KR20100094742A - Apparatus and method for dissolving gas with high efficiency - Google Patents

Abstract

PURPOSE: An apparatus and a method for dissolving gas with high efficiency is provided to improve the dissolution rate of the dissolving gas by forming a gas layer in a housing, which is installed in liquid, and implement a re-dissolving process with respect to the gas layer. CONSTITUTION: A housing(130) is installed in liquid which fills a reaction tank(110), and the lower side of the housing is opened to trap gas in order to form a gas layer. An air diffuser(120) is installed on the lower side of the reaction tank to generate bubble. A second gas supplying unit supplies external gas to the air diffuser. A first gas supplying unit(210) inhales gas in the housing and re-circulates the inhaled gas.

Description

Apparatus and Method for dissolving gas with high efficiency

The present invention relates to an apparatus and method for dissolving gas in a liquid, and more particularly, to dissolve gas such as air, oxygen or ozone in a water treatment process or aquaculture farm, such as sewage, wastewater, and manure treatment plant, or dissolve in a liquid in a general industrial process. The present invention relates to a high-efficiency gas dissolving device and method for dissolving gas that is not dissolved by forming a housing in the liquid layer to dissolve various gases to be dissolved, thereby allowing the gas to be dissolved in the liquid more smoothly.

Conventionally, in order to supply gas such as oxygen and ozone to reaction tanks (bioreactors, aeration tanks, etc.) of sewage, wastewater, and manure treatment plants, an air diffuser is installed at the bottom of the reaction tank, and gas is supplied from a blower to generate bubbles in the air diffuser. The bubbles were brought into contact with the liquid to dissolve the gas, or mechanically stirred at the top of the reactor to supply the gas.

However, the air or oxygen supplied into the liquid in the form of bubbles through the air diffuser rises immediately above the surface due to buoyancy, so that the residence time in the water is short, and most of them are not dissolved in the water. In addition, at the upper end of the reaction vessel, the pressure acting on the gas is lower than that of the lower end, so that most of the oxygen supplied due to the phenomenon in which the solubility of oxygen is relatively decreased is not dissolved in the liquid and blows off into the atmosphere. Therefore, in bioreactors such as sewage, wastewater, and manure treatment plants, the oxygen transfer efficiency is very low at a level of 5 to 15%, resulting in a waste of feed gas, and thus, a high cost.

In addition, in the ozone contact facility, the ozone introduced through the ozone supply device and the acid generator is short in residence time in the liquid of the contact facility, and there is a limit in that it does not effectively utilize the pressure acting in the liquid and thus does not increase the delivery rate of ozone.

1 is a view showing a conventional gas dissolving device.

The conventional gas dissolving device includes a reaction tank 10, an air dispersing device 20 installed on a lower surface of the reaction tank, an external gas supply device 30 for supplying compressed air to the air dispersing device, and a gas pipe 40.

When the compressed air is supplied from the external gas supply device 30 to the air diffuser 20 installed in the water, bubbles 50 are generated in the air diffuser 20. At this time, the generated bubble 50 rises to the surface, and the oxygen in the bubble 50 is dissolved in water by contact with water to supply oxygen.

When using the conventional apparatus as described above, there is a problem that only a small amount of the supplied gas is dissolved in water, so that the required dissolved oxygen concentration does not reach much.

The present invention devised to solve the problems of the prior art as described above is to install a housing inside the liquid layer in the reaction tank to collect the gas to form a gas layer so that the gas collected inside the housing can be dissolved again in the liquid gas The purpose is to provide a high efficiency gas dissolving apparatus and method that can further increase the dissolution rate of the.

In addition, the present invention by sucking and recirculating the gas collected in the housing to dissolve and discharge the gas once supplied to the maximum, so that the solubility is increased by the pressure formed in the liquid layer by recirculating the gas in a certain area in the liquid. Another purpose is to provide a high efficiency gas dissolving apparatus and method capable of dissolving gas with high efficiency.

It is another object of the present invention to provide a high efficiency gas dissolving device and method for dissolving more gas by installing a stirring device at the interface between a liquid and a gas layer in a housing.

In addition, the present invention is the first gas supply device for sucking the gas inside the housing and re-supplied to the diffuser device and the second gas supply device for supplying the external gas is installed separately to facilitate the operation of high efficiency gas melting It is another object to provide an apparatus and method.

An object of the present invention is a device for dissolving gas in a liquid, comprising: a housing provided in a liquid filled in a reaction tank, the lower surface of which is open to collect gas to form a gas layer; An diffuser provided at the bottom of the reactor to generate bubbles; And a first gas supply device for supplying an external gas to the diffuser for generating the bubbles, and sucking and recirculating the gas in the housing.

Another object of the present invention is to provide a device for dissolving gas in a liquid, comprising: a housing provided in a liquid filled in a reaction tank, the lower surface of which is open to collect gas to form a gas layer; An diffuser provided at the bottom of the reactor to generate bubbles; A second gas supply device for supplying an external gas to the diffuser to generate bubbles; And a first gas supply device for sucking and recirculating the gas in the housing.

In addition, the present invention preferably further comprises a circulating gas control valve for controlling the flow of the gas is sucked in the housing and recycled.

In addition, the present invention preferably further includes a liquid removing device for removing the liquid component in the gas sucked into the housing.

In addition, the present invention preferably further comprises a first stirring device for stirring the liquid located on the water surface in the housing.

In addition, the present invention preferably further comprises a second stirrer for agitating so that the liquid flow in the upper portion of the reactor is maintained at the upper end of the housing.

In addition, the present invention preferably further comprises a level sensor for maintaining a constant liquid level inside the housing.

In addition, the present invention preferably further comprises a gas concentration measuring device for measuring the concentration of the gas layer in the housing and dissolved gas measuring device for measuring the concentration of dissolved gas in the liquid.

In addition, the present invention preferably further comprises a housing diffuser device for connecting to one side of the housing to discharge the gas inside the housing to increase the dissolution rate of the gas.

In addition, another object of the present invention is to supply an external gas to the diffuser through a gas supply device to generate a bubble to supply gas to the liquid; Collecting gas in a space inside the housing in the liquid to form a gas layer; Detecting a water level that varies according to the amount of gas in the gas layer; And when the water level in the housing reaches a certain level, sucking the gas collected in the housing and resupplying the gas to the gas supply device.

In addition, the present invention preferably further comprises the step of dissolving the gas in the liquid by stirring by the first stirring device located on the water surface in the housing.

In addition, the present invention preferably further comprises the step of removing the liquid component in the gas sucked in the housing.

In addition, the present invention preferably further comprises the step of supplying the gas sucked in the housing and the external gas supplied from the first gas supply device or the second gas supply device together with the diffuser device.

In addition, the present invention comprises the steps of measuring the gas concentration inside the housing; And adjusting the external gas supply amount according to the measured gas concentration.

In addition, the present invention comprises the steps of measuring the dissolved gas concentration in the liquid; And adjusting the amount of gas supplied to the diffuser according to the measured concentration of the dissolved gas or adjusting the amount of stirring of the first stirring device.

In addition, the present invention preferably further comprises the step of discharging the excess gas in the form of small bubbles through the housing diffuser device if the gas layer inside the housing is collected more than the amount of gas required for circulation.

In addition, the present invention maintains a high dissolved oxygen concentration by dissolving a large amount of oxygen or air in the liquid at the lower part of the housing, and keeping the dissolved oxygen concentration low by dissolving or dissolving less oxygen or air in the liquid at the upper part of the housing. It is desirable to enable advanced treatment of wastewater.

Therefore, the high-efficiency gas dissolving apparatus and method of the present invention install a housing inside the liquid layer in the reaction tank to collect the gas to form a gas layer so that the gas collected inside the housing can be dissolved in the liquid again, and There is a remarkable and advantageous effect that the dissolution rate of the gas can be further increased by installing and stirring the stirring device at the interface of the gas layer.

In addition, the high-efficiency gas dissolving apparatus and method of the present invention is formed in the liquid layer by allowing the gas supplied once to dissolve and discharge as much as possible by discharging and recirculating the gas collected in the housing, and recycling the gas in a certain area in the liquid. There is a remarkable and advantageous effect of dissolving gas with high efficiency by allowing solubility to be increased by pressure.

In addition, the high-efficiency gas dissolving apparatus and method of the present invention by measuring the gas concentration in the housing to adjust the external gas supply amount according to the gas concentration, by measuring the dissolved gas concentration in the liquid to adjust the amount of gas supplied to the acid generator There is a significant and advantageous effect of optimizing the gas supply without wasting gas.

In addition, the high-efficiency gas dissolving apparatus and method of the present invention have a remarkable and advantageous effect of maintaining a high dissolved oxygen concentration at the lower end of the housing and a low dissolved oxygen concentration at the upper end of the housing to enable efficient water treatment during advanced wastewater treatment. have.

In addition, the high-efficiency gas dissolving device and method of the present invention is provided with a first gas supply device that sucks the gas inside the housing and supplies it back to the air diffuser and a second supply device that supplies the external gas for convenience of operation. There is a significant and advantageous effect that can be achieved.

In addition, the high-efficiency gas dissolving device and method of the present invention has a remarkable and advantageous effect of preventing the occurrence of mechanical problems of the gas supply device by the liquid component by removing the liquid component in the gas sucked into the housing in the liquid removal device. .

The terms or words used in this specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a schematic cross-sectional view showing a high efficiency gas dissolving device according to an embodiment of the present invention.

High-efficiency gas dissolving device according to an embodiment of the present invention includes a reaction tank 110, diffuser 120, housing 130, water level detector 140, the first gas supply device 210, gas pipe 220 It is configured by.

The diffuser 120 is installed at the lower end of the housing and receives gas from the first gas supply device 210 to generate bubbles 190 to supply gas to the liquid filled in the reactor 110. At this time, the external gas control valve 250 is connected to the first gas supply device 210 to adjust the amount and flow of the external gas.

The housing 130 is installed in the liquid filled in the reaction tank, and the bottom surface is open. Bubbles that are not dissolved in the liquid of the bubbles 190 generated in the diffuser 120 rises and are collected in the housing 130 to form a gas layer 191. The water level detector 140 is installed on one side of the lower end of the housing 130 to detect and maintain the liquid level inside the housing 130 which is changed as the gas layer 191 is formed in the housing 130.

The first stirring device 150 is installed on the surface of the housing 130 to stir between the liquid and the gas layer 191 filled in the housing 130, so that the gas collected in the housing 130 is not dissolved. It can be dissolved again to increase the dissolution efficiency. In addition, a second stirrer 160 may be installed at an upper end of the housing 130 to maintain the liquid flow in the upper portion of the reaction tank 110 to prevent solids from being precipitated.

As described above, the first gas supply device 210 serves to supply external gas to the diffuser 120, but also sucks and recirculates the gas when a predetermined amount of gas is collected in the housing 130. . In this case, the circulating gas control valve 240 controls the flow of gas sucked in the housing 130 and recycled, and the liquid removing device 230 is installed to remove the liquid component in the gas sucked in the housing.

Further, the gas concentration measuring device 170 is installed on one side of the housing 130 to measure the concentration of the gas layer 191 in the housing 130, and the dissolved gas measurement to measure the dissolved gas concentration in the liquid. The device 180 may be installed on one side of the reaction tank 110 to adjust the supply amount of external gas.

Looking at the method of dissolving the gas using a high-efficiency gas dissolving device according to an embodiment of the present invention.

First, when the external gas control valve 250 is opened to supply external gas to the diffuser 120 through the first gas supply device 210, the diffuser 120 ejects gas in the form of bubbles 190 in the liquid. Let's do it. Bubble 190 generated from the diffuser 120 is raised while a part is dissolved in the liquid, most of the remaining undissolved gas is collected in the housing 130 to form a gas layer 191.

As the gas is gradually collected after a certain time, the water level in the housing 130 is gradually lowered and the water level sensor 140 detects this. When the value sensed by the water level detector 140 reaches a predetermined level, the circulating gas control valve 240 is opened to supply the gas inside the housing 130 to the first gas supply device 210. Here, the gas flowing from the housing 130 through the gas pipe 220 to the first gas supply device 210 is removed through the liquid removal device 230 before being supplied to the first gas supply device 210. .

In this way, the gas supplied to the first gas supply device 210 is supplied to the diffuser 120 again by the first gas supply device 210 and recycled. At this time, when the amount of gas sucked in the housing 130 is less than the amount to be supplied to the diffuser 120, open the external gas control valve 250 to supply the external gas to the diffuser 120 with the external gas Send to.

In addition, by stirring the first stirring device 150 provided on the water surface in the housing 130, the gas collected in the housing 130 is dissolved again in the liquid.

In addition, the gas concentration measuring device 170 is used to measure the gas concentration inside the housing 130 to adjust the external gas supply amount, and the dissolved gas measuring device 180 measures the dissolved gas concentration in the liquid and supplies it to the diffuser. It can be controlled automatically by adjusting the amount of gas to be used or by adjusting the amount of stirring of the first stirring device.

According to the present invention, the gas layer 191 in the housing 130 located in the reactor 110 is subjected to a high pressure by the depth of the liquid. In addition, since the pressure in the first gas supply device 210 is recirculated by connecting and recirculating the gas in the housing 130 to the gas supply device, the pressure of the first gas supply device 210 is only a difference between the depth of the water inside the housing and the diffuser 120 installed. In a state in which the required power of the 1 gas supply device 210 is low, the gas can be intensively abandoned at the bottom of the reactor 110. As a result, the gas dissolution rate increases in proportion to the pressure (depth), so the concentrated aeration method at the bottom of the reactor relatively increases the dissolution rate of the gas.

The present invention is characterized in that the gas dissolution rate can be increased while reducing the gas waste rate by recycling the gas which has risen without being dissolved in the liquid and disappears into the air.

3 is a cross-sectional view schematically showing a high efficiency gas dissolving device according to another embodiment of the present invention.

High-efficiency gas dissolving device according to another embodiment of the present invention is the reaction tank 110, the diffuser 120, the housing 130, the water level detector 140, the first gas supply device 210, the gas pipe 220, It comprises a 2 gas supply device 260.

According to another embodiment of the present invention, the second gas supply device 260 is separately installed to supply external gas, and the gas sucked in the housing 130 and recycled is supplied through the first gas supply device 210. Configured. Other configurations are the same as in one embodiment of the present invention.

Looking at the method of dissolving the gas using a high-efficiency gas dissolving device according to another embodiment of the present invention.

First, when the second gas supply device 260 is operated to supply external gas to the diffuser 120, the diffuser 120 ejects gas in the form of bubbles 190 in the liquid. Bubbles generated in the diffuser 120 rise while some are dissolved in the liquid layer, and most of the remaining undissolved gas is filled in the housing 130 to form the gas layer 191.

As the gas is gradually collected after a certain time, the water level in the housing 130 is gradually lowered and the water level sensor 140 detects this. Then, the circulating gas control valve 240 is opened to supply the gas inside the housing to the first gas supply device 210. Here, the gas flowing from the housing 130 through the gas pipe 220 to the first gas supply device 210 is removed through the liquid removal device 230 before being supplied to the first gas supply device 210. . In this way, the gas is supplied to the diffuser 120 again by the first gas supply device 210 and recycled. Here, when the amount of gas sucked inside the housing 130 is insufficient than the amount to be supplied to the diffuser pipe 120, the second gas supply device 260 supplies the external gas by the amount insufficient.

4 to 5 are cross-sectional views schematically showing a high efficiency gas dissolving device according to another embodiment of the present invention.

As shown in FIG. 4, the housing 130 is installed in a liquid, and bubbles are generated in the diffuser 120 connected to the second gas supply device 260 to collect most of the undissolved gas in the housing 130. After the formation, the mixture is formed to increase the gas dissolution rate by stirring.

In addition, as shown in FIG. 5, the external gas supply device 260 is connected to the housing 130 to supply a gas directly to the inside of the housing 130 to form a gas layer, and then stir to increase the gas dissolution rate.

Figure 6 is a detailed view showing a housing of the high efficiency gas dissolving device according to an embodiment of the present invention.

As shown in FIG. 6, the housing diffuser 131 is connected to one side of the housing 130 and installed. Here, the housing diffuser 131 may be directly installed in the housing 130 or may be installed by connecting with a pipe. When gas necessary for circulation is collected in the housing 131, the excess gas is discharged in the form of small bubbles through the housing diffuser 131. This can further increase the gas dissolution rate in the liquid.

7 is a view showing a process chart of wastewater, sewage, manure, livestock manure, leachate and the like using the high-efficiency gas dissolving device of the present invention.

Next, a method of dissolving oxygen or air at high efficiency in a bioreactor of wastewater, sewage, manure or leachate using the high efficiency gas dissolving device of the present invention described above will be described.

By dissolving a large amount of oxygen or air in the liquid below the housing 130 to maintain a high dissolved oxygen concentration, and by dissolving or dissolving less oxygen or air in the liquid above the housing 130 by maintaining a low dissolved oxygen concentration The lower end of the housing may be designed to maintain an aerobic state and the upper end of the housing may be anaerobic to allow advanced treatment of wastewater.

Furthermore, the present invention performs a pretreatment step (S310), a biological treatment step (S320), a post-treatment step (S330) in sequence biological treatment step (S320) during the treatment of wastewater, sewage, manure, livestock manure, leachate, etc. Can be utilized. By using the high efficiency gas dissolving device of the present invention by utilizing a method of dissolving oxygen or air in the bioreactor with high efficiency, the efficiency of the biological treatment process (S320) can be improved.

The present invention is intended to dissolve gases such as air, oxygen, ozone, etc. in water treatment processes or aquaculture farms, such as sewage treatment plants, wastewater treatment plants, manure treatment plants, livestock manure treatment plants, and leachate treatment plants, or to dissolve various gases in liquids in general industrial processes. By collecting the supplied gas from the housing 130 and resupplying the gas, the gas delivery rate can be much increased, so that the gas can be dissolved in the liquid with high efficiency.

Although the present invention has been shown and described with reference to the preferred embodiments as described above, it is not limited to the above embodiments and those skilled in the art without departing from the spirit of the present invention. Various changes and modifications will be possible.

1 is a schematic view showing a device for dissolving gas in a conventional liquid;

2 is a schematic view showing a high efficiency gas dissolving device according to an embodiment of the present invention;

3 is a schematic view showing a high-efficiency gas dissolving device according to another embodiment of the present invention,

4 to 5 is a schematic view showing a high efficiency gas dissolving device according to another embodiment of the present invention,

Figure 6 is a detailed view showing a housing of the high efficiency gas dissolving device according to an embodiment of the present invention,

7 is a view showing a process chart of wastewater, sewage, manure, livestock manure, leachate and the like using the high-efficiency gas dissolving device of the present invention.

<Explanation of symbols for the main parts of the drawings>

110: reactor 120: diffuser

130 housing 140 level sensor

150: first stirring device 160: second stirring device

170: gas concentration measuring device 180: dissolved gas measuring device

190 bubble 191 gas layer

210: first gas supply device 220: gas pipe

230: liquid removal device 240: circulating gas control valve

250: external gas control valve 260: second gas supply device

Claims (17)

In a device for dissolving a gas in a liquid, A housing provided in the liquid filled in the reaction tank, the lower surface of which is opened to collect gas to form a gas layer; An diffuser provided at the bottom of the reactor to generate bubbles; And A first gas supply device for supplying an external gas to the diffuser to generate the bubbles, and sucking and recirculating the gas in the housing High efficiency gas dissolving device comprising a. In a device for dissolving a gas in a liquid, A housing provided in the liquid filled in the reaction tank, the lower surface of which is opened to collect gas to form a gas layer; An diffuser provided at the bottom of the reactor to generate bubbles; A second gas supply device for supplying an external gas to the diffuser to generate bubbles; And First gas supply device for sucking and recirculating the gas in the housing High efficiency gas dissolving device comprising a. The method according to claim 1 or 2, And a circulating gas control valve for controlling the flow of the gas sucked into the housing and recycled. The method according to claim 1 or 2, And a liquid removing device for removing a liquid component in the gas sucked into the housing. The method according to claim 1 or 2, And a first stirrer disposed on the water surface in the housing to stir the liquid. The method according to claim 1 or 2, And a second stirrer disposed at an upper end of the housing to stir to maintain a liquid flow in the upper portion of the reactor. The method according to claim 1 or 2, And a level sensor for maintaining a constant liquid level in the housing. The method according to claim 1 or 2, A gas concentration measuring device for measuring the concentration of the gas layer in the housing; And And a dissolved gas measuring device for measuring the concentration of dissolved gas in the liquid. The method according to claim 1 or 2, It is connected to one side of the housing is a high efficiency gas dissolving device further comprises a dispersing device for the housing to discharge the gas inside the housing to increase the dissolution rate of the gas. (A) supplying an external gas to the diffuser through a gas supply device to generate bubbles to supply gas to the liquid; (B) trapping a gas in a space inside the housing in the liquid to form a gas layer; (C) detecting a water level which varies according to the amount of gas in the gas layer; And (D) inhaling the gas collected in the housing and resupplying it to the gas supply device when the water level in the housing reaches a certain level; High efficiency gas dissolving method comprising a. The method of claim 10, And dissolving the gas in the liquid by stirring by a first stirring device located on the water surface in the housing. The method of claim 10, The step (d), And removing the liquid component in the gas sucked from the housing. The method of claim 10, The step (d), A method of dissolving gas further comprising the step of supplying the gas sucked in the housing and the external gas supplied from the first gas supply device or the second gas supply device together to the diffuser device The method of claim 10, Measuring a gas concentration inside the housing; And Adjusting the external gas supply amount according to the measured gas concentration further comprises a high efficiency gas dissolving method. The method of claim 10, Measuring the concentration of dissolved gas in the liquid; And And adjusting the amount of gas supplied to the diffuser according to the measured concentration of the dissolved gas or adjusting the amount of stirring of the first stirring device. The method of claim 10, When the gas layer inside the housing is collected more than the amount of gas required for circulation, the excess gas is discharged in a small bubble form through the air diffuser for the housing further comprises the step of dissolving the high efficiency gas. The method of claim 10, Oxygen or air is dissolved in a large amount of liquid in the lower part of the housing to maintain a high dissolved oxygen concentration, and a low dissolved oxygen concentration is maintained in the liquid in the upper part of the housing so that oxygen or air is not dissolved or dissolved. Highly efficient gas dissolving methods that make it possible.

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