CN111499014B - Method for aerating by using oxygen-enriched ceramic membrane aeration device - Google Patents
Method for aerating by using oxygen-enriched ceramic membrane aeration device Download PDFInfo
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- CN111499014B CN111499014B CN202010344056.4A CN202010344056A CN111499014B CN 111499014 B CN111499014 B CN 111499014B CN 202010344056 A CN202010344056 A CN 202010344056A CN 111499014 B CN111499014 B CN 111499014B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses an oxygen-enriched ceramic membrane aeration device, a combination thereof and an aeration method thereof, wherein the oxygen-enriched ceramic membrane aeration device comprises a shell, an upper sealing mounting plate, a lower sealing mounting plate and a ceramic membrane tube; the upper sealing mounting plate and the lower sealing mounting plate are respectively mounted at the top and the bottom in the shell; more than one ceramic membrane tube is arranged, the top of each ceramic membrane tube is arranged on the upper sealing mounting plate, and the bottom of each ceramic membrane tube is arranged on the lower sealing mounting plate; a liquid inlet pipeline is arranged at the bottom of the shell, a liquid inlet valve and a first pressure gauge are arranged on the liquid inlet pipeline, a liquid inlet pipeline is arranged at the top of the shell, and a second pressure gauge and a liquid outlet valve are arranged on the liquid outlet pipeline; the top of one side of the penetration part is provided with an air inlet pipeline, the air inlet pipeline is provided with an air inlet valve, the bottom of the other side of the penetration part is provided with an exhaust blow-off pipeline, and the exhaust blow-off pipeline is provided with a discharge valve. The invention not only uniformly dissolves the micro-bubbles in the liquid, but also forms oxygen-enriched gas-liquid two-phase flow, thereby not only accelerating the mass transfer efficiency, but also dissolving more oxygen.
Description
Technical Field
The invention relates to an oxygen-enriched ceramic membrane aeration device, an oxygen-enriched ceramic membrane aeration combination and an oxygen-enriched ceramic membrane aeration method, and belongs to the field of ceramic membranes.
Background
Mariculture, oxygen-enriched irrigation, oxygen-enriched reaction and the like need to dissolve oxygen in a corresponding liquid in the form of bubbles by using a physical or chemical method to form an oxygen-enriched dispersion. Chemical methods are costly and introduce impurities. Physical methods are mostly realized by directly blowing gas into liquid through a pipeline, however, the method has poor uniformity and large bubble volume, and is difficult to obtain uniform oxygen-enriched microbubble dispersion.
Ceramic membrane (also called inorganic ceramic membrane) is used as a filtering element, is widely applied to various industries such as food and beverage, biomedicine, chemical industry, metallurgical power generation, environmental protection water treatment and the like, and has the characteristics of good chemical stability, high mechanical strength, good high temperature resistance, high filtering precision and the like. If the ceramic membrane can be applied to preparation of the oxygen-enriched microbubble liquid, the application of the ceramic membrane can be widened, and the preparation cost of the oxygen-enriched microbubble dispersion can be reduced.
Disclosure of Invention
The invention provides an oxygen-enriched ceramic membrane aeration device, a combination and an aeration method thereof, which utilize the high strength, the chemical stability, the high temperature resistance and the porosity with uniform aperture of a ceramic membrane to dissolve micro bubbles in liquid and dissolve the oxygen-enriched micro bubbles in the liquid through a high-pressure oxygen dissolving mechanism to form oxygen-enriched gas-liquid two-phase flow, thereby not only accelerating the mass transfer efficiency, but also dissolving more oxygen and greatly facilitating the preparation of oxygen-enriched liquid; broadens the application field of the ceramic membrane and improves the production efficiency and the quality of the liquid of the oxygen-enriched microbubbles.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an oxygen-enriched ceramic membrane aeration device comprises a shell, a sealing mounting plate and a ceramic membrane tube; the sealing mounting plate comprises an upper sealing mounting plate and a lower sealing mounting plate which are oppositely arranged, and the upper sealing mounting plate and the lower sealing mounting plate are respectively mounted at the top and the bottom in the shell; more than one ceramic membrane tube is arranged, the top of each ceramic membrane tube is arranged on the upper sealing mounting plate, the bottom of each ceramic membrane tube is arranged on the lower sealing mounting plate, and sealing rings are arranged between the top of each ceramic membrane tube and the upper sealing mounting plate and between the bottom of each ceramic membrane tube and the lower sealing mounting plate; a liquid inlet pipeline is arranged at the bottom of the shell below the lower sealing mounting plate, a liquid inlet valve and a first pressure gauge are arranged on the liquid inlet pipeline, a liquid outlet pipeline is arranged at the top of the shell above the upper sealing mounting plate, and a second pressure gauge and a liquid outlet valve are arranged on the liquid outlet pipeline; the part between the upper sealing mounting plate and the lower sealing mounting plate on the shell is a penetration part, the top of one side of the penetration part is provided with an air inlet pipeline, the air inlet pipeline is provided with an air inlet valve, the bottom of the other side of the penetration part is provided with an exhaust sewage discharge pipeline, and the exhaust sewage discharge pipeline is provided with a discharge valve.
The oxygen-enriched ceramic membrane aeration device utilizes the high mechanical strength and porosity of the ceramic membrane to form the ceramic membrane aeration device capable of forming oxygen-enriched microbubble liquid.
The bottom of the shell below the lower sealing mounting plate is provided with a liquid inlet pipeline, and the top of the shell above the upper sealing mounting plate is provided with a liquid outlet pipeline, namely, liquid enters from the bottom of the shell below the lower sealing mounting plate and flows out from the top of the shell above the upper sealing mounting plate after flowing through the ceramic membrane tube.
The applicant finds out through practical research that: when the oxygen-enriched ceramic membrane aeration device is used for aeration, water enters a ceramic membrane tube channel, gas enters from the side surface (the outer side of the ceramic membrane tube and the part in the shell), and permeates into the ceramic membrane tube from all directions to form micro bubbles which are uniformly and stably dispersed in the water; if water enters from the side, gas enters from the ceramic membrane tube and permeates to the side, because the gas cannot enter from all directions of the liquid, the liquid part close to the shell wall has less bubbles and large bubbles, while the liquid part close to the membrane tube has more bubbles and small bubbles, the effect of micro-bubble uniformity cannot be achieved, and the larger the bubbles are, the dissolved oxygen in the water is reduced; if a partition plate is installed in the housing outside the ceramic membrane tube, turbulence is intensified, and the applicant believes that when gas permeates from the inside of the ceramic membrane tube to the side, the movement path of bubbles increases, the bubbles increase, and the turbulence further intensifies the nonuniformity of the bubbles, so that the effect of microbubbles is not achieved, the uniformity is remarkably deteriorated, and the dissolved oxygen amount in water is also reduced.
In order to prevent the gas from entering the liquid inlet pipeline due to too large pressure during oxygen dissolution and further influencing the conveying of the pump, a check valve is further arranged on the liquid inlet pipeline, the check valve is arranged on the upstream of the liquid inlet valve, and a first pressure gauge is arranged on the downstream of the liquid inlet valve.
In order to facilitate control and measurement, a second pressure gauge, a liquid outlet valve, a flow meter, an output pressure gauge, a sight glass and a dissolved oxygen tester are sequentially arranged on the liquid outlet pipeline from upstream to downstream.
The shell that this application was used is resistant high pressure vessel.
To improve the uniformity of the microbubbles, all the ceramic membrane tubes are placed in parallel.
In order to improve the sealing effect, more than two layers of O-shaped sealing rings are arranged between the top of the ceramic membrane tube and the upper sealing mounting plate and between the bottom of the ceramic membrane tube and the lower sealing mounting plate.
The material used for the ceramic membrane tube is a ceramic material which is high in mechanical strength, good in chemical stability and high in temperature resistance, such as aluminum oxide, zirconium oxide, titanium oxide or silicon carbide, the aperture of the ceramic membrane tube is 5 nm-1 um, and the porosity is 30-60%.
An oxygen-enriched ceramic membrane aeration device combination is formed by connecting more than two oxygen-enriched ceramic membrane aeration devices in parallel. This allows for increased liquid throughput. Of course, when the demand is small, one oxygen-enriched ceramic membrane aeration device can also be operated independently.
The method for aerating by using the oxygen-enriched ceramic membrane aeration device comprises the following steps:
1) liquid feeding: opening a liquid inlet valve and a liquid outlet valve, enabling liquid to enter the ceramic membrane tube from a liquid inlet pipeline, controlling the liquid inlet speed to be not more than 2m/s, enabling the reading of a second pressure gauge to be not more than 0.2MPa, and closing the liquid outlet valve after the ceramic membrane tube is filled with the liquid;
2) dissolving gas: opening an air inlet valve, slowly introducing air for pressurization, keeping the pressure stable for 25-35 s when the reading of a first pressure gauge reaches 0.3-1 MPa, opening a liquid outlet valve, and discharging liquid containing oxygen-enriched microbubbles;
3) and (3) blowdown: closing the air inlet valve and the liquid inlet valve, and opening a discharge valve on the exhaust sewage discharge pipeline for sewage discharge;
4) air washing: and closing the liquid inlet valve and the discharge valve on the exhaust sewage discharge pipeline, opening the gas inlet valve and the liquid outlet valve, and introducing gas from the gas inlet pipeline again to purge the ceramic membrane tube. And blowing the blocked membrane pores to prevent long-term blockage.
The uniformity and stability of the microbubbles can be better ensured by controlling the liquid inlet speed and the liquid outlet pressure in the step 1), and the uniformity, the microscopicity, the oxygen enrichment property and the dispersity of the microbubbles can be ensured by controlling the pressure and the pressure maintaining time in the step 2), so that the uniform liquid of the oxygen-enriched microbubbles can be obtained.
In the method, advanced liquid is needed, air is introduced after the liquid is stabilized, if the liquid is advanced, the problem that the liquid is difficult to enter or the liquid cannot be entered can occur, and if the air pressure is advanced, the air hammer phenomenon can occur due to local unevenness and the membrane tube is damaged; the liquid enters the ceramic membrane tube, gas permeates into the ceramic membrane tube from all directions to form micro bubbles which are uniformly and stably dispersed in water, and if the gas-liquid entering position is changed, the gas permeates outwards from the ceramic membrane tube and enters the liquid, so that the bubbles are increased, the uniformity is poor, and the oxygen content is reduced; simple and easy to operate and control, and high efficiency.
The gas used for air inlet in the step 2) is oil-free compressed air. The dissolved oxygen system is integrated into the aeration system of the membrane, so that the formed bubbles in the gas-liquid two-phase flow are tiny, the oxygen-enriched concentration is high, and the system requirements of some oxygen-enriched processes are met.
In order to further improve the uniform stability of the microbubbles, the difference value between the first pressure gauge and the second pressure gauge is controlled not to exceed 0.2MPa in the whole gas dissolving process in the step 2).
According to the method, the porosity and high mechanical strength of the ceramic membrane are fully utilized, under the action of high pressure, the residence time of liquid and gas in the aerator is controlled, oxygen in the air is fully dissolved in the liquid, and oxygen-enriched micro bubbles are formed through micropores of the ceramic membrane and discharged out of the aerator along with the liquid; the ceramic membrane can be used in liquid application requiring oxygen-enriched microbubbles, such as mariculture, oxygen-enriched irrigation, oxygen-enriched reactors and other systems, and the chemical stability and high mechanical strength of the ceramic membrane ensure that the system can stably operate for a long time in a plurality of application systems and is low in cost.
The prior art is referred to in the art for techniques not mentioned in the present invention.
The oxygen-enriched ceramic membrane aeration device aims at forming oxygen-enriched microbubbles, utilizes the characteristics of the ceramic membrane, such as high mechanical strength, high temperature resistance, excellent chemical stability and the like, and is assisted by high-pressure dissolved oxygen while forming uniform microbubbles by utilizing the ceramic membrane, so that the oxygen content in liquid is higher, the working requirement of the oxygen-enriched microbubbles is met, and compared with the prior art, the oxygen-enriched ceramic membrane aeration device has the following advantages:
1. the bubbles are tiny and evenly distributed in the liquid: the air bubbles are directly mixed with the liquid in the flow channel by being aerated from the permeation side of the ceramic membrane to the flow channel side of the membrane tube through the membrane holes, the high-precision uniform pore size distribution of the ceramic membrane ensures that the air bubbles aerated from the ceramic membrane holes are tiny and uniform, the flow channel is circular, gas can enter the liquid from each radial direction of the liquid, and the uniformity of the air bubbles in the liquid is ensured;
2. the air bubbles have high oxygen content concentration in the liquid and are uniformly distributed in the liquid in a relatively stable form: when microbubbles generated by the ceramic membrane are mixed in liquid, the pressure is not reduced, but is increased, and when the pressure is increased to a set value, the pressure stays for about 30s to stabilize dissolved oxygen, so that the stable state of the oxygen-enriched microbubbles in the fluid is ensured, the dissolved oxygen in the liquid is 3-5 times higher than that of a conventional aerator and reaches 64mg/L, and compared with a common aerator, the phenomenon that microbubbles are fused and grown up in the flowing process due to the reduction of the pressure is avoided;
3. the invention firstly feeds in liquid, and then feeds in gas after the aerator is full, so that the liquid cannot enter when the gas pressure is too large at the beginning, and if the gas pressure is too high, the phenomenon of gas hammer caused by difficult liquid feeding or local unevenness can be generated to damage the membrane tube;
4. in order to ensure long-term use of dissolved oxygen aeration, high-pressure gas is used for sweeping membrane pores after each use, so that the service life of the aerator is ensured;
5. the technology has simple process, compact equipment and convenient operation and maintenance, widens the application field of the ceramic membrane, greatly saves the investment and the operation cost, and improves the production efficiency and the quality of the liquid of the oxygen-enriched microbubbles.
Drawings
FIG. 1 is a schematic view of the oxygen-rich ceramic membrane aeration apparatus according to the present invention;
in the figure, 1, a liquid inlet valve, 2, a ceramic membrane shell, 21 a sealing and mounting plate, 22 'O' -shaped sealing rings, 23 ceramic membranes, 3, an air inlet valve, 4 a liquid outlet valve, 5 a second pressure gauge, 6 a discharge valve, 7 a first pressure gauge, 8 a check valve, 9 a flowmeter, 10 an output pressure gauge, 11 a dissolved oxygen determinator, 12 a liquid inlet, 13 a liquid outlet, 14 oil-free compressed air, 15 an exhaust sewage discharge outlet and 16 a sight glass.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
As shown in figure 1, the oxygen-enriched ceramic membrane aeration device comprises a shell, a sealing installation plate and a ceramic membrane tube; the shell is a high-pressure resistant container; the sealing mounting plate comprises an upper sealing mounting plate and a lower sealing mounting plate which are oppositely arranged, and the upper sealing mounting plate and the lower sealing mounting plate are respectively mounted at the top and the bottom in the shell; the ceramic membrane tube is made of aluminum oxide, the aperture of the ceramic membrane tube is 5 nm-1 um, the porosity is 30-60%, more than one ceramic membrane tube is arranged in parallel, the top of the ceramic membrane tube is arranged on the upper sealing mounting plate, the bottom of the ceramic membrane tube is arranged on the lower sealing mounting plate, and two layers of O-shaped sealing rings are arranged between the top of the ceramic membrane tube and the upper sealing mounting plate and between the bottom of the ceramic membrane tube and the lower sealing mounting plate; a liquid inlet pipeline is arranged at the bottom of the shell below the lower sealing mounting plate, a check valve, a liquid inlet valve and a first pressure gauge are sequentially arranged on the liquid inlet pipeline from upstream to downstream, a liquid outlet pipeline is arranged at the top of the shell above the upper sealing mounting plate, and a second pressure gauge, a liquid outlet valve, a flow meter, an output pressure gauge, a sight glass and a dissolved oxygen tester are sequentially arranged on the liquid outlet pipeline from upstream to downstream; the part between the upper sealing mounting plate and the lower sealing mounting plate on the shell is a penetration part, the top of one side of the penetration part is provided with an air inlet pipeline, the air inlet pipeline is provided with an air inlet valve, the bottom of the other side of the penetration part is provided with an exhaust sewage discharge pipeline, and the exhaust sewage discharge pipeline is provided with a discharge valve.
More than two groups of oxygen-enriched ceramic membrane aeration devices can be connected in parallel to form an oxygen-enriched ceramic membrane aeration device group, so that the treatment capacity of water is increased.
The method for aerating by using the oxygen-enriched ceramic membrane aeration device comprises the following steps:
1) liquid feeding: and opening the liquid inlet valve and the liquid outlet valve, allowing liquid (water) to enter the ceramic membrane tube from the liquid inlet pipeline, controlling the liquid inlet speed to be not more than 2m/s, and controlling the reading of the second pressure gauge to be not more than 0.2 MPa. After the ceramic membrane tube is filled with liquid, closing the liquid outlet valve;
2) dissolving gas: opening an air inlet valve, slowly introducing air and pressurizing (without oil compressed air), keeping the pressure stable for 25-35 s when the reading of a first pressure gauge reaches 0.3-1 MPa, opening a liquid outlet valve, and discharging liquid containing oxygen-enriched microbubbles; controlling the difference value between the first pressure gauge and the second pressure gauge not to exceed 0.2MPa in the gas dissolving process;
3) and (3) blowdown: closing the air inlet valve and the liquid inlet valve, and opening a discharge valve on the exhaust sewage discharge pipeline for sewage discharge;
4) air washing: and closing the liquid inlet valve and the discharge valve on the exhaust sewage discharge pipeline, opening the gas inlet valve and the liquid outlet valve, and introducing gas from the gas inlet pipeline again to purge the ceramic membrane tube. And blowing the blocked membrane pores to prevent long-term blockage.
Example 1
3 ceramic membranes with the pore diameter of 0.8um and the porosity of 37 percent are arranged in the oxygen dissolving ceramic membrane aerator, the pipeline is connected, and a valve flowmeter and a pressure gauge are connected. Open feed liquor valve and play liquid valve, slowly feed liquor through delivery pump by feed liquor pipeline through check valve, feed liquor valve and first manometer, control inlet velocity is not more than 2m/s, treats that the feed liquid is full of the aerator, when having liquid to flow out from going out the liquid valve, observes the reading of second manometer and does not exceed 0.2MPa, closes out the liquid valve. And simultaneously, opening an air inlet valve, slowly introducing air, pressurizing until the reading of a first pressure gauge is 0.3MPa, maintaining the pressure for 30s, and adjusting the liquid containing the oxygen-enriched microbubbles to the required flow and pressure by a liquid outlet valve to discharge the liquid out of the aerator. The difference value between the first pressure gauge and the second pressure gauge is controlled not to exceed 0.2MPa in the process. The bubbles can be seen from the sight glass to be micron-sized, uniform in size and uniform in distribution, and the reading of the bubble is 25.8mg/L when the bubble is read from the dissolved oxygen tester. And after recording the data of the pressure gauge, the flowmeter and the dissolved oxygen meter, performing subsequent work of exhausting or discharging sewage and gas washing.
Comparative example 1
3 ceramic membranes with 19 channels and the porosity of 37 percent and the aperture of 0.8um are arranged in the oxygen dissolving ceramic membrane aerator, compared with the embodiment 1, a water inlet pipeline and a water outlet pipeline are exchanged with an air inlet pipeline and an air exhaust pipeline, water enters from an air inlet at one side of a permeable part, water is discharged from an air exhaust and sewage discharge port at the other side of the permeable part, air enters from a water inlet part at the bottom of a shell, and air is discharged from a water discharge part at the top of the shell; opening a liquid inlet valve and a liquid outlet valve, slowly feeding liquid from a liquid inlet pipeline through a check valve, the liquid inlet valve and a first pressure gauge through a delivery pump, controlling the liquid inlet speed to be not more than 2m/s, observing that the reading of a second pressure gauge is not more than 0.2MPa when liquid flows out of the liquid outlet valve after the liquid is filled in an aerator, and closing the liquid outlet valve; and simultaneously, opening an air inlet valve, slowly introducing air, pressurizing until the reading of a first pressure gauge is 0.3MPa, maintaining the pressure for 30s, and adjusting the liquid containing the oxygen-enriched microbubbles to the required flow and pressure by a liquid outlet valve to discharge the liquid out of the aerator. The difference value between the first pressure gauge and the second pressure gauge is controlled not to exceed 0.2MPa in the process. The microbubbles were not uniform in size as seen from the sight glass and read 19.5mg/L from the dissolved oxygen meter. And after recording the data of the pressure gauge, the flowmeter and the dissolved oxygen meter, performing subsequent work of exhausting or discharging sewage and gas washing.
Comparative example 2
3 ceramic membranes with the pore diameter of 0.8um and the porosity of 37 percent are arranged in the oxygen dissolving ceramic membrane aerator, the pipeline is connected, and a valve flowmeter and a pressure gauge are connected. Firstly opening the air inlet valve, slowly introducing air and pressurizing until the reading of the first pressure gauge is 0.3MPa, then opening the liquid inlet valve and the liquid outlet valve, slowly feeding liquid through the liquid inlet pipeline, the check valve, the liquid inlet valve and the first pressure gauge by the delivery pump, and finally, when the first pressure gauge is less than 0.2MPa, water cannot enter the ceramic membrane pipe at all. When the pressure of inlet water is increased to 0.35MPa, liquid can be pumped into the membrane tube, but gas is driven out of the membrane tube because of low pressure, and micro-bubbles cannot be formed at all.
Comparative example 3
3 ceramic membranes with the pore diameter of 0.8um and the porosity of 37 percent are arranged in the oxygen dissolving ceramic membrane aerator, the pipeline is connected, and a valve flowmeter and a pressure gauge are connected. Opening a liquid inlet valve and a liquid outlet valve, slowly feeding liquid from a liquid inlet pipeline through a check valve, the liquid inlet valve and a first pressure gauge through a delivery pump, controlling the liquid inlet speed to be 2.5m/s, observing that the reading of a second pressure gauge is not more than 0.2MPa when liquid flows out of the liquid outlet valve after the liquid is filled in an aerator, and closing the liquid outlet valve; and simultaneously, opening an air inlet valve, slowly introducing air, pressurizing until the reading of a first pressure gauge is 0.3MPa, keeping the pressure stable for 15s, and adjusting the liquid containing the oxygen-enriched microbubbles to the required flow and pressure by a liquid outlet valve to discharge the liquid out of the aerator. The difference value between the first pressure gauge and the second pressure gauge is controlled not to exceed 0.2MPa in the process. Microbubbles were small and uniform as seen from the sight glass, but the dispersion density was significantly less than that of example 1, and the reading from the dissolved oxygen meter was 18.2 mg/L. And after recording the data of the pressure gauge, the flowmeter and the dissolved oxygen meter, performing subsequent work of exhausting or discharging sewage and gas washing.
Example 2
19 ceramic membranes with the aperture of 0.05um and the porosity of 38 percent are arranged in the dissolved oxygen type ceramic membrane aerator, the pipeline is connected, and a valve flowmeter and a pressure gauge are connected. Open feed liquor valve and play liquid valve, slowly feed liquor through delivery pump by feed liquor pipeline through check valve, feed liquor valve and first manometer, control inlet velocity is not more than 2m/s, treats that the feed liquid is full of the aerator, when having liquid to flow out from going out the liquid valve, observes the reading of second manometer and does not exceed 0.2MPa, closes out the liquid valve. And simultaneously, opening an air inlet valve, slowly introducing air, pressurizing until the reading of a first pressure gauge is 0.5MPa, maintaining the pressure for 30s, adjusting the liquid containing the oxygen-enriched microbubbles to the required flow and pressure by a liquid outlet valve, and discharging the liquid out of the aerator. And the difference value between the first pressure gauge and the second pressure gauge is controlled not to exceed 0.2MPa in the process. The bubbles can be seen from the sight glass to be micron-sized, uniform in size and uniform in distribution, and the reading of the bubble is 40.3mg/L when the bubble is read from the dissolved oxygen tester. And after recording the data of the pressure gauge, the flowmeter and the dissolved oxygen amount, performing subsequent work of exhausting or discharging sewage and gas washing.
Example 3
19 ceramic membranes with the pore diameter of 0.005um and the porosity of 33 percent are arranged in the dissolved oxygen type ceramic membrane aerator, the pipeline is connected, and a valve flowmeter and a pressure gauge are connected. Open feed liquor valve and play liquid valve, slowly feed liquor through delivery pump by feed liquor pipeline through check valve, feed liquor valve and first manometer, control inlet velocity is not more than 2m/s, treats that the feed liquid is full of the aerator, when having liquid to flow out from going out the liquid valve, observes the reading of second manometer and does not exceed 0.2MPa, closes out the liquid valve. And simultaneously, opening an air inlet valve, slowly introducing air, pressurizing until the reading of a first pressure gauge is 0.8MPa, maintaining the pressure for 30s, and adjusting the liquid containing the oxygen-enriched microbubbles to the required flow and pressure by a liquid outlet valve to discharge the liquid out of the aerator. And the difference value between the first pressure gauge and the second pressure gauge is controlled not to exceed 0.2MPa in the process. The bubbles can be seen from the sight glass to be micron-sized, uniform in size and uniform in distribution, and the reading of the bubble is 64.5mg/L when the bubble is read from the dissolved oxygen tester. And after recording the data of the pressure gauge, the flowmeter and the dissolved oxygen amount, performing subsequent work of exhausting or discharging sewage and gas washing.
Claims (8)
1. A method for utilizing an oxygen-enriched ceramic membrane aeration device for aeration is characterized in that: the oxygen-enriched ceramic membrane aeration device comprises a shell, a sealing mounting plate and a ceramic membrane tube; the sealing mounting plate comprises an upper sealing mounting plate and a lower sealing mounting plate which are oppositely arranged, and the upper sealing mounting plate and the lower sealing mounting plate are respectively mounted at the top and the bottom in the shell; more than one ceramic membrane tube is arranged, the top of each ceramic membrane tube is arranged on the upper sealing mounting plate, the bottom of each ceramic membrane tube is arranged on the lower sealing mounting plate, and sealing rings are arranged between the top of each ceramic membrane tube and the upper sealing mounting plate and between the bottom of each ceramic membrane tube and the lower sealing mounting plate; a liquid inlet pipeline is arranged at the bottom of the shell below the lower sealing mounting plate, a check valve, a liquid inlet valve and a first pressure gauge are arranged on the liquid inlet pipeline, the check valve is arranged at the upstream of the liquid inlet valve, a liquid outlet pipeline is arranged at the top of the shell above the upper sealing mounting plate, and a second pressure gauge and a liquid outlet valve are arranged on the liquid outlet pipeline; the part between the upper sealing mounting plate and the lower sealing mounting plate on the shell is a penetration part, the top of one side of the penetration part is provided with an air inlet pipeline, the air inlet pipeline is provided with an air inlet valve, the bottom of the other side of the penetration part is provided with an exhaust sewage discharge pipeline, and the exhaust sewage discharge pipeline is provided with a discharge valve;
the method for aerating by using the oxygen-enriched ceramic membrane aeration device comprises the following steps:
1) liquid feeding: opening a liquid inlet valve and a liquid outlet valve, enabling liquid to enter the ceramic membrane tube from a liquid inlet pipeline, controlling the liquid inlet speed to be not more than 2m/s, enabling the reading of a second pressure gauge to be not more than 0.2MPa, and closing the liquid outlet valve after the ceramic membrane tube is filled with the liquid;
2) dissolving gas: opening an air inlet valve, slowly introducing air for pressurization, keeping the pressure stable for 25-35 s when the reading of a first pressure gauge reaches 0.3-1 MPa, opening a liquid outlet valve, and discharging liquid containing oxygen-enriched microbubbles;
3) and (3) blowdown: closing the air inlet valve and the liquid inlet valve, and opening a discharge valve on the exhaust sewage discharge pipeline for sewage discharge;
4) air washing: and closing the liquid inlet valve and the discharge valve on the exhaust sewage discharge pipeline, opening the gas inlet valve and the liquid outlet valve, and introducing gas from the gas inlet pipeline again to purge the ceramic membrane tube.
2. A method of aeration according to claim 1, characterized in that: the first pressure gauge is arranged at the downstream of the liquid inlet valve.
3. A method of aeration according to claim 1 or 2, characterized in that: and a second pressure gauge, a liquid outlet valve, a flowmeter, an output pressure gauge, a sight glass and a dissolved oxygen determinator are sequentially arranged on the liquid outlet pipeline from upstream to downstream.
4. A method of aeration according to claim 1 or 2, characterized in that: the shell is a high-pressure resistant container; all the ceramic membrane tubes are placed in parallel.
5. A method of aeration according to claim 1 or 2, characterized in that: more than two layers of O-shaped sealing rings are arranged between the top of the ceramic membrane tube and the upper sealing mounting plate and between the bottom of the ceramic membrane tube and the lower sealing mounting plate.
6. A method of aeration according to claim 1 or 2, characterized in that: the ceramic membrane tube is made of aluminum oxide, zirconium oxide, titanium oxide or silicon carbide, the aperture of the ceramic membrane tube is 5 nm-1 um, and the porosity is 30-60%.
7. A method of aeration according to claim 1 or 2, characterized in that: the gas used for air inlet in the step 2) is oil-free compressed air; and the difference value between the first pressure gauge and the second pressure gauge is controlled not to exceed 0.2MPa in the whole gas dissolving process.
8. A method of aeration according to claim 1 or 2, characterized in that: more than two oxygen-enriched ceramic membrane aeration devices are connected in parallel to form an oxygen-enriched ceramic membrane aeration device combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010344056.4A CN111499014B (en) | 2020-04-27 | 2020-04-27 | Method for aerating by using oxygen-enriched ceramic membrane aeration device |
Applications Claiming Priority (1)
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| DE3227671A1 (en) * | 1982-07-23 | 1984-01-26 | Reinhart von Dr.-Ing. 8011 Solalinden Nordenskjöld | Aeration element for feeding air or oxygen into the waste water of purification plants or into natural waters |
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| CN203269611U (en) * | 2013-04-08 | 2013-11-06 | 中国海洋石油总公司 | Micro-fine bubble generator for sewage air floatation treatment and micro-fine bubble generation system |
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