KR20060070642A - Removal apparatus of organic matter and nitrogen using activated oxygen and method thereof - Google Patents

Abstract

The present invention relates to a device for removing organic matter and nitrogen contained in the organic wastewater, the apparatus 100 of the present invention, the waste water inlet pipe 111 and the pure oxygen injection pipe 112 is in communication with one side and the other side, respectively; An aerobic reactor 110 for removing organic substances contained in wastewater through the activated microorganisms activated by pure oxygen and causing nitrification of nitrogen; An anaerobic tank 120 which is denitrified by receiving treated water containing changed nitrate nitrogen through nitrification in an aerobic reactor; And receiving treated water from which nitrogen has been removed through the anaerobic tank and separating the liquid and solid into a liquid and solid, and the treated water is discharged to the outside, and some sludge is composed of a settling tank 130 which is returned to the aerobic reactor and the anaerobic tank, respectively. The present invention has the effect of effectively removing organic matter and nitrogen contained in the organic wastewater by supplying pure oxygen to the aerobic reactor to have a high concentration of microorganisms.

Description

Removal Apparatus of Organic Matter and Nitrogen Using Activated Oxygen and Method Thereof}

1 is a schematic diagram showing the configuration of the organic matter and the nitrogen removal apparatus using pure oxygen according to an embodiment of the present invention,

FIG. 2 is a flowchart illustrating a process of removing organic matter and nitrogen using the apparatus shown in FIG. 1.

  ♠ Explanation of symbols on the main parts of the drawing ♠

100 apparatus 110 aerobic reactor

111: organic wastewater inlet pipe 112: pure oxygen injection pipe

113: pure oxygen return pipe 114: spherical media

120: anaerobic tank 121: supply line

122: spherical medium 130: sedimentation tank

131: treated water outflow pipe 132: sludge return pipe

The present invention relates to a device for removing organic matter and nitrogen contained in organic wastewater, in particular, by using pure oxygen to effectively remove organic matter and nitrogen contained in organic wastewater by supplying pure oxygen to the aerobic reactor to have a high concentration of microorganisms The present invention relates to an organic substance and nitrogen removing device and a method thereof.

High concentrations of organics are generally processed through anaerobic digesters and anaerobic contact processes. Since high concentration organic wastewater contains high concentrations of organic nitrogen and ammonia nitrogen in most cases, the existing aerobic reactor and anaerobic digester alone cannot remove nitrogen.

In nitrification, nitrogen is divided into organic nitrogen, ammonia nitrogen (NH ₄ ⁺ -N), nitrite nitrogen (NH ₂ ^-- N) and nitrate nitrogen (NH ₃ ^-- N). It is converted into ammonia nitrogen by the hydrolysis action, the ammonia nitrogen is converted to nitrite nitrogen by Nitrosomonas as shown in Formula 1, the nitrite nitrogen is converted to nitrate nitrogen by Nitrobacter as shown in Formula 2.

Denitrification is microbial nitrate instead of oxygen (NO ₃ ^-) to the respiration in the anaerobic condition ^- a procedure that uses the like as an electron acceptor reduced to _{NO, N 2 O, N 2} (NO 3 and nitrite (NO ₂₎ -> NO ₂ ^-- >NO-> N ₂ O-> N ₂ ).

Conventionally, it was intended to remove organic matter and nitrogen by supplying air to an aerobic reactor, but it was difficult to secure high concentrations of microorganisms, which made it difficult to treat organic matter and nitrogen contained in wastewater.

Therefore, the present invention has been made to solve the problems of the prior art as described above, by supplying pure oxygen to the aerobic reactor to retain the high concentration of microorganisms organic matter using pure oxygen to effectively remove the organic matter and nitrogen contained in the organic wastewater And to provide a nitrogen removal device and a method thereof.

The apparatus of the present invention for achieving the above object, the waste water inlet tube and the pure oxygen injection tube is connected to one side and the other side, respectively, to remove the organic matter contained in the waste water through the microorganism activated by the injected oxygen, nitrogen An aerobic reactor for causing nitrification reactions; An anaerobic tank supplied with treated water containing nitrate nitrogen changed through nitrification in the aerobic reactor to denitrify and remove nitrogen; And receiving treated water from which nitrogen has been removed through the anaerobic tank and separating the liquid and solid into a liquid and solid, and the treated water is discharged to the outside, and some sludge includes a settling tank which is respectively returned to the aerobic reactor and the anaerobic tank. do.

In addition, the method of the present invention comprises the steps of introducing the wastewater into the aerobic reactor and injecting pure oxygen to remove organic matter contained in the wastewater through the microorganism activated by pure oxygen, and to cause nitrification of nitrogen; Removing nitrogen by receiving a treated water containing nitrate nitrogen which has been changed through nitrification in the aerobic reaction tank from an anaerobic tank and performing denitrification reaction; And receiving the treated water from which the nitrogen has been removed from the anaerobic tank is separated from the settling tank into liquids and solids, and treating the treated water to the outside, and returning some sludge to the aerobic reactor and the anaerobic tank, respectively. do.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the organic matter and nitrogen removal apparatus using pure oxygen according to the present invention and the method will be described in detail.

1 is a schematic diagram showing the configuration of the organic matter and nitrogen removal apparatus using pure oxygen according to an embodiment of the present invention.

The present invention removes organic matter and converts organic nitrogen or ammonia nitrogen to nitrate nitrogen through an aerobic reactor that is filled with a small amount of a spherical medium capable of retaining high concentration microorganisms to remove high concentration organic matter in organic wastewater. And nitrification and release of nitrogen through denitrification in an anaerobic tank filled with a large amount of spherical medium.

Looking at the specific configuration of the device of the present invention as follows. As shown in FIG. 1, the apparatus 100 of the present invention includes an aerobic reactor 110, in which an organic wastewater inlet tube 111 is connected to one side, and an oxygen injection tube 112 is connected to a lower surface thereof, and an aerobic reactor. In the anaerobic tank 120 for denitrifying the nitrate nitrogen changed through nitrification in 110) to release and release nitrogen, and the settling tank 130 for separating the treated water from which nitrogen was removed in the anaerobic tank 120 into liquid and solid. It is composed.

Aerobic reactor 110 is a place to remove the organic matter through the aerobic microorganism and nitrification reaction, the organic wastewater inflow pipe 111 into which the organic wastewater flows in communication with one side, injecting pure oxygen for the growth of high concentration microorganisms The pure oxygen injection tube 112 is in communication with the lower surface. In addition, the aerobic reactor 110 is installed with a pure oxygen carrier pipe 113 for communicating the upper surface of the aerobic reactor 110 and the pure oxygen injection tube 112 so that the remaining pure oxygen can be reused after dissolved. desirable. Therefore, the aerobic reactor 110 is configured in a closed type.

In addition, the inside of the aerobic reactor 110 is filled with a small amount of the spherical medium 114 to form a microbial film on the surface thereof to increase the activity of the microorganism. The spherical medium 114 is input to secure a high concentration of microorganisms, and ensures fluidity of wastewater and the formation of microbial membranes adhered to the surface of the spherical medium is self-regulated and the activity of the microorganisms is enhanced to grow into microorganisms resistant to load fluctuations.

That is, the aerobic reaction tank 110 of the present invention by supplying pure oxygen through the oxygen injection tube 112 in order to efficiently manage the oxygen demand of the microorganisms increased by the spherical medium 114 is introduced therein It is possible to reduce the volume and have a structure in which the pure oxygen discharged outwards is conveyed back to the inside of the pure oxygen carrying pipe 113.                     

At this time, the spherical medium 114 does not necessarily need to be added to the aerobic reactor 110, but is preferably filled with 10% to 20% of the total volume of the aerobic reactor 110 to increase the activity of the microorganism. For example, when the amount of the spherical medium 114 is less than 10%, the amount of adherent microorganisms in the aerobic reactor 110 is reduced, and the activity of the microorganisms is lowered, so that the treatment efficiency tends to decrease, and exceeds 20%. In the case of input, sludge rises due to the increase of the highly filamentous filamentous microorganisms in the aerobic reaction tank 110, and it is difficult to separate the solid and the liquid.

On the other hand, the spherical medium 114 is composed of a plastic material of 8-10mm particle diameter is 10% -20% of the total volume is injected into the aerobic reactor 110. Accordingly, the dependency and independence microorganisms coexist in the aerobic reactor 110, the organic matter is removed by the dependency microorganisms involved, nitrification of the independent microorganisms is involved. That is, by dualizing in a single aerobic reactor 110, the removal of organic matter and the nitrification reaction occur simultaneously.

When air is supplied to the aerobic reactor as in the prior art, dissolved oxygen of about 2 mg / l can be maintained, but when used with pure oxygen as in the present invention, dissolved oxygen of about 4-6 mg / l can be maintained. Therefore, the aerobic reactor 110 according to the present invention automatically installs a sensor so that the dissolved oxygen concentration in the inside is always maintained at about 5 mg / l. It is preferable to configure on / off.

The anaerobic tank 120 receives the treated water containing the nitrate nitrogen changed through nitrification in the aerobic reactor 110 without power through the supply line 121 to denitrify and release nitrogen. The inside of the anaerobic tank 120 is filled with a spherical medium 122 to form a microbial film on its surface to efficiently remove the suspended solids (SS). At this time, the spherical medium 122 does not necessarily need to be added to the anaerobic tank 120, but in order to efficiently remove the suspended solids (SS) it is preferable to fill with 70% to 80% of the total volume of the anaerobic tank 120. Do. For example, when the spherical medium 122 is less than 70%, the removal rate of the suspended solids (SS) rapidly decreases due to desorption of the biofilm formed on the surface of the spherical medium 122, and 80% In the case of excessive input, excessive treatment of the biofilm causes clogging of the treated water, which causes the treatment system to be unbalanced.

The sedimentation tank 130 separates the treated water from which organic matter and nitrogen have been removed into a liquid and a solid through the aerobic reactor 110 and the anaerobic tank 120, and discharges the treated water to the outside through the treated water outlet pipe 131. Sludge necessary for proper management of the high concentration of microorganisms 120 is supplied to the anaerobic tank 120 and the organic wastewater inflow pipe 111 through the sludge conveying pipe 132, respectively.

FIG. 2 is a flowchart illustrating a process of removing organic matter and nitrogen using the apparatus shown in FIG. 1.

1 and 2, organic wastewater is introduced into the aerobic reactor 110 filled with the spherical medium 114 through the organic wastewater inlet pipe 111 and through the pure oxygen inlet pipe 112. Pure oxygen is supplied (S201). Then, the aerobic reactor 110 is attached to the spherical medium 114 to remove the organic matter through the activated aerobic microorganism, and nitrification reaction as shown in Chemical Formula 1, Formula 2 (S202). At this time, the pure oxygen remaining after entering and dissolved in the aerobic reactor 110 is supplied back to the pure oxygen injection tube 112 via the pure oxygen carrier tube 113.

As described above, the treated water containing the nitrate nitrogen changed through the nitrification in the aerobic reactor 110 is supplied to the anaerobic tank 120 through the supply line 121. Then, the anaerobic tank 120 removes and releases nitrogen by denitrifying the nitrate nitrogen, and removes the suspended solids (SS) through the spherical medium 122 filled in the anaerobic tank 120 (S203).

As described above, the treated water from which nitrogen and suspended solids are removed through the anaerobic tank 120 is supplied to the settling tank 130 and separated into a liquid and a solid, and the treated water is discharged to the outside along the treated water outlet pipe 131. Some sludge is supplied to the anaerobic tank 120 and the organic wastewater inlet pipe 111 through the sludge conveying pipe 132 (S204).

Experimental Example

The sample used in this experiment was carried out as follows to confirm the effect of the present invention as a plant wastewater.

The characteristics of the experimental wastewater were chemical oxygen demand (COD) of 500 to 600 mg / l, nitrogen compounds (T-N) of 200 to 300 mg / l, and suspended solids (SS) of 200 to 300 mg / l.

The microbial concentration of the aerobic reactor 110 was maintained at 4000 to 5000 mg / l, and the dissolved oxygen (DO) concentration was maintained at 4 to 6 mg / l, and the treatment was performed for 6 hours, 12 hours and 24 hours. The efficiency was compared and analyzed and the results are shown in Table 1.                     

As can be seen in Table 1, the concentration of the treated water was based on the residence time of 24 hours, the chemical oxygen demand (COD) 50-80mg / l 85-90%, the nitrogen compound (TN) 35-55mg / l 75 80% and suspended solids (SS) were removed from 10 to 20 mg / l, 90 to 95%. Therefore, the present invention was found to be very effective in removing high concentrations of organic matter and nitrogen.

As described in detail above, the present invention has an effect of effectively removing organic matter and nitrogen contained in organic wastewater by supplying pure oxygen to an aerobic reactor to retain high concentration of microorganisms.

In addition, the present invention has the effect of filling the spherical medium in the aerobic reaction tank to activate the high concentration of microorganisms to increase the removal efficiency of the organic matter, the filling of the spherical medium in the anaerobic tank to efficiently remove the suspended matter.

In addition, the present invention is configured to recycle the dissolved dissolved oxygen, not only effective oxygen management, but also by the aerobic reaction tank in the closed type to prevent air pollution by odor, supplying high oxygen through the supply of pure oxygen Since it can be maintained at all times, the area of aerobic reactor is economically reduced.

In the above description of the organic matter and the nitrogen removal device using the pure oxygen of the present invention and the technical details of the method together with the accompanying drawings, but this is illustrative of the best embodiment of the present invention by way of example and not by way of limitation.

In addition, it is obvious that any person skilled in the art can make various modifications and imitations within the scope of the appended claims without departing from the scope of the technical idea of the present invention.

Claims (8)

An aerobic reactor for communicating with the wastewater inlet tube and the pure oxygen inlet tube on one side and the other side, respectively, to remove organic substances contained in the wastewater through the activated microorganisms activated by the injected pure oxygen, and to cause nitrification of nitrogen; An anaerobic tank supplied with treated water containing nitrate nitrogen changed through nitrification in the aerobic reactor to denitrify and remove nitrogen; And Receiving the treated water from which nitrogen has been removed through the anaerobic tank is separated into a liquid and a solid, the treated water is discharged to the outside, and some sludge includes a sedimentation tank to be returned to the aerobic reactor and the anaerobic tank respectively. Oxygen and organic matter removal device using oxygen. According to claim 1, wherein the aerobic reactor is configured in a closed type, one side of the aerobic reactor is further provided with a pure oxygen carrier pipe communicating with the pure oxygen inlet tube to reuse the remaining pure oxygen Organic and nitrogen removal apparatus using pure oxygen, characterized in that. The apparatus for removing organic matter and nitrogen using pure oxygen according to claim 1 or 2, wherein the aerobic reaction tank is further filled with a spherical medium which forms a microbial film on the surface thereof to increase the activity of the microorganism. The organic material and nitrogen removal apparatus using pure oxygen according to claim 3, wherein the spherical medium is filled with 10% -20% of the total volume of the aerobic reactor. According to claim 1 or 2, wherein the aerobic reaction tank is characterized in that the detection sensor is further installed to automatically turn on / off the supply of pure oxygen injected through the pure oxygen injection tube by measuring the dissolved oxygen concentration Organics and nitrogen removal device using pure oxygen. According to claim 1 or claim 2, wherein the anaerobic tank organic matter and nitrogen removal apparatus using pure oxygen, characterized in that further filled with a spherical medium to help remove the suspended solids. The organic material and nitrogen removing apparatus using pure oxygen according to claim 6, wherein the spherical medium is filled with 70% to 80% of the total volume of the anaerobic tank. Introducing wastewater into the aerobic reactor and injecting pure oxygen to remove organic matter contained in the wastewater through microorganisms activated by pure oxygen and causing nitrification of nitrogen; Removing nitrogen by receiving a treated water containing nitrate nitrogen which has been changed through nitrification in the aerobic reaction tank from an anaerobic tank and performing denitrification reaction; And Receiving the treated water from which the nitrogen has been removed from the anaerobic tank is separated into a liquid and a solid, the treated water is discharged to the outside, and some sludge is returned to the aerobic reactor and the anaerobic tank, respectively. Removal method of organic matter and nitrogen using pure oxygen.

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