KR100466717B1 - A method and device for drawing treated water use in wastewater treatment system of SBR - Google Patents

Abstract

The present invention discloses a method and apparatus for effluent treatment of an SBR sewage treatment plant system. According to the present invention, the first bucket having a lower level than the rear wall and having a scum cutoff therein and the front and rear walls have a level higher than the front wall of the first bucket and lower than the rear wall thereof. The water flow path is formed between the first bucket and the first bucket, and the lower part is vertically installed inside the bottom bucket so as to have a higher level than the rear wall of the second bucket and the second bucket submerged in the scum block. A decanter made up of a baffle partitioned into a space and a treated water inlet space, a treated water outlet pipe pivotally supported horizontally in the reaction tank to let the treated water out, and a plurality of decanters communicating the treated water inlet space to the treated water outlet pipe Treatment water induction pipe, an actuator installed on one side of the reactor to pivot the decanter to the treatment water outlet pipe, and fixed to the treatment water outlet pipe to discharge scum to the outside Key is composed of a plurality of scum induction pipe connecting the scum inflow space of the scum discharge and a scum discharge pipe decanter.

According to the present invention, the purified treated water can be reliably blocked from being included in the scum on the surface thereof, and the scum can be removed at the same time.

Description

A method and device for drawing treated water use in wastewater treatment system of SBR}

The present invention relates to a sewage treatment system for purifying various sewage and wastewater, and more particularly, a continuous process for purifying sewage and wastewater by sequentially performing all treatment steps in one reactor by time control. Treatment water of SBR sewage treatment system that can remove scum present on the surface of water at the same time by easily draining purified biological treatment water from the sewage treatment system of Sequential Batch Reactor (SBR) method It relates to a method and a device for the discharge.

Recently, according to the development of the industrial society and the increase of population, a large amount of wastewater (hereinafter referred to as 'sewage') is being discharged from various industrial sites and households. Such sewage contains a large amount of contaminants such as various organic matters, and this causes pollution of rivers and soils, and sewage treatment is a serious social problem.

Accordingly, the sewage that is thrown away by the general households is passed through the so-called sewage treatment plant, where the pollutant is properly purified to be below a certain level and flowed to rivers to minimize water and soil pollution.

Conventional sewage treatment methods used in such sewage treatment plants include activated activated sludge (CAS) and a continuous batch reactor (SBR) method.

The activated sludge method requires separate reactors for aeration, sedimentation and treatment water discharge and the sludge is returned from the settling tank to the aeration tank for the growth of microorganisms, whereas the SBR process controls all the treatment steps in one reactor. By automatically performing continuous.

Therefore, the SBR method is most widely used because it has a simple structure and a compact installation area, high processing efficiency, and easy handling of load variation, compared to an activated sludge method.

Figure 1 schematically shows a so-called ICEAS SBR sewage treatment system called an Intermittent Cycle Extended Aeration System (ICEAS) as an example of such an SBR method.

In this technique, a baffle wall (W) is provided at one inner side of the reaction tank B, and the reaction tank B is divided into a pretreatment reaction tank B2 and a main reaction tank B1. Accordingly, the sewage is introduced into the upper portion of the pretreatment reaction tank (B2) and subsequently flows into the main reaction tank (B1) through the flow path (T) at the bottom of the baffle wall (W).

During the aeration, air is injected into the sewage stored from the air supply unit A installed at the bottom of the reaction tank B, and the injected air purifies the sewage by activating microorganisms in the sewage.

When the aeration ends, sedimentation takes place for a predetermined time, and solid and liquid separation occurs, and the sludge in the sewage sinks to the bottom, and clean water rises to the top.

When the sedimentation is completed, the treated water discharge device (D) installed on one side of the main reaction tank (B1) is lowered by a certain level, and only the clean treated water of the upper part is discharged to the outside to flow to the stream, etc., and the precipitated sludge is discharged from the sludge discharge pump. Collect and discard in accordance with (P).

On the other hand, even scrubbed water is inevitably floated on the surface of the purified water, and it is very important that the scum is discharged with the scum removed during the outflow of the treated water of the SBR sewage treatment system.

Figure 2a and 2b shows an example of the conventional treatment water outflow apparatus (D) of the SBR sewage treatment system for this. This is supported by a plurality of connecting pipes 5 in a decanter 1 having an approximately funnel-shaped cross section, which is pivotally supported in the main reactor B1 by a plurality of connecting pipes 5, and a cylindrical scum guard. The guard 2 is pivotally supported on the decanter 1 via a bracket 3 so as to be leverable and in contact with the front surface thereof. On one side of the reactor B, an actuator 6 for rotating the decanter 1 up and down is hinged to one of the connecting pipes 5.

Accordingly, as shown in FIG. 3, when the decanter 1 pivots around the outlet pipe 4 by the actuator 6 and descends, first, the scum guard 2 touches the water surface to block the scum S. If the decanter 1 is further lowered, the scumguard 2 will float on the water surface by buoyancy of the treated water, so that the decanter 1 will turn relatively in the opposite direction to the decanter 1 and only the decanter 1 will enter the water. do.

Then, the scum S floating on the water surface is blocked by the rear surface of the decanter 1 having a relatively high level relative to the scumguard 2 and the front surface, and thus the decanter 1 and the scum guard 2 Water directly below the surface of the water flows through the gap generated between the decanter 1 and the inclined opening at the top of the decanter 1 to flow out through the connecting pipe 5 and the outlet pipe 4. In this state, the decanter 1 flows out the treated water while gradually descending to a predetermined water level and then rises back to the initial position by the actuator 6.

By the way, the conventional treatment water outflow device (D) is merely to block the scum (S) to be included in the treated water by installing the scum guard (2) in the decanter (1), so the scum (S) ) Had a problem that cannot be removed.

Therefore, as the sewage treatment proceeds, scum (S) gradually accumulates in the main reaction tank (B1). Therefore, after a long time sewage treatment, the system must be stopped and a separate scum removal operation must be performed.

In addition, since the scum guard 2 first touches the water surface and then the decanter 1 continues to enter the gap between the two to form a treatment water inflow path, even if the scum blocking plate 7 exists between them, There was also a fear that scum S between the guard 2 and the decanter 1 would flow into the decanter 1.

The present invention was devised to solve the above-mentioned conventional problems, and can be easily drained while being surely blocking the scum present on the surface of the purified water from the SBR sewage treatment system so as not to be included. The purpose of the present invention is to provide a method for effluent treatment of the SBR sewage treatment system that can remove scum present in the same time.

Another object of the present invention is to provide a treatment water outlet of the SBR sewage treatment system suitable for implementing the aforementioned treatment water outlet method.

1 is a cross-sectional view schematically showing a general EBIAL sewage treatment system,

Figure 2a and Figure 2b is a side view and front view showing a treated water outflow apparatus of the conventional SB Sewage treatment system,

Figure 3 is an excerpt sectional view showing the operating state of the conventional treatment water outlet;

Figure 4 is a side view showing the treatment water outflow apparatus of the SBI sewage treatment system according to the present invention,

5 is a front view taken along line V of FIG. 4;

FIG. 6 is an enlarged cross-sectional view taken along line VI-VI of FIG. 5;

Figure 7 is a perspective view taken along the line of Figure 5,

8a to 8e are sequential cross-sectional views showing the operation of the SBI sewage treatment system treated water outflow apparatus according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10: Decanter 11: First Bucket

11a, 13a: front wall 11b, 13b: rear wall

12: treatment water inflow passage 13: second bucket

14: baffle 15: treated water inlet space

16: scum inlet 18: scum cutoff

20: treated water outlet pipe 21: treated water induction pipe

30: scum exhaust pipe 31: scum induction pipe

32: scum discharge control valve 40: actuator

B: reactor S: scum

In order to achieve the above objects, the treatment water outlet method of the SBR sewage treatment system according to the present invention is acutely deformed a treatment water inlet passage having a relatively low level inlet and a high level outlet to a decanter of a predetermined type. Forming; A process water inflow space is continuously formed at an outlet of the inflow passage so that the treated water introduced into the treatment water inflow passage is overflowed at the outlet thereof, and then connected to the treatment water outlet pipe; A scum inlet space having an inlet higher than the inlet of the treated water inflow passage and having a lower level than the outlet thereof is integrally formed and then connected to the scum discharge pipe; After the scum cut-off water is injected into the bent portion of the treated water inflow passage, the decanter is gradually lowered to allow the purified treated water to flow out of the reactor without removing the scum and to remove the scum at the same time.

In addition, the treatment water outflow apparatus of the SBR sewage treatment system according to the present invention includes a first bucket in which the front wall has a lower level than the rear wall, and the scum cutoff water is filled therein, and the front and rear walls are the first bucket. The second bucket is disposed at intervals inside the first bucket so as to have a level higher than the front wall and lower than the rear wall of the first bucket so as to form a treated water discharge path between the first bucket and the lower portion of the second bucket submerged in the scum cutoff water. And a decanter formed vertically inside the second bucket so as to have a level higher than that of the rear wall of the second bucket to divide the inside of the second bucket into a scum inflow space and a treated water inflow space. A treatment water outlet pipe disposed horizontally in the reaction tank and pivotally supported to discharge the treatment water to the outside of the reaction tank; A plurality of treated water induction pipes passing through the first bucket of the decanter to communicate the treated water inflow space of the second bucket with the treated water outlet pipe; An actuator installed at one side of the reactor to lift the decanter by pivoting the treated water outlet pipe; A scum discharge pipe which is fixed to the treated water outlet pipe and discharges the scum to the outside of the reaction tank; And a plurality of scum induction pipes passing through the first bucket of the decanter to communicate the scum inflow space of the second bucket with the scum discharge pipe.

According to one preferred feature of the treatment water outlet of the present invention, the second bucket front wall of the decanter has a level slightly lower than the rear wall, and the front walls of the first and second buckets are inclined at an angle.

Accordingly, the present invention, the SBR sewage treatment can be removed to the outside as well as to ensure that the treated water purified in the SBR sewage treatment system to prevent the inclusion of scum floating on the surface of the water as well as to remove the scum on the surface at the same time It is very effective in improving the reliability and efficiency of the system.

Such specific features and other advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

4 and 5, the treatment water outflow apparatus of the SBR sewage treatment system according to the present invention includes a decanter 10 and a decanter 10 for simultaneously flowing out purified water and scum S in the main reaction tank B1. The treated water outflow pipe 20 and the scum S introduced into the decanter 10 allow the decanter 10 to be pivotally supported in the main reactor B1 while flowing out the treated water introduced into the outside. The scum discharge pipe 30 for discharging to the outside and the decanter 10 is composed of an actuator 40 for lifting up and down the treatment water outlet pipe 20 in a predetermined angle range.

6 and 7, the decanter 10 is accommodated at intervals within the first bucket 11 and the first bucket 11 to form the treated water inflow passage 12 therebetween. The second bucket 13 and the baffle 14 which divides the inside of this second bucket 13 into the process water inflow space 15 and the scum inflow space 16 are comprised.

The front wall 11a of the first bucket 11 has a level lower than that of the rear wall 11b, and the front wall 11a has a treated water inflow formed between the second bucket 13 and the second bucket 13. It is configured to be inclined appropriately so that it can be easily introduced into the passage 12. Accordingly, the treated water inflow passage 12 is formed by being bent at an acute angle to form an approximately V shape, and the inlet has a lower level than the outlet.

The scum blocked water for blocking the scum S from entering the treated water inflow passage 12 at the initial stage when the decanter 10 is submerged in the treated water in the treated water inflow passage 12 of the first bucket 11 ( 18) is injected. The scum cutoff water 18 is injected such that at least part of the lower end of the second bucket 13 can be locked.

Accordingly, it is preferable that a drain valve 17 is provided at the bottom of the first bucket 11 to selectively discharge the scum cutoff water 18.

The second bucket 13 is also formed such that the front wall 13a and the rear wall 13b substantially form a V shape so as to correspond to the first bucket 11. The front wall 13a and the rear wall 13b of the second bucket 13 have a level higher than the front wall 11a of the first bucket 11 and lower than the rear wall 11b. The rear wall 13b forms the treated water inflow space 15 together with the baffle 14, and the front wall 13a also forms the scum inflow space 16 together with the baffle 14.

Therefore, the scum S floating on the water surface first flows into the scum inflow space 16 before the treated water overflows the rear wall 13b of the second bucket 13 and flows into the treated water inflow space 15. Preferably, the front wall 13a of the second bucket 13 has a level slightly lower than the rear wall 13b by a predetermined interval h.

The second bucket 13 does not have a side plate, and the front wall 13a and the rear wall 13b are directly joined to both side plates 11c of the first bucket 11. If necessary, a rib (not shown) can be appropriately disposed between the first bucket 11 to obtain a more stable support state for the first bucket 11.

The baffle 14 has a higher level than the rear wall 13b of the second bucket 13 so that the scum S on the water surface does not flow while the treated water overflows the rear wall 13b of the second bucket 13. The upper end is exposed on the water surface of the treated water together with the rear wall 11b of the first bucket 11 while the treated water flows out.

The treatment water outlet pipe 20 is horizontally disposed at one lower portion of the inner side of the main reaction tank B1, and one end thereof is pivotally supported by the hinge plate 22 on the side wall SW of the main reaction tank B1, and the other end is anchored. It is pivotally supported on the support block 24 via an anchor bracket 23. One end of the treated water outlet pipe 20 is connected to an external treated water outlet tank (not shown) through an outlet hole H formed in the side wall SW of the main reaction tank B1, and the other end thereof is closed.

The treated water outlet pipe 20 includes a plurality of treated water induction pipes 21 arranged in a line so as to be orthogonal to the axial direction, and each of the treated water induction pipes 21 are disposed after the first bucket 11 of the decanter 10. It penetrates the barrier 11b and is connected to the rear wall 13b of the second bucket 13 to communicate with the treated water inflow space 15.

The scum discharge pipe 30 is configured to have a smaller diameter than the treated water discharge pipe 20 and is accommodated in the treated water discharge pipe 20, and also the external scum collection tank through the withdrawal hole H of the main reaction tank B1. (Not shown).

The scum discharge pipe 30 is also provided with a plurality of scum induction pipes 31 arranged in parallel with the treated water induction pipe 21 of the treated water outlet pipe 20 so as to be perpendicular to its axial direction so that the scum inflow of the decanter 10 is introduced. Is connected to the space 16.

That is, one end of each scum induction pipe 31 passes through the treated water outlet pipe 20 and is connected to the scum discharge pipe 30, and the other end thereof is the first bucket 11 and the second bucket 13 of the decanter 10. The scum inlet space 16 of the decanter 10 communicates with the scum discharge pipe 30 by being connected to the baffle 14 through the rear walls 11b and 13b of the bottom wall.

Like the scum induction pipe 31 is also composed of a diameter smaller than the treated water induction pipe 21, like the scum discharge pipe 30, this is to minimize the flow rate of the treated water discharged unnecessarily with the scum (S).

More preferably, the scum discharge pipe 30 is provided with a scum discharge control valve 32 for properly adjusting the discharge of the scum S. This scum discharge control valve 32 is composed of, for example, a solenoid valve that can be remotely controlled.

Actuator 40 is provided with an anchor bracket 42 on one side of the upper end of the reaction tank (B), it is hinged to the treatment water induction pipe (21) located in the middle through the connecting rod (41). The actuator 40 may be configured in various ways, for example, may be configured as a screw jack (screw jack).

Next, the operation of the SBR sewage treatment system treated water outlet device according to the present invention configured as described above will be described with reference to FIGS. 8A to 8E.

First, Fig. 8A is a state in which the decanter 10 is raised to the upper side so as to be separated from the treated water, and this state is maintained while the sewage is purified in the reaction tank B. At this time, the scum blocking water 18 is injected into the first bucket 11 of the decanter 10 at an appropriate level to fill the bent portion of the treated water inflow passage 12.

In this state, after the precipitation is completed, the actuator 40 is operated downward by the control unit (not shown) to push down the treated water induction pipe 21 hinged to the connecting rod 41. Then, the treated water outlet pipe 20 having one end fixed to the treated water induction pipe 21 is simultaneously rotated in a predetermined direction so that the decanter 10 fixed at the other end thereof is lowered with the treated water outlet pipe 20 as the axis. You will turn to.

Accordingly, the decanter 10 enters the treated water in the lower portion thereof, and as shown in FIG. 8B, when the water level is initially lower than the front wall 11a of the first bucket 11, the treated water inflow passage ( Since the inlet of 12) is located above the surface of the water, no treated water is introduced.

Next, as the descending of the decanter 10 continues, as shown in FIG. 8C, the water surface is positioned between the top of the front wall 11a of the first bucket 11 and the top of the front wall 13a of the second bucket 13. In this case, the treated water is introduced into the treated water inflow passage 12 of the decanter 10, but the treated water is still lower than the rear wall 13b of the second bucket 13, so the treated water has a second bucket 13 It does not flow into the treated water inlet space (15).

At this time, as shown by the virtual line in Figure 8c, when the upper end of the front wall (11a) of the first bucket 11 passes the water surface, the treated water begins to flow into the treated water inflow passage 12 while floating on the water surface The scum S is also introduced together, but the scum S is blocked by the scum cut-off water 18 previously filled in the treated water inflow passage 12, so that the scum S does not pass through the bent portion and remains floating on the surface of the water. .

That is, the scum blocked water 18 is already filled in the treated water inflow passage 12 so that a part of the lower end of the second bucket 13 is locked, and the scum S flows along the treated water at the beginning of the inflow of the treated water. However, this is filtered while touching the water surface of the scum cutoff water 18 before passing through the bent portion of the treated water inflow passage 12.

Then, as the surface of the treated water inflow passage 12 rises with the continuous inflow of the treated water as the decanter 10 descends, the scum S also increases with the treated water inflow passage 12. When the inner surface of the water coincides with the surface of the treated water, the water flows out again to the outside of the treated water inflow passage 12, so that the scum S does not flow and remains floating on the surface of the treated water.

Next, when the water surface of the treated water is positioned at a level higher than the front wall 13a of the second bucket 13 as shown in FIG. 8D due to the continuous descending of the decanter 10, the scum S on the water surface together with the treated water. The scum inflow space 16 flows into the scum inflow space 16 of the second bucket 13, and the inflow scum S is introduced through the scum induction pipe 31 and the scum discharge pipe 30 accommodated in the treated water outlet pipe 20. It is discharged to the scum collection tank.

At this time, the scum discharged (S) is properly adjusted through the scum discharge control valve 32 provided in the scum discharge pipe (30).

And, even when the scum (S) discharge is started as described above, since the rear wall 13b of the second bucket 13 has a slightly higher level than the front wall 13a, the treated water is still treated water inflow space ( It does not flow into 15).

Subsequently, when the decanter 10 is further lowered and the rear wall 13b of the second bucket 13 is positioned below the water surface as shown in FIG. 8E, the treated water introduced into the treated water inflow passage 12 is divided into the second bucket ( 13 flows into the treated water inflow space 15 of the second bucket 13 by overflowing the rear wall 13b of the second bucket 13. Thus, the treated water entering the treated water inflow passage 12 is a clean treatment located below the water surface. Scum S is not included at all as a number.

The treated water introduced into the treated water inflow space 15 exits to the external treated water outlet tank through the treated water induction pipe 21 and the treated water outlet pipe 20. At this time, the rear wall 11b of the first bucket 11 and the upper end of the baffle 14 are exposed above the water surface, and thus the scum S cannot penetrate into the treated water inflow space 15.

Of course, even in this case, the scum S present on the water surface is continuously introduced into the scum inflow space 16 of the second bucket 13 and discharged to the outside.

On the other hand, as the treated water flows out as described above, the water level is gradually lowered. As the actuator 40 gradually lowers the decanter 10 in response to the decreasing speed of the water level, the decanter 10 continuously maintains the state as shown in FIG. 8E. While maintaining and descending, the treated water and scum (S) will flow out.

Subsequently, when the decanter 10 descends to a predetermined level, the actuator 40 stops the operation and then operates in the reverse direction to attract the treated water induction pipe 21, whereby the treated water outlet pipe 20 reversely rotates. As a result, the decanter 10 pivots upward and returns to the initial position.

In this process, when the decanter 10 exits the treated water, the treated water inflow passage 12 is filled with the treated water at a level corresponding to the inlet, and the remaining treated water is scum in the subsequent treated water outflow process. It will function as a blocking water.

Of course, scum (S) may be present on the surface of the inlet side of the treated water inflow passage 12 of the residual treated water, and such a scum (S) is also re-entered into the treated water in the subsequent treated water outflow step. If the surface of the water and the treated water coincide with each other, the same goes to the outside again, so it is not a problem at all.

However, since the treated water remaining in the treated water inflow passage 12 is filled to the inlet level, the treated water is discharged to be at an appropriate level through the drain valve 17 provided at the bottom of the first bucket 11. In addition, if necessary, after removing the remaining treated water through the drain valve 17, the new scum cutoff water 18 may be filled.

As described above, according to the method and the apparatus for outflowing the treated water of the SBR sewage treatment system according to the present invention, the inflow position level between the treated water inflow passage formed in the decanter and the scum inflow space and the treated water inflow space are different. Since the treated water and scum are separated and discharged, it is possible to easily drain only pure water while blocking the scum.

In addition, the scum floating on the water surface can be discharged simultaneously with the outflow of the treated water, thereby effectively preventing scum accumulation in the reaction tank and eliminating the need for a separate scum removal operation. It can be operated.

Therefore, the present invention has a very excellent effect that greatly contributes to the reliability of the SBR sewage treatment system and the improvement of the stability and efficiency.

Claims (7)

In the SBR sewage treatment system as a method for flowing out the purified treated water in the reaction tank to the outside, In a decanter of a predetermined type, an inlet having a relatively low level and a treated water inlet passage having a high level outlet are formed at an acute angle, The treatment water inflow space is formed in the outlet of the inflow passage so that the treatment water flowing into the treatment water inflow passage flows through the outlet and then connected to the treatment water outlet pipe. The scum inlet space having an inlet of a higher level than the inlet of the treated water inflow passage and having a lower level than the outlet thereof is integrally formed and then connected to the scum discharge pipe, Injecting a scum cut-off water in the bent portion of the treated water inflow passage, and by slowly descending the decanter to remove the scum to the outside of the reactor with the scum removed to remove the scum and at the same time to remove the scum sewage How to drain treated water from treatment system. SBR sewage treatment system is a device for flowing out the clean treated water in the reactor after sludge settled out without introducing scum, A first bucket having a lower level than the rear wall and having a scum cutoff filled therein, and an inside of the first bucket so that the front and rear walls have a level higher than the front wall of the first bucket and lower than the rear wall. It is accommodated at intervals to form a treatment water outflow passage between the first bucket and installed vertically therein so that the lower part has a level higher than the rear wall of the second bucket and the second bucket submerged in the scum cutoff water. A decanter made of a baffle to divide the inside of the second bucket into a scum inflow space and a treated water inflow space; A treatment water outlet pipe disposed horizontally in the reaction tank and pivotally supported to discharge the treatment water into the reaction tank; A plurality of treated water induction pipes passing through the first bucket of the decanter to communicate the treated water inflow space of the second bucket with the treated water outlet pipe; An actuator installed at one side of the reactor to elevate the decanter by pivoting the treated water outlet pipe on an axis; A scum discharge pipe which is fixed to the treated water outlet pipe to discharge scum to the outside of the reaction tank; And a plurality of scum induction pipes passing through the first bucket of the decanter to communicate the scum inflow space of the second bucket with the scum discharge pipe. The apparatus of claim 2, wherein the second bucket front wall of the decanter has a level slightly lower than the rear wall of the decanter. According to claim 2 or claim 3, The first and second bucket front wall of the decanter characterized in that the inclined at an angle configured to the treatment water outflow apparatus of the SBR sewage treatment system. The SBR sewage system according to claim 2, wherein the scum discharge pipe and the scum induction pipe have a smaller diameter than the treated water outlet pipe and the treated water induction pipe, and the scum discharge pipe is accommodated in the treated water outlet pipe. Treatment water outlet of treatment system. The apparatus for effluent treatment of the SBR sewage treatment system according to claim 2 or 5, wherein the scum discharge pipe is provided with a scum discharge control valve for controlling scum discharge. The treatment water outlet of the SBR sewage treatment system according to claim 2, wherein a drain valve for discharging the scum cutoff water is provided at a bottom of the first bucket.