KR100636293B1 - Nitrogen and phosphorus removal apparatus with zero power consumption inner recycle and method thereby - Google Patents

Abstract

The nitrogen-phosphorus treatment apparatus using the non-powered internal circulation according to the present invention is an internal circulation apparatus including a bioreactor for removing organic matter in sewage or nutrients including nitrogen or phosphorus, wherein the bioreactor is internal By an anaerobic tank which is divided into a first part and a second part by a partition, and an anaerobic tank formed in the said 1st part, and the overflow wall formed in the said 2nd part and spaced inwardly from the opposing outer side wall of the said bioreactor by predetermined distance. And an anaerobic tank which is partitioned and formed between the outer wall of the bioreactor and the overflow wall and includes a baffle for controlling the flow of fluid in the front end portion, wherein the anaerobic tank is combined with an inflow pipe into which sewage or sludge flows. It includes an agitator therein, the partition wall partitioning the anaerobic tank and the anoxic tank includes a plurality of holes, the overflow wall is high Is lower than the outer wall of the bioreactor, the passage is formed at a predetermined interval on the upper, the aerobic tank is connected to the blower on the lower surface is characterized in that the micro-bubble air generating device coupled to generate a micro bubble, the internal circulation pump It is possible to reduce maintenance costs and energy by providing a nitrogen / phosphorus treatment device using a non-powered internal circulation that can transfer sewage from an aerobic tank to an anaerobic tank without installing a separate gas.

 Non-powered internal circulation, bioreactor, nitrogen / phosphorus treatment equipment.

Description

 Nitrogen and phosphorus removal apparatus with zero power consumption inner recycle and method hence}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side sectional view schematically showing the structure and processing flow of a conventional nitrogen / phosphorus treatment apparatus.

Figure 2 is a side cross-sectional view schematically showing the structure and processing flow of the nitrogen phosphorus treatment apparatus according to a preferred embodiment of the present invention.

3 is a plan view of a nitrogen-phosphorus treatment apparatus according to a preferred embodiment of the present invention.

4 is a sectional view taken along the line A-A of FIG.

5 is a cross-sectional view taken along line B-B in FIG.

6 is an enlarged view of a portion C of FIG. 5;

7 is a process flowchart schematically showing a nitrogen-phosphorus treatment method according to a preferred embodiment of the present invention.

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

100: sewage inflow 200: anaerobic tank 210: stirrer

300: anoxic tank 310: stirrer 320: porous baffle

330: baffle 340: outer wall

400: aerobic tank 410: internal transfer pump 420: fine bubble diffuser

430: blower 440: microbubble 450: overflow wall

460: passage 470: water level baffle

500: final settlement 510: sludge collector 520: external conveying pump

530: surplus sludge drawing pump

600: treated water

The present invention relates to a nitrogen-phosphorus treatment apparatus, and more particularly to a nitrogen-phosphorus treatment apparatus and method using a non-powered internal circulation.

In biological sewage and wastewater treatment methods, nitrogen and phosphorus generally act as essential nutrients for protein and nucleic acid synthesis for the activity and proliferation of microorganisms. However, when nutrients such as nitrogen and phosphorus are contained in the water, water pollution is caused due to the eutrophication caused by the rapid reproduction of autotrophic microorganisms such as algae, and the use value is significantly reduced. Due to this effect, the recent sewage treatment is introducing a biological treatment process capable of removing nitrogen and phosphorus.

Nitrogen removal process, one of the major processes of biological treatment process, is largely anerobic, and it is anoxic for nitrate nitrogen produced by nitrification and nitrification which converts organic nitrogen or ammonia nitrogen into nitrate nitrogen in aerobic and wastewater. It is divided into denitrification reaction which converts into nitrogen gas in the state, and nitrogen is removed from sewage and wastewater through these two processes.

In the phosphorus removal process, organic phosphorus accumulates in the cells in the form of phosphates in the aerobic state, and is released in the form of phosphates out of the microorganisms in the anaerobic state. Accumulate in the wastewater and discharge the microorganisms ingesting excessively phosphorus to the excess sludge to remove the phosphorus in the sewage and wastewater.

In general, the nitrogen-phosphorus treatment apparatus generally adopts a method of transferring nitrified nitrate nitrogen to an oxygen-free tank by using an internal circulation pump to denitrify and remove it. Therefore, the most commonly used internal circulation pump transfer method requires the installation of a large-capacity pump, which increases the initial investment cost of the sewage treatment plant and maintains the pump continuously. need.

Figure 1 is a side cross-sectional view schematically showing the structure and processing flow of a conventional nitrogen and phosphorus treatment apparatus, the anaerobic tank 100 discharges a large amount of phosphorus and from the aerobic tank 400 to the oxygen-free tank 300, the internal circulation pump 410 The structure and treatment method are shown to remove nitrogen components by transporting and nitrifying sewage which is nitrified by).

Referring to FIG. 1, the internal circulation pump 410 introduces a liquid in the nitrified aerobic tank into an anoxic tank, transfers 100% to 200% of the sewage amount, and converts the nitrate nitrogen to nitrogen gas sufficiently to be treated. .

Since the internal circulation pump 410 has a large flow rate that circulates, a large capacity pump must be installed, and at the same time, a large amount of power requires a large installation cost and energy.

In addition, there is a problem in that replacement of consumables such as bearings and maintenance costs according to the operation of the internal circulation pump.

As a related art of a conventional nitrogen / phosphorus treatment system apparatus, Korean Patent Publication No. 10-0390633 ('Anoxic / anaerobic continuous batch reaction apparatus and a biological nitrogen removal method using the same') may be mentioned.

The present invention is an anoxic tank in which the denitrification of nitrate nitrogen proceeds in anoxic state and a mixer or a plurality of partition walls are formed therein; An anaerobic tank into which the wastewater passed through the anaerobic tank is introduced, and phosphorus release reaction by microorganisms is progressed in an anaerobic state, and a mixer or a plurality of partition walls are formed therein; It consists of two sequencing batch reactors in which sewage and wastewater passed through the anaerobic tank are separated and introduced, and organic residues remaining, nitrification and excess ingestion of phosphorus are performed, and each continuous batch reactor is discharged of treated water. Floating decanter and a bulkhead and a hopper for concentrating the mixed liquid of the continuous batch reaction tank is installed, but the conveying pump to convey the mixed liquid from the anaerobic tank to the anoxic tank, or the continuous batch reaction tank to the anoxic tank. Because of the structure to be used, the maintenance cost of the power unit is required for internal circulation and there is a problem in terms of energy saving.

Therefore, an object of the present invention is to overcome the drawbacks of the prior art as described above, nitrogen and phosphorus treatment apparatus and method using a non-powered internal circulation that can transfer sewage from an aerobic tank to an oxygen-free tank without installing an internal circulation pump separately. To provide.

Another object of the present invention is to structurally improve the problems caused by the existing internal circulation pump installation, to replace the existing nitrogen-phosphorus treatment method, and to reduce the installation cost and maintenance costs of the agitator of the internal circulation pump and an oxygen-free tank, the power-free internal A nitrogen and phosphorus treatment apparatus and method using circulation are provided.

According to a preferred aspect of the present invention to achieve the above technical problem, in the internal circulation device including a bioreactor for removing organic matter in the sewage or nutrients including nitrogen or phosphorus, the bioreactor is An anaerobic tank partitioned into a first part and a second part by an internal partition wall, and an overflow wall formed in the second part and spaced apart from the outer wall facing each other of the bioreactor by a predetermined distance inwardly. And an anaerobic tank defined by an aerobic tank partitioned by the outer wall of the bioreactor and the overflow wall and including a baffle for controlling the flow of fluid in the front end portion, wherein the anaerobic tank includes an inlet pipe into which sewage or sludge flows. Combined and included therein a stirrer, partition wall partitioning the anaerobic tank and the anoxic tank includes a plurality of holes, The airflow wall has a height lower than that of the outer wall of the bioreactor, and a passage is formed at a predetermined interval on the upper side, and the aerobic tank is connected to the air blower on the lower surface to combine the microbubble gas generating device to generate microbubbles. A nitrogen / phosphorus treatment apparatus using a non-powered internal circulation is provided.

It is preferable to further include a water baffle for adjusting the flow rate is coupled to the passage and is transferred from the aerobic tank to the anoxic tank.

Nitrogen-phosphorus treatment apparatus using the non-powered internal circulation is preferably characterized in that the bioreactor structure to remove organic matter and nitrogen, phosphorus and other nutrients in the sewage through an anaerobic tank-anoxic tank-aerobic tank.

Further, in the nitrogen / phosphorus treatment method for removing nitrogen and phosphorus from sewage, including organic matter, the sewage is discharged to treated water through an anaerobic tank, anoxic tank, and an aerobic tank, and in which sludge is precipitated, (a) the anaerobic tank. Biologically treating the sewage phosphorus by microorganisms in the microorganisms; (b) removing nitrogen from the anaerobic bath; (c) using the microbubbles generated in the microbubble acid apparatus to cause oxidation of organic matter and nitrification of organic nitrogen in the aerobic tank; (d) sedimentation and sedimentation of the sludge in the final settling, wherein in step (c) a part of the sewage is sent back to the anaerobic tank using the water level and the overflow wall raised by the microbubble and denitrated; A part of the sludge is returned to the anaerobic tank, and a nitrogen-phosphorus treatment method using a non-powered internal circulation in which microorganisms are replenished and the rest is discharged is provided.

Hereinafter, with reference to the accompanying drawings will be described in more detail with respect to a preferred embodiment of the nitrogen-phosphorus treatment system apparatus using a non-powered internal circulation according to the present invention.

Figure 2 is a side cross-sectional view schematically showing the structure and processing flow of the nitrogen phosphorus treatment system apparatus according to a preferred embodiment of the present invention, Figure 3 is a plan view of a nitrogen phosphorus treatment system apparatus according to a preferred embodiment of the present invention 4 is a cross-sectional view taken along line AA of FIG. 3. 2 to 4, the sewage inflow 100, anaerobic tank 200, agitator 210, anoxic tank 300, porous baffle 320, baffle 330, outer wall 340, aerobic tank 400 ), Microbubble diffuser 420, blower 430, microbubble 440, overflow wall 450, the final settler 500, sludge collector 510, external conveying pump 520, surplus sludge drawing pump 530, treated water 600 is shown.

Bioreactor is composed of three tanks, anaerobic tank 200, aerobic tank 400, anoxic tank 300 is.

The anaerobic tank 200 is a sewage inflow 100, the sludge precipitated in the final settler is introduced, and the stirrer 210 driven by a motor is installed therein. The anaerobic tank 200 is connected to the anaerobic tank 300, and the partition wall between the anaerobic tank 200 and the anaerobic tank 300 becomes a porous baffle 320 so that the fluid is transferred evenly, and the anoxic tank 300 has a baffle at the front end portion. 330 was installed to smoothly transport to the aerobic tank (400).

In the aeration tank 400, a microbubble diffuser 420 connected to the blower 430 is disposed on the entire surface of the lower aerobic tank so that the microbubbles 440 are ejected, and the baffle 470 between the aerobic tank and the anoxic tank can adjust the height. It is designed to control the internal circulation according to the outflow water level. The anaerobic tank 100 releases a large amount of phosphorus and removes nitrogen by removing nitrified sewage by internal circulation from the aerobic tank 400 to the anaerobic tank 300.

The outflow water flowing out through the aerobic tank 400 of the bioreactor is the treated water 600 after the sludge containing the microorganisms that absorbed a large amount of phosphorus through the sludge collector 510 equipped with a stirrer in the final settler 500 Is leaked. Part of the collected sludge is returned to the anaerobic tank 200 by using an external transfer pump 520 and the remaining is drawn out of the system using the excess sludge drawing pump 530 to maintain the concentration of microorganisms in the bioreactor properly. . Description of the outer wall 340 will be described later.

5 is a cross-sectional view taken along line B-B of FIG. 3, and FIG. 6 is an enlarged view of portion C of FIG. 5. 5 and 6, the anaerobic tank 200, the stirrer 210, the outer wall 340, the microbubble diffuser 420, the overflow wall 450, the passage 460, and the water level control baffle 470 are provided. Is shown.

The overflow wall 450, which is a partition wall between the aerobic tank and the anoxic tank, has a height lower than that of the outer wall 340 of the bioreactor, and a passage 460 is formed thereon in which a flow rate can be moved from the aerobic tank to the anaerobic tank at a predetermined interval. The passage 460 is coupled to the water level control baffle 470 that can adjust the height to adjust the internal circulation according to the outflow water level.

As the microbubble generated in the lower portion of the aerobic tank rises to the top by the microbubble diffuser 420, the water level rises, and the fluid is returned back to the anaerobic tank through the passage 450 of the overflow wall and the water baffle 470 installed therein. do. That is, the nitrogen-phosphorus treatment system apparatus using the non-powered internal circulation that can return the fluid from the aerobic tank to the anoxic tank without the internal transfer pump is provided. Description of the anaerobic tank 200 and the stirrer 210 is as described above.

7 is a process flowchart schematically showing a nitrogen-phosphorus treatment method according to a preferred embodiment of the present invention. Referring to FIG. 7, a sewage inflow 100, an anaerobic tank 200, an anaerobic tank 300, an aerobic tank 400, a final settler 500, and treated water 600 are illustrated.

In total, when the sewage inflow 100 containing organic matter in the anaerobic tank 200, the final treatment water in which nitrogen and phosphorus are removed by the sludge precipitated in the final settler 500 after passing through the anaerobic tank 300, the aerobic tank 400 ( 600) is discharged.

Specifically, biologically treating the phosphorus in the sewage by the microorganism in the anaerobic tank 200; Removing nitrogen from the anoxic tank (300); Oxidizing organic matter in the aerobic tank 400 and nitrating organic nitrogen at the same time using the microbubbles generated in the microbubble acid apparatus; Sludge is precipitated in the final settler 500 and separating using a sludge collector.
The process of biologically treating phosphorus in sewage in an anaerobic tank may correspond to a process performed in an anaerobic tank of the prior art phosphorus removal process, that is, a process in which phosphorus in sewage is released in the form of phosphate to the body of microorganisms.

On the other hand, a part of the sewage in the step that the organic matter is oxidized in the aeration tank 400 using the micro-bubble at the same time the organic nitrogen is nitrified is sent back to the anaerobic tank 300 by using the water level and the overflow wall increased by the micro-bubble is denitrated. . Internal conveyance by this non-powered internal circulation accounts for 100-200% of the flow rate.

In addition, a part of the sludge precipitated and collected in the final settler 500 is returned to the anaerobic tank 200 to supplement the microorganisms and the rest is discharged. The external conveyance amount returned to the anaerobic tank 200 accounts for 20-50% of the total.

Although the preferred embodiments of the present invention have been described above, those skilled in the art can variously modify and modify the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. It will be appreciated that it can be changed.

According to the present invention having the configuration as described above, by incorporating the microbubble into the fluid of the aerobic tank by the microbubble diffuser device that is installed on the lower surface of the aerobic tank to generate microbubbles only to promote the oxidation of organic matter by aerobic microorganisms In addition, it is possible to provide a nitrogen-phosphorus treatment apparatus and method using a non-powered internal circulation that maximally removes nitrogen from sewage by circulating a fluid using an elevated water level.

In addition, it is possible to reduce maintenance costs and energy by providing a nitrogen-phosphorus treatment apparatus and method using a non-powered internal circulation that can transfer sewage from an aerobic tank to an oxygen-free tank without installing an internal circulation pump.

In addition, the water level control baffle installed in the passage of the aeration wall of the aerobic tank and the anoxic irradiator has a structure that can adjust the height, so the nitrogen and phosphorus treatment apparatus and method using the non-powered internal circulation that can adjust the internal circulation according to the outflow water level are used. It can be provided.

Claims (4)

An internal circulation system including a bioreactor for removing organic matter in sewage or nutrients including nitrogen or phosphorus, The bioreactor is partitioned into a first portion and a second portion by an inner partition wall, and an anaerobic tank formed in the first portion and a predetermined distance inwardly from both outer side walls of the bioreactor formed on the second portion. An anaerobic tank defined by the spaced apart wall wall, and an anaerobic tank including a baffle formed between the outer wall of the bioreactor and the overflow wall and controls the flow of fluid in the front end portion, The anaerobic tank is combined with an inlet pipe into which sewage or sludge flows and includes an agitator therein, The partition wall partitioning the anaerobic tank and the anaerobic tank includes a plurality of holes, The height of the overflow wall is lower than the outer wall of the bioreactor, the passage is formed at a predetermined interval on the top, The expiratory tank is nitrogen-phosphorus processing apparatus using a non-powered internal circulation is characterized in that the microbubble diffuser device is connected to the blower on the lower surface to generate fine bubbles. The method of claim 1, The nitrogen-phosphorus treatment apparatus using the non-powered internal circulation further comprises a baffle for adjusting the flow rate coupled to the passage and for controlling the flow rate transferred from the aerobic tank to the anoxic tank. The method according to claim 1 or 2, A nitrogen-phosphorus treatment apparatus using non-powered internal circulation, which removes organic substances in the sewage and nutrients such as nitrogen and phosphorus through anaerobic, anaerobic, and aerobic tanks, and has a bioreactor structure. In the nitrogen-phosphorus treatment method which removes nitrogen and phosphorus from the inflow of sewage containing organic matter, the sewage is discharged to treated water through an anaerobic tank, an anoxic tank, an aerobic tank, and precipitates sludge, (a) biologically treating the sewage phosphorus by microorganisms in the anaerobic tank; (b) removing nitrogen from the anaerobic bath; (c) using the microbubbles generated in the microbubble acid apparatus to cause oxidation of organic matter and nitrification of organic nitrogen in the aerobic tank; (d) sedimentation and sedimentation of the sludge in the final settling battery, In the step (c), a part of the sewage is sent back to the anaerobic tank by using the water level and the overflow wall increased by the microbubble, denitrified, and a part of the sludge is returned to the anaerobic tank to replenish microorganisms and the rest is discharged. Nitrogen / phosphorus treatment method using non-powered internal circulation.

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