KR100444700B1 - Apparatus for Treatment of Wastewater having Bioreactor with Nonwoven Fabric Filter and a Method for Treatment thereby - Google Patents

Abstract

The present invention relates to a wastewater treatment apparatus and a treatment method equipped with a biological reaction tank attached with a nonwoven fabric filter membrane, and specifically, to remove organic matter and nitrogen in the wastewater according to a biological method, a wastewater inlet for injecting wastewater into the upper center. A wastewater treatment apparatus having a biological reaction tank having an air inlet for injecting air and an outlet pipe for transporting the treated water at a lower center thereof, comprising: a nonwoven filtration membrane provided in the bioreactor for wastewater sludge and treatment As the solid-liquid separation of water is possible, a separate settling tank is unnecessary and the concentration of microorganisms in the bioreactor can be kept high, thereby reducing the size of the treatment facility. In addition, the present invention is seeded by initially injecting the microbial mixed solution into the nonwoven fabric filter membrane using the wastewater treatment apparatus and the wastewater injected from the wastewater inlet and the wastewater to remove organic matter and nitrogen contained in the wastewater by the microorganism under aerobic or anaerobic conditions The present invention relates to a treatment method, which not only effectively removes organic matter and nitrogen contained in wastewater, but also increases the removal efficiency by adjusting the aeration / non-aeration operation and maintains a high concentration of microorganisms in the reactor. The microbial ratio is very effective because it reduces the amount of sludge discarded by the concept of complete oxidation.

Description

Apparatus for Treatment of Wastewater having Bioreactor with Nonwoven Fabric Filter and a Method for Treatment

The present invention relates to a wastewater treatment apparatus and a treatment method equipped with a biological reaction tank attached with a nonwoven fabric filter membrane, and specifically, to remove organic matter and nitrogen in the wastewater according to a biological method, a wastewater inlet for injecting wastewater into the upper center. A wastewater treatment apparatus having a biological reaction tank provided with an air inlet for injecting air and an outlet pipe for transporting the treated water in the lower center of the wastewater treatment apparatus, the apparatus includes: Injecting the microbial mixed solution into the filter membrane to remove the wastewater injected from the wastewater inlet and the organic matter and nitrogen contained in the wastewater by microorganisms under aerobic or anaerobic conditions, and the wastewater separating the obtained treated water through the outflow pipe A processing apparatus and method.

Biological treatment of wastewater is classified into aerobic and anaerobic processes according to the oxygen supply, and is classified into suspended growth method and adhesion growth method according to the growth type of microorganisms.

Activated sludge (AS), the most widely used method for biological treatment of wastewater, is an aerobic suspended growth method (WEF and ASCE, Design of Municipal Wastewater Treatment Plants , Vol. II, 4th Ed. (1998); Metcalf and Eddy, Wastewater Engineering , 3rd Ed., McGrall-Hill (1991))), treating the wastewater by biological methods using activated sludge, an aerobic microbial group that grows by injecting air into the wastewater and has a good sinking property. That's how. The activated sludge method uses aeration tank, sedimentation tank, and conveying equipment as basic components, and when wastewater flows into the aeration tank, organic matter is ingested and decomposed by aerobic microorganisms to generate new microorganisms, and microorganisms and treated water are separated from the sedimentation tank to separate the supernatant. The effluent is discharged and some of the precipitated activated sludge is returned to the aeration tank as return sludge and the excess sludge is discarded.

However, the activated sludge process requires a sedimentation tank as a separate process for separating the microorganism and the treated water requires a high installation cost and a separate site.

As a result of the research, a membrane-bound activated sludge process has been proposed in which a membrane is installed to separate microorganisms and treated water in a bioreactor in which microorganisms grow. The process combines the decomposition of biological organics and a physical membrane process, and wastewater is treated using a membrane bioreactor (MBR).

The membrane-bound activated sludge process can be divided into a crossflow membrane process (Secrossflow Membrane Bioreactor Process) and a submerged membrane bioreactor process included in the bioreactor.

The circulation process has a large flow path of the feed liquid and a large flow rate of the feed liquid, so that the formation of scale is small, so that the planned processing quantity can be secured for a long time, and if the pressure difference between the membranes increases, backwashing is performed to extend the life of the membrane. It is installed outside the bioreactor and it is easy and economical to replace the membrane. However, since the mixed liquid is transferred to an external membrane module by a circulation pump, a separate membrane module site is required in addition to the bioreactor.

Submerged processes immerse membrane modules in a bioreactor and separate them using a single pump, thus simplifying the system itself and consuming less site. However, as the operation period elapses, the flow path of the membrane is easily clogged, and a lot of maintenance costs such as cleaning and replacement of the membrane are consumed, and pretreatment by a debris removal process is required to prevent this. In particular, since the inside of the bioreactor is not easy to wash the membrane, there is a problem to lift to the outside when washing the membrane.

In addition to biological treatment, the circulating and submerged membrane-bound bioreactors can separate solid-liquid by membranes, which eliminates the need for activated sludge settling tanks and provides high-quality treatment water. In addition, there is an advantage in that the concentration of microorganisms in the reaction tank can be maintained to reduce the weight of the device, and microorganisms, such as nitrifying microorganisms, which are slow in growth rate can be maintained at high concentrations and are easily applied to advanced processing.

Currently, UF (ultra filtration) or MF (microfiltration) is used as a separator used in the circulation type and immersion type processes, which causes accumulation of low molecular weight organic substances or salts, which are the final metabolite of microorganisms in case of reverse osmosis (RO). This is because it inhibits biological treatment. However, since the membrane used is very expensive and the resistance through the membrane is high, the power unit is not only required to obtain a practical permeate amount but also has to be periodically backwashed.

Nonwoven fabrics, on the other hand, are a combination of fibers not by spinning or weaving, but by the physical and chemical means of the fiber assembly or by appropriate moisture or heat. The internal structure of the nonwoven fabric is different depending on the manufacturing method, but in general, since the fibers are porous structures arranged randomly in three dimensions, the suspended matter penetrating into the inside is easily filtered by the fibrous structure or easily adhered to the surface. Since the nonwoven fabric has the above-described internal structure, it is also used as a filtration membrane, and is currently being applied to an air filter or the like of an automobile.

Therefore, the present inventors take advantage of the activated sludge method and the membrane-bound bioreactor, install the non-woven filtration membrane inside the bioreactor and place the diffuser inside the non-woven fabric for aeration, taking into account that the filtration efficiency of the nonwoven fabric is excellent and economical. The nonwoven filtration membrane bioreactor was developed, and as a result of treating wastewater using the designed bioreactor, it was found that the organic and nitrogen removal efficiencies were excellent.

It is an object of the present invention to provide a wastewater treatment apparatus and a treatment method equipped with a biological reactor equipped with a nonwoven filtration membrane.

1 is a schematic diagram illustrating a wastewater treatment apparatus equipped with a bioreactor according to the present invention.

2 is an enlarged view of a bioreactor equipped with a nonwoven filtration membrane of the present invention:

a: without a stirring device; b: when equipped with a stirring device.

Figure 3a and 3b is an embodiment of the wastewater treatment apparatus of the present invention.

4 is a graph showing the BOD concentration of the influent and the BOD removal efficiency after passing through the treatment apparatus of the present invention:

-O-: BOD concentration of influent; -BOD concentration of effluent;

-■-: BOD removal efficiency.

Figure 5 is a graph showing the SS removal efficiency and SS removal efficiency after passing through the treatment apparatus of the present invention:

-O-: SS concentration of influent; SS concentration of effluent;

-■-: SS removal efficiency.

6 is a graph showing the nitrogen concentration introduced and the nitrogen removal efficiency after passing through the treatment apparatus of the present invention:

-O-: T-N concentration of influent; T-N concentration of effluent;

-■-: Nitrogen removal efficiency.

7 is a graph showing the total nitrogen removal efficiency according to the aeration / non-aeration time ratio when the intermittent aeration operation method is applied:

-■-: T-N concentration of influent; T-N concentration of effluent;

-○-: nitrogen removal efficiency.

8 is a graph showing the total nitrogen removal efficiency according to the aeration / non-aeration time ratio when the intermittent aeration operation method is applied:

-■-: C / N ratio; -▲-T-N removal efficiency;

-○-: BOD removal efficiency.

* Detailed description of the main symbols in the drawings *

1: wastewater treatment device 100: bioreactor

101: nonwoven filtration membrane 102: diffuser

103: inlet tube 104: shielding device

105: overflow pipe 106: outflow pipe

200: microbial mixed solution 300: pump

301: blower 302: influent storage tank

303: Effluent storage tank 400: Stirring device

401: motor

In order to achieve the above object, the present invention is:

A biological reactor equipped with a wastewater inlet for injecting wastewater in the upper center, an air inlet for injecting air, and an outlet pipe for transporting the treated water in the lower center to remove organic matter and nitrogen in the wastewater according to a biological method. In the wastewater treatment apparatus provided with:

Install a nonwoven fabric filter (nonwoven fabric filter) inside the bioreactor, the filter membrane is made in the form of the lower end is blocked in the same structure as the long axis direction of the reaction vessel, and positioned so as to maintain a constant distance to the inner wall of the reactor,

Provided is a wastewater treatment apparatus including a bioreactor having an air diffuser for aeration of a reaction vessel at an inner lower end of a nonwoven fabric membrane.

In addition, the present invention is:

In order to remove organic matter and nitrogen in the waste water according to a biological method, the plant is initially planted by injecting a microbial mixture into the bioreactor; Incubating the microorganisms by introducing air while appropriately adjusting the external temperature; Introducing waste water at a constant rate into the bioreactor; In the wastewater treatment method of removing organic matter and nitrogen contained in wastewater by microorganisms under aerobic or anaerobic conditions,

The wastewater is introduced into a non-woven fabric filter and a bioreactor having an acid pipe under the filter membrane for aeration to provide a wastewater treatment method for removing organic matter and nitrogen contained in the wastewater by microorganisms.

Hereinafter, the present invention will be described in more detail.

Specifically, the apparatus of the present invention, as shown in Figure 1 , after passing the waste water through a bioreactor (100, bioreactor) equipped with a nonwoven fabric filter (101, non-woven fabric filter), it is possible to recover the treated water Include a structure that is

More specifically, the bioreactor 100 is provided with a nonwoven fabric filtration membrane 101 therein, and located at a predetermined interval with the inner wall of the bioreactor 100, having the same structure as the long axis direction, at the lower end of the nonwoven fabric filtration membrane 101 The diffuser 102 is installed in a flat structure in a horizontal direction so that the air diffuser is positioned (see FIG. 2 ).

The nonwoven fabric used in the present invention is not particularly limited, but should have pores that can smoothly escape material, thickness, and treated water to satisfy a certain level of chemical resistance and durability to withstand wastewater. As a material, a polymer generally used for manufacturing a nonwoven fabric may be used. For example, a single or a mixture of two or more selected from the group consisting of polyester, polypropylene, viscose rayon, nylon, cotton, wool, and glass fiber may be used. do.

As the nonwoven fabric is used as a filtration membrane, a membrane-bound bioreactor can be obtained without the need for separate solid-liquid separation, and at the same time, the organic / nitrogen removal efficiency can be obtained at an equivalent or higher effect as compared with the conventional expensive filtration membrane. It is effective because it consumes less material and operating costs.

In particular, the nonwoven fabric is operated at a relatively small head difference due to the large porosity and low membrane resistance, compared to the general membrane, so it is not necessary to backwash due to the pumping facility for clogging or the phenomenon of pressurization or suction. Preferably the pore size is 20 to 300 µm, more preferably 50 to 150 µm, thickness is 5 to 30 mm, preferably 6 to 15 mm.

According to one preferred embodiment, the nonwoven fabric filtration membrane 101 of the present invention has an effective volume of 15 L of the bioreactor 100, and when the wastewater is treated about 30 L / day, using a PET / PP material 6 mm thick , Having a pore size of 100 μm was used. The material and thickness of the nonwoven fabric used may be appropriately modified depending on the capacity of the wastewater being treated.

The diffuser 102 is installed for aeration of the wastewater, but is appropriately provided to have various sizes at predetermined intervals in order to uniformly supply the air flowing from the air injecting device, which is dependent on the size of the bioreactor 100 Can be controlled by one of ordinary skill in the art.

According to a preferred embodiment of the present invention, the bioreactor 100 is as shown in Figure 2a

In order to smooth the flow of the treated water is made of a conical structure from the bottom to a predetermined position,

Injecting wastewater into the bioreactor 100, but injecting while adjusting the speed through the influent pipe 103, using an inlet pipe (103, pump) from the inlet water storage tank (302, sewage storage tank),

A cover plate 104 is optionally attached to allow the formation of anaerobic or anaerobic conditions,

In order to increase the water level due to the clogging phenomenon of the nonwoven fabric filtration membrane 101, the overflow pipe 105 is provided at a predetermined position from the bottom,

Position the diffuser 102 inside the nonwoven filtration membrane 101 to inject air, so as to be connected to an external blower 301 to control the flow rate and speed,

In order to recover the treated water through the nonwoven fabric membrane 101, the treated water is passed through an effluent pipe 106 connected to the conical portion of the bottom of the bioreactor 100, and an effluent storage tank 303. It includes a structure that is transferred to).

However, such a bioreactor 100 is only one embodiment of the present invention to achieve a variety of external forms by those skilled in the art.

The bioreactor 100 may further include a mixer 400 to efficiently react the wastewater with the microorganisms.

According to another preferred embodiment of the present invention, the bioreactor 100 to which the stirring device 400 is added is shown in FIG . 2B ,

By placing and stirring the agitator 400 having a paddle inside the bioreactor 100, the interaction between the wastewater and the microorganisms in the microbial mixture is increased. In addition, the stirring device may be connected to an external motor (401, motor) to adjust the stirring speed.

As such, the wastewater treatment apparatus 1 of the present invention is different from the apparatus used in the conventional activated sludge method, which is provided with aeration tank, bioreactor, sedimentation tank, and conveying equipment, and a bioreactor 100 having a nonwoven fabric filtration membrane 101 is provided. By using the above, the settling tank can be omitted. In addition, by using a nonwoven fabric membrane, the concentration of microorganisms in the filter membrane can be maintained at a certain level, so that a return facility, which is essential for the conventional activated sludge method, is unnecessary, and the treatment apparatus can be simplified, thereby reducing the production cost.

In addition, the wastewater treatment method using the wastewater treatment apparatus using the apparatus including the bioreactor 100 of the present invention in detail,

After initially injecting a microbial mixed solution into the bioreactor 100 having the nonwoven fabric filtration membrane 101 and planting the same, culturing the microorganisms by appropriately adjusting the external temperature and introducing air therefrom,

After the wastewater is introduced into the bioreactor 100 at a constant speed,

Removes organic matter and nitrogen contained in waste water by microorganisms under aerobic or anaerobic conditions,

Through the nonwoven fabric filtration membrane 101, the treated water is discharged through the outlet pipe 106.

The treated water is stored in the outflow storage tank 303 via the outflow pipe 106.

At this time, any microorganism used can be used as long as it is usually used for wastewater treatment, the conditions also follow the usual.

As shown in Figures 3a and 3b it is possible to install a plurality of bioreactors 100 in series or in parallel, it is possible to maximize the denitrification effect in the waste water by operating in combination with an oxygen-free tank or operating in an intermittent aeration.

According to a preferred embodiment, as a result of treating wastewater using a single bioreactor 100 in an aerobic atmosphere, BOD removal efficiency, which is a measure of organic matter removal efficiency, was 97% on average, and was excellent in removing organic matter. The denitrification effect was superior to that of the conventional activated sludge method at 39% or more, and the SS concentration was kept low, so that a separate solid-liquid separation facility was not required (see FIGS . 4 to 6 ).

According to another embodiment, the result of treating the wastewater by applying aeration / non-aeration continuously by applying the intermittent aeration operation, the organic removal efficiency is more than 94% and the total nitrogen removal efficiency is up to 83% to confirm the excellent treatment effect (See FIGS . 7 and 8 ).

As such, the wastewater treatment by the microorganism according to the present invention was able to obtain an excellent organic / nitrogen removal effect by using an economical non-woven filter membrane in the bioreactor. In addition, the use of the filtration membrane does not require separate solid-liquid separation used in the conventional sedimentation tank, thereby reducing the amount of waste sludge and eliminating the need for separate site selection due to the weight of the treatment apparatus and the installation of the sedimentation tank. It can lead to cost reduction. In particular, it is possible to maintain a high concentration of microorganisms in the bioreactor, thereby reducing the size of the treatment facility.

Hereinafter, the present invention will be described in more detail with reference to Examples. The following Examples are only examples of the present invention, and the present invention is not limited thereto.

Example 1 Wastewater Treatment Using a Single Bioreactor

The wastewater treatment apparatus using a bioreactor equipped with a nonwoven fabric filter membrane according to the present invention was carried out as follows to examine the effect of removing organic matter and nitrogen contained in the wastewater.

1. Fabrication of bioreactor

First, in order to fabricate the bioreactor as shown in Figure 2, by using a transparent acrylic cylindrical (190 L total height: 15 L) of the inner diameter of 190 mm × height, to facilitate the flow of the treated water at the bottom The reactor was constructed so as to have a 45 ° conical structure. An inner diameter of 170 mm and an effective area of 0.29 m ² and a cylindrical nonwoven filtration membrane (bag type) having an open top were installed in the reactor. At this time, the nonwoven fabric was mixed with about 65% of PET (polyethylene) and about 35% of polypropylene (PP), and a thickness of 6 mm, a unit weight of 1.06 kg / m ² , and a pore of about 100 μm were used.

The diffuser was installed at the bottom of the nonwoven fabric membrane for aeration, and the overflow pipe was installed at 63 cm height from the bottom to prevent the rise of water level due to clogging.

2. Wastewater Treatment Efficiency Measurement

After returning the sludge collected from S sewage treatment plant to a single bioreactor, the concentration of mixed liquor suspended solids (MLSS) is about 5, OO mg / L, followed by continuous supernatant of precipitated household sewage. Injected into. The treated sewage was allowed to flow out naturally after passing through the filter membrane by water head difference. At the initial stage of operation, the inflow flow rate was set to 30 L / day and the residence time was stabilized by 12 hours, and then the treatment efficiency was measured while gradually decreasing the residence time to 10, 8, 6 and 4 hours. As the experiment proceeded, the MLSS concentration in the reactor increased, but no artificial sludge disposal was carried out, and the DO concentration in the reactor was varied according to the MLSS concentration, but was aerated to maintain an average of about 4 mg / L or more.

The experiment was carried out over 225 days, the organic matter, sludge and nitrogen removal efficiency of the continuous experiment is shown in Figures 4 , 5 and 6 below.

Figure 4 is a graph showing the BOD concentration of the influent and the BOD removal efficiency after passing through the treatment apparatus of the present invention, the BOD concentration (-O-) of the incoming influent changed significantly during the operation period, BOD removal efficiency (-■-) The average of 97% was confirmed a stable result.

Figure 5 is a graph showing the SS concentration and the SS removal efficiency after passing through the treatment apparatus of the present invention, the SS concentration (-●-) of the treated water during the operation period is maintained at a low average of 2.8 mg / L to separate the solid-liquid separation It was found that no facility was needed.

6 is a graph showing the nitrogen concentration introduced and the nitrogen removal efficiency after passing through the treatment apparatus of the present invention, the removal efficiency is changed according to the water quality change of the incoming influent, but the total nitrogen removal efficiency (-■-) is 39.4% on average A stable result was confirmed.

This is compared with the conventional nitrogen removal rate of about 10-30% in conventional secondary treatment methods (WEF and ACSE, Design of Municipal Wastewater Treatment Plants , Vol. II, 4th Ed., P. 15-7 (1998)). ; Metcalf and Eddy, Wastewater Engineering , 3rd Ed., McGrall-Hill, p. 692-693 (1991))) is a result confirming the superior treatment apparatus and method of the present invention.

The excellent nitrogen removal rate shown in the above results is due to denitrification by anoxic conditions inside the microbial membrane made by microorganisms grown on the inner wall of the nonwoven fabric filter membrane.

Example 2 Wastewater Treatment Using Intermittent Aeration

The bioreactor equipped with the nonwoven fabric filtration membrane prepared in Example 1 was subjected to wastewater treatment by applying an intermittent aeration method.

In order to prevent precipitation of sludge at the time of non-aeration using the same processing apparatus as Example 1, the stirrer was further installed and it stirred continuously at the speed of 30 rpm. By connecting the timer to the blower on / off to control the aeration and non-aeration time, the experimental apparatus was installed in a constant temperature room of 20 ℃.

The reactor was operated in three stages. In the first stage, continuous aeration was carried out. In the second stage, aeration of 1/1 was carried out to determine the optimal cycle time due to the organic and nitrogen removal efficiency while continuously injecting sewage. The experiment was carried out with changing the cycle time from 3 hours, 2 hours and 1 hour in the non-aeration time ratio. In the 3rd experiment, the aeration / non-aeration time ratio was changed to 50 minutes / 70 minutes, 40 minutes / 80 minutes, and 30 minutes / 90 minutes at the optimum cycle time determined in the second stage experiment. In comparison, the optimal aeration / nonaeration time ratio was determined.

7 and 8 illustrate the effects of removing organic matter and nitrogen when the intermittent aeration operation method is applied.

7 is a graph showing the removal rate of total nitrogen according to the aeration / non-aeration time ratio, showing a total nitrogen removal efficiency of about 32% due to the denitrification in the biofilm even in the continuous aeration stage, nitrogen removal after applying the intermittent aeration The total nitrogen removal efficiency in the two-stage experiment in which the efficiency was further increased to change the cycle time was the highest when the cycle time was 2 hours. Therefore, the optimum cycle time was found to be 2 hours with the highest total nitrogen removal efficiency while maintaining high organic matter removal efficiency.

In addition, in the three-stage experiment with fixed cycle time of 2 hours and increased aeration time, total nitrogen removal efficiency was the highest at about 83% at the time ratio of 40 minutes / 80 minutes.

8silver The graph shows the change in C / N ratio and T-N and BOD removal efficiency of influent according to the aeration / non-aeration time ratio. The influent C / N ratio is expressed as the ratio of BOD to T-N. The influent C / N ratio was not constant, representing 2.8 in the continuous aeration phase, 4.5 at the 90-min / 90-min time ratio, and 3.4-3.8 at the other time ratios. However, the organic removal efficiency was more than 94%, which was stable without being affected by the C / N ratio, and the nitrogen removal efficiency was also not affected by the C / N ratio and changed according to the aeration / non-aeration time ratio. .

In this experiment, the wastewater was continuously introduced into a single reactor, so most of the organic matter from the influent water injected during the non-aeration time is used as a carbon source for denitrification. Is removed efficiently.

As described above, as a result of treating the wastewater with a wastewater treatment apparatus using a bioreactor equipped with a nonwoven filtration membrane according to the present invention, it is possible to remove organic matter and nitrogen contained in the wastewater with high efficiency and to operate the reactor. Therefore, nitrogen removal efficiency can also be improved. In addition, since the sedimentation basin does not have to be separately placed, the required land area can be reduced, and the concentration of microorganisms in the reactor can be maintained to be high, so that the weight of the treatment facility can be reduced, and the amount of waste sludge can be reduced, which is very useful in industrial applications.

Claims (11)

A biological reactor equipped with a wastewater inlet for injecting wastewater in the upper center, an air inlet for injecting air and an outlet pipe for transporting the treated water in the lower center to remove organic matter and nitrogen in the wastewater according to a biological method. In the wastewater treatment apparatus provided with a (bioreactor), A nonwoven fabric filer (nonwoven fabric filer) is installed in the bioreactor, but the filter membrane is manufactured in a form in which the lower end is blocked in the same structure as the long axis direction of the reactor, and is positioned to maintain a constant distance from the inner wall of the reactor, An air diffuser is provided at the inner lower end of the nonwoven fabric membrane for aeration of the reactor. Waste water treatment apparatus comprising a cover plate to enable the composition of the anaerobic conditions or anoxic conditions in the upper center of the bioreactor. The apparatus of claim 1, wherein the nonwoven fabric is a single material or a mixture of two or more materials selected from the group consisting of polyester, polypropylene, viscose rayon, nylon, cotton, and glass fiber. The apparatus of claim 1, wherein the nonwoven fabric has a pore size of 20 to 300 µm and a thickness of 5 to 30 mm. The apparatus of claim 1, wherein the bioreactor has a conical structure from a lower end to a predetermined position in order to smooth the flow of treated water. delete The apparatus of claim 1, wherein the bioreactor may further include a mixer inside the nonwoven fabric membrane in order to efficiently react the wastewater and the microorganisms therein. The apparatus of claim 1, wherein the bioreactor may be installed in series or in parallel in order to increase the treatment efficiency of organic matter / nitrogen. The device of claim 1, wherein the bioreactor is capable of combining with an anaerobic bath and an anaerobic bath. Injecting a microbial mixture into a bioreactor to remove organics and nitrogen in the wastewater according to a biological method; Incubating the microorganisms by introducing air while appropriately adjusting the external temperature; Introducing waste water at a constant rate into the bioreactor; In the wastewater treatment method of removing organic matter and nitrogen contained in wastewater by microorganisms under aerobic or anaerobic conditions, The wastewater is contained in the wastewater by microorganisms by being introduced into a bioreactor having a non-woven filter membrane, a diffuser at the bottom of the filter membrane for aeration, and a cover plate at the upper center to allow for the formation of anaerobic or anaerobic conditions. Wastewater treatment method for removing organic matter and nitrogen. 10. The method of claim 9, wherein the bioreactor performs intermittent aeration of aeration / non-aeration. 10. The method of claim 9, wherein the bioreactor is sealed to operate under anaerobic or anaerobic conditions.