blade included in the tunnel excavation wastewater neutralization apparatus according to another preferred embodiment of the present invention, and FIG. 8 is the present invention It is a schematic diagram showing the shape of the first mixing means and the second mixing means included in the tunnel excavation wastewater neutralization treatment apparatus according to another preferred embodiment of the.

Hereinafter, an apparatus for neutralizing tunnel excavation wastewater according to another exemplary embodiment of the present invention will be described in detail with reference to FIGS. 5 to 8, but a description of a configuration overlapping with that described above will be omitted.

5 to 8, the tunnel excavation wastewater neutralization treatment apparatus according to another preferred embodiment of the present invention includes a chamber 56 and a plurality of mixing blades 51 installed inside the chamber 56. It comprises a configured first mixing means 50 and a second mixing means 70 formed in the form of a pressure increasing chamber 71.

Mixing blades 51 of the first mixing means 50, as shown in Figs. 6 and 8, a plurality of mixing blades 51 on the fixing bar 57 formed with the fixing part 55 at the top and bottom It is fixedly formed so as to be spaced apart from each other at regular intervals, and the fixing bar 57 on which the plurality of mixing blades 51 is fixed is installed to be fixed inside the chamber 56 through the fixing portions 55 formed at the upper and lower ends. Since there are various known means for fixing the fixing part 55 to the chamber 56, a detailed description will be omitted.

The mixing blades 51 are each composed of a plurality of wing portions 52, and the plurality of wing portions 52 are each formed in a twisted shape from the top to the bottom, so that the fluid between each wing portion 52 is A fluid flow passage 53 of a twistable structure that can be rotated is formed, and each of the blades 52 of the adjacent mixing blades 51 are formed in a twisted shape in the opposite direction to the fluid flow of the adjacent mixing blades 51 The passages 53 are formed in a structure that is twisted in opposite directions.

Accordingly, after the carbon dioxide gas transferred through the carbon dioxide gas injection line 30 and the tunnel excavation waste water transferred through the waste water injection line 40 are injected into the chamber 56 of the first mixing means 50, each mixing is performed. It rotates while passing through the fluid flow path 53 of the blade 51, but the rotation direction is changed to the opposite direction according to the twisting direction of the fluid flow path 53 of each mixing blade 51 and rotates.

Specifically, after the carbon dioxide gas transferred through the carbon dioxide gas injection line 30 and the tunnel excavation waste water transferred through the waste water injection line 40 are injected into the chamber 56 of the first mixing means 50, As it passes through the fluid flow passage 53 of the upper first mixing blade 51, mixing is performed while rotating clockwise according to the twisted direction of the fluid flow passage 53, and the installation gap between the mixing blades 51 By this, mixing is performed while continuing to rotate clockwise until it enters the fluid flow passage 53 of the upper second mix wing 51 of FIG. 6 located at the right bottom.

Thereafter, when the tunnel excavation wastewater and carbon dioxide gas enter the fluid flow passage 53 of the second mixing blade 51 at the top of FIG. 6, the direction opposite to the rotation direction according to the twisted direction of the fluid flow passage 53, that is, The rotation direction is changed in the counterclockwise direction to rotate, and then the rotation direction is changed to the opposite direction each time it passes through the fluid flow passage 53 of the mixing blades 51 at the bottom in turn, and mixing is performed. Therefore, the tunnel excavation wastewater and carbon dioxide gas are mixed while being rotated so that the rotation direction is changed to the opposite direction at a certain period while passing through the plurality of mixing blades 51, so that a greater amount of carbon dioxide gas is dissolved in the tunnel excavation wastewater. I can.

In addition, since the plurality of mixing blades 51 are formed to be spaced apart from each other at regular intervals, the time during which the tunnel excavation wastewater and carbon dioxide gas can be mixed is increased, so that the carbon dioxide gas can be sufficiently dissolved in the tunnel excavation wastewater.

At this time, the outer diameter of the mixing blade 51 is formed close to the inner diameter of the chamber 56 so that the outer surface of the mixing blade 51 abuts against the inner surface of the chamber 56 ( 56) Carbon dioxide gas and tunnel excavation wastewater entering the interior cannot move between the outer surface of the mixing blade 51 and the inner surface of the chamber 56, but only through the fluid flow passage 53 of the mixing blade 51. Will move.

Meanwhile, a partition wall 54 is formed on the upper end of each wing 52 of the mixing blade 51 formed in the above shape, and the partition wall 54 prevents the rotation of the tunnel excavation wastewater and carbon dioxide gas. It is formed in a suitable position.

Specifically, as shown in FIGS. 6 and 7, a partition wall 54 is provided at the upper end of each wing 52 of the mixing blade 51 installed at a position in which tunnel excavation wastewater and carbon dioxide gas rotate clockwise. The upper end of each wing 52 of the mixing wing 51 is formed at the left end of the drawing on the upper end of the wing part 52, and installed at a position in which tunnel excavation wastewater and carbon dioxide gas rotate in a counterclockwise direction, a partition wall ( 54) is formed at the right end of the drawing above each wing 52, and accordingly, each bulkhead 54 effectively prevents the rotation of tunnel excavation wastewater and carbon dioxide gas and reduces the rotational speed, thereby reducing the tunnel excavation wastewater and By increasing the pressure of the fluid mixed with carbon dioxide gas, a greater amount of carbon dioxide gas is dissolved in the tunnel excavation wastewater, thereby improving the neutralization efficiency of the tunnel excavation wastewater.

In addition, each of the barrier ribs 54 is inclined by a certain angle in the direction facing the rotation direction of the carbon dioxide gas and the tunnel excavation wastewater to further increase the effect of reducing the rotational speed of the tunnel excavation wastewater and carbon dioxide gas and increasing the pressure. Is formed by

Meanwhile, in the drawing, it is shown that four wing portions 52 constituting the mixing wing 51 are formed, but are not limited thereto, and the number of wing portions 52 may be variously changed as necessary.

As shown in FIG. 4, the pressure increasing chamber 71 is a first mixing means (the first mixing means 50) so as to sufficiently reduce the flow rate of the tunnel excavation wastewater and carbon dioxide gas introduced after the first mixing through the first mixing means 50 50) It is formed to have a channel area of 5 to 10 times the channel area of the chamber 56, and when the neutralization treatment device is operated, the tunnel excavation wastewater and carbon dioxide gas introduced based on the normal flow rate are stored in the pressure increase chamber 71. It is formed in a length that can stay 5 to 10 seconds. Accordingly, as the tunnel excavation wastewater and carbon dioxide gas flow into the pressure increase chamber 71, the flow rate decreases rapidly due to the increased cross-sectional area, and the pressure is rapidly increased while staying in the pressure increase chamber 71 for a certain period of time and mixing. As a result, a greater amount of carbon dioxide gas is dissolved in the tunnel excavation wastewater, and the neutralization efficiency of the tunnel excavation wastewater can be significantly improved. Although not shown in the drawings, a separate control unit (not shown) for controlling the overall configuration of the neutralization treatment apparatus including the first mixing unit 50 and the second mixing unit 70 is provided.

Meanwhile, FIG. 9 is a view showing the shape of a pressure increasing chamber included in the apparatus for neutralizing tunnel excavation wastewater according to another preferred embodiment of the present invention.

Hereinafter, an apparatus for neutralizing tunnel excavation wastewater according to another exemplary embodiment of the present invention will be described in detail with reference to FIG. 9, but a description of a configuration overlapping with that described above will be omitted.

As shown in FIG. 9, the pressure increase chamber 71 of the tunnel excavation wastewater neutralization apparatus according to another preferred embodiment of the present invention has an internal space of 4 by three barrier walls 72d, 73d, and 74d. It is divided into dogs (72, 73, 74, 75), and the four internal spaces are sequentially divided into a first space 72, a second space 73, a third space 74, and a fourth space 75. Refers to.

Among the four inner spaces 72, 73, 74, and 75, the first to third spaces 72, 73 and 74 are respectively provided with pH measuring sensors 72a, 73a, and 74a.

The blocking walls 72d, 73d, 74d are sequentially divided into a first blocking wall 72d, a second blocking wall 73d, and a third blocking wall 74d, and the blocking walls 72d, 73d, 74d A first check valve 72b, a second check valve 73b, and a third check valve 74b are formed in this order.

The first check valve 72b is a valve that opens only when the pressure in the first space 72 is greater than or equal to the set pressure P1, and the second check valve 73b is the pressure in the second space 73 is greater than or equal to the set pressure P2. The valve is opened only when the third check valve 72b is a valve that is opened only when the pressure in the third space 74 is equal to or higher than the set pressure P3. At this time, the size of the set pressure is P1 <P2 <P3, that is, P1 is the smallest and P3 is the largest. The structure in which the check valve opens above the set pressure has various known techniques including adjusting the strength of the spring, and thus a detailed description thereof will be omitted.

The discharge pipes 73e, 74e, and 75e connected only to the respective spaces are connected to the second space 73, the third space 74, and the fourth space 75 of the pressure increasing chamber 71, and these discharge pipes 73e, 74e and 75e have a branch tube shape and are commonly connected to the second transfer line 80. Each of the discharge pipes 73e, 74e, and 75e is provided with solenoid valves 73c, 74c, and 75c for opening and closing the discharge pipes 73e, 74e, and 75e. The discharge pipes 73e, 74e, and 75e are sequentially referred to as a first discharge pipe 73e, a second discharge pipe 74e, and a third discharge pipe 75e, and solenoid valves installed in each discharge pipe 73e, 74e, 75e ( 73c, 74c, and 75c are referred to as a first valve 73c, a second valve 74c, and a third valve 75c in order.

Meanwhile, although not shown in the drawing, a control unit (not shown) for controlling the overall configuration of the neutralization treatment apparatus including the pressure increasing chamber 71 is provided separately.

Hereinafter, the operation of the pressure increasing chamber 71 included in the apparatus for neutralizing tunnel excavation wastewater according to another exemplary embodiment of the present invention configured as described above will be described in detail.

First, tunnel excavation wastewater (mixed with carbon dioxide gas) introduced through the first mixing means 50 flows into the first space 72 of the pressure increasing chamber 71, and the pressure of the first space 72 Until P1 is reached, the pressure cannot be increased to the second space 73. At this time, the pH measurement sensor 72a installed in the first space 72 measures the pH of the tunnel excavation wastewater (mixed carbon dioxide gas) located in the first space 72. When the measured pH satisfies the pH condition in which discharge is allowed, the control unit (not shown) controls the first valve 73c of the first discharge pipe 73e connected to the second space 73 to be opened.

As a result, the wastewater is introduced into the second space 73 and then discharged to the second transfer line 80 through the first discharge pipe 73e.

If the pH value of the tunnel excavation wastewater (mixed carbon gas) measured in the first space 72 does not meet the discharge allowable condition, the first discharge pipe 73e of the second space 73 1 valve 73c is in a closed state, and accordingly, tunnel excavation wastewater flowing into the second space 73 through the first check valve 72b of the first space 72 (a mixture of carbon dioxide gas) The pressure increases in the second space 73 until the pressure becomes P2.

Thereafter, when the pH value of the tunnel excavation wastewater (mixed carbon gas) measured by the pH measuring sensor 73a of the second space 73 meets the discharge allowable condition, the control unit (not shown) Control is performed so that the second valve 74c of the second discharge pipe 74e of 74 is opened. Therefore, after the tunnel excavation wastewater (mixed carbon gas) flows from the second space 73 to the third space 74 through the second check valve 73b, the second discharge pipe of the third space 74 ( The tunnel excavation wastewater (mixed with carbon dioxide gas) is discharged to the second transfer line 80 through 74e).

If the pH value of the tunnel excavation wastewater (mixed carbon gas) measured in the second space (73) does not meet the discharge allowable conditions, the first discharge pipe (73e) of the second space (73) The first valve 73c is also closed, and the second valve 74c of the second discharge pipe 74e of the third space 74 is also in a closed state, and accordingly, the second check valve 73b of the second space 73 The pressure of the tunnel excavation wastewater (mixed with carbon dioxide gas) flowing into the third space 74 through the passage increases in pressure in the third space 74 until the pressure reaches P3.

Thereafter, when the pH value of the tunnel excavation wastewater (mixed carbon gas) measured by the pH measuring sensor 74a of the third space 74 satisfies the discharge allowable condition, the controller (not shown) The third valve 75c of the third discharge pipe 75e of 75 is controlled to be opened. Therefore, after the tunnel excavation wastewater (a mixture of carbon dioxide gas) flows into the fourth space 75 through the third check valve 74b between the third holes 74, the third discharge pipe of the fourth space 75 Tunnel excavation wastewater (a mixture of carbon dioxide gas) is discharged to the second transfer line 80 through 75e.

If the pH value of the wastewater measured in the third space 74 is less than the allowable discharge condition, the control unit (not shown) is the third valve 75c of the third discharge pipe 75e of the fourth space 75. ) To maintain the locked state to increase the pressure of the tunnel excavation wastewater (mixed carbon gas) flowing into the fourth space 75 and control the wastewater injection line 40 to inflow tunnel excavation wastewater. Control to reduce the flow rate to a small amount.

Thereafter, the pH measurement sensor 72a, 73a, 74a while increasing the pressure of the tunnel excavation wastewater (mixed carbon dioxide gas) of the fourth space 75 to the set pressure P4 in the range of 1.2 to 1.5 times P3. After checking the measured value of, when the pressure measured by the pressure sensor 75a of the fourth space 75 reaches the set pressure P4, the third valve 75c of the third discharge pipe 75e is opened and the tunnel excavation wastewater Discharge (mixed carbon dioxide gas). After opening the third valve 75c, the control unit (not shown) controls the wastewater injection line 40 to return the inflow flow rate of the tunnel excavation wastewater (mixed carbon dioxide gas) to normal again.

At this time, the pressure of the tunnel excavation wastewater (mixed carbon gas) measured by the pressure sensor 75a of the fourth space 75 reaches the set pressure P4, and the tunnel excavation wastewater (mixed carbon dioxide gas) When the measured pH value of the tunnel excavation wastewater (mixed carbon dioxide gas) is still below the discharge allowable condition, the control unit (not shown) provides the liquefied carbon dioxide gas injection pipe 10 and the gas regulator 20. ) And the carbon dioxide gas injection line 30 to inject an increased amount of carbon dioxide gas than before. That is, control is performed to increase the amount of carbon dioxide gas injected.

As described above, the pressure increasing chamber 71 further increases the dissolution rate of carbon dioxide gas by increasing the pressure of the tunnel excavation wastewater (mixed carbon dioxide gas) introduced through the first mixing means 50 to neutralize the reaction. It has a technical effect of increasing this, and in particular, it is possible to increase the pressure only when necessary by dividing the discharge pressure of the tunnel excavation wastewater (mixed carbon gas) into a plurality of sequential pressure values, thereby reducing the load of the driving device unnecessary. It is possible to control the load optimized without increasing it. In other words, if the pH value of the tunnel excavation wastewater (mixed carbon gas) at the pressure P1 satisfies the discharge allowable condition, it is no longer necessary to increase the pressure of the tunnel excavation wastewater (mixed carbon dioxide gas). As the load of (not shown) decreases, the probability of failure decreases and the lifespan increases.

The apparatus for neutralizing tunnel excavation wastewater according to the present invention as described above includes a first mixing means composed of a plurality of mixing blades, and each blade constituting the mixing blades is formed in a twisted shape from the top to the bottom. A fluid flow passage having a twisted structure capable of rotating a fluid is formed between the blades of the tunnel, so that the tunnel excavation wastewater and carbon dioxide gas introduced into the first mixing means can be efficiently mixed while rotating through the fluid flow passage.

In addition, a plurality of mixing blades are provided so as to be spaced apart at regular intervals, but the blades of adjacent mixing blades are formed in a twisted shape in opposite directions, so that the fluid flow passages of adjacent mixing blades are formed in a structure that is twisted in opposite directions, resulting in tunnel excavation wastewater. Whenever the and carbon dioxide gas pass through the fluid flow passages of the respective mixing blades, the rotation direction is changed and rotated in the opposite direction, thereby improving the mixing efficiency of the tunnel excavation wastewater and carbon dioxide gas.

In addition, since a plurality of mixing blades are provided to be spaced apart from each other at regular intervals, the time during which the tunnel excavation wastewater and carbon dioxide gas can be mixed is increased, so that the carbon dioxide gas is sufficiently dissolved in the tunnel excavation wastewater.

In addition, by forming a partition wall to prevent the rotation of tunnel excavation wastewater and carbon dioxide gas at the top of each wing constituting the mixing blade, reducing the rotation speed increases the time for mixing the tunnel excavation wastewater and carbon dioxide gas. As the rotation speed is reduced by preventing the rotation of tunnel excavation wastewater and carbon dioxide gas, the pressure of the fluid mixed with the tunnel excavation wastewater and carbon dioxide gas is increased to dissolve a greater amount of carbon dioxide in the tunnel excavation wastewater, thereby increasing the neutralization efficiency. Can be improved.

In addition, since the partition wall is formed in a shape inclined by a predetermined angle in a direction facing the rotation direction of the tunnel excavation wastewater and carbon dioxide gas, the effect of reducing the rotational speed of the tunnel excavation wastewater and the carbon dioxide gas and increasing the pressure may be further increased.

In addition, a pressure increasing chamber is provided as the second mixing means, wherein the pressure increasing chamber is a flow path that is 5 to 10 times the cross-sectional area of the flow path of the first mixing means chamber so as to sufficiently reduce the flow rate of the incoming tunnel excavation wastewater and carbon dioxide gas. It is formed to have a cross-sectional area, and the tunnel excavation wastewater and carbon dioxide gas introduced based on the normal flow rate when the neutralization treatment device is operated are formed in a length that can stay in the pressure increase chamber for 5 to 10 seconds. Accordingly, as tunnel excavation wastewater and carbon dioxide gas flow into the pressure increase chamber, the flow rate decreases rapidly due to the increased cross-sectional area, and the pressure increases rapidly. As a result, more carbon dioxide gas can be dissolved in the tunnel excavation wastewater.

In addition, since it is not necessary to separately install a neutralization reaction tank to neutralize wastewater, there is an effect of minimizing the area of the site for installing the wastewater treatment facility.

In addition, according to the present invention, by using liquefied carbon dioxide gas without using a strong acid as a neutralizing agent, it is possible to prevent the equipment from being corroded, handle it safely, and more efficiently neutralize alkaline wastewater.

In addition, the present invention has the effect of performing a more uniform and efficient neutralization by first mixing the tunnel excavation wastewater and carbon dioxide gas in the first mixing means and then secondary mixing in the second mixing means.

In addition, the present invention provides a cooling means in the wastewater injection line so that the alkaline tunnel excavation wastewater in the flow control tank is cooled before being injected into the first mixing means, so that the tunnel excavation wastewater and carbon dioxide gas are smoothly mixed. have.

As described above, a detailed description of the present invention has been made by an embodiment with reference to the accompanying drawings, but since the above-described embodiment has been described with reference to a preferred example of the present invention, the present invention is limited to the above embodiment. It should not be understood as being, and the scope of the present invention should be understood as the following claims and equivalent concepts.

10: liquefied carbon dioxide injection pipe
20: gas regulator
30: carbon dioxide gas injection line
40: wastewater injection line
50: first mixing means
60: first transfer line
70: second mixing means
80: second transfer line
T: Liquefied carbon dioxide tank
P: pressure gauge
F: Subsequent process equipment
S: pH sensor
V1: On-off valve
V2: Injection valve
<Another Example>
50: first mixing means
51: mixing wing
52: wing
53: fluid flow passage
54: Fight
55; Fixed part
56: chamber
57: fixed bar
70: second mixing means
71: pressure increase chamber
<Another Example>
71: pressure increase chamber
72: first space
72a: pH measurement sensor
72b: first check valve
72d: first blocking wall
73: second space
73a: pH measuring sensor
73b: second check valve
73c: first valve
73d: second blocking wall
73e: first discharge pipe
74: third space
74a: pH measuring sensor
74b: 3rd check valve
74c: 2nd valve
74d: 3rd blocking wall
74e: second discharge pipe
75: fourth space
75a: pressure sensor
75c: 3rd valve
75e: 3rd discharge pipe

Claims (5)

A device for neutralization of tunnel excavation wastewater to neutralize alkaline tunnel excavation wastewater that has a constant quantity and quality in the flow control tank after coarse particles among the suspended solids contained in the tunnel excavation wastewater are precipitated and separated by gravity in the sedimentation tank. as,
A liquefied carbon dioxide injection pipe to which a plurality of liquefied carbon dioxide tanks are detachably coupled;
A gas regulator installed at one end of the liquefied carbon dioxide gas injection pipe to vaporize the liquefied carbon dioxide gas and adjust the pressure of the vaporized carbon dioxide gas;
A carbon dioxide gas injection line in the form of a tube through which carbon dioxide gas whose pressure is adjusted by the gas regulator is transferred, and at least one opening and closing valve is installed;
A wastewater injection line in the form of a pipe through which alkaline tunnel excavation wastewater in the flow rate control tank is transferred;
A first mixing means in which carbon dioxide gas transferred through the carbon dioxide gas injection line and tunnel excavation waste water transferred through the waste water injection line are injected and mixed while passing through;
A first transfer line in the form of a pipe through which the mixed wastewater first mixed by the first mixing means is transferred;
A second mixing means for secondary mixing while the mixed wastewater transferred through the first transfer line is injected and passed; And
And a second transfer line in the form of a tube through which the mixed wastewater secondly mixed in the second mixing means is transferred to a subsequent process facility, and
The first mixing means,
A chamber in which a fixing bar is fixedly installed therein; And
It includes a plurality of mixing blades fixedly formed to be spaced apart from each other at regular intervals on the fixed bar,
The mixing blade,
A plurality of wing portions formed in a twisted shape; And
Includes; a fluid flow passage formed between the plurality of wing portions to rotate the fluid passing through,
A partition wall for reducing the rotational speed of tunnel excavation wastewater and carbon dioxide gas is formed at the upper end of the wing of the mixing blade,
The partition wall is an apparatus for neutralizing tunnel excavation wastewater, wherein the partition wall is formed in a shape inclined in a direction facing the rotation direction of carbon dioxide gas and the tunnel excavation wastewater.
delete The method of claim 1,
The mixing blade,
Each of the blades of the adjacent mixing blades is formed in a twisted shape in a direction opposite to each other, so that carbon dioxide gas and tunnel excavation wastewater pass through the fluid flow path of each of the mixing blades, and the rotation direction is changed to the opposite direction at a certain period. Tunnel excavation wastewater neutralization apparatus, characterized in that.
delete The method of claim 1,
The second mixing means is composed of a pressure increasing chamber,
The pressure increase chamber,
It includes a first to a fourth space formed by dividing a space by three barrier walls,
A pH measuring sensor and a check valve are formed in the first to third spaces,
In the second to fourth spaces, discharge pipes connected to the second transfer line are formed,
Tunnel excavation wastewater neutralization apparatus, characterized in that the solenoid valve is formed in the discharge pipe.

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