KR100404690B1 - Apparatus for advanced treatment of water polluted by organic substances - Google Patents

Abstract

The present invention relates to an apparatus for treating wastewater containing organic contaminants, and the apparatus for treating organic contaminated water according to the present invention is a circulation pipe for circulating influent water in a reaction tank, in which a pump is coupled and a flow rate of circulating water flows. Circulatory tube to increase; A blower for supplying air; An air inlet pipe for moving the supplied air; An ejector connected to the circulation pipe and the air inlet pipe, the ejector being positioned in the reactor to generate bubbles in the circulation water; And a treated water drawer which draws the treated water by the level difference, wherein the treated water drawer comprises: a buoy which floats on the surface of the reactor and moves as the level rises and falls; A drawing pipe connected to the buoy to draw the treated water; A rotating elbow installed on the drawing pipe to adjust the position of the buoy; A valve installed at a lower end of the drawing pipe to adjust to recover only the treated water processed through the processes; An automatic valve coupled to the buoy and having a ball therein for opening and closing a drawing tube inlet according to opening and closing of the valve therein; And a vent for drawing out the air remaining inside the drawing pipe to keep the drawing pipe filled with only the treated water.

Description

Apparatus for advanced treatment of water polluted by organic substances}

The present invention relates to an apparatus for treating contaminated water containing organic contaminants. More specifically, the present invention relates to an apparatus for removing wastewater containing organic pollutants, nitrogen and phosphorus by using microbial sludge.

The conventional aeration tank method for removing organic contaminants contained in the waste water is to mix and stir the inflow water supplied in the aeration tank with the sludge water present in the tank at an appropriate ratio so that the contaminants come into contact with the microorganisms in the sludge water. It was decomposed by. When all organic matter was decomposed, it was common practice to transfer the treated water to the settling tank and settle for a certain time.

However, in the conventional method as described above, the compressed air is injected into the water in order to form an aerobic state. This method was able to achieve not only the effect of supplying the dissolved oxygen but also the stirring effect of the sludge water by the air flotation force in water. However, the agitation was only agitation caused by air flotation by the injection of compressed air, and thus its strength was not sufficient. Therefore, the influent may not be in sufficient contact with the sludge, and due to the sludge deposition at the lower portion of the aeration tank, there is a problem in that it is periodically replaced or repaired because the diffuser device is aging or closed. In addition, when the injection of air is stopped to adjust the concentration of dissolved oxygen, the stirring is stopped together, so it is impossible to adjust the concentration of dissolved oxygen without affecting the stirring. When the injection of air is stopped to control the concentration of dissolved oxygen, agitation does not occur and sufficient contact between the influent and the sludge is not possible, and there is a problem in that sludge deposition occurs in the lower part of the aeration tank. Therefore, in order to give an anaerobic condition, there was a burden of separately providing an anaerobic tank in addition to the aeration tank.

In order to supplement the problem of weak stirring power as described above, a method of increasing the stirring effect by increasing the amount of air has been proposed. However, when excess oxygen is supplied, the sludge settleability is poor, there is a problem that the water quality of the treated water is deteriorated. In addition, there is a disadvantage in that a cost burden occurs because the power required to supply excess oxygen is increased.

The present invention is to solve the above problems, an object of the present invention is to stir so that the influent and microbial sludge can be sufficiently contacted in the reaction tank, the dissolved oxygen concentration in the reaction tank without affecting the stirring separately It is to provide a highly advanced method and apparatus for treating organic wastewater. It is also to provide an advanced wastewater treatment system for organic wastewater so that anoxic and aerobic states can be alternately set in a single tank without a separate tank to create an anoxic state. In addition, an object of the present invention is to allow the precipitation process and the treated water recovery process to be carried out alternately with an oxygen-free and aerobic process in a single tank, in particular the operating principle of the treated water drawer used in the treated water recovery process and Its simple configuration reduces the cost of power and construction, further improves the treatment efficiency of organic contaminated water, stabilizes the treated water quality, and provides the advanced treatment device for organic wastewater, which can extend the life of the advanced contaminated water. It is.

1 is a block diagram showing an advanced treatment apparatus for organic polluted water according to the present invention.

Fig. 2 is a schematic diagram showing the mechanism by which the ejector constituting the device of the present invention is connected to the air inlet pipe and the circulation pipe to generate bubbles.

Figure 3 is a schematic diagram showing a treated water drawer used in the apparatus of the present invention for recovering treated water.

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

2: second pump 3: ejector

4: treated water drawer 6: air inlet pipe

7: circulation tube 8: reactor

10: Buoy 11: Auto Swing

12: Rotary Elbow 13: Valve

14: drawing tube 15: ball

In the advanced treatment method of organic polluted water according to the present invention, in the advanced treatment method of organic polluted water including an anoxic process and an aerobic process, the anoxic process and the aerobic process are alternately performed in a single reactor, and the exhalation process The process of increasing the contact with the sludge by supplying air to the circulating water in the reaction tank and agitating the circulating water by allowing the circulating water whose flow rate is increased by the pump installed in the circulating pipe to pass through the ejector into which the air is sucked. The anoxic step is a step of adjusting only the air so as not to be sucked from the ejector and allowing only stirring without providing air to the circulating water.

The method for treating organic polluted water further includes a precipitation step after the anoxic process and an aerobic process, and the precipitation process is performed in the reaction tank in which the anoxic and aerobic processes are performed, and passes through the anoxic process and the aerobic process. A process of separating circulating water from which organic contaminants have been removed is treated water and sludge using gravity in the reactor.

The method for highly treating organic polluted water further includes a treated water recovery process after the anoxic process, an aerobic process, and a precipitation process, and the treated water recovery process includes a treated water separated through the precipitation process, and gravity It is drawn from the surface of the reactor using the.

In the high-level treatment method of the organic polluted water, the drawing is buoys floating on the water surface in the reactor while moving in accordance with the rise and fall of the water level; A drawing pipe connected to the buoy to draw the treated water; A rotating elbow installed on the drawing pipe to adjust the position of the buoy; A valve installed at a lower end of the drawing pipe to adjust to recover only the treated water processed through the processes; An automatic valve coupled to the buoy and having a ball therein for opening and closing a drawing tube inlet according to opening and closing of the valve therein; And a vent for drawing air remaining inside the draw tube to maintain the draw tube filled with treated water only.

An advanced treatment apparatus for organic polluted water according to the present invention includes a circulation pipe for circulating inflow water in a reaction tank, the circulation pipe being coupled with a pump to increase the flow rate of the circulation water; A blower for supplying air; An air inlet pipe for moving the supplied air; An ejector connected to the circulation pipe and the air inlet pipe, the ejector being positioned in the reactor to generate bubbles in the circulation water; And a treated water drawer which draws the treated water by the level difference, wherein the treated water drawer comprises: a buoy which floats on the surface of the reactor and moves as the level rises and falls; A drawing pipe connected to the buoy to draw the treated water; A rotating elbow installed on the drawing pipe to adjust the position of the buoy; A valve installed at a lower end of the drawing pipe to adjust to recover only the treated water processed through the processes; An automatic valve coupled to the buoy and having a ball therein for opening and closing a drawing tube inlet according to opening and closing of the valve therein; And a vent for drawing out the air remaining inside the drawing pipe to keep the drawing pipe filled with only the treated water.

Before describing the present invention in detail, the following terms used in the present invention are defined as follows for clarity.

The term "circulating water" refers to the influent from the influent flowing into the reactor for advanced treatment until it is separated by sedimentation after entering the circuit for circulation.

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

1 is a block diagram showing an advanced treatment apparatus for organic polluted water according to the present invention.

One of the features of the present invention is that a single bath simultaneously serves as an anaerobic tank, aerobic tank and settling tank. In the device according to the invention, the air inlet pipe 6 connected to the blower 5 and the circulation pipe 7 from the reaction tank are coupled with the ejector. Inflow water supplied from the sump (9) into the reactor (8) by the first pump (1) is supplied to the ejector (3) again by the second pump (2), while air is introduced into the air from the blower (5). It is fed to the ejector 3 along the tube 6. The circulating water from the second pump 2 installed in the circulation pipe has a very fast flow rate. When the fast flow rate of circulating water passes through the ejector 3, the flow rate becomes faster at the bottleneck portion in the center of the ejector 3. When a vacuum is formed due to the high speed pressure, air is sucked into the ejector 3 from the air inlet pipe 6 connected to the ejector 3. This produces fine bubbles in the circulation water. With the generation of bubbles, as the circulating water is supplied at a high speed by the second pump 2, sufficiently strong stirring occurs in the reaction tank 8. Therefore, a proper stirring effect and an oxygen supply effect can be performed simultaneously. In this way, the reaction tank is aerobic, and the ammonia nitrogen (NH ₄ -N) present in the reaction tank 8 becomes nitrite nitrogen (NO ₂ -N) by nitrite bacteria such as Nitrosomonas . Then, it is oxidized to nitric acid nitrogen (NO ₃ -N) by nitric acid bacteria such as Nitrobacter . It is preferable that the capacity of the reactor is about 24 hours on the basis of daily sewage, and the number of times of daily repetition is about four times.

In order to prepare the reactor 8 in an oxygen-free state, the following method is used. It is preferable to remove the contaminants contained in the contaminated water and pretreatment to homogenize the water quality before supplying the organic contaminated water to the reactor 8. The capacity of the reaction vessel during pretreatment is planned to be about 8 to 12 hours, and the aeration intensity is preferably set to 0.5 to 1.0 m ₃ / m ₃ hr. The pretreated influent is fed into the reactor 8 through the first pump 1. At this time, the oxygen-free state is maintained only when the valve attached to the air inlet pipe 6 connected to the ejector 3 in the reactor 8 is locked. When the valve is locked, even though the circulating water reaches the ejector 3 at a high speed through the second pump 2, air is not introduced, so bubble generation is blocked. Therefore, the reactor 8 is maintained in an oxygen free state. In order to measure the dissolved oxygen concentration in the reactor, the dissolved oxygen concentration in the reactor is adjusted together with the valve by installing a dissolved oxygen concentration meter in the reactor. The concentration of dissolved oxygen is adjusted from a maximum of 3.0 mg / l to a minimum of 0.0 mg / l. When the dissolved oxygen concentration is 0.0 mg / l, the reactor 8 is formed in an oxygen free state. Nitrous acid (NO ₂ ) and nitric acid (NO ₃ ) are converted to nitric oxide (NO) in the anoxic reactor (8), and then reduced to dinitrogen oxide (N ₂ O), which eventually becomes nitrogen gas (N ₂ ). Fly to the middle. Bacteria that play this role are denitrifying bacteria, such as Bacillus, Pseudomonas, Acrobacter, Micrococcus and the like. These bacteria are organotrophic and require organic carbon, a separate hydrogen donor. However, the present invention causes denitrification using BOD contained in the pretreated contaminated water supplied in an anoxic state without adding an additional organic carbon source. Moreover, the present invention maximizes the nitrogen removal effect by simultaneously causing denitrification by endogenous respiration by microorganisms.

As described above, the present invention does not require an aerobic tank and an anoxic tank separately, and thus can form an aerobic state and an anoxic state in a reaction tank, thereby treating nitrogen contained in the organic wastewater simply and inexpensively. In addition to the removal of nitrogen as described above, the present invention alternately forms an aerobic state and an anoxic state, so that the microorganisms of the sludge are induced to overingest and discharge phosphorus, thereby simultaneously removing phosphorus. In addition, by alternately repeating the anaerobic and aerobic states, the microorganisms in the sludge become more resistant, thereby increasing the viability of the microorganisms. This makes the sludge resistant to impact loads caused by external factors. In addition, since the oxygen intake rate of the microorganism is more than doubled compared to the general aerobic conditions, the amount of air required for the conventional aerobic tank is greatly reduced, thereby reducing power consumption.

After the organic contaminants are removed through the anoxic and aerobic states, the first pump 1 and the second pump 2 are stopped and the reaction tank 8 performs the function of the settling tank. The sludge ingesting excess phosphorus by the gravity difference sinks to the bottom of the reactor and the treated water moves to the top of the tank and is separated.

The separated highly treated water is drawn through the treated water drawer (4). In the exhalation and anoxic stage, the treated water drawer 4 is locked so that the inlet of the drawing tube is blocked to prevent the discharge of pollutants through the drawer, and the treated water can be withdrawn after all organic treatment is completed. At this time, the valve 13 opens and serves to draw the treated water by the gravity difference.

Some of the sludge deposited in the lower part of the reactor 8 after the treatment water drawing step is transferred to the sludge reservoir as a surplus sludge by a mixed liquor suspended solids (MLSS) concentration meter to keep the MLSS concentration of the reactor 8 constant.

2 is a schematic diagram showing a mechanism in which the ejector constituting the apparatus of the present invention is connected to the air inlet pipe and the circulation pipe to generate bubbles in the circulating water.

In the apparatus according to the present invention, the air inlet pipe 6 and the circulation pipe 7 connected to the blower 5 are coupled to the ejector. Inflow water supplied from the sump (9) into the reactor (8) by the first pump (1) is supplied to the ejector (3) again by the second pump (2), while air is introduced into the air from the blower (5). It is fed to the ejector 3 along the tube 6. The circulating water from the second pump 2 has a high flow rate. When the fast flow rate of circulating water passes through the ejector 3, the flow rate becomes faster at the bottleneck portion in the center of the ejector 3. When a vacuum is formed due to the high speed pressure, air is sucked into the ejector 3 through the air inlet pipe 6 connected to the ejector 3. This produces fine bubbles in the circulation water.

Figure 3 is a block diagram showing a drawing machine for recovering the treated water by configuring the apparatus of the present invention.

The treated water drawer 4 includes a buoy 10, an automatic opening 11, a drawing tube 14, a rotating elbow 12 and a valve 13. The automatic opening 11 has a ball 15 therein. The buoy 10 floats on the surface of the water while moving in accordance with the rise and fall of the water level, so that the automatic opening 11 is always located about 450 mm below the water surface. The treated water extractor 4 is maintained in a state of being filled with the treated water moved up in the settling step to the rear end of the valve 13 through the drawing tube. After that, when the valve 13 is opened, the treated water inside the drawing pipe 14 is discharged due to the water level difference. As a result, the ball 15 embedded in the automatic opening 11 is raised, and thus the inlet of the drawing tube is opened, and thus the treated water in the reaction tank 8 is drawn out through the treated water drawer 4. When the valve 13 is locked after most of the treated water is drawn, the ball 15 embedded in the automatic valve 11 is lowered by gravity to close the inlet pipe 14. Therefore, in the state in which the valve 13 is locked, the substance in the reactor 8 does not enter the drawing tube 14. In the anaerobic and aerobic agitation rather than the precipitation step, the valve 13 is locked to prevent contaminants from entering the draw tube 14. Since the rotating elbow 12 is rotatable, the buoy 10 serves to adjust so that it can be located at an appropriate place. In addition, the buoy 10 can be raised or lowered smoothly according to the change in the water level in the reactor (8). The treated water extractor 4 according to the present invention is preferably provided with a vent. Although the vent is not shown in the figure, the vent serves to draw out the air remaining inside the draw tube 14 so that the draw tube 14 is filled with only treated water. If only the treated water is filled without remaining air, the negative pressure is reliably maintained in the pipe when the valve 13 is opened.

As described above, the present invention has the following effects. First, since the reaction tank used in the present invention is a multifunctional tank that serves as both an aerobic tank, an anoxic tank, and a precipitation tank, the organic wastewater can be easily and inexpensively treated. Second, by increasing the contact between sludge and contaminants in a manner that combines the functions of the pump and the ejector, it is possible to reduce the capacity of the tank and stabilize the treated water quality. Third, because only the optimal amount of air can be supplied in the tank can reduce the power and construction costs. Fourth, by repeating the anaerobic and aerobic state alternately to increase the resistance to microorganisms, the viability is increased and the impact load caused by external factors. In addition, it is possible to reduce the amount of excess sludge by endogenous breathing and anaerobic function. Fifth, since the oxygen intake rate of the microorganism is more than doubled compared to the conventional aerobic conditions, it is possible to reduce the cost of air supply. Sixth, the combination of the valve and the ejector can reduce the growth of filamentous bacteria, so that sludge with good agglomeration and sedimentation can be obtained, and the aging and closing of the diffuser can be prevented. In addition, the present invention, the operation principle and configuration of the treatment water drawer used in the treatment water recovery process can be simplified to reduce the power and construction costs, further improve the treatment efficiency of organic contaminated water, stabilize the treatment water quality This can extend the life of the advanced treatment system for organic contaminated water.

Claims (7)

delete delete delete delete A circulation pipe for circulating influent water in a reaction tank, comprising: a circulation pipe coupled with a pump to increase a passage flow rate of the circulation water; A blower for supplying air; An air inlet pipe for moving the supplied air; An ejector connected to the circulation pipe and the air inlet pipe, the ejector being positioned in the reactor to generate bubbles in the circulation water; And It is configured to include a treated water drawing machine for drawing the treated water by the water level difference, The treated water drawer, A buoy which floats on the surface of the reactor and moves as the level rises and falls; A drawing pipe connected to the buoy to draw the treated water; A rotating elbow installed on the drawing pipe to adjust the position of the buoy; A valve installed at a lower end of the drawing pipe to adjust to recover only the treated water processed through the processes; An automatic valve coupled to the buoy and having a ball therein for opening and closing a drawing tube inlet according to opening and closing of the valve therein; And And an air vent for drawing the remaining air inside the drawing pipe to keep the drawing pipe filled with treated water only. delete delete