KR20030072179A - Submersible Aerator with the Function of Intermittent Aeration, Deoderization and Air Priming - Google Patents

Abstract

PURPOSE: Provided is a submersible aerator without causing secondary pollution, being capable of increasing treatment efficiency due to water temperature rise, reducing construction cost and increasing aeration power efficiency. CONSTITUTION: The aerator comprises an ejector(1) with an air supply pipe(11), which is installed shallow in wastewater in a reactor, an aeration flow guide pipe(2) connected to the ejector(1) and vertically arranged in the wastewater for guiding air supplied by the ejector deep into the wastewater, and a liquid transportation device(2,2a) with an inlet(18a) and an outlet(19a), wherein air in compressed liquid phase is injected to the aeration flow guide pipe(2) by the ejector(1) so as for the air to be guided to deep into the wastewater and distributed deep into the wastewater through the liquid transportation device(2,2a).

Description

Submersible Aerator with the Function of Intermittent Aeration, Deoderization and Air Priming}

The present invention relates to an underwater aeration device that realizes an intermittent aeration that can efficiently remove nitrogen and phosphorus in sewage at the same time, is easy to maintain, has a deodorizing function, and is capable of silent operation.

In order to remove the pollutants in the sewage, it is very important to select the aeration device that is free from secondary pollution such as noise and vibration, and has excellent efficiency and easy operation and management. However, the conventional abandonment device has a low power efficiency, noise and vibration occurs as described in the following description, and there was a problem of economical.

Conventional surface aerators supply air to the reactor and perform agitation so that the activated sludge can be suspended in the water without being precipitated at the bottom of the reactor, causing the secondary liquid to be scattered into the atmosphere and generating noise. As the water temperature is lowered due to the increase in the amount of evapotranspiration, the growth and activity of temperature-sensitive nitrifiers are lowered and the treatment efficiency is lowered in winter.

Conventional acid type aeration device is composed of a blower and air supply pipe, a diffuser for supplying air to the aeration tank, and because it takes a blower operation structure is uneconomical in terms of facility costs and power costs and complicated maintenance. In particular, the blower generates a lot of noise and vibration, and the heat generated by the electric motor and the air are mostly released into the atmosphere, and thus, the blower does not contribute much to the rise in the water temperature and is wasted.

There is a problem similar to the diffuser type aeration device in the combination apparatus of the conventional type underwater blower and blower in which the diffuser is replaced with the underwater blower.

Conventional air self-absorption aeration device is not available in a deep reaction tank because it does not provide sufficient negative pressure for air self-absorption and lack of air self-absorption depth.

Odor generation is inevitable in the sludge concentration tank, the digestion tank, and the dehydrator constituting the wastewater treatment facility, but the conventional aeration devices except the air-suction type aeration system are difficult to inhale the odor-containing air into the reaction tank for biological deodorization.

The conventional pump ejector aeration device shown in Figure 1 has no droplets scattered, silent operation is performed quietly, all of the heat generated by the motor is transferred to the water body, so that the water temperature rises, it is advantageous for cultivating microorganisms, odor air inhalation Deodorization function is provided and by the simple structure and operation by the air supply valve can also ensure the intermittent aeration function. However, the pump ejector is uneconomical due to excessive power consumption due to self-absorption of air having a small specific gravity and a compressive fluid through the air supply pipe to the deep depth by using an ejector, which is a kind of low-efficiency jet pump. Unlike an underwater stirrer that directly agitates the reaction solution, the reaction solution is indirectly agitated by the jetted water stream, and thus the use of the reaction solution is avoided in spite of many other advantages due to low stirring power efficiency.

Therefore, the present invention has been devised to solve the above-described problems, and secondary pollution such as noise vibration and droplet scattering does not occur, and all of the calorific value of the device is transferred to the reaction liquid, and the treatment efficiency is improved by increasing the water temperature. The cumbersome air supply pipes are omitted, and the building structure is reduced because the blower building is unnecessary, and the purpose is to provide an underwater aeration device equipped with intermittent aeration, deodorization, and air self-absorption.

In the present invention, there is no scattering of the droplets, silent operation is achieved, and the above-mentioned object is realized by utilizing the advantages of the aeration device by the ejector having a simple structure and improving the disadvantage of low aeration power efficiency.

When the pressure decreases, the ejector aeration device of the conventional method in which air, which is a compressive fluid whose volume expands and whose specific gravity decreases, is sucked to a deep depth by using the negative pressure formed by the nozzle of the ejector requires excessive aeration power.

Therefore, in the present invention, the ejector is installed so that the air supply pipe communicates with the atmosphere at a shallow depth of the upper part of the reaction tank, and the outlet of the ejector through which the water flow mixed with gas and liquid flows is connected to the aeration water induction pipe to the deep depth near the bottom of the reaction tank. To configure the device; The compressed fluid and the small specific gravity air are sucked up to the shallow depth by using the ejector, and the air sucked up to the shallow depth by the ejector is faster than the floating speed of the air bubbles formed inside the abandoned water flow guide by the liquid transfer means. By using the incompressible and high specific gravity flow of the reaction liquid, it is forcibly transported to the deep depth and ejected from the deep depth of the lower part of the reactor, so that the air bubble length is increased and the water pressure acting on the interface is increased. Improved power efficiency

In the present invention, air is supplied to the reaction tank by means of liquid transfer means by a turbine pump, such as a centrifugal pump, an axial pump or a four-flow pump, and an agitator which directly stirs the reaction liquid by a rotary blade further combines with aeration and stirring. By constructing the underwater aeration device to separate the power to save the intermittent aeration and improved the efficiency of stirring power.

In addition, in the present invention, the air intake port inside the ejector is composed of a multi-pipe, and the length of the pipe having a small diameter is made longer to improve the efficiency of the large-capacity ejector.

1 is a conceptual diagram of a conventional abandoned device by the pump ejector,

2 to 6 is a conceptual diagram of the second to fifth embodiments of aeration apparatus according to the present invention,

7 is a conceptual diagram of an ejector according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: ejector 2,2a: aeration flow guide pipe

3,3a: Agitator 4: Turbine pump

11,11a: Air supply pipe 12: Air flow control valve

13 air supply valve 14,14a water flow inlet

15: outlet 16: drive motor

17: rotor blade 18, 18a: suction port

19, 19a: spout 20: casing

21: line mixer 22, 22a: air intake

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

2 is a conceptual diagram of a first embodiment of an underwater aeration apparatus according to the present invention.

The apparatus in this embodiment comprises a casing 20 and a drive motor 16 having an ejector 1 and an inlet 18 and one or more outlets 19 provided with an air supply pipe 11 installed at a shallow depth of the reaction tank. Composed of a rotary blade (17) driven by a) and combined with a stirrer (3) having a water flow suction function to form an underwater aeration device, the suction port of the stirrer installed in the deep depth of the reaction tank and the above The outlet 15 of the ejector is connected to communicate with each other by the aeration water induction pipe 2, the liquid inlet 14 of the ejector is configured to open in the water under the water, the air supply pipe is configured to open to the atmosphere.

When the operation process is described, the aeration air is sucked up by the ejector to the upper portion of the aeration water induction pipe at a shallow depth, and the air sucked into the aeration water induction pipe by the ejector is applied to the water intake function of the stirrer. It is forcibly conveyed through the aeration water induction pipe to the rotor blade in a deep depth by the flow of water faster than the floating speed of the air bubbles formed inside the aeration water induction pipe, the suction water flow containing the bubble is a rotor blade While colliding with and dispersing, it is ejected to the outlet of the stirrer to give up and agitate the reaction tank.

The air supply pipe may be provided with an intermittent aeration function in which the air flow control valve 12 is installed to adjust the air flow rate, and the reaction tank may be abandoned or aeration of aeration may be repeated by installing and opening / closing the air supply valve 13. have.

In addition, the inlet of the air supply pipe is connected to the odor air inlet pipe [not shown], which can introduce odor containing air exhausted from the odor generating source such as the concentration tank and the dehydrator chamber, so as to suck the odor and decompose by the microorganisms in the reaction tank. Biological deodorizing function.

In order to apply the aeration system according to the present invention to a flow control tank or a batch reactor in which the water level is changed, the water inlet pipe of the ejector may be located at a constant depth from the water surface regardless of the water level change of the reaction tank. According to the present invention, it is preferable to configure a flexible tube having a length adjusted according to the present invention or a swing-type tube having a bent portion [not shown], and a known technique used in a conventional treatment water discharger (Decanter) of a batch reactor can be applied.

3 is a conceptual diagram of a second embodiment of an underwater aeration apparatus according to the present invention.

The apparatus in this embodiment combines an ejector 1 equipped with an air supply pipe 11 installed at a shallow depth of the reaction tank and a liquid transfer means by means of a turbine pump 4 such as a centrifugal pump, an axial flow or a four-flow pump. Aeration device is configured, but the inlet port (18a) of the turbine pump and the outlet port (15) of the ejector are connected to each other by aeration flow induction pipe (2), the water inlet 14 of the ejector is underwater in the water The air supply pipe is opened in the atmosphere, and the jet stream of the turbine pump is configured to blow out at a deep depth.

When the operation process is described, the aeration air is sucked up by the ejector to the upper portion of the aeration water induction pipe at a shallow depth, and the air sucked into the aeration water induction pipe by the ejector is moved by the turbine pump. By the flow of the reaction liquid faster than the floating speed of the air bubbles formed inside the aeration flow guide pipe is forcibly conveyed through the aeration water flow guide pipe to a deep depth, the outlet at the end of the aeration flow guide pipe (2a) It relates to an underwater aeration device for abandoning and stirring the reaction tank by the water stream containing the bubbles ejected from.

Here, in the case where the aeration flow induction pipe (2a) after the turbine pump (4) is long, air bubbles are combined with each other while passing through the aeration flow induction pipe to increase the size and the gas-liquid contact interface is reduced to give up aeration efficiency This can be degraded. Therefore, it is preferable to provide a mixing means such as a line mixer 21 or a nozzle in which the air droplets are finely crushed to increase the specific surface area of the air bubbles.

Also in this embodiment, the intermittent aeration and deodorizing function can be added in the same manner as in the first embodiment. By branching the aeration water induction pipe 2a after the turbine pump into a plurality of outlets and having an outlet 19a for each end of the pipe, a rectangular or large-scale reaction tank can be effectively abandoned and stirred.

4 is a conceptual diagram of a third embodiment of an underwater aeration apparatus according to the present invention.

In this embodiment, the stirrer 3a is additionally configured in the aeration water jet outlet 19a of the second embodiment, and the water stream containing air discharged from the aeration water jet outlet collides with and disperses the rotor blades 17 of the stirrer. To give up and stir.

Since the turbine pump 4, which is the liquid transfer means, can be operated with an intermittent aeration by ON-OFF operation, a single liquid transfer means performs aeration and agitation in parallel. The disadvantages of the first or second embodiment can be solved.

In addition, during the aeration of aeration, the operation of the aeration liquid transfer means is stopped and the stirrer directly agitates the reaction liquid by the rotor blades, so that the stirring power efficiency is superior to the indirect stirring of the first or second embodiment using the jet stream. And an air supply valve for intermittent aeration, which is mainly composed of an automatic valve, may be omitted.

5 is a conceptual diagram of a fourth embodiment of an underwater aeration apparatus according to the present invention.

The apparatus in this embodiment combines an ejector (1) with an air supply pipe (11) installed at a shallow depth of the reactor and a liquid transfer means by means of a turbine pump (4), such as a centrifugal pump, an axial or quadrilateral pump. Constituting the aeration apparatus, the discharge port of the turbine pump and the aeration water inlet 14a of the ejector are connected to each other, the air supply pipe is open in the air, the outlet of the ejector is a deep water outlet (19a) ) And the abandoned water flow guide pipe (2).

In describing the operation process, the aeration air is sucked up by the ejector to the upper portion of the aeration water induction pipe at a shallow depth, and the sucked air is forced deeply by the flow of the reaction liquid formed by the turbine pump. By transporting to, to be discharged from the outlet at the end of the aeration water flow induction pipe to abandon and agitate the reaction tank.

In the case where the aeration flow induction pipe 2 is extended, it is preferable to install the line mixer 15 to maintain the aeration efficiency, and intermittent aeration and deodorization in the same manner as in the first or second embodiment. You can add features.

6 is a conceptual diagram of a fifth embodiment of an underwater aeration apparatus according to the present invention.

In this embodiment, the stirrer 3a is additionally configured in the aeration water jet port 19a of the fourth embodiment, and the water stream containing the air jetted from the aeration water jet port collides with and disperses the rotor blades 17 of the stirrer. To give up and stir.

Turbine pump 4 which is the liquid transfer means is operated by intermittent aeration by ON-OFF operation to reduce the power consumption, and by stirring the reaction liquid directly by the rotor blades of the stirrer, stirring power efficiency is excellent and air supply The valve may also be omitted.

7 is a conceptual diagram of a large-capacity ejector with improved efficiency according to the present invention.

The water flow ejected from the nozzle of the ejector acts as a backflow force to the air inlet of the air supply pipe, and this phenomenon is more strongly generated in a large-capacity ejector having a larger diameter of the air inlet. Therefore, under the same conditions of air suction depth, that is, the depth where the ejector is installed, the flow rate of the ejection flow should be increased as the ejector capacity increases.In the condition where the ejection flow rate of the nozzle is the same, the efficiency of the ejector decreases as the ejector capacity increases. The ratio of / primary fluid, i.e., the ratio of air intake / water flow is reduced, resulting in uneconomical scale.

In order to solve this problem, in the present invention, by inserting a small diameter air supply pipe (11a) into the air supply pipe (11) inside the ejector (Ring) of the air inlet (Ring) between the air supply pipe (11) 22 is formed and the small-diameter air supply pipe itself is composed of a double pipe to provide a circular air inlet (22a), the small-diameter air supply pipe (11a) protrudes longer than the outer air supply pipe (11) It was made into a structure. If the flow of water is ejected, the air is sucked from the annular air inlet and the reverse flow is prevented by the small-diameter tube protruding from the annular air inlet. Is inhaled.

In this way, the air intake of the large diameter is composed of a double pipe and divided into a narrow annular pipe and a small diameter pipe so as to save energy of the jet stream to be added to prevent backflow in the single pipe of the large diameter. In addition, the aeration capacity of the large ejector can be improved.

The air inlet is not limited to a double pipe, and the small diameter of the annular air inlet is formed by overlapping a plurality of narrow pipes by protruding as the diameter decreases, thereby realizing a large-capacity ejector having high efficiency.

As described above, the underwater aeration device according to the present invention is provided with a deodorizing function, and secondary pollution such as noise and droplet scattering does not occur, and since the calorific value of the device is transferred to the inside of the reactor, the water temperature is increased to improve the treatment efficiency. No deodorization facilities, blowers and blower buildings are required, which reduces facility costs and construction costs, facilitates maintenance, facilitates the abandonment and agitation of reaction tanks, and facilitates the application of intermittent aeration methods to remove nitrogen and phosphorus. And, in particular, because the efficiency of aeration and agitation power is excellent, it is possible to provide a cheap aeration device.

Claims (11)

The air aeration system consists of an ejector having an air supply pipe installed at an upper shallow depth of the reaction tank, a liquid conveying means provided with an inlet port and an outlet port, and an aeration water induction pipe, and the compressed fluid and the small specific gravity air are shallow by the ejector. The air sucked up to the upper part of the aeration water induction pipe of the water depth, and the air sucked into the aeration water induction pipe is faster than the floating speed of the air bubbles formed by the liquid transfer means, and uses the flow of the reaction liquid which is incompressible and has a large specific gravity. Intermittent aeration and deodorization, air aeration function equipped with air self-absorption, characterized in that the forcing and agitating the reaction tank by forcibly transported and ejected to the bottom depth of the reaction tank. According to claim 1, wherein the liquid transfer means is installed in the deep depth of the lower portion of the reaction tank is a stirrer having a water flow suction function provided with a rotor blade and casing and at least one suction port and a discharge port driven by a drive motor, the outlet of the ejector Is connected to the aeration water inlet pipe to communicate with the suction port of the stirrer, the water inlet of the ejector is installed to open at a shallow depth under the water surface of the reactor, intermittent aeration and deodorization, underwater with air self-absorption Abandonment device. According to claim 1, wherein the liquid transfer means is composed of a turbine pump, the outlet of the ejector is connected to communicate with the suction port of the liquid transfer means and the aeration water induction pipe, the aeration flow discharged from the liquid transfer means is a reaction tank Intermittent aeration and deodorization, air-suction function, characterized in that the outlet of the aeration water inlet pipe to be ejected at a deep depth of the installation, the water inlet of the ejector is installed to open at a shallow depth under the water surface of the reactor Underwater aeration apparatus provided. According to claim 1, wherein the liquid transfer means is composed of a turbine pump, the water inlet of the ejector is connected to communicate with the discharge port of the liquid transfer means, the aeration water discharged from the outlet of the ejector is at a deep depth of the reaction tank Intermittent aeration and deodorization, air aeration function equipped with a self-absorption function, characterized in that to install the outlet of the aeration water flow inlet pipe to the deep water to be ejected. According to claim 1, wherein the air supply pipe is provided with an air supply valve, by opening and closing the air supply valve to operate the intermittent aeration and deodorization, air, characterized in that the reaction tank is operated as an intermittent aeration repetition or aeration of aeration Underwater aeration device equipped with a pressurization function. According to claim 1, wherein the inlet of the air supply pipe intermittent aeration and deodorization, air suction function, characterized in that the inlet air inlet pipe that can suck the odor containing air exhausted from the odor generating source, such as a concentration tank and dehydrator Equipped gun catcher. According to claim 1, wherein the inlet and the ejector irrespective of the change in the water level of the water tank so that the water inlet pipe is a flexible tube that is adjusted in length depending on the water level or the swing-type pipe formed bent portion Underwater aeration device equipped with air suction and intermittent aeration function. The intermittent aeration device and deodorization and air-suction function of claim 3 or 4, wherein the liquid transfer means is turned on and off to operate the intermittent aeration device in which the reaction tank is abandoned or aerated aeration is repeated. Underwater aeration device. 5. The underwater aeration apparatus according to claim 3 or 4, wherein the aeration water induction pipe is provided with a line mixer capable of crushing air bubbles finely. According to claim 3 or 4, wherein an agitator is provided at the outlet of the end of the aeration water induction pipe formed in the deep water of the reaction tank, and the aeration water discharged from the aeration water induction pipe collides with the rotor blades of the agitator. Intermittent aeration and deodorization, characterized in that the aeration and aeration, underwater aeration device equipped with air self-suction function. The air supply pipe inside the ejector is composed of multiple pipes by inserting one or more small air supply pipes so that the annular air inlets overlap each other, characterized in that they protrude stepwise as the diameter decreases. Underwater aeration device equipped with intermittent aeration and deodorization, air self-absorption.