KR100425335B1 - Wastewater treatment system using SBBR(Sequencing batch biofilm reactor) and equalization tank - Google Patents

Abstract

The present invention relates to a method for treating sewage and wastewater introduced from a flow regulating tank by using a continuous batch reactor in which a medium is introduced so as to efficiently remove nitrogen and phosphorus at the same time in a small sewage treatment facility. Function and anaerobic tank at the same time, continuous batch reactor denitrification while the flow control tank performs the role of anaerobic tank, characterized in that the anaerobic and anoxic conditions are carried out simultaneously, the continuous batch reactor and the flow control tank with the filter medium The sewage and wastewater treatment method using the wastewater treatment method is to return the concentrated sludge deposited on top of the media of the continuous batch reactor to a flow control tank serving as an anaerobic tank, and the organic matter required for phosphorus elution is not denitrified microorganisms. Nitrogen is made by the first In addition, phosphorus can be efficiently removed, and nitrifying and denitrifying microorganisms and phosphorus removing microorganisms can be dominated in different spaces to maintain the optimal SRT required for each microorganism and to increase the reaction rate. Hydraulic retention time (HRT) ensures stable water quality.

Description

Wastewater treatment method using continuous batch reactor and flow control tank with filter media {Wastewater treatment system using SBBR (Sequencing batch biofilm reactor) and equalization tank}

The present invention relates to a sewage and wastewater treatment method using a continuous batch reaction tank and a flow control tank in which a filter medium is added, and more specifically, by separating and predominantly separating and nitrifying nitrifying and denitrifying microorganisms and phosphorus removing microorganisms using a filter medium, The present invention relates to a sewage and wastewater treatment method capable of efficiently removing nitrogen and phosphorus in a small sewage treatment facility by securing organic materials necessary for phosphorus removal microorganisms using an anaerobic tank.

There are many differences in the mechanisms for biologically removing nitrogen and phosphorus from sewage and wastewater. In the case of nitrogen removal, the nitrification step of first oxidizing ammonia nitrogen (NH ₄ -N) to nitrite nitrogen (NO ₂ -N) or nitrate nitrogen (NO ₃ -N) by nitrifying microorganisms under aerobic conditions. After passing through, the nitrogen in the oxidized form is reduced (denitrification) in the form of an organic substance as an electron donor under anoxic conditions, and is blown into the atmosphere (N ₂ ) to remove nitrogen.

On the other hand, in the case of phosphorus removal, the phosphorus-removing microorganism converts ATP (adenosine triphosphate) to ADP (adenosine diphosphate) in an anaerobic condition in order to obtain energy required for the accumulation of organic matter. do. Phosphorus-removing microorganisms in aerobic conditions after anaerobic conditions use the energy obtained by oxidizing organic matter accumulated in cells to form ATP, an energy source in the body.

At this time, the phosphorus eluted under anaerobic conditions accumulates in the cell and a greater amount of phosphorus is accumulated than the eluted phosphorus, which is called luxury p uptake. Removing the phosphorus removal microorganism generated through this process can remove the phosphorus from the sewage.

In addition, nitrification and denitrification of microorganisms require long sludge retention time (SRT) because of the slow growth rate of microorganisms. Maintaining the SRT for a long time increases the nitrification and denitrification microorganisms in the system, thereby increasing the nitrification and denitrification rate and removing nitrogen even with a short residence time. However, in the case of phosphorus-removing microorganisms, the growth rate is higher than that of nitrification and denitrification microorganisms, which not only keep SRT short, but also keep SRT short because removing large amounts of phosphorus-removing microorganisms from the system removes a large amount of phosphorus. It is more advantageous.

Therefore, in the general sewage treatment process, it is impossible to selectively remove only specific microorganisms because all microorganisms exist in a mixed state. For this reason, in the case of biological sewage and wastewater treatment processes that simultaneously remove nitrogen and phosphorus, the SRT of the treatment process is generally determined by the SRT required for nitrification, which is not an optimal operation method from the viewpoint of phosphorus removal. It is an optimal process to separate and grow denitrifying microorganisms and phosphorus removing microorganisms to maintain SRT necessary for each microorganism.

On the other hand, the sequencing batch reactor (SBR) process is faster than substrate activated sludge process and can easily form anaerobic and aerobic conditions. Therefore, nitrification and denitrification can be easily performed along with organic matter removal. It is difficult to maintain a constant concentration of microorganisms, but it is difficult to maintain a constant concentration of microorganisms, and high nitrogen and phosphorus content, such as high concentration industrial wastewater, has a problem of low treatment efficiency.

On the other hand, the biofilm method has the advantages of securing microbial diversity, less influence on temperature and impact load, and no sludge bulking, but it is easy to form thick biofilms and There was a problem such as a drop in the treatment efficiency.

The present invention has been made in order to solve the above problems, it is an object of the present invention to provide a sewage and wastewater treatment method that can efficiently remove nitrogen and phosphorus in a small sewage treatment plant at the same time.

Another object of the present invention is to provide a sewage and wastewater treatment method capable of ensuring stable water quality at a short hydraulic retention time (HRT).

The above objects of the present invention are achieved by separating the nitrification and denitrification microorganisms and the phosphorus removing microorganisms and predominantly in different spaces and securing organic materials necessary for the phosphorus removing microorganisms by using a flow adjusting tank serving as an anaerobic tank. The sewage and wastewater treatment method uses a continuous batch reactor method in which biofilms are combined, and it is possible to maintain optimal SRT for each microorganism, so that the reaction speed is fast and the organic matter required for phosphorus elution can be used by the phosphorus-removing microorganism first. There is very good processing efficiency of nitrogen and phosphorus.

1 is a schematic diagram of an apparatus of one embodiment of the present invention;

2 is a diagram showing the driving cycle of the present invention,

3 is a diagram showing the inflow and outflow concentration of COD according to the operation period of the present invention,

4 is a diagram showing the inlet and outlet concentration of NH ₄ -N according to the operation period of the present invention,

5 is a diagram showing the inflow and outflow concentration of TN according to the operation period of the present invention,

6 is a diagram showing the inflow and outflow concentration of P according to the operation period of the present invention.

The present invention relates to a method of treating sewage and wastewater flowing from a flow regulating tank using a continuous batch reactor in which media is injected, wherein the flow regulating tank simultaneously performs the function of the flow regulating function and the anaerobic tank, and the flow regulating tank serves as the anaerobic tank. The continuous batch reactor while performing the denitrification, characterized in that the anaerobic and anoxic conditions are carried out at the same time, relates to a wastewater treatment method using a continuous batch reactor and a flow control tank in which the medium is added.

Such sewage and wastewater treatment methods include the steps of: depositing sludge on top of the media of the continuous batch reactor and discharging approximately 50 to 60% of the supernatant water; Discard some of the sludge settled on the top of the media of the continuous batch reactor, the remainder is transferred to the flow control tank to elute phosphorus in the anaerobic state and at the same time, the nitrate nitrogen remaining in the media of the continuous batch reactor is attached to the media layer Removing the high concentration of microorganisms through endogenous denitrification; Introducing all of the anaerobic reaction of the flow rate adjustment tank into the continuous batch reactor to remove nitrate nitrogen remaining in the continuous batch reactor by denitrification under anoxic conditions using organic materials in the influent; Removing the organic matter remaining in the aerobic reaction and inducing phosphorus intake and nitrification when the denitrification reaction is completed in the continuous batch reactor; When the aerobic reaction is completed in the continuous batch reactor, the step of carrying out the precipitation is repeatedly performed, and accordingly, the phosphorus removal microorganisms in the suspended state in the upper part of the medial layer, and the nitrification and denitrification microorganisms in the adhered state of the medial layer are dominant. It is done.

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

FIG. 1 is a schematic diagram of an apparatus for implementing the wastewater treatment method of the present invention, in which a flow rate adjustment tank 30 and a continuous batch reaction tank 40 filled with 15 to 25% of the total volume are shown.

(1) flow adjustment tank

In the present invention, the wander adjustment tank 30 is to return the concentrated sludge precipitated in the continuous batch reaction tank so that the organic matter required for phosphorus elution is first used by the phosphorus removal microorganism, not the denitrification microorganism.

The flow adjustment tank 30 performs the function of flow control and the role of anaerobic tank at the same time, while the continuous batch reactor 40 performs denitrification through endogenous breathing while the flow adjustment tank 30 performs the role of anaerobic tank Anaerobic conditions can be performed simultaneously to reduce residence time.

(2) Continuous Batch Reactor

In the present invention, the continuous batch reactor 40 is filled with 15 to 25% of the total volume of the filter medium 42, when the filter medium is less than 15% of the total volume of the continuous batch reactor 40 water treatment efficiency is If the amount is lower than 25%, the treatment efficiency is not improved anymore, so it is not economical.

When the filter medium is a fixed bed filter, it is positioned at the bottom of the reaction tank, and by supplying air to the upper and lower portions of the filter bed layer and continuously washing it by a method such as installing an air injector to suppress the formation of a thick biofilm, In the case of the filter medium, backwashing is not necessary by performing mixing to maintain the suspended state or by supplying air to the lower part to suppress the attachment of excessive microorganisms.

At this time, as the stationary phase media, as shown in Table 1 below, the clay is primed, and the price is low, and the porous clay having a particle size of 8 to 16 mm and specific gravity of 1.1 g / cm ³ is a simple air supply. It is possible to backwash as well as to secure a high concentration (about 10,000mg / L) of microorganisms, it is preferable as the suspended phase media as shown in Table 1 below, the size is 12 × 12 × 12㎣ and specific gravity 0.06 g / A cellulose sponge (cm ³ ) having a small specific gravity is preferable because it can maintain a suspended state with a small power even when microorganisms are attached, and can secure microorganisms of about 8000 mg / L.

However, in the present invention, the media used to secure the microorganism in the attached state is not particularly limited thereto, and all conventionally known ones may be used.

Physical properties of the media Statue Porous clay Cellulose sponge Diameter, particle size (mm) 8 to 16 12 × 12 × 12 cubic Specific surface area (m ² / m ³ ) 250 - Specific gravity (g / cm ³ ) 1.1 0.06

The upper portion of the filter medium layer, which occupies 75 to 85% of the total volume of the continuous batch reactor, grows in a microorganism in a suspended state, and coexists with denitrification and nitrification microorganisms detached from some media in a state of predominantly phosphorus-removing microorganisms.

The present invention configured as described above includes the following methods to efficiently remove nitrogen and phosphorus in a small sewage treatment plant.

(1) A hybrid system in which microorganisms in adhered state (biofilm) and microorganisms in suspended state coexist.

The present invention constructs a hybrid system in which adherent microorganisms and suspended microorganisms coexist using media to maintain optimal SRT for nitrogen and phosphorus removal.

In the present invention, the advantages of the nitrogen-removing microorganism and the phosphorus-removing microorganism in each of the medial layer and the medial layer upper portion of the continuous batch reactor are made through the following simple modifications, which will be described in detail with reference to FIG. 2.

When the microbial treatment of the influent water is completed in the continuous batch reactor 40, 50 to 60% of the supernatant is discharged through the precipitation process. The sludge precipitated on the upper part of the filter medium is returned to the total flow rate adjusting tank 30, and the anaerobic reaction is caused by the returned sludge in the flow rate adjusting tank 30. At the same time, in the continuous batch reactor 40, the nitrate nitrogen remaining in the filtering layer is filtered. It is removed through endogenous denitrification of high concentrations of microorganisms attached to the layer. The concentrated sludge of the flow adjusting tank 30 is introduced into the continuous batch reactor 40 with the raw water after the anaerobic condition, and is used for elution, and the organic nitrate remaining in the continuous batch reactor 40 using the organic matter in the remaining influent. Is removed through denitrification. When the denitrification reaction is completed in the continuous batch reactor 40, aeration is carried out to remove the remaining organic matter and induce phosphorus intake and nitrification. When the reaction of the continuous batch reactor 40 is completed, the precipitation is carried out to discharge some of the supernatant water and discard some of the sludge remaining on the upper portion of the media, and the rest is introduced into the flow adjusting tank to cause the anaerobic reaction.

By repeating this operation one or more times, the upper portion of the filter media layer of the continuous batch reactor 40 is dominated by phosphorus-removing microorganisms, and the filter media layer is dominated by nitrification and denitrification microorganisms.

Accordingly, the phosphorus-removing microorganisms on the upper filter media layer can be easily removed through a certain residence time, and the nitrification and denitrification microorganisms attached to the filter media can stay in the continuous batch reactor for a long time to maintain the optimum SRT of each microorganism. Will be.

(2) Securing organic matter necessary for the removal of phosphorus microorganisms by using the flow adjustment tank.

For phosphorus elution in sewage and wastewater treatment, it is advantageous to first make it possible to use volatile fatty acids (VFACOD) which are easily biodegradable. However, when a large amount of nitrate nitrogen is present in the sludge, anoxic conditions are formed, and organic materials necessary for phosphorus removal microorganisms are consumed for denitrification. Therefore, organic matter is not available to phosphorus removal microorganisms, resulting in poor phosphorus elution and ultimately difficult removal of phosphorus.

In the present invention, the concentrated sludge precipitated on the upper portion of the media of the continuous batch reactor was returned to a flow adjusting tank serving as an anaerobic tank, so that the organic matter required for phosphorus elution was first used by the phosphorus removing microorganism, not the denitrifying microorganism.

Although this will be described in detail with reference to the embodiment of the present invention, the present invention is not limited thereto.

Example 1

1) The raw water of the flow adjusting tank was introduced into a continuous batch reactor in which porous clay was added at about 20% of the total volume to the lower part of the reactor, and microbial treatment was performed.

2) After completion of the reaction of the continuous batch reactor, about 60% of the supernatant was discharged through solid-liquid separation.

If the discharge of the treated water in the SBR process is more than 60%, sludge washout may occur, and thus the treated water may deteriorate. Therefore, it is preferable to discharge 50 to 60% of the symbol water.

3) Discard about 10% of the sludge remaining on the top of the media of the continuous batch reactor and transfer the remainder to the flow adjusting tank to elute phosphorus in anaerobic condition and at the same time filter the nitrogenous nitrate remaining in the media of the continuous batch reactor. It was removed through endogenous denitrification of the high concentration of microorganisms attached to it.

At this time, the flow adjusting tank reacted with the returned sludge and the raw water introduced first to produce an anaerobic reaction. During the reaction time of about 2 hours, 3 times of phosphorus elution occurred and about 30% of the COD was removed.

Experimental results showed that the dissolution rate was 2.33 mgP / gMv / hr.

During the anaerobic reaction of the returned sludge, in the continuous batch reactor, the nitrate nitrogen remaining in the media was removed through endogenous denitrification, so that the anaerobic reaction and the anaerobic reaction proceeded simultaneously to reduce the residence time.

4) The concentrated sludge of the flow adjusting tank was introduced into the continuous batch reactor together with the raw water, and the nitrate nitrogen remaining in the continuous batch reactor was removed by denitrification under anoxic conditions using organic materials in the influent.

As a result, the denitrification rate in the anaerobic condition of the continuous batch reactor was 2.25mgN / gMv / hr. During the reaction time of about 1.5 hours, about 25% of COD was removed and 100% of nitrate nitrogen remaining in the media was removed.

5) After the denitrification reaction was completed in the continuous batch reactor, organic matter remaining in the aerobic reaction was removed, and phosphorus intake and nitrification were induced.

The MLSS (Mixed Liquor Suspended Solid; activated sludge concentration) of the aerobic process was maintained at about 2500 mg / L.

The rate of nitrification was 5.2 mgN / gMv / hr in the continuous batch reactor, and the intake rate of excess phosphorus eluted under anaerobic conditions was 1.57 mgP / gMv / hr.

After about 3 hours of reaction time, COD was 80%, NH ₄ -N was 98%, and TP showed 75% removal efficiency.

6) After the aerobic reaction was completed in the continuous batch reactor, the precipitate was settled for about 1 hour, and then 60% of the supernatant was discharged, and about 10% of the sludge remaining in the upper portion of the media was discarded, and the rest was transferred to the flow adjusting tank.

Tables 2 and 3 below show the specifications and operating conditions of the operation cycle and the continuous batch reactor in Example 1 above.

Operation cycle (time) of Example 1 Flow adjustment tank Continuous Batch Reactor Total time anaerobe Anaerobic Exhalation Sedimentation Sludge Return to Outflow Flow Adjustment Tank Example 1 2 1.5 3 One 0.5 8

Specifications and operating conditions of the continuous batch reactor of Example 1 Reactor Reactor volume (L) when influent flow rate is same Treated Water Discharge (%) SRT (day) HRT (hr) Example 1 Continuous Batch Reactor 32 60 10-25 12.8

Test Example 1

In the continuous batch reactor of Example 1, the concentration of the microorganisms in the adhered state of the filter medium layer and the microorganisms in the suspended state of the upper filter layer was measured.

According to the test results, the concentration of the microorganisms in the suspended state in the upper part of the filter bed was about 2,500 mg / L and the concentration of the microorganisms in the attached state of the filter bed was about 10,000 mg / L, which accounted for 20% of the total volume of the continuous batch reactor. The amount of microorganisms in the filter media layer was about 50% of the total amount of microorganisms in the continuous batch reactor.

In addition, even in the case of suspended phase media, the concentration of microorganisms in the suspended state at the top of the media layer is 2,000 mg / L and the concentration of microorganisms in the adhered state of the media layer is 8,000 mg / L. All of the oily media can secure a large amount of microorganisms, so it can be seen that it is resistant to load fluctuations and can perform nitrification smoothly in winter.

Test Example 2

In order to determine the degree of microbial advantages in the filter medium layer and the filter medium layer in the continuous batch reactor of Example 1, the dissolution and intake rate of phosphorus, nitrification and denitrification rate were measured by the following batch experiment.

1) At the end of the aerobic condition, the suspended sludge was removed, the filter medium was removed and washed to obtain the adhered microorganisms, and then the concentrations of the suspended and attached microorganisms were adjusted to approximately the same concentration.

2) Sludge and sewage are mixed 1: 1 with each of the suspended microorganisms and the attached microorganisms. First, phosphorus is eluted in the anaerobic state first, and then each side is divided into two reactors to determine the denitrification rate. Put the NO ₃ -N stock solution as a reagent and put the other side in aerobic conditions for nitrification and phosphorus intake rate and sampled over time and analyzed.

As a result of the test, as shown in Table 4, the dissolution rate and intake rate of phosphorus in the suspended state in the upper layer, the nitrification and denitrification rate appeared high in the state of attachment of the media layer, phosphorus removal microorganisms in the media layer, Denitrification and nitrification microorganisms have been shown to dominate.

Therefore, in the present invention, since nitrification and denitrification microorganisms predominate over the phosphorus removing microorganism in the attachment state of the filter medium layer, backwashing is unnecessary, thereby reducing the cost and operating cost required for the auxiliary device for backwashing.

Reaction speed between the upper layer and the media layer in a continuous batch reactor Top of media layer (floating state) Media layer (attached state) Phosphorus Dissolution Rate (mgP / gMv / hr) 2.13 1.04 Phosphorus Intake Rate (mgP / gMv / hr) 1.79 0.47 Nitrification Rate (mgN / gMv / hr) 2.89 3.16 Denitrification Rate (mgN / gMv / hr) 1.55 2.10

Test Example 3

Water treatment efficiency

1) The concentration of the influent and the effluent of Example 1 was measured and shown in Table 5 below.

Influent and Effluent Concentrations of Example 1 Influent Example 1 pH 7.5 7.2 COD _Cr sum 230 mg / L 15 mg / L receptivity 140 mg / L 10 mg / L SS sum 70 mg / L 10 mg / L volatility 40 mg / L 6 mg / L nitrogen TN 35 mg / L 15 mg / L TKN 35 mg / L 7 mg / L NH ₄ -N 20 mg / L 0.5 mg / L NO ₃ -N - 8 mg / L sign sum 5 mg / L 1.3 mg / L receptivity 4 mg / L 1 mg / L

2) Organic matter removal efficiency

The inflow and outflow concentrations of COD according to the operation period of Example 1 were measured and shown in FIG. 3.

As a result of the test, organic matter was discharged constantly regardless of the load of inflow water, and the organic matter removal efficiency was about 93%.

3) Nitrogen removal efficiency

Inflow and outflow concentrations of NH ₄ -N according to the operation period of Example 1 were measured and shown in FIG. 4.

As a result of the test, the nitrification problem did not occur even at low temperature due to securing a large amount of MLSS, and the removal efficiency of NH ₄ -N was 98%.

The inflow and outflow concentrations of TN according to the operation period of Example 1 were measured and shown in FIG. 5.

As a result of the test, when the TN concentration was 80 mg / L, the nitrification rate was 87%, and the NH ₄ -N concentration in the effluent was 10 mg / L, and the TN was 50 mg / L, and about 30 mg / L of nitrogen was removed. However, phosphorus removal worsened due to the increase of NO ₃ -N in the effluent.

4) Phosphorus Removal Efficiency

The inflow and outflow concentrations of phosphorus according to the operation period of Example 1 were measured and shown in FIG. 6.

As a result, the outflow concentration of phosphorus was over 1mg / L, and the removal efficiency of phosphorus was 74%.

Comparative Example 1

Sequencing Batch Reactor (SBR) Process

The general SBR process was carried out according to the specifications and operating conditions of the reactor shown in Table 5.

The operation cycle was adjusted after releasing 60% of the supernatant water in the continuous batch reactor in which the reaction was completed.

Comparative Example 2

SBR process with controlled demass

According to the specifications and operating conditions of the reaction tank shown in Table 5 below, by placing a continuous batch reactor and a NO ₃ -N storage tank to increase the amount of supernatant discharge, denitrification to induce denitrification and to minimize the inhibitory effect on the phosphorus-removing microorganisms A controlled SBR process was performed.

At this time, after discharging 60% of the symbol water, 20% of the symbol water was stored in the NO ₃ -N reservoir to operate.

Specifications and operating conditions of each reactor in Comparative Examples 1 and 2 Reactor Reactor volume (L) when influent flow rate is same Treated Water Discharge (%) SRT (day) HRT (hr) Comparative Example 1 Continuous Batch Reactor - 50-60 15-80 - Comparative Example 2 Continuous Batch Reactor 50 60 25 28 NO ₃ -N reservoir 20 -

Test Example 4

Water treatment efficiency comparison

The removal efficiency of COD, NH ₄ -N, TN and TP in Example 1 and Comparative Examples 1 and 2 was measured and shown in Table 7 below.

% Removal efficiency COD NH ₄ -N TN TP Example 1 93 98 57 74 Comparative Example 1 96 94 - 41 Comparative Example 2 96 98 60 75

As a result of the test, the removal efficiency of the organic material, NH ₄ -N, and TN showed similar efficiencies as in Example 1 and Comparative Examples 1 and 2, but in the removal efficiency of TP, Example 1 of the present invention was superior to Comparative Example 1. And similar efficiency as in Comparative Example 2.

The wastewater treatment method using the continuous batch reaction tank and the flow control tank to which the media of the present invention is introduced, as described above, predominates nitrifying and denitrifying microorganisms and phosphorus removing microorganisms in different spaces to obtain an optimal SRT for each microorganism. As it can maintain and increase the reaction rate, stable water quality can be secured at a short hydraulic retention time (HRT).

In addition, the present invention is to return the concentrated sludge precipitated in the upper portion of the media of the continuous batch reactor to the flow control tank to perform the role of anaerobic tank so that the organic matter required for phosphorus elution can be used by the phosphorus removal microorganisms, not denitrified microorganisms first, so that not only nitrogen but also phosphorus Can be removed efficiently.

In addition, the present invention can reduce the cost and operating costs required for the auxiliary device for backwashing, because no separate backwashing is necessary during continuous batch reactor operation.

Claims (5)

In the method for treating sewage and wastewater flowing from the flow regulating tank using a continuous batch reactor with a filter medium, the flow regulating tank performs the function of the flow adjustment and the anaerobic tank at the same time, the flow regulating tank performs the role of the anaerobic tank During the continuous batch reactor while denitrification, characterized in that the anaerobic and anoxic conditions are carried out at the same time, sewage and wastewater treatment method using a continuous batch reactor and a flow control tank in which the medium is added. The method of claim 1, further comprising the steps of: depositing sludge on top of the media of the continuous batch reactor and discharging approximately 50-60% of supernatant; Discard some of the sludge settled on the top of the media of the continuous batch reactor, the remainder is transferred to the flow control tank to elute phosphorus in the anaerobic state and at the same time, the nitrate nitrogen remaining in the media of the continuous batch reactor is attached to the media layer Removing the high concentration of microorganisms through endogenous denitrification; Introducing all of the anaerobic reaction of the flow rate adjustment tank into the continuous batch reactor to remove nitrate nitrogen remaining in the continuous batch reactor by denitrification under anoxic conditions using organic materials in the influent; Removing the organic matter remaining in the aerobic reaction and inducing phosphorus intake and nitrification when the denitrification reaction is completed in the continuous batch reactor; When the aerobic reaction is completed in the continuous batch reactor, the step of carrying out the precipitation is repeatedly performed, and accordingly, the phosphorus removal microorganisms in the suspended state in the upper part of the medial layer, and the nitrification and denitrification microorganisms in the adhered state of the medial layer are dominant. Sewage / wastewater treatment method using a continuous batch reactor and a flow rate adjustment tank into which a filter medium was added. The wastewater treatment method according to claim 1 or 2, wherein the filter medium is introduced so as to occupy 15 to 25% of the total volume of the continuous batch reactor. According to claim 1 or 2, wherein when the filter medium is a fixed bed filter, the air is supplied to the upper and lower portions of the filter bed layer, and in the case of the floating filter medium, mixing or lowering is performed to maintain a floating state. A method for treating sewage and wastewater using a continuous batch reactor and a flow control tank in which air is supplied, characterized in that air is supplied to the tank. The wastewater treatment method according to claim 1 or 2, wherein the filter medium is porous clay or cellulose sponge.