KR20010093993A - Advanced Wate Water Treatment System of Package Type - Google Patents

Abstract

PURPOSE: A package type advanced sewage and wastewater treatment system is provided, which is simple in construction and easy to operate and can remove as well nitrogen and phosphorus as organic matter efficiently and steadily. The system can be installed at small sewage treatment system. CONSTITUTION: The system comprises the parts of a bio-reactor(1) being partitioned into indirect aeration region and direct aeration region by a partitioning wall(2) and in the indirect aeration region of which a fluidizing media(6) is filled; a partitioning wall(2) being installed at the center part; screens(2a) being installed at the top/bottom part of the partitioning wall to prevent the fluidizing media(6) from flowing into the direct aeration region; filtration modules(5) being installed in the partitioning wall(2) and one end of which is connected to the treated wastewater discharge pump(13); and an aeration device(27) being installed at the bottom of the partitioning wall(2).

Description

Advanced Wate Water Treatment System of Package Type

The present invention relates to a system for biologically removing contaminants contained in sewage wastewater. The present invention relates to a package type advanced sewage treatment system that has excellent removal efficiency of organic matter, nitrogen and phosphorus, is economical, easy to operate and manages, and is suitable for small scales such as village units. It is about.

The method of removing organic pollutants in sewage water is mainly used by the metabolic action of microorganisms, and it is divided into continuous flow type and batch type according to the reaction type.

Referring to the conventional continuous flow biological wastewater treatment process using the A ₂ O process as an example, in addition to the biological reaction tank (102, 102a, 102b) as shown in Figure 1, the sedimentation chamber 103 and the sludge conveying facility (105, 105a) and the adjustment tank (101) was needed.

The sedimentation basin 103 is a process for separating solids and clean treated water from the reaction liquid flowing out of the reaction tank 102, and is provided with auxiliary facilities such as a sludge collector 106 and a driving device 106a. The sludge is returned from the 103 to the anaerobic reaction tank 102a, which is composed of a conveying pump 105 and a conveying pipe 105a.

In addition, in a small treatment facility, the flow rate and concentration change of the inflow water is large according to the time period, so that the adjustment tank 101 and the flow adjustment tank pump 104 should be installed uniformly to maintain a stable treatment efficiency. In general, the daily sewage flow is irregularly flowed up to about 2.5 times the average time inflow rate according to the time zone, so in the absence of a flow adjustment tank, not only the treatment efficiency decreases but also the peak flow rate of the sedimentation basin. It needs to be made 2.5 times larger in accordance with the construction cost, and the processing efficiency is reduced.

As such, the conventional continuous flow biological sewage treatment process is not only economical in terms of facility cost and management cost, but also requires high skilled management by experts because sludge is bulked or injured in the sedimentation basin. It was impossible to expect in reality.

In addition, the biological reaction tank in the A ₂ O process, which is one of the representative processes of the total denitrification method using the inflowed organic matter for the denitrification reaction in relation to nitrogen and phosphorus removal, is anaerobic reaction tank 102a in which the phosphorus release reaction is performed, and anoxic acid in which the denitrification reaction is performed. It consists of aerobic reactor (102), nitrification and organic decomposition, and requires internal circulation and agitation in addition to the settling basin and sludge conveying facilities, so there are many driving parts and difficult operation management. It is difficult to apply at small scale.

In order to overcome this problem of the conventional continuous flow sewage treatment process, the batch sequencing batch sludge process (SBR), in which the inflow, biological reaction, sedimentation, and outflow are spaced in one reactor, is a small and medium sized sewage treatment plant. It was also applied to.

However, the batch process is difficult to maintain the proper conditions for each unit process because a plurality of unit processes are operated in one reactor, and it is very difficult to normalize especially when the sludge is bulking or floating. In addition, phase switching, leveling, inflow and outflow must be controlled automatically, making the equipment expensive and difficult to maintain and manage. As the operating factors such as dissolved oxygen concentration are controlled automatically within the set range, even if one operation factor is changed, the entire operation factors including cycle time are required to be reset, so that there is a lack of responsiveness to changes in inflow conditions. do. In this way, the batch activated sludge process is also required for intensive management by experts, and thus it is almost impossible to adopt in small sewage treatment facilities where expert management is difficult.

In addition, in the batch activated sludge process, the nitrification time and the anoxic reaction time per cycle are not sufficient, so it is expected to be sufficiently nitrified at the winter water temperature, or in the domestic sewage treatment where the C / N ratio is low, only the organic matter introduced during the anaerobic reaction time is appropriate. Difficult to expect, resulting in low nutrient removal efficiency.

In order to alleviate various problems caused by the conventional continuous flow or batch sewage treatment process, recently, a hollow fiber membrane filter module is deposited in an activated sludge reactor in a small sewage treatment plant to carry out a solid-liquid separation process. Submerged membrane-separated activated sludge processes are often used, which are replaced by filtration processes.

Submerged membrane separation activated sludge process is to replace the conventional sedimentation basin with hollow fiber membrane filtration module, the separation efficiency of solids is more stable and superior to the sedimentation basin, and can reduce the structure part corresponding to the sedimentation basin. However, in small-scale treatment facilities, the peak flow rate of 2.5 times the average flow rate is introduced, so an adjustment tank for adjusting the flow load is required even in an immersion type membrane separation activated sludge process. In addition, since peak dissolved loads increase untreated dissolved pollutants and deteriorate effluent quality, in order to omit the adjustment tank, the total amount of pollutants introduced per unit time in addition to the ability to cope with the flow load, that is, the pollution load variation Coping skills must also be improved.

As a method of improving the ability to cope with load fluctuations, a catalytic oxidation method in which a microbial complex is multiplyed by filling a biofilm carrier in a reaction tank is typical, and there are many advantages such as reducing the capacity of the reaction tank. In particular, in the case of the fluid carrier, there is an advantage in that it is easy to install and selectively proliferates the active microorganism. However, when the fluid carrier is charged in the reaction tank of the conventional immersion membrane separation sludge process, it is difficult to apply the fluidized bed biofilm method because the carrier and the hollow fiber collide with each other and the hollow fiber is broken or the hollow fiber and the carrier are entangled. In the case of the fixed carrier, there is no problem of collision and entanglement, but by installing a large number of fixed beds in the reactor, a catchment zone in which water and dissolved oxygen cannot reach is formed, and the fixed carrier prevents the smooth mixing of the reaction solution with the filtration module. It will act as an obstacle, there is also a problem that the pollutant is eluted due to decay of biofilm in the shooter area.

In addition, in the submerged membrane separation sludge process, a strong shear force is required on the surface of the filtration module in order to prevent the biofilm from being attached and the surface of the filtration module is closed. The stirring force of air was used to clean the surface of the filtration module. However, in the conventional reactor, since the aeration air is dispersed, the shear force is insufficient for sufficient washing of the filtration module only by supplying the air required for the biological reaction, thereby operating in an over-aeration state in which the air is excessively supplied. As such, the superaeration for the cleaning of the filtration module causes excessive assetization of activated sludge and inefficiency in which power is wasted. In addition, if the dissolved oxygen concentration in the reactor is increased due to the supersaturation in relation to the removal of nutrients, it is difficult to convert the phase into anaerobic or anaerobic conditions, and the influent organic waste is wasted in the consumption of excessive dissolved oxygen, and the efficiency of nitrogen and phosphorus removal is improved. Is degraded.

Accordingly, the present invention has been made to solve the above-mentioned problems, and can reduce facility costs and maintenance costs, and in particular, it can be applied to small wastewater treatment facilities to treat organic pollutants and nutrients efficiently and stably to clean treated water quality. The purpose is to provide a package type advanced sewage treatment system that can secure the

In order to achieve the above object, the present invention applies a conventional method of replacing the sedimentation basin, which is a solid-liquid separation means, with a filtration means such as a hollow fiber membrane. By concentrating on the filtration module without dispersing to the outside, even the small amount of aeration to smoothly wash the membrane while improving to prevent oversaturation. In addition, by filling the fluid carrier to the outside of the partition means, smoothly flowing in the reaction tank without colliding or tangling with the filtration module to improve the ability to cope with load fluctuations and to reduce the capacity of the reactor. By using the intermittent aeration device of the pump ejector method, the aeration device was able to remove nitrogen phosphorus by the intermittent aeration method as well as total denitrification by internal circulation and agitation without installing a separate pump or agitation device.

That is, a cylindrical or square partition means having upper and lower portions open to the inside of the reaction tank to suppress the diffusion of the vortex and smoothly communicate the water flow, and inside the circulating means, aeration device is installed and operated to provide a strong vortex. And a direct force device in which shear force is formed, and the outside of the partition means is partitioned so as to separate the indirect bubble device in which slow water flows into and exchanges from the direct air gun.

Wherein the vortex and shear force is generated to create a favorable condition for washing the solids from the surface of the filter module is formed by the filtration module to install the filtration module to effectively clean the biofilm formed on the surface of the filtration module, on the contrary By means of the partitioning means to reduce the effect of the shear force and to form a favorable condition for the growth of adhesion of the biofilm between the indirect bubbling filling the fluidized biofilm carrier to facilitate the growth of the attachment of microorganisms. The upper and lower portions of the partition means have a screen or net that smoothly flows the water and bubbles, but prevents the fluid carrier from flowing directly inside the bubbler, thereby preventing collision and entanglement between the hollow fiber and the biofilm carrier. It is possible to implement a system that exhibits the advantages of.

On the other hand, the fixed carrier inhibits the smooth mixing of the reaction tank and partially forms a catchment zone, so that the biofilm does not detach and decomposes, thereby deteriorating the treated water quality. In addition, the proportion of old microorganisms with reduced activity is increased, and the old microorganisms cannot be selectively disposed of.

However, in the present invention, by filling the reaction tank with the immersion type filtration module, the fluid carrier is also omitted, eliminating the installation of the settling basin, and due to the shear force according to the flow of the carrier, the aging biofilm is properly detached and the active microorganism selectively attaches and propagates. do. There is an advantage that can selectively culture the microorganisms with high activity by removing the old microorganisms that are detached and suspended with surplus sludge.

On the other hand, in the conventional treatment method in which the water level of the reactor is fixed, it is not economical because the sedimentation basin or filtration module has to be increased to a capacity that can cope with the peak flow rate. The lack of coping capacity leads to obstacles such as deterioration of processing efficiency, so adjustment tanks are inevitable in small-scale mothers with large load fluctuations.

In the present invention, by installing the filtration module to be deposited in the reaction tank, by operating the water level of the reaction tank, the reaction tank itself can provide a sewage water treatment system in which a separate adjustment tank is omitted in parallel. That is, in the time zone where the average flow rate is lowered, the reactor is operated at the low water level and the spare capacity is reserved in preparation for the occurrence of the peak flow rate. When the flow rate exceeds the average flow rate, the level of the reactor is gradually increased to operate at the full water level, and when the inflow rate decreases, the water level is lowered again, and the filtration module continues to operate at the average flow rate regardless of the inflow flow rate. will be. As such, the peak flow load can be accommodated as an increase in the water level of the reaction tank, and the peak contamination load is charged to the reaction tank so as to exert an excellent responsiveness to the load variation so that the adjustment tank can be omitted.

In relation to the removal of nitrogen and phosphorus, in the present invention, even in the configuration of a very simple device, it is possible to use the AO and A ₂ O methods which can use the influent organic matter for denitrification and dephosphorization reaction, as well as anaerobic in one reactor. And an intermittent aeration method for supplying air intermittently to repeat the aerobic condition. The intermittent aeration method is to repeat the aerobic state and oxygen-free anaerobic state where oxygen is supplied in the same reactor at a time interval, and to supply or stop the air to the aeration tank in order to repeat the anaerobic / aerobic state in the same reactor. It repeats with set time interval.

Application of the above-mentioned intermittent aeration method reduces the number of reaction tanks compared to the conventional treatment process, thereby saving mechanical construction cost, power cost, and facility management cost.In particular, unlike the conventional method in which the capacity of the reaction tank such as anaerobic tank and aerobic tank is fixed, By adjusting the time, it is possible to obtain the same effect as changing the reactor capacity in the conventional method, and thus it is possible to flexibly cope with changing the inflow conditions.

In addition, while operating the biological reaction tank by the intermittent aeration method, during the operating time of the non-aeration agitation conditions in which the denitrification reaction to stop the operation of the withdrawal pump to stop the external outflow, the influent organic matter can be used to the denitrification reaction to the maximum There is also.

In the present invention, the intermittent aeration device can be used in combination with a diffuser and a mixer, a blower and an underwater aeration device, or a pump ejector. In the pump ejector method, one or more pumps are provided in a reaction tank, and an outlet pipe extending to a pipe is installed at an outlet of the pump. The outlet pipe is provided with one or more ejectors, and an air supply pipe for supplying air to the ejector. Is connected, the air supply pipe has a structure that is installed in the air supply valve that can be automatically opened and closed in conjunction with the timer.

In addition, the intermittent aeration device in the present invention can perform the intermittent aeration as well as the internal circulation function and aeration agitation function at the same time, the device is simple and easy to manage. In the first method of internal circulation, the pump is installed in the reactor of the next stage and the ejector is connected to the pipe of the reactor of the previous stage, so that the reaction liquid of the reactor of the latter stage is reversed to the previous stage. It is to make the stirring of the reactor. The second method of internal circulation involves the installation of a pump ejector in the prestage reactor and the end of the water supply tube extending from the air supply tube so as to be immersed in the reaction liquid of the poststage reactor. As the reaction liquid of the back stage reaction tank is reversely circulated to the previous stage through the supplementary pipe, stirring is performed, and this method has an advantage that the internal circulation is automatically performed only in the aerobic stirring stage in which the denitrification reaction takes place.

1 is a schematic configuration diagram of an advanced sewage treatment system by a conventional A ₂ O process,

2 to 6 is a schematic block diagram of a package type advanced sewage treatment system of each embodiment according to the present invention.

* Description of the symbols for the main parts of the drawings *

1, 1a, 1b: biological reactor 2: compartment means

2a: Screen 3: Direct Release

4: Indirect bubble section 5: Filtration module

6: fluid carrier 7: solid-liquid separation means

8: sludge 9: supernatant

10: collection of contaminant collection reservoir 11: aeration device

12: filtered water pipe 13: filtered water pump

21, 21a, 21b: ejector pump 22, 22a, 22b: ejector

23, 23a, 23b: air supply pipe 24, 24a, 24b: air control valve

25, 25a, 25b: water flow supplement pipe 26: internal circulation pipe

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

2 is a schematic diagram of a package type advanced sewage treatment system using a single reactor according to a first embodiment of the present invention.

A partition means (2) is installed inside the reactor (1) to suppress the diffusion of the vortex and the flow of water flows smoothly, so that one reactor is partitioned into two sections. Aeration device (11), such as underwater aeration device, is installed and operated to form a direct vortex (3) to form a strong vortex and shear force, the outside of the partition means flow of water at a gentle flow rate from the direct aeration It is divided and partitioned so as to be an indirect clothing device (4) to be exchanged. A strong vortex and shear force are generated to form a favorable condition for washing solids from the surface of the object, so that the filtration module 5 is installed, but is connected to the filtration water extraction pump 13 and the filtration water pipe 12. Install. In addition, the fluid carrier 6 is filled in the indirect bubble between the indirect bubble between the effect of the shear force and the formation of favorable conditions for the growth of adhesion of the biofilm, the water flow and bubbles flow smoothly to the partition means and the fluid carrier The present invention relates to a sewage water treatment system having a screen (2a) or a net that does not allow direct passage between the apparatuses so that the fluid carrier and the filtration module do not collide or entangle.

In addition, in order to increase the efficiency of nitrogen and phosphorus removal, the reaction tank 1 supplies or stops the air in the aeration system so that it can be operated by an intermittent aeration method where the aerobic and anaerobic conditions are alternately repeated. It is installed in combination with the stirring device, and in the aeration condition, the air is ejected from the diffuser, and during aeration, the air supply is stopped and the stirrer can be configured to operate. In the present invention, various intermittent aeration devices such as a combination device of an acid pipe and an agitator, a combination device of an underwater aeration device and a blower, or a pump ejector, as well as an diffuser or an underwater aeration device can be applied without limitation.

In the present invention, the denitrification efficiency can be improved by stopping the operation of the filtered water pump by stopping the operation of the filtered water pump in a non-aeration agitation condition in which the denitrification reaction takes place so that the inlet organic matter can be used to the denitrification reaction while making the system intermittent. Will be.

In the previous stage of the biological reaction tank, an adjustment tank [not shown] may be installed to form a treatment system. However, when operating in a variable variable manner in which the water level of the reactor is changed, it is possible to omit the installation of the flow adjustment tank, so that the system can be configured more simply and compactly. Here, the filtration module may be composed of various types of membranes such as plate, semi-finished or spiral type, and the present invention may be applied to various types of filtration means without being limited to the separation membrane.

Figure 3 is a schematic diagram of an embodiment showing an intermittent aeration device by a pump ejector in a second embodiment according to the present invention.

In the aeration device in this embodiment, the discharge port of the pump 21 and the ejector 22 are connected, and the ejection port of the ejector ejects a strong stream of water to the filtration module 5 installed between the direct air catchers in the partition means 2. It is installed to be washed by the, the ejector is connected to the air supply pipe 23 is exposed to the atmosphere outside the reaction tank (1). Therefore, when the pump is operated, water flow and bubbles are ejected from the ejector, thereby washing the filtration module together with the aerobic reaction.

In the present embodiment, as an intermittent aeration means, an air control valve 24 and a water supply supplement pipe 25 may be further provided in the air supply pipe. Here, when the air control valve is opened, air and water streams are ejected from the ejector, and the reaction tank maintains aerobic conditions and at the same time washes the filtration membrane. When the air control valve is closed, only the stream of water is ejected from the ejector, so that the reaction tank is operated under anaerobic or anaerobic conditions due to aerobic agitation. At this time, the air supply is stopped in the ejector, thereby weakening the stirring power and the washing power of the filtration module. Therefore, in the present invention, the water supply supplement pipe 25 is provided in the supply pipe and when the air control valve is closed, the reaction liquid is sucked by the energy used for the air suction, and is further ejected through the ejector, thereby increasing the stirring force and the cleaning power of the filtration module. It can be maintained. Other configurations and operations are the same as those in the first embodiment of FIG.

In addition, in the previous stage of the reaction tank to install the contaminant collection reservoir 10 can prevent the failure of the system due to the inflow of the contaminants. It is common to install a removal device such as an automatic screen as a pretreatment device for removing contaminants. However, in a small processing facility, unmanned operation is inevitable from time to time, while automatic screens need to be removed from time to time. The contaminant collection storage tank has a structure that is almost the same as that of a conventional decay septic tank, and collects contaminants for a long time to store a large amount, and is temporarily removed. Thus, coarse organic matter is decayed and reduced during the storage period.

The contaminant collection reservoir can be applied not only to the first embodiment but also to the previous stage of the initial reaction tank in the third to fifth embodiments described below.

Fig. 4 relates to a third embodiment according to the present invention, which realizes a conventional AO process or an advanced processing system by intermittent aeration using a very simple device.

An anoxic reaction tank (1a) for the total denitrification reaction is installed in the previous stage of the reaction tank (1) according to the second embodiment, and the water supply supplement pipe (25a) is provided in the interior of the anoxic reaction tank to perform aerobic stirring The ejector 22a is installed, and the inlet of the ejector 22a installed in the anoxic reaction tank is configured to allow sludge conveyance and internal circulation from the biological reaction tank to the anoxic reaction tank of the ejector pump 21 installed in the biological reaction tank. It was configured to be connected to the discharge port and the inner circulation pipe (26).

Therefore, in this embodiment, the aeration of the reactor 1 and the aeration of the oxygen-free reaction tank 1a as well as the internal circulation can be performed in parallel with the operation of the ejector pump, so that the sedimentation basin, sludge transport facility separate internal circulation facility, stirring The conventional AO process can be realized even if the apparatus is omitted. In addition, the air supply valves 24 and 24a are additionally installed, so that the operation by the intermittent aeration method can be performed in parallel if necessary.

FIG. 5 relates to a fourth embodiment according to the present invention, and to another embodiment in which a conventional AO process or an intermittent aeration processing system is realized.

In the present embodiment, an ejector 22a and an ejector pump 21a provided with a water supply supplement pipe 25a for aerobic agitation are provided inside the oxygen-free reaction tank 1a, and the biological reaction tank 1 is installed from the biological reaction tank 1a. The other end of the water supplement tube is configured to be immersed in the reaction liquid of the biological reaction tank 1 so that sludge conveyance and internal circulation can be made to the oxygen-free reaction tank 1a. When the ejector pump on the anoxic reaction tank side is operated, water is sucked in the subsequent stage reaction tank 1 by the negative pressure formed in the ejector 22a and discharged to the previous stage reaction tank through the water supply pipe 25a. The internal circulation and the oxygen-free reaction tank for the stirring is made.

In addition, the ejector pump of the oxygen-free reaction tank is provided with an additional air control valve (24a) to realize intermittent aeration, by closing the air control valve when the oxygen-free reaction tank is aerobic agitation condition is also spontaneous internal circulation. This embodiment can provide an advanced sewage treatment system with a higher number of driving devices than the third embodiment of FIG.

FIG. 6 relates to a fifth embodiment according to the present invention, and further relates to an embodiment in which the intermittent aeration process is further realized in the conventional A ₂ O process.

A ₂ O process is an anaerobic reaction tank (1b) is added to the phosphate release reaction in the previous step of the AO process of the third or fourth embodiment, the return sludge with a high solids concentration is introduced in the anaerobic reaction tank, Since the denitrification reaction is performed in the anoxic reaction tank 1a, it is advantageous to introduce internal circulating water having a high nitrogen oxide concentration.

Therefore, the anaerobic reactor has a solid-liquid separation means (7), such as hydrocyclone or a simple sedimentation basin, and the solid suspension mixture drawn from the biological reaction tank, which is the final reaction tank, is separated by a solid-liquid separation means, such as a sedimentation basin or a hydrocyclone, to concentrate solids. High sludge (8) is returned to the anaerobic reactor, and the supernatant (9) having a low solids concentration is internally circulated to the anoxic reactor, whereby the apparatus is compact and dephosphorization and denitrification efficiency are improved. It can be provided.

Also in this embodiment, the anaerobic reactor and the anoxic reaction tank is installed in general stirrer or current replacement tube (25b, 25a), a pump ejector provided with a used and the aerobic reaction tank (1) is a traditional A ₂ O process by having to give up device Can be realized. In addition, in this embodiment, it is possible to further provide an intermittent aeration method by providing air control valves 25, 25a, and 25b to secure various operating methods and to cope with changes in inflow conditions smoothly.

As described above, the package-type advanced sewage treatment system according to the present invention has a simple and economical configuration of the apparatus, and the removal efficiency of nitrogen and phosphorus as well as organic matter is stable and excellent, and in particular, easy to manage and operate, It can be effectively applied to the advanced treatment of small sewage treatment facilities such as schools, independent houses, and mountain villages, which are almost defenseless on the removal of wine, which can contribute to the reduction of pollution and eutrophication of rivers and reservoirs.

Claims (13)

A compartment is installed in the reactor to prevent the diffusion of vortex and smoothly communicate the flow of water, so that one reactor is divided into two sections, and the aeration device is installed and operated to create strong vortex and shear force. The direct flow section is partitioned so that a gentle flow of water flows from the aeration section and the direct inflow section between the inlet section and the inflow section, and a strong vortex and shear force are generated to form a favorable condition for washing solids from the surface of the object. In the abandoned section, a filtration module is installed but installed to be connected to the treatment water extraction pump and the pipe, and the indirect bubble is filled with a biofilm carrier in the indirect bubble which has a favorable effect on the growth of adhesion of the biofilm due to the low shear force. Water flows and bubbles smoothly through the means, but the fluid carrier is directly High wastewater treatment system, characterized in that consisting of a screen, or a biological reaction tank equipped with a mesh body is so be passed into the interior between the mechanism. According to claim 1, The aeration device is characterized in that the pump ejector is equipped with an intermittent aeration function is aeration or aeration aeration by opening and closing the air control valve is connected to the air control valve and the water supply supplement pipe to the air supply pipe Advanced sewage treatment system. According to claim 1, wherein the biological reaction tank is operated in an intermittent aeration method, high wastewater, characterized in that to stop the outflow of the treated water by stopping the operation of the treated water withdrawal pump in the non-aeration agitation conditions in which the denitrification reaction takes place Processing system. The advanced sewage treatment system according to claim 1, wherein the biological reactor is operated in a variable position manner in which the level of the biological reactor is increased or decreased according to the change of the inflow flow rate, and the installation of the adjustment tank is omitted in the previous step. 2. The advanced sewage treatment system of claim 1, wherein the filtration module is composed of a plate, hollow fiber or spiral membrane. The advanced sewage water treatment system according to claim 1, further comprising, in the previous stage of the biological reaction tank, a complex collecting storage tank for collecting and separating contaminants such as coarse organic matter, sand, and wood chips. An anoxic reaction tank for the total denitrification reaction is installed in the first stage of the biological reaction tank of claim 1, and an ejector having a water replenishment pipe for aerobic agitation is installed inside the anoxic reaction tank, and from the biological reaction tank An inlet of the ejector installed in the anoxic reaction tank is connected to the discharge port of the internal circulation pump or ejector pump installed in the biological reaction tank so that sludge conveyance and internal circulation can be made to the oxygen-free reaction tank. The advanced sewage water treatment system according to claim 7, wherein an air control valve is connected to the stirring ejector of the anoxic reaction tank to intermittently aeration by opening and closing the air control valve. The method of claim 7, wherein the anaerobic reaction tank is further installed in the previous step of the anaerobic reaction tank, and the solid suspension mixture drawn out from the biological reaction tank, which is the final reaction tank, is separated by a solid-liquid separation means such as a sedimentation basin or a hydrocyclone. And the separated liquid having a high solids concentration is introduced into the anaerobic reactor as a return sludge, and the supernatant having a low solids concentration is introduced into the anoxic reactor as internal circulating water. An anoxic reaction tank for the total denitrification reaction is installed in the first stage of the biological reaction tank of claim 1, and an ejector and an ejector pump equipped with a water replenishment pipe for aerobic agitation is installed inside the anoxic reaction tank, the biological The other end of the water supply pipe is installed so as to be immersed in the reaction liquid of the biological reaction tank so that sludge transfer and internal circulation can be made from the reaction tank to the anoxic reaction tank. 11. The advanced sewage water treatment system according to claim 10, wherein an air control valve is connected to the agitation ejector of the anoxic reaction tank to intermittent aeration by opening and closing the air control valve. 11. The method of claim 10, wherein the anaerobic reaction tank is further installed in the previous step of the anaerobic reaction tank, the solid suspension mixture drawn out of the biological reaction tank as the final reaction tank is separated by a solid-liquid separation means such as a sedimentation basin, hydrocyclone, etc. And the separated liquid having a high solids concentration is introduced into the anaerobic reactor as a return sludge, and the supernatant having a low solids concentration is introduced into the anoxic reactor as internal circulating water. The agitation device of the anaerobic reaction tank according to claim 9 or 12, wherein the agitation device of the anaerobic reactor has an intermittent aeration function in which an air supply valve and a water supply supplement pipe are connected to an air supply pipe so that aeration or aeration of aeration is performed by opening and closing an air control valve. Advanced wastewater treatment system, characterized in that the pump ejector.