Flow Cell System

Abstract

The influence of pulsation caused by a liquid delivery means such as a pump is reduced, and the liquid flow path is kept filled with liquid even when the supply of liquid is stopped. [Solution] The device comprises a storage tank having an internal space for storing liquid, a liquid inlet portion for introducing liquid into the internal space, and a drain outlet for discharging liquid from the internal space, and a flow cell having a liquid inlet and outlet, and a liquid flow path provided in the area between the inlet and outlet, the flow cell being configured so that a sensor can be installed in the liquid flow path, the inlet of the flow cell being connected to the drain outlet of the storage tank, the outlet of the flow cell being positioned above the inlet of the flow cell and the drain outlet of the storage tank, and having a siphon prevention section at the outlet or downstream of the outlet.

Description

[Technical Field]

[0001] The present invention relates to a flow cell system. [Background technology]

[0002] A liquid purification system that purifies wastewater using microorganisms has been known as a type of liquid treatment system for treating liquids. For example, Patent Document 1 discloses a circulating flush toilet that is equipped with a mechanism for purifying wastewater discharged from a flush toilet and circulating the purified water back into the flush toilet bowl.

[0003] The circulating flush toilet of Patent Document 1 comprises a biological treatment tank that decomposes organic matter in wastewater and performs nitrification and denitrification treatments, a filtration tank that separates the biologically treated water from the biological treatment tank into solid and liquid, and a decolorization tank that decolorizes the filtered water from the solid-liquid separation in the filtration tank.The chromaticity of the treated water decolorized in the decolorization tank is measured using a colorimeter, and only treated water with a predetermined chromaticity or lower is reused as flush water for the flush toilet.

[0004] Conventionally, a flow cell has been used to install such a sensor such as a colorimeter on a flow path. For example, Patent Document 2 discloses a flow cell in which a light introducing member for guiding light from a light source into a liquid flow path extending in the horizontal direction is attached to one end of the liquid flow path, and a light guiding member for guiding light transmitted through the liquid flowing in the liquid flow path to a detector is attached to the other end of the liquid flow path.

[0005] The flow cell of Patent Document 2 has a liquid inlet channel extending diagonally upward from one end of the liquid flow path, and a liquid outlet channel extending diagonally downward from the other end of the liquid flow path, and is configured so that the sample liquid flows from the liquid inlet channel into the liquid flow path, flows through the liquid flow path, and then flows out of the cell from the liquid outlet channel. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-132037 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-55784 Summary of the Invention [Problem to be solved by the invention]

[0007] However, since the circulating flush toilet of Patent Document 1 circulates liquid using a pump, if the liquid pressurized by the pump is allowed to flow directly into the flow cell of Patent Document 2, pulsation will occur in the liquid flowing through the flow cell, which could result in unstable measurements by the sensor.

[0008] Furthermore, the flow cell of Patent Document 2 has the problem that when the supply of sample liquid is stopped, all of the sample liquid in the liquid inlet, liquid flow path, and liquid outlet path flows out, causing a large amount of gas to flow into the flow cell. Such an inflow of gas may cause deterioration of the light source, detector, etc., arranged inside the flow cell, and may also cause bubbles in the liquid inlet path, which may result in measurement errors.

[0009] The present invention relates to a flow cell system that can reduce the effects of pulsation caused by a liquid delivery means such as a pump, and can maintain a state in which the liquid flow path is filled with liquid even when the supply of liquid is stopped. [Means for solving the problem]

[0010] A flow cell system according to one embodiment of the present invention comprises a storage tank having an internal space for storing liquid, a liquid introduction portion for introducing liquid into the internal space, and a drain outlet for discharging liquid from the internal space; and a flow cell having a liquid inlet and outlet, and a liquid flow path provided in the region between the inlet and the outlet, wherein the flow cell is configured to allow a sensor to be installed in the liquid flow path, the inlet of the flow cell is connected to the drain outlet of the storage tank, the outlet of the flow cell is positioned higher than the inlet of the flow cell and the drain outlet of the storage tank, and has a siphon prevention portion at the outlet or downstream of the outlet.

[0011] In the flow cell system according to one embodiment of the present invention, the inlet of the liquid introduction section may be located lower than the outlet of the flow cell.

[0012] In a flow cell system according to one embodiment of the present invention, the inlet of the liquid introduction section may be located on the outer periphery side of the radial center of the internal space and may open in the circumferential direction of the internal space.

[0013] In a flow cell system according to one embodiment of the present invention, the drain outlet of the storage tank may be formed on the bottom surface of the storage tank and may open in a direction opposite to the circumferential direction in which the inlet of the liquid introduction part opens.

[0014] In a flow cell system according to one embodiment of the present invention, the storage tank may be provided with an overflow section for discharging excess liquid from the internal space, and may be configured so that the flow rate of liquid flowing in from the inlet of the liquid introduction section is greater than the flow rate of liquid flowing out from the outlet of the flow cell.

[0015] In a flow cell system according to one embodiment of the present invention, the flow cell may be provided with an emitter capable of irradiating light onto the liquid flowing through the liquid flow path, and a light-receiving unit that receives the light emitted from the emitter, or may be provided with a liquid residual chlorine concentration meter that can measure the residual chlorine concentration of the liquid flowing through the liquid flow path. [Effects of the Invention]

[0016] The flow cell system of the present invention reduces the effects of pulsation caused by a liquid delivery means such as a pump, and makes it possible to maintain the liquid flow path filled with liquid even when the supply of liquid is stopped. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic configuration diagram showing a flow cell system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along the line AA′ in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Preferred embodiments 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. Furthermore, in the present embodiments, the scale and dimensions of each component may be exaggerated, and some components may be omitted.

[0019] [Overall configuration of the flow cell system] 1, the flow cell system 1 according to this embodiment includes a storage tank 10 for storing a liquid and a flow cell 20 configured to accommodate sensors S1 and S2. The liquid stored in the storage tank 10 is a liquid to be measured whose physical properties are measured by the sensors S1 and S2, and examples thereof include, but are not limited to, treated water obtained by purifying various raw waters such as domestic wastewater, sewage, rainwater, surface water, and groundwater discharged from consumers, and converted into domestic water that can be used for flushing toilets, baths, showers, laundry, washing dishes, etc., or potable water.

[0020] [Storage tank configuration] The storage tank 10 has a bottom surface 10a, a cylindrical peripheral wall 10b extending upward from the periphery of the bottom surface 10a, and a top surface 10c closing the upper end of the peripheral wall 10b. The bottom surface 10a, the peripheral wall 10b, and the top surface 10c define an internal space for storing liquid. In this embodiment, the peripheral wall 10b is formed in a cylindrical shape (circular cross section), but this is not limited thereto and various cross-sectional shapes can be adopted. In addition, in this embodiment, the bottom surface 10a and the top surface 20c are separate members that can be attached to and detached from the peripheral wall 10b, but this is not limited thereto.

[0021] The storage tank 10 has a liquid introduction part 12 that introduces liquid into the internal space and a drain outlet 14 that discharges the liquid from the internal space. The liquid introduction part 12 is connected directly or indirectly to a liquid supply mechanism (not shown) that supplies liquid toward the storage tank 10, and the drain outlet 14 is connected to an inlet 20a (described later) of the flow cell 20 via a pipe 30. The drain outlet 14 may also be connected directly to the inlet 20a of the flow cell 20 without the pipe 30.

[0022] The liquid introduction part 12 may be, for example, a pipe member that penetrates the top surface 10c and extends into the internal space. The liquid introduction part 12 is provided so as to be inclined with respect to the vertical direction of the storage tank 10 (the direction from the top surface 10c to the bottom surface 10a), and an introduction port 12a that releases the liquid into the internal space of the storage tank 10 is formed at its lower end. The introduction port 12a is located below an outlet port 20b of the flow cell 20, which will be described later.

[0023] The inlet 12a is located on the outer periphery side of the radial center C of the internal space. The inlet 12a is formed by cutting the lower end of the tubular liquid introduction part 12 obliquely with respect to the axial direction of the liquid introduction part 12, so that the inlet 12a opens obliquely with respect to the axial direction of the liquid introduction part 12. As shown in FIG. 2, the inlet 12a also opens in the circumferential direction of the internal space. With this configuration, the storage tank 10 according to this embodiment is configured so that the liquid released into the internal space from the inlet 12a flows spirally along the circumferential wall part 10b.

[0024] The drain outlet 14 is formed in the bottom surface 10a of the storage tank 10. However, this is not limitative, and the drain outlet 14 may be formed in a location other than the bottom surface 10a of the storage tank 10.

[0025] As shown in FIG. 2 , the drain outlet 14 is configured to discharge liquid in a direction opposite to the circumferential direction in which the inlet 12 a of the liquid introduction unit 12 opens. That is, in the state shown in FIG. 2 , the inlet 12 a of the liquid introduction unit 12 opens in a clockwise direction, thereby generating a clockwise flow of liquid in the internal space of the storage tank 10. In contrast, the drain outlet 14 is configured to discharge liquid via the piping 30 in a direction opposite to the clockwise flow of the liquid, i.e., toward the bottom of the page in FIG. 2 , rather than toward the top of the page in FIG. 2 along the clockwise flow of the liquid. With this configuration, even if a short-circuit flow occurs, in which the liquid flows in a short-circuit manner from the inlet 12 a of the liquid introduction unit 12 to the drain outlet 14, air bubbles in the short-circuit flow are separated by resistance force, centrifugal force, and the like when the liquid tries to flow toward the drain outlet 14 against the flow, so that even a small amount of air bubbles due to the short-circuit flow can be prevented from entering the flow cell 20.

[0026] The flow cell system 1 according to this embodiment is configured so that the flow rate of the liquid flowing in from the inlet 12a of the liquid introducing section 12 is greater than the flow rate of the liquid flowing out from the outlet 20b of the flow cell 20. In this embodiment, the inlet 12a of the liquid introducing section 12 has an opening area larger than the outlet 20b of the flow cell 20.

[0027] The storage tank 10 includes an overflow section 16 that drains excess liquid from the internal space. In this embodiment, the overflow section 16 is located above an outlet 20b (described later) of the flow cell 20, and is located on the top surface 10c of the storage tank 10. The diameter of the overflow section 16 is larger than the diameter of the drain outlet 14 of the storage tank 10. The overflow section 16 is configured to be directly or indirectly connectable to, for example, a treated water storage tank that stores liquid such as treated water. With this configuration, the storage tank 10 according to this embodiment can transfer a portion of the liquid supplied to the storage tank 10 to the flow cell 20 for measurement, and transfer the remainder directly to a treated water storage tank or the like via the overflow section 16 without measurement. This allows highly accurate measurements to be performed in the flow cell 20 without reducing the amount of liquid supplied from the liquid supply mechanism, in other words, without limiting the liquid supply capacity of the liquid supply mechanism. Furthermore, in the storage tank 10 of this embodiment, the diameter of the overflow section 16 is larger than the diameter of the drain outlet 14 of the storage tank 10, and it is possible to stably discharge excess liquid from the internal space, so that the flow rate per hour flowing from the drain outlet 14 of the storage tank 10 to the flow cell 20 can be kept constant.

[0028] [Flow cell configuration] As shown in FIG. 1, the flow cell 20 has an inlet 20a through which the liquid before measurement flows in, an outlet 20b through which the liquid after measurement flows out, and a liquid flow path located in the region between the inlet 20a and the outlet 20b, which allows the liquid to flow from the inlet 20a toward the outlet 20b.

[0029] The liquid flow path includes a first sensor chamber 22 in which a first sensor S1 can be installed, and a second sensor chamber 24 in which a second sensor S2 can be installed. The configurations of the first sensor chamber 22 and the second sensor chamber 24 will be described below, but the configurations of the first sensor chamber 22 and the second sensor chamber 24 are not limited to the configurations described below. Furthermore, the liquid flow path can adopt various configurations as long as it is possible to cause liquid to flow from the inlet 20a to the outlet 20b. For example, the liquid flow path may be configured to include only one of the first sensor chamber 22 and the second sensor chamber 24, or may have a structure different from the first sensor chamber 22 and the second sensor chamber 24.

[0030] The first sensor chamber 22 has flow velocity control paths 23a and 23b that can keep the flow velocity of the flowing fluid constant. In this embodiment, the first sensor chamber 22 has a first flow velocity control path 23a and a second flow velocity control path 23b that has a shorter flow path length than the first flow velocity control path 23a. The first flow velocity control path 23a and the second flow velocity control path 23b are arranged in series along the flow direction of the liquid.

[0031] The first sensors S1 are sensors for measuring the water quality, such as the turbidity and chromaticity of the liquid, and are installed in the first flow rate control path 23a and the second flow rate control path 23b, respectively. Specifically, one of the first sensors S1 is provided at one end of the first flow rate control path 23a in the flow direction and includes a light-emitting unit capable of irradiating light toward the liquid flowing through the liquid flow path, and a light-receiving unit provided at the other end of the first flow rate control path 23a in the flow direction and receiving the light emitted from the light-emitting unit. The first sensor S1 is configured to measure the water quality, such as the turbidity and chromaticity of the liquid, based on the light quantity value (measured value) of the light emitted from the light-emitting unit, transmitted through the liquid flowing through the first flow rate control path 23a, and reaching the light-receiving unit. Similarly, the other first sensor S1 is configured to measure the water quality, such as the turbidity and chromaticity of the liquid flowing through the second flow rate control path 23b, using the light-emitting unit and light-receiving unit provided in the second flow rate control path 23b.

[0032] In this way, the first sensor chamber 22 has a first flow velocity control path 23a and a second flow velocity control path 23b with different optical path lengths, and a first sensor S1 can be placed in each of them. Therefore, by utilizing the difference in measurement values due to the difference in optical path length, it is possible to more accurately identify the water quality such as the turbidity and color of the liquid flowing through the liquid flow path, as well as slight differences and changes in low turbidity to low color.

[0033] The second sensor chamber 24 is provided downstream of the first sensor chamber 22 and has a space capable of accommodating the second sensor S2. The second sensor S2 may be, for example, a liquid residual chlorine concentration meter capable of measuring the residual chlorine concentration of the liquid flowing through the liquid flow path.

[0034] The first sensor S1 and the second sensor S2 are not limited to the above-mentioned sensors, and various sensors can be used. For example, the sensor installed in the flow cell 20 may be a sensor that senses at least one of the elements listed below. (1) Electrical conductivity (EC value), pH, oxidation-reduction potential, alkalinity, ion concentration, hardness (2) Turbidity, color, opacity, viscosity, dissolved oxygen (3) Odor, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, total nitrogen, residual chlorine, total phosphorus, total organic carbon, total inorganic carbon, total trihalomethanes (4) Detection results of microbial sensors, chemical oxygen demand, biological oxygen demand, (5) Cyanide, mercury, oil, surfactants (6) Detection results of optical sensors and TDS (Total Dissolved Solids) sensors (7) Mass spectrometry results, fine particles, zeta potential, surface potential (8) Sound

[0035] As described above, the flow cell system 1 of this embodiment can be used with any variety of sensors, but as will be described later, it is capable of exhibiting extremely high degassing performance in the storage tank 10, and therefore can be used particularly effectively for sensors that are easily affected by bubbles, or sensors for measuring objects where accuracy is important, such as when measuring trace amounts of the object.

[0036] The inlet 20a of the flow cell 20 is formed in a part of the wall defining the first sensor chamber 22 and is connected to the drain outlet 14 of the storage tank 10 via piping 30 or directly without via piping 30.

[0037] The outlet 20b of the flow cell 20 is formed in a part of the wall that defines the second sensor chamber 24, and is located above the inlet 20a of the flow cell 20 and the outlet 14 of the storage tank 10.

[0038] The flow cell 20 also has an anti-siphon unit 40 at the outlet 20b or downstream of the outlet 20b to prevent the liquid in the flow cell 20 from continuously flowing out due to the siphon principle. In this embodiment, the anti-siphon unit 40 has an air vent hole 42 that is open to the atmosphere, and is configured to prevent the siphon effect from occurring due to the air vent. Note that the anti-siphon unit 40 is not limited to this, and various siphon killers, siphon breakers, etc. can be used.

[0039] [Advantages of the flow cell system according to this embodiment] The flow cell system 1 of this embodiment comprises a storage tank 10 having an internal space for storing liquid, a liquid introduction section 12 for introducing liquid into the internal space, and a drain outlet 14 for discharging liquid from the internal space, and a flow cell 20 having a liquid inlet 20a and outlet 20b, and a liquid flow path (first sensor chamber 22, second sensor chamber 24) provided in the area between the inlet 20a and the outlet 20b, the flow cell 20 being configured so that sensors S1 and S2 can be installed in the liquid flow path, the inlet 20a of the flow cell 20 being connected to the drain outlet 14 of the storage tank 10, the outlet 20b of the flow cell 20 being positioned above the inlet 20a of the flow cell 20 and the drain outlet 14 of the storage tank 10, and having a siphon prevention section 40 at or downstream of the outlet 20b.

[0040] With this configuration, even when liquid is supplied from a liquid supply mechanism using a pump or the like, the flow cell system 1 according to this embodiment temporarily stores the liquid in the storage tank 10 before flowing into the flow cell 20, allowing the liquid to flow into the flow cell 20 without pulsation, thereby reducing the effects of pulsation caused by a liquid delivery mechanism such as a pump. Furthermore, even when the supply of liquid from the liquid supply mechanism is stopped, the flow cell system 1 according to this embodiment maintains the water level in the storage tank 10 at the same level as the outlet 20b of the flow cell 20, as shown in FIG. 2 . This allows the liquid flow path of the flow cell 20 to remain filled with liquid, preventing the introduction of air bubbles and the like. Due to these advantages, the flow cell system 1 according to this embodiment can suppress measurement errors caused by pulsation of the pump or air bubbles, enabling measurements to be performed in a stable environment.

[0041] Furthermore, in the flow cell system 1 according to this embodiment, the inlet 12a of the liquid introduction section 12 is located below the outlet 20b of the flow cell 20. With this configuration, the flow cell system 1 according to this embodiment always introduces the liquid supplied from the inlet 12a of the liquid introduction section 12 into the liquid stored in the storage tank 10, so that even if the liquid supplied from the liquid supply mechanism contains gas, gas-liquid separation can be performed in the storage tank 10. Therefore, the flow cell system 1 having this configuration has the advantage of being able to further prevent gas from entering the flow cell 20.

[0042] Furthermore, in the flow cell system 1 according to this embodiment, the inlet 12a of the liquid introduction section 12 is located radially outward of the center C of the internal space and opens toward the circumferential direction of the internal space. With this configuration, the flow cell system 1 according to this embodiment generates a swirling flow within the storage tank 10 by the flow of liquid introduced into the storage tank 10, as shown in FIG. 2 . The centrifugal force of the swirling flow and the difference in specific gravity between the gas and the liquid can be used to more effectively degas the gas contained in the liquid. That is, the flow cell system 1 according to this embodiment generates a swirling flow within the storage tank 10, generating centrifugal force to concentrate gas with a low specific gravity toward the center C of the internal space and liquid with a high specific gravity toward the periphery of the internal space. This allows degassing of the liquid using the flow of the liquid without the need for a special degassing mechanism. Therefore, the flow cell system 1 according to this embodiment has the advantage of being able to further prevent gas from entering the flow cell 20.

[0043] Furthermore, in the flow cell system 1 according to this embodiment, the drain outlet 14 of the storage tank 10 is formed in the bottom surface 10a of the storage tank 10, and is configured to be able to discharge the liquid in a direction opposite to the circumferential direction in which the inlet 12a of the liquid introduction part 12 opens. By having such a configuration, the flow cell system 1 according to this embodiment has the advantage of being able to prevent even small air bubbles caused by short-circuit flow from being mixed into the flow cell 20.

[0044] Furthermore, in the flow cell system 1 according to this embodiment, the storage tank 10 is provided with an overflow section 16 that discharges excess liquid from the internal space, and the flow rate of the liquid flowing in from the inlet 12a of the liquid introduction section 12 is configured to be greater than the flow rate of the liquid flowing out from the outlet 20b of the flow cell 20. By providing such a configuration, the flow cell system 1 according to this embodiment has the advantage that the water level in the storage tank 10 is always located above the water level (outlet 20b) of the flow cell 20 while liquid is being supplied from the liquid supply mechanism, thereby further preventing gas from entering the flow cell 20. Furthermore, by providing the overflow section 16, the flow cell system 1 according to this embodiment has the advantage that, as described above, it is possible to perform highly accurate measurements in the flow cell 20 without reducing the amount of liquid supplied from the liquid supply mechanism (without limiting the liquid supply capacity of the liquid supply mechanism).

[0045] As described above, in the flow cell system 1 according to this embodiment, the storage tank 10 functions as a degassing device when the liquid to be measured flows into the flow cell 20, and also functions as a liquid supply device that utilizes the water level. The flow cell system 1 having both of the above configurations allows only the most degassed liquid to flow into the flow cell 20, and the flow cell 20 is always filled with the flowed-in liquid, which has the particularly significant advantage of enabling extremely accurate measurement of the physical properties of the liquid, even if the amount of the liquid to be measured is very small.

[0046] [Variations] The flow cell system according to the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical concept of the present invention.

[0047] In the above-described embodiment, the liquid introduction part 12 is described as a tubular member, but this is not limiting. For example, the liquid introduction part 12 may be an introduction port formed at any position in the storage tank 10.

[0048] In the above-described embodiment, the inlet 12a of the liquid introduction section 12 is described as being located below the outlet 20b of the flow cell 20, but this is not limited to this and the inlet 12a may be located at the same level as or above the outlet 20b of the flow cell 20.

[0049] In the above-described embodiment, the inlet 12a of the liquid introduction section 12 is described as being located on the outer periphery of the radial center C of the internal space and opening in the circumferential direction of the internal space, but this is not limited to this, and the inlet 12a may be located on the radial center C of the internal space, or may not be opening in the circumferential direction of the internal space.

[0050] In the above-described embodiment, the drain outlet 14 of the storage tank 10 is described as being formed in the bottom surface 10a of the storage tank 10 and opening in a direction opposite to the circumferential direction in which the inlet 12a of the liquid introduction part 12 opens, but this is not limited to this. For example, the drain outlet 14 of the storage tank 10 may be formed in a location other than the bottom surface 10a of the storage tank 10, and may not open in a direction opposite to the circumferential direction in which the inlet 12a of the liquid introduction part 12 opens.

[0051] In the above-described embodiment, the storage tank 10 is described as being provided with an overflow section 16 that drains excess liquid from the internal space, and configured so that the flow rate of liquid flowing in from the inlet 12a of the liquid introduction section 12 is greater than the flow rate of liquid flowing out from the outlet 20b of the flow cell 20. However, this is not limiting. For example, the storage tank 10 does not have to be provided with an overflow section 16 that drains excess liquid from the internal space. Furthermore, the flow cell system may be configured so that the flow rate of liquid flowing in from the inlet 12a of the liquid introduction section 12 is equal to or smaller than the flow rate of liquid flowing out from the outlet 20b of the flow cell 20.

[0052] It is clear from the claims that the above-mentioned modifications are included within the scope of the present invention. [Explanation of symbols]

[0053] 1: Flow cell system 10: Storage tank 10a: Bottom part 10b: Peripheral wall part 10c:Top section 12: Liquid introduction part 12a: Entrance 14:Drain port 16: Overflow section 20: Flow cell 20a: Inlet 20b: Outlet 20c: Top part 22: First sensor room 23a: First flow rate control path 23b: Second flow rate control path 24: Second sensor room 30: Piping 40: Siphon prevention part 42: Atmospheric vent hole S1: First sensor S2: Second sensor

Claims

1. a storage tank having an internal space for storing a liquid, a liquid introduction portion for introducing the liquid into the internal space, and a drain port for discharging the liquid from the internal space; a flow cell having an inlet and an outlet for a liquid, and a liquid flow path provided in a region between the inlet and the outlet; Equipped with the flow cell has a flow rate control path in the liquid flow path, the flow cell is configured so that a sensor can be installed in the flow rate control path; the inlet of the flow cell is connected to the outlet of the storage tank; the outlet of the flow cell is located above the inlet of the flow cell and the outlet of the storage tank; A siphon prevention part is provided at the outlet or downstream of the outlet. Flow cell system.

2. The inlet of the liquid introduction section is located below the outlet of the flow cell. The flow cell system of claim 1 .

3. The inlet of the liquid introduction portion is located on the outer circumferential side of the radial center of the internal space and is open in the circumferential direction of the internal space. The flow cell system of claim 2 .

4. The drain port of the storage tank is formed on the bottom surface of the storage tank and is configured to be able to discharge liquid in a direction opposite to the circumferential direction in which the inlet port of the liquid introduction portion opens. The flow cell system according to claim 3 .

5. The storage tank includes an overflow portion that discharges excess liquid from the internal space, The flow rate of the liquid flowing in from the inlet of the liquid introduction section is configured to be greater than the flow rate of the liquid flowing out from the outlet of the flow cell. The flow cell system according to any one of claims 1 to 4.

6. The flow cell includes a light-emitting unit capable of irradiating light toward the liquid flowing through the liquid flow path, and a light-receiving unit that receives the light emitted from the light-emitting unit. The flow cell system according to any one of claims 1 to 4.

7. The flow cell is provided with a liquid residual chlorine concentration meter capable of measuring the residual chlorine concentration of the liquid flowing through the liquid flow path. The flow cell system according to any one of claims 1 to 4.

8. The flow cell includes a first flow rate control path within the liquid flow path and a second flow rate control path having a flow path length longer than that of the first flow rate control path; The sensors are installed in the first flow rate control path and the second flow rate control path, respectively. The flow cell system according to any one of claims 1 to 4.

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