Storage system and manifold

Abstract

An object of the present invention is to provide a system that can measure the properties of a liquid contained in a liquid containing means, including the surroundings of the measuring means, with high accuracy, without having to include an agitating blade. [Solution] The above-mentioned object is achieved by a liquid storage system comprising a liquid containing means, a measuring means, and a branch pipe, wherein the liquid containing means is capable of containing a liquid, the branch pipe is a hollow structure including a main pipe section and two branch pipe sections branching off from the main pipe section, the branch pipes are arranged in the liquid containing means so that one of the branch pipe sections can supply gas from its end towards the main pipe section, and so that the other branch pipe section can supply the liquid contained in the liquid containing means towards the main pipe section from its end, and the measuring means is arranged so that it can measure the properties of the liquid using a detecting unit, and the detecting unit is located within the other branch pipe section.

Description

[Technical Field]

[0001] The present invention relates to a liquid storage system capable of measuring the properties of a liquid contained therein, and to a branch pipe that can be provided in the liquid storage system. [Background technology]

[0002] In order to measure the properties of a liquid, such as pH, turbidity, color, electrical conductivity, odor, and residual chlorine concentration, a sensor may be attached to a tank (vessel) capable of holding the liquid.

[0003] For example, when measuring the residual chlorine concentration of water, a measurement electrode is placed inside the tank. When measuring the residual chlorine concentration, immediately after applying a voltage between the electrodes, the chloride ion concentration in the water around the electrodes increases locally and temporarily. In contrast, the chloride ion concentration in the water away from the electrodes remains low. As a result, even if the water is in the same tank, the chloride ion concentration of the water around the electrodes may show different values ​​than the chloride ion concentration of the water outside the electrodes, resulting in an inaccurate measurement of the chloride ion concentration of the water in the tank. Furthermore, bubbles generated around the electrodes also make it difficult to accurately measure the chloride ion concentration of the water in the tank.

[0004] Furthermore, if the tank has a large capacity, substances with a high specific gravity, such as chlorine, tend to accumulate at the bottom of the tank, making the properties of the water in the tank uneven, which again creates the problem of not being able to accurately measure the chloride ion concentration of the water in the tank.

[0005] It is known that in order to make the properties of the water in a tank uniform, an agitator is provided in the tank to agitate and mix the water contained therein (see, for example, Patent Document 1). The device described in Patent Document 1 has electrodes and agitating blades in the tank. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-046423 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the device described in Patent Document 1, if the capacity or major axis of the tank is small, it is difficult to install both of these types of equipment at the same time due to spatial arrangement. Also, if the capacity of the tank is large, the arrangement of these two types of equipment does not resolve the unevenness of the water in the tank, and attempting to resolve this would require larger stirring blades, which would result in a problem of increased power supply.

[0008] Furthermore, there are few known systems to date that can accurately measure the properties of a liquid in a liquid storage means without having an agitating blade, by making the properties of the liquid stored in a liquid storage means such as a tank uniform, including around a measurement means such as an electrode that can measure the properties of the liquid, and / or by efficiently removing the adhesion of air bubbles that occur around the detection part of the measurement means.

[0009] Therefore, the problem that the present invention aims to solve is to provide a system that can accurately measure the properties of the liquid contained in the liquid containing means, including the area around the measuring means, without having to include an agitating blade. [Means for solving the problem]

[0010] The inventors of the present invention have conducted extensive research to solve the above problems, and have attempted to use air lift mixing instead of mixing using a stirring blade. With air lift mixing, gas is blown into the liquid from the bottom of the liquid containing means, and the buoyancy of the generated air bubbles is used to cause the liquid to flow, resulting in agitation of the liquid contained in the liquid containing means.

[0011] However, the inventors discovered a problem in that even when agitation by air lift is adopted, the properties of the liquid cannot be measured with high accuracy depending on the location of the detection unit of the measurement means. As a result of further trial and error, the inventors provided at least two branch pipes in the piping for sending gas to the liquid contained in the liquid containing means, and while gas is supplied from one branch pipe to the main pipe of the piping, liquid is taken in from the other branch pipe to the main pipe of the piping, and the detection unit of the measurement means is further disposed in the other branch pipe.

[0012] It was surprisingly discovered that in a liquid storage system having such a configuration of branch pipes and measuring means arranged at the bottom of the liquid containing means, when gas is supplied to the main pipe, the air lift has an effect of stirring the liquid, making the properties of the liquid contained in the liquid containing means uniform, and furthermore, by creating a negative pressure inside the branch pipe and causing the liquid to flow at a constant speed and contacting the detection unit, the properties of the liquid contained in the liquid containing means can be measured with high accuracy without causing any substances or gases generated to accumulate around the electrodes of the detection unit. Furthermore, by arranging the branch pipes and measuring means at the bottom of the liquid containing means, it has become possible to easily replace and maintain the measuring means from the outside.

[0013] Based on this idea, the inventors have finally succeeded in creating a system that can uniformly disperse the properties of the liquid contained in the liquid containing means and can measure the properties of the liquid with high precision, thereby solving the problems of the present invention. The present invention has been completed based on the idea and successful example first conceived by the inventors.

[0014] That is, according to each aspect of the present invention, the following embodiments are provided. [1] A liquid storage system, The device comprises a liquid containing means, a measuring means, and a branch pipe; The liquid containing means is capable of containing a liquid; The branch pipe is a hollow structure including a main pipe portion and two branch pipe portions branching from the main pipe portion, The branch pipe is disposed in the liquid containing means so that one of the branch pipe portions can supply gas from its end toward the main pipe portion, and the other of the branch pipe portions can supply the liquid contained in the liquid containing means from its end toward the main pipe portion; and the measuring means is capable of measuring the property of the liquid by the detecting portion, and is arranged so that the detecting portion is located in the other branch pipe portion; The reservoir system. [2] The liquid storage system according to item [1], wherein the branch pipe is fixed so that the other branch pipe portion is located at the bottom of the liquid storage means. [3] The liquid storage system according to item [1] or [2], wherein the measuring means is detachably attached to the other branch pipe portion of the branch pipe from the bottom of the liquid storage means. [Effects of the Invention]

[0015] According to the present invention, the properties of the liquid contained in the liquid containing means, including the surroundings of the measuring means, can be measured with high accuracy. The liquid storage system of one aspect of the present invention does not require a large-scale device such as an agitating blade, so it has a simple structure and can monitor the properties of the liquid with high accuracy.

[0016] One embodiment of the liquid storage system of the present invention can be installed downstream of equipment that handles processes such as biological treatment, chlorine addition, and sterilization by electrolysis, thereby monitoring residual chlorine and enabling highly efficient monitoring and feedback control of the upstream processes. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic diagram of a branch pipe disposed in a liquid containing means. [Figure 2A] FIG. 2A is a top view of reservoir system 10. FIG. [Figure 2B] FIG. 2B is a side view of reservoir system 10. [Figure 2C] FIG. 2C is a bottom view of reservoir system 10. [Figure 3A] FIG. 3A is a top view of reservoir system 100. FIG. [Figure 3B] FIG. 3B is a cross-sectional view of reservoir system 100 taken along line AA. [Figure 3C] FIG. 3C is a cross-sectional view of reservoir system 100 taken along the line BB. [Figure 4A] FIG. 4A is a top view of reservoir system 1000. FIG. [Figure 4B] FIG. 4B is a cross-sectional view of reservoir system 1000 taken along line AA. [Figure 4C] FIG. 4C is a cross-sectional view of the reservoir system 1000 taken along the line BB. [Figure 5] FIG. 5 is a cross-sectional view of the branch pipe 13 taken along line AA. [Figure 6] FIG. 6 is a layout diagram of the wastewater treatment system S. DETAILED DESCRIPTION OF THE INVENTION

[0018] Each aspect of the present invention will be described in detail below, but the present invention can take various forms as long as it achieves its object.

[0019] Unless otherwise specified, each term in this specification is used in the sense commonly used by those skilled in the art of water treatment and the like, and should not be construed as having an unduly limiting meaning. Furthermore, the speculations and theories made in this specification are based on the inventors' knowledge and experience to date, and therefore the present invention is not limited solely to such speculations and theories.

[0020] "Comprise," "contain," and "include" mean that elements other than those explicitly stated as included may be added (same meaning as "comprise at least"), but also encompass "consist of" and "essentially consist of." That is, "comprise" can mean including the explicitly stated elements and any one or more elements, consisting of the explicitly stated elements, or essentially consisting of the explicitly stated elements. "Have" is synonymous with "include." Elements include parts, means, ingredients, steps, conditions, parameters, and other limitations. "And / or" and its abbreviation " / " mean any one or any or all combinations of two or more of the associated listed items. Throughout this specification, the plural is intended to be included unless the singular is clearly indicated by the context.

[0021] One aspect of the present invention is a liquid storage system, which includes a liquid storage means, a measuring means, and a branch pipe.

[0022] A branch pipe is a hollow structure with a hollow interior through which gas and liquid can pass. A branch pipe includes a main pipe and branch pipes branching off from the main pipe. However, there may be two or more branch pipes. Below, a description is given of an embodiment in which the branch pipe has two branch pipes, but there may also be three or more branch pipes.

[0023] The main pipe of the branch pipe has an open end and is connected to two branch pipes at or near one end. One end of each branch pipe is connected to the main pipe of the branch pipe and the other end is open.

[0024] 1 is a schematic diagram showing the relationship between the main pipe and the branch pipe of a branch pipe arranged in a liquid containing means, with the up, down, left, and right directions of the drawing corresponding to the up, down, left, and right directions of the liquid containing means and the branch pipe, respectively.

[0025] In the branch pipe shown in Figure 1(A), one branch pipe is connected to the end of the main pipe in the direction of extension, and the other branch pipe is connected to the side of the main pipe in a direction perpendicular to the main pipe. In the branch pipe shown in Figure 1(B), one branch pipe is connected to the end of the main pipe in a direction perpendicular to the main pipe, and the other branch pipe is connected to the side of the main pipe in a direction perpendicular to the main pipe. In the branch pipe shown in Figure 1(C), one branch pipe is connected to the side of the main pipe in a direction perpendicular to the main pipe, and the other branch pipe is connected to the end of the main pipe in a direction perpendicular to the main pipe. In the branch pipe shown in Figure 1(D), one branch pipe is connected to the end of the main pipe in a direction perpendicular to the main pipe, and the other branch pipe is connected to the end of the main pipe in a direction perpendicular to the main pipe.

[0026] The measuring means can measure the properties of the liquid using the detecting unit. The detecting unit of the measuring means is arranged to be located in the other branch pipe portion of the branch pipe. With this arrangement, the measuring means can measure the properties of the liquid flowing in the other branch pipe portion of the branch pipe. It is preferable that the measuring means is detachable from the bottom of the liquid containing means to the other branch pipe portion of the branch pipe.

[0027] The liquid containing means is capable of containing a liquid. In the liquid containing means, it is preferable that the branch pipe is fixed so that the other branch pipe portion is located at the bottom of the liquid containing means.

[0028] By supplying gas from one branch pipe to the branch pipe, liquid is supplied from the other branch pipe to the main pipe, causing an air lift phenomenon and convection, which causes the liquid contained in the liquid containing means to flow and agitate. The gas supplied to the branch pipe from the upper end of the main pipe rises, creating a negative pressure inside the other branch pipe, causing the liquid to flow into the branch pipe from the open tip of the other branch pipe. This causes the liquid to flow out of the upper end of the main pipe together with the gas. This process is repeated, causing the liquid contained in the liquid containing means to continuously pass through the branch pipe, resulting in the liquid in the liquid containing means circulating. By measuring the liquid in this state with a measuring means whose detector is located inside the branch pipe, it becomes possible to measure the properties of the liquid with high accuracy, ensuring uniform concentration.

[0029] The branch pipe of Figure 1(C) is preferable because it allows the measuring means to be placed in the other branch pipe section to be inserted so that the bottom of the liquid containing means is connected to the measuring means, making it easy to replace and maintain the measuring means, and it also prevents the supplied gas from escaping from the other branch pipe section without passing through the main pipe section.

[0030] Branch pipes in the extension direction of the main pipe may be arranged in the same straight line (parallel) as the main pipe, or may be arranged bent in the extension direction of the main pipe. Branch pipes in a direction perpendicular to the main pipe may be arranged perpendicular to the main pipe, or may be arranged at a predetermined angle to the main pipe. However, the location where one branch pipe communicates with the main pipe is different from the location where the other branch pipe communicates with the main pipe.

[0031] In the branch pipes shown in Figures 1(B) and 1(C), each branch pipe is positioned perpendicular to the main pipe. The angle formed between one branch pipe and the other branch pipe with the main pipe as the central axis may be any angle, but is preferably about 180°.

[0032] The branch pipe can supply (receive) gas from outside the liquid containing means at one branch pipe section, and can supply (receive) liquid contained in the liquid containing means at the other branch pipe section. The main pipe section of the branch pipe can discharge upward the gas supplied at one branch pipe section and the liquid supplied at the other branch pipe section.

[0033] 1(A) to 1(D), the end of one of the branch pipes not on the main pipe side may be connected to the piping or gas supply means by communicating with the bottom or side of the liquid containing means, or the end may be bent above the liquid containing means and connected to the piping or gas supply means by communicating with the top (lid) of the liquid containing means.

[0034] Below, each aspect of the present invention and its embodiments will be described with reference to the drawings. In each drawing, parts that are less relevant to the present invention are omitted. In the drawings, a solid arrow (→) indicates the direction of gas flow, and a dotted arrow (- - →) indicates the direction of liquid flow. Note that the shapes of the liquid containing means, branch pipes, and measuring means may differ between drawings, but for convenience, the same numbers and symbols are used.

[0035] 2A to 2C are external views of a liquid storage system 10, which is an embodiment of a liquid storage system according to one aspect of the present invention, as viewed from the top, side, and bottom. The liquid storage system 10 comprises a liquid storage means 11, a measuring means 12, and a branch pipe 13. FIG. 2A is an external top view of the liquid storage system 10 as viewed from the side of the top surface 11a of the liquid storage means 11. FIG. 2B is an external side view of the liquid storage system 10 as viewed from the side of the side surface 11b of the liquid storage means 11. FIG. 2C is an external bottom view of the liquid storage system 10 as viewed from the side of the bottom surface 11c of the liquid storage means 11.

[0036] The liquid storage system 10 has a structure in which the upper surface 11a of the liquid storage means 11 is closed. The liquid storage means 11 is provided with an exhaust pipe 15 for discharging gas from the liquid storage means 11 and a liquid flow pipe 16 for sending liquid to the liquid storage means 11, so as to communicate with the upper surface 11a. However, in one embodiment of the liquid storage system of the present invention, the liquid storage means may have a structure in which part or all of the upper surface is open. In that case, the liquid storage means does not need to be provided with an exhaust pipe and / or a liquid flow pipe.

[0037] In liquid storage system 10, measurement means 12 is arranged so as to communicate with bottom surface 11c of liquid storage means 11. Bottom surface 11c of liquid storage means 11 may also be provided with drainage pipe 17 in communication therewith for draining liquid from liquid storage means 11. In Figures 2B and 2C, branch pipe 13 is arranged so as to communicate with bottom surface 11c of liquid storage means 11, but this is because the system is configured to supply gas from the bottom side of liquid storage means 11; if branch pipe 13 communicates with liquid storage means 11 via piping, branch pipe 13 may be fixed to the bottom near bottom surface 11c of liquid storage means 11.

[0038] The liquid containing means 11 may be any container-like structure capable of containing a liquid. The material of the liquid containing means 11 may be any material suitable for the liquid to be contained, and for example, when containing water such as wastewater, resins such as polyvinyl chloride and acrylic, metals such as stainless steel, etc. may be used.

[0039] The liquid contained in liquid containing means 11 may be any of water, organic solvents, inorganic solvents, and mixtures thereof. Examples of water include wastewater such as domestic wastewater discharged from drainage facilities such as washrooms, toilets, kitchens, bathrooms, and laundry rooms, urban wastewater, commercial wastewater, agricultural wastewater, and industrial wastewater, as well as sewage, rainwater, surface water, seawater, and tap water. The liquid contained in liquid containing means 11 may also be treated water that has been subjected to chemical treatment such as chlorination, biological treatment, physical treatment such as filtration, or electrolysis.

[0040] Fig. 3A is a top external view of a liquid storage system 100, which is another embodiment of the liquid storage system according to one aspect of the present invention. Fig. 3B is a cross-sectional view of the liquid storage system 100 taken along the AA plane shown in Fig. 3A. In Fig. 3B, a liquid W is contained in a liquid containing means 11. Fig. 3C is a cross-sectional view of the liquid storage system 100 taken along the BB plane shown in Fig. 3B. Although the liquid storage system 100 may be provided with a liquid inlet pipe and / or a liquid outlet pipe, these are not shown in these figures.

[0041] In Figure 3B, the top, bottom, left, and right of the drawing correspond to the top, bottom, left, and right of the liquid storage system. The left-right direction of the drawing is the horizontal direction (X-axis direction), the top and bottom direction of the drawing is the vertical direction (Y-axis direction), and the direction from the front to the back of the drawing is the depth direction (Z-axis direction). Of the lengths of the liquid storage means and the branch pipe, the vertical length is the height, the horizontal length is the width, and the depth length is the depth.

[0042] Liquid containing means 11 contains liquid W. One branch pipe section 13b of branch pipe 13 communicates with bottom surface section 11c of liquid containing means 11, receives gas from an opening section toward main pipe section 13a, and the gas passes through main pipe section 13a and is supplied to liquid containing means 11. The gas supplied to liquid containing means 11 becomes bubbles B and moves with buoyancy toward top surface section 11a of liquid containing means 11. At this time, convection C occurs in liquid W, and liquid W is stirred.

[0043] As the liquid W is stirred, it flows into the other branch pipe 13c through an opening thereof. One end of the other branch pipe 13c is connected to the main pipe 13a. The liquid W that has flowed into the other branch pipe 13c flows into the main pipe 13a and is discharged from the other opening of the main pipe 13a, located on the upper surface 11a side of the liquid containing means 11, together with the gas that has entered the main pipe 13a.

[0044] A detection unit 12a of measurement means 12 is disposed inside the other branch pipe 13c. This allows the properties of the liquid in the other branch pipe 13c to be measured by measurement means 12. A main body 12b of measurement means 12 is held by a measurement means holder 14 installed on the bottom surface 11c of liquid containing means 11. However, in a liquid storage system according to one embodiment of the present invention, if the detection unit is disposed so as to be located inside the branch pipe, the liquid containing means does not need to be provided with a measurement means holder.

[0045] The measuring means 12 is configured to be able to measure the properties of the liquid W. The properties of the liquid W measured by the measuring means 12 include, but are not limited to, the concentrations of substances such as chlorine, ozone, carbon dioxide, oxygen, nitrogen, ammonia, nitrous acid, nitric acid, and suspended matter in the mixed liquid, pH, conductivity, chromaticity, turbidity, temperature, and the amount of microorganisms.

[0046] The measuring means 12 may detect the absolute or relative amount of the object to be measured, or the amount of change therein, and convert the detected amount into an appropriate signal. Alternatively, the measuring means 12 may convert the electrical signal from the measuring means 12 into the absolute or relative amount of the object to be measured, or the rate of change or integral value thereof. The measuring means 12 is preferably a sensor that transmits the detected amount to an output means as an electrical signal. That is, the measuring means 12 may be a device having a detecting unit (detection probe) 12a such as an electrode. The measuring means 12 may also have a display unit that outputs the measurement results. Measurement of the properties of the liquid W by the measuring means 12 may be either continuous or intermittent.

[0047] When the measuring means 12 is a residual chlorine sensor, the storage system 100 can be provided downstream of the electrolysis tank, thereby making it possible to grasp the efficiency of electrolysis in the electrolysis tank based on the residual chlorine concentration. This allows for feedback control of the electrolysis tank, for example, by maintaining the electrolysis process or increasing the treatment intensity when the residual chlorine concentration is low, or by terminating the electrolysis process when the residual chlorine concentration is high.

[0048] In the liquid storage system 100, when gas is supplied to the liquid W from one branch pipe section 13b of the branch pipe 13 through the main pipe section 13a, negative pressure is created inside the other branch pipe section 13c of the branch pipe 13, causing convection C to occur and stir the liquid W, thereby reducing or suppressing errors due to the effects of uneven concentration when measuring the properties of the liquid W using the measurement means 12.

[0049] The branch pipe 13 may be any hollow structure that allows liquids and gases to pass through. The material of the branch pipe 13 may be selected depending on the liquids and gases to be passed through, and examples of the material include resins such as polyvinyl chloride and metals such as stainless steel when water and air are to be passed through.

[0050] Fig. 4A is a top external view of a liquid storage system 1000, which is another embodiment of the liquid storage system according to one aspect of the present invention, as viewed from the upper side. Fig. 4B is a cross-sectional view of the liquid storage system 1000 taken along the AA plane shown in Fig. 4A. In Fig. 4B, a liquid W is contained in a liquid containing means 11. Fig. 4C is a cross-sectional view of the liquid storage system 1000 taken along the BB plane shown in Fig. 4B. As in Fig. 3B, the top, bottom, left, and right of Fig. 4B correspond to the top, bottom, left, and right of the liquid storage system.

[0051] Liquid storage means 11 is provided with a liquid inflow pipe 16 communicating with bottom surface portion 11c for sending liquid W to liquid storage means 11, and a liquid drainage pipe 17 for draining liquid W from liquid storage means 11. The sending of liquid W to liquid storage means 11 through liquid inflow pipe 16 is performed by opening and closing valve 18a installed on liquid inflow pipe 16. Similarly, the drainage of liquid W from liquid storage means 11 through drainage pipe 17 is performed by opening and closing valve 18b. In FIG. 4B, both valves 18a and 18b are in a closed state.

[0052] In the liquid storage system 1000, one opening portion of one branch pipe portion 13b of the branch pipe 13 is bent and communicates with the upper surface portion 11a of the liquid containing means 11. As a result, gas flows into the branch pipe 13 from the upper surface portion 11a side of the liquid containing means 11.

[0053] FIG. 5 shows only the branch pipe 13 included in the liquid storage system 1000 shown in FIG. 4B. In the branch pipe 13, one branch pipe section 13b comprises a short side section 13b1 and a long side section 13b2. As shown in the figure, the curved section extending from the main pipe section 13a via the short side section 13b1 to the long side section 13b2 is preferably substantially U-shaped. Therefore, the main pipe section 13a and one branch pipe section 13b preferably have a substantially J- or hook-like shape overall. The other branch pipe section 13c has a measurement means installation section 13c1 for exposing the detection section of the measurement means. The measurement means installation section 13c1 is preferably located away from the section where the other branch pipe section 13c and the main pipe section 13a communicate, and more preferably located near the center of the other branch pipe section 13c.

[0054] Another aspect of the present invention is a branch pipe. The branch pipe of one embodiment of the present invention is a hollow structure including a main pipe portion, one branch pipe portion having a generally J-shape with short and long sides, branching off from the main pipe portion at the short side, and another branch pipe portion branching off from the main pipe portion so as to be generally perpendicular to the main pipe portion and generally parallel to the short side of the one branch pipe. In the branch pipe of one embodiment of the present invention, the positional relationship between the short side of the one branch pipe portion and the other branch pipe portion is such that in the vertical direction, the other branch pipe portion is located above the short side of the one branch pipe portion, and in the horizontal direction, the other branch pipe portion is located such that the angle formed between the short side of the one branch pipe portion, the main pipe portion, and the other branch pipe portion is greater than 0° and less than 360°.

[0055] In one embodiment of the liquid storage system of the present invention, as long as the liquid contained in the liquid containing means is stirred by the air lift phenomenon when aeration is performed through the opening of one of the branch pipes, the shape, length, height, and depth of the liquid containing means, the position of the branch pipe in the liquid containing means, and the diameter and length of the main pipe of the branch pipe may be appropriately set. Furthermore, as long as the liquid storage system is configured so that negative pressure is generated inside the other branch pipe of the branch pipe when aeration is performed through the opening of one of the branch pipes, and further so that a detection unit of the measurement means can be installed or exposed, the diameter and length of the branch pipe may be appropriately set.

[0056] The liquid storage system of one embodiment of the present invention can be incorporated, for example, into a part of a wastewater treatment system. Fig. 6 is a layout diagram of a wastewater treatment system S into which the liquid storage system of one embodiment of the present invention can be incorporated. The wastewater treatment system S sends wastewater via a wastewater tank to a treatment tank (such as a chemical treatment tank or a biological treatment tank) for wastewater treatment. The primary treated water treated in the treatment tank then passes through a separation membrane and undergoes a chemical treatment tank using chlorine addition or ozone, an electrical treatment tank using electrolysis or electrodialysis, or physical treatment such as membrane separation using a reverse osmosis membrane or activated carbon adsorption, before being stored in a treated water tank and used as purified water.

[0057] The liquid storage system of one embodiment of the present invention can be incorporated, for example, as an intermediate tank or a treated water tank in a wastewater treatment system S. For example, the liquid storage system of one embodiment of the present invention as an intermediate tank can measure the residual chlorine concentration, and if the residual chlorine concentration is high, send electrolyzed water to the membrane separation means, and if the residual chlorine concentration is low, return electrolyzed water to the electrolysis treatment tank.

[0058] The wastewater treatment system S may be any system that treats wastewater flowing in from outside the system and then supplies the resulting treated water as purified water outside the system. The wastewater treatment system S may be a building wastewater treatment system installed in a residence, small commercial facility, factory plant, temporary facility, etc., or it may be a portable wastewater treatment system that is movable. Among wastewater treatment systems S, a device that is connected to the building's drainage system, treats the wastewater flowing in from the drainage system, and returns the resulting treated water to the drainage system as purified water is called a circulating wastewater treatment system, and if the building is a residence such as a house, it is called a circulating residential wastewater treatment system.

[0059] The present invention is not limited to any of the above-described embodiments, and can be embodied by modifying the components within the scope of the gist of the present invention. Furthermore, various inventions can be formed by appropriately combining multiple components disclosed in the above embodiments. For example, some of the components shown in the embodiments may be modified, such as by addition, deletion, or substitution. Furthermore, the components and forms of different embodiments may be appropriately combined. [Industrial Applicability]

[0060] The liquid storage system and branch pipe of one embodiment of the present invention can be used to make the properties of the liquid stored in the liquid storage means uniform and to measure the properties of the liquid with high accuracy.Furthermore, the liquid storage system and branch pipe of one embodiment of the present invention can be used, for example, by installing it in a chlorination or electrolysis process in a wastewater treatment system or in a subsequent stage thereof to monitor residual chlorine after sterilization or disinfection treatment, thereby appropriately maintaining and managing the sterilization or disinfection treatment of the liquid. [Explanation of symbols]

[0061] 10, 100, 1000 reservoir systems 11 Liquid containment means 11a Upper surface of liquid containing means 11b Side portion of liquid containing means 11c Bottom surface of liquid containing means 12 Measurement means 12a Detecting section of measuring means 12b Main body of measuring means 13 Branch pipe 13a Main pipe section of branch pipe 13b One branch pipe section of the branch pipe 13b1 Short side of the main pipe of the branch pipe 13b2 Long side of the main pipe of the branch pipe 13c The other branch pipe of the branch pipe 13c1 Measuring means installation location of the other branch pipe section of the branch pipe 14 Measuring means holder 15 exhaust pipe 16 Flow tube 17 Drainage tube 18a, 18b valves

Claims

1. 1. A liquid storage system comprising: The device comprises a liquid containing means, a measuring means, and a branch pipe; The liquid containing means is capable of containing a liquid; The branch pipe is a hollow structure including a main pipe portion and two branch pipe portions branching from the main pipe portion, The branch pipe is disposed in the liquid containing means so that one of the branch pipe portions can supply gas from its end toward the main pipe portion, and the other of the branch pipe portions can supply the liquid contained in the liquid containing means from its end toward the main pipe portion; and the measuring means is capable of measuring the property of the liquid by the detecting portion, and is arranged so that the detecting portion is located in the other branch pipe portion; The reservoir system.

2. 2. The liquid storage system according to claim 1, wherein the branch pipe is fixed so that the other branch pipe portion is located at the bottom of the liquid containing means.

3. 3. The liquid storage system according to claim 1, wherein the measuring means is detachably attached to the bottom of the liquid storage means and inserted into the other branch pipe of the branch pipe.

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