KR101080805B1 - Apparatus and method for combined sewer overflows treatment - Google Patents

Abstract

PURPOSE: A combined sewer overflow processing apparatus and method are provided to efficiently process and separately store high-concentration overflow water in the initial rainfall and discharge the processed overflow water after the conclusion of the rainfall. CONSTITUTION: A combined sewer overflow processing apparatus comprises a center separation channel(210), a high-concentration overflow water storage tank(220), and a low-concentration overflow water storage tank(230). The center separation channel, comprising a high-concentration overflow water inlet(211) and a low-concentration overflow water inlet(212), transfers overflow water drawn into an intake conduit. The high-concentration overflow water storage tank separates the high-concentration overflow water, which is drawn into the high-concentration overflow water inlet, into high-quality water and sludge. The low-concentration overflow water storage tank receives and separates the low-concentration overflow water, which is drawn into the low-concentration overflow water inlet, and the high-quality water, which is drawn into a high-quality water overflow port(223), and separates the water into liquid and solid.

Description

Apparatus and method for combined sewer overflows treatment

The present invention relates to a combined sewage pipe overflow water treatment apparatus and method, and more specifically, it is possible to efficiently separate and store high concentration overflow water generated during the early rainfall without separate control facilities, and to discharge during the rainfall by the discharge of the processed overflow water at the end of the rainfall The present invention relates to a combined sewage pipe overflow treatment system and method for minimizing the pollution load caused by the overflowed water flowing into the discharge system.

As the management of point sources from existing homes and workplaces has advanced, such as the development of advanced sewage treatment technologies and increased sewerage rates, the share of pollution loads on non-point sources, especially contaminated sewage overflows generated during rainfall, has increased.

Looking at the structure of a conventional general confluence sewer system, as shown in Figure 1, the monthly water flowing through the conduit conduit 110 is configured to be transferred to the sewage treatment plant 130 through the rainwater tosoil 120 to be treated. At this time, the flow rate of the overflow water that can be treated in the sewage treatment plant 130 is a flow rate corresponding to the planned sewage in rainy weather, and is generally up to three times the design flow rate of the sewage treatment plant 130, and the remaining overflow water is by-passed in the rainstorm soil 120. Passed and discharged to the discharge system 140, such as rivers. Accordingly, there is a recent trend of increasing interest in the storage technology that can temporarily store the flow rate is bypassed in the stormwater.

In this regard, <Storage System and Storage Device> disclosed in Korean Patent Laid-Open Publication No. 2008-4647 considers the characteristics of the combined sewage pipe overflow water with high pollution concentration at the beginning of rainfall, and monitors the water quality in real time in the dwelling house in real time. A method of separating and controlling low concentration overflow water is presented. However, since the technology relies on electronic measurement and control devices, there is a problem that the whole system may malfunction when an abnormality occurs in the device. In addition, there is a problem that the operation performance of the sewage treatment plant may be lowered because the high concentration overflow water is transferred to the sewage treatment plant and treated with the end of the rainfall without special measures against the stored high concentration overflow water.

Meanwhile, <Underground Structure for Storage Tanks and Rainwater Treatment Method Using the Same> disclosed in Korean Patent Registration No. 810691 proposes a method of structurally separating and storing high concentrations of overflowed and low concentrations of overflowed water according to the flow rate of sewage pipes. The technique has the limitation that no adequate separation can be achieved when high concentrations of overflow water occur during heavy rains.

The present invention has been made in order to solve the above problems, can be efficiently stored and stored by treating the high concentration overflow water generated at the beginning of the rain without a separate control facility and flows into the discharge water system at the time of rainfall by discharging the processed overflow water at the end of the rainfall It is an object of the present invention to provide a combined sewage pipe overflow overflow treatment apparatus and method that can minimize the pollution load caused by overflow water.

Combined sewage pipe overflow water treatment apparatus according to the present invention for achieving the above object is a central separation channel for conveying the monthly water flowing into the drainage conduit, high concentration overflow water storage tank for storing the high concentration overflow water flowing from the central separation channel, and the central separation water It comprises a low concentration overflow water storage tank for storing the low concentration overflow water flowing from the furnace and a flocculant mixing tube which is provided on one side of the high concentration overflow water storage tank to mix the high concentration overflow water and flocculant to induce floc formation of the solid material contained in the high concentration overflow water It features.

A separation wall is provided in the high concentration overflow water storage tank, and the overflow water discharged downward through the flocculant mixing pipe may be turned upward by the separation wall. In addition, an inclined plate may be provided in the high concentration overflow water storage tank to promote solid-liquid separation.

The high concentration overflow water storage tank and the low concentration overflow water storage tank are disposed adjacent to each other, and a supernatant water outlet is provided at an upper portion of the high concentration overflow water storage tank, and the supernatant separated in the high concentration overflow water storage tank into the low concentration overflow water storage tank through the high concentration overflow water storage tank. It can be overpaid.

The side of the central separation channel is provided with a high concentration of overflow water inlet and a low concentration overflow water inlet, and the height of the minimum concentration of the low concentration overflow water inlet may correspond to the height of the top line of the high concentration overflow water inlet. In addition, in the high concentration overflow water storage tank and low concentration overflow water storage tank, a pump for transferring the overflow water to the discharge water system, the inclined bottom and solid pit and washing equipment for removing the sludge layer may be further provided.

A baffle is further provided at the upper ends of the high concentration overflow water storage tank and the low concentration overflow water storage tank, and the baffle serves to mitigate physical shock due to the drop of the overflow water. In addition, a pretreatment screen for separating the contaminants, coarse sculptures in the overflow water in the front end of the central separation channel may be further provided.

In the combined sewage pipe overflow water treatment method according to the present invention, when the overflow water level in the central separation channel is lower than the minimum line of the high concentration overflow water inlet, the overflow water is transferred to the sewage treatment apparatus connected to one side of the central separation channel, and the overflow water in the central separation channel When the water level corresponds to the high concentration overflow water inlet, the overflow water is stored in the high concentration overflow water storage tank through the high concentration overflow water inlet, and when the overflow water level in the central separation channel corresponds to the low concentration overflow water inlet, the overflow water flows into the low concentration overflow water inlet. The low concentration overflow water is stored in the storage tank, and when the water level in the central separation channel is higher than the highest line of the low concentration water flow inlet, characterized in that the overflow water is discharged to the discharge system.

When the monthly water is stored in the high concentration overflow water storage tank through the high concentration overflow water inlet, the high concentration overflow water inflow through the high concentration overflow water inlet is mixed with the flocculant in the flocculant mixing pipe so that the solid material in the high concentration overflow water is flocculated. In addition, the overflow water discharged downward through the flocculant mixing pipe is moved upward along the dividing wall provided in the high concentration overflow water storage tank, and is separated into solids and sludge by the inclined plate provided in the high concentration overflow water storage tank.

Combined sewage pipe overflow water treatment apparatus and method according to the present invention has the following effects.

First, it is possible to substantially minimize the pollutant load on the discharge stream by treating and storing or discharging high concentration of overflow water with high pollutant load, rather than simply storing the overflow water.

Second, it is possible to efficiently separate high concentrations of overflowed waters and low concentrations of overflowed waters without a special control system, and to reduce the cost of installing and maintaining the control system,

Third, it is possible to separate high quality overflow water and low concentration overflow water after treatment and separate by water quality.If necessary, low concentration overflow water can be discharged during rainfall, so that it can efficiently cope with various rainfall events and at the same time reduce the required storage tank capacity. Minimize the amount of storage required

Fourth, by temporarily storing the overflow water in the storage tank and discharging it, it can be used for flood reduction in areas where flooding is frequent.

Fifth, it is possible to reduce the additional pollutant load to the sewage treatment plant in Cheongcheon-si by treating the sludge sedimentation without transferring all the overflowed water stored in each storage tank to the sewage treatment plant at the end of rainfall.

Sixth, by using the flocculation system, which can be left idle in Cheongcheon, for the third treatment of the final effluent of the sewage treatment plant, it becomes possible to cope with the tightening environmental regulations such as reducing the river water pollution load and the total amount of water pollution.

1 is a block diagram of a combined sewage pipe system according to the prior art.
2 is a block diagram of a combined sewage pipe overflow water treatment apparatus according to an embodiment of the present invention.
Figure 3a is a plan view of a high concentration overflow water storage tank according to an embodiment of the present invention.
Figure 3b is a side view of a high concentration overflow water storage tank according to an embodiment of the present invention.
Figure 4a is a plan view of a supernatant water overflow mouth according to an embodiment of the present invention.
Figure 4b is a side view of the supernatant water overflow mouth according to an embodiment of the present invention.
5 is a reference diagram showing each level of the central separation channel.

Hereinafter, with reference to the drawings will be described in detail the combined sewage pipe overflow water treatment apparatus and method according to an embodiment of the present invention.

2, the combined sewage pipe overflow water treatment apparatus according to an embodiment of the present invention comprises a central separation channel 210, a high concentration overflow water storage tank 220 and a low concentration overflow water storage tank 230.

The central separation channel 210 basically connects the drainage pipe and the sewage treatment device so that the overflowed water flowing through the drainage pipe can be supplied to the sewage treatment device, and the overflowed water flowed through the drainage pipe according to the concentration. It serves to supply the high concentration overflow water storage tank 220 or low concentration overflow water storage tank 230.

The central separation channel 210 is configured in the form of a tube, and the side of the central separation channel 210 is provided with a high concentration overflow water inlet 211 and a low concentration overflow water inlet 212. The monthly water flow in the central separation channel 210 is supplied to the high concentration overflow water storage tank 220 and the low concentration overflow water storage tank 230 through the high concentration overflow water inlet 211 and the low concentration overflow water inlet 212, respectively. In this case, the high concentration overflow water inlet 211 and the low concentration overflow water inlet 212 may be configured in a rectangular shape, the lowest line of the low concentration overflow water inlet 212 is designed to correspond to the highest line of the high concentration overflow water inlet 211 It is preferable. In addition, a pretreatment screen may be further provided at the front end of the central separation channel 210, and the contaminants and coarse sculptures in the overflow water may be separated through the pretreatment screen.

Through such a configuration, when the water level of the overflow water flowing in the central separation channel 210 corresponds to the high concentration overflow water inlet 211, the overflow water is discharged to the high concentration overflow water inlet 211 to the high concentration overflow water storage tank 220. When the flow rate of the overflow water is increased so that the monthly water level of the central separation channel 210 corresponds to the low concentration overflow water inlet 212, the overflow water is discharged to the low concentration overflow water inlet 212 and supplied to the low concentration overflow water storage tank 230. do. At this time, the specific location of the high concentration overflow water inlet 211 and the low concentration overflow water inlet 212 should be designed in consideration of the capacity of the high concentration overflow water storage tank 220. That is, when the overflow water is filled in the high concentration overflow water storage tank 220, the positions of the high concentration overflow water inlet 211 and the low concentration overflow water inlet 212 should be set so that the overflow water flows into the low concentration overflow water storage tank 230. Meanwhile, the high concentration overflow water storage tank 220 is provided at the front end of the low concentration overflow water storage tank 230, and the reason for placing the location of the high concentration overflow water inlet 211 below the low concentration overflow water inlet 212 may be due to a high contaminant concentration of the initial overflow water. Because.

Next, the configuration of the high concentration overflow water storage tank 220 and the low concentration overflow water storage tank 230 will be described in detail.

The high concentration overflow water storage tank 220 serves to separate the high concentration overflow water flowing through the high concentration overflow water inlet 211, and the high concentration overflow water is separated into supernatant and sludge. In order to effectively perform such a solid-liquid separation, in the present invention, the configuration of the flocculant injection device 241, the flocculant mixing tube 242 and the inclined plate 222, as shown in Figures 2, 3a and 3b is presented, This induces floc formation and facilitates solid-liquid separation through floc sedimentation.

The flocculant injector 241 serves to supply flocculant to induce floc formation to the flocculant admixture tube 242, and the flocculant admixture tube 242 is mixed in the high concentration overflowed water and the flocculant and included in the high concentration overflowed water. As a function of changing the impurities into flocs, one end of the flocculant mixing pipe 242 is connected to the high concentration overflow water inlet 211, and the other end is connected to the high concentration overflow water storage tank 220.

Meanwhile, the dividing wall 221 is provided in the high concentration overflow water storage tank 220. The high concentration overflow water reservoir 220 may be divided into a first space and a second space on the basis of the dividing wall 221. The first space is provided with the coagulant admixture tube 242, and the second space is provided in the second space. The inclined plate 222 is provided.

The dividing wall 221 is provided to improve the precipitation efficiency of the solid material, that is, the floc contained in the overflow water supplied from the flocculant mixing pipe 242. Specifically, the high concentration overflow water containing the coagulant supplied from the coagulant mixing tube 242 is supplied downward, the solid-liquid separation is prevented because of the downward flow rate. Since the dividing wall 221 is provided, the downstream water flows downwardly and exceeds the dividing wall 221. In this process, the overflow water flow rate is reduced to prevent the solid-liquid separation by the flow rate and to increase the size of the floc. do. In addition, the solid-liquid separation is activated according to the structure in which the overflow water is supplied from the upper portion of the separation wall 221. In addition, the inclined plate 222 in the high concentration overflow water storage tank 220 induces a solid material such as floc to settle, and prevents the solid material from rising to finally separate the high concentration overflow water into the supernatant and sludge.

On the other hand, the upper side of the high concentration overflow water reservoir 220 is provided with a supernatant water outlet 223 (see Figs. 2, 4A and 4B), the supernatant in the high concentration overflow water storage tank 220 is the upper water outlet (223) Through the low concentration overflow water storage tank 230 through. In addition, the bottom of the high concentration overflow water storage tank 220 may be configured as an inclined surface, in this case, it is possible to facilitate the sludge collection by providing a solid pit in which solids are collected at one end of the inclined surface. Further, although not shown in the lower portion of the high concentration overflow water storage tank 220 may be further provided with a washing equipment and a pump. The washing equipment serves to remove the sludge accumulated at the bottom of the high concentration overflow water storage tank 220, the pump serves to discharge the supernatant water stored in the high concentration overflow water storage tank 220 to the discharge system after the rainfall.

The low concentration overflow water storage tank 230 receives low concentration overflow water flowing through the low concentration overflow water inlet 212 and the supernatant flowing through the supernatant overflow port 223 serves to separate the liquid through natural sedimentation. Like the high concentration overflow water storage tank 220, a slope, a solid pit and a pump may be provided at the lower portion of the low concentration overflow water storage tank 230, and the storage stored in the low concentration overflow water storage tank 230 after the rainfall is terminated through the pump. Water can be discharged to the discharge system. Meanwhile, a baffle (not shown) may be provided at an upper end of the high concentration overflow water storage tank 220 and the low concentration overflow water storage tank 230 to minimize physical impact caused by falling water.

In the above, the combined sewage pipe overflow water treatment apparatus according to an embodiment of the present invention. Hereinafter, the combined sewage pipe overflow water treatment apparatus using the same will be described.

First, when the rain is not described in the cheoncheon (晴天) state, the sewage collected through the chakcheol is transferred to the sewage treatment device through the central separation channel 210, the sewage is treated by the sewage treatment device. At this time, the rainfall does not flow, so that only the general sewage flows into the collecting pipe, the water level of the central separation channel 210 does not exceed the point A of FIG. In FIG. 5, point A is the lowest line of the high concentration overflow water inlet 211, point B is the highest line of the high concentration overflow water inlet 211 and the lowest line of the low concentration overflow water inlet 212, and point C is the low concentration overflow water inlet 212. ) Is the best line. Therefore, in the case of the cheoncheon state because the sewage is transferred to the water level lower than the A point in the central separation channel 210, the sewage of the Changcheon state is not transferred to the high concentration overflow water storage tank 220 is immediately transferred to the sewage treatment apparatus. At this time, the point A of the central separation channel 210 is preferably designed to correspond to the water level when the flow rate corresponding to three times (3Q) of the sewage treatment device design flow rate (1Q).

On the other hand, when the rainfall is started and the flow rate of the overflow water flowing through the drainage pipe is more than 3Q and the water level of the overflow water exceeds the point A of the central separation channel 210, the inflow of the overflow water into the high concentration overflow water inlet 211 starts. , The introduced high concentration overflow water is supplied to the flocculant mixing pipe 242 provided in the high concentration overflow water storage tank 220. At this time, as the coagulant is supplied to the coagulant mixing tube 242 from the coagulant injector 241, the high concentration overflow water and the coagulant are mixed in the coagulant mixing tube 242 to form a floc in the high concentration overflow water. do.

High concentration of overflow water containing the floc is discharged downward from the flocculant mixing pipe 242, the downstream overflow water is led upward along the dividing wall 221 and beyond the dividing wall 221, the size of the floc in the process It becomes large and solid-liquid separation is activated. In addition, the inclined plate 222 in the high concentration overflow water storage tank 220 to suppress the rise of the precipitated floc so that the solid-liquid separation proceeds effectively. By the passage of time, the water level of the high concentration overflow water storage tank 220 is increased, and the water level of the high concentration overflow water storage tank 220 is provided between the high concentration overflow water storage tank 220 and the low concentration overflow water storage tank 230. ), The supernatant is transferred to the low concentration overflow water storage tank 230 and stored.

On the other hand, if the rainfall persists, the water level of the central separation channel 210 gradually rises, and when the water level of the central separation repair exceeds the point B, the inflow of the overflow water into the low concentration overflow water inlet 212 starts, and the inflow of the overflow water is low. It is stored in the overflow water storage tank 230. In addition, the overflowed water stored in the low concentration overflowed water storage tank 230 is settled the solids over time. If the rainfall persists above a certain flow rate, the impurity concentration of the inflow water introduced through the drainage will be lowered as time passes. In the present invention, a high concentration of impurity is introduced over time under the assumption that inflow water above a certain flow rate is introduced. The influent contained is designed to be stored in a high concentration overflow water storage tank 220, and the influent containing a low concentration of impurities is stored in a low concentration overflow water storage tank (230).

As the continuous rainfall continues, when the water level of the low concentration overflow water reservoir 230 exceeds the point C of the central separation channel 210, the overflow water flowing through the conduit is discharged into the discharge system through a bypass channel (not shown). At this time, if the water quality of the monthly water flowing through the drainage pipe does not satisfy the water quality conditions that can be discharged directly to the discharge system, the storage capacity of the monthly water may be increased by discharging the clean storage water stored in the low concentration overflow water storage tank 230. .

When the rainfall is finished, the water level of the central separation channel 210 is returned to below the point A again, and the stored water stored in the low concentration overflow water storage tank 230 is discharged to the discharge system. At this time, when the overflowed water above the discharge standard is generated in the lower part of the storage tank due to precipitation of the solids, it may be transferred to the sewage treatment plant and discharged to the discharge water system after appropriate treatment. In addition, the supernatant stored in the high concentration overflow water storage tank 220 is discharged directly to the discharge system as it is, and the sludge deposited on the bottom can be transferred to the sewage treatment plant to be appropriately treated. Through this, it is possible to stably maintain the performance of the sewage treatment plant by minimizing the amount of overflow water transferred to the sewage treatment plant, thereby minimizing the pollutant load difference to the sewage treatment plant after the rainfall is over.

On the other hand, after the transfer of the stored water stored in the high concentration overflow water storage tank 220 and the low concentration overflow water storage tank 230 is completed, the sludge accumulated on the bottom surface using washing equipment such as a compressed air sprayer installed under each storage tank. Can be removed

210: central separation channel 211: high concentration overflow water inlet
212: low concentration overflow water inlet 220: high concentration overflow water storage tank
221: dividing wall 222: inclined plate
223: upper stream overflow port 230: low concentration overflow water reservoir
241: flocculant injection device 242: flocculant mixing tube

Claims (14)

A central separation channel for transferring the monthly water flowing into the collecting pipe;
A high concentration overflow water storage tank for storing the high concentration overflow water flowing from the central separation water;
A low concentration overflow water storage tank for storing the low concentration overflow water flowing from the central separation water; And
It is provided on one side of the high concentration overflow water storage tank is made to include a flocculant admixture tube to induce floc formation of the solid material contained in the high concentration overflow water and flocculant,
Separation wall is provided in the high concentration overflow water storage tank,
Combined sewage pipe overflow water treatment apparatus, characterized in that by the dividing wall, the overflow water discharged downward through the flocculant mixing pipe is changed in the upward direction.
delete 2. The combined sewage pipe overflow water treatment apparatus according to claim 1, wherein an inclined plate for promoting solid-liquid separation is provided in said high concentration overflow water storage tank.
The method of claim 1, wherein the high concentration overflow water storage tank and the low concentration overflow water storage tank is disposed adjacent to, the high concentration overflow water storage tank is provided on the upper portion,
The supernatant separated from the solid solution in the high concentration overflow water storage tank flows into the low concentration overflow water storage tank through the supernatant water outlet port.
According to claim 1, wherein the high concentration of the overflow water inlet and low concentration overflow water inlet located at different heights on the sides of the central separation channel,
Combined sewer pipe overflow water treatment device, characterized in that the height of the lowest line of the low concentration overflow water inlet corresponds to the height of the highest line of the high concentration overflow water inlet.
The combined sewage pipe of claim 1, further comprising a pump for transferring the overflow water to the discharge water system, an inclined bottom, a solid pit, and a washing device to remove the sludge layer in the high concentration overflow water storage tank and the low concentration overflow water storage tank. Overflow water treatment device.
The apparatus of claim 1, wherein a baffle is further provided at an upper end of each of the high concentration overflow water storage tank and the low concentration overflow water storage tank, and the baffle serves to mitigate a physical shock due to the drop of the overflow water.
The apparatus of claim 1, further comprising a pretreatment screen for separating contaminants and coarse sculptures in the overflowed water at the front end of the central separation channel.
In the combined sewage pipe overflow water treatment method using the combined sewage pipe overflow water treatment device of claim 1,
If the overflow water level in the central separation channel is lower than the lowest line of the high concentration overflow water inlet, the overflow water is transferred to the sewage treatment device connected to one side of the central separation channel,
If the overflow water level in the central separation channel corresponds to the high concentration overflow water inlet, the overflow water is stored in the high concentration overflow water storage tank through the high concentration overflow water inlet,
If the overflow water level in the central separation channel corresponds to the low concentration overflow water inlet, the overflow water is stored in the low concentration overflow water storage tank through the low concentration overflow water inlet,
When the level of the overflow water in the central separation channel is higher than the highest line of the low concentration overflow water inlet, characterized in that the overflow water is discharged to the discharge system,
When the monthly water is stored in the high concentration overflow water storage tank through the high concentration overflow water inlet,
Combined sewage pipe overflow water treatment method characterized in that the high concentration overflow water flowing through the high concentration overflow water inlet is mixed with the flocculant in the flocculant mixing pipe is solidified in the high concentration overflow water.
delete The method of claim 9,
Combined sewage pipe overflow water treatment is characterized in that the overflow water discharged downward through the flocculant mixing pipe is moved upward along the separation wall provided in the high concentration overflow water storage tank, and is separated into the supernatant and sludge by the inclined plate provided in the high concentration overflow water storage tank. Way.
The method of claim 11, wherein the supernatant water in the high concentration overflow water storage tank flows into the low concentration overflow water storage tank through a supernatant water outlet provided in the high concentration overflow water storage tank.
10. The method of claim 9, wherein a height of the lowest line of the high concentration overflow water inlet corresponds to a water level when the maximum allowable flow rate of the sewage treatment device passes.
10. The method of claim 9, wherein the supernatant separated by the high concentration overflow water storage tank and the low concentration overflow water storage tank is transferred to a discharge system.

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