Biological tank management system, biological tank management method, and biological tank management program

Abstract

To provide a biological tank management system, biological tank management method, and biological tank management program, capable of preventing the death of organisms.SOLUTION: Provided is a biological tank management system including: a biological tank having an inlet and an outlet; an inflow water sensor that measures the physical properties of inflow water flowing into the biological tank; and a gas sensor that measures the concentration of a predetermined gas contained in a gas discharged from the biological tank. Based on a detection value from the inflow water sensor and a detection value from the gas sensor, determination is made as to whether the inflow water is harmful to organisms.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a biological tank management system, a biological tank management method, and a biological tank management program. [Background technology]

[0002] Conventionally, biological treatment that purifies water using microorganisms has been used in various fields. For example, a circulating flush toilet is known that has a flush toilet and a biological treatment tank that receives wastewater from the flush toilet, decomposes organic matter in the wastewater, and performs nitrification and denitrification treatment, and circulates the treated water to the flush toilet as flush water (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-132037 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in biological treatment systems such as conventional circulating flush toilets, if a liquid that is harmful to the microorganisms in the biological treatment tank, such as a bactericidal liquid, flows into the biological treatment tank, even a small amount can cause a large number of microorganisms to die, and if subsequent treatment is delayed, there is a risk that all of the microorganisms in the biological treatment tank will die.

[0005] Furthermore, if the microorganisms in the biological treatment tank die, it takes a significant amount of time to restore the biological treatment system to a usable state again, and there is a problem that the biological treatment system cannot be used until restoration is performed.

[0006] The present invention has been developed in consideration of such problems, and aims to provide a biological tank management system, a biological tank management method, and a biological tank management program that can prevent the death of organisms in a biological tank. [Means for solving the problem]

[0007] The biological tank management system of the present invention comprises a biological tank having an inlet and an outlet, an inflow water sensor that measures the physical properties of the inflow water flowing into the biological tank, and a gas sensor that measures the concentration of a specified gas contained in the gas discharged from the biological tank, and determines whether the inflow water is harmful to biological organisms based on the detection values ​​of the inflow water sensor and the gas sensor.

[0008] In the biological tank management system of the present invention, the inflow water sensor may be an EC sensor and the gas sensor may be a CO2 sensor, and may be configured to measure the total flow rate of the gas passing through the outlet.

[0009] The biological tank management system of the present invention may also include a change amount determination unit that determines whether the change in concentration of the gas contained in the gas is greater than or equal to a predetermined change amount based on the detection value of the gas sensor.

[0010] The biological tank management system of the present invention may be provided with an inflow water determination unit which determines whether or not the inflow water is likely to be harmful based on the detection value of the inflow water sensor, and may determine that the inflow water is harmful to living organisms when the inflow water determination unit determines that the inflow water is likely to be harmful and the change amount determination unit determines that the change amount in the concentration of the gas is greater than or equal to the predetermined change amount.

[0011] The biological tank management system of the present invention may be configured to issue an alarm and / or stop the introduction of the inflow water when it is determined that the inflow water is harmful to the organisms.

[0012] The biological tank management method of the present invention determines whether the inflow water is harmful to organisms based on the detection value of an inflow water sensor that measures the physical properties of the inflow water flowing into the biological tank and the detection value of a gas sensor that measures the concentration of a specified gas contained in the gas discharged from the biological tank.

[0013] The biological tank management program of the present invention causes a control device to determine whether the inflow water is harmful to organisms based on the detection value of an inflow water sensor that measures the physical properties of the inflow water flowing into the biological tank and the detection value of a gas sensor that measures the concentration of a specified gas contained in the gas discharged from the biological tank. Effect of the Invention

[0014] According to the present invention, it is possible to provide a biological tank management system, a biological tank management method, and a biological tank management program that can prevent the death of organisms in a biological tank. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic diagram showing a biological tank management system according to an embodiment of the present invention. [Diagram 2] A functional block diagram showing a biological tank management system according to the present embodiment. [Diagram 3] FIG. 1 is an exploded view showing a gas sensor according to an embodiment of the present invention; [Figure 4] FIG. 1 is a diagram showing an example of a change in gas concentration according to the embodiment; [Diagram 5] A flowchart showing an example of a biological tank management method according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The best mode for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. The drawings are schematic diagrams in which emphasis, omission, and ratio adjustments have been appropriately made to illustrate the present invention, and may differ from the actual shapes, positional relationships, and ratios.

[0017] [Configuration of the biological tank management system according to this embodiment] First, a biological tank management system 1 according to an embodiment of the present invention will be outlined. As shown in Fig. 1, the biological tank management system 1 according to this embodiment generally comprises a biological tank 10, an inflow water sensor 20, and a gas sensor 30. The biological tank management system 1 also comprises a control device 50 as shown in Fig. 2.

[0018] Hereinafter, in this embodiment, the biological tank 10 will be described as being a biological treatment tank for water treatment, but is not limited thereto. The biological tank 10 may be, for example, an aquarium, a fish preserve, a fermenter used in the production of fermented foods and fermented beverages, a biomass reaction tank, etc. In addition, in this embodiment, the living organisms will be described as microorganisms described later in the biological tank 10, but are not limited thereto and may be any of various living organisms depending on the type of the biological tank 10. For example, the living organisms may be plants, insects, livestock such as cows, pigs, and chickens, and aquatic animals such as fish and crustaceans (including ornamental fish).

[0019] 1, the biological bath 10 has an inlet 12 and an outlet 14. In this embodiment, the biological bath 10 is sealed, and is configured so that gas within the biological bath 10 is discharged only through the outlet 14. The biological bath 10 has a pipe (not shown) connected to the inlet 12, and an exhaust duct (not shown) connected to the outlet 14.

[0020] At least microorganisms capable of biologically treating the inflowing water are accommodated in the biological tank 10. The microorganisms in the biological tank 10 generate CO2 (carbon dioxide) when they decompose organic matter contained in the inflowing water.

[0021] The inflow water sensor 20 is configured to measure the physical properties of the inflow water flowing into the biological tank 10. In this embodiment, the inflow water includes not only liquids but also liquids mixed with slurries, powders, solids, etc. In this embodiment, the inflow water sensor 20 is an EC sensor. Moreover, the physical property of the inflow water measured by the inflow water sensor 20 is electrical conductivity (electrical conductivity).

[0022] In this embodiment, the inflow water sensor 20 measures the electrical conductivity of the inflow water flowing into the biological tank 10 through the piping, but is not limited to this. The inflow water sensor 20 may measure the electrical conductivity of the inflow water at the inlet 12.

[0023] 1, the gas sensor 30 is configured to measure the concentration of a predetermined gas contained in the gas discharged from the biological bath 10. In this embodiment, the gas sensor 30 is a CO2 sensor, and the predetermined gas is CO2.

[0024] Moreover, the gas sensor 30 is configured to measure the total flow rate of the gas passing through the outlet 14. Specifically, as shown in Fig. 3, the gas sensor 30 has a sensor body 32 and a case 34 in which the sensor body 32 is attached, and is attached between the exhaust ducts.

[0025] The case 34 has a housing section that houses the sensor main body 32, and a connection section that is configured to be able to communicate with the exhaust duct. The connection section has a cylindrical section with a diameter that allows communication with the exhaust duct, and a cross-shaped reinforcing section is formed inside the cylindrical section. By having the reinforcing section, the connection section can be prevented from being damaged when the exhaust duct and the connection section are fastened with a hose band, but the reinforcing section is not necessary.

[0026] The sensor body 32 is attached to the storage portion of the case 34 in such a manner that the longitudinal direction of the cylindrical portion of the connection part is perpendicular to the surface of the sensor body 32, and is configured so that the total flow rate of gas flowing into the case 34 from the exhaust duct hits the surface of the sensor body 32.

[0027] The gas sensor 30 may measure the concentration of CO2 at the outlet 14, without measuring the concentration of CO2 contained in the gas discharged from the biological tank 10 through the exhaust duct. In other words, the gas sensor 30 may be installed at the outlet 14, rather than in the exhaust duct.

[0028] 2, the control device 50 includes a control unit 60 and a storage unit 70. The control device 50 may also include an input unit and a display unit. In this embodiment, the control device 50 is, for example, a microcontroller, a single board computer, a personal computer (notebook PC, desktop PC), a tablet terminal, a smartphone, or the like.

[0029] The control unit 60 includes an inflow water determination unit 61, a change amount determination unit 63, and a harmfulness determination unit 65. The control unit 60 is also configured to be able to acquire the detection value of the inflow water sensor 20 and the detection value of the gas sensor 30.

[0030] The inflow water determination unit 61 is configured to be able to acquire the detection value (electrical conductivity in this embodiment) of the inflow water sensor 20. The inflow water determination unit 61 determines whether or not the inflow water is likely to be harmful based on the detection value of the inflow water sensor 20. Specifically, when the electrical conductivity is equal to or greater than a predetermined value, the inflow water determination unit 61 determines that the inflow water is likely to be harmful. More specifically, when the electrical conductivity of the inflow water is equal to or greater than 1000 μS / cm, the inflow water determination unit 61 preferably determines that the inflow water is likely to be harmful, and more preferably determines that the inflow water is very likely to be harmful, when the electrical conductivity of the inflow water is equal to or greater than 5000 μS / cm.

[0031] The change amount determination unit 63 is configured to be able to acquire the detection value (in this embodiment, the concentration of CO2) of the gas sensor 30. The change amount determination unit 63 determines whether or not the amount of change ΔC in the concentration of the gas contained in the gas is equal to or greater than a predetermined amount of change, based on the detection value of the gas sensor 30. Specifically, as shown in FIG. 4, the change amount determination unit 63 determines whether or not the amount of change ΔC in the concentration of the gas in a predetermined time Δt is equal to or greater than a predetermined amount of change.

[0032] The harmfulness determination unit 65 determines whether the inflow water is harmful to living organisms based on the detection value of the inflow water sensor 20 and the detection value of the gas sensor 30. Specifically, the harmfulness determination unit 65 determines that the inflow water is harmful to living organisms (in this embodiment, microorganisms in the biological tank 10) when the inflow water determination unit 61 determines that the inflow water is highly likely to be harmful and the change amount determination unit 63 determines that the change amount ΔC of the gas concentration is equal to or greater than a predetermined change amount. Furthermore, the harmfulness determination unit 65 is configured to issue a warning to a user, a manager of the biological tank management system 1, a maintenance company, etc. when it determines that the inflow water is harmful to living organisms. Furthermore, the harmfulness determination unit 65 may be configured to stop the introduction of the inflow water when it determines that the inflow water is harmful to living organisms.

[0033] Furthermore, the harmfulness determination unit 65 may determine whether the inflowing water is harmful to organisms based on other information in addition to the detection value of the inflowing water sensor 20 and the detection value of the gas sensor 30. Examples of other information include information input by the user and status information of the biological tank 10. Status information of the biological tank 10 includes, for example, image information monitoring the inside of the biological tank 10, temperature change information within the biological tank 10, deviation from the normal pattern of the gas sensor 30, and no change in the detection value (CO2 concentration) of the gas sensor 30.

[0034] In addition, when harmful inflow water flows into the biological tank 10, the gas concentration does not change immediately, but events occur in the following order: harmful inflow water flows into the biological tank 10 → mass death of organisms occurs in the biological tank 10 → gas concentration changes. Therefore, in order to detect a causal relationship between the detection value of the inflow water sensor 20 and the detection value of the gas sensor 30, it is preferable that the detection value of the inflow water sensor 20 and the detection value of the gas sensor 30 referred to in the harmfulness determination unit 65 are values ​​detected at different times. Specifically, it is preferable that the harmfulness determination unit 65 determines whether the inflow water is harmful to organisms (in this embodiment, microorganisms in the biological tank 10) using the detection value of the inflow water sensor 20 measured at a certain timing and the detection value of the gas sensor 30 measured a predetermined time (for example, 1 to 30 minutes) after that.

[0035] It is most preferable that the specified time be within 30 minutes, 10 minutes, or 5 minutes, but it is more preferable that the optimal specified time can be appropriately selected depending on the volume of the gas phase in the biological tank 10, the volume of the outlet 14, the volume from the outlet 14 to the gas sensor 30, and the amount of gas supplied.

[0036] For this reason, it is preferable that the harmfulness determination unit 65 determines that the inflowing water is harmful to living organisms when the amount of change in gas concentration ΔC is determined to be equal to or greater than a predetermined amount of change after the inflowing water determination unit 61 determines that the inflowing water is likely to be harmful. For example, it is preferable that the harmfulness determination unit 65 determines that the inflowing water is harmful to living organisms when the concentration of CO2 drops to or greater than a predetermined amount of change after a predetermined time (e.g., 1 to 30 minutes) has elapsed after the inflowing water determination unit 61 determines that the inflowing water is likely to be harmful.

[0037] Here, the "predetermined amount of change" is a threshold value for determining whether or not an abnormality has occurred in the biological tank 10, and in the case where the gas sensor 30 is a CO2 sensor, it is a threshold value for detecting a decrease in the CO2 concentration due to mass death of organisms (e.g., microorganisms) in the biological tank 10. The threshold value of the "predetermined amount of change" in the CO2 concentration is, for example, a decrease in the CO2 concentration of 100 ppm or more. For example, when the CO2 concentration decreases by 100 ppm or more per minute, the harmfulness determination unit 65 estimates that a sudden mass death of microorganisms in the biological tank 10 has occurred. Also, when the CO2 concentration continues to decrease for a long period of time, it estimates that an abnormality has occurred in the activity of the microorganisms.

[0038] The memory unit 70 is configured with a storage device, and stores a biological tank management program 71. The memory unit 70 may also store the detection values ​​of the inflow water sensor 20 and the detection values ​​of the gas sensor 30. The biological tank management program 71 causes the control device 50 to determine whether or not the inflow water is harmful to organisms, based on the detection values ​​of the inflow water sensor 20 and the detection values ​​of the gas sensor 30.

[0039] [Biotank management method according to this embodiment] Next, a biological tank management method using the biological tank management system 1 according to this embodiment will be described. In summary, the biological tank management method according to this embodiment determines whether or not the inflow water is harmful to organisms based on the detection value of the inflow water sensor 20 and the detection value of the gas sensor 30. Hereinafter, the biological tank management method according to this embodiment will be described in detail with reference to FIG. 5.

[0040] First, the inflow water sensor 20 measures the physical properties (electrical conductivity in this embodiment) of the inflow water when the inflow water flows into the biological tank 10 (S1 in FIG. 5: physical properties measurement step). Also, the inflow water determination unit 61 of the control unit 60 of the control device 50 acquires the detection value measured by the inflow water sensor 20 (S10 in FIG. 5: physical properties acquisition step).

[0041] Furthermore, the gas sensor 30 measures the concentration of a predetermined gas (CO in this embodiment) contained in the gas discharged from the biological tank 10 (S2 in FIG. 5: gas concentration measurement step). Then, the change amount determination unit 63 of the control unit 60 of the control device 50 acquires the detection value measured by the gas sensor 30 (S11 in FIG. 5: gas concentration acquisition step).

[0042] The measurement of the physical properties of the inflowing water by the inflowing water sensor 20 and the measurement of the concentration of a predetermined gas by the gas sensor 30 are each performed at a predetermined frequency.

[0043] Thereafter, the inflow water determination unit 61 determines whether or not the inflow water is likely to be harmful based on the acquired detection value of the inflow water sensor 20 (S12 in FIG. 5: Harmfulness determination step). In this embodiment, the change amount determination unit 63 determines that the inflow water is likely to be harmful when the electrical conductivity of the inflow water is equal to or higher than a predetermined value.

[0044] Further, the change amount determination unit 63 determines whether or not the change amount ΔC of the concentration of CO2 in a predetermined time Δt is equal to or greater than a predetermined change amount based on the obtained detection value of the gas sensor 30 (S13 in FIG. 5: change amount determination step).

[0045] Then, when the inflow water determination unit 61 determines that the inflow water is highly likely to be harmful (YES in S12 in FIG. 5) and the change amount determination unit 63 determines that the change amount ΔC in the CO2 concentration is equal to or greater than a predetermined change amount (YES in S13 in FIG. 5), the harmfulness determination unit 65 determines that the inflow water is harmful to organisms (S14 in FIG. 15) and issues a warning to the user, the manager of the biotask management system 1, the maintenance company, etc. Note that the change amount ΔC in the CO2 concentration referred to at this time is preferably calculated using the detection value of the gas sensor 30 measured a predetermined time (e.g., 1 to 30 minutes) after the inflow of the inflow water determined to be highly likely to be harmful.

[0046] On the other hand, if the inflow water determination unit 61 determines that the inflow water is not likely to be harmful (NO in S12 of Figure 5), or if the inflow water determination unit 61 determines that the inflow water is likely to be harmful (YES in S12 of Figure 5) and the change amount determination unit 63 determines that the change amount ΔC in the CO2 concentration is less than a predetermined change amount (NO in S13 of Figure 5), the harmfulness determination unit 65 determines that the inflow water is harmless to living organisms (S15 of Figure 15).

[0047] Through the above steps, a series of biological tank management methods are carried out by the biological tank management system 1 according to this embodiment.

[0048] [Advantages of the biological tank management system, biological tank management method, and biological tank management program according to the present embodiment] As described above, the biological tank management system 1 of this embodiment comprises a biological tank 10 having an inlet 12 and an outlet 14, an inflow water sensor 20 that measures the physical properties of the inflow water flowing into the biological tank 10, and a gas sensor 30 that measures the concentration of a specified gas contained in the gas discharged from the biological tank 10, and determines whether the inflow water is harmful to living organisms based on the detection values ​​of the inflow water sensor 20 and the gas sensor 30.

[0049] Furthermore, by being equipped with such a configuration, the biological tank management system 1 of this embodiment determines whether the inflowing water is harmful based on the physical properties of the inflowing water and the concentration of a specific gas contained in the gas discharged from the biological tank 10, and therefore has the advantage that if inflowing water that is harmful to living organisms flows into the biological tank 10, it is possible to determine that the inflowing water is harmful at an early stage and prevent the death of the organisms in the biological tank 10.

[0050] In addition, in the biological tank management system 1 according to this embodiment, the inflow water sensor 20 is an EC sensor, and the gas sensor 30 is a CO2 sensor, and they are configured to measure the total flow rate of gas passing through the outlet 14. This configuration has the advantage that accurate measurement can be performed without maintenance, thereby preventing the death of organisms in the biological tank 10 over a long period of time.

[0051] Furthermore, the biological tank management system 1 according to this embodiment includes a change amount determination unit 63 that determines whether the change amount ΔC in the concentration of the gas contained in the gas is equal to or greater than a predetermined change amount based on the detection value of the gas sensor 30. With this configuration, for example, a change in the activity state of the organisms in the biological tank 10 can be determined from a change in the concentration of CO2 emitted by the organisms, and therefore, when harmful inflow water flows in, it can be determined that the inflow water is harmful, which has the advantage of preventing the death of the organisms in the biological tank 10.

[0052] Furthermore, the biological tank management system 1 according to this embodiment includes an inflow water determination unit 61 that determines whether the inflow water is likely to be harmful based on the detection value of the inflow water sensor 20, and when the inflow water determination unit 61 determines that the inflow water is likely to be harmful and the change amount determination unit 63 determines that the change amount ΔC in the gas concentration is equal to or greater than a predetermined change amount, the inflow water is determined to be harmful to organisms. With this configuration, for example, if the determination is made only based on the change amount ΔC in the gas concentration when the biological tank 10 is a biological treatment tank, even if the inflow water is not likely to be harmful, if the inflow water does not contain much organic matter and is alkaline, the decomposition of the organic matter in the inflow water by the microorganisms in the biological tank 10 is not performed very much (there is little CO2 generation), and the dissolution rate of CO2 in the inflow water increases, so that the change amount ΔC in the concentration of CO2 discharged drops to a predetermined change amount or more, and the inflow water may be erroneously determined to be harmful. However, by determining whether the inflow water is likely to be harmful, erroneous determinations can be prevented, and the death of organisms in the biological tank 10 can be more accurately prevented.

[0053] Furthermore, the biotask management system 1 according to this embodiment is configured to issue a warning and / or stop the introduction of the inflow water when it is determined that the inflow water is harmful to living organisms. With this configuration, it is possible to take prompt measures even in the unlikely event that harmful inflow water enters the biotask 10, and this has the advantage of making it possible to more effectively prevent the death of living organisms in the biotask 10.

[0054] [Variations] Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above-mentioned embodiments. Various modifications and improvements can be made to the above-mentioned embodiments.

[0055] For example, in the above-mentioned embodiment, the inflow water sensor 20 is an EC sensor, the gas sensor 30 is a CO2 sensor, and the inflow water sensor 20 is configured to measure the total flow rate of the gas passing through the outlet 14, but the present invention is not limited thereto. The inflow water sensor 20 does not have to be an EC sensor. For example, the inflow water sensor 20 may be a pH sensor, a temperature sensor, a color sensor, a turbidity sensor, an ORP sensor, or the like. In addition to the physical properties of the inflow water, the inflow water sensor 20 may measure the inflow amount of the inflow water, as well as information that the user may refer to, such as user-relevant information, image information capturing the state inside the biological tank 10, and pattern data under normal conditions. In addition, the gas sensor 30 does not have to be a CO2 sensor. The gas sensor 30 may be a sensor that measures the concentration of, for example, N2, O2, H2, NH3, CO, O3, Cl2, CH4, H2S, odorous gas, volatile organic compounds, or the like. Furthermore, the gas sensor 30 does not have to measure the total flow rate of the gas passing through the outlet 14.

[0056] In the above embodiment, the biological tank management system 1 has been described as including a change amount determination unit 63 that determines whether the amount of change ΔC in the concentration of the gas contained in the gas is equal to or greater than a predetermined amount of change based on the detection value of the gas sensor 30. However, the present invention is not limited to this. The biological tank management system 1 does not have to include the change amount determination unit 63.

[0057] In the above-described embodiment, the biological tank management system 1 is described as including an inflow water determination unit 61 that determines whether or not the inflow water is likely to be harmful based on the detection value of the inflow water sensor 20, and determines that the inflow water is harmful to organisms when the inflow water determination unit 61 determines that the inflow water is likely to be harmful and the change amount determination unit 63 determines that the change amount ΔC in the gas concentration is equal to or greater than a predetermined change amount, but is not limited to this. The biological tank management system 1 does not have to include the inflow water determination unit 61.

[0058] In the above-described embodiment, the biotame management system 1 has been described as being configured to issue a warning and / or stop the introduction of the inflow water when it is determined that the inflow water is harmful to living organisms, but this is not limited thereto. The biotame management system 1 does not have to issue a warning when it is determined that the inflow water is harmful to living organisms. Furthermore, the biotame management system 1 does not have to stop the introduction of the inflow water when it is determined that the inflow water is harmful to living organisms. [Explanation of symbols]

[0059] 1. Biotask Management System 10 Biological tank 12 Inlet 14 Outlet 20 Inflow water sensor 30 Gas Sensor 32 Sensor body 34 cases 50 Control device 60 Control section 61 Inflow water determination section 63 Change amount determination unit 65 Harmful Judgment Department 70 Storage section 71 Biotask Management Program

Claims

1. A biological tank having an inlet and an outlet; an inflow sensor for measuring the physical properties of inflow water flowing into the biological tank; a gas sensor for measuring the concentration of a predetermined gas contained in the gas discharged from the biological tank; Equipped with Based on the detection value of the inflow water sensor and the detection value of the gas sensor, it is determined whether the inflow water is harmful to living organisms. Biotask management system.

2. the inflow water sensor is an EC sensor; The gas sensor is a ２ a sensor configured to measure a total flow rate of the gas passing through the outlet. The biological tank management system according to claim 1.

3. a change amount determination unit that determines whether or not a change amount in the concentration of the gas contained in the gas is equal to or greater than a predetermined change amount based on the detection value of the gas sensor; The biological tank management system according to claim 1 or 2.

4. an inflow water determination unit that determines whether or not the inflow water is likely to be harmful based on the detection value of the inflow water sensor; When the inflow water determination unit determines that the inflow water is highly likely to be harmful and the change amount determination unit determines that the change amount of the gas concentration is equal to or greater than the predetermined change amount, the inflow water is determined to be harmful to living organisms. The biological tank management system according to claim 3.

5. and configured to issue a warning and / or stop introduction of the influent when the influent is determined to be harmful to the organism. The biological tank management system according to claim 4.

6. Whether or not the inflow water is harmful to organisms is determined based on the detection value of an inflow water sensor that measures the physical properties of the inflow water flowing into the biological tank and the detection value of a gas sensor that measures the concentration of a predetermined gas contained in the gas discharged from the biological tank. Biological tank management method.

7. The control device determines whether the inflow water is harmful to organisms based on a detection value of an inflow water sensor that measures the physical properties of the inflow water flowing into the biological tank and a detection value of a gas sensor that measures the concentration of a predetermined gas contained in the gas discharged from the biological tank. Biotask management program.

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