JP2012187576A - Apparatus and method for treating liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for treating liquid which efficiently removes dissolved gases from water to be treated, while minimizing a decline in productivity and an increase in running cost in a saved space.SOLUTION: The apparatus for treating liquid includes a water feed device 10 pressure-feeding the water to be treated, a gas feed device 20 pressure-feeding the gases, a mixer 30 mixing the gases with the water to be treated, a cylindrical treating vessel 33 pressure-blowing the water to be treated mixed with air separated through a branched pipe 32, and an exhaust valve 34 exhausting the gases from a vapor phase in the treating vessel 33. In the treating vessel 33, the vapor/liquid phases are maintained, the water to be treated from branched pipe 32 is pressure-blown from the top through the vapor phase and then is agitated and mixed with a hot spring water in the vessel, and the gases in the vapor phase of the treating vessel 33 are dissolved in the liquid in the liquid phase. Thus, the gases such as methane contained in the water to be treated are removed.

Description

  The present invention relates to a liquid processing apparatus and a liquid processing method suitable for removing a gas such as methane gas dissolved in a liquid mainly composed of water such as hot spring water.

  Natural water (main component methane) that is a combustible gas is often dissolved in groundwater used for applications such as drinking water and hot spring water, and natural gas degassed from the groundwater accumulates. An explosion has occurred. Therefore, when groundwater is used for uses such as drinking water and hot spring water, it is regulated to remove dissolved combustible gas to a specified value or less.

  Conventionally, as a method for degassing a dissolved gas contained in a gas to be treated, a method for reducing the pressure of a container containing a liquid (for example, refer to Patent Document 1), or a gas to be treated that is not subject to removal at normal pressure. A method of desorbing dissolved gas by bubbling is known (see, for example, Patent Document 2).

JP 2006-265850 A JP-A-6-23349

By the way, groundwater such as hot spring water is usually supplied using a water supply pipe in a pressurized state by being pumped up by a pump.
In the conventional technology, in order to remove dissolved methane gas from the pressurized water to be treated, it is necessary to perform degassing treatment after depressurizing or normalizing the water to be treated. In order to supply it, it is necessary to pressurize the water to be treated again, which requires a pressure boosting equipment, and also causes an increase in running cost.
In addition, in the case of water to be treated containing minerals such as groundwater, when deaeration treatment is performed at normal pressure / open type, algae and aquatics are generated, which is not preferable in terms of hygiene. In addition, the normal pressure / open type deaeration device tends to be large in size, and is difficult to apply in small scale applications.

As described above, there are still many problems in the conventional liquid processing equipment.
Under such circumstances, an object of the present invention is to provide a liquid treatment capable of avoiding a decrease in productivity and an increase in running cost as much as possible in a reduced installation space, and removing dissolved gas from the water to be treated according to the amount of water passing efficiently. An apparatus and a liquid processing method are provided.
Further, the present invention provides a liquid processing apparatus and a liquid processing method suitable for applications such as removing dissolved gas (treated gas) components contained in a liquid mainly composed of water or dissolving a gas in the liquid. It is to provide.

According to the first aspect of the present invention, there is provided a processing apparatus for processing while flowing a liquid mainly composed of water as water to be treated,
A sealed treatment tank in which a gas phase and a liquid phase coexist;
An injection pipe that is connected to the upper end of the processing tank and continuously injects a mixed fluid obtained by mixing a gas into the liquid from the front end to the liquid phase through the gas phase in the processing tank;
A discharge port provided in the processing tank, for continuously discharging the liquid phase liquid from the processing tank;
An exhaust port provided in the processing tank and exhausting the gas in the gas phase from the processing tank;
The height of the gas phase in the treatment tank is substantially constant by adjusting the flow rate of at least one of the gas and liquid constituting the mixed fluid, the liquid discharged from the discharge port, and the gas discharged from the exhaust port. And a flow rate adjusting means for maintaining the liquid processing apparatus.

According to the second aspect of the present invention, there is provided a processing method for processing while flowing a liquid mainly composed of water as water to be treated,
Mixing a gas with the liquid to form a mixed fluid;
Continuously injecting the mixed fluid into the liquid phase via the gas phase in the processing tank from an injection pipe connected to an upper part of a closed processing tank in which the gas phase and the liquid phase coexist. ,
Continuously discharging the liquid phase liquid in the treatment tank;
Adjusting the displacement of the gas in the gas phase of the treatment tank;
The gas phase in the processing tank is adjusted by adjusting at least one flow rate of the gas and liquid constituting the mixed fluid, the liquid phase liquid discharged from the processing tank, and the gas phase gas exhausted from the processing tank. A liquid processing method is provided that includes maintaining a substantially constant height of the liquid.

  According to the first and second aspects of the present invention, since the mixed fluid is continuously injected from the injection pipe into the liquid phase via the gas phase of the processing tank, the mixed fluid violently collides with the liquid phase, and By entering the deep part of the liquid phase, the gas contained in the mixed fluid can be easily dissolved in the liquid mainly composed of water. Further, the gas in the gas phase in the closed treatment tank can be dissolved in the liquid in the liquid phase. On the other hand, the gas (gas to be removed such as harmful gas) contained in water can be replaced with the gas contained in the mixed fluid.

  The liquid processing apparatus of the present invention further includes a mixer for forming a fluid mixture to the ejection pipe, and the mixer has a flow path through which the liquid circulates and is accommodated in the flow path. It is preferable to have a nozzle for jetting gas.

  In the liquid processing apparatus and the liquid processing method of the present invention, the processing tank is a horizontally placed cylindrical container, and the spray pipe is a plurality of sprays arranged at predetermined intervals along the central axis of the processing tank. And the injection direction of the mixed fluid from the injection unit may be arranged so as to be orthogonal to the central axis of the processing tank and toward the central axis of the processing tank, and the injection pipe is injected It is preferable that the mixed fluid is ejected from the ejection pipe so that bubbles in the mixed fluid reach the bottom of the treatment tank. Moreover, in the said processing tank, it can be seen that the jetted mixed fluid flows back along the inner peripheral wall of the container. Further, the spray pipe may be connected to the upper part of the processing tank such that the tip of the spray pipe protrudes from the upper part of the processing tank into the tank. Further, the spray pipe may be composed of a plurality of branch pipes arranged in parallel at a predetermined distance from each other, and each branch pipe may be connected to the upper part of the processing tank so as to be orthogonal to the upper surface of the processing tank.

  In the liquid processing apparatus and the liquid processing method of the present invention, the gas phase pressure is preferably adjusted to 0.12 MPa to 0.18 MPa. The exhaust port is preferably provided with an exhaust valve that adjusts the pressure of the gas phase by adjusting the degree of opening of the exhaust port. It is preferable to maintain the height of the gas phase in the processing tank at 5 to 50% of the height inside the processing tank (gas phase + liquid phase).

  In the liquid treatment apparatus and the liquid treatment method of the present invention, when the water to be treated is hot spring water and the gas is air, methane contained in the hot spring water is obtained by passing the mixed fluid through the treatment tank. Can be removed. The present invention also provides a system in which a plurality of the liquid processing apparatuses are connected in series, and the liquid discharged from the upstream liquid processing apparatus can be introduced into the downstream liquid processing apparatus after being mixed with gas. The

  In the liquid treatment method of the present invention, when the water to be treated is sewage, methane contained in the sewage can be removed by being treated in the treatment tank, and the water to be treated is water for agriculture or fishery. In this case, the gas can be air and the liquid treated in the treatment tank can be enriched with oxygen.

  According to another aspect, a mixer for mixing the water to be treated in which the gas to be treated fed from the water feeding device is dissolved and the degassing gas fed by pressure from the air feeding device, and the degassing gas from the mixer The mixed water to be treated is injected under pressure from the upper part of the tank body, so that it is stirred and mixed with the water to be treated accumulated in the tank, and the degassed gas is dissolved in the water to be treated. In a state where the gas is discharged into the upper space in the tank and the processing tank formed in a cylindrical shape for draining the water to be processed discharged from the gas to be processed, and the upper space in the processing tank is maintained at a predetermined pressure, There is provided a liquid treatment apparatus comprising an exhaust valve for exhausting a gas to be treated discharged from water to be treated.

  According to still another aspect, a mixing step of mixing the water to be treated in which the pumped gas to be treated is dissolved and the pumped degassed gas, the degassed gas is mixed by the mixing step, and the pumped gas to be processed is mixed. Discharge step in which treated water is injected under pressure from the upper part of the tank body formed in a cylindrical shape, and by the discharge step, the treated water accumulated in the tank is agitated and mixed, and degassed gas is treated into the treated water. Dissolving and discharging the treated gas from the treated water to the upper space in the tank, and draining the treated water discharged from the treated gas, and the upper space in the treating tank by the treating step An exhaust step of exhausting the gas to be treated discharged from the water to be treated by an exhaust valve while maintaining a predetermined pressure is provided.

  According to the above-described another aspect and still another aspect, first, the degassing gas is mixed by the air supply device to the water to be processed in which the gas to be processed pressure-fed by the water supply device is dissolved (mixing step). In the discharge step, this water to be treated is sprayed from the upper part of the treatment tank formed in a cylindrical shape. Then, in the treatment tank, the stored treated water is vigorously stirred and mixed, the degassed gas is dissolved in the treated water, and the treated gas is discharged from the treated water into the upper space in the tank. The treated water discharged from the treated gas and degassed is drained from the treatment tank (treatment step). And the to-be-processed gas discharged | emitted from the to-be-processed water is exhausted by an exhaust valve in the state which maintained the upper space in a processing tank at the predetermined pressure (exhaust step). In this way, in the treatment tank under pressure, the treated gas mixed with the degassed gas can be replaced with the degassed gas by pressurizing and stirring and mixing, Degassing gas can be removed with a simple structure. Further, after the water to be treated is sprayed into the treatment tank by the water supply device and degassed in the treatment tank, the degassed water to be treated is drained, and the treated water to be treated is treated by the water supply device. By repeatedly supplying the water to be treated to the treatment tank, deaeration treatment can be performed one after another.

The treatment tank is formed in a cylindrical shape, and it is desirable that the treated water mixed with the degassed gas from the mixer is jetted under pressure from the upper part of the side surface of the body portion where the treatment tank is lying down.
The water to be treated which is pressure-injected from the upper part of the side surface of the trunk of the treatment tank is vigorously sprayed on the water to be treated collected in the tank. The sprayed water to be treated is separated when it reaches the bottom surface in the tank by this momentum, and rises along the inner peripheral surface. And when it reaches the vicinity of the water surface, it starts to descend again toward the bottom surface together with the water to be treated which has been further pressure-injected. The bubbles of the degassed gas mixed with the water to be treated in such a flow are dissolved in the water to be treated by being stirred and mixed with the water to be treated for a long time. By dissolving the degassing gas in the water to be treated, the dissolved gas to be treated can be efficiently discharged instead.

  A branch pipe for discharging the treated water mixed with degassed gas into the treatment tank as two or more discharged water is provided, and the branch pipe is a main pipe through which the treated water mixed with the degassed gas flows. And a plurality of branch pipes having an inner diameter smaller than that of the main pipe. In order to maintain the performance of the water supply apparatus appropriately corresponding to the amount of water to be treated mixed with degassed gas, the water to be treated is branched as two or more discharge waters by a branch pipe. And by jetting and discharging into the treatment tank, the particle size of the bubbles is reduced and subdivided in the treatment tank, and the opportunity for contact between the degassed gas and the water to be treated is increased, so that the degassed gas can be easily dissolved. it can. Therefore, it is possible to degas the gas to be processed more efficiently. In addition, by using a branch pipe whose branch pipe has a diameter smaller than that of the main pipe, when the water to be treated moves from the main pipe to the branch pipe, the water flow rate increases and the water can be sprayed vigorously into the treatment tank. As a result, the water to be treated can be vigorously stirred and mixed in the tank.

  Here, when the tip of the branch pipe is provided so as to protrude downward into the space from the upper part of the treatment tank, the branch pipe is left in a state where the water to be treated is directed downward from the upper part of the treatment tank. Since it can be injected under pressure to the water to be treated that has been guided and accumulated in the tank, it can be further vigorously stirred and mixed.

The mixer is provided in an outer pipe to which water to be treated from the water feeding device is pumped, and a first pipe disposed in the pipe and provided at a tip of an inner pipe to which degassed gas from the air feeding device is pumped. It is preferable that the first nozzle is made to function as the second nozzle by forming the distal end portion of the outer pipe with a reduced diameter so that the cross-sectional area of the water passage gradually decreases in the water passage direction.
When the water to be treated from the water feeding device reaches the first nozzle through the outer tube, the degassed gas jetted vigorously from the first nozzle is mixed and further boosted by the jetting of the degassed gas. Increase. The water to be treated in a mixed state is gradually gathered as it approaches the tip of the outer tube that functions as the second nozzle, and pressure is applied. And the to-be-processed water mixed with the deaeration gas is accelerated by the second nozzle (outer pipe), and the deaeration gas is disturbed in the to-be-treated water, so that the deaeration gas can be easily dissolved in the to-be-treated water. In addition, it is possible to improve the discharge force to the treatment tank.

  In addition, if two or more processing apparatuses are connected in series, the gas to be processed that could not be removed in the processing tank can be removed by the processing apparatus in the next stage (downstream side). The gas to be treated can be removed from the water to be treated without reducing the amount of treated water that has been pumped.

  According to the present invention, degassing gas can be efficiently removed with a simple structure, so that reduced productivity and running costs are avoided as much as possible in a small installation space, and dissolved gas is efficiently removed from the water to be treated. Is possible. Moreover, since this invention is excellent in productivity, a processing tank etc. can be comprised compactly. Furthermore, in the present invention, since an aeration tank is not required and the water to be treated is not exposed to the atmosphere, it is possible to perform a deaeration process while maintaining the temperature when pumping from the water feeding device. is there.

  Further, according to the present invention, the gas contained in the mixed fluid is easily dissolved in the liquid mainly composed of water, and the gas contained in the water can be replaced with the gas contained in the mixed fluid. Removal of a specific component contained in a liquid mainly composed of water and / or an increase in the dissolved amount of another gas component in the liquid mainly composed of water can be realized with a simple apparatus configuration.

It is a front view which shows the liquid processing apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the mixer of the liquid processing apparatus shown in FIG. It is sectional drawing of the direction orthogonal to the axial direction for demonstrating the flow of the hot spring water discharged in the processing tank of the liquid processing apparatus shown in FIG. It is sectional drawing of the direction along the axial direction for demonstrating the flow of the hot spring water discharged in the processing tank of the liquid processing apparatus shown in FIG. It is a front view which shows the liquid processing apparatus which concerns on 2nd Embodiment of this invention. It is a left view of the liquid processing apparatus shown in FIG. It is a right view of the liquid processing apparatus shown in FIG. It is a front view which shows the modification of the liquid processing apparatus which concerns on 2nd Embodiment shown in FIG. It is the photograph which image | photographed the mode of the reflux which arises in the direction orthogonal to the axis | shaft of the longitudinal direction of the process tank which generate | occur | produces in an acrylic process tank. It is a photograph which shows the mode of the reflux which arises in the longitudinal direction of the processing tank which generate | occur | produces in the acrylic processing tank. It is a graph which shows the change of the dissolved amount of methane and oxygen with respect to the air introduction amount in Example 7. It is a graph which shows the change of the dissolved amount of methane and oxygen with respect to the air introduction amount in Example 8. It is a table | surface which shows the experimental condition and result which processed by changing the air quantity in Examples 7-9.

First Embodiment A liquid processing apparatus according to a first embodiment of the present invention will be described with reference to the drawings.
The liquid treatment apparatus discharges and removes the gas to be treated from the water to be treated in which the gas to be treated is dissolved. In the first embodiment, the water to be treated will be described as hot spring water and the gas to be treated as methane gas.

As shown in FIG. 1, the liquid processing apparatus removes methane gas from hot spring water and supplies it to the bathtub B. The liquid processing apparatus includes a water supply device 10, an air supply device 20, and a processing unit 30.
The water supply device 10 is a water supply pump that pumps hot spring water from the water distribution pipe 11 to the treatment unit 30 via the water supply pipe 12. As long as the water supply device 10 can pump hot spring water, various water supply pumps can be used. However, a turbo pump, a positive displacement pump, or the like can be used.

The air supply device 20 is a blower (gas supply device) that pressure-feeds air (degassed gas) that is a gas to the processing unit 30. As the air supply device 20, various compressors, fans, blowers, and the like can be used as long as air (gas) can be pumped. The air supply device 20 is provided with a gas flow meter (not shown) so as to be visible for maintaining the device.
The processing unit 30 mainly includes a mixer 31, a branch pipe 32, a processing tank 33, and an exhaust valve 34.

The mixer 31 has an outer pipe 31b in which an internal flow path 31d is formed, and the air fed from the air feeding device 20 and the hot spring water fed from the water feeding device 10 in the internal flow path 31d. And mix. Here, the mixer 31 is demonstrated based on FIG.
In the internal flow path 31d of the mixer 31, a pipe from the air supply device 20 is connected to the base end 311 and an inner pipe 31a to which air is pumped is arranged coaxially with the outer pipe 31b. The water supply pipe 12 from the water supply device 10 is connected to a part (base end portion 311) of the outer surface of the outer pipe 31b. That is, the mixer 31 is formed in a double tube structure including an outer tube 31b and an inner tube 31a.

  At the tip of the inner tube 31a, a first nozzle 31c is provided that discharges the air pumped by the air supply device 20 into the hot spring water. In the present embodiment, a tank mixing eductor is employed as the first nozzle 31c. At the distal end portion 313 opposite to the base end portion 311 of the outer pipe 31b, the inner diameter gradually decreases in the direction of water flow (downstream) and is opened as a discharge port 31e provided at the end. By doing so, the front-end | tip part 313 of the outer side pipe | tube 31b functions as a 2nd nozzle.

  As shown in FIG. 1, the branch pipe 32 has a main pipe 321 coaxially connected to the downstream side of the mixer 31, and one end connected to the main pipe 321 at equal intervals in the longitudinal direction. It has the some branch pipe 322 (322a-322d) extended in the direction (lower side) orthogonal to the longitudinal direction of the pipe | tube 321. FIG. The plurality of branch pipes 322 are arranged with respect to the processing tank 33 so that the central axis thereof is directed to the central axis of the cylindrical processing tank 33, and the other ends of the plurality of branch pipes 322 are arranged on the outer peripheral surface of the processing tank 33. They are connected at equal intervals on the longitudinal line (the ridgeline in the horizontal position). The inner diameter d1 of the branch pipe 322 is smaller than the inner diameter d0 of the main pipe 321. In order for the fluid mixture injected from the branch pipe 322 to flow into the liquid phase in the treatment tank 33 vigorously, the inner diameter d1 of the branch pipe 322 varies depending on the number of the branch pipes 322, but when the number of branch pipes 322 is four, the main pipe It is desirable to be less than or equal to one half of the inner diameter d0 of 321 (when N is the number of branch pipes 322, √Nth of the inner diameter d0 of the main pipe 321 is desirable). In the present embodiment, four branch pipes 322 are provided according to the length of the treatment tank 33, but can be any number depending on the conditions such as the component of the treated water, the amount of water, and the water pressure. The other end of the branch pipe 322 is connected to the upper surface 33a of the processing tank 33, and protrudes from the upper surface of the processing tank 33 into the space inside the processing tank 33 with a predetermined length. The protrusion amount can be set to 10 to 30 mm, for example.

The processing tank 33 is a cylindrical container having an inner diameter larger than that of the main pipe 321, and is installed in a laterally (falling down) state so that its axis (longitudinal direction) is a horizontal direction. As described above, the other end of the branch pipe 322 of the branch pipe 32 is connected to the upper surface 33a of the processing tank 33 in a penetrating state. A pressure gauge 331 for monitoring the pressure in the tank body is provided on one end surface 33 b of the processing tank 33. A drain port for draining hot spring water from which methane gas has been degassed is provided at the lower portion of the other end surface 33c of the treatment tank 33, and a drain pipe 332 is connected to the drain port. Further, one end of an exhaust pipe 333 is connected to an upper part of the other end surface 33c of the processing tank 33 to an exhaust port for exhausting methane gas discharged in the tank. An exhaust valve 34 is provided at the other end of the exhaust pipe 333.
The exhaust valve 34 includes a flow rate adjustment valve 341 that restricts the flow rate of methane gas, which is a gas to be processed, accumulated in the upper space S (gas phase) of the treatment tank 33, and is normally open, but water is contained in the valve. A gas vent 342 is provided that closes and restricts the discharge of water when the float rises and the internal float rises. A plurality of exhaust valves 34 may be provided. For example, two exhaust valves are provided, and the exhaust gas flow rate and the processing tank are determined depending on whether the two exhaust valves 34 are opened together, only one of them, or both are opened. The pressure in the partial space (gas phase) in 33 may be adjusted. In addition, you may adjust the pressure difference of the to-be-processed water supplied to a liquid processing apparatus, and the to-be-processed water discharged | emitted from a liquid processing apparatus by providing a pressure | voltage rise tank between the processing tank 33 and the bathtub B. FIG.

The operation and use state of the liquid processing apparatus according to this embodiment configured as described above will be described with reference to the drawings.
As shown in FIG. 1, first, the water supply device 10 and the air supply device 20 are started. Hot spring water pumped up by the water supply device 10 is pumped from the water distribution pipe 11 to the water supply pipe 12 through the water supply apparatus 10. Moreover, the air taken in by the air supply device 20 is pumped to the mixer 31 via the inner tube 31a.
In the mixer 31, as shown in FIG. 2, the air pressure-fed from the air supply device 20 to the inner pipe 31a is injected by the first nozzle 31c. At this time, the air sprayed from the diffuser provided at the tip of the first nozzle 31c is taken into the hot spring water pressure-fed from the water supply pipe 12 to the tip 313 of the outer pipe 31b. A mixed fluid is formed. The mixed fluid is diffused into the outer tube 31b. A part of the jetted air is dissolved in the hot spring water.

  When flowing through the tip 313 of the mixer 31, the mixed fluid flows toward the discharge port that functions as the second nozzle, where the cross-sectional area of the water passage gradually decreases, so further pressure is applied to the mixed fluid. The By applying this pressure, the mixed fluid is further accelerated (pressurized). The mixed fluid (hot spring water) in an accelerated state flows from the mixer 31 to the main pipe 321 of the branch pipe 32, so that mixing with air is further promoted, thereby increasing the dissolved amount of air in the mixed fluid. .

  The mixed fluid that has flowed through the main pipe 321 is further accelerated when it flows into the branch pipe 322 whose inner diameter is smaller than the inner diameter of the main pipe 321. Then, the mixed fluid whose flow velocity has been increased by the branch pipe 322 is pressurized and injected from the front end of the branch pipe 322 into the processing tank 33. Since the flow rate of the mixed fluid is increased (pressurized), the mixed fluid can vigorously collide with the hot spring water in the treatment tank 33 and reach the hot spring water at the bottom of the treatment tank. Due to the behavior of the mixed fluid, the hot spring water in the tank can be vigorously stirred and mixed as described later. Moreover, the tip of the branch pipe 322 is provided so as to protrude to the inside of the upper surface 33 a of the processing tank 33, so that the pressurized mixed fluid is brought to the surface of the hot spring water accumulated in the tank through the tip of the branch pipe 322. It can be guided to collide vertically. Therefore, even if the water feeding speed of the water feeding device 10 is not high, it is possible to pressurize and spray the treated water stored straight without diffusing in the upper part of the tank.

  Here, the stirring and mixing in the tank will be described in detail based on the drawings. As shown in FIGS. 3 and 4, for example, the mixed fluid pressure-injected from the branch pipe 322 b connected to the upper surface 33 a of the processing tank 33 is vigorously sprayed to hot spring water that is a liquid phase accumulated in the tank. . The branch pipe 322 can be regarded as a mixed fluid injection pipe. The sprayed mixed fluid violently collides with the surface of the hot spring water. At the time of collision, the chance of contact between the air, which is a gas phase, in the upper space S of the processing tank 33 and the mixed fluid increases, and the air is mixed into the mixed fluid. Further, since the mixed fluid is pressurized by the branch pipe 322b and is guided and injected by the tip 332x of the branch pipe 322b, the mixed fluid reaches the inner bottom surface of the processing tank 33 as shown in FIG. Along the inner peripheral surface, the flow splits into two split flows L1 and L2 in opposite directions and rises. The ascending diversions L1 and L2 join the mixed fluid ML pressurized and injected from the branch pipe 322b, travel toward the bottom of the processing tank 33 again, and recirculate as shown in FIG. According to observation of an example described later, it was found that many bubbles in the mixed fluid ML circulate according to the flow shown in FIG. This bubble reflux is referred to herein as “bubble reflux”. In order to cause such bubble reflux, the inner surface of the tank is advantageously a curved surface, and the vertical cross section of the processing tank 33 is preferably a circle or an ellipse.

  In the processing tank 33 according to the present embodiment, it is necessary to maintain a gas phase and a liquid phase during the operation of the apparatus. It is known from the examples described later that it is effective to provide a gas phase having a height of 5% to 50% with respect to the height (inner diameter) of the treatment tank. From another viewpoint, when the distance from the tip of the branch pipe 322 functioning as the injection pipe to the liquid surface is L, for example, the gas phase is set so that −0.6 cm <L ≦ 6.3 cm. Can be maintained. When the distance L is smaller than −0.6 cm, that is, when the inside of the tank is almost only in the liquid phase, there is almost no oxygen dissolved from the gas phase to the liquid phase as will be described later, so the methane concentration is effectively reduced. It is not possible. On the other hand, the upper limit of the distance L also depends on the dimensions of the processing tank and the pressure of the gas phase, as will be described later. For example, the gas phase pressure in the processing tank 33 is increased by closing or narrowing the exhaust valve 34 of the processing tank.

  The pressure of the gas phase in the processing tank 33 can be controlled by adjusting the amount of gas discharged from the exhaust valve 34 (gas vent 342) and the flow rate of gas supplied by the air supply device 20. According to Henry's law, when a gas-liquid phase is present, the solubility of the gas in the liquid depends on the pressure of the gas, so by keeping the gas phase pressure relatively high, It is thought that the amount of dissolution increases. In particular, since the solubility of oxygen in water is about twice that of nitrogen in water, oxygen is preferentially dissolved in the treated water when the gas phase pressure is increased (oxygen is 0 at 1 atm and 20 ° C.). .0031 cm3, and nitrogen dissolves by 0.0016 cm3). As a result, it is considered that methane dissolved in the mixed fluid is replaced with oxygen and released into the gas phase. In the present invention, it has been found that methane in the source can be effectively reduced when the gas phase pressure is in the range of 0.12 to 0.18 MPa, for example.

  In order to adjust and maintain the height of the gas phase in the tank, the amount of air fed from the air feeding device 20, the flow rate of hot spring water fed from the water feeding device 10, and the drain pipe 332 are discharged. This can be realized by adjusting at least one of the flow rate of the liquid hot spring water and the flow rate of the gas discharged through the gas vent 342 (exhaust valve 34). The flow rate of these fluids (gas and liquid) is adjusted by means (flow rate adjustment means) such as the water supply device 10, the air supply device 20, and / or the flow rate adjustment valve 341 (exhaust valve 34). Can be adjusted. In the present invention, the case where the flow rate adjustment valve 341 of the exhaust valve 34 is completely closed is also included in “adjusting the exhaust amount of gas in the gas phase”. That is, the gas in the gas phase does not necessarily have to be exhausted from the exhaust valve 34.

  The flow rate of hot spring water varies depending on the source of the hot spring and the capacity of the liquid delivery device that delivers the source, but is, for example, 100 to 300 liters / minute, and the amount of air is, for example, 15 to 150 liters / minute. it can. In this embodiment, by adjusting the ratio of the flow rate of hot spring water supplied by the water supply device 10 and the amount of air supplied by the air supply device 20, that is, the mixing ratio, the liquid surface level from the tip of the branch pipe 322 is adjusted. The distance L (or the height of the gas phase) is maintained almost constant. The drain pipe 332 may be provided with a flow rate adjusting valve as part of the flow rate adjusting means. The mixing ratio of air to hot spring water can be in the range of 0.05 to 1, expressed as air volume (liter / minute) / hot spring water (liter / minute), preferably 0.1 to 0.8. is there. If the mixing ratio is less than 0.05, the removal efficiency of methane decreases, which is not preferable. On the other hand, if the mixing ratio exceeds 1, the amount of air increases and the amount of processing of the source decreases, which is not preferable.

  As shown in the conceptual diagram of FIG. 4, the mixed fluid ML pressurized and injected from the branch pipe 322 b also splits in the longitudinal direction of the tank, and then collides with the divided flow of the mixed fluid ML pressurized and injected from the adjacent branch pipe 322 c. Or rise while interfering. Then, when it reaches the vicinity of the water surface, it merges with the mixed fluid ML ejected from the discharge port of the branch pipe 322b, and begins to descend again toward the bottom surface of the processing tank 33. Due to the reflux generated in the longitudinal direction of the tank and the direction perpendicular thereto, air bubbles in the mixed fluid also generate bubble reflux, and contact with the hot spring water by being stirred and mixed with the hot spring water for a long time or repeatedly. Because it increases the opportunity to do so, it becomes easier to dissolve in hot spring water. As the air dissolves in the hot spring water, the dissolved methane gas is replaced and discharged. That is, in this invention, it is thought that there are two actions as a reason why methane in hot spring water can be effectively removed. One is the dissolution of air (especially oxygen) from the gas phase to the liquid phase due to the presence of the gas phase, and the other is the replacement of methane in the liquid phase with air (especially oxygen). The mixed fluid is ejected vigorously from the branch pipe 322b to reach the bottom of the processing tank 33, and bubble reflux is generated inside the processing tank 33, so that methane in the liquid phase is replaced with air (particularly oxygen). .

  Methane gas that has been discharged into bubbles rises in the hot spring water and accumulates in the upper space S (gas phase) of the treatment tank 33. Gases such as methane gas and air in the upper space S are dissipated from the gas vent 342 to the atmosphere via a flow rate adjusting valve 341 that limits the flow rate. Therefore, since the gas restricted by the flow rate adjusting valve 341 remains in the upper space S, it is possible to maintain the upper space S under a certain pressure.

  The mixed fluid (hot spring water) from which the methane gas has been degassed is discharged from a drain pipe 332 provided below the end of the treatment tank 33 in the longitudinal direction. Since the inside of the tank is under a constant pressure, hot spring water drains vigorously from the drain pipe 332. Therefore, the hot spring water fed by pressure from the drain pipe 332 can be delivered to the place where it is used without requiring a water feeding device such as a pump through other pipes.

  Thus, the liquid processing apparatus according to the present embodiment injects a mixed fluid (hot spring water in which air is mixed) into hot spring water containing methane gas in a treatment tank under pressure, instead of dissolved methane gas. Since the methane gas can be discharged by dissolving the air in the hot spring water, there is no need to reduce the pressure to remove the processing gas or to increase the pressure for delivery after the removal. With this, degassing gas can be removed.

  Moreover, the liquid processing apparatus which concerns on this embodiment has as a main structure the mixer 31 which mixes the hot spring water from the deaeration water supply apparatus 10, and the air from the air supply apparatus 20, and the hot spring water from the mixer 31. Since the branch pipe 32 to be distributed, the treatment tank 33 for stirring and mixing the hot spring water from the branch pipe 32, and the exhaust valve 34 for discharging the discharged methane gas, it is possible to reduce productivity and reduce running in a small installation space. Cost increase can be avoided as much as possible.

  Moreover, since the degassed hot spring water is discharged while the hot spring water is jetted into the treatment tank 33, the degassing process can be performed continuously, so that the dissolved gas is efficiently removed from the water to be treated. It is possible to improve productivity. Therefore, if the same amount of water to be treated is treated, the liquid treatment apparatus according to this embodiment can be configured in a compact manner. In addition, it turned out that the bubble reflux which arises in the processing tank 33 has the following incidental effects. That is, bubble reflux circulates in the processing tank 33. In particular, since the bubbles that recirculate in the circumferential direction of the treatment tank 33 recirculate along the inner peripheral wall of the treatment tank 33, solid contents such as hot water flowers and foreign substances are less likely to accumulate on the inner peripheral wall. Has a self-cleaning action. Therefore, clogging and failure of the processing tank 33 and piping equipment provided downstream thereof can be prevented, and the number of maintenance such as cleaning of the processing tank 33 can be reduced.

  Note that the liquid processing apparatus according to the embodiment can be automatically operated. When performing automatic operation, it is possible to provide a pressure switch that turns on when the hot spring water in the water supply pipe 12 reaches a predetermined pressure and starts the air supply device 20. This is because the hot spring water supplied by starting the water supply device 10 first flows into the bathtub B through the mixer 31 and the treatment tank 33, and a predetermined amount of hot spring water is stored in the bathtub B. Since the pressure of the hot spring water in the water supply pipe 12 increases, if the pressure of the hot spring water in the water supply pipe 12 is monitored, it is determined whether preparation for starting the air supply device 20 is completed. Because it can be done. Therefore, by providing a pressure switch for starting the air supply device 20 in the water supply pipe 12, it is possible to automatically start and stop the liquid processing device. Further, if a device that measures the flow rate of the water supply device 10 or the air supply device 20 and adjusts the flow rate is provided, stable operation can be performed, and a stable deaeration state (and the liquid phase from the tip of the branch pipe 322 can be obtained). The distance L to the liquid level, that is, a predetermined gas phase height) can be maintained. In this case, the flow rate of the air supply device 20 can be adjusted by providing an electric valve and a pressure regulating valve / flow rate valve between the air supply device 20 and the mixer 31. It functions as the flow rate adjusting means.

Second Embodiment A liquid processing apparatus according to a second embodiment of the present invention will be described with reference to the drawings. 5 to 7, the same components as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.

The liquid processing apparatus according to the second embodiment is characterized in that a plurality of processing units 30 including a processing tank 33 are provided and connected in series.
As shown in FIGS. 5 to 7, the liquid processing apparatus includes three processing units 30. Those processing units 30 are the first-stage processing unit 30 from the upstream side, the second-stage processing unit 30 located downstream thereof, and the third-stage (final) stage located downstream of the second-stage processing unit 30. Processing unit 30. Hereinafter, the first stage, the second stage, and the third stage are abbreviated as appropriate.

  The drain pipe 332a of the first stage treatment tank 33 is connected to the second stage water distribution pipe 334a located on the downstream side thereof, and is connected to the second stage mixer 31. Similarly, the drain pipe 332b of the second stage treatment tank 33 is connected to the third stage water distribution pipe 334b and is connected to the third stage mixer 31. A drain pipe 332c for discharging the degassed hot spring water is connected to the third-stage treatment tank 33. And the air supply pipe | tube 21 from the air supply apparatus 20 is arrange | positioned from the bottom in the side center part of each processing tank 30, and has branched to each mixer 31. FIG.

  Hot spring water from the water feeding device 10 flows to the mixer 31 of the first stage processing unit 30 and then flows to the processing tank 33 via the branch pipe 32. Next, the hot spring water from which the methane gas has been degassed in the treatment tank 33 is drained from the first-stage treatment tank 33 and flows to the second-stage mixer 31. Next, it flows from the second-stage mixer 31 to the second-stage treatment tank 33 through the branch pipe 32. Again, the remaining methane gas is degassed from the hot spring water and flows from the second stage treatment tank 33 to the third stage mixer 31. Then, it flows from the third-stage mixer 31 to the third-stage treatment tank 33 through the branch pipe 32, and the remaining methane gas is degassed from the hot spring water. Finally, it is delivered from the third-stage treatment tank 33 to the place where it is consumed from the drain pipe 332c. Methane gas discharged from the hot spring water is diffused into the atmosphere from each exhaust valve 34.

  In this way, the methane gas that remains without being removed by the first-stage processing unit 30 alone is degassed by the second-stage and third-stage processing units 30 connected in series. Residual concentration of methane gas dissolved in water can be suppressed below a specified value that can ensure safety.

  In addition, since each branch pipe of the air supply rod 21 for pressure-feeding air to the mixer 31 is provided with an adjustment valve 22 (pressure adjustment valve / flow valve), the amount of air to each mixer 31 can be reduced. Can be adjusted.

  In the second embodiment, the processing units 30 are connected in series, but may be connected in parallel if the amount of hot spring water treatment increases. When the processing units 30 are connected in parallel, one unit may be connected in parallel, or a plurality of units connected in series may be connected in parallel. Further, in the liquid processing apparatus shown in FIG. 5, the processing units 30 are arranged in the vertical direction downward, but may be arranged in the horizontal direction.

Moreover, the deaeration gas unit 30 can also be used by stopping the supply of air to the mixer 30 as necessary. For example, if the gas to be processed is sufficiently removed by the degassing process by the two processing units 30 in the first stage and the second stage, the pumping of air to the mixer 30 in the third stage is stopped. . By doing so, since the output of the air supply device 20 can be suppressed, an energy saving operation is possible. The liquid processing apparatus according to the second embodiment can also be set to automatic operation. When performing automatic operation, it is possible to provide a pressure switch that turns on when the hot spring water in the water supply pipe 12 reaches a predetermined pressure and starts the air supply device 20. By doing so, automatic starting and stopping are possible.
Further, if an electric valve and a pressure regulating valve / flow valve are provided to measure the flow rate of the water supply device 10 or the air supply device 20 and adjust the flow rate, the liquid treatment device according to the second embodiment is also stable. Operation can be performed and a stable deaeration state can be maintained.

Modification of Second Embodiment Next, a modification of the liquid processing apparatus according to the second embodiment of the present invention will be described with reference to FIG. In FIG. 8, the same components as those shown in FIG. In the modification of the liquid processing apparatus according to the second embodiment, the third-stage deaeration process is performed by connecting the discharge side and the water supply side of the third-stage deaeration unit with a circulation line and a circulation pump. It is characterized by circulating hot spring water in the unit.

  In the liquid processing apparatus shown in FIG. 8, an air treatment tank 35 is connected to a drain pipe 332 c of the third stage processing unit 30 with a water distribution pipe 351 interposed therebetween. The air treatment tank 35 is provided with an exhaust valve 352 for exhausting air mixed in a gaseous state without being dissolved in the hot spring water in the air treatment tank 35. The exhaust valve 352 is a flow rate adjustment valve 352a that restricts the flow rate of air, and is normally open, but when water enters the valve, the internal float rises and closes to restrict the discharge of water. A gas vent 352b is provided. The air treatment tank 35 is connected to a balance tank 36 with a communication pipe 361 interposed therebetween. A first circulation pipe 371 is connected to the balance tank 36, a circulation pump 37 is connected to the first circulation pipe 371, and a second circulation pipe 372 is connected to the circulation pump 37. The second circulation pipe 372 is connected to the mixer 31 of the third stage processing unit 30 through the water distribution pipe 334c together with the water distribution pipe 334b from the second stage processing tank 33.

  The liquid processing apparatus shown in FIG. 8 configured as described above has the same operation from the first stage to the second stage as the liquid processing apparatus shown in FIG. The hot spring water that has been processed and drained by the third-stage processing unit 30 is accumulated in the air processing tank 35. In the air treatment tank 35, air that is not dissolved but mixed in the form of bubbles is diffused from the gas vent 342 to the atmosphere via the flow rate adjustment valve 341. If the gas (air) is mixed with the liquid (hot spring water), the circulation pump 37 is in an idle state and may cause abnormal vibration, but the air treatment tank 35 discharges remaining bubbles without being dissolved in the hot spring water. Thus, stable pumping by the circulation pump 37 can be performed.

  Hot spring water from which air has been discharged in the air treatment tank 35 is accumulated in the balance tank 36. Once the hot spring water is stored in the balance tank 36, the hot spring water to be circulated to the third-stage treatment tank 33 is pumped from the balance tank 36 by the circulation pump 37. The hot spring water drained for use can be distributed in a well-balanced manner.

  The hot spring water pumped from the balance tank 36 is sent again to the third-stage mixer 31 by the circulation pump 37. And since the methane gas which is to-be-processed gas is discharged | emitted from hot spring water by performing deaeration process in the 3rd-stage processing tank 33, it remains without a removal partition only in the processing unit 30 connected in series. Even with such a high concentration of methane gas, by circulating the processing unit 30, the residual concentration of methane gas dissolved in the hot spring water can be suppressed to a specified value or less that can ensure safety.

  In the modification shown in FIG. 8, the circulation pump 37 is connected by the first circulation pipe 371 and the second circulation pipe 372 so that the hot spring water is circulated in the third stage processing unit 30. The processing unit 30 may be circulated from the processing unit 30 at the second stage to the processing unit 30 at the second stage, or from the processing unit 30 at the third stage to the processing unit 30 at the first stage. That is, the number of stages of the treatment unit 30 and the number of stages to be circulated can be appropriately determined according to the dissolved concentration of the gas to be treated of the hot spring water and the treatment capacity of the treatment tank 30. Moreover, the hot spring water may be circulated not only by circulating the processing units 30 connected in series but also by providing a circulation pump in the liquid processing apparatus according to the first embodiment (see FIG. 1). In this case, it is desirable to provide an air treatment tank 35 provided with an exhaust valve 352 and a balance tank 36 as in the liquid treatment apparatus shown in FIG.

  In the first and second embodiments, hot spring water has been described as an example of the liquid to be treated (treated water). However, the liquid is not limited to hot spring water, and water is mainly used (for example, 60%). Or more, preferably 85% or more), and includes tap water, seawater, river water, lake water, and the like. When these liquids are subjected to specific applications, it may be desirable to remove components such as dissolved gases contained in the liquid. For example, it is desirable to remove chlorine in order to use tap water as drinking water. Or it may be desirable to reduce dissolved oxygen from wine or other beverages, or to remove volatile carbon dioxide such as methane gas, sulfur-containing gas such as hydrogen sulfide or carbon monoxide from polluted or polluted lake water. is there. On the other hand, it may be desirable to increase dissolved oxygen when tap water is used for aquariums or bathtubs or when used in beverages.

  When removing chlorine from tap water, or when removing volatile carbon dioxide such as methane gas, sulfur-containing gas such as hydrogen sulfide, or carbon monoxide from polluted or contaminated lake water, it is mixed into the mixed fluid. The gas can be air or oxygen. By doing in this way, it is possible to increase dissolved oxygen. Moreover, when reducing dissolved oxygen from drinks, such as wine, it can be set as the gas which mixes inert gas, such as nitrogen, and a carbon dioxide (for example, lotion use) into a mixed fluid. As described above, the present invention can be used not only for removing a specific component contained in a liquid but also for adding or enriching another gas component.

  Moreover, although the cylindrical thing was used as the processing tank 33 in 1st and 2nd embodiment, the thing of another shape is also employable. However, in order to effectively exchange the gas to be treated (methane gas) and degassed gas (air), when the hot spring water sprayed from the top advances to the bottom of the tank, each other along the inner peripheral surface It is necessary to efficiently carry out the collision with the flow of hot spring water that has been diverted in the reverse direction and then raised and pressurized. Accordingly, the processing tank 33 can have an elliptical shape whose vertical cross section is the long side direction in the up-down direction, a polygon more than a triangle whose corners are directed downward, or an irregular shape similar to these.

Example 1
The methane gas was degassed from the hot spring water using the liquid processing apparatus according to the second embodiment shown in FIG. In addition, the material of the branch pipe 32 and the processing tank 33 used stainless steel (SUS150A). The main pipe 321 of the branch pipe 32 has an inner diameter of about 5 cm and a length of about 78 cm. The branch pipe 322 has an inner diameter of about 2.5 cm and a length of about 20 cm. The first branch pipe 322d (see FIG. 1) is provided in the main pipe 321 at a distance of about 12 cm from the mixer 31, and the other branch pipes 322c to 322a are provided at intervals of about 18 cm. The distal end 322x of the branch pipe 322 protrudes about 12.5 mm into the processing tank 33.
The treatment tank 33 has a cylindrical shape with an inner diameter of about 15 cm (actual measurement: 158.4 mm) and a length of about 80 cm, and an exhaust pipe 33 of about 25 mmφ is laid on the upper part of the end. To the upper space S. In the mixer 31, the inner diameter of the inner tube 31a is about 1.5 cm, and the inner diameter of the outer tube 31b is about 6.5 cm. For the first nozzle 31c of the mixer 31, a tank mixing eductor manufactured by Spraying Systems Japan Co., Ltd. was used. In addition, the distance L from the tip of the branch pipe 322 to the liquid surface was adjusted to 2.4 cm. In addition, the dimension of the branch pipe 32 and the processing tank 33 can be changed according to a processing capacity.

In Example 1, 24% LEL hot spring water from a source located in Miyano, Yame city, Fukuoka Prefecture was degassed.
Here, “% LEL” indicating the concentration of combustible gas (methane gas) is the lower explosion limit value of combustible gas (concentration at which methane gas starts to explode. In the case of methane gas, 5% by volume (50,000 ppm)) is 100. It is the ratio of the gas concentration when The measurement of the concentration of methane gas was performed in accordance with the combustible gas measurement method (head space method) in the hot spring method using a catalytic combustion type gas sensor combined gas detector Cosmo Detector XP-3118S.
In the deaeration process, first, air was pumped to the mixer 31 at a pressure of 0.35 MPa by the gas feeding device 10. Moreover, hot spring water was pumped to the mixer 31 at a pressure of 0.26 MPa and a water volume of 240 L / min.

When hot spring water is supplied by the water supply device 20 and air is supplied by the air supply device 10 in this way, the gas concentration of methane gas exhausted from the exhaust valve 34 of the first stage processing unit 30 is 55% LEL. It was. The gas concentration of methane gas exhausted from the exhaust valve 34 of the second stage processing unit 30 was 33% LEL. Furthermore, the gas concentration of the methane gas exhausted from the exhaust valve 34 of the third stage processing unit 30 was 12% LEL. The gas concentration measurement of the exhaust valve performed here was measured using a methane gas measuring device (contact combustion gas sensor combined gas detector Cosmo Detector XP-3118S) at the outlet of the exhaust valve.
Further, the methane gas concentration of the final third-stage treated water was 3.0% LEL as a result of the headspace method, and the target methane gas concentration was 5.0% LEL or less. .
As will be understood from the above, methane gas is degassed from the hot spring water step by step by performing the deaeration process in the processing tank 33 of the processing unit 30 of the first stage, the second stage, the second stage, and the third stage. It can be seen that the concentration is low.

Example 2
In Example 2, the liquid processing apparatus according to the second embodiment shown in FIG. 5 used in Example 1 was used. Then, 8% LEL hot spring water from the source of Harazuru Onsen, Asakura City, Fukuoka Prefecture was degassed. First, air was pumped to the mixer 31 by the air feeding device 10 at an air volume of 160 m ^{3 /} h and a pressure of 0.35 MPa. Moreover, the hot spring water was pumped to the mixer 31 at a pressure of 0.11 MPa and a water volume of 253 L per minute by the water feeder 20. As a result, the methane gas concentration of the treated water in the final third stage degassing treatment unit was 3.7% LEL, and the target methane gas concentration was 5.0% LEL or less.

Example 3
Also in Example 3, the liquid processing apparatus according to the second embodiment shown in FIG. 5 used in Example 1 was used. And the air volume of the air supplied by the air supply device 10 is 240 m ³ / h, the pressure is 0.35 MPa, the pressure of the hot spring water supplied by the water supply device 20 is 0.11 MPa, the flow rate is 253 L / min, The amount of exhaust gas was adjusted accordingly. In this state, 8% LEL hot spring water from the source of the Harazuru hot spring was degassed in the same manner as in Example 1. The methane gas concentration of the treated water from the final (third stage) deaeration unit was measured and found to be 0.1% LEL or less, which is the measurement limit.

Example 4
In Example 4, tap water was treated using the liquid treatment apparatus according to the second embodiment shown in FIG. The chlorine concentration in tap water was 0.24 ppm, and the oxygen concentration was 11.8 ppm. The air feeding device 10 pumped air to the mixer 31 at a pressure of 0.4 MPa, and the water feeding device 20 pumped tap water to the mixer 31 at a pressure of 0.1 MPa and a water volume of 200 L / min. The chlorine concentration of the treated water from the final treatment unit 30 was 0.00% ppm (less than the measurement limit value), and the oxygen concentration was 15.2 ppm. From this result, it can be seen that the chlorine concentration in water can be reduced and the dissolved amount of oxygen can be increased by using the liquid treatment apparatus of the present invention. In other words, the liquid treatment apparatus of the present invention removes dissolved specific components such as methane gas in hot spring raw water and chlorine in tap water, and dissolves other beneficial gas components in the water to be treated. It can be made. According to the results of Example 4, the liquid treatment apparatus of the present invention can be used as a water purifier or provided as bathing water for atopic patients or the like by being connected to a water pipe. .

  In this example, the following experiment was also conducted as a treatment of tap water. For the same tap water (oxygen concentration is 11.8 ppm), nitrogen is pumped to the mixer 31 at a pressure of 0.4 MPa instead of air by the air feeding device 10, and tap water is fed at a pressure of 0.1 MPa by the water feeding device 20. It was pumped to the mixer 31 with an amount of water of 200 L / min. As a result, the oxygen concentration of the treated water from the final treatment unit 30 was reduced to 2.6 ppm. From this, it can be seen that various gases such as nitrogen can be used for the mixed fluid to replace the gas component dissolved in the water to be treated.

Example 5
In Example 5, a cylindrical treatment tank made of acrylic whose inside can be observed was produced as the treatment tank 33 shown in FIG. The results are shown in FIGS. As can be seen from the photographs shown in FIGS. 9 and 10, it was confirmed visually that the bubbles in the mixed fluid had reached the bottom of the treatment tank 33. It was clarified in a test using a treatment tank made of acrylic that such refluxing occurred also in the longitudinal direction of the treatment tank.

Example 6
In Example 6, while changing the distance L from the tip of the branch pipe 322 to the liquid surface, the bubbles generated in the tank were observed, and the oxygen concentration in the hot spring water discharged from the treatment tank 33 was measured. As a result, when the distance L is larger than 0 cm and 6.3 cm or less, that is, the height of the gas phase is 9.1 mm to 71.1 mm (5.1% to 46.8% with respect to the diameter of the treatment tank). ), It was confirmed that many bubbles were generated in the tank. Moreover, the oxygen concentration in the hot spring water discharged from the drain pipe 332 was high. When the distance L was zero, that is, when the inside of the tank was only in the liquid phase, a large amount of bubbles as in the photograph shown in FIG. 9 was not observed.

Example 7
In this embodiment, how to change the concentration of methane gas and the dissolved oxygen concentration in the treated water by changing the amount of air sent from the air supply device 10 using the liquid processing device used in Example 1 is as follows. The conditions were investigated. As the water to be treated, the source of Harazuru Onsen, Asakura City, Fukuoka Prefecture was used. The methane concentration of Harazumi collected at the time of the experiment was 12% LEL. In addition, the pressure tank was attached to the waste water side of the liquid processing apparatus, and the pressure difference between the input side and the output side of the water to be treated was adjusted. The supply water pressure and supply water amount of the water supply device are about 0.18 MPa and 253 L / min, the air pressure of the air supply device is 0.26 MPa, and the air flow rate is 0, 20, 40, 60, 80 and The methane concentration and dissolved oxygen concentration of the treated water when changing stepwise to 100 liters / minute were measured. The pressure in the pressure tank was 0.14 MPa. The two exhaust valves 34 are both open (fully open). Further, the pressure of the gas phase formed in the first stage treatment tank 33 when the deaeration process is performed at each air flow rate is measured with a pressure gauge attached in the vicinity of the exhaust valve 34, and the gas phase The height (width) in the treatment tank 33 was measured through the acrylic end face of the treatment tank 33. However, since the “height of the gas phase” in the table is a value obtained by measuring the distance to the liquid surface on the basis of the outer diameter of the tank, the thickness of the tank is actually 3.4 mm from the value in the table. The subtracted value represents the height of the gas phase. The oxidation-reduction potential was measured with an oxidation-reduction potentiometer (Sato Corporation YK-23RP). The results are shown in the table of FIG. In this table, the actual values of the air flow rate of the first-stage treatment tank and the air pressure of the air supply device are listed in the “first tank insertion amount” column. The first and second stage treatment tanks are also described in the “second tank insertion amount” and “third tank insertion amount” columns. Further, the liquid phase pressures in the first to third stage treatment tanks are shown in the columns of “first tank pressure”, “second tank pressure”, and “third tank pressure”.

  Moreover, based on the result of the table | surface of FIG. 13, the change of the methane density | concentration of the treated water with respect to the air quantity and the dissolved oxygen concentration was shown on the graph of FIG. The vertical axis of the graph represents both the methane concentration (% LEL) and the oxygen concentration (mg / L). This graph shows that the concentration of methane in the treated water decreases as the amount of air mixed into the source increases. On the contrary, it can be seen that the amount of dissolved oxygen in the treated water increases as the amount of air mixed into the source increases. Even if the supply air amount is zero, the methane concentration in the treated water (8.5% LEL) is lower than the methane concentration in the source water (12% LEL). It can be seen that 5% LEL or less is achieved. Further, the height of the gas phase in the treatment tank 33 increases as the amount of air introduced increases. It can be seen that there is a gas phase (71.6 mm) that is 45.2% of the inner diameter of the treatment tank at the maximum. This is considered to be because the gas phase pressure in the processing tank 33 increased with the increase in the amount of air. Actually, the pressure in the gas phase measured in the vicinity of the exhaust valve 34 increases with the air flow rate. Note that the oxidation-reduction potential increases as the air introduction amount increases. This is consistent with an increase in the amount of dissolved oxygen.

Example 8
The source water used in Example 7 was degassed under the same conditions as in Example 7 except that one of the two exhaust valves 34 was closed (half-opened state). The results are shown in the table of FIG. In this table, the setting of the air flow rate of the first to third stage treatment tanks is changed from the initial value (0, 20, 40, 60, 80 and 100 liters L / min) of Example 7. However, the actual value varies somewhat from the initial value due to one-side closing of the exhaust valve 34 or the like. The same applies to the air pressure. Based on the results in the table of FIG. 13, changes in the methane concentration and dissolved oxygen concentration of the treated water with respect to the amount of air are shown in the graph of FIG. The vertical axis of the graph represents both the methane concentration (% LEL) and the oxygen concentration (mg / L). From the graph of FIG. 12, the concentration of methane in the treated water decreases as the amount of air mixed in the source increases as in the result of Example 7. On the contrary, it can be seen that the amount of dissolved oxygen in the treated water increases as the amount of air mixed into the source increases. Also in this example, the oxidation-reduction potential increases with an increase in the amount of air introduced, which is consistent with an increase in the amount of dissolved oxygen.

Example 9
The source water used in Example 7 was deaerated under the same conditions as in Example 7 except that both of the two exhaust valves 34 were closed (fully closed state). The results are shown in the table of FIG. In this table, the setting of the air flow rate of the first to third stage treatment tanks is changed from the initial value (0, 20, 40, 60, 80 and 100 liters L / min) of Example 7. However, the actual value varies somewhat from the initial value due to closing of the exhaust valve 34 or the like. The same applies to the air pressure. From the results in Table 1, as the amount of methane in the treated water decreases as the amount of air in the range of 0 to 80 liters / minute increases, the amount of dissolved oxygen in the treated water increases as the amount of air mixed into the source increases. ing. Also in this example, the oxidation-reduction potential increases with an increase in the amount of air introduced, which is consistent with an increase in the amount of dissolved oxygen.

この実験では、導入する空気量を一定にしつつも排気バルブの開放量を変化させることにより、気相の圧力の変化の影響を観察することができる。表１の結果からすれば、排気バルブを全開から全閉にすると、気相の気体の排気量が絞られて、気相の圧力が高くなるとともに気相の高さも高くなっていることが分かる。また、この気相の圧力の上昇に伴って処理水中のメタンが減少し、溶存酸素が増加している。この結果からすれば、処理水中のメタン濃度及び溶存酸素濃度は処理槽３３内の気相の圧力に依存していることが分かる。このことは気体の溶存量が気体の圧力に依存するとするヘンリーの法則にも合致している。 Example 10
In this example, in order to investigate the change of the methane concentration and dissolved oxygen concentration in the treated water with respect to the pressure of the gas phase in the treatment tank 33 using the liquid treatment apparatus used in Example 1, the air flow rate was set to 100 L / min. The deaeration process was performed by changing the degree of opening of the exhaust valve 34 stepwise. As the water to be treated, the source of the Harazuru hot spring was used as in Examples 7 to 9, but the methane concentration of the source water collected during the experiment was 9.3% LEL, and the supply water pressure and the supply water amount of the water supply device were Respectively about 0.18 to 0.195 MPa and 253 L / min, the air pressure of the air feeding device was 0.33 MPa in the first to third stage treatment tanks, and the pressure in the pressure raising tank was 0.13 MPa. The degree of opening of the exhaust valve 34 was processed in a state where two exhaust valves were opened (fully opened), only one was opened (half-opened), and both were closed (fully closed). The methane concentration and dissolved oxygen concentration of the treated water in these cases were measured and shown in Table 1 below together with the pressure and height of the gas phase in the first treatment tank 33.

In this experiment, it is possible to observe the influence of the change in the pressure of the gas phase by changing the opening amount of the exhaust valve while keeping the amount of air introduced constant. From the results in Table 1, it can be seen that when the exhaust valve is fully opened to fully closed, the amount of gas phase gas exhausted is reduced, and the gas phase pressure increases and the gas phase height increases. . In addition, as the pressure in the gas phase increases, methane in the treated water decreases and dissolved oxygen increases. From this result, it can be seen that the methane concentration and dissolved oxygen concentration in the treated water depend on the pressure of the gas phase in the treatment tank 33. This is consistent with Henry's law that the amount of dissolved gas depends on the pressure of the gas.

Example 11
In this embodiment, in order to investigate the change in the methane concentration and dissolved oxygen concentration in the treated water with respect to the gas phase pressure when the pressure of the gas phase in the treatment tank 33 is lowered as compared with Example 10, the air flow rate is set to 100L. The water pressure of the water feeding device and the amount of water supplied were reduced to about 0.155 MPa and 253 L / min, the air pressure of the air feeding device was reduced to 0.2 MPa, and the pressure of the pressure tank was reduced to 0.1 MPa. The source water of Harazuru Onsen was used as the water to be treated in the same manner as in Examples 7 to 9, but the methane concentration of the source water collected during the experiment was 11% LEL. In the same manner as in Example 10, the degree of opening of the exhaust valve 34 was set such that two exhaust valves were opened (fully opened), only one was opened (half-opened), and both were closed (fully closed). The methane concentration and dissolved oxygen concentration of the treated water in these cases were measured and shown in Table 2 below together with the pressure and height of the gas phase in the first stage treatment tank 33.

  According to the results in Table 2, the methane concentration is reduced even when the pressure in the gas phase is lower than that in Example 10, and the methane in the treated water is further reduced as the pressure in the gas phase is increased. It can be seen that dissolved oxygen increases.

Example 12
In this example, the processing was performed by changing the air flow rate of 100 L / min in the first to third stage treatment tanks in Example 11 to 50 L / min. As the treated water, the methane concentration of the source water of the Harazuru Onsen used was 11% LEL as in Example 11, the supply water pressure and supply water amount of the water supply device were about 0.15 MPa and 253 L / min, respectively. The air pressure of the apparatus was 0.2 MPa, and the pressure of the pressure tank was 0.1 MPa. In order to switch the degree of opening of the exhaust valve 34 to four stages, two exhaust valves 34 are added, all four exhaust valves 34 are opened (fully opened), only two are opened (half-open), and only one is opened. (1/4 open), each was processed in the state of closing (all closed). The methane concentration and dissolved oxygen concentration of the treated water in these cases were measured, and are shown in Table 3 below together with the pressure and height of the gas phase in the first treatment tank 33.

  According to the results in Table 3, no change in the pressure of the gas phase is observed even when the exhaust valve is in a fully open state to a half open state. It can be seen that the height of is also high. In addition, as the pressure in the gas phase increases, methane in the treated water decreases and dissolved oxygen increases. This result also shows that the methane concentration and dissolved oxygen concentration in the treated water depend on the gas phase pressure in the treatment tank. Even when the gas phase pressure is reduced to about 0.12 MPa, methane is effectively removed from the source. That is, it can be seen that the gas phase pressure in the treatment tank is 0.12 or more and methane can be well removed from the source in the range of 0.12 to 0.18 Mpa through the above examples.

Example 13
In this example, how the content of radon, which is a hot spring component for methane and oxygen dissolved in the treated water, changes when the amount of air sent from the air supply device 10 is changed as in Examples 7-9. We investigated what to do. As the water to be treated, a source of Harazuru Onsen, Asakura City, Fukuoka Prefecture was used as in Examples 7-10. The source methane concentration was 13% LEL, radon content was 4.6 Ci / kg × 10 −10, and oxygen was 1.8 mg / L. First, when the air amount of the air supply device 10 was adjusted so that the target concentration of methane in the treated water was about 5% LEL, the air amount of the first treatment tank was 10 liters / minute (second step). The concentration of methane in the treated water was 4.6% LEL at 10 liters in the first treatment tank and 0 liters in the third treatment tank. At this time, the supply water pressure and the supply water amount of the water supply device were about 0.16 MPa and 253 L / min, the air pressure of the air supply device was 0.26 MPa, and the pressure of the pressure tank was 0.12 MPa. The radon in the treated water under these conditions was 4.5 Ci / kg × 10 −10 which was almost the same as the source, and the oxygen was 4.6 mg / L. The measurement of radon, methane and dissolved oxygen concentrations in the source and treated water in this example is the result of a survey by the Kyushu Environmental Management Association.

  Next, when the air amount of the air supply device 10 was adjusted so that the target concentration of methane in the treated water was approximately 2.5% LEL, the air amount to the first stage treatment tank was 80 liters / minute ( The concentration of methane in the treated water was 2.5% LEL in the second-stage treatment tank having an air volume of 90 liters and the third-stage treatment tank having an air volume of 55 liters). At this time, the supply water pressure and the supply water amount of the water supply device were about 0.16 MPa and 253 L / min, the air pressure of the air supply device was 0.26 MPa, and the pressure of the pressure tank was 0.125 MPa. The radon in the treated water under these conditions was 2.4 Ci / kg × 10 −10 and oxygen was 8.3 mg / L.

  Further, when the air amount of the air supply device 10 is adjusted so that the target concentration of methane in the treated water is about 0.7% LEL, the air amount of the first stage treatment tank is 190 liters / minute (second The methane concentration in the treated water was 0.6% LEL in the 200 liter air volume in the stage treatment tank and the 60 liter air quantity in the third stage treatment tank). At this time, the supply water pressure and the supply water amount of the water supply device were about 0.16 MPa and 253 L / min, the air pressure of the air supply device was 0.26 MPa, and the pressure of the pressure tank was 0.13 MPa. The radon in the treated water under these conditions was 0.6 Ci / kg × 10 −10 and oxygen was 9.6 mg / L.

  From the results of this example, it is possible to reduce the methane concentration in the treated water and increase the oxygen by appropriately mixing air into the mixed fluid, but on the other hand, if the amount of air is too large, the active ingredient in the hot spring water It can be seen that radon is reduced. In this example, it can be seen that if methane is kept at 4.6% LEL, which is 5% LEL or less of the regulated value, the content of radon is also maintained at the same level as the source. Although the gas phase pressure in the treatment tank was not measured in this example, it is clear from the results of Examples 7 to 10 that the gas phase pressure increases as the amount of air increases. Therefore, it is effective to control the pressure of the gas phase within an appropriate range for the adjustment of hot spring components such as radon in the source spring.

  As described above, the treatment apparatus and the treatment method of the present invention mix the gas while flowing the water to be treated to form a mixed fluid, and the gas in the treatment tank in a sealed state while flowing the mixed fluid. Is dissolved in the treated water and degassed, and finally discharged as treated water. Therefore, since it can process continuously as it is, without stopping the to-be-processed water which springs out, such as a hot spring, it can process with high efficiency. On the other hand, a large-capacity tank or bath for storing the liquid to be processed for processing is unnecessary, so that the apparatus itself becomes compact. Therefore, the processing apparatus of the present invention can realize space saving and reduce the manufacturing cost. The treated water that has been treated is treated (processed) homogeneously, that is, so that the dissolved components have the same concentration, and thus is useful for various applications.

  The processing apparatus and processing method of the present invention can be considered for a wide range of uses and application examples as follows. For example, in agriculture, utilization of water is indispensable, but in hydroponics (liquid fertilizer) cultivation, the amount of dissolved oxygen in the water used, sterilization, and fertilizer injection are important. The processing apparatus of the present invention can meet these demands. For example, by using air and ozone as the gas constituting the mixed fluid, sterilization of the used water can be performed while flowing. Moreover, fertilizers, such as liquid manure, can be mixed in the mixed fluid by dissolving in water constituting the mixed fluid. In this case, an additive inlet such as a fertilizer can be provided in the mixer for generating the mixed fluid, and not only liquid fertilizer but also powder can be introduced. Of course, it is possible to dissolve oxygen as in the above-described embodiment, and the water (liquid) discharged from the treatment apparatus can maintain the oxygen dissolved amount at a certain level or more, and the water having a uniform oxygen concentration ( Liquid) can be supplied to the planter. In particular, it is possible to prevent poor growth due to oxygen deficiency in the middle of hydroponic (liquid fertilizer) cultivation planters.

  Moreover, this processing apparatus can be utilized also in the fishery field. For the growth of fish, the amount of oxygen contained in water is important, but as shown in the above embodiment, treated water containing a constant amount of dissolved oxygen by always injecting air as the gas of the mixed fluid ( For example, seawater) can be supplied. Since the processing capacity of the device can be changed freely depending on the size of the processing tank and the performance of the water supply device, it can be scaled up to suit the application from car transport to large fish tanks. In addition, as in agricultural applications, water such as ozone can be mixed in the mixed fluid to sterilize water or add insufficient oxygen. In addition, since the processing liquid can be continuously discharged (supplied) by the continuous processing, it can be supplied in the form of a water flow from the discharge side of the apparatus, and can be used for growing fish storage that requires the water flow. In particular, while detecting the amount of dissolved oxygen in the water tank, the water in the water tank is supplied to the mixer of the present processing apparatus to circulate the treated water between the water tank and the present processing apparatus based on the detected dissolved oxygen amount. By adjusting the gas phase pressure of the treatment tank, the dissolved oxygen concentration in the water tank can always be controlled to a predetermined value. Thus, the present invention can also provide a system for automatically operating the present processing apparatus in combination with the dissolved oxygen detector and the control apparatus.

  Since the present processing apparatus can degas methane gas as described above, it is also useful for sewage treatment, in particular, removal of recovered sewage and methane gas generated in the treatment process. In addition, since this treatment device is a closed system, gas can be collected through the exhaust gas valve, and the odor of the drainage discharged from sewage and waste treatment facilities is not leaked to the outside, reducing the environmental burden. Can do. Moreover, since this processing apparatus performs processing continuously while flowing the liquid to be processed, it is possible to collect methane gas or the like that is constantly generated therefrom and reuse it as an energy resource. In this case, the exhaust gas valve connected to the treatment tank of the present processing apparatus can be connected to a methane recovery cylinder or a power generation apparatus through a gas pipe or the like.

  The present invention is suitable when the treated water is used in the industry, agriculture, fishery industry, service industry, general life, because the treated gas is dissolved and there is a problem in use, It is particularly suitable for removing dissolved methane gas from hot spring water. Further, the present invention can be used not only for removal of specific components contained in water-based liquids but also for addition and enrichment of other gas components, so that the quality of bath water, lotion, and beverages can be improved. It is also effective for environmental preservation such as preservation and improvement of river and lake water. In addition, a wide range of applications are expected in the fields of agriculture, sewage treatment, and fisheries.

DESCRIPTION OF SYMBOLS 10 Water supply apparatus 11 Water distribution pipe 12 Water supply pipe 20 Air supply apparatus 21 Air supply pipe 22 Flow control valve 30 Deaeration processing unit 31 Mixer 31a Inner pipe 31b Outer pipe 31c First nozzle 31d Internal flow path 31e Discharge port 311 Base end part 312 Body portion 313 Tip portion 32 Branch pipe 321 Main pipe 322, 322a to 322d Branch pipe (injection pipe)
322x tip 33 treatment tank 33a upper surface 33b one end surface 33c other end surface 331 pressure gauge 332a to 332c drainage pipe 333 exhaust pipe 334a to 334c water distribution pipe 34 exhaust valve 341 flow rate adjustment valve 342 gas vent 35 air treatment tank 352 water distribution pipe 352 Flow adjustment valve 352b Gas vent 36 Balance tank 361 Communication pipe 37 Circulation pump 371 First circulation pipe 372 First circulation pipe B Bathtub ML Mixed fluid L1, L2 Reflux L Distance from the injection pipe to the liquid surface

According to the first aspect of the present invention, there is provided a processing apparatus for processing while flowing a liquid mainly composed of water as water to be treated,
A sealed treatment tank in which a gas phase and a liquid phase coexist;
An injection pipe that is connected to the upper end of the processing tank and continuously injects a mixed fluid obtained by mixing a gas into the liquid from the front end to the liquid phase through the gas phase in the processing tank;
A discharge port provided in the processing tank, for continuously discharging the liquid phase liquid from the processing tank;
An exhaust port provided in the processing tank and exhausting the gas in the gas phase from the processing tank;
The height of the gas phase in the treatment tank is substantially constant by adjusting the flow rate of at least one of the gas and liquid constituting the mixed fluid, the liquid discharged from the discharge port, and the gas discharged from the exhaust port. Bei example a flow rate adjusting means for maintaining a,
The treatment tank is a horizontally placed cylindrical container, and the injection pipe has a plurality of injection units arranged at predetermined intervals along the central axis of the treatment tank, and a mixed fluid from the injection unit Is arranged so that the injection direction of the nozzle is orthogonal to the central axis of the treatment tank and toward the central axis of the treatment tank,
The liquid processing apparatus is characterized in that the jetting pipe jets the mixed fluid from the jetting pipe so that bubbles in the jetted mixed fluid reach the bottom of the processing tank .

According to the second aspect of the present invention, there is provided a processing method for processing while flowing a liquid mainly composed of water as water to be treated,
Mixing a gas with the liquid to form a mixed fluid;
Continuously injecting the mixed fluid into the liquid phase via the gas phase in the processing tank from an injection pipe connected to an upper part of a closed processing tank in which the gas phase and the liquid phase coexist. ,
Continuously discharging the liquid phase liquid in the treatment tank;
Adjusting the displacement of the gas in the gas phase of the treatment tank;
The gas phase in the processing tank is adjusted by adjusting at least one flow rate of the gas and liquid constituting the mixed fluid, the liquid phase liquid discharged from the processing tank, and the gas phase gas exhausted from the processing tank. look including to maintain of a height substantially constant,
The treatment tank is a horizontally placed cylindrical container, and the injection pipe has a plurality of injection units arranged at predetermined intervals along the central axis of the treatment tank,
From the jet pipe, the mixed fluid from the jetting unit is directed to the central axis of the processing tank so as to be orthogonal to the central axis of the processing tank, and the bubbles in the mixed fluid reach the bottom of the processing tank. There is provided a liquid processing method characterized by ejecting a mixed fluid .

Te liquid processing apparatus and liquid processing method odor of the present invention, the pre-Symbol treatment tank, it is seen that the injected fluid mixture refluxed along the inner circumferential wall of the container. Further, the spray pipe may be connected to the upper part of the processing tank such that the tip of the spray pipe protrudes from the upper part of the processing tank into the tank. Further, the spray pipe may be composed of a plurality of branch pipes arranged in parallel at a predetermined distance from each other, and each branch pipe may be connected to the upper part of the processing tank so as to be orthogonal to the upper surface of the processing tank.

Claims (18)

A treatment apparatus for treating a liquid mainly composed of water as water to be treated,
A sealed treatment tank in which a gas phase and a liquid phase coexist;
An injection pipe that is connected to the upper end of the processing tank and continuously injects a mixed fluid obtained by mixing a gas into the liquid from the front end to the liquid phase through the gas phase in the processing tank;
A discharge port provided in the processing tank, for continuously discharging the liquid phase liquid from the processing tank;
An exhaust port provided in the processing tank and exhausting the gas in the gas phase from the processing tank;
The height of the gas phase in the treatment tank is substantially constant by adjusting the flow rate of at least one of the gas and liquid constituting the mixed fluid, the liquid discharged from the discharge port, and the gas discharged from the exhaust port. And a flow rate adjusting means for maintaining the liquid processing apparatus.   Furthermore, a mixer for forming a mixed fluid to the ejection pipe is provided, and the mixer has a flow path through which the liquid flows and a nozzle that is accommodated in the flow path and ejects gas into the liquid. The liquid processing apparatus according to claim 1, further comprising:   The treatment tank is a horizontally placed cylindrical container, and the injection pipe has a plurality of injection units arranged at predetermined intervals along the central axis of the treatment tank, and a mixed fluid from the injection unit The liquid processing apparatus according to claim 1, wherein the spraying direction of the liquid is arranged so as to be orthogonal to the central axis of the processing tank and toward the central axis of the processing tank.   4. The liquid processing apparatus according to claim 1, wherein the ejection pipe ejects the mixed fluid from the ejection pipe so that bubbles in the ejected mixed fluid reach a bottom of the processing tank. 5. .   The liquid processing apparatus according to claim 3, wherein the jetted mixed fluid flows back along the inner peripheral wall of the container.   The liquid processing apparatus according to any one of claims 1 to 5, wherein the spray pipe is connected to an upper portion of the processing tank such that a tip of the spray pipe protrudes from the upper portion of the processing tank into the tank.   The said injection pipe consists of a some branch pipe paralleled at predetermined distance mutually, Each branch pipe is connected with the upper part of the process tank so that it may orthogonally cross the said process tank upper surface. A liquid processing apparatus according to 1.   The liquid processing apparatus according to any one of claims 1 to 7, wherein a pressure of the gas phase is adjusted to 0.12 MPa to 0.18 MPa.   The liquid processing apparatus according to any one of claims 1 to 8, wherein an exhaust valve that adjusts a gas phase pressure by adjusting an opening degree of the exhaust port is provided at the exhaust port. .   10. The process according to claim 1, wherein the water to be treated is hot spring water, the gas is air, and methane contained in the hot spring water is removed by passing the mixed fluid through the treatment tank. A liquid processing apparatus according to claim 1.   11. The liquid processing apparatus according to claim 1, wherein a plurality of the liquid processing apparatuses are connected in series, and the liquid discharged from the upstream liquid processing apparatus is introduced into the downstream liquid processing apparatus after being mixed with gas. The liquid processing apparatus according to one item. A treatment method for treating a liquid mainly composed of water as water to be treated,
Mixing a gas with the liquid to form a mixed fluid;
Continuously injecting the mixed fluid into the liquid phase via the gas phase in the processing tank from an injection pipe connected to an upper part of a closed processing tank in which the gas phase and the liquid phase coexist. ,
Continuously discharging the liquid phase liquid in the treatment tank;
Adjusting the displacement of the gas in the gas phase of the treatment tank;
The gas phase in the processing tank is adjusted by adjusting at least one flow rate of the gas and liquid constituting the mixed fluid, the liquid phase liquid discharged from the processing tank, and the gas phase gas exhausted from the processing tank. A liquid processing method comprising maintaining the height of the liquid substantially constant.   The liquid processing method according to claim 12, wherein the mixed fluid is ejected from the ejection pipe such that bubbles in the mixed fluid ejected from the ejection pipe to the processing tank reach the bottom of the processing tank.   The liquid processing method according to claim 12 or 13, wherein the height of the gas phase in the processing tank is maintained at 5 to 50% of the height inside the processing tank.   13. The treated water is hot spring water, the gas mixed in the mixed fluid is air, and methane contained in the hot spring water is removed by being treated in the treatment tank. The liquid processing method as described in any one of 1 to 14.   The liquid treatment method according to any one of claims 12 to 14, wherein the treated water is sewage, and methane contained in the sewage is removed by being treated in the treatment tank.   The water to be treated is water for agriculture or fishery, the gas is air, and the liquid treated in the treatment tank is enriched with oxygen. The liquid processing method as described in any one of. The liquid processing method according to any one of claims 12 to 17, wherein the pressure of the gas phase is adjusted to 0.12 MPa to 0.18 MPa.

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