KR20010079307A - A system and a method for treating waste water - Google Patents

Abstract

PURPOSE: An advanced sewage treatment system and a treatment method thereof are provided to reduce installation cost and effectively remove sewage by reducing treatment load and preventing adhesion of scale or moss without diffusing settled sludge. CONSTITUTION: A sewage retaining tank(10) is in anoxic condition. Sewage is flown from one side of the sewage retaining tank(10) through a filter(20) which is capable of backwash. A sewage inflow unit(50) inflows the filtered sewage at a constant flow rate without diffusing sludge settled at the bottom. Treatment water obtained by aeration and settlement of the sewage is discharged outside by more than one treatment water discharge units(60).

Description

Sewage advanced treatment system and its treatment method {A SYSTEM AND A METHOD FOR TREATING WASTE WATER}

The present invention relates to a sewage, sewage or manure (hereinafter referred to as 'sewage') treatment apparatus, by reducing the BOD-SS load of the reactor by filtering before the sewage flow into the reactor, the size of the reactor can be reduced It facilitates construction and reduces costs, while the inflow of sewage into the reaction tank and discharge of treated water from the reaction tank hardly causes the sludge settled in the reaction tank to increase the treatment efficiency of the sewage, thus enabling the precise treatment of sewage. An advanced treatment system and a method of treating the same.

In general, several methods for treating sewage are known. One of the representative sewage treatment methods is biological sewage treatment, that is, standard activated sludge process. However, this standard activated sludge process is very useful in treating the organic matter contained in the sewage by treating the sewage through several stages such as the inflow of the sewage, the first precipitation, the aeration stage, the second precipitation, and the discharge. In the treatment of nitrogen (N) and phosphorus (P), which are problematic in the treatment, there is a problem that the efficiency is quite low.

Meanwhile, a treatment method for efficiently treating nitrogen (N) and phosphorus (P) contained in sewage, that is, a BARDENHPO method for simultaneously removing nitrogen and phosphorus, and an A / O method for treating P mainly, A ₂ / O method is known.

However, the standard activated sludge method and various methods for treating the N and P are proceeded separately from the biological treatment step (aeration tank) and the solids separation step (sedimentation tank), so that the number of installations of each aeration tank and sedimentation tank is increased and the installation thereof is increased. Since the scale also needs to be installed on a large scale, it takes considerable time and money to construct a sewage treatment apparatus, that is, a sewage treatment plant or a small and medium sewage treatment apparatus.

In addition, in order to solve this problem, a sewage treatment method using a single reaction tank that performs the aeration and precipitation steps in one reactor is known. In Korea Patent Publication No. 10-268368, a related long-term aeration process is disclosed. have.

That is, while the inflow of sewage is made continuously, two aeration and sedimentation steps are performed in one single reactor, and the discharge of the supernatant is intermittently performed.

However, in such a sewage treatment method using a single reactor, since the aeration and precipitation steps are performed in one single reactor, the BOD-SS load of the single reactor is high, and thus there is a limit to reducing the size of the single reactor itself. There was a cumbersome problem in that the amount of dissolved oxygen had to be adjusted variably according to aeration stage 1 and 2.

Moreover, since the supernatant is discharged through a pumping operation using a conventional discharge device, that is, a DECANTER floating on the surface of the supernatant water, the diffusion of the sludge settled in a single reactor is easily generated, which leads to sewage. It is to reduce the efficiency of processing.

Therefore, it would be more desirable to reduce the BOD-SS load of a single reactor by greatly filtering the sewage flowing into the single reactor to greatly reduce the size of the single reactor, and to prevent sludge spreading as much as possible during the inflow of sewage and discharge of treated water. .

The present invention has been made in order to improve the various problems as described above, the object of the first is to filter the sewage and then introduced into the reaction vessel by reducing the waste water BOD-SS treatment load of the reaction vessel by more than 50%, the size of a single reactor The present invention is to provide an advanced sewage treatment system that can reduce the cost and facilitate the construction, reduce the construction cost, and provide an individual sewage treatment system such as an apartment complex.

In addition, another object of the present invention is to reduce the BOD-SS load of the sewage while efficiently removing organic matter, nitrogen and phosphorus in the sewage by using the advanced sewage treatment system, the sewage inflow into the reactor and discharge of treated water without the diffusion of sludge. The present invention provides a method for advanced sewage treatment to increase sewage treatment efficiency.

1 is a schematic diagram showing the overall configuration of the advanced sewage treatment system according to the present invention

Figure 2 is a schematic diagram showing the sewage treatment step by the inventor system.

Figure 3 shows a filter device used in the present wastewater treatment system,

(a) is a perspective view showing a filter device

(b) is a state diagram showing the state of filtration of filter equipment

(C) is a state diagram showing the backwash state of the filter device

Figure 4 shows the sewage inflow device of the present inventors sewage treatment system,

(a) is the overall configuration

(b) a schematic top view

5 shows other embodiments of the present inventors' inlet device,

(a) is a schematic diagram showing a state of increasing the flow rate of sewage by the inclined partition member

(b) is a schematic diagram showing a state of adjusting the discharge direction of the sewage by adjusting the length of the bottom partition member

Figure 6 is a schematic diagram showing a conventional sewage inlet device for comparison with the present inventors inlet device

Figure 7 shows the treated water discharge device of the present inventors sewage treatment system,

(a) is a front configuration diagram showing the overall configuration of the discharge device

(b) is a main structural diagram showing another moving structure of the discharge device using a screw.

8 is a view showing a conventional discharge device for comparing with the present inventors discharge device,

(a) is a schematic diagram showing the configuration

(b) is a schematic diagram for explaining a problem caused by the flow of the conventional discharge device in the reaction vessel

9 shows a redox device that is additionally installed in the present sewage treatment system,

(a) is a schematic structural diagram showing its internal structure

(b) and (c) are related graphs for explaining the operation of the redox device.

Explanation of symbols on the main parts of the drawings

1 .... sewage treatment system 10 ....

20 .... Backwash filter device 26 .... Filter container

30 ... flexible filter material 40 ... reactor

50 ... Inlet 54 ... Bulkhead member

60 .... outlet 64 .... outlet

70 .... redox-harmony 76 .... voltanic cell

80 .... sludge treatment pipe 90 .... oxygen supply pipe

As a technical aspect for achieving the above object, the present invention, an anaerobic sewage retention tank; And,

A backwash filter device which is connected to one side of the holding tank to filter the introduced sewage and at the same time, backwash to remove the filtered contaminants; And,

A sewage inlet device connected to the filter device and installed at one side of the sewage filtered by the filter device at a predetermined flow rate without spreading the sludge settled in the lower portion, and treated water formed by aeration and sedimentation of the sewage By providing an advanced sewage treatment system consisting of: a reaction tank having at least one treated water discharge device installed to move up and down under the surface of the treated water so as to discharge the sludge deposited in the lower portion to the outside without diffusion. .

In another aspect, the present invention, the sewage retention step of retaining the sewage;

The sewage introduced through the retention step is filtered while passing through the filter bed of the filter device, while the contaminants attached to the filter material are removed by the introduced washing fluid, and the backwashing of the filter device is performed to continuously filter the filtered sewage into the reactor. Letting filtration and backwashing step;

A wastewater inflow step of introducing the filtered wastewater at a constant flow rate into the reactor without spreading the sludge deposited through the inflow apparatus;

Sewage treatment step of the continuous inflow of sewage is made, the aeration step of the microorganism is activated by the dissolved oxygen supplied into the reaction tank and the biological treatment of sewage is made, and the sedimentation step of the sludge precipitated in the anaerobic state to form the treated water; And,

By treating the water formed through the sewage treatment step through the discharge port in a natural discharge method to discharge the sludge settled in the lower part of the reaction vessel; by the advanced sewage treatment method consisting of.

Hereinafter, an embodiment of the present wastewater advanced treatment system will be described in more detail.

Figure 1 shows the overall configuration of the present advanced wastewater treatment system 1, the wastewater advanced treatment system 1 of the present invention is largely in the retention tank 10 and the filter device 20, and flows into the interior The apparatus 50 and the treated water discharge device 60 may be divided into a single reactor 40, in addition, the reactor 40 additionally includes a redox device 70, such as the present wastewater advanced treatment system Looking at each component (apparatus) 10, 20, 40, 50, 60 of (1) in detail as follows.

First, the retention tank 10 is shown in FIG. 1, which is disposed at a position where the initial sewage flows into the front of the system 1 and consists of a conventional water tank. The upper part is provided with a screen (12) to filter the contaminants more than 10-20 mm contained in the sewage.

Next, a filter device such as the filter device 20 used in the system 1 of the present invention is disclosed in Korean Patent Publication No. 10-241198, etc., which is attached to the filter device 20 according to the present invention. That is, with reference to Figures 1 and 3 as follows.

First, Figure 1 shows the installation state of the filter device 20, Figure 3 shows the filter device 20 in detail, the filter device 20 used in this invention is largely filter container ( 26) and flexible filter material (30).

That is, as shown in Figure 3, the cylindrical filter container 26 made of SUS or PVC material flanges 22, 24 is mounted, the upper flange 22 is connected to the pipe for the sewage inflow or pollutant discharge (22a) In addition, the lower flange 24 is connected to the discharge pipe (24a) of the filtered sewage and the inlet pipe (24b) through which the washing water and air are introduced, and the fine hole through which the sewage or the washing water passes through the container 26 ( 28a is disposed with the filter holder 28 formed, the flexible filter material 30 is connected between the filter holder 28 and the lower flange 24.

Therefore, as shown in FIG. 3B, when the waste water of a constant pressure is pumped out from the holding tank 10 (FIG. 1) through the connecting pipe d and the inlet pipe 22a, the filter holder 28 is opened. Descend to PE, PP. The weft-shaped flexible filter material 30 formed of nylon or the like is compressed to form the filter layer F, and finally, the sewage passing through the filter layer F through the fine holes 28a of the filter holder 28. Contaminants contained in the filter material 30 is attached to the filtered sewage is discharged through the discharge pipe (24a).

On the contrary, as shown in FIG. 3C, when the wastewater inflow is stopped and the washing water / air is sequentially injected through the lower inlet pipe 24b, the filter holder 28 is raised to the pressure and is integrally flexible filter material. 30 is also spread out, and contaminants adhering to the filter material are forced off and sent to the external concentration tank through the pipe 22a, so that the backwash of the filter device 20 is performed, for example, 60 Minute filtration / 3-4 minutes backwashing allows the sewage treatment plant to run for a considerable period of time without replacing the filter unit.

On the other hand, in the system 1 of the present invention, it is possible to use a flat membrane filter device or any other filter device capable of backwashing. For example, although not shown in the drawing, the domestic utility model registration publication No. 20-220279 discloses the filter. By connecting the filter material of the device between the upper and lower porous plates in the vessel, and connecting the piston to the upper porous plate, the filter material can be compressed and expanded smoothly as a piston to increase the filtration capacity of the sewage and make the backwash more quickly. One backwashable filter device is disclosed. In the system (1) of the present invention, it is also possible to use the filter device disclosed in the above-described utility model equipped with a piston, and to select appropriately according to the processing capacity and the processing environment. Would be desirable.

Next, Figure 1 shows the reaction tank 40 of the system 1 of the present invention, such a reaction tank 40 is installed as a single reaction tank 40 performing the aeration-precipitation-discharge step at the same time, the reaction tank The sludge treatment pipe 80 and the oxygen supply pipe 90 for the microbial aerobic operation in the reaction tank 40 are connected to the 40.

Next, in Figures 1 and 4 is connected to the inlet device 50 installed in the reactor 40 of the present invention system 1, that is, the filter device 20, and the filtered sewage is cascaded without diffusion of the settling sludge. The sewage inflow device 50 is installed on one side of the reaction tank 40 to be introduced therein.

That is, as shown in Figure 4a, the inlet device 50 of the present invention is the sewage through the filter device 20 is introduced and is fixed vertically to one side of the reaction tank 40, the sewage outlet 52a at the lower end It is formed as a body 52 and a plurality of partition members 54 which are stepped downward in the body 52.

And, as shown in Figure 4b, the outer side of the body outlet (52a) is provided with a rubber plate 56 that is elastically in close contact with the bottom portion of the reaction tank 40 surrounded by the outer portion of the body 52 have.

Therefore, as shown in Figure 4a, the sewage introduced through the inlet pipe 51 installed in the connecting pipe (d) connected to the filter device 20 to the upper side is not rapidly introduced into the reaction tank, the body 52 Since it flows stepwise through the partition members 54 inside and pushes the lower rubber plate 56 to flow into the reactor 40 along the bottom of the reactor 40, the flow rate of the sewage is kept constant, thereby maintaining the reaction tank ( It is to prevent the spread of sludge deposited in 40) as much as possible.

However, as shown in FIGS. 5A and 5B, when the inflow apparatus 50 of the present invention adjusts the length of the inclined direction or the lower partition wall member 54 ′ of the partition wall member 54 in the body 52, It is also desirable to be able to adjust the inflow state of the sewage, that is, the flow rate and the discharge direction of the sewage flowing along the partition member 54, which can smooth the sewage treatment work because it controls the sewage flow rate and its inflow amount. will be.

On the other hand, Figure 6 shows a conventional inlet device 151 for the introduction of the reaction tank, the inlet pipe (d) installed inside the partition wall 1440 of the reaction tank 140 by the pumping (P) operation through the retention tank 110. Since the sewage is introduced into the reaction tank 40 through the inlet device 151 at the bottom thereof, the incoming sewage is flow rate when the sewage flows into the pressure applied according to the pumping operation compared to the inlet device 50 of the present invention. And it is difficult to control the flow rate, and in particular, there is a problem of spreading the precipitation sludge in the reaction tank 40 more, after all, the sewage inlet device 50 of the present invention to allow the sewage to stably flow into the reaction tank (40).

Next, FIG. 1 and FIG. 7 show the treated water discharge device 60 of the present inventor system 1, as shown in FIG. 7A, inward of the vertical stand 62a installed vertically in the reactor 40. When the moving block 61b vertically moving to the cylinder 61a installed in the upper slab 42 of the reactor 40 moves in the vertical direction, the connecting bar 62b connected through the opening 62c of the vertical stand 62a. ) Is vertically moved to enable vertical movement of the discharge device (60).

However, this vertical movement structure of the discharge device 60 is fastened to another structure, that is, a screw bar 61a 'driven as a motor not shown in the figure inside the vertical stand 62a as shown in FIG. 7B. The movable block 61b may be disposed and the connecting bar 62b may be fixed to the movable block 61b '. Of course, the vertical movement structures described above are not limited thereto, and the drawings are also illustrated. Although not shown in detail, if only the connecting portion of the movable block (61a) (61a ') and the connecting bar (62b) is formed in the bellows shape after covering the sealing cover on the outside of the vertical pole (62a), It would be desirable to prevent contamination and corrosion of the installation.

Of course, although not shown in the drawings, it is also possible to adjust the discharge amount of the treated water by arranging a plurality of discharge device 60 in the longitudinal direction of the reaction tank 40, connecting rod (not shown) to move up and down as a cylinder or screw bar Multiple baffles 62 may be provided at the same time, and at the same time, the plurality of discharge devices 60 may be variably arranged in accordance with the depth of the treated water level so that the treated water may be discharged through the discharge device 60 corresponding to the level of the treated water. It will also be possible to discharge.

However, in the system 1 of the present invention, the water level control in the reaction tank 40 affects the sewage treatment, and the discharge device 60 of the present invention has a predetermined depth at the level of the treated water in a natural discharge method without a separate pumping operation. Since the treated water is discharged through the discharge device located at, the vertical movement of the discharge device 60 needs to be precisely controlled. For this purpose, although not shown in the drawing, through several water level sensors and control units, It would be desirable to control the operation of drive means such as screw bars or cylinders.

On the other hand, as shown in Figure 7a, the connecting bar 62b is connected to a baffle 62 of a rectangular frame shape for constant discharge of the treated water, the reaction tank 40 inside the baffle 62. The low-capacity reduction motor 68a installed at the lower side of the slab 42 and the cover 64a connected to the wire 68b are hinged 64b to the bracket 64c mounted on the baffle 62. When the motor 68a is driven and the wire 68b is pulled or lowered, the cover 64a opens or closes the outlet 64 fixed inside the baffle.

That is, after the cover 64a opens the discharge port 64 and discharges the treated water by the wire 68b raised as the speed reducer 68a, the discharge port 64 is lower than the side wall portion of the baffle 62. Since the outlet 64 is always located under the surface of the treated water, and when the reducer 68a reverses to loosen the wire 68b, the cover 64a rotates the hinge axis by the water pressure to discharge the outlet ( 64) Cover and seal.

In addition, when the discharge water discharge amount of the treated water is adjusted so that the discharge outlet 64 is always located below the surface of the treated water when the discharged water is discharged, the operation of closing the discharge port of the cover 64a is always performed stably. Although described as a wire, it may be possible to open and close the cover by connecting a thin rod in order to more accurately open and close the cover instead of the wire.

However, as described above, the reduction motor 68a is also connected to the driving means such as the strand bar or the cylinder through a control unit so as to adjust the length of the wire 68b by interlocking with each other when the discharge device 60 moves up and down. It would also be desirable.

Of course, the driving method of performing the vertical movement of the discharge device 60 using the cylinder (61a) or screw bar (61a ') has been described, but if the frequency of the treated water (W) in the reactor 40 is variable In some cases, it may be possible to simply adjust the upper and lower positions on the vertical stand 62a by using a fixing pin, and the like, although schematically illustrated in the drawing, an opening portion is formed at the bottom of the baffle 62 to provide buoyancy. It will be possible to stably move the baffle 62 up and down without receiving the lifting force.

Therefore, when the discharge port 64 is opened by the rotation of the lid 64a, the treated water is discharged naturally without any pumping operation by the water pressure of the water until the water level of the treated water is lowered through the baffle 62. Through the discharge port 64 is discharged to the outside of the reaction tank 40 through a plurality of flexible pipes (66a) and the discharge pipe 66 connected thereto.

On the other hand, Figure 8 illustrates a conventional decanter, that is, the discharge device 160, such a conventional discharge device 160, the principle of the check valve in the lower portion of the vessel 161 floating on the water tank 140 level The sealing ball 162 as described above is a discharge structure using the pumping pressure discharged through the opening 164 and the outlet 166 during the operation of the pump (P).

Therefore, a separate machine room 144 for pumping (P) operation is required, and because the pump (P ') is installed in the reaction tank, space with the reaction tank is required, and the cost of using the underwater pump (P') There is a problem such as an increase, and above all, the problem is that the treated water is discharged by the pumping operation, so that the conventional discharge device 160 has a rapid change in water pressure compared to the discharge device 60 of the present invention, the reaction tank 140 The sedimented sludge in the gas is easily diffused, which eventually delays the sewage treatment, and the discharge device 60 of the present invention solves these conventional problems.

And, as shown in Figure 8b, because the conventional decanter 160 is operated in a floating state on the water surface, it must be fixed to the wire on the slab 142 of the reactor 140, often decanter 160 is slab There is a problem flowing into the lower portion of the 142 to delay the sewage treatment operation, the discharge device 60 of the present invention is connected to the vertical stage 62a, so the conventional decanter flow problem does not occur.

Next, a device such as a redox-harmony 70 additionally installed and used in the reactor 40 in the system 1 of the present invention is disclosed in Korean Patent Publication No. 10-188328. Looking at the redox device 70 of the invention with reference to the accompanying drawings, that is, Figures 9a-9c are as follows.

First, as shown in FIG. 9A, the redox device 70 is flange-connectable and has a cylindrical body 72 made of porous metal, that is, SUS, a ceramic film 74b disposed therein, and an inner side thereof. Volta batteries (76) are installed in the plurality of tanks (VOLTANIC CELL) 76, the voltaic battery 76 is installed in the longitudinal direction inside the PTFE membrane (74c) in the cylindrical body 72, such a voltaic battery 76 consists of a zinc rod 76a and a silver alloy coil 76b wound thereon.

In addition, the redox device 70 may be installed as a flange to be installed so that water flows therein, or may be disposed in the reactor 40 as in the present invention, for example, to oxygen supply pipes 90. The connection is fixed and placed in the reactor 40.

In addition, the zinc rod 76a of the voltaic battery is a (+) electrode, and the silver alloy coil 76b having one end connected to the zinc rod is a negative electrode, and the other end of the zinc rod 76a is connected to the cylindrical body 72. To enable electrolysis, such a redox (oxidation / reduction) action through the voltaic battery 76 will be described in detail in the redox step (S43) of the sewage treatment method.

As a result, the redox device 70 disposed in the reactor 40 in the system 1 of the present invention electrolyzes the water to achieve soot water. According to the surface electrode state of the cylindrical body 72, it is possible to remove odor and to prevent scale generation.

Hereinafter, the sewage advanced treatment method using the advanced sewage treatment system 1 of the present invention will be described in detail by dividing each step (S1-S5).

First, as shown in FIG. 2, in the advanced sewage treatment method of the present invention, the sewage inflow is continuously performed, and the sewage treatment step (S4) of the aeration step (S41) and the precipitation step (S42) is repeatedly performed and discharged. Step S5 is made intermittently and the aeration-sedimentation-discharge is circulated in one cycle.

First, in the sewage retention step (S1), the sewage is introduced into the retention tank 10 and is retained for a predetermined time. At this time, oxygen is not supplied. The constriction removed or smaller therethrough may be precipitated primarily in the retention bath.

Next, the sewage filtration step (S2) of the present invention is a step having a characteristic effect in the sewage treatment step of the present invention, by filtering the sewage flowing from the retention step to the filter device 20 to determine the B0D-SS value of the sewage By lowering, the BOD-SS treatment load of the reactor 40 is reduced.

That is, a flexible weft type filter made of PE, PP, nylon, or the like by the filter holder 28 descending in the container 26 of the device 20 by the pressure of the sewage introduced into the filter device 20. Ash 30 forms a narrow filter layer (F) so that the contaminants contained in the sewage passing through it is attached to the filter material 30 is a filtration step of the sewage is performed.

In addition, in the filter device 20 of the present invention, when the washing water and air are injected at a high pressure through the lower side of the container 26, the filter holder 28 is raised, and the compressed flexible filter material 30 is expanded. Contaminants in the sewage attached to the filter material 30 are discharged through the upper portion of the container 26 so that the backwashing step is quickly performed. As described above, the piston is compressed to expand and expand the filter material 30. Other filter devices used may be possible.

Therefore, since the filter device 20 can be backwashed in a short time when the operation efficiency of the filter device due to contaminants generated during the filtration decreases, filtration and backwashing are repeatedly performed without replacing the filter device 20. Since short backwashing is performed for 3-4 minutes after the filtration operation of about 60 minutes, the actual sewage treatment system 1 can filter the sewage without replacing the filter device 20 to allow continuous inflow into the reaction tank 40. Let's do it.

As a result, since the BOD-SS treatment load of the reaction tank 40 is reduced by 50% or more, when comparing the present invention with the conventional inflow of sewage into the reaction tank without the usual filtration for treating the same amount of sewage, It is possible to reduce the size drastically and to make normal sewage treatment even if the size is reduced, so it is easy to construct a small and small sewage treatment system, which is very useful as a small and medium sized sewage treatment system such as an apartment complex. will be.

In addition, although the size of the filter device 20 may vary depending on the amount of filtration of sewage, and the number of installed water may vary, when the plurality of cylindrical filter devices 20 are installed in parallel, the sewage treatment capacity increases, so that the amount of sewage treatment can be adjusted as desired. Thereby, the sewage filtered continuously in the reaction tank 40 can be introduced.

Next, in the sewage reaction tank inlet step (S3) of the advanced sewage treatment method of the present invention, the filtered sewage is introduced into the reaction tank 40 through the inlet 50 installed in the reaction tank 40 without diffusion of the settling sludge.

That is, the sewage filtered through the filter device 20 flows into the reaction tank 40 at a constant flow rate as the sewage flows down stepwise through the partition member 54 installed stepwise of the inflow device 50, in particular, the bottom. Since the portion is constantly introduced through the rubber plate 56, the filtered sewage is eventually minimized as the sludge settled in the reaction vessel 10 when the filtered sewage flows into the reaction vessel 40, which increases the treatment efficiency of the sewage. do.

Next, in the wastewater aeration step (S41) of the sewage treatment step (S4) of the present invention, the oxygen of about 0.5-2 mg / l through the blower (B) and the oxygen supply pipe 90 installed in the reaction tank 40 first. a, at this time by the supply of dissolved oxygen, the reaction vessel 40 within the micro-organisms active in addition reduces the waste water of COD and BOD filtered through an organic substance oxidation process and, the nitrification of nitrogen becomes actively made NH ₃ to supply - -> Produced by N0 ₂ -N, NO ₃ -N and denitrified in the next precipitation step S42 and discharge step S5 to remove nitrogen (N).

Then, when the microorganisms excessively ingest phosphorus (P) and the sludge is removed in the next precipitation step S42, phosphorus is completely removed, and in this precipitation step (S42), organic matter is accumulated and phosphorus is released, and the precipitation step In (S42), if precipitation occurs for a predetermined time in the anaerobic state in which oxygen supply is stopped, supernatant water, that is, treated water is formed.

In addition, in such a precipitation step S42, denitrification is performed by evaporation of nitrogen (N ₂ ) gas, so that nitrogen (N) is completely removed.

In addition, the aeration and sedimentation step (S41) (S42) of the sewage treatment step (S4) to perform the step at an appropriate time to increase the removal efficiency of nitrogen and phosphorus, in the present invention already filtered step (S3) ), The sewage treatment efficiency through the reactor stage is high.

Next, the sewage treatment step (S4) of the present invention is carried out redox step (S43) (oxidation / reduction step) of the sewage using the redox device 70 precipitated in the reaction tank 40, as described above Likewise, the zinc rod 76a of the voltaic battery 76 installed in the porous cylindrical body 72 made of metal such as SUS is a positive electrode, and one end thereof is connected to the other, and the other end is connected to the cylindrical body 72. The coil 76b is connected to the negative electrode.

Thus, the redox using a voltaic cell 76 of the apparatus 70 when performing the electrolysis of the waste water is reduced degradation of H ₂ O than the reduction of the H ⁺ ion been followed H ⁺ and OH ^- there is a ionogenic , that is, ^{_{H 2 O + 2e - ->}} H + + 2OH - is, after water activation (ACTIVITY) is made and, bacteria that cause bad smell of the waste water, the water film that covers the DNA, i.e., fine particles, H ₂ O By destroying the membrane, odor of filthy water caused by bacteria and fine particles is reduced.

Next, when briefly as the 9b and 9c Poor bake graph (Graph Pourbaik) describes the principles of the voltaic cell (76), the straight line B in Figure 9b that is the generation of hydrogen response, 2H ^{+ +} 2e -> H ² shows the standard potential of the reaction. In the process of lowering the standard potential value to the Y region of the straight line B while the PH is constant using the voltaic battery 76, the surface of the cylindrical body 72 of the porous metal becomes negative and hydrogen is released. generated by removing the fine particles, and the straight line a has a standard potential of oxygen (O ₂₎ according to the PH change that is, the oxygen generating reaction _{O 2 + 4H 2 h + 4e} - - There> represents the standard potential of the 2H ₂ O, wherein Using the voltaic battery 76 increases the standard potential value to the X region in a constant PH state, the surface of the cylindrical body 72 of the porous metal is anodic to generate oxygen, which is accompanied by the activation and sterilization of microorganisms.

In addition, when iron is in contact with water, iron is oxidized to iron oxide (Fe ₂ O ₃ ) by oxygen included in the water to cause corrosion. As shown in FIG. 9C, the iron oxide has a pH of 6-7. It can be seen that the standard potential exists in a region of about +0.4 V, wherein the nuclear power generated by the ceramic film 74b installed in the redox apparatus 70 used in the present invention increases the pH of water. By lowering the surface potential of the water, the standard value is -0.4--0.9 V while the PH value is about 9-13 on the surface of the cylindrical body 72, and finally the iron is in a passive state. Fe ₃ O ₄ in the state (Z region in FIG. 9b) of is to prevent the corrosion sikieo change.

In addition, the calcium present in the natural number of (Ca ₊₎ and bicarbonate (HCO ₃₎ is the electric potential and maintains equilibrium with positive and negative ion ^{_{2HCO 3 - + Ca ++ ->}} CaCO 3 + H 2 O + CO 2 Since it is generated as a by-product of CaCO ₃ to generate a scale phenomenon, converting the surface polarity of the cylindrical body 72 from (+) to (-) through the voltaic battery 76 weakens the adhesion of the by-products It can be prevented from sticking to equipment such as scales or moss.

That is, in the redox step (S43) of the present invention, in the wastewater treatment step (S4) of the aeration (S41) and sedimentation (S42) to remove the odor of the sewage, and to prevent the scale and activation of microorganisms sewage treatment efficiency To increase it further.

Next, the treated water discharge step (S5) in the sewage treatment method of the present invention is a step of discharging the treated water formed through the aeration step S41 and the settling step S42 for a predetermined time, as a discharge device 60 disposed in the reactor (40) It is discharged to the outside of the reactor without diffusion of sedimentation sludge by natural discharge method without additional pumping operation.

That is, the discharged water outlet 64 located in the baffle 62 of the discharge device 60 disposed below the surface of the treated water is discharged intermittently by opening and closing the lid 64a. As described above, in the present invention, the discharge step of discharging the treated water by the conventional pumping operation is spontaneously discharged by the water pressure of the treated water, thereby hardly causing the diffusion of the settling sludge, thereby increasing the sewage treatment efficiency.

At this time, it is important that the treated water is naturally discharged without a pumping operation in the present invention, it is important to always be located below the level of the treated water, it is important to arrange a certain depth at the treated water level in the treatment water discharge Since the arrangement of the discharge device 60 is to be adjusted in advance according to the size of the reaction tank and the inflow and discharge amount of the sewage, which is adjusted according to the position of the discharge device 60, which in turn This is because it affects, and as described above, it is also important to allow the discharge device 60 to move variably in the reaction tank 40 in accordance with the water level so that the treated water is always discharged.

However, in the treatment water discharge method using the decanter 160 (FIG. 8) suspended in the treatment water surface by the conventional pumping operation, the sludge in the reaction tank 40 cannot be avoided due to the pressure generated by the pumping. Sewage treatment efficiency is low.

Hereinafter, an embodiment of the present invention will be described.

EXAMPLE

First, 50 m3 of sewage was introduced into the holding tank 10, and was supplied to the filter device 20 described above by a pumping operation while remaining for 480 minutes without supplying oxygen, wherein the filter device 20 had a sewage treatment capacity of 50 tons. A total of five filter apparatuses 20 having a flow rate were connected and filtered while passing sewage through each filter apparatus 20 at a pressure of approximately 1.5-2.5 kgf / cm 2, where the B0D-SS result of the filtered sewage was It is shown in Table 1.

BOD-SS result of filthy water filtered as filter device division Sewage before filtration (raw water) Filtered Sewage (Treated Water) % Removal Remarks SS (mg / l) 92 1 or less 99 COD (mg / L) 40 11 72.5 BOD (mg / l) 56 12.1 78.4 T-N (mg / l) 30.4 18 40.1 T-P (mg / L) 7.2 0.07 99

At this time, the filtration time was 60 minutes, the backwash time was 3-4 minutes, as shown in Table 1, after the sewage is filtered it can be seen that the load BOD-SS load was reduced by more than 80%, of the present invention When applied to the advanced sewage treatment method, it can be seen that the BOD-SS load can be reduced by at least 50%, which in turn can reduce the size of the reactor 40 or, in the case of using a reactor of the same size, the sewage treatment time. To shorten it.

That is, according to the sewage treatment method of the present invention, when treating the same amount of sewage, the size of the reactor is reduced compared to the conventional sewage treatment methods, or when using the same size of the reaction tank, the treatment time is more It can be shortened.

Next, the filtered sewage is continuously introduced into the reaction tank 40 through the inlet device 50, and at this time, the organic matter is supplied through the aerobic reaction of the microorganism by supplying dissolved oxygen of 0.5-2 mg / l through the oxygen supply pipe 90. The aeration step for removing phosphorus and nitrogen was carried out for 120 minutes.

Next, the anaerobic step of stopping the oxygen supply for 60 minutes to proceed to the precipitation step to form the treated water (W), discharged the treated water through the discharge device 60 installed below the water level of the treated water (W) At this time, sewage was continuously introduced into the reactor and treated water was intermittently discharged at intervals of 60 minutes while undergoing 120 minutes of aeration and 60 minutes of precipitation.

Therefore, the result of the sewage treatment method of the present invention through the above examples is shown in Table 2 below.

division General Standard Activated Sludge Process Advanced sewage treatment method of the present invention Influent Treated water % Removal Influent Treated water Removal rate BOD (mg / l) 136 30 78 148 3.2 97 COD (mg / l) 95.5 15 85 65.5 4.4 93 SS (mg / l) 140 30 79 127.1 One 99 T-P (mg / l) 4.2 3.8 10 6.5 0.9 86 T-N (mg / l) 38.3 35 9 46.5 5.4 88

Accordingly, according to the advanced sewage treatment method of the present invention, the BOD, SS, COD of the sewage is removed by an average of 95% or more, in particular, nitrogen (N) and phosphorus (P) is also removed by 87% or more, so that the sewage treatment efficiency is improved. It is quite high.

As described above, according to the present inventors' advanced sewage treatment system and method for treating the same, the filtered sewage is introduced into the reaction tank, so that the BOD-SS treatment load of the reaction tank can be reduced by at least 50% or more, and the reaction tank is treated based on the same treatment amount. It is possible to reduce the size of the building, and eventually to build a small and medium sized sewage treatment system (device) and to reduce the construction cost.

Next, when the filtered wastewater flows into the reaction tank and the treated water formed through the wastewater treatment step is discharged, the sludge deposited on the bottom of the reactor is not diffused, so that the wastewater can be efficiently treated more quickly.

Finally, as a redox device installed in the reaction tank, it is possible to remove odors in the sewage as well as to prevent adhesion of scales or lichens, and to activate water to make the sewage treatment by microorganisms more smooth, thereby enabling higher quality water treatment. To provide.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of this can easily know.

Claims (14)

An anaerobic sewage retention tank 10; and, A filter device (20) capable of backwashing and filtering the sewage introduced and connected to one side of the holding tank (10) to remove filtered contaminants; And, A sewage inlet device 50 connected to the filter device 20 and installed on one side of the sewage filtered by the filter device to flow at a predetermined flow rate without spreading the sludge deposited at the bottom; Reactor 40 having at least one treated water discharge device 60 installed to move up and down under the surface of the treated water so as to discharge the treated water formed by sedimentation to the outside without spreading the sludge precipitated at the bottom. Sewage treatment system consisting of: The filter device (20) of claim 1, wherein the filter device (20) is disposed between the retention tank (10) and the reaction tank (40), and has a filter holder (28) that is internally movable in response to incoming sewage or washing fluid. Filter container 26; And a plurality of layers connected between the filter holder 28 and the lower portion of the container 26 to be compressed as the filter holder 28 descending upon the inflow of sewage, and expanded by the filter holder 28 rising upon the inflow of washing water and air. Flexible filter material (26); including, the filter device 20, sewage filtration and advanced sewage treatment system, characterized in that configured to be backwashed to remove contaminants. The filter holder 28 of the filter device 20 is formed of upper and lower porous plates disposed in the container 26, and the filter material 30 is connected between the upper and lower porous plates. The upper perforated plate is connected to a piston mounted to the outside of the container 26, the filter device 20 is a sewage advanced treatment system, characterized in that configured to increase the filtration capacity of sewage According to claim 1, The inlet device 50, The body 52 is fixed vertically to the inside of the reaction tank 40 to filter the sewage filtered from the filter device 20; And a partition member 54 arranged stepwise in the body 52 to introduce the sewage into the reaction tank 40 at a constant flow rate. The sewage altitude is characterized in that the sewage flows into the reaction tank at a constant flow rate. Processing system. 5. The partition wall member 54 of the sewage inflow device 50 is configured to adjust the length of the inclined direction or the lower partition wall member 54 'to adjust the flow rate of the sewage or the discharge direction of the sewage. Sewage treatment system. According to claim 1, wherein the treated water discharge device 60, Baffle (62) which is installed to move up and down under the surface of the treated water in the reaction tank (40); And a discharge port 64 installed inside the baffle 62 to open and close as the cover 64a to intermittently discharge the treated water in the reaction tank 40 without pumping operation. Advanced sewage treatment system, characterized in that configured to discharge treated water without diffusion. 2. The reactor according to claim 1, wherein the reaction tank (40) comprises: a cylindrical body (72) which is flange-connectable and made of a porous metal material; and a ceramic film (74b) provided inside the cylindrical body (62) to generate far infrared rays; And a voltaic cell 76 having a plurality of tanks installed inside the ceramic film 74 and comprising a zinc rod 76a fixed to the inner center of the body and a silver alloy coil 76b wound thereon. Sewage treatment system, characterized in that it further comprises a redox device (redox-harmony) including; The reaction tank (40) according to claim 1, wherein the reaction tank (40) comprises a single reaction tank in which aeration, precipitation, and discharge are performed in one tank, and the reaction tank (40) includes a precipitation sludge treatment pipe (80) and a reaction tank (40). Advanced sewage treatment system, characterized in that the oxygen supply pipes 90 for microbial aerobic action are connected to each other Sewage retention step (S1) for retaining the sewage; The sewage introduced through the retention step is filtered while passing through the filter bed of the filter device, while the contaminants attached to the filter material are removed by the introduced washing fluid, and the backwashing of the filter device is performed to continuously filter the filtered sewage into the reactor. Sewage filtration and backwashing step (S2); Sewage inflow step (S3) for introducing the filtered sewage at a constant flow rate into the reaction tank without spreading the sludge precipitated through the inlet; A continuous inflow of sewage is made, the aeration step (S41) that the microorganism is activated by the dissolved oxygen supplied in the reaction tank is a biological treatment of the sewage, and the precipitation step in which the sludge is precipitated in the anaerobic state to form the treated water (S42) Sewage treatment step (S4); And, The advanced sewage treatment method comprising: a treated water discharge step (S5) for discharging the treated water formed through the sewage treatment step in a natural discharge method without spreading the sludge deposited in the lower part of the reactor through the discharge port. The filter material according to claim 9, wherein in the filthy water filtration step, contaminants contained in the filthy water are passed through the filter layer F of the flexible filter material compressed by the filter holder lowered by the pressure of the filthy water introduced into the filter device. Attached to and filtered, In the backwashing step, contaminants attached to the flexible filter material are removed by washing water and air introduced at high pressure through the lower side of the filter device, and backwashing of the filter device is performed. 10. The method of claim 9, wherein in the wastewater inflow step, the wastewater filtered through the filter device flows stepwise through the partition member of the inflow device and is always introduced into the reaction tank at a constant flow rate so that the wastewater is not diffused without spreading the sludge deposited in the lower portion of the reactor. Sewage advanced treatment method characterized by flowing in 10. The method according to claim 9, wherein in the aeration step of the sewage treatment step, proper oxygen breathing of the microorganisms is maintained as dissolved oxygen supplied into the reaction tank, so that organic matter oxidation and nitrification are performed, and excessive intake of phosphorus (P) by the microorganism is achieved. , In the precipitation step, microorganisms ingesting phosphorus excessively in an anaerobic state in which oxygen supply is stopped are precipitated as sludge, sludge is treated through a treatment tube, and nitrogen and phosphorus are removed by denitrification due to evaporation of nitrified nitrogen gas. Sewage treatment method characterized in that 10. The method of claim 9, wherein in the treated water discharge step, when the discharge port located below the surface of the treated water is opened as a cover, the treated water is discharged in a natural discharge method without a separate pumping operation to open and close the discharge outlet without spreading the precipitated sludge. Sewage treatment method characterized by the discharge of sewage intermittently depending on the state 10. The method of claim 9, wherein in the wastewater treatment step, the wastewater is electrolyzed as a redox device disposed in the reaction tank, and oxygen or hydrogen is generated as the surface of the cylindrical body of the redox device is cathode or anodized to remove organic matter, remove odor, and Sewage treatment method characterized in that it further comprises a sewage redox step (S43) to prevent the scale