KR20050007259A - Apparatus for treating organic material and nitrogen of wastewater by using air floatation type biofilter, and treatment method using the same - Google Patents

Apparatus for treating organic material and nitrogen of wastewater by using air floatation type biofilter, and treatment method using the same Download PDF

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Publication number
KR20050007259A
KR20050007259A KR1020040113961A KR20040113961A KR20050007259A KR 20050007259 A KR20050007259 A KR 20050007259A KR 1020040113961 A KR1020040113961 A KR 1020040113961A KR 20040113961 A KR20040113961 A KR 20040113961A KR 20050007259 A KR20050007259 A KR 20050007259A
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South Korea
Prior art keywords
air
floating
filter
filter unit
sludge
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KR1020040113961A
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Korean (ko)
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KR100712643B1 (en
Inventor
유한종
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주식회사 태영
유한종
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • C02F3/06Aerobic processes using submerged filters
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • C02F3/10Packings; Fillings; Grids
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage
    • Y02W10/15Aerobic processes

Abstract

The present invention relates to a biofilm filtration process in a biofilter for organic matter and nitrogen treatment of waste water and wastewater, and more particularly, to a process for filtration of suspended matters contained in waste water by using floating filter media, The present invention relates to a biofilter for decomposing organic pollutants and nitrogen by the action of a gas.
The air floating type biofilter according to the present invention floats the porous floating filter material filled in the reactor at a predetermined ratio by using the air injected into the reactor to infiltrate the air bubbles between the floating filter material pores, This system is designed to float on the surface of water and to perform biodegradation by microbial autolysis by air injection. By mixing the air, water and sludge by rotation of the propeller and injection of high pressure air, And an air floating type biofilter device for collecting sludge by a hopper installed in the lower part of the reactor after backwashing and discharging the sludge to the outside of the reactor through a drain pipe, and a filtration, backwashing and sludge discharging step process using the same will be.

Description

[0001] The present invention relates to an apparatus and method for treating organic matter and nitrogen in sewage, sewage and wastewater using an air floating type biofilter,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biofilm filtration process in a biofilter for treating organic matters and nitrogen in waste water and wastewater and includes a device for effectively floating the filter material provided in the biofilm filtration process by injected air, And a sludge discharge device for collecting and discharging the removed sludge, and an apparatus for treating organic matter and nitrogen in waste water and wastewater using the biofilter.

Due to rapid industrialization and urbanization due to recent economic development, demand for water is rapidly increasing. However, water shortage due to depletion of water resources and water pollution caused by the use of water has caused water shortages. And it is urgent to take measures against the recycling and pollution of water resources. Water treatment technologies for waste water and wastewater include physical treatment with unit processes such as coagulation, sedimentation, separation, adsorption, ion exchange and oxidation, aerobic and anaerobic treatment, biological treatment with microorganisms, And a biological treatment process are combined as a unit process, and are processed in association with each other.

In this water treatment process, a physical filter or a biofilter is used in order to achieve stable overall treatment efficiency by treating the suspended matters and organic pollutants remaining in the treated water chemically or biologically treated first, The filter may be a sand filter having a diameter of about 0.5 to 3 mm and an activated carbon filter for adsorbing contaminants in the micropores of activated carbon particles. These filters have a disadvantage that the backwash cycle and the replacement cycle of the filter medium are short, the backwash water volume is limited, the treatment efficiency for BOD, COD, SS, etc. is low and the facility capacity is large. Due to these disadvantages, biofilters (biological filters) have been applied in recent years.

The conventional biofilter can be classified into two categories in brief. First, a filter medium which can well contain microorganisms in the filter and an organic source that can be consumed by the microorganisms are pre-charged. Then, And bio-degrades the bio-filter. In another classification, the filter is filled with a filter medium capable of living well, and then the microbial concentrate is continuously circulated from the outside of the filter to the inside of the filter by using a device such as spraying, There is this bio-degradable bio-filter. In the case of the present invention, a method is used in which microorganisms applying an electron are coated and the treated carrier is filled in the filter.

In addition, as the filter media, mainly fixed bed filters were used, but in this case, due to repeated microbial adhesion and desorption, the treatment efficiency is lowered, excess sludge is generated, and the area of biodegradable by external air injection is small, In recent years, fluidized-bed media that float on the water surface by air, etc. are mainly used to enhance the treatment efficiency and improve the system stability. According to this trend, the present invention also selects a fluidized-bed filter medium floating inside the reactor.

As shown in FIG. 1A, Korean Patent Application No. 10-1996-0034606 exemplifies an apparatus and a method for treating wastewater by biofilm filtration using floating filter media. In the cited invention, it can be seen that the floating filter media 121 and the pipe and pump device for controlling the waste water treatment process are described in the reactor 101 for discharging the waste water and the waste water upward. In the cited invention, air or pure oxygen is mixed and dissolved with oz and wastewater to provide oxygen to the microorganisms formed on the surface of the floating filter media to decompose the microorganisms in the floating filter media, and then the gas mixture It can be seen that the biofilter 100 is injected from the inlet 111. The injected waste water and wastewater pass through the floating filter media and are filtered, and the filtered treated water is sent to the treatment water tank through the discharge opening 113.

In the case of such a filter used in the filtration step of the water treatment process, it is necessary to appropriately remove the phenomenon of entanglement on the filter surface of the sludge due to adsorption or microbial culture. In the biofilter, if the undifferentiated contaminants continue to accumulate, Thereby causing a problem of lowering the treatment efficiency.

In Korean Patent Application No. 10-1996-0034606, as shown in FIG. 1B, the micro-sludge contained in the coagulated microorganisms on the surface of the bio-filter or in the waste water flowing into the vessel is trapped in the filter by the filtration function of the bio- Is poured at a high speed through the inlet 113 at a high speed to expand the surface layer of the floating filter medium and periodically flush it. In the case of backwashing using water, it is effective to supply a flow rate sufficient to cause a volume expansion of 40% of the volume of the charged carrier, which is disadvantageous in that it requires additional facilities such as a pump and a water tank to supply a large amount of flow.

In the conventional backwashing method, there is a method of backwashing by backwash air injection or a method of performing backwashing process by using water and air injection in parallel. However, in this case, effective backwashing can be performed only by separating the distance between the carriers. And the above-described problem is inherent in use with reverse tax revenues. In addition, in the case of backwashing using the fluid flow as described above, it is possible to effectively remove excessively formed microorganisms between the carriers and the surface of the carrier by expanding the distance between the carriers and providing appropriate shearing force.

The removal of nitrogen, which is a main cause of eutrophication, in the water treatment process for the organic matter and nitrogen treatment of the waste water and wastewater is most important. Conventional treatment methods for nitrogen removal include biological or physical / chemical treatment methods. In the case of dual physics and chemical treatment, there is a problem that the processing efficiency is low and the process is so complicated and the processing cost is increased due to the process of immersing the separation membrane.

The present invention has been made in order to solve all the problems of the conventional physical filter or biological filter described above, and it is an object of the present invention to provide a filter that satisfies the need of a filter having both a physical filtering function and a biological decomposition function, It is an object of the present invention to provide a biofilter system that can be used semi-permanently without replacing filter media by enabling rotation of the propeller and effective backwashing by high-pressure air injection.

Another object of the present invention is to enhance the removal rate of nitrogen which is a cause of eutrophication by biologically decomposing organic matter and denitrifying residual nitrate nitrogen by coating a microorganism including denitrifying microorganisms on floating filter media.

FIG. 1A is a schematic view of a conventional biofilter using a floating filter medium, FIG. 1B is a schematic view showing a conventional biofilter backwasher

FIG. 2A is a schematic view showing a state before air introduction of the air floating type biofilter of the present invention, FIG. 2B is a schematic view showing a state after air inflow of the air floating type biofilter of the present invention

FIG. 3 is a graph showing the state before the backwashing in the air floating type biofilter apparatus of the present invention

4 is a state diagram after backwashing in the air floating type biofilter apparatus of the present invention

DESCRIPTION OF THE REFERENCE SYMBOLS

1: Biofilter 10: Reactor

11: inlet pipe 13: outlet pipe

20: filter unit 21: floating filter medium

23: upper perforated plate 25: lower perforated plate 33: hopper 35:

41: air pump 45: diffuser 52: propeller 54: motor

In order to accomplish the object of the present invention, the air floating type biofilter according to the present invention comprises a biofilter for filling a floating filter medium in a reactor of a predetermined size and introducing and treating ozone / In an apparatus for treating organic matter and nitrogen in wastewater,

A filter unit having a predetermined size formed by upper and lower perforated plates spaced apart from each other by a predetermined distance in the reactor; A porous floating filter material filled in the filter unit at a predetermined volume ratio; An air supply unit provided at a lower portion of the filter unit to supply air to the floating filter medium; A backwash device installed in the filter unit to back up sludge adhering to the floating filter medium surface of the filter unit; And a sludge discharging unit provided at a lower portion of the filter unit to collect sludge desorbed from the filter unit.

And the floating filter material is a block cut to a size of about 15 mm x 15 mm x 15 mm.

And the floating filter medium is filled at a ratio of 40% to 60% of the internal volume of the filter unit.

The floating filter medium is characterized by having a porosity of 98% or more so that self-buoyancy can be increased by the air supplied from the air supply means.

The floatation filter material is characterized in that the denitrifying microorganism is coated so that the denitrification treatment efficiency at the time of biological decomposition is excellent.

And the air supply means includes an air diffusing pipe of a predetermined size for supplying fine air bubbles to the filter unit.

The backwashing apparatus may include one or more propellers installed in the filter unit.

Further, in the method for treating organic matters and nitrogen in the waste water by using the air floating type biofilter according to the present invention, in the air floating type biofilter having the above-described configuration, A filtration layer forming step of forming a filtration layer having a predetermined thickness by bringing the floating filter medium into close contact with the upper porous plate; A filtration step of physically filtering and biologically decomposing upflow wastewater flowing into the lower part of the filter layer; A backwash step of rotating the propeller installed in the filter layer to agitate the filtration layer to desorb the sludge adhered to the filtration layer; And a sludge discharging step of discharging the sludge which is desorbed in the backwashing step and precipitated by gravity to the outside.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, and a detailed description of known elements that may obscure the gist of the present invention will be omitted.

FIG. 2A is a schematic view showing an air floating type biofilter according to the present invention, FIG. 2B is a schematic view for performing a filtering step of an air floating type biofilter according to the present invention, and FIG. FIG. 4 is a schematic block diagram of a pneumatic lifting type biofilter according to the present invention for performing sedimentation and sludge discharging steps according to an embodiment of the present invention; FIG.

As shown in the figure, the air floating type biofilter 1 according to the present invention includes a reactor 10 of a predetermined size, upper and lower perforated plates 23 and 25 installed to be spaced apart from each other by a predetermined distance in the reactor 10, A porous floating filter material 21 filled in the filter unit 20 at a predetermined volume ratio and a filter unit 20 for supplying air to the floating filter material 21, A backwashing device 50 provided in the filter part 20 to remove sludge sticking to the floating filter material surface of the filter part 20, And a sludge discharging means (30) provided at a lower portion of the filter unit (20) for collecting the sludge desorbed from the floating filter medium of the filter unit (20).

First, the reactor 10 is made of a material such as stainless steel, carbon steel, or resin, and its shape is not limited to a specific shape such as a circular square. An inlet pipe 11 through which waste water and wastewater flows is formed at the lower end of the reactor 10 and a discharge pipe 13 through which the filtered treated water is discharged is formed at an upper end. Therefore, the waste water is introduced through the inflow pipe 11, processed through the upward flow, and then discharged to the discharge pipe 13.

A filter unit 20 having a predetermined volume is formed in the center of the reactor 10 by an upper porous plate 23 and a lower porous plate 25. At this time, the upper and lower perforated plates (23) and (25) are formed with a plurality of holes having a size that does not allow the floating filter material to be filled in the filter part (20).

In the filter unit 20, a floating filter material having a predetermined size is charged at a ratio of 40% to 60% of the internal volume of the filter unit 20. The floating filter material (21) should have a specific gravity of 1.0 to less than 1.5 and a porosity of 98% or more so as to increase its buoyancy through air inflow, so that it is easy to penetrate air and have high chemical resistance and corrosion resistance. For example, the floating filter material 21 is made of a polyester fiber sponge having a specific surface area of 1930 m 2 / m 3 or more, a specific gravity of 1.3, and a porosity of 98%. At this time, it is preferable that the size of the floating filter medium 21 is 15 mm x 15 mm x 15 mm (width x length x height).

The air supply means 40 includes an air diffuser 45 installed below the filter unit 20 and an air pump 41 and an air supply pipe 42 for introducing air into the air diffuser 45 Consists of. The backwashing means 50 includes at least one propeller 52 installed in the filter unit 20 and a motor 54 for rotating the propeller 52. The sludge discharging means 30 includes a hopper 33 installed at a lower portion of the filter unit 20 and a drawing pipe 35 for drawing excess sludge deposited in the hopper 33 to the outside.

Hereinafter, a method of treating wastewater using an air floating type biofilter according to the present invention will be described. First, the floating filter material 21 is charged into the filter unit 20 through a manhole (not shown) at a ratio of 40% to 60% of the internal volume of the filter unit 20. The water in the reactor 10 is then filled up to the full water level. The air generated by the air pump 41 provided outside the side of the reactor 10 is supplied to the air diffuser 45 provided below the filter unit 20 through the air supply pipe 42. The minute bubbles generated in the air diffuser 45 are supplied into the filter unit 20 so that the floating filter medium 21 floats toward the upper porous plate 23 of the filter unit 20. That is, the micro air bubbles generated in the air diffuser 45 are introduced into the air gap of the floating filter medium 21, and the specific gravity of the floating filter medium 21 falls from 1.3 to 0.85, and the floating air bubble floats. When the fine air bubbles are sufficiently supplied, most of the floating filter medium 21 is densely packed closely to the upper side of the filter unit 20 to form a filtration layer having a predetermined thickness. This results in a filtration layer forming step.

Meanwhile, in the present invention, the floating filter material 21 is partially filled at a ratio of 40% to 60% of the volume of the filter unit 20, thereby facilitating floating and backwashing by air supply and maintaining a certain level of processing efficiency do. For example, when the floating filter medium 21 is charged to 40% or less of the volume of the filter unit, the floatation and backwashing process by the air supply is easy, while the filtration layer is thinned and the treatment efficiency is low. On the contrary, when the floating filter medium 20 is charged to about 60%, the treatment efficiency becomes high, but it becomes difficult to rise and back up by the air.

When the floating filter medium 21 floats above the filter unit 20 and a dense filtration layer is formed, the wastewater is passed through the filter unit 20 through the waste water inlet pipe 11 to perform a filtration process. At this time, the upper perforated plate 23 provided on the filter unit 20 prevents the floating filter material 21 from flowing out, filters out suspended substances such as sludge, and passes through the holes 21 smaller than the floating filter material 21 It is preferable to be punched.

On the other hand, the floating filter medium 21 has a rectangular shape cut into small pieces of a predetermined size. For example, the floating filter medium 21 is a small block of 15 mm x 15 mm x 15 mm (width x height x height). By thus cutting the floating filter medium 21 into a small size, the clearance between the floating filter media 21 can be minimized to improve the physical filtering function. In addition, the larger the size of the floating filter medium 21, the smaller the problem of clogging due to the larger pore size of the carrier layer, but the smaller the specific surface area of the carrier, and the smaller the treatment efficiency, the proper size should be maintained.

And predetermined microorganisms of the floating filter medium 21 are coated in advance. The microorganism should be selected as a nutrient for the influent wastewater as a nutrient and adapted to the treatment wastewater and having an excellent activation performance. For example, it is possible to coat the floating filter medium 21 with a microorganism including denitrifying microorganisms, and thus it is possible to perform biodegradation in addition to BOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand) and SS (Suspended Solid) Wastewater treatment It is possible to achieve stable denitrification efficiency by installing it at the end of the advanced treatment process of the end treatment plant.

In addition, the floated floating filter material (21), when there is no additional air inflow, flows through the floating filter material (21) as time elapses, and its own buoyancy decreases and sinks in the water. Therefore, an important factor in selecting such an air floating filter medium 21 is that the micro bubble penetrating the floating filter medium 21 should be a material that can be left for a long time.

Accordingly, the organic material filtered in the filtration process undergoes a biological reaction that is decomposed by the microorganisms attached to the surface of the floating filter material 21. At this time, the microorganisms attached to the floating filter medium (21) are subjected to biological decomposition by receiving oxygen from the air injected through the air diffuser (45). That is, microorganisms coated on the surface of the floating filter material 21 receive oxygen from the air injected into the filter unit 20 to biologically decompose the organic matter of the sludge.

As described above, according to the present invention, the filtration layer forming step is formed by floating the filter media by the air supply, the filtration step of filtering the sludge of the waste water flowing through the floating filter medium layer, Is decomposed by the microorganisms on the surface of the floating filter media.

When this filtration and decomposition step is repeated, the microorganism sludge propagated on the surface of the floating filter material 21 is accumulated. In addition, since the growth rate of the fine sludge or microorganisms contained in the inflow water and sandwiched between the floating filter media 21 by the filtration function of the floating filter medium 21 is much larger than the extinction rate, the surplus microorganism Thereby blocking the air gap of the floating filter medium 21. That is, as the organic pollutants (BOD) introduced are decomposed by the microorganisms, the decomposition components are converted into the biomass of the microorganisms and the surplus microorganism sludge accumulates therein. The biomass in the carrier bed, such as backwash, should be controlled at appropriate intervals to shorten the lifetime.

3 is a block diagram showing a backwashing step in the present invention. As shown in the figure, the propeller 52 installed in the filter unit 20 is rotated by the rotational force of the motor 54 installed on the reactor 10 to backwash. At this time, the propeller (52) proceeds for about 30 minutes while repeating forward rotation and reverse rotation between 180 and 210 RPM. And the motor 54 is driven by a separate control device (not shown). In order to improve backwash efficiency, it is preferable that the propeller (52) is rotated and high-pressure compressed air is injected into the filter unit (20) through the air diffuser (45). When high backwashing air is injected while backwashing is carried out through the propeller 52 rotating inside the filter unit 20 by the rotational force of the motor 54, the backwashing air of the high pressure becomes the distance between the floating filter materials 21 . At this time, the floatation filter media (21) collide with each other while water and air are stirred together, and the sludge attached to the floating filter material (21) is removed. The separated sludge then passes through the lower perforated plate 25 of the filter unit 20 and precipitates into the hopper 33 installed in the lower part of the reactor 10.

FIG. 4 shows a sludge discharging step for discharging the sludge settled in the hopper 33 to the outside after finishing the filtration step and the backwashing step. A funnel-shaped hopper 33 is installed at the bottom of the reactor 10 to collect sludge to be precipitated. The accumulated sludge is discharged to the outside through a drawing pipe 35 formed on one side of the lower end of the reactor 10.

On the other hand, an electrically operated valve (not shown) and a timer (not shown) are connected to the air supply pipe 42, the waste water inflow pipe 11, the process water discharge pipe 13 and the sludge discharge pipe 35 of the present invention, The filtration process, the backwash process, and the sludge discharge process described above are automatically repeated according to the timer set by a predetermined period.

<Examples>

Hereinafter, preferred embodiments of the present invention will be described. However, it should be understood that the present invention is not limited to the following embodiments.

&Lt; Example 1 >

The results of the purification experiment using the air floating type biofilter of the present invention as influent water discharged from the sewage end treatment plant are shown in the table. The passage flow rate was 15 minutes, the filtration material filling rate was 0.2 m 3 (40%), and the one-treatment flow rate was 48 m 3 / day.

<Table 1>

Item 1 parking 2 parking Average concentration Throughput Influent Drainage Influent Drainage Influent Drainage BOD 13.1 7.2 14.3 7.0 13.7 7.1 48.2% COD 11.2 3.6 10.7 4.8 10.95 4.2 61.6% SS 11.7 4.5 9.2 3.4 10.45 3.95 62.2% T-N 12.9 9.1 11.8 8.3 12.35 8.7 29.6%

As shown in the above experiment results, the SS filtering efficiency is 64%, and the BOD treatment efficiency is also 50.4%, which shows that the biodegradation is active even in the case of 15 min. During this period, the treatment efficiency did not decline suddenly and did not back up.

&Lt; Example 2 >

The experimental results are shown in Table 1, where effluent water discharged from the sanitary sewage treatment plant, which generates an average of 80 m 3 / day of sewage water using the biofilter of the present invention, is shown. The treatment efficiency for each condition was experimented while changing the passing flow rate after the biofilter of the present invention and the filling rate of the filter element.

<Table 2-1> Daily capacity of 80㎥ / day, flow rate of 9 minutes, filtration rate of 0.3㎥ (60%)

Item 1 parking 2 parking Average concentration Treatment efficiency Influent Treated water Influent Treated water Influent Treated water BOD 25.9 11.5 26.7 11.8 26.3 11.7 55.5% SS 18.0 5.8 19.6 5.6 18.8 5.7 69.7%

<Table 2-2> Daily processing capacity of 80㎥ / day, flow rate of 9 minutes, filtration material filling rate of 0.15㎥ (30%)

Item 1 parking 2 parking Average concentration Treatment efficiency Influent Treated water Influent Treated water Influent Treated water BOD 26.1 12.8 24.8 13.1 25.5 13.0 49% SS 19.2 9.9 20.3 11.7 19.8 10.85.7 45.5%

<Table 2-3> Daily treatment capacity 50㎥ / day, flow rate 14.4 minutes, filtration rate 0.15㎥ (30%)

Item 1 parking 2 parking Average concentration Treatment efficiency Influent Treated water Influent Treated water Influent Treated water BOD 27.3 14.2 25.7 12.6 26.5 13.4 49.5% SS 20.8 9.9 22.6 13.8 1821.7.8 11.9 45.2%

<Table 2-4> Daily capacity of 50㎥ / day, flow rate of 14.4 minutes, filtration rate of 0.3㎥ (60%)

Item 1 parking 2 parking Average concentration Treatment efficiency Influent Treated water Influent Treated water Influent Treated water BOD 28.2 12.2 24.8 10.3 26.5 11.3 57.4% SS 17.6 5.3 19.7 6.0 18.7 5.7 69.5%

According to Tables 2-1, 2, 3 and 4, the treatment efficiency was more affected by the charged amount of air floating filter medium than the passing flow rate, and when the charged amount of air floating filter medium was 30% Overall decline. In addition, it is possible to increase the treatment efficiency by increasing the charged amount of the air floating filter medium. However, when the charged amount is excessive, collision between the filter media is not smooth at the time of backwashing of the filter. Therefore, the filling rate of the air floating filter medium is suitably between 40% and 60%, and the flow rate of water is experimentally found to be the most efficient in the range of about 14 to 15 minutes.

As described above, the present invention has a physical filtering function applied to the conventional waste water treatment, and enables the simultaneous biological decomposition of the contaminants contained in the waste water by the metabolic activity of the microorganisms coated on the filter media And the floating filter medium is floated through the fine air bubbles so that the filtration layer is densely constructed to improve the filtration efficiency and the floating filter medium is provided in a volume of 40% To 60%, and it is effectively backwashed by the propeller rotation and the high-pressure air as a back-up device, thereby making it possible to repeatedly use the filtration layer without clogging or replacement.

In addition, since the present invention can simultaneously perform physical filtration and biological decomposition in a single device, the treatment efficiency is high, so that the treated water can be used as a heavy water treatment in the present apparatus, and a large capacity water treatment can be performed with a small- And the reduction of the facility cost is significant. In particular, it is possible to coat the microorganisms including the denitrifying microorganisms in the floating filter media to denitrify the residual nitrate nitrogen, thereby eliminating the need for an additional facility for nitrogen removal, thereby reducing the process and the cost thereof.

In addition, the present invention can effectively back up the propellant using the propeller rotation and the high-pressure air while keeping the internal filling rate of the filter medium at 40% or less, so that the treatment efficiency is stable even when the filter is used for a long period of time and the excellent water- And the maintenance cost is reduced due to insufficient replacement and replacement of the filter medium.

Claims (13)

1. An apparatus for treating organic matter and nitrogen in waste water using a biofilter for filling a floating filter medium in a reactor of a predetermined size and introducing the waste water from below into an upward flow,
A filter unit having a predetermined size formed by upper and lower perforated plates spaced apart from each other by a predetermined distance in the reactor;
A porous floating filter material filled in the filter unit at a predetermined volume ratio;
An air supply unit provided at a lower portion of the filter unit to supply air to the floating filter medium;
A backwash device installed in the filter unit to back up sludge adhering to the floating filter medium surface of the filter unit;
And a sludge discharging unit disposed at a lower portion of the filter unit to collect sludge desorbed from the filter unit. The apparatus for treating organic matter and nitrogen in waste water and wastewater using the air floating type biofilter.
The method according to claim 1,
Wherein the floating filter medium is a small block cut into a size of 15 mm x 15 mm x 15 mm. The apparatus for treating organic matter and nitrogen in waste water and wastewater using the air floating type biofilter.
3. The method according to claim 1 or 2,
Wherein the floating filter medium is filled at a ratio of 40% to 60% of the internal volume of the filter unit.
3. The method according to claim 1 or 2,
Wherein the floating filter medium has a porosity of 98% or more so that self-buoyancy can be increased by the air supplied from the air supply means.
3. The method according to claim 1 or 2,
Wherein the floating filter material is coated with a microorganism including a denitrifying microorganism to biologically decompose the organic material and denitrify the residual nitrate nitrogen.
The method according to claim 1,
Wherein the air supply means comprises an air diffuser of a predetermined size for supplying fine air bubbles to the filter portion, an air supply pipe for injecting air into the air diffuser, and an air pump. Organic matter and nitrogen treatment system of waste water.
The method according to claim 1,
Wherein the backwashing apparatus comprises at least one propeller installed in the filter unit, and a motor for driving the propeller, wherein the backwashing apparatus comprises at least one propeller installed in the filter unit, and a motor for driving the propeller.
A filter unit of a predetermined size formed by upper and lower perforated plates installed at a predetermined distance inside a reactor of a predetermined size; A porous floating filter material filled in the filter unit at a predetermined volume ratio; An air supply unit provided at a lower portion of the filter unit to supply air to the floating filter medium; A backwash device installed in the filter unit to back up sludge adhering to the floating filter medium surface of the filter unit; And a sludge discharging unit disposed at a lower portion of the filter unit to collect sludge desorbed from the filter unit, wherein the surface of the floating filter material is coated with a microorganism, And a nitrogen treating method,
A filtration layer forming step of forming a filtration layer having a predetermined thickness by bringing the floating filter medium into contact with the upper porous plate using air bubbles supplied from the air supply unit;
A filtration step of physically filtering and biologically decomposing upwardly flowing waste water flowing into a lower portion of the filter layer such that the filtration layer passes through the filtration layer at a predetermined speed;
A backwash step of rotating the propeller installed in the filter layer to agitate the filtration layer to desorb the sludge attached to the filtration layer;
And a sludge discharging step of discharging the sludge which is desorbed in the backwashing step and precipitated by gravity to the outside.
9. The method of claim 8,
The floating filter medium is prepared by cutting the microorganism carrier into 15 mm × 15 mm × 15 mm (width × length × height) and coating the microorganisms on the cut carrier uniformly at a ratio of 40% to 60% A method for treating organic matter and nitrogen of waste water and wastewater using air floating type biofilter.
9. The method of claim 8,
The microbial carrier is a polyester fiber sponge having a porosity of 98% or more.
A method of treating organic matter and nitrogen of wastewater using air floating type biofilter.
9. The method of claim 8,
Wherein the microorganisms coated on the floatation filter material are denitrification microorganisms having high denitrification efficiency.
9. The method of claim 8,
Wherein the high-pressure backwashing air is injected into the filter portion through the air supply means in the backwashing step.
9. The method of claim 8,
Wherein the flow rate of water in the filtration step is about 14 to 15 minutes. &Lt; RTI ID = 0.0 &gt; 18. &lt; / RTI &gt;
KR20040113961A 2004-12-28 2004-12-28 Apparatus for treating organic material and nitrogen of wastewater by using air floatation type biofilter, and treatment method using the same KR100712643B1 (en)

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