Dialysis wastewater neutralization system, dialysis wastewater neutralization method, and dialysis wastewater neutralization program

Abstract

To provide a technique capable of preventing a decrease in the neutralizing effect of carbonated water even when a dialysis machine room for producing carbonated water is located in a place away from a dialysis device. [Solution] The dialysis wastewater neutralization system includes a nanobubble device 4 that generates nanobubble carbonated water by using water and carbon dioxide gas to generate nanobubbles, and a control device 1 that neutralizes the wastewater discharged from the dialysis device 7 by introducing the nanobubble carbonated water into a drainage line L2 that discharges wastewater from the dialysis device 7, or into another drainage line L1 different from the drainage line L2, when cleaning the dialysis device 7.

Description

[Technical Field]

[0001] The present invention relates to a dialysis wastewater neutralization system, a dialysis wastewater neutralization method, and a dialysis wastewater neutralization program. [Background technology]

[0002] Dialysis machines used in dialysis treatment are cleaned with chlorine-based disinfectants such as sodium hypochlorite, as well as acidic disinfectants such as acetic acid. Therefore, the wastewater discharged from the dialysis machine during cleaning contains wastewater from chlorine-based disinfectants and acidic disinfectants. Such wastewater exceeds the pH standard set by the Sewerage Act and cannot be directly discharged into the sewer or other external sources; it must be treated to ensure that the wastewater does not exceed the pH standard.

[0003] Patent Document 1 describes a dialysis wastewater storage device for treating wastewater from a dialysis machine. Patent Document 2 describes a technique for neutralizing wastewater from a dialysis machine. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-210682 [Patent Document 2] Japanese Patent Publication No. 2021-194628 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, a medical facility equipped with many dialysis machines (dialysis beds) discharges a large amount of wastewater to be treated, and therefore requires a large-scale wastewater treatment facility equipped with a large-capacity tank. However, a dialysis clinic (medical facility) that is a tenant in a building does not have the space to install a large-scale wastewater treatment facility, and it is difficult to carry out large-scale installation work.

[0006] In Patent Document 2, carbonated water is used to neutralize effluent from chlorine-based disinfectants. Carbonated water has the property of losing carbon dioxide when it comes into contact with air, and the neutralizing effect of carbonated water decreases as the carbon dioxide is lost. To shorten the time that carbonated water is exposed to air, it is preferable to locate the dialysis machine room where the carbonated water is produced near the dialysis machine.

[0007] However, in dialysis clinics that are located in tenant buildings, the dialysis machine room and the dialysis machine may be located apart (for example, on different floors) due to space constraints. In this case, the carbonated water dispensed from the dialysis machine room may lose its carbon dioxide before reaching the dialysis machine's wastewater, reducing its neutralizing effect.

[0008] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a technology that can prevent a decrease in the neutralizing effect of carbonated water even when the dialysis machine room that produces carbonated water is located away from the dialysis device. [Means for solving the problem]

[0009] In order to solve the above problems, one aspect of the present invention is a dialysis wastewater neutralization system, which includes a nanobubble device that generates nanobubble carbonated water by using water and carbon dioxide gas to generate nanobubbles, and a control device that, when cleaning the dialysis device, introduces the nanobubble carbonated water into a drainage line that discharges wastewater from the dialysis device, or into another drainage line different from the drainage line, to neutralize the wastewater discharged from the dialysis device.

[0010] One aspect of the present invention is a method for neutralizing dialysis wastewater carried out by a control device, in which, during cleaning of a dialysis device, water and carbon dioxide gas are supplied to a nanobubble device to drive the nanobubble device, and nanobubbled carbonated water produced by the nanobubble device is poured into a drainage line for discharging wastewater from the dialysis device or another drainage line different from the drainage line, thereby neutralizing the wastewater discharged from the dialysis device. [Effects of the Invention]

[0011] According to the present invention, a technology can be provided that can prevent a decrease in the neutralizing effect of carbonated water even when the dialysis machine room that produces carbonated water is located away from the dialysis device. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is an overall configuration diagram of a dialysis wastewater neutralization system according to an embodiment of the present invention. [Figure 2] FIG. 10 is a graph showing an example of changes in the pH value of wastewater discharged from a dialysis machine during cleaning. [Figure 3] 4 is a flowchart showing a neutralization process of the control device of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0014] (System configuration) In this embodiment, weakly acidic nanobubbled carbonated water is used as a neutralizer for the wastewater (effluent) of chlorine-based disinfectants used to clean dialysis machines. A nanobubble device is used to create the carbonated water, which is then nanobubbled. Nanobubble carbonated water, in which carbon dioxide (air bubbles) are dissolved in water at nanoscale, retains carbon dioxide in the water for a long period of time. Therefore, the nanobubbled carbonated water created in the dialysis machine room can neutralize the wastewater from the dialysis machine without the carbon dioxide escaping into the air (without a decrease in neutralizing effect), even if the dialysis machine is located in a remote location and is exposed to air for a certain period of time.

[0015] Therefore, in this embodiment, the dialysis machine room that produces carbonated water can be flexibly located away from the dialysis machine. In other words, the dialysis wastewater neutralization system of this embodiment can be easily introduced even in medical institutions (such as dialysis clinics) that occupy multiple floors in a building with a small floor area per floor.

[0016] 1 is a diagram showing the configuration of a dialysis wastewater neutralization system according to this embodiment. The dialysis wastewater neutralization system (hereinafter referred to as "the system") according to this embodiment comprises a control device 1, a water supply unit 2, a carbon dioxide gas supply unit 3, a nanobubble device 4, and a solution storage unit 5. The control device 1 is connected to the nanobubble device 4 so as to be able to communicate with it wirelessly or via a wire.

[0017] The system may include pumps P1 and P2, valves SV1-SV4, and flow meters R1-R4 as needed. The control device 1 may be connected to the pumps P1 and P2, the valves SV1-SV4, and the flow meters R1-R4 so as to be able to communicate with them wirelessly or via wires.

[0018] The control device 1, water supply unit 2, carbon dioxide gas supply unit 3, nanobubble device 4, and solution storage unit 5 of this system may be placed in the dialysis machine room or may be placed in several different locations. Even if the space in the dialysis machine room is too small to install all of the devices in the room, they can be placed in other locations, making this system easy to install even in small-scale dialysis facilities operating in limited space.

[0019] Nanobubbled carbonated water (hereinafter referred to as "nanobubble carbonated water") created by the nanobubble device 4 is introduced into the drain line L1 via pump P1, valve SV3, and flow meter R1. The weak alkaline neutralizing agent stored in the solution storage unit 5 is introduced into the drain line L1 via pump P2, valve SV4, and flow meter R2. The drain line L1 is a pipe for discharging wastewater and the neutralizing agent (nanobubble carbonated water, weak alkaline neutralizing agent), and is connected to a main drain line L3. The neutralizing agent introduced into the drain line L1 flows through the main drain line L3 into the drain tank 8.

[0020] A dialysate supplying device 6 may be placed in the dialysis machine room. The dialysate supplying device 6 is a device that supplies dialysate to the dialysis machine 7. The dialysate supplying device 6 is cleaned in the same manner as the dialysis machine 7, and during this cleaning, wastewater containing a chlorine-based disinfectant or wastewater containing an acid-based disinfectant is discharged into a drain line L1. The dialysate supplying device 6 may be placed near the dialysis machine 7, and the wastewater during cleaning may be discharged into a drain line L2.

[0021] In the illustrated example, the dialysis machine room is located on the Mth floor (any floor) of the building 100. The dialysis machine 7 is located on the Nth floor (any floor) of the building 100. When the dialysis machine 7 is cleaned, wastewater containing a chlorine-based disinfectant or an acid-based disinfectant is discharged into the drain line L2. The drain line L2 is a pipe for discharging wastewater and is connected to the main drain line L3.

[0022] In the illustrated example, the dialysis machine 7 is located on the Nth floor below the dialysis machine room on the Mth floor, but this is not limiting. The dialysis machine 7 may be located on the same Mth floor as the dialysis machine room, or on a floor above the Mth floor of the dialysis machine room. Furthermore, the Nth floor of the dialysis machine 7 and the Mth floor of the dialysis machine room do not have to be on consecutive floors, and there may be another floor between the Nth floor and the Mth floor.

[0023] The drainage lines L1 and L2 are connected to a main drainage pipe L3, and the wastewater and nanobubble carbonated water are discharged through the main drainage pipe L3 to a drainage tank 8 or to the outside. Specifically, the drainage lines L1 and L2 on each floor are connected to the main drainage pipe L3 that is installed vertically in the building 100. The drainage lines L1 and L2 are installed on the corresponding floors. The main drainage pipe L3 is connected to a drainage tank 8 installed in the basement (or first floor) of the building 100. The wastewater and neutralizing agent flowing through the main drainage pipe L3 are discharged to the outside, such as a sewer, via the drainage tank 8. Note that the building 100 may not have a drainage tank 8, and the wastewater from the main drainage pipe L3 may be discharged directly to the outside.

[0024] The wastewater discharged from the dialysis machine 7 includes dialysis wastewater generated during dialysis treatment and cleaning wastewater discharged during cleaning of the dialysis machine 7. The cleaning wastewater includes alkaline wastewater discharged when cleaning with a chlorine-based disinfectant and acidic wastewater discharged when cleaning with an acidic disinfectant such as acetic acid. For example, a sodium hypochlorite aqueous solution can be used as the chlorine-based disinfectant, and for example, acetic acid can be used as the acidic disinfectant.

[0025] 2 is a diagram showing an example of the change in pH (hydrogen ion concentration) value of the wastewater discharged from the dialysis device 7 during cleaning with a sodium hypochlorite aqueous solution. When the dialysis device 7 is cleaned with a sodium hypochlorite aqueous solution, the pH of the wastewater discharged from the dialysis device 7 rises sharply.

[0026] The control device 1 neutralizes the wastewater in the drainage lines L1 and L2 and treats the wastewater so that the pH falls within the standard value (pH 5-9) specified by the Sewerage Act.

[0027] The cleaning of the dialysis machine 7 and the dialysis fluid supply device 6 (hereinafter also referred to as "dialysis machine, etc.") is carried out in a set process. When cleaning using a chlorine-based disinfectant, the dialysis machine, etc. is first cleaned with RO water for a set time, then with a chlorine-based disinfectant for a set time, and then again with RO water for a set time. Cleaning using an acid-based disinfectant is also carried out in a similar process. In this way, all cleaning is carried out under timer control.

[0028] When cleaning with a chlorine-based disinfectant, the pH of the wastewater discharged from the dialysis machine or the like exceeds 9, while when cleaning with an acid-based disinfectant, the pH of the wastewater is lower than 5. In this embodiment, when a chlorine-based disinfectant or an acid-based disinfectant is used, the control device 1 introduces a corresponding neutralizing agent into the drain line L1. As a result, in this embodiment, the pH of the wastewater from the dialysis machine or the like flowing through the main drain pipe L3 is appropriately controlled to 5 to 9.

[0029] The illustrated control device 1 includes an input receiving unit 11, a start control unit 12, a neutralization processing unit 13, a monitoring unit 14, and a storage unit 15.

[0030] The input receiving unit 11 receives a cleaning schedule for the dialysis machine, etc., input by the user and stores it in the memory unit 15. For example, suppose that cleaning of the dialysis machine, etc., is performed alternately every day at a predetermined time using a chlorine-based disinfectant and an acid-based disinfectant. That is, one of the cleaning methods is performed for each day of the week. As an example, cleaning is performed using a chlorine-based disinfectant on Mondays, Wednesdays, and Fridays, cleaning is performed using an acid-based disinfectant on Tuesdays, Thursdays, and Saturdays, and neither cleaning method is performed on Sundays. In this case, the cleaning schedule includes the time and duration of the introduction of the neutralizing agent into the drain line L1 and the type of neutralizing agent for each day of the week. Note that the cleaning schedule may be set separately for the dialysis fluid supply device 6 and the dialysis machine 7.

[0031] Monday, Wednesday, Friday: Start time of injection (XX:XX:XX), injection duration (XX minutes), neutralizer (nano bubble carbonated water) Tuesday, Friday, Saturday: Start time of injection (YY:YY:YY), injection duration (YY minutes), neutralizer (sodium bicarbonate solution) Sun: No washing

[0032] The activation control unit 12 controls the neutralization processing unit 13 based on the schedule stored in the storage unit 15 and the current date and time (day of the week, current time). That is, the activation control unit 12 has a timer function. For example, the activation control unit 12 sends a neutralization instruction to the neutralization processing unit 13 at the timing set in the schedule. The neutralization instruction may include, for example, the type of neutralizing agent, the time of injection, etc.

[0033] The neutralization treatment unit 13 injects a neutralizing agent into the drain line L1 in response to a neutralization instruction from the start-up control unit 12. In this embodiment, a weakly acidic neutralizing agent (nanobubble carbonated water) is injected directly into the drain line L1 when a chlorine-based disinfectant is used, and a weakly alkaline neutralizing agent is injected when an acid-based disinfectant is used, to neutralize the pH of the wastewater from a dialysis device or the like so that it does not deviate from a pH of 5-9. In this embodiment, because the wastewater flowing through the main drain pipe L3 via the drain line L1 is neutralized, no wastewater treatment tank is required, and no equipment is required to guide the wastewater to the wastewater treatment tank.

[0034] When instructed to add nanobubble carbonated water, i.e., when cleaning a dialysis machine, the neutralization unit 13 adds nanobubble carbonated water to a drain line L2 through which wastewater from the dialysis machine or the like is discharged, or to another drain line L1 different from the drain line L2, to neutralize the wastewater discharged from the dialysis machine or the like. In the example shown in Fig. 1, when instructed to add nanobubble carbonated water, the neutralization unit 13 adds nanobubble carbonated water to the drain line L1 to neutralize the wastewater discharged from the dialysis machine or the like into the drain lines L1 and L2 via the drain main pipe L3. Furthermore, when cleaning a dialysis machine or the like with a chlorine-based disinfectant, the neutralization unit 13 supplies water and carbon dioxide gas to the nanobubble device 4 to drive the nanobubble device 4.

[0035] The neutralization unit 13 neutralizes the wastewater by controlling the nanobubble device 4, the valves SV1-SV4, and the pumps P1 and P2. In this embodiment, the valves SV1-SV4 are solenoid valves that are controlled to ON or OFF by a control signal from the neutralization unit 13, stopping or allowing the fluid to flow. In this embodiment, when ON, the valves are opened to allow the fluid to flow, and when OFF, the valves are closed to stop the fluid.

[0036] Specifically, the neutralization processing unit 13 controls the valve SV1 between the water supply unit 2 and the nanobubble device 4 to inject water into the nanobubble device 4, and controls the valve SV2 between the carbon dioxide gas supply unit 3 and the nanobubble device 4 to inject carbon dioxide gas into the nanobubble device 4, thereby driving the nanobubble device 4 and causing the nanobubble device 4 to produce nanobubble carbonated water.The neutralization processing unit 13 then controls the valve SV3 between the nanobubble device 4 and the drain line L1 to pour the produced nanobubble carbonated water into the drain line L1.

[0037] The nanobubble device 4 uses water and carbon dioxide gas to create nanobubbled carbonated water. In other words, the nanobubble device 4 is a device that generates nanobubbles. The nanobubble device 4 can create nanobubble carbonated water using various methods, such as the cavitation method, ejector method, static mixer method, ultrafine pore method, and pressurized dissolution method. Nanobubbles are bubbles (spherical bubbles) of 200 nm or less. Nanobubbles are bubbles (carbon dioxide) that exist stably in water for a long period of time.

[0038] The nanobubble carbonated water produced by the nanobubble device 4 is discharged into the drain line L1 by the neutralization unit 13 controlling the pump P1. That is, the pump P1 operates when the nanobubble carbonated water is introduced into the drain line L1, and adjusts the flow rate. The neutralization unit 13 controls the pump P1 by sending an ON signal to the pump P1 to instruct it to operate or an OFF signal to instruct it to stop.

[0039] In this embodiment, nanobubble carbonated water in which bubbles remain stable for a long period of time is used as the neutralizing agent. As a result, even if the wastewater from the dialysate supply device 6 in the dialysis machine room and the wastewater from the dialysis device 7 are discharged through different drainage lines L1 and L2, the nanobubble carbonated water discharged from the nanobubble device 4 is discharged through the same main drainage pipe L3 to the drainage tank 8 in the basement of the building, and neutralization is completed within the main drainage pipe L3 or the drainage tank.

[0040] The amount of carbon dioxide gas dissolved in nanobubble carbonated water depends on the pressure of the injected carbon dioxide gas. Therefore, the pressure of the carbon dioxide gas supply unit 3 may be adjusted depending on the size of the medical institution where this system is installed (the number of dialysis machines), etc. To adjust the carbon dioxide gas pressure, for example, a regulator attached to the carbon dioxide gas cylinder (carbon dioxide gas supply unit 3) can be used.

[0041] A flow meter R1 may also be provided between the nanobubble device 4 and the drain line L1. The flow meter R1 measures the flow rate (total amount) of the nanobubble carbonated water introduced into the drain line L1 from the nanobubble device 4, and transmits the measured flow rate to the neutralization processing unit 13 of the control device 1. The neutralization processing unit 13 may use the received flow rate to control the pump P1 to adjust the flow rate of the nanobubble carbonated water introduced into the drain line L1.

[0042] The carbon dioxide gas supply unit 3 supplies carbon dioxide gas (CO2) to the nanobubble device 4. For example, a carbon dioxide gas cylinder or the like is used as the carbon dioxide gas supply unit 3. A flow meter R4 may be provided between the carbon dioxide gas supply unit 3 and the nanobubble device 4. The flow meter R4 measures the flow rate (total amount) of carbon dioxide gas supplied from the carbon dioxide gas supply unit 3 to the nanobubble device 4, and transmits the measured flow rate to the neutralization processing unit 13 of the control device 1. The neutralization processing unit 13 may adjust the flow rate of carbon dioxide gas supplied to the nanobubble device 4 using the received flow rate.

[0043] The water supply unit 2 supplies water to the nanobubble device 4. The water supplied to the water supply unit 2 may be tap water, RO water (filtered water), or the like. RO water is water that has been purified using a reverse osmosis membrane after processing such as filtration and ion exchange of tap water. It is preferable to use RO water that is free of impurities. A flow meter R3 may be provided between the water supply unit 2 and the nanobubble device 4. The flow meter R3 measures the flow rate (total amount) of water supplied from the water supply unit 2 to the nanobubble device 4 and transmits the measured flow rate to the neutralization processing unit 13 of the control device 1. The neutralization processing unit 13 may adjust the flow rate of water supplied to the nanobubble device 4 using the received flow rate.

[0044] When instructed to add a weak alkaline neutralizing agent, the neutralization treatment unit 13 directly adds the neutralizing agent to the drain line L1 to neutralize the wastewater discharged into the drain lines L1 and L2 by the dialysis machine or the like via the drain main pipe L3. As the weak alkaline neutralizing agent, a sodium bicarbonate (NaHCO3) solution or a sodium sesquicarbonate (Na3H(CO3)2) solution can be used.

[0045] The neutralization unit 13 controls the valve SV4 and the pump P2 to inject a weakly alkaline neutralizing agent into the drainage line L1 to neutralize the wastewater. The valve SV4 is a solenoid valve similar to the valves SV1-3. Specifically, the neutralization unit 13 controls the valve SV4 between the solution storage unit 5 and the drainage line L1 to directly inject the weakly alkaline neutralizing agent into the drainage line L1.

[0046] The solution storage unit 5 stores a weakly alkaline neutralizing agent (sodium bicarbonate solution, sodium sesquicarbonate solution, etc.) that neutralizes wastewater containing acidic disinfectants such as acetic acid. In this embodiment, it is assumed that sodium bicarbonate solution is stored in the solution storage unit 5. The concentration, flow rate, etc. of the sodium bicarbonate solution stored in the solution storage unit 5 are adjusted in advance depending on the size (number of dialysis machines) of the medical institution where the system is installed and the drugs used.

[0047] The solution storage unit 5 is equipped with a pump P2 for adjusting the flow rate when the sodium bicarbonate solution in the solution storage unit 5 is introduced into the drainage line L1. The neutralization processing unit 13 controls the pump P2 by sending an ON signal to instruct it to operate or an OFF signal to instruct it to stop.

[0048] A flow meter R2 may also be provided between the solution storage unit 5 and the drain line L1. The flow meter R2 measures the flow rate (total amount, flow rate per unit time) of the sodium bicarbonate solution introduced from the solution storage unit 5 into the drain line L1, and transmits the measured flow rate to the neutralization processing unit 13 of the control device 1. The neutralization processing unit 13 may use the received flow rate to control the pump P2 to adjust the flow rate of the sodium bicarbonate solution introduced into the drain line L1.

[0049] The control device 1 may include a monitoring unit 14 that monitors the pH of the main drainage pipe L3 or the drainage tank 8. For example, a sensor (not shown) may be installed at the end of the main drainage pipe L3 on the drainage tank 8 side or in the drainage tank 8, and the monitoring unit 14 may receive the pH value transmitted from the sensor and monitor whether the wastewater discharged to the outside meets the standard (pH 5-9) under the Sewerage Act. Furthermore, if the pH value received from the sensor does not meet the standard, the monitoring unit 14 may output an alarm (warning) from an output device such as a display or speaker of the control device 1, or may transmit the alarm to another administrator terminal (not shown). The sensor measures the pH value of the wastewater in the main drainage pipe L3 or the drainage tank 8 in response to an instruction from the monitoring unit 14.

[0050] Furthermore, if the pH value received from the sensor does not meet the standard, the monitoring unit 14 may output (feed back) the pH value to the neutralization processing unit 13. When the neutralization processing unit 13 receives the pH value output from the monitoring unit 14, it may determine that neutralization is insufficient and control the pumps P1, P2, for example, to increase the flow rate per unit time of the nanobubbled carbonated water or sodium bicarbonate solution, thereby controlling the pH value of the wastewater to fall within the range of the standard value.

[0051] (Control device operation) FIG. 3 is a flowchart showing the neutralization process of the control device 1 of this embodiment.

[0052] The control device 1 refers to the cleaning schedule stored in the memory unit 15 and determines whether the current time is the start time (start timing of addition) of the neutralizing agent (S11). If it is not the start time of addition (S11: NO), the control device 1 returns to S11. If it is the start time of addition (S11: YES), the control device 1 refers to the cleaning schedule and determines whether the neutralizing agent to be added is nanobubble carbonated water (S12).

[0053] In the case of nanobubble carbonated water (S12: YES), the control device 1 drives the nanobubble device 4 to produce nanobubble carbonated water and feeds the nanobubble carbonated water into the drain line L1 (S13). The control device 1 feeds the nanobubble carbonated water into the drain line L1 for the feeding time set in the cleaning schedule. When the feeding time has elapsed, the control device 1 stops the nanobubble device 4 to stop feeding of the nanobubble carbonated water, and returns to S11. When cleaning of a dialysis machine or the like with sodium hypochlorite begins, the pH of the wastewater discharged from the dialysis machine or the like rises to nearly 11, but in this embodiment, this is neutralized by feeding nanobubble carbonated water.

[0054] The process of S13 is specifically as follows: The control device 1 controls the valves SV1 to SV3, the pump P1, and the flow meter R1 to start the process of producing nanobubble carbonated water. The control device 1 opens the valve SV1 to inject water from the water supply unit 2 into the nanobubble device 4. The control device 1 opens the valve SV2 to inject carbon dioxide gas from the carbon dioxide gas supply unit 3 into the nanobubble device 4 into which water has been injected, and drives the nanobubble device 4 to produce nanobubble carbonated water. The control device 1 opens the valve SV3 and operates the pump P1 to introduce the nanobubble carbonated water into the drain line L1.

[0055] The flow meter R1 may measure the flow rate of the nanobubble carbonated water discharged from the nanobubble device 4 at a predetermined timing and transmit the measurement result to the control device 1. If the received flow rate deviates from a target flow rate, the control device 1 may change the rotation amount of the pump P1 and control the flow rate to the target flow rate.

[0056] If the neutralizing agent is not nanobubble carbonated water (S12: NO), the control device 1 introduces a weak alkaline neutralizing agent (such as a sodium bicarbonate solution) stored in the solution storage unit 5 into the drain line L1 (S14). The control device 1 introduces the weak alkaline neutralizing agent into the drain line L1 for the introduction time set in the cleaning schedule. When the introduction time has elapsed, the control device 1 stops introducing the weak alkaline neutralizing agent and returns to S11. When cleaning of the dialysis device or the like with acetic acid begins, the pH of the wastewater discharged from the dialysis device or the like drops to 2 to 3, but in this embodiment, this is neutralized by introducing the weak alkaline neutralizing agent.

[0057] Specifically, the process of S14 is as follows: The control device 1 opens the valve SV4 and operates the pump P2 to introduce the weak alkali neutralizing agent into the drain line L1. The flow meter R2 may measure the flow rate of the weak alkali neutralizing agent being discharged from the solution storage unit 5 at a predetermined timing and transmit the measurement result to the control device 1. If the received flow rate deviates from the target flow rate, the control device 1 may change the rotation rate of the pump P2 to control the flow rate to the target flow rate.

[0058] (Effects of this embodiment) The dialysis wastewater neutralization system of this embodiment described above includes the nanobubble device 4 that generates nanobubble carbonated water by nanobubbling water using water and carbon dioxide gas, and the control device 1 that neutralizes the wastewater discharged from the dialysis device 7 by introducing the nanobubble carbonated water into the drainage line L2 that discharges wastewater from the dialysis device 7 or into another drainage line L1 different from the drainage line L2 during cleaning of the dialysis device 7.

[0059] The dialysis wastewater neutralization method performed by the control device 1 of this embodiment supplies water and carbon dioxide gas to the nanobubble device 4 during cleaning of the dialysis device 7, drives the nanobubble device 4, and introduces the nanobubbled carbonated water produced by the nanobubble device 4 into the drainage line L2 that discharges wastewater from the dialysis device 7 or into another drainage line L1 different from the drainage line L2, thereby neutralizing the wastewater discharged from the dialysis device 7.

[0060] As described above, in this embodiment, nanobubble carbonated water is introduced into one of the drainage lines L1 and L2 to neutralize the wastewater in the drainage lines L1 and L2 so as to meet the standards of the Water Supply Act. Even when nanobubble carbonated water comes into contact with air, the carbon dioxide (air bubbles) do not escape into the air for a long period of time. Therefore, in this embodiment, even if the nanobubble device 4 (dialysis machine room) that produces the nanobubble carbonated water is located away from the dialysis machine, etc., and the nanobubble carbonated water flows through the drainage lines L1 and L2 and the main drainage pipe L3 in a state of coming into contact with air before reaching the wastewater from the dialysis machine, etc., a decrease in the neutralization effect can be prevented.

[0061] In this embodiment, nanobubble carbonated water is used as a neutralizer for alkaline wastewater. Nanobubble carbonated water has a much faster neutralization rate than carbon dioxide gas, so by adding nanobubble carbonated water to a drainage line, alkaline wastewater can be neutralized in a short period of time. In addition, carbonated water does not generate toxic gases and is easy and safe to handle.

[0062] Furthermore, according to this embodiment, there is no need to install a large water tank for treating wastewater, and no equipment is required to guide wastewater to the water tank. Therefore, the dialysis wastewater neutralization system of this embodiment can be made compact (apparatus) and can be installed in a small space. Therefore, even a small dialysis clinic located in a building as a tenant can easily install the dialysis wastewater neutralization system of this embodiment. Furthermore, the dialysis wastewater neutralization system of this embodiment can be installed without worrying about drainage pipes, even in dialysis facilities operated on the upper floors of a building.

[0063] Furthermore, in this embodiment, even if the dialysis facility expands in the future, there is no need to expand the dialysis wastewater neutralization system or secure new space; this can be accommodated simply by adjusting the amount of carbon dioxide gas input and the amount of water supplied by the carbon dioxide gas supply unit 3, making it highly scalable.

[0064] Furthermore, in the dialysis wastewater neutralization system of this embodiment, components such as the control device 1, water supply unit 2, carbon dioxide gas supply unit 3, nanobubble device 4, and solution storage unit 5 can be arranged separately rather than integrated, so each component can be installed as long as there is space available for it to be installed separately.

[0065] Furthermore, since this embodiment is a compact facility that directly injects carbonated water into the drain line, no large-scale facility construction is required and installation can be performed at low cost. Therefore, this embodiment has excellent cost performance.

[0066] (Hardware configuration) The control device 1 described above may be, for example, a general-purpose computer system including a CPU (Central Processing Unit, processor), memory, storage (HDD: Hard Disk Drive, SSD: Solid State Drive), a communication device, an input device, and an output device. The memory and storage are storage devices. In this computer system, the CPU executes a predetermined program loaded into the memory, thereby realizing each function of the control device 1. The control device 1 may be implemented in one computer or in multiple computers. The control device 1 may also be a virtual machine implemented in a computer. The control device 1 may also be a single-board computer (ultra-small computer) such as a Raspberry Pi.

[0067] The program for the control device 1 can be stored on a computer-readable recording medium such as an HDD, SSD, USB (Universal Serial Bus) memory, CD (Compact Disc), or DVD (Digital Versatile Disc), or can be distributed via a network.

[0068] The present invention is not limited to the above-described embodiments and modifications, and various modifications are possible within the scope of the present invention. For example, in the above-described embodiments, the drainage lines L1 and L2 are connected to one drainage main pipe L3. However, there may be multiple drainage main pipes L3. A drainage line for discharging wastewater from a dialysis device or the like may be connected to a first drainage main pipe, and a drainage line for introducing nanobubble carbonated water may be connected to a second drainage main pipe different from the first drainage main pipe. Even in such a case, if the first drainage main pipe and the second drainage main pipe are connected to the drainage tank 8, the wastewater discharged from the dialysis device or the like via the first drainage main pipe is neutralized in the drainage tank 8 by the nanobubble carbonated water supplied via the second drainage main pipe and then output to the outside. [Explanation of symbols]

[0069] 1: Control device 11: Input reception section 12: Start control unit 13: Neutralization processing section 14;Monitoring Department 15: Storage part 2:Water supply section 3: Carbon dioxide supply unit 4: Nanobubble device 5: Solution storage section 6: Dialysate supply device 7: Dialysis machine L1, L2: Drainage lines L3: Drainage main 8: Drain tank

Claims

1. A nanobubble device for producing nanobubbled carbonated water using water and carbon dioxide gas; and a control device that, when cleaning the dialysis device, introduces the nanobubble carbonated water into a drainage line through which wastewater from the dialysis device is discharged or into another drainage line different from the drainage line to neutralize the wastewater discharged from the dialysis device. Dialysis wastewater neutralization system.

2. The control device injects the nanobubble carbonated water into the other drainage line, the drain line and the other drain line are connected to a drain main; The wastewater and the nanobubble carbonated water are discharged to the outside through the main drainage pipe. The dialysis wastewater neutralization system of claim 1.

3. The control device supplies the water and the carbon dioxide gas to the nanobubble device and drives the nanobubble device when cleaning the dialysis device with a chlorine-based disinfectant. The dialysis wastewater neutralization system of claim 1.

4. A dialysis wastewater neutralization method performed by a control device, When cleaning the dialysis device, water and carbon dioxide gas are supplied to the nanobubble device to drive the nanobubble device; The nanobubble carbonated water produced by the nanobubble device is introduced into a drainage line for discharging wastewater from the dialysis device or into another drainage line different from the drainage line, thereby neutralizing the wastewater discharged from the dialysis device. Dialysis wastewater neutralization method.

5. A dialysis wastewater neutralization program that causes a computer to function as a control device for the dialysis wastewater neutralization system according to any one of claims 1 to 3.

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