JP2020124657A - Neutralizer - Google Patents

Abstract

To efficiently neutralize wastewater.SOLUTION: A neutralizer 100 includes: a first bubbling unit 120 that supplies carbon dioxide to a part of a flow path 102 through which wastewater flows from an inflow port 102a to a discharge port 102b; a second bubbling unit 130 that supplies a smaller amount of carbon dioxide than an amount supplied by the first bubbling unit 120 from a supply point of the first bubbling unit 120 in the flow path 102 toward the discharge port 102b; a pH sensor 140 provided in the flow path 102; and a control unit 150 that controls at least an amount of carbon dioxide supplied by the second bubbling unit 130 based on a measured value of the pH sensor 140.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to neutralization devices.

Discharging wastewater of high pH (hydrogen ion index) as is is prohibited by law. For this reason, it is necessary to neutralize the wastewater having a high pH and lower the pH to the discharge standard value. High pH wastewater is the wastewater resulting from contacting cement with water.

As a technique for neutralizing the wastewater, a technique for introducing dilute sulfuric acid into the wastewater has been developed. However, since dilute sulfuric acid has a relatively high viscosity and a slow diffusion rate, a highly functional stirring device is required. In addition, handling of dilute sulfuric acid requires a work chief such as a specific chemical substance, or requires notification to the Labor Standards Inspection Office or the fire department, which places many restrictions on the user.

Therefore, a neutralization device for introducing carbon dioxide into wastewater using an ejector has been developed (for example, Patent Document 1).

Japanese Patent No. 4430204

In the above-mentioned neutralization device, development of a technique capable of efficiently neutralizing wastewater is desired.

In view of such a problem, the present disclosure aims to provide a neutralization device capable of efficiently neutralizing wastewater.

In order to solve the above problems, a neutralization device according to an aspect of the present disclosure includes a first bubbling portion that supplies carbon dioxide to a part of a flow path through which wastewater flows from an inflow port toward a discharge port; The second bubbling part that supplies a smaller amount of carbon dioxide than the supply amount of the first bubbling part to the outlet side of the supply position of the first bubbling part in the above, the pH sensor provided in the flow path, and the measured value of the pH sensor. And a control unit that controls the amount of carbon dioxide supplied by the second bubbling unit.

Further, the control unit may control the amount of carbon dioxide supplied by the first bubbling unit in addition to the second bubbling unit, based on the measured value of the pH sensor.

Further, the pH sensor may be provided between the supply location of the first bubbling section and the supply location of the second bubbling section, or between the supply location of the second bubbling section and the discharge port.

In addition, a carbon dioxide cylinder connected to both the first bubbling section and the second bubbling section may be provided.

In addition, the first bubbling portion and the second bubbling portion may supply bubbles of carbon dioxide having an average particle diameter of 2.5 mm or less to the wastewater flowing through the flow path.

Further, the inflow port may be located above the exhaust port.

According to the present disclosure, it is possible to efficiently neutralize wastewater.

It is a figure explaining the neutralization apparatus of 1st Embodiment. It is a flow chart explaining the flow of processing of the neutralization method of a 1st embodiment. It is a figure explaining the neutralization apparatus of 2nd Embodiment. It is a figure explaining the neutralization apparatus of 3rd Embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding, and do not limit the present disclosure unless otherwise specified. In this specification and the drawings, elements having substantially the same functions and configurations are designated by the same reference numerals, and a duplicate description will be omitted. Also, illustration of elements not directly related to the present disclosure is omitted.

[First Embodiment: Neutralization Device 100]
FIG. 1 is a diagram illustrating a neutralization device 100 according to the first embodiment. As shown in FIG. 1, the neutralization device 100 includes a carbon dioxide cylinder 110, a first bubbling section 120, a second bubbling section 130, a pH sensor 140, and a control section 150. Note that, in FIG. 1, solid arrows indicate the flow of wastewater. In addition, in FIG. 1, a dashed arrow indicates a signal flow.

The carbon dioxide cylinder 110 stores high-pressure compressed carbon dioxide. The carbon dioxide cylinder 110 is connected to both the first bubbling section 120 and the second bubbling section 130.

The first bubbling portion 120 and the second bubbling portion 130 supply bubbles of carbon dioxide having an average particle diameter (average bubble diameter) of 2.5 mm or less to a part of the flow path 102. The first bubbling section 120 and the second bubbling section 130 preferably supply carbon dioxide bubbles having an average particle size of less than 1 mm to the wastewater flowing through the flow path 102.

In addition, in the present embodiment, the second bubbling unit 130 supplies a smaller amount of carbon dioxide than the amount supplied by the first bubbling unit 120.

The flow path 102 is a passage through which wastewater flows. The flow path 102 is provided with an inflow port 102a and a discharge port 102b. In the present embodiment, the flow channel 102 is formed so that the inflow port 102a is located above the exhaust port 102b (in the vertical direction). More specifically, the flow path 102 is formed so that the lower end of the inlet 102a is located above the lower end of the outlet 102b. Therefore, the wastewater flows in the flow path 102 from its inflow port 102a toward its discharge port 102b by its own weight.

The first bubbling section 120 includes an air diffuser plate 122, a connecting pipe 124, and a flow rate adjusting valve 126. The air diffuser plate 122 is provided on the bottom surface of the flow path 102. The air diffuser plate 122 is made of a porous material. The porous body is made of resin, glass, ceramic, metal, or pumice stone.

The connection pipe 124 connects the carbon dioxide cylinder 110 and the diffuser plate 122. The flow rate adjusting valve 126 is provided in the connecting pipe 124. The opening degree of the flow rate adjusting valve 126 is adjusted by the control unit 150 described later. The adjustment of the opening degree of the flow rate adjusting valve 126 by the control unit 150 will be described later in detail.

The second bubbling section 130 includes an air diffuser plate 132, a connecting pipe 134, and a flow rate adjusting valve 136. The air diffuser plate 132 is provided closer to the discharge port 102b than the installation location of the air diffuser plate 122 in the flow path 102. Like the diffuser plate 122, the diffuser plate 132 is made of a porous material.

The connection pipe 134 connects the carbon dioxide cylinder 110 and the diffuser plate 132. The flow rate adjustment valve 136 is provided in the connection pipe 134. The opening of the flow rate adjusting valve 136 is adjusted by the control unit 150. The adjustment of the opening degree of the flow rate adjusting valve 136 by the control unit 150 will be described later in detail.

Therefore, when the control unit 150 opens the flow rate adjusting valve 126, the first bubbling unit 120 supplies carbon dioxide to the wastewater flowing through the flow path 102. Further, when the flow rate adjusting valve 136 is opened by the control unit 150, the second bubbling unit 130 causes the waste water flowing from the supply point (the diffuser plate 122) of the first bubbling unit 120 in the flow path 102 to the discharge port 102b side. Will be supplied with carbon dioxide.

The pH sensor 140 is provided between the supply location of the first bubbling section 120 and the supply location of the second bubbling section 130. That is, the pH sensor 140 measures the pH of the wastewater flowing between the diffuser plate 122 and the diffuser plate 132.

The control unit 150 is composed of a semiconductor integrated circuit including a CPU (central processing unit). The control unit 150 reads out a program, parameters, etc. for operating the CPU itself from the ROM. The control unit 150 cooperates with a RAM as a work area and other electronic circuits to manage and control the entire neutralization apparatus 100. The control unit 150 controls the amount of carbon dioxide supplied by the first bubbling unit 120 and the second bubbling unit 130 based on the measurement value of the pH sensor 140. In the present embodiment, the control unit 150 adjusts the openings of the flow rate adjusting valve 126 and the flow rate adjusting valve 136 based on the measured value of the pH sensor 140.

[Neutralization method]
Next, a method of neutralizing wastewater using the above neutralization apparatus 100 will be described. FIG. 2 is a flowchart illustrating a processing flow of the neutralization method of the first embodiment. As shown in FIG. 2, the neutralization method according to the present embodiment includes a first fully open determination process S110, a first opening adjustment process S120, a second fully closed determination process S130, and a second opening adjustment process S140. Including and Hereinafter, each process will be described.

[First full open determination process S110]
The control unit 150 determines whether the flow rate adjustment valve 126 of the first bubbling unit 120 is fully open. As a result, when it is determined that the flow rate adjustment valve 126 is not fully opened (NO in S110), the control unit 150 shifts the processing to the first opening adjustment processing S120. On the other hand, when determining that the flow rate adjustment valve 126 is fully opened (YES in S110), the control unit 150 shifts the processing to the second fully closed determination processing S130.

[First opening adjustment processing S120]
The control unit 150 adjusts the opening degree of the flow rate adjusting valve 126 of the first bubbling unit 120 so that the measured value of the pH sensor 140 becomes the target value. The target value is a predetermined value equal to or lower than the discharge reference value.

[Second full-closed determination process S130]
The control unit 150 determines whether or not the flow rate adjustment valve 136 of the second bubbling unit 130 is fully closed. As a result, when it is determined that the flow rate adjustment valve 136 is not fully closed (NO in S130), the control unit 150 shifts the processing to the second opening adjustment processing S140. On the other hand, when determining that the flow rate adjustment valve 136 is fully closed (YES in S130), the control unit 150 shifts the processing to the first full open determination processing S110.

[Second opening adjustment processing S140]
The control unit 150 opens the flow rate adjusting valve 136 of the second bubbling unit 130 based on the difference between the measured value of the pH sensor 140 and the target value so that the pH of the wastewater reaching the outlet 102b reaches the target value. Adjust.

As described above, the neutralization apparatus 100 according to the present embodiment and the neutralization method using the same include the first bubbling section 120 and the second bubbling section 130. The pH of the wastewater flowing through the flow path 102 equipped with the neutralization device 100 is higher on the upstream side than on the downstream side. Therefore, the first bubbling section 120 of the present embodiment supplies a larger amount of carbon dioxide than the second bubbling section 130. That is, when the wastewater can be neutralized only by the first bubbling section 120 (the pH of the wastewater can be set to the target value), the control section 150 controls only the opening degree of the flow rate adjustment valve 126 of the first bubbling section 120. On the other hand, when the waste water cannot be neutralized without using the second bubbling section 130 in addition to the first bubbling section 120, the control section 150 fully opens the flow rate adjusting valve 126 of the first bubbling section 120 and the second bubbling section 130. The opening degree of the flow rate adjusting valve 136 is adjusted. Thereby, the neutralization device 100 can efficiently neutralize the wastewater.

In addition, as described above, the neutralization device 100 includes the pH sensor 140 and the control unit 150. As a result, the neutralization device 100 can reliably set the pH of the waste water discharged from the discharge port 102b to the target value. Further, the neutralization device 100 can avoid a situation in which excess carbon dioxide is supplied to the wastewater. Therefore, the neutralization device 100 can neutralize the wastewater without wasting carbon dioxide.

Moreover, in the comparative example in which the first bubbling section 120 and the second bubbling section 130 are connected to different carbon dioxide cylinders 110 having the same capacity, the carbon dioxide cylinder 110 connected to the first bubbling section 120 and the first bubbling section The exchange frequency varies with the carbon dioxide cylinder 110 connected to the 2-bubbling unit 130. More specifically, the carbon dioxide cylinder 110 connected to the first bubbling section 120 has a higher replacement frequency than the carbon dioxide cylinder 110 connected to the second bubbling section 130. Therefore, the comparative example has a problem that the work load on the worker is increased. On the other hand, as described above, in the neutralization apparatus 100 of this embodiment, the first bubbling section 120 and the second bubbling section 130 are connected to one carbon dioxide cylinder 110. Thereby, the replacement frequency of the carbon dioxide cylinder 110 can be reduced as compared with the comparative example. Therefore, the neutralization device 100 can reduce the work load on the worker.

Further, as described above, the first bubbling portion 120 and the second bubbling portion 130 supply carbon dioxide bubbles (including micro bubbles or nano bubbles) having an average particle diameter of 2.5 mm or less to the wastewater. Therefore, the first bubbling section 120 and the second bubbling section 130 have a retention time of carbon dioxide in wastewater as compared with a conventional technique of introducing carbon dioxide by an ejector or a jet device (hereinafter referred to as “conventional technique of ejector”). Can be made longer. That is, the neutralization device 100 can prolong the contact time between waste water and carbon dioxide. Therefore, the neutralization device 100 can improve the efficiency of dissolving carbon dioxide in the wastewater. Thereby, the neutralizer 100 can continuously and efficiently neutralize the wastewater.

Further, the first bubbling portion 120 and the second bubbling portion 130 can increase the specific surface area of carbon dioxide as compared with the conventional ejector technology. Therefore, the neutralization device 100 can improve the efficiency of dissolving carbon dioxide in the wastewater.

Further, the neutralization apparatus 100 can significantly reduce the time required for neutralizing wastewater, as compared with the conventional ejector technology. Therefore, the neutralization device 100 can perform the neutralization reaction with a small amount of carbon dioxide as compared with the conventional ejector technology. Therefore, the neutralization device 100 can reduce the cost of carbon dioxide required for neutralization.

Further, as described above, the flow path 102 is formed so that the inflow port 102a is located above the exhaust port 102b. As a result, the flow path 102 can flow the wastewater by its own weight from the inflow port 102a toward the discharge port 102b. Therefore, the flow path 102 can flow the wastewater from the inflow port 102a toward the exhaust port 102b without using a driving mechanism such as a pump.

[Second Embodiment: Neutralizer 200]
In the first embodiment, the configuration in which the pH sensor 140 is provided between the supply location of the first bubbling section 120 and the supply location of the second bubbling section 130 is taken as an example. However, the pH sensor is not limited to the installation position as long as it is provided in the flow channel 102.

FIG. 3 is a diagram illustrating the neutralization device 200 of the second embodiment. As shown in FIG. 3, the neutralization device 200 includes a carbon dioxide cylinder 110, a first bubbling unit 120, a second bubbling unit 130, a pH sensor 240, and a control unit 150. Note that, in FIG. 3, solid arrows indicate the flow of wastewater. In addition, in FIG. 3, a dashed arrow indicates a signal flow.

In addition, about the component substantially equal to the said neutralization apparatus 100, the same code|symbol is attached|subjected and description is abbreviate|omitted.

The pH sensor 240 is provided between the supply location of the second bubbling section 130 and the outlet 102b. That is, the pH sensor 240 measures the pH of the wastewater flowing between the diffuser plate 132 and the outlet 102b.

Further, in the second embodiment, in the second opening adjustment processing S140, the control unit 150 adjusts the opening of the flow rate adjusting valve 136 so that the measured value of the pH sensor 240 becomes the target value.

As described above, the neutralization device 200 includes the pH sensor 240 and the control unit 150. As a result, the neutralization device 200 can reliably set the pH of the waste water discharged from the discharge port 102b to the target value. Further, the neutralization device 200 can avoid a situation in which excess carbon dioxide is supplied to the wastewater. Therefore, the neutralizer 200 can neutralize the wastewater without wasting carbon dioxide.

[Third Embodiment: Neutralizer 300]
In the above first and second embodiments, the case where the first bubbling section 120 and the second bubbling section 130 are connected to one carbon dioxide cylinder 110 has been described as an example. However, the number of carbon dioxide cylinders 110 included in the neutralizer is not limited.

FIG. 4 is a diagram illustrating a neutralization device 300 according to the third embodiment. As shown in FIG. 3, the neutralization apparatus 300 includes carbon dioxide cylinders 110A and 110B, a first bubbling section 120, a second bubbling section 130, a pH sensor 140, a control section 350, and 360. In addition, in FIG. 4, solid arrows indicate the flow of wastewater. In addition, in FIG. 4, a dashed arrow indicates a signal flow.

In addition, about the component substantially equal to the said neutralization apparatus 100, the same code|symbol is attached|subjected and description is abbreviate|omitted.

The connection pipe 124 of the first bubbling portion 120 connects the carbon dioxide cylinder 110A and the diffuser plate 122. Further, the connection pipe 134 of the second bubbling portion 130 connects the carbon dioxide cylinder 110B and the diffuser plate 132. The carbon dioxide cylinder 110A has a larger capacity than the carbon dioxide cylinder 110B.

The control units 350 and 360 are composed of semiconductor integrated circuits including a CPU (Central Processing Unit). The control units 350 and 360 read out programs and parameters for operating the CPU itself from the ROM. The control unit 350 controls the amount of carbon dioxide supplied by the first bubbling unit 120 (the opening degree of the flow rate adjusting valve 126) based on the measurement value of the pH sensor 140. The control unit 360 controls the amount of carbon dioxide supplied by the second bubbling unit 130 (the opening degree of the flow rate adjusting valve 136) based on the measurement value of the pH sensor 140.

As described above, in the neutralization device 300, the capacity of the carbon dioxide cylinder 110A connected to the first bubbling section 120 is larger than that of the carbon dioxide cylinder 110B connected to the second bubbling section 130. As a result, the replacement frequency of the carbon dioxide cylinder 110A can be reduced as compared with the comparative example in which the carbon dioxide cylinders 110 having the same capacity but different in capacity are connected. Therefore, the neutralization device 300 can reduce the work load on the worker.

The embodiments have been described above with reference to the accompanying drawings, but it goes without saying that the present disclosure is not limited to the above embodiments. It is obvious to those skilled in the art that various changes or modifications can be conceived within the scope of the claims, and it is understood that these also belong to the technical scope of the present disclosure. To be done.

For example, in the above-described embodiment, the neutralization devices 100, 200, and 300 have exemplified the configuration including the first bubbling portion 120 and the second bubbling portion 130. However, the number of bubbling parts is not limited. For example, the neutralization device may include three or more bubbling portions.

In the above embodiment, the case where the flow rate adjusting valve 126 is fully opened has been described as an example. However, as long as the first bubbling section 120 can supply a larger amount of carbon dioxide than the second bubbling section 130, the opening degree of the flow rate adjusting valve 126 is not limited.

Moreover, in the said embodiment, the 1st bubbling part 120 and the 2nd bubbling part 130 mentioned the structure provided with the diffuser plates 122 and 132 as an example. However, the first bubbling portion 120 and the second bubbling portion 130 may include air diffusers instead of the air diffusers 122 and 132.

Moreover, in the said embodiment, the structure which the neutralization apparatus 100,200,300 provided with the carbon dioxide cylinder 110,110A,110B was mentioned as the example. As described above, the neutralization apparatuses 100, 200, and 300 include the carbon dioxide cylinders 110, 110A, and 110B, so that the first bubbling unit 120 and the second bubbling unit 130 pressure-feed carbon dioxide without using a pump. be able to. However, the neutralization devices 100, 200, and 300 are replaced with carbon dioxide cylinders 110, 110A, and 110B in place of atmospheric pressure carbon dioxide, or a storage part that stores carbon dioxide having a low compression rate, or atmospheric pressure carbon dioxide. A generator for generating carbon or carbon dioxide having a low compressibility may be provided. In this case, the first bubbling portion 120 and the second bubbling portion 130 are configured to include a pump, and drive the pump to oxidize the gas from the storage portion or the generating device to the connecting pipes 124 and 134 (air diffuser plates 122 and 132). It is good to pump carbon.

In the above embodiment, the case where the first bubbling section 120 and the second bubbling section 130 supply bubbles of carbon dioxide having an average particle size of 2.5 mm or less is taken as an example. However, the particle size of carbon dioxide supplied by the first bubbling section 120 and the second bubbling section 130 is not limited.

Further, in the above embodiment, the case where the inlet 102a of the flow path 102 is located above the outlet 102b has been described as an example. However, the positions of the inlet 102a and the outlet 102b are not limited. For example, the inlet 102a may be located below the outlet 102b. In this case, the neutralization devices 100, 200, 300 may include a pump that causes waste water to flow into the flow path from the inflow port toward the exhaust port.

The present disclosure can be used in a neutralization device.

100 Neutralizer 102 Flow path 102a Inlet 102b Discharge 110 Carbon dioxide cylinder 120 First bubbling section 130 Second bubbling section 140 pH sensor 150 Control section 200 Neutralization apparatus 240 pH sensor 300 Neutralization apparatus 350 Control section 360 Control section

Claims (6)

A first bubbling section for supplying carbon dioxide to a part of a flow path through which wastewater flows from an inlet to an outlet,
A second bubbling portion that supplies a smaller amount of carbon dioxide than the amount supplied by the first bubbling portion to the discharge port side from the supply location of the first bubbling portion in the flow path,
A pH sensor provided in the flow path,
A control unit for controlling at least the amount of carbon dioxide supplied by the second bubbling unit based on the measured value of the pH sensor;
Neutralizer equipped with. The neutralization device according to claim 1, wherein the control unit controls the amount of carbon dioxide supplied by the first bubbling unit in addition to the second bubbling unit, based on the measurement value of the pH sensor. The pH sensor is provided between a supply point of the first bubbling section and a supply point of the second bubbling section, or between a supply point of the second bubbling section and the discharge port. The neutralization device according to 2. The neutralization device according to claim 1, further comprising a carbon dioxide cylinder connected to both the first bubbling section and the second bubbling section. The first bubbling section and the second bubbling section supply bubbles of carbon dioxide having an average particle size of 2.5 mm or less to the wastewater flowing through the flow path. Neutralizer. The neutralization device according to claim 1, wherein the inflow port is located above the discharge port.

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