Gas-liquid contact container and gas-liquid contact system

Abstract

The present invention includes: a cylindrical container body that extends along the vertical direction; a liquid introduction part for introducing a liquid into the container body; and a gas release part for releasing gas into the container body. The container body includes, at a midway section of the container body in the vertical direction, an outflow port for allowing the liquid to flow to the outside of the container body. The gas release part is configured to release the gas, below the outflow port.

Description

Gas-liquid contact vessel and gas-liquid contact system

[0001] The present invention relates to a gas-liquid contacting vessel and a gas-liquid contacting system.

[0002] Conventionally, there has been known a countercurrent gas-liquid contactor in which a liquid to be treated flowing in from the top of a gas-liquid contactor is brought into countercurrent contact with a gaseous body flowing in from the bottom of the gas-liquid contactor, thereby treating the liquid to be treated inside the gas-liquid contactor (see, for example, Patent Document 1). In the countercurrent gas-liquid contactor described in Patent Document 1, the liquid to be treated that has been treated by contact with the gaseous body is discharged from the bottom of the gas-liquid contactor, and the gaseous body remaining inside the gas-liquid contactor is discharged from the top of the gas-liquid contactor.

[0003] Japanese Unexamined Patent Publication No. 54-018468

[0004] In the countercurrent gas-liquid contactor described in Patent Document 1, the liquid to be treated and the gas body come into contact only between the inlet and outlet of the liquid to be treated in the gas-liquid contact tower, which causes a problem in that it is difficult to improve the treatment efficiency of the liquid to be treated.

[0005] The present invention relates to a gas-liquid contactor vessel and a gas-liquid contactor system that can improve the efficiency of treating a liquid.

[0006] The gas-liquid contact container of the present invention comprises a cylindrical container body extending in the vertical direction, a liquid introduction section for introducing liquid into the container body, and a gas release section for releasing gas into the container body, wherein the container body has an outlet in the middle of the vertical direction of the container body for discharging the liquid to the outside of the container body, and the gas release section is configured to release gas below the outlet.

[0007] In the gas-liquid contact container according to the present invention, the container body may have an exhaust part for discharging gas above the outlet.

[0008] In the gas-liquid contact container according to the present invention, the container body may have a large diameter portion and a small diameter portion having a diameter smaller than that of the large diameter portion, the small diameter portion being provided above the large diameter portion, and the outlet may be provided between the large diameter portion and the small diameter portion.

[0009] In the gas-liquid contact vessel according to the present invention, one or more outlets may be provided along the circumferential direction of the vessel body.

[0010] The gas-liquid contact system of the present invention comprises a gas-liquid contact vessel, a liquid supply mechanism that supplies liquid to the gas-liquid contact vessel, and a gas introduction mechanism that introduces gas into the gas-liquid contact vessel, wherein the gas-liquid contact vessel comprises a cylindrical vessel body extending in the vertical direction, a liquid introduction section that introduces liquid supplied from the liquid supply mechanism into the interior of the vessel body, and a gas release section that releases gas introduced from the gas introduction mechanism into the interior of the vessel body, wherein the vessel body has an outlet in the middle of the vertical direction of the vessel body for discharging the liquid to the outside of the vessel body, and the gas release section is configured to release gas below the outlet.

[0011] According to the gas-liquid contactor vessel and gas-liquid contactor system of the present invention, it is possible to improve the efficiency of treating a liquid.

[0012] Fig. 1 is a schematic cross-sectional view showing a gas-liquid contacting system according to the present embodiment; Fig. 2 is a schematic cross-sectional view showing a gas-liquid contactor vessel according to the present embodiment; Fig. 3 is a schematic view showing the flow of liquid treatment; Fig. 4 is a schematic cross-sectional view showing a gas-liquid contacting system according to a modified example;

[0013] 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.

[0014] [Overall Configuration of Gas-Liquid Contact System] The gas-liquid contact system according to this embodiment is a system for treating a liquid by bringing the gas and the liquid into contact with each other, in other words, a liquid treatment system. Specifically, as shown in Fig. 1, the gas-liquid contact system 1 includes a gas-liquid contactor 100 for bringing the gas and the liquid into contact with each other, a liquid supply mechanism 200 for supplying the liquid to the gas-liquid contactor 100, a gas introduction mechanism 300 for introducing the gas into the gas-liquid contactor 100, and a liquid storage mechanism 400 for storing the liquid flowing out of the gas-liquid contactor 100.

[0015] In this specification, the liquid to be treated in the liquid treatment space IS1 of the gas-liquid contact vessel 100, which will be described later, is referred to as the "untreated liquid," the liquid to be treated in the remaining gas treatment space IS2 of the gas-liquid contact vessel 100, which will be described later (i.e., the liquid that was not completely treated in the liquid treatment space IS1), is referred to as the "remaining untreated liquid," and the liquid after being treated in the liquid treatment space IS1 or the remaining gas treatment space IS2 of the gas-liquid contact vessel 100 is referred to as the "treated liquid." Note that in this specification, the untreated liquid, the remaining untreated liquid, and the treated liquid may also be referred to simply as the "liquid."

[0016] [Configuration of gas-liquid contact vessel] As shown in Figures 1 and 2, the gas-liquid contact vessel 100 comprises a cylindrical vessel body 110 extending along the vertical direction, a liquid introduction section 120 that introduces pre-treatment liquid into the vessel body 110, a gas release section 130 that releases gas into the vessel body 110, and a gas supply section 140 that supplies gas to the gas release section 130.

[0017] In this specification, "vertical" includes both completely vertical and approximately vertical. "Approximately vertical" means a slight inclination relative to the vertical, specifically, an inclination to the extent that the effect of the gas-liquid contactor 100 is not impaired.

[0018] [Container Body] The container body 110 includes a cylindrical member 110A having an opening 113 at the upper end, and a lid member 110B that closes at least a portion of the opening 113 of the cylindrical member 110A. Note that, in this embodiment, a configuration in which the cylindrical member 110A and the lid member 110B are independent will be described, but this is not limiting, and the cylindrical member 110A and the lid member 110B may be integrally molded.

[0019] The tubular member 110A has a bottom 111 and a cylindrical side 112 (lower side) extending upward from the periphery of the bottom 111, and is formed as a bottomed tube overall with an opening 113 at the upper end.

[0020] The side portion 112 has a large diameter portion 112a, a small diameter portion 112b having a diameter smaller than that of the large diameter portion 112a, and a connecting portion 112c provided between the large diameter portion 112a and the small diameter portion 112b. The large diameter portion 112a is formed by extending upward from the peripheral edge of the bottom portion 111. The small diameter portion 112b is provided above the large diameter portion 112a. The axial length L of the small diameter portion 112b is preferably longer than the inner diameter D of the small diameter portion 112b (or the maximum inner diameter if the diameters vary in the axial direction) from the viewpoints of ensuring a residual gas processing space IS2 (described later), retaining bubbles of the residual pre-processing liquid, increasing opportunities for contact with gas, and improving processing efficiency (see FIG. 2).

[0021] The connecting portion 112c is formed to be inclined (narrowed) toward the center in the radial direction and upward, specifically, extending from the upper end of the large diameter portion 112a to the lower end of the small diameter portion 112b. This configuration facilitates the mutual adhesion of the foam F formed on the liquid level LL of the liquid present inside the container body 110, thereby increasing the contact area between the remaining untreated liquid and gas (gas remaining in the liquid treatment space IS1, described below) that constitute the foam F. Another advantage is that the foam and liquid are easily separated.

[0022] In the present embodiment, the side portion 112 (i.e., the container body 110) is described as having a cylindrical shape with a large diameter portion 112a, a small diameter portion 112b, and a connecting portion 112c. However, this is not limited thereto and the side portion 112 (i.e., the container body 110) may be formed in a rectangular cylindrical shape. Furthermore, in the present embodiment, the connecting portion 112c is described as being radially centered and inclined upward. However, this is not limited thereto. For example, the connecting portion 112c may be formed as a flat surface extending horizontally (perpendicular to the vertical direction), and the large diameter portion 112a, the small diameter portion 112b, and the connecting portion 112c may be formed in a stepped shape as a whole. Furthermore, in the present embodiment, the large diameter portion 112a, the small diameter portion 112b, and the connecting portion 112c are described as being integrally formed. However, this is not limited thereto and the large diameter portion 112a, the small diameter portion 112b, and the connecting portion 112c may be formed independently. For example, a first cylindrical member having a bottom 111 and a large diameter portion 112a and a second member having a small diameter portion 112b may be connected by a cylindrical connecting member having a connecting portion 112c, thereby configuring the connecting portion 112c to be positioned between the large diameter portion 112a and the small diameter portion 112b.

[0023] The lid member 110B has a top portion 114 and a cylindrical side portion 115 (upper side portion) extending downward from the periphery of the top portion 114, and is formed as a cylinder with an open bottom end overall.

[0024] The top portion 114 is formed to be inclined (narrowed) toward the center in the radial direction and toward the upper side. This configuration has the advantage of facilitating separation of the foam and the liquid. The side portion 115 has an inner diameter larger than the outer diameter of the small diameter portion 112b. In this embodiment, an annular sealing member 150 is provided between the inner surface of the side portion 115 and the outer surface of the small diameter portion 112b. This configuration has the advantage of preventing fluid from leaking from the container body 110. Any sealing member such as an O-ring or Y-packing can be used as the sealing member 150. The sealing member 150 may be molded integrally with the container body 110.

[0025] The container body 110 has an outlet 116 for discharging the processed liquid to the outside of the container body 110, an inlet 117 for introducing gas into the inside of the container body 110, and an exhaust section 118 for discharging the gas to the outside of the container body 110.

[0026] The outflow port 116 is provided in the vertical midway portion of the container body 110. Specifically, the outflow port 116 is an opening provided in the side portion 112 of the tubular member 110A, between the large diameter portion 112a and the small diameter portion 112b (in this embodiment, the connecting portion 112c). This configuration has the advantage that it is easier to allow the liquid to flow out than when the outflow port 116 is provided in the large diameter portion 112a or the small diameter portion 112b, and also that it is easier to attach a tube joint 430, which will be described later.

[0027] Only one outlet 116 may be provided in the circumferential direction of the container body 110, or two or more may be provided along the circumferential direction of the container body 110. Providing multiple outlets 116 has the advantage of increasing the liquid outflow efficiency and suppressing the rise of the liquid level LL of the liquid present inside the container body 110. From the perspective of suppressing the rise of the liquid level LL of the liquid present inside the container body 110, the opening area of ​​the outlet 116 is preferably larger than the opening area of ​​the liquid introduction section 120. Note that the "opening area of ​​the outlet" refers to the opening area of ​​the outlet 116 when there is one outlet 116, and refers to the total opening area of ​​all the outlets 116 when there are two or more outlets 116. Similarly, the "opening area of ​​the liquid introduction section" refers to the opening area of ​​the liquid introduction section 120 when there is one liquid introduction section 120, and refers to the total opening area of ​​all the liquid introduction sections 120 when there are two or more liquid introduction sections 120.

[0028] The inlet 117 is an opening provided in the top 114 of the cover member 110B. The inlet 117 may be provided at any position on the side 112 of the tubular member 110A.

[0029] The exhaust section 118 is formed in a tubular shape with both ends open, and is provided above the outlet 116. Specifically, the exhaust section 118 is formed extending from the center of the top 114 of the lid member 110B. The exhaust section 118 may be an opening formed above the outlet 116, preferably at any position on the top 114. The exhaust section 118 is configured to exhaust gas (e.g., oxygen if the gas that constituted the foam F was ozone) remaining after the foam F breaks down in the residual gas treatment space IS2. The gas exhausted from the exhaust section 118 can be supplied via a flow path (not shown) to any supply target (not shown), such as a blower used in a biological treatment tank.

[0030] The container body 110 having the above-described configuration is configured to bring the pre-processing liquid introduced into the container body 110 into contact with the gas released into the container body 110 in the space below the outlet 116 (liquid processing space IS1), thereby processing the pre-processing liquid introduced into the container body 110.

[0031] In addition, the container body 110 is configured to bring the remaining pre-treatment liquid into contact with the excess gas in the liquid treatment space IS1 in the space above the outlet 116 (residual gas treatment space IS2), thereby treating the remaining pre-treatment liquid.

[0032] In this embodiment, the liquid processing space IS1 is a space for bringing the liquid and the gas into contact by generating bubbles B in the liquid. On the other hand, the residual gas processing space IS2 is a space for bringing the liquid and the gas into contact with each other over a larger contact area than the liquid processing space IS1 by positioning bubbles F formed on the liquid surface LL of the liquid present inside the container body 110.

[0033] [Liquid Introduction Portion] The liquid introduction portion 120 is configured to introduce the pre-treatment liquid below the outlet 116. Specifically, the liquid introduction portion 120 is an opening provided below the outlet 116 (i.e., in the large diameter portion 112a of the side portion 112 of the tubular member 110A). Only one liquid introduction portion 120 may be provided, or two or more liquid introduction portions 120 may be provided.

[0034] In this embodiment, the liquid introduction part 120 is an opening provided in the large diameter part 112a, but the present invention is not limited to this. For example, like the gas supply part 140 described below, the liquid introduction part 120 may be formed in a tubular shape and attached to an inlet for the pre-treatment liquid provided in the small diameter part 112b of the cylindrical member 110A or the top part 114 of the cover member 110B.

[0035] [Gas Release Section] The gas release section 130 is provided below the outlet 116 and is configured to release gas below the outlet 116. Specifically, the gas release section 130 is configured to generate bubbles B below the outlet 116 (see FIGS. 3 and 4). This configuration has the advantage of increasing the contact area per unit volume between the liquid and the gas, thereby improving the liquid processing efficiency. For example, an air stone or an air diffuser can be used as this gas release section 130.

[0036] [Gas Supply Unit] The gas supply unit 140 is formed in a tubular shape with open upper and lower ends. The upper end of the gas supply unit 140 is detachably attached to a tube joint 330 inserted into the inlet 117 of the container body 110, and is thereby detachably attached to the top 114 of the lid member 110B. In addition, the gas release unit 130 is detachably attached to the lower end of the gas supply unit 140. With this configuration, the gas release unit 130 and the gas supply unit 140 can be removed simultaneously when the lid member 110B is removed from the tubular member 110A, which has the advantage of making it easy to replace and clean the gas release unit 130 and the gas supply unit 140.

[0037] [Configuration of liquid supply mechanism] As shown in Figure 1, the liquid supply mechanism 200 includes a liquid storage tank 210 capable of storing pre-treatment liquid, a liquid supply flow path 220 that supplies the pre-treatment liquid stored in the liquid storage tank 210 to the gas-liquid contactor 100, and a tube joint 230 that connects the liquid supply flow path 220 and the gas-liquid contactor 100.

[0038] The untreated liquid stored in the liquid storage tank 210 may be any liquid that requires treatment, such as wastewater discharged from a home. The liquid supply flow path 220 is formed in a tubular shape having an internal space that allows the untreated liquid to flow. One end of the liquid supply flow path 220 in the flow direction is connected to the liquid storage tank 210, and the other end of the liquid supply flow path 220 in the flow direction is connected to a tube joint 230. The tube joint 230 is attached to the container body 110 of the gas-liquid contactor 100 by being inserted into the liquid introduction part 120 of the gas-liquid contactor 100.

[0039] The liquid supply mechanism 200 having the above configuration is configured to supply the pre-treatment liquid stored in the liquid storage tank 210 to the gas-liquid contact container 100 via the liquid supply flow path 220 and the tube joint 230 by using a water supply device (not shown) such as a pump to supply the pre-treatment liquid.

[0040] [Configuration of the gas introduction mechanism] As shown in Figure 1, the gas introduction mechanism 300 includes a gas generation device 310 that generates gas, a gas supply flow path 320 that supplies the gas generated by the gas generation device 310 to the gas-liquid contactor 100, and a tube joint 330 that connects the gas supply flow path 320 and the gas-liquid contactor 100.

[0041] The gas generator 310 is configured to generate a gas to be brought into contact with the untreated liquid. Examples of the gas generated by the gas generator 310 include, but are not limited to, ozone, and other gases (e.g., air, inert gas, etc.) appropriate for the treatment of the untreated liquid may also be used. The gas supply flow path 320 is formed in a tubular shape having an internal space capable of flowing gas. One end of the gas supply flow path 320 in the flow direction is connected to the gas generator 310, and the other end of the gas supply flow path 320 in the flow direction is connected to a tube joint 330. The tube joint 330 is attached to the container body 110 of the gas-liquid contact container 100 by being inserted into the inlet 117 of the gas-liquid contact container 100.

[0042] The gas introduction mechanism 300 having the above configuration is configured to introduce gas into the gas-liquid contact container 100 via the gas supply flow path 320 and the tube joint 330 by sending the gas generated by the gas generator 310 using an air supply device (not shown) such as a pump or blower.

[0043] [Liquid storage mechanism] As shown in FIG. 1 , the liquid storage mechanism 400 includes a liquid storage tank 410 capable of storing the treated liquid, a liquid supply flow path 420 that supplies the treated liquid flowing out from the gas-liquid contactor 100 to the liquid storage tank 410, and a tube joint 430 that connects the liquid supply flow path 420 and the gas-liquid contactor 100.

[0044] The liquid supply flow path 420 is formed in a tubular shape having an internal space that allows the post-treatment liquid to flow. One end of the liquid supply flow path 420 in the flow path direction is connected to the liquid storage tank 410, and the other end of the liquid supply flow path 420 in the flow path direction is connected to a tube joint 430. The tube joint 430 is attached to the vessel body 110 of the gas-liquid contact vessel 100 by being inserted into the outlet 116 of the gas-liquid contact vessel 100.

[0045] 3 and 4, a liquid treatment method using the gas-liquid contact system 1 will be described. In the following description, as an example, a liquid treatment method for purifying a liquid by bringing ozone into contact with the liquid will be described.

[0046] As shown in Figure 3, the untreated liquid stored in the liquid storage tank 210 is introduced into the liquid treatment space IS1 of the container body 110 via the liquid supply channel 220 and the tube joint 230 (see arrow F1 in Figures 3 and 4). Furthermore, ozone generated by the gas generator 310 is introduced into the liquid treatment space IS1 of the container body 110 via the gas supply channel 320 and the tube joint 330 (see arrow F2 in Figures 3 and 4), and is supplied to the gas release section 130 by the gas supply section 140. The gas release section 130 generates ozone bubbles B in the untreated liquid. The untreated liquid and the ozone bubbles B rise in the liquid treatment space IS1 of the container body 110 while coming into contact with each other (see arrow F3 in Figures 3 and 4).

[0047] As the untreated liquid and ozone bubbles B rise, they react with each other, and ozone treatment (sterilization, decolorization, deodorization, etc.) of the untreated liquid is performed. As shown in FIG. 4 , as the untreated liquid and ozone bubbles B rise, contaminants contained in the untreated liquid are adsorbed by the ozone bubbles B, and foam F containing concentrated contaminants is formed on the liquid surface LL of the liquid present inside the container body 110. This separates the contaminants contained in the untreated liquid from the untreated liquid. The untreated liquid becomes a treated liquid and rises in the liquid treatment space IS1 of the container body 110. That is, of the liquid rising in the liquid treatment space IS1, the liquid near the bottom is the untreated liquid, and the majority of the liquid near the liquid surface LL is the treated liquid.

[0048] As shown in Figure 4, the processed liquid obtained by processing in the liquid processing space IS1 of the container body 110 is supplied to the liquid storage tank 410 via the tube joint 430 and the liquid supply flow path 420 (see arrow F4 in Figure 4), and is stored in the liquid storage tank 410.

[0049] Meanwhile, bubbles F formed on the liquid level LL of the liquid present inside the container body 110 expand due to the ozone released from the liquid level LL, and are pushed up by subsequent bubbles F, causing them to rise in the residual gas treatment space IS2 (see arrow F5 in FIG. 4). During the process of the bubbles F rising, the residual pre-treatment liquid and ozone (excess ozone in the liquid treatment space IS1) that make up the bubbles F react with each other, and the residual pre-treatment liquid that makes up the bubbles F is ozone-treated. The bubbles F that have undergone the ozone treatment of the residual pre-treatment liquid break down as the viscosity and surface tension of the residual pre-treatment liquid decrease with purification.

[0050] After the foam F breaks down, the remaining untreated liquid that constituted the foam F returns to the liquid treatment space IS1 of the container body 110, is supplied to the liquid storage tank 410 via the tube joint 430 and the liquid supply flow path 420, and is stored in the liquid storage tank 410. In addition, oxygen remaining after the foam F breaks down (oxygen generated by decomposition of ozone) is exhausted from the exhaust section 118.

[0051] [Advantages of the gas-liquid contact system and gas-liquid contact container according to this embodiment] The gas-liquid contact system 1 according to this embodiment comprises a gas-liquid contact container 100, a liquid supply mechanism 200 that supplies liquid to the gas-liquid contact container 100, and a gas introduction mechanism 300 that introduces gas into the gas-liquid contact container 100. The gas-liquid contact container 100 comprises a cylindrical container body 110 that extends along the vertical direction, a liquid introduction section 120 that introduces the liquid supplied from the liquid supply mechanism 200 into the container body 110, and a gas release section 130 that releases the gas introduced from the gas introduction mechanism 300 into the container body 110. The container body 110 has an outlet 116 in the vertical midpoint of the container body 110 that allows the liquid to flow out of the container body 110, and the gas release section 130 is configured to release the gas below the outlet 116.

[0052] In the gas-liquid contact system 1 (and gas-liquid contactor 100) having such a configuration, the outlet 116 is provided in the vertical midpoint of the vessel body 110, so that a space (residual gas processing space IS2) above the outlet 116 can be formed inside the vessel body 110. This allows the liquid (untreated liquid) and gas to come into contact in the space (liquid processing space IS1) below the outlet 116, and then the liquid (residual untreated liquid) with further concentrated pollutants can come into contact with the gas in the residual gas processing space IS2, which has the advantage of improving the liquid processing efficiency. Furthermore, for example, if the gas is a harmful gas containing ozone or the like, the gas remaining in the liquid processing space IS1 can be reused in the residual gas processing space IS2, which has the advantage of effectively utilizing and detoxifying the gas remaining in the liquid processing space IS1.

[0053] In the gas-liquid contactor 100 according to this embodiment, the vessel body 110 has an exhaust section 118 for discharging gas above the outlet 116. The gas-liquid contactor 100 having such a configuration has the advantage that, because the exhaust section 118 is provided above the outlet 116, a space (residual gas treatment space IS2) can be secured for effectively utilizing the gas remaining after contact with the liquid (untreated liquid).

[0054] In the gas-liquid contactor 100 according to this embodiment, the vessel body 110 has a large-diameter portion 112a and a small-diameter portion 112b, the small-diameter portion 112b being smaller in diameter than the large-diameter portion 112a. The small-diameter portion 112b is located above the large-diameter portion 112a, and the outlet 116 is located between the large-diameter portion 112a and the small-diameter portion 112b. The gas-liquid contactor 100 having such a configuration has the advantage that the small-diameter portion 112b facilitates the mutual adhesion of the bubbles F formed on the liquid level LL of the liquid present inside the vessel body 110, thereby increasing the contact area between the liquid (residual untreated liquid) and the gas (excess gas in the liquid treatment space IS1) that constitute the bubbles F. Furthermore, since the outlet 116 is located between the large-diameter portion 112a and the small-diameter portion 112b, the liquid (treated liquid) can be easily discharged.

[0055] In the gas-liquid contactor 100 according to this embodiment, one or more outlets 116 are provided along the circumferential direction of the container body 110. The gas-liquid contactor 100 having such a configuration has the advantage that the outflow efficiency of the liquid (treated liquid) can be increased, and therefore the rise of the liquid level LL of the liquid present inside the container body 110 can be suppressed.

[0056] [Modifications] The gas-liquid contactor vessel and gas-liquid contactor system according to the present invention are not limited to the above-described embodiments, and various modifications can be made within the scope that does not deviate from the technical concept of the present invention.

[0057] In the above-described embodiment, a configuration has been described in which the container body 110 has a large diameter portion 112a and a small diameter portion 112b, but this is not limited to this, and the diameter of the container body 110 may be constant in the axial direction of the container body 110, or the large diameter portion 112a and the small diameter portion 112b may be arranged in opposite directions (i.e., a configuration in which the diameter of the residual gas processing space IS2 is larger than the diameter of the liquid processing space IS1).

[0058] In the above-described embodiment, a configuration was described in which the treated liquid is supplied to the liquid storage tank 410, but this is not limited to this, and the treated liquid may be supplied to and circulated in another tank, such as a biological treatment tank.

[0059] In the above-described embodiment, a configuration in which the treated liquid is supplied to the liquid storage tank 410 via the tube joint 430 and the liquid supply channel 420 has been described, but the present invention is not limited to this. For example, as shown in Fig. 5, the gas-liquid contactor 100 may be accommodated in the liquid storage tank 410, and the treated liquid flowing out from the outlet 116 of the gas-liquid contactor 100 may be directly supplied to the liquid storage tank 410. Alternatively, when the liquid storage tank 210 is a biological treatment tank, the gas-liquid contactor 100 may be accommodated in the biological treatment tank, and the treated liquid may be returned directly to the biological treatment tank from the outlet 116 via the liquid introduction section 120 through the gas-liquid contactor 100, thereby replacing aeration. Furthermore, the gas-liquid contactor 100 may constitute part of the biological treatment tank or part of the piping.

[0060] It is clear from the claims that the above-mentioned modifications are included within the scope of the present invention.

[0061] DESCRIPTION OF SYMBOLS 1: Gas-liquid contact system 100: Gas-liquid contact vessel 110: Vessel body 110A: Cylindrical member 110B: Lid member 111: Bottom 112: Side 112a: Large diameter portion 112b: Small diameter portion 112c: Connecting portion 113: Opening 114: Top 115: Side 116: Outlet 117: Inlet 118: Exhaust portion 120: Liquid introduction portion 130: Gas release portion 140: Gas supply portion 150: Sealing member 200: Liquid supply mechanism 210: Liquid storage tank 220: Liquid supply flow path 230: Tube joint 300: Gas introduction mechanism 310: Gas generator 320: Gas supply flow path 330 : Tube joint 400 : Liquid storage mechanism 410 : Liquid storage tank 420 : Liquid supply flow path 430 : Tube joint B : Air bubble F : Foam IS1 : Liquid processing space IS2 : Residual gas processing space LL : Liquid surface

Claims

1. A gas-liquid contact container comprising: a cylindrical container body extending in a vertical direction; a liquid introduction section for introducing a liquid into the container body; and a gas release section for releasing a gas into the container body, wherein the container body has an outlet port at a vertical midpoint of the container body for discharging the liquid to the outside of the container body, and the gas release section is configured to release the gas below the outlet port.

2. A gas-liquid contact vessel according to claim 1, wherein the vessel body has an exhaust section for discharging gas above the outlet.

3. A gas-liquid contact vessel according to claim 1 or 2, wherein the vessel body has a large diameter portion and a small diameter portion having a diameter smaller than that of the large diameter portion, the small diameter portion is provided above the large diameter portion, and the outlet is provided between the large diameter portion and the small diameter portion.

4. A gas-liquid contact vessel according to claim 1 or 2, wherein one or more outlets are provided along the circumferential direction of the vessel body.

5. A gas-liquid contact system comprising: a gas-liquid contact vessel; a liquid supply mechanism for supplying liquid to the gas-liquid contact vessel; and a gas introduction mechanism for introducing gas into the gas-liquid contact vessel, wherein the gas-liquid contact vessel comprises a cylindrical vessel body extending in a vertical direction; a liquid introduction section for introducing liquid supplied from the liquid supply mechanism into the interior of the vessel body; and a gas release section for releasing gas introduced from the gas introduction mechanism into the interior of the vessel body, wherein the vessel body has an outlet in a vertical midpoint of the vessel body for discharging the liquid to the outside of the vessel body, and the gas release section is configured to release the gas below the outlet.

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