KR101044978B1 - Purification system for combined sewer overflows - Google Patents

Abstract

The present invention relates to a system for purifying sewage water overflowed during rainy weather in a combined sewage system, comprising: a pretreatment unit 100 for removing contaminants by a screen from the sewage water; Coagulant administration unit 200 for administering a coagulant to the effluent from the pre-treatment unit 100; A first cyclone separator 310 for separating sludge from the wastewater to which the flocculant is administered and discharging the purified water; By presenting a water purifying apparatus including a sludge storage tank 400 for storing the separated sludge, while the spatial and cost constraints for construction, it is possible to efficiently purify the overflow water by physical and chemical treatment.

CSO, cyclone, flocculant

Description

Water Purifier {PURIFICATION SYSTEM FOR COMBINED SEWER OVERFLOWS}

TECHNICAL FIELD The present invention relates to the field of environment, and more particularly, to a water purification system of effluent.

Combined sewer overflows (CSOs), which combine rainwater, sewage, and sediment in the rainfall, occur during rainfall.

CSO refers to the monthly flow of some sewage discharged from rainwater from the stormwater or pumping station during rainy weather in the combined sewage system.The amount or quality of CSO can greatly affect the water quality, ecosystem and water use depending on the discharge water area. Improvement measures for CSOs in the United States are an urgent and important task.

In the combined sewage system, pollutants settle at the bottom of the slow-flowing conduit because the Cheoncheon city has significantly less flow of sewage and some infiltration water than the planned stormwater.

This pollutant is discharged at higher concentrations than sewage during rainfall and tends to be lower as the dilution rate increases.

The Enforcement Regulations (Section 25) of the sewage pipe maintenance area in the revised draft of the Sewerage Act Enforcement Decree (2007.1. Ministry of Environment) regulates the BOD of overcurrents to be less than 40 mg / L. In addition, it applies to the water quality regulations for overflow water (2Q), which is bypassed after the first sedimentation in the sewage treatment plant, among the sewage (3Q) sewage treatment targets.

In order to meet the discharged water quality standards of the overflowed water, the physical and chemical treatment of the overflowed water is most important. Is capable of physically treating only SS (floating material), and no chemical treatment is performed at all.

In addition, storage type treatment facilities (dual purpose reservoirs (use of reservoirs), artificial wetlands, underground storage, small reservoirs of origin), infiltration type treatment facilities (infiltration ponds, infiltration trenches, penetration ditches, infiltration collection wells, permeable packaging), vegetation Type treatment facilities (vegetable filtration, vegetation canals), etc. are being used, but there is a problem that the space and cost constraints are too long to construct them in the existing sewage treatment plant, and the treatment time of the overflow water is too long.

The present invention has been made to solve the above problems, and an object thereof is to provide a water purification device capable of efficient purification by physical and chemical treatment of overflow water while having less space and cost constraints for construction.

The present invention provides a system for purifying effluent water overflowed during rainy weather in the combined sewage system, in order to achieve the object as described above, the pre-treatment unit 100 for removing contaminants by the screen from the effluent water; Coagulant administration unit 200 for administering a coagulant to the effluent from the pre-treatment unit 100; A first cyclone separator 310 for separating sludge from the wastewater to which the flocculant is administered and discharging the purified water; It presents a water purifying apparatus comprising a; sludge storage tank 400 for storing the separated sludge.

It is preferable that the sludge storage tank 400 further comprises a flocculation aid supply unit 500 which separates the concentrated sludge and supplies it to the first cyclone separator 310 as a coagulation aid.

It is preferable to further include a second cyclone separation unit 320 for separating the sludge from the wastewater to which the flocculant is administered, and discharging the purified water to supply the first cyclone separation unit 310.

The height / inner diameter of the first cyclone separator 310 is greater than the height / inner diameter of the second cyclone separator 320.

It is preferable that the number of the first cyclone separators 310 is greater than the number of the second cyclone separators 320.

The plurality of first cyclone separators 310 may be disposed around the outer circumference of the second cyclone separator 320.

Further comprising a flocculant dose control unit 700 for controlling the dose of the flocculant administration unit 200, the flocculant dose control unit 700 is suspended in the purified water discharged from the second cyclone separator 320 It is preferable to control the flocculant administration unit 200 by measuring the particles.

It is preferable to further include a post-treatment unit 600 for purifying the purified water discharged from the first cyclone separator 310 again by a filter.

Further comprising a flocculant dose control unit 700 for controlling the dose of the flocculant administration unit 200, the flocculant dose control unit 700 measures the suspended particles of the purified water discharged from the after-treatment unit 600 It is preferable to control the flocculant administration unit 200.

The present invention provides a water purifier capable of efficient purification by physical and chemical treatment of overflow water while having less space and cost constraints for construction.

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

As shown in Figure 1, the present invention is a system for purifying sewage water flowing over the rain in the combined sewer, pre-treatment unit 100 for removing contaminants by the screen from the sewage water; Coagulant administration unit 200 for administering a coagulant to the effluent from the pre-treatment unit 100; A first cyclone separator 310 for separating sludge from the wastewater to which the flocculant is administered and discharging the purified water; It is configured to include; sludge storage tank 400 for storing the separated sludge.

6 is a perspective view showing the configuration of the cyclone separator 310, the dotted line arrow shows the flow of dirty water, the solid arrow shows the flow of particulate contaminants such as sand, gravel.

As shown, the cyclone separator 310 has a conical body portion 311 formed so as to form a flow space of dirty water therein, and gradually decrease as the area of the longitudinal section is directed downward; It is formed on the side of the conical body portion 311, and the waste water inlet 312 formed to have an eccentric flow of the introduced waste water; A separator purification water outlet (313: vortex finder) formed above the conical body portion 311; A sludge outlet 314 formed below the conical body portion 311 and formed to discharge sludge into the sludge storage tank 400; .

Since the contaminated water inlet 312 is formed to have an eccentric flow of rainwater, the contaminated body portion 311 is inside the conical body part 311 by centrifugal force when the contaminated water including particulate contaminants enters the contaminated water inlet 312 with a predetermined water pressure. It flows while forming a vortex.

At this time, the granular contaminants such as sand, gravel and sludge gradually descend to settle in the sludge storage tank 400 through the sludge outlet 314 (solid arrow), and the purified water separated from the granular contaminants gradually rises to the purified water outlet 313 Out).

The present invention uses the principle of such a cyclone separation device, the coagulant is administered to the effluent from the pretreatment unit 100, and the sludge is separated from the effluent to which the coagulant is administered by the cyclone separation unit 310, In this case, the purified water is discharged.

That is, the effluent water to which the coagulant is administered forms a vortex in the cyclone separator 310, and thus, the coagulant and the contaminant are naturally mixed, and the coagulated sludge is discharged through the sludge outlet 314.

Since the configuration of such a system does not need to be administered a lot of space and cost, it is possible to obtain the effect of efficient purification by the physical and chemical treatment of the overflow water in a short time, while reducing the space and cost constraints.

In the sludge storage tank 400, a concentrated sludge (MLSS: Mixed Liquor Suspended Solid) can be obtained, which includes microorganisms in the aeration tank as a mixed liquid floating material in the aeration tank.

As shown in FIG. 2, when this is supplied to the first cyclone separator 310 as a coagulant, the effect of increasing sedimentation of the solid material to increase the separation efficiency of the cyclone is added.

Such concentrated sludge can be easily obtained in existing sewage treatment plants, thereby enabling efficient wastewater treatment while saving cost.

As shown in FIG. 3, the purified water discharged from the cyclone separator 310 may be discharged after being purified again by the filter of the aftertreatment unit 600.

In order to further increase the separation efficiency of the cyclone, the composition further comprises a second cyclone separation unit 320 for separating the sludge from the sewage water to which the flocculant is administered and discharging the purified water and supplying it to the first cyclone separation unit 310. It is preferable to take (FIG. 4).

The second cyclone separation unit 320 stirs the flocculant and the foul water first, and then supplies the stirred mixture to the first cyclone separation unit 310, thereby improving the treatment efficiency of the first cyclone separation unit 310. This is because it can increase and prevent an overload on the post-processing unit 600.

Furthermore, it is preferable that the height / inner diameter of the first cyclone separator 310 is greater than the height / inner diameter of the second cyclone separator 320 (FIG. 7).

In the second cyclone separation unit 320, mixing of the flocculant and the waste water is performed, and the formed floc is transmitted to the first cyclone separation unit 310 in an unbreakable state. This is because it is advantageous to allow the internal flow rate to be formed slowly.

Since the first cyclone separator 310 serves to separate the liquid and the solids already formed, it is advantageous to make the internal flow rate faster by making the inner diameter smaller than the height.

In order to increase the separation efficiency within the same time, it is preferable to install so that the number of the first cyclone separator 310 is larger than the number of the second cyclone separator 320, and the plurality of first cyclone separator 310 ) Is installed around the outer circumference of the second cyclone separation unit 320, an advantage of minimizing the space required for installation is added (FIG. 8).

The coagulant dose of the coagulant administration unit 200 may be uniformly determined, but the suspended particles contained in the pollutant and the purified water are measured, and the coagulant dose control unit 700 determines the most efficient dose from the measured value. It is preferable to control (FIG. 5).

The flocculant dose control unit may be implemented by a streaming current detector (SCD), which is composed of a current sensor and a current signal amplification device for detecting surface charge of particles, and measures the amount of charge on the surface of the suspended particles. The amount is sensed and the coagulant administering unit 200 is controlled to administer the most appropriate amount of coagulant therefrom.

The flocculant dose control unit 700 measures the suspended particles of the purified water discharged from the after-treatment unit 600, it is preferable to control the flocculant administration unit 200 based on this, and further, the second cyclone separation unit 320 It is more preferable to refer also to the measured value measured by the suspended particles of the purified water discharged from the.

The sludge of the sludge storage tank 400 may be directly treated by a process such as dehydration and cake removal, or may be treated by being connected to an existing sewage treatment plant.

Since the above has just been described with respect to some of the preferred embodiments that can be implemented by the present invention, as is well known the scope of the present invention should not be construed as limited to the above embodiments, the present invention described above All of the technical ideas together with the technical idea of the base will be included in the scope of the present invention.

Figure 1 below shows an embodiment of the present invention,

1 is a configuration diagram of a first embodiment.

2 is a configuration diagram of a second embodiment.

3 is a configuration diagram of a third embodiment.

4 is a configuration diagram of a fourth embodiment.

5 is a configuration diagram of a fifth embodiment.

6 is a perspective view of a cyclone separator;

7 is a side view of the first cyclone separator and the second cyclone separator;

8 is a plan view of a first cyclone separator and a second cyclone separator;

DESCRIPTION OF REFERENCE NUMERALS

100: pretreatment unit 200: flocculant administration unit

310: first cyclone separator 320: second cyclone separator

400: sludge storage tank 500: flocculation aid supply unit

600: after-treatment unit 700: flocculant dose control unit

Claims (9)

As a system for purifying sewage water overflowed during rainy weather in a combined sewerage system, A pretreatment unit 100 for removing the contaminants by the screen from the waste water; Coagulant administration unit 200 for administering a coagulant to the effluent from the pre-treatment unit 100; A first cyclone separator 310 for separating sludge from the wastewater to which the flocculant is administered and discharging the purified water; A sludge storage tank 400 for storing the separated sludge; And a second cyclone separator 320 separating the sludge from the effluent water to which the flocculant is administered and discharging the purified water to supply the first cyclone separator 310. The height / inner diameter of the first cyclone separator 310 is greater than the height / inner diameter of the second cyclone separator 320. The method of claim 1, And a flocculating aid supplying part (500) for separating the concentrated sludge from the sludge storage tank (400) and supplying the concentrated sludge to the first cyclone separating part (310). delete delete The method of claim 1, Water purifier, characterized in that the number of the first cyclone separation unit 310 is installed to be larger than the number of the second cyclone separation unit (320). The method of claim 1, The plurality of first cyclone separators 310 are installed around the outer circumference of the second cyclone separator 320. The method according to any one of claims 1, 2, 5 and 6, Further comprising a flocculant dosage control unit 700 for controlling the dose of the flocculant administration unit 200, The flocculant dosage control unit 700 controls the flocculant administration unit 200 by measuring the suspended particles of the purified water discharged from the second cyclone separator 320. The method of claim 1, Water purification device further comprises a after-treatment unit 600 for purifying the purified water discharged from the first cyclone separation unit 310 by a filter again. The method of claim 8, Further comprising a flocculant dosage control unit 700 for controlling the dose of the flocculant administration unit 200, The flocculant dose control unit 700 controls the flocculant injector 200 by measuring the suspended particles of the purified water discharged from the aftertreatment unit 600.

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