JPS6323995Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an apparatus for removing carbon dioxide from water, which is carried out as a pre-treatment, mainly for the purpose of converting tap water into drinkable water by electrolysis or electroosmosis. It is related to.

Generally, groundwater and river water contain a large amount of carbonic acid called free carbonate. The origin of this carbonic acid is mostly carbon dioxide gas dissolved in rainwater, but it is also carbon dioxide gas generated in the soil by the respiration of living organisms and the decomposition of bacteria. The relationship between dissolution and dissociation of carbon dioxide gas is CO ₂ + H ₂ OH ₂ CO ₃ (carbonic acid) H ₂ CO ₃ H ⁺ + HCO ₃ ^- HCO ₃ ^- H ⁺ + CO ₃ ^- .

Therefore, even if a large amount of hydroxyl groups are generated in the water on the cathode chamber side by electrolysis, they will be separated into H ⁺ and HCO ₃ ^- or H ⁺ and CO ₃ ^- , and OH ^- +H ⁺ →H ₂ O and consumes the hydroxyl group, resulting in a significant drop in electrolytic efficiency.

In addition, when electrolytic action is applied, useful calcium ions gather on the cathode chamber side, but the carbonic acid mentioned above shows a reaction of H ₂ CO ₃ +Ca→H ₂ +CaCO ₃ , becomes calcium carbonate, and precipitates. Otherwise, it may adhere to the electrode surface as scale, reducing the current conductivity. For this reason, it also has the disadvantage of consuming Ca ^- .

Therefore, a method was adopted in which air was blown into the water to create foam and remove carbon dioxide gas. This takes advantage of the fact that the degree of gas solubility in water is constant under certain conditions (atmospheric pressure and temperature), and by substituting carbon dioxide with air, the amount of dissolved carbon dioxide is substantially reduced. In this specific method, air is supplied through a plate with many holes at the bottom of the aquarium, and the air that rises in the form of bubbles through the water in the tank is brought into contact with the water on the surface of the bubbles, and the air is submerged in water. There are some methods that can replace carbon dioxide with carbon dioxide. However, this method simply sends in outside air, and the amount of air supplied is small compared to the amount of water.
Since the bubbles are large and a sufficient surface area of gas-liquid contact cannot be obtained, the expected carbonation removal cannot be achieved.

The present invention was developed based on the above circumstances, and by dispersing and supplying water to the porous partition wall while fragmented heated and pressurized air is being ejected through the partition wall, Almost all of the water is bubbled to achieve a high degree of air contact,
Another object of the present invention is to provide a water carbonation removal device that can effectively remove carbonation from a sufficient amount of water in a short period of time by utilizing the water storage tank as it is for gas-liquid separation.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In the figure, reference numeral 1 denotes a cylindrical main body of the apparatus, in which a bubbling chamber 2 and a gas-liquid separation chamber 3 are placed adjacent to each other in the upper part, and a water storage chamber 4 is installed in the lower part. The foaming chamber 2 is provided with a pressurized air supply chamber 5 at its bottom, and the top of the pressurized air supply chamber 5 is made by unglazing or semi-molten aggregation of fine particles of synthetic resin. A ventilation porous plate such as "Palcon" or other porous partition wall 6 having countless pores is attached. Further, an air duct 7 is provided on one side of the pressurized air supply chamber 5, and this air duct 7 communicates with an air chamber 8 formed at the top of the apparatus main body 1. A discharge port of a blower 9 is open in the air chamber 8, and pressurized air is introduced into the air chamber 8 by driving the blower 9, and is supplied to the pressurized air supply chamber 5 via the duct 7. It's becoming like that. In this embodiment, the air chamber 8 is equipped with an electric heater 10.
is provided to heat the supply air.

Further, the whisking chamber 2 is arranged opposite to the partition wall 6.
An opening 11a of a water supply pipe 11 is located at the bottom of the water supply pipe 11, and the water supply pipe 11 is connected to a water pipe (not shown) via a solenoid valve 12.

Further, in the boundary area between the whisking chamber 2 and the gas-liquid separation chamber 3, overflow tubes 13, 13, which set the actual height of the whisking chamber 2, have their upper ends open. 13, 13 have their lower ends communicating with the water storage chamber 4. Further, a duct 14 is provided at the top of the gas-liquid separation chamber 3, and the duct 14 is bent into an L shape, and has an opening 14a on the lower surface of the bent and horizontally extending end. Separation chamber 3
The separated air (including carbon dioxide gas) can be released to the outside.

In addition, to prevent dust from entering from the outside,
A suitable filter element 15 is provided.

A supply pipe 16 for supplying treated water to the electrolyzer is connected to the water storage chamber 4 .

In addition, in the figure, the reference numeral 17 is a liquid level detector of the water storage chamber 4, and four level sensors 17a, 17
b, 17c, and 17d.

Next, the operation of this device will be specifically explained. When the liquid level in the water storage chamber 4 falls below the level sensor 17b, an OFF signal is detected by the level detector 17, the blower 9 is driven in response to the drive signal, and the solenoid valve is opened in response to the open signal. Ru. As a result, the segmented air flow enters the bubbling chamber 2 through the partition wall 6, but a water flow is ejected and diffused onto the partition wall 6 from the water supply pipe 11 through the opening 11a. This is where bubbling occurs. Since the air flow rate is enormous compared to the amount of water supplied, the occurrence of bubbles is significant, and all of the supplied water rises in the form of bubbles. The bubbles are fine at first, but as the deterrent force exerted by the bubbles on the upper side decreases during the rising process, the bubbles expand and grow as they move upward to the gas-liquid separation chamber 3. In particular, when the air is heated as in this example, its growth is easily achieved. In the gas-liquid separation chamber 3, the air is separated from the rising air flow (rising as water bubbles) at the level of the upper opening of the overflow tubes 13, 13, and the overflow tubes 13,
13, and flows down into the water storage chamber 4 from the overflow tube. Then, just before entering the overflow tube, or during the process of flowing through the overflow tube, the water bubbles partially burst, resulting in gas-liquid separation, and the water enters the lower water storage chamber 4, and the air containing carbon dioxide gas , ascending upward to the gas-liquid separation chamber 3
It is discharged to the outside through the duct 14. In addition, the water that enters the water storage chamber 4 as bubbles is near the liquid level in the water storage chamber 4, and over time, it breaks and allows air to enter the gas-liquid separation chamber 3 through the overflow tubes 13, 13. The liquid is raised and discharged from the duct 14 to the outside. The water that has returned to water from the bubbles is stored in the water storage chamber 4. In this case, if the water source is tap water, it is convenient because the action of removing chlorine gas is also achieved at the same time.

When the water level in the water storage chamber 4 reaches the level sensor 17a, a signal enters the level detector 17, which stops the blower 9 and closes the solenoid valve. Note that the level sensors 17c and 17d may be used for the purpose of, for example, controlling the opening and closing of a solenoid valve at a supply destination.

Note that the pressure of the supply air is such that even if water remains in the bubbling chamber 2, bubbling in the area from the partition wall 6 to the upper gas-liquid separation chamber 3 is hindered by the remaining water in the surrounding area. Considering the relationship with the amount of water diffused from the opening 11a of the water supply pipe 11 to the surface of the partition wall 6 (the above-mentioned area is almost entirely occupied by water bubbles), The amount of air is set to be enormous compared to the amount of water.

Further, in this embodiment, the water storage chamber 4 is configured integrally with the bubbling chamber 2 and the gas-liquid separation chamber 3, but they may be configured separately and communicated via the overflow tubes 13, 13. . Further, although a cylinder for overflowing is used in this embodiment, it goes without saying that a flat overflowing wall may also be used.

In addition, the gas-liquid separation means for separating water and air from water bubbles is provided in the gas-liquid separation chamber 3, the overflow tube 10, the water storage chamber 4, etc. It is defined here as functioning in all areas where the

Furthermore, although this embodiment has been described with respect to tap water, it goes without saying that it can also be applied to the treatment of sewage.

The present invention has been described in detail above, and a porous partition is provided at the bottom of the whisking chamber, and pressurized air is blown into the whipping chamber from below through the partition, and a water supply means is provided on the upper surface of the partition. A gas-liquid separation chamber is configured above the whisking chamber, and a gas-liquid separation chamber is provided at a level below the whisking chamber via an overflow portion opening into the gas-liquid separation chamber. The air pumping force is adjusted to the water supply amount of the water supply means so that at least the bubbling region flowing from the partition wall to the overflow part is strong enough to be unobstructed by surrounding water. It is set in relation to
In addition, the water in the water tank is taken out from the bottom, unlike the method of blowing air into the water.
The water that is sequentially diffused and supplied to the partition wall grows into bubbles and rises, increasing the amount of air contact per area, and the carbon dioxide contained in the water is taken out into the air. The carbon dioxide can be replaced with air, and carbon dioxide can be discharged significantly. In addition, the water bubbles that enter the water storage chamber from the overflow part are broken over time, and the water storage chamber itself is used as a place to perform the function of gas-liquid separation. However, since the water is discharged from the bottom of the water storage chamber, it is discharged with air bubbles mixed in, and there is no fear that the water will be supplied to an electrolytic cell, for example, which is a practical effect.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view showing an embodiment of the present invention;
FIG. 2 is a cross-sectional plan view of the same. 1... Apparatus body, 2... Foaming chamber, 3... Gas-liquid separation chamber, 4... Water storage chamber, 5... Pressure air supply chamber,
6... Partition wall, 9... Blower, 11... Water supply pipe,
13...Overflow tube.

Claims (1)

[Scope of utility model registration request] A porous partition is provided at the bottom of a whisking chamber provided near the opening of the water supply section, and an air passageway is provided for sending pressurized air from the outside of the whisking chamber to the pressure air chamber below the partition wall via a blower. An apparatus for removing carbon dioxide from water, characterized in that a heater is provided in an air chamber below a blower.