JP5425557B2 - Neutralizer - Google Patents

Description

  The present invention relates to a neutralization processing apparatus.

  Conventionally, the alkaline drainage generated at a construction site or the like has been subjected to a neutralization treatment in which the pH value is lowered to a regulation value or less by a neutralization processing device that mixes carbon dioxide gas into the drainage and then discharged.

  As the neutralization treatment device, for example, in the carbon dioxide neutralization device in which carbon dioxide gas is mixed into the alkaline wastewater and neutralized, the wastewater is pumped from the alkaline wastewater storage tank and fed to the flow path. There is known a method in which carbon dioxide gas is blown from a nozzle in a flow path and mixed (stirred) by a mixer (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 5-23674

  Here, in the neutralization treatment apparatus described in Patent Document 1, the pump is driven to pump up a predetermined amount of wastewater to be neutralized, and the pumped amount of wastewater and carbon dioxide are neutralized. The driving force of the pump was required. Further, since the neutralization apparatus agitates the waste water and carbon dioxide gas by the mixer, the driving force of the mixer is also required.

  Moreover, in the neutralization processing apparatus described in Patent Document 1, generally, for example, when neutralizing alkaline drainage having a pH of about 9.3 or more, the neutralization treatment is repeatedly performed a plurality of times in a short time. A large amount of carbon dioxide gas is used at one time. That is, it is necessary to vaporize not only carbon dioxide vaporized by evaporation in the cylinder but also liquefied carbon dioxide gas before vaporization mixed in the cylinder using a vaporizer or the like. Furthermore, in order to prevent freezing due to decompression of the carbon dioxide gas that is performed during the vaporization by the vaporizer, it is necessary to heat the vaporizer by attaching a heater.

  That is, the conventional neutralization apparatus requires a drive source for driving a heater, a pump, a mixer, and the like.

By the way, since such a neutralization processing apparatus is generally removed with the completion of construction, the neutralization treatment is performed on, for example, alkaline drainage having a pH of about 9.3 or less remaining after the completion of construction. In order to apply, it is necessary to install a neutralization apparatus again.
However, as described above, when installing a conventional neutralization treatment apparatus, it is necessary to secure a drive source. Therefore, in a situation where construction has been completed and various facilities have been removed, it may be difficult to secure the drive source. There existed a problem that it existed and the neutralization process of the said waste_water | drain cannot be implemented easily.

  The subject of this invention is providing the neutralization processing apparatus which can implement | achieve the neutralization process of alkaline waste_water | drain easily without using a drive source.

In order to solve the above problems, the invention described in claim 1
Extracting carbon dioxide vaporized from a cylinder filled with carbon dioxide, adjusting the pressure of the extracted carbon dioxide with a pressure regulator, and neutralizing the carbon dioxide that has been subjected to pressure reduction into alkaline drainage. In the sum processing device,
A heat exchanging unit that is attached to the pressure regulator and exchanges heat of the carbon dioxide gas that has been pressure-reduced by the pressure regulator by atmospheric heat;
A water flow portion formed by piping that communicates with a water inlet for introducing the waste water from the outside and a water outlet for discharging the introduced waste water to the outside, and that is inclined so that the water inlet side is located above the side of the water outlet. ,
A mixing section for mixing the carbon dioxide gas heat-exchanged in the heat exchange section into the waste water in the flowing water section;
With
The mixing part is
An introduction pipe for communicating the pressure regulator and the flowing water part and introducing the carbon dioxide gas into the flowing water part;
An extension part connected to the end part of the introduction pipe on the side of the flowing water part and extending in the flow-down direction of the drainage in the flowing water part,
A plurality of the extending portions are provided at predetermined intervals along the flow-down direction of the drainage, and the discharging portions are configured to disperse and release the carbon dioxide gas.

Furthermore, the invention of claim 1
In the pipe of the flowing water part, a weir for blocking the drainage is provided on the downstream side of the extending part, the height of which is set higher than that of the discharge part.

According to the present invention, in the neutralization apparatus, the carbon dioxide gas that has been pressure-reduced by the pressure regulator is accompanied by a decrease in temperature, but heat exchange with the atmospheric heat is performed by the heat exchange unit, so freezing is prevented without using a heater. can do. In addition, since the water inlet side of the flowing water portion by piping is inclined so as to be positioned above the drain port side, there is no need to pump up a predetermined amount of waste water to be neutralized by the pump. Further, since the carbon dioxide gas can be dispersed and discharged by the discharge portion and mixed into the waste water, it is not necessary to stir the waste water and the carbon dioxide gas by the mixer. That is, neutralization treatment of alkaline wastewater can be realized without using a drive source such as a heater, pump, mixer, or the like.
Therefore, it can be said that the present invention is a neutralization treatment apparatus that can easily achieve neutralization treatment of alkaline wastewater without using a drive source.
Moreover, in the pipe of the flowing water part, a weir for blocking drainage is provided downstream of the extending part, and the height of the weir is set to be higher than the discharge part provided in the extending part, Since the water level of the waste water flowing below the extending portion is raised by the weir, the carbon dioxide gas released from the discharge portion can be mixed.
Further, since the drainage flows upward and downward in order to pass through the weir, the stirrability with the carbon dioxide gas is enhanced as compared with the case where it flows linearly in the inclined direction in the pipe of the flowing water part.

It is a front view which shows schematic structure of the neutralization processing apparatus which concerns on this invention. It is a figure which shows the state which looked at the pressure regulator which concerns on this invention from the top.

Hereinafter, specific embodiments of the neutralization processing apparatus according to the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.
In the following description, the left-right direction of the neutralizing apparatus 1 in FIG. 1 is defined as the X-axis direction, the front-rear direction is defined as the Y-axis direction, and the vertical direction is defined as the Z-axis direction.

  As shown in FIG. 1, the neutralization treatment apparatus 1 includes, for example, a plurality of neutralization units 5 that neutralize carbon dioxide mixed with alkaline (for example, a pH value of about 9.3) wastewater, and from the upstream side. Impermeable concrete 60 (water inlet) that restricts the cross-sectional area of the drainage flowing down toward the downstream side (in the direction of arrow A), and a flowing water section 50 that is provided downstream of the impermeable concrete 60 and allows the drainage to flow down. And an upstream side sampling pipe 70 and a downstream side sampling pipe 80 for collecting the drainage in the flowing water part 50, a drain outlet 90 for discharging the drainage flowing down the flowing water part 50 to the outside, and the like. The alkaline drainage discharged from construction facilities that flow in more is neutralized and discharged.

  The neutralization unit 5 includes a cylinder 10 filled with carbon dioxide gas, a pressure regulator 20 that performs pressure adjustment of the carbon dioxide gas ejected from the cylinder 10, and a flow meter that measures the flow rate of carbon dioxide gas that has passed through the pressure regulator 20. 30, a mixing unit 40 that mixes carbon dioxide gas that has passed through the flow meter 30 into the wastewater, and the like, and a plurality of them are arranged in series along the flow direction of the wastewater.

The cylinder 10 includes a container valve 11 and is a gas cylinder filled with a liquefied carbon dioxide gas and a carbon dioxide gas vaporized by evaporation of the liquefied carbon dioxide gas.
The container valve 11 is a valve for taking out the carbon dioxide gas in the cylinder 10 by opening and closing. That is, by adjusting the opening / closing amount of the container valve 11, it is possible to take out only the carbon dioxide gas evaporated in the cylinder 10 and introduce the taken carbon dioxide gas into the pressure regulator 20.

FIG. 2 is a diagram showing a state in which the pressure regulator according to the present invention is viewed from above.
As shown in FIG. 2, the pressure regulator 20 includes a pressure regulator 21 and a heat exchanger 25, and performs pressure regulation (decompression regulation) of carbon dioxide introduced from the cylinder 10 to perform the flow meter 30. To introduce.
The pressure adjustment unit 21 includes a pressure adjustment handle (not shown) that adjusts the pressure of the introduced gas to a predetermined value and a pressure gauge (not shown) that measures and displays the pressure of the gas. The reduced pressure of the introduced carbon dioxide gas is adjusted.
The heat exchanging unit 25 is attached to the rear of the pressure adjusting unit 21 (Y-axis positive direction), has a plurality of heat transfer fins at predetermined intervals on the peripheral surface of the cylindrical member, and uses the atmospheric heat as a heat source as a pressure adjusting unit. 21 is a heat exchanger that performs heat exchange of carbon dioxide gas whose pressure is adjusted at 21.
That is, the carbon dioxide gas whose pressure is adjusted by the pressure adjusting unit 21 may be frozen due to a temperature drop caused by the pressure reduction, but the heat exchange with the atmospheric heat is performed by the heat exchanging unit 25 to prevent the freezing. Is possible.
In addition, the alkaline drainage discharged | emitted from construction facilities etc. shows the weak alkalinity whose pH value is about 9.3 or less in many cases, for example. Therefore, it is not necessary to take out the liquefied carbon dioxide filled in the cylinder 10 and vaporize it with a vaporizer or the like because the neutralization treatment for the waste water can be achieved by mixing the carbon dioxide vaporized in the cylinder 10. Only pressure reduction adjustment by the pressure regulator 20 is performed.

  The flow meter 30 measures the flow rate of the carbon dioxide gas whose pressure is adjusted by the pressure regulator 20.

  The mixing unit 40 includes an introduction pipe 41 and a disperser 42, introduces carbon dioxide gas that has passed through the flow meter 30 into the flowing water unit 50 described later, and mixes the waste water flowing down the flowing water unit 50. .

  The introduction pipe 41 is a pipe that communicates the pressure regulator 20 and the flowing water part 50 and introduces carbon dioxide into the flowing water part 50.

  The disperser 42 is, for example, an air stone provided with a plurality of fine holes in a tubular ceramic material or the like, and includes an extending portion 43 and a plurality of discharge portions 44, and is introduced from the introduction pipe 41. Carbon dioxide gas is dispersed and foamed and discharged into the flowing water part 50.

  The extending portion 43 is a pipe formed of a ceramic material or the like that is connected to the end portion of the introduction pipe 41 on the flowing water portion 50 side and extends in the direction in which the drainage flows.

For example, a plurality of discharge portions 44 are provided at the upper end of the extending portion 43, and a plurality of discharge portions 44 are provided at predetermined intervals along the direction in which the drainage flows. The discharge part 44 is introduced into the flowing water part 50 by the introduction pipe 41, and the carbon dioxide gas conveyed in the flow direction of the wastewater by the extending part 43 is dispersed as fine bubbles (dispersed and foamed) and is upward (Z axis). This is a discharge port for discharging in the positive direction. Note that the size of the bubbles released from the discharge portion 44 can be adjusted by making the diameter of the discharge portion 44 a desired size.
In other words, compared with the case where the carbon dioxide gas introduced into the flowing water part 50 is directly mixed into the wastewater from one place, the carbon dioxide gas is dispersed and mixed along the flow direction of the wastewater by the plurality of discharge parts 44, so that the wastewater and It is possible to increase the contact area with the carbon dioxide gas, thereby improving the dissolution rate between the waste water and the carbon dioxide gas.

  The impermeable concrete 60 is a concrete member that includes a cylindrical cavity portion 61 having a diameter that matches a pipe cross-sectional area of the flowing water portion 50 to be described later, and restricts the inflow of drainage that flows down from the upstream side. .

  The flowing water part 50 is configured to include, for example, a siphon part 55 and a weir 58, and communicates with the water-impervious concrete 60 and a later-described drain port 90, and the impermeable concrete 60 side is more than the drain port 90 side. It is piping inclined so that it may be located upwards. Therefore, the neutralization can be performed by flowing the waste water flowing in from the impermeable concrete 60 side to the drain port 90 and mixing the carbon dioxide gas released from the discharge part 42 in the meantime.

The weir 58 is installed on the downstream side of the disperser 42 in the flowing water part 50, stops the drainage contacted from the upstream side, pushes it upward (Z-axis positive direction), and drains the wastewater that has passed through the weir 58. Pull downward (Z-axis negative direction).
For example, the height of the weir 58 is set to be higher than the discharge portion 44 provided in the extending portion 43.
Therefore, since the water level of the waste water flowing below the extending portion 43 is raised by the weir 58, carbon dioxide gas released from the discharge portion 44 can be mixed.
Further, since the drainage flows upward and downward in order to pass through the weir 58, the stirrability with the carbon dioxide gas is enhanced as compared with the case where the drainage flows linearly in the inclined direction of the flowing water part 50.

The siphon portion 55 is a piping portion that is bent so that the water level on the introduction side of the wastewater is higher than that on the outlet side and between the introduction side and outlet side is higher than both water levels.
That is, when drainage passes through the siphon part 55, the section from the introduction side of the siphon part 55 to the highest point of the highest water level becomes full, so the contact time between the drainage and carbon dioxide increases, It becomes possible to promote mixing. Further, since the pressure of the drainage increases due to the change of the water level in the siphon part 55, it becomes easy to mix carbon dioxide gas and the dissolution rate can be improved.

The upstream water sampling pipe 70 is a pipe that communicates the cavity 61 of the impermeable concrete 60 with the outside and collects drainage flowing down the cavity 61.
The downstream side sampling pipe 80 is a pipe that is provided near the drain outlet 90 and collects drainage flowing through the vicinity of the drain outlet 90 through the outside and the flowing water section 50.
That is, a pH sensor or the like (not shown) is attached to the upper end side (Z-axis positive direction) of the upstream-side water sampling pipe 70 and the downstream-side water sampling pipe 80, and is collected at each of the upstream-side water sampling pipe 70 and the downstream-side water sampling pipe 80. By measuring the pH value of the wastewater with the pH sensor, it is possible to easily grasp the amount of change in the pH value of the wastewater before and after the neutralization treatment by the neutralization treatment apparatus 1.

  The drainage port 90 flows down the flowing water part 50 and drains the wastewater neutralized by the neutralizing part 5 to the downstream side.

Next, operation | movement of the neutralization processing apparatus 1 is demonstrated.
Here, alkaline drainage discharged from construction facilities or the like often exhibits weak alkalinity having a pH value of about 9.3 or less, for example. Therefore, here, the pH value measured at the position of the upstream side sampling pipe 70 is, for example, 9.3, and the target pH value (regulation value) is, for example, about 6.5 to 8.5. Moreover, only one set of the neutralization part 5 shall be arrange | positioned.

First, the container valve 11 is adjusted from the cylinder 10 to take out a predetermined amount (for example, 0.25 m ³ / min) of vaporized carbon dioxide gas.
Next, the carbon dioxide gas is pressure-reduced by the pressure adjusting unit 21, heat exchange by atmospheric heat is performed by the heat exchanging unit 25, and the flow rate is measured by the flow meter 30.
Next, the carbon dioxide gas is introduced into the flowing water part 50 through the introduction pipe 41 of the mixing part 40, and dispersed and foamed by the discharge parts 44 of the disperser 42 provided at a predetermined interval (for example, four places at 1m intervals). And discharged into the flowing water part 50.

Next, the carbon dioxide gas flows in from the impermeable concrete 60 and is mixed (neutralized) into drainage (for example, a flow rate of 35 m ³ / h) flowing down the flowing water part 50. The dissolution rate of carbon dioxide and waste water is increased by passing through the weir 58 and the siphon unit 55.
Next, the user measures the pH value at the position of the downstream side sampling pipe 80, and determines whether or not the target pH value has been reached by the neutralization process. Assuming that the dissolution rate of waste water and carbon dioxide gas is 1, the pH value of the waste water is lowered to 7 by the neutralization treatment based on the set value, and can sufficiently reach the target pH value.

  Here, when it is determined that the user has not reached the target pH value, for example, as shown in FIG. 1, a plurality of neutralization units 5 are arranged in series along the flow direction of the waste water, thereby achieving the target Adjust so that the pH value can be obtained.

  Then, the waste water that has been adjusted and reaches the target pH value is discharged to the outside through the drain port 90.

The neutralization processing apparatus 1 according to the present embodiment described above is attached to the pressure regulator 20, and a heat exchange unit 25 that performs heat exchange of carbon dioxide gas that is pressure-reduced by the pressure regulator 21 using atmospheric heat as a heat source; A flowing water part 50 that inclines so that the impermeable concrete 60 side is positioned above the drain outlet 90, and a mixing part 40 that mixes carbon dioxide heat-exchanged in the heat exchange part 25 into the waste water in the flowing water part 50; The mixing unit 40 communicates with the pressure regulator 20 and the flowing water unit 50 and is connected to an introduction pipe 41 that introduces carbon dioxide into the flowing water part 50 and an end of the introducing pipe 41 on the flowing water part 50 side. A plurality of extending portions 43 extending in the drainage direction of the waste water in the portion 50; and a plurality of discharge portions 44 provided in the extension portion 43 at predetermined intervals along the drainage direction of the drainage and dispersing and releasing carbon dioxide gas. It is configured.
That is, the carbon dioxide gas taken out from the cylinder 10 is accompanied by a temperature drop when the pressure regulator 20 is adjusted to reduce the pressure. However, since the heat exchange is performed by the heat exchanger 25 using the atmospheric heat as a heat source, freezing can be prevented. it can. Moreover, since the water-impregnated concrete 60 side of the flowing water part 50 is inclined so as to be positioned above the drain outlet 90 side, it is not necessary to pump up a predetermined amount of waste water to be neutralized by a pump or the like. Further, since carbon dioxide gas can be dispersed and released by the discharge portion 44 and mixed into the wastewater, there is no need to stir the wastewater and carbon dioxide gas by a mixer or the like. That is, neutralization treatment of alkaline wastewater can be realized without using a drive source such as a heater, pump, mixer, or the like.
Therefore, it can be said that the present invention is a neutralization treatment apparatus that can easily achieve neutralization treatment of alkaline wastewater without using a drive source.

The discharge part 44 discharges carbon dioxide gas by dispersing and foaming.
That is, since the carbon dioxide gas can be dispersed as fine bubbles by the discharge portion 44 and mixed into the wastewater, the contact area between the wastewater and the carbon dioxide gas can be increased, thereby dissolving the wastewater and the carbon dioxide gas. The rate can be improved.

In addition, the flowing water part 50 includes a siphon part 55 on the downstream side of the extending part 43.
That is, when drainage passes through the siphon part 55, the section from the introduction side of the siphon part 55 to the highest point of the highest water level becomes full, so the contact time between the drainage and carbon dioxide increases, It becomes possible to promote mixing. Further, since the pressure of the drainage increases due to the change of the water level in the siphon part 55, it becomes easy to mix carbon dioxide gas and the dissolution rate can be improved.

Further, the flowing water part 50 includes a weir 58 that dams the drainage downstream of the extending part 43, and the height of the weir 58 is set to be higher than the discharge part 44 provided in the extending part 43, for example. ing.
Therefore, since the water level of the waste water flowing below the extending portion 43 is raised by the weir 58, carbon dioxide gas released from the discharge portion 44 can be mixed.
Further, since the drainage flows upward and downward in order to pass through the weir 58, the stirrability with the carbon dioxide gas is enhanced as compared with the case where the drainage flows linearly in the inclined direction of the flowing water part 50.

Moreover, the neutralization part 5 containing the heat exchange part 25 and the mixing part 40 is provided with two or more in series along the flow direction of waste_water | drain.
That is, even if the neutralization treatment by the neutralization unit 5 is performed on the wastewater, if the target drainage pH value is not reached, the pH value is easily reached by increasing the number of neutralization units 5 installed. Can be adjusted as follows.

The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
For example, the number of arrangements of the weirs and siphon units can be appropriately increased or decreased, and it is of course possible to provide only at least one of the weirs and siphon units.

DESCRIPTION OF SYMBOLS 1 Neutralization processing apparatus 5 Neutralization part 10 Cylinder 20 Pressure regulator 25 Heat exchanger 40 Mixing part 41 Introducing pipe 42 Dispersor 43 Extending part 44 Discharge part 50 Flowing part 55 Siphon part 58 Weir 60 Impermeable concrete (water inlet)
90 Drainage port

Claims (1)

Extracting carbon dioxide vaporized from a cylinder filled with carbon dioxide, adjusting the pressure of the extracted carbon dioxide with a pressure regulator, and neutralizing the carbon dioxide that has been subjected to pressure reduction into alkaline drainage. In the sum processing device,
A heat exchanging unit that is attached to the pressure regulator and exchanges heat of the carbon dioxide gas that has been pressure-reduced by the pressure regulator by atmospheric heat;
A water flow portion formed by piping that communicates with a water inlet for introducing the waste water from the outside and a water outlet for discharging the introduced waste water to the outside, and that is inclined so that the water inlet side is located above the side of the water outlet. ,
A mixing section for mixing the carbon dioxide gas heat-exchanged in the heat exchange section into the waste water in the flowing water section;
With
The mixing part is
An introduction pipe for communicating the pressure regulator and the flowing water part and introducing the carbon dioxide gas into the flowing water part;
An extension part connected to the end part of the introduction pipe on the side of the flowing water part and extending in the flow-down direction of the drainage in the flowing water part,
A plurality of discharge portions provided at predetermined intervals along the flow direction of the drainage in the extending portion, and discharging the carbon dioxide gas;
A neutralization processing apparatus comprising:
The neutralization apparatus characterized by including a weir for damming the drainage, which is set so that the height is higher than the discharge part, in the pipe of the flowing water part , on the downstream side of the extending part. .

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