KR20110006326U - Filtration apparatus for overflow of sewer - Google Patents

Abstract

The present invention is a high-speed system for treating sewage and / or discharged sewage that is not properly treated after the first sedimentation of confluent sewage that flows several times more than the capacity of the sewage treatment plant in rainy season. The present invention relates to a filtration treatment apparatus, and provides a treatment apparatus for treating various pollutants contained in confluent sewage generated in large quantities due to unexpected rainfall at high speed.
In order to achieve the above object, the treatment device according to the present invention and the inlet portion for guiding the overflow sewage exceeding the facility capacity of the sewage terminal treatment device; A floc forming tank configured to form flocs by introducing the sewage into the flocculant and the stirrer; An upflow filtration tank for filtering sewage containing floc by contacting with a porous flotation filter; A discharge part which discharges the treated water processed by this filtration tank to an external water system; A concentration tank for collecting and separating contaminants filtered out from the filtration tank; And backwashing means for backwashing the porous floating media.

Description

High-speed filtration system for sewage overflow stream {Filtration apparatus for overflow of sewer}

The present invention is a device that can treat the overflow and outflow of the sewage flowing out of the confluent sewage flowing from the sewage treatment plant in rainy weather in the combined sewage system. Especially, floc is formed by using flocculant to improve the filtering capacity. The present invention relates to a treatment apparatus capable of removing contaminants such as organic substances and phosphorus by filtering contaminants using porous flotation media.

The conventional treatment of combined sewage used in the sewage treatment system, where the combined sewage flowing into the sewage terminal treatment plant from the sewage sewage system, is overwhelmed to the public water without overflowing the sewage capacity of the sewage terminal treatment plant. The reality is that they are stocked.

As such, after the first simple precipitation, sewage that flows over and discharged in the sewage is discharged to public waters without contaminants being removed. It is causing.

In the meantime, the domestic sewage treatment plant has been installed and operated with advanced treatment facilities by strengthening the discharged water quality standard several times, and the sewage is properly treated and discharged in Cheongcheon. Since it is overflowed and discharged in the unconventional state, it has adversely affected the water pollution and ecosystem of the downstream public waters due to the overflowed sewage, and it is urgently required to develop an appropriate treatment technology to solve this problem.

Therefore, the present invention was created to solve the above-mentioned problems.

The object of the present invention is to provide a high-speed filtration system that can effectively remove contaminants that are incompletely treated and discharged after the first simple sedimentation of confluent sewage flowing into the sewage treatment plant in rainy weather from the combined sewage system by chemical coagulation and filtration. It is designed in such a way that the sewage is passed through an upflow filtration tank equipped with a porous flotation filter in order to improve the filtering capability.

The present invention aims to increase the filtration effect of pollutants by forming flocs by chemical flocculation.

The present invention is designed to treat contaminants in such a way that the flocculated floc passes through a filtration tank composed of porous flotation media, which dramatically improves the filtration capacity.

Porous floating media used in the present invention are artificial gravel, light in weight and high in porosity, so they can float in water, and are designed to treat contaminants by increasing the filtration capacity per unit area.

In order to overcome the problem of excessive collection of contaminants in the porous flotation media over time, the effect of filtration treatment is lowered. It is designed to have a separate device to separate the.

The present invention is a device for filtering the overflow water exceeding the facility capacity of the sewage terminal treatment plant, the apparatus comprising: a floc forming tank having an inlet for guiding the overflow water and at least one mixed paper and a chemical supply unit for administering a flocculant to the mixed paper; An opening in the bottom surface connected to the first guide tube and in fluid communication with the floc forming tank, the second screen disposed on the opening, and spaced apart in parallel on the second screen. A filtration tank having a first screen, a plurality of porous floating media accommodated between the first screen and the second screen, and a discharge portion for guiding the treated water to an external water system; And a backwashing facility for supplying air for washing the porous flotation filter of the filtration tank. In the high-speed filtration apparatus for sewage overflow water, the porous flotation filter is formed on the glass powder having a small particle size as porous artificial gravel. The mixture mixed with the blowing agent is heated to high temperature and cooled to form a granular body which is pulverized. The granular body has a particle size of 10 to 50 mm, a volume density of 0.2 to 0.6 g / cm 3 when dried and a volume density of 1 g / to saturate water. And a condensation tank smaller than 3 cm 3, having a porosity of 65 to 80%, in fluid communication with the opening of the filtration tank and the second guide tube, and collecting sediment, scum and the like separated during backwashing.

In addition, it is designed to provide a separate device to supply the backwash air flowing in the upstream from the filter tank to separate the trapped material attached to the porous media.

According to the description of the present invention, the present invention is to provide a treatment apparatus for treating a variety of contaminants contained in the confluent sewage generated in large quantities by unexpected rainfall at high speed.

In addition, the treatment apparatus according to the present invention is to form a floc contaminant of the overflow water through the flocculant to improve the filtration treatment capacity.

The present invention uses a porous flotation filter for the filtration treatment. If the pollutant is excessively trapped in the porous flotation filter and the filtration resistance is increased, the separate backwash air provided in the present invention is supplied to the porous flotation filter and attached to the porous flotation filter. The sediments that were present can be easily separated.

1 is a schematic diagram of a high-speed filtration system for sewage overflow water according to the present invention.
Figure 2 is a schematic diagram showing an operation process according to the use example of the filter paper provided in the high-speed filtration apparatus of the present invention, Figure 2a shows the filter paper is filtering, Figure 2b shows the filter paper being washed, 2c shows the sludge discharged filter paper.

Now, the high speed filtration apparatus for sewage overflow water according to the present invention will be described in more detail with reference to the accompanying drawings.

1 is a schematic diagram of a high-speed filtration system for sewage overflow water according to the present invention.

As shown, the high speed filtration system 1 for sewage overflow water according to the present invention is composed of a floc forming tank 10, a filtration tank 20, and a concentration tank 30. This sewage overflow high-speed filtration system (1) is capable of treating sewage discharged into the public water without unexpected treatment such that the amount of contaminated sewage exceeds the capacity of the sewage terminal treatment plant unexpectedly, as in rainy weather. have.

To this end, the present invention is a floc forming tank 10 of the high-speed filtration system for sewage overflow water (1) according to the present invention through the inlet 110, the monthly water exceeding the facility capacity of the sewage terminal treatment plant (not shown) Guided by).

The floc forming tank 10 provides a space for sufficiently stirring the overflowed water guided to the inlet 110 and the flocculant, and the floc forming tank 10 is capable of forming a floc, which is a suspended particle. One or more mixed papers 120 are provided to secure a sufficient residence time of the mixture. Preferably, the mixed paper 120 of the floc forming tank 10 includes a drug supply unit 121 for administering a flocculant to the overflowed water, and an agitator 122 for mixing and stirring the flocculant and the overflowed water.

By agitation, the floc is formed in the floc forming tank 10 and goes to the filtration tank 20 along the first guide tube 11 extending from the final blended paper 120 of the floc forming tank 10 for the next process. You are guided. The first guide pipe 11 is provided with a first valve 12 that can control the flow flow of the flocks and the overflow water to be guided from the floc forming tank 10 to the filtration tank 20.

The filtration tank 20 is designed to be discharged by receiving the overflowed water downstream from the downstream for the contact space with the porous flocculant, and is discharged, and is communicated with the first guide pipe 11 at the opening 210 at the bottom thereof. In the vicinity of the upper surface, the discharge portion 220 for discharging the filtered treated water to an external water system and the first screen 230 arranged across the filtration tank 20 under the discharge portion 220 and the filtration tank 10 on the bottom surface. It is designed in an upward flow with a second screen 240 arranged across. In addition, the filtration tank 20 is provided with a porous flotation medium 40 between the first screen 230 and the second screen 240.

* The filtration tank 20 is preferably provided with a backwashing equipment to be used for backwashing the porous flotation filter 40, the backwashing equipment is a backwashing blower 251 and the filtration tank 20 in the blower 251 The pipe 252 extends to the inside and one or more diffusers 253 branched from the pipe 252. The pipe 252 is preferably disposed on the second screen 240.

In addition, the pipe 252 is provided with a valve 254, which is open when backwashed to guide the air flow generated in the blower 251 to the filtration tank 20. In the process other than backwashing, for example, during filtration, the valve 254 is closed to prevent the overflow water or the treated water contained in the filtration tank 20 from flowing into the pipe 252.

The porous flotation filter 40 is a porous artificial gravel made of a floatable material, and has a granular body obtained by heating a mixture of a blowing agent in a glass powder having small particles to a high temperature and pulverizing it by cooling. It is -50mm, the volume density at the time of drying is 0.2-0.6g / cm <3>, and the porosity is 65-80%. The volume density at the time of water saturation of the porous flotation medium 40 is floated in water is less than 1g / cm 3.

As described above, the first screen 230 and the second screen 240 are disposed at close intervals to prevent the porous flocculant 40 from exiting through the opening 210 and / or the discharge part 220.

The flocks and the overflowed water to be guided to the first guide pipe 11 are introduced into the filtration tank 20 through the opening 210. The flocks and the overflowed water introduced into the filtration tank 20 are filtered by being in contact with the porous flocculent 40 while being flowed upward, and the treated water is passed through the first screen 230 along the outlet 220 along the external water system. Are exported to.

When the filtration efficiency of the porous flotation filter 40 is lowered, the air is injected into the filtration tank 20 through the diffuser 253 to backwash the porous flotation filter 40. In the backwashing process, the sediments attached to the porous flocculant 40 are discharged under the second screen 240 and guided to the concentration tank 30 along the second guide tube 21. Optionally, one end of the first guide tube 11, one end of the second guide tube 21, and the opening 210 may be integrally formed as shown and may be installed to communicate with each other.

The concentration tank 30 collects the scum contained in the sediment separated from the porous flocculant 40 and the overflowed water.

The thickening tank 30 separates and stores the sediment and / or floc forming tank 10 separated from the porous flocculant 40 and the scum accumulated in the sludge and the overflowed water in the filtration tank 20 and guided to a separate treatment facility. can do. Optionally, an electric valve may be provided in the second guide tube to assist the transfer of the viscous sludge and scum.

Thickener 30 is not specifically described herein as a well known technique for those skilled in the art.

For reference, the solid arrow shown in FIG. 1 illustrates a path to be filtered while moving to the floc forming tank 10 and the filtration tank 20 along the process of processing the overflowed water to be introduced into the inlet 110.

Figure 2 is a schematic diagram showing an operation process according to the use example of the filtration tank provided in the high-speed filtration apparatus of the present invention. Here, after passing through the floc forming tank, when the sewage overflow water treatment apparatus according to the present invention to treat the contaminants contained in the floc and the overflow water, when backwashing the porous floating media and after sediment and pollutants When the discharge flows into the guide pipe to identify the flow of the flow guided through the guide pipes (11, 21) for better understanding, the pipe is colored in black. Do not paint pipes without flow. The overflow water inside the filtration tank 20 is not separately colored to clarify the understanding of the filling state of the guide tube.

2A is a diagram illustrating a step of filtering overflow water and flocs in the filtration tank 20.

Specifically, the floc and the overflow water are guided to the opening 210 of the filtration tank 20 along the first guide pipe 11. The first guide pipe 11 is configured to guide the flow of the overflowed water and the contaminants contained in the overflowed water in the form of suspended particles from the floc formation tank 10 (see FIG. 1) to the filtration tank 20. 12) open. The overflow water and the floc flows into the filtration tank 20 along the opening 210 of the filtration tank 20 (see FIG. 1). Since the overflow water and the floc are continuously supplied, they pass through the second screen 240 (see FIG. 1). It flows upward through the first screen 230 (see FIG. 1) and is discharged to the discharge part 220. In other words, the filtration tank 20 used in the present invention is an upflow filtration tank, and the overflow water flowing into the opening located at the lower side is filtered by the porous flotation media 40 accommodated between the first and second screens to be discharged to the outside. Can be.

In this flow process, the overflow water is filtered while contacting a plurality of porous flotation media 40 arranged in the filtration tank 20, more specifically, below the first screen 230. The filtered monthly water, that is, the treated water, is discharged to the external water system through the discharge unit 220.

The second guide tube 21 communicating with each other from the opening of the filtration tank 20 to the concentration tank 30 must be closed so that the monthly water to be guided to the first guide tube 11 is supplied only to the filtration tank 20 to be filtered. do. In addition, the pipe 252 of the backwashing equipment extends to the inside of the filtration tank 20, and the valve 254 must be shut off so that the overflow water does not flow along the pipe 252 to the backwashing blower 251. By closing the valves 22 and 254 in this way, while the overflow water is continuously supplied into the filtration tank 20, various contaminants contained in the overflow water can be filtered at a high speed by using a porous flotation medium.

2B is a view illustrating a cleaning step of the porous flotation media 40 arranged inside the filtration tank 20.

If contaminants are excessively trapped on the surface of the porous flocculent filter and the filtration resistance becomes large, and the filtration efficiency is reduced, the following washing step is performed. To shut off the supply, the first valve 12 of the first guide pipe 11 is shut off, and the second valve 22 of the second guide pipe 21 to maintain a certain level of water in the filtration tank 20. To block. In other words, by blocking the first valve 12 and the second valve 22, the filtration tank 20 is filled with overflow water by a predetermined level. The predetermined water level is the height of the water that is placed below the outlet 220 and no longer exits through the outlet 220.

As the backwash blower 251 starts, the valve 254 is opened, and the high pressure air supplied to the blower 251 is guided into the filtration tank 20 along the pipe 252. In particular, this air is supplied to the entire filtration tank 20 by means of the diffuser 253.

One or more diffusers 253 arranged above the second screen provide a large amount of air towards the porous flotation media 40. This air causes the turbulent flow filled in the filtration tank 20 to disturb or turbulent flow, while the porous flotation media 40 collide with each other and mix with each other. Can be separated.

2C is a view illustrating a discharge step of the sludge accumulated in the lower part of the filtration tank 20.

After the sediment is sufficiently separated from the porous flocculant 40, the operation of the backwash blower 251 is stopped, so that the valve 254 is closed. Then, the first valve 12 of the first guide tube 11 is closed and the second valve 22 of the second guide tube 21 is opened. Sediments accumulated at the bottom of the filtration tank 20 and scums swept into the sediment or overflow water separated from the porous flotation media 40 are collected in the concentration tank 30 (see FIG. 1) along the open second guide tube 21.

It is intended that the invention not be limited to the description but that modifications and variations are possible within the scope of the following claims.

Description of the Related Art
1 ----- high speed filtration system,
10 ----- floc forming tank,
20 ----- filtration tank,
30 ----- Thickener.

Claims (5)

In the apparatus for filtering the overflow water exceeding the facility capacity of the sewage terminal treatment plant,
A floc forming tank (10) having an inlet (110) for guiding the overflow water and at least one mixed paper (120) and a medicine supply unit (121) for administering a flocculant to the mixed paper (120);
An opening 210 positioned on the bottom surface in fluid communication with the floc forming tank 10 and the first guide tube 11 and connected to the first guide tube 11, and disposed on the opening 210. The second screen 240, the first screen 230 spaced apart in parallel on the second screen 240, and a plurality of pores accommodated between the first screen 230 and the second screen 240. A filtration tank 20 having a flotation medium 40 and a discharge part 220 for guiding the treated water to an external water system; In the high-speed filtration of sewage overflow water comprising a; and a backwashing equipment for supplying air for washing the porous flotation filter 40 of the filtration tank 20,
The porous flocculant 40 is a porous artificial gravel, which is a granulated body obtained by pulverizing a mixture of a blowing agent mixed with a blowing agent in a glass powder having a small particle size at a high temperature and cooling it. Volume density at drying is 0.2 to 0.6 g / cm 3, volume density at water saturation is less than 1 g / cm 3 and porosity is 65 to 80%,
High-speed sewage overflow water, characterized in that it comprises a; condensation tank 30 for collecting sediment and scum, etc. separated during backwashing in fluid communication with the opening 210 of the filtration tank 20 and the second guide tube 21 Filtration treatment device. 2. The high speed filtration apparatus for sewage overflowed water according to claim 1, wherein the floc forming tank (10) further comprises an agitator (122).
According to claim 1, wherein the backwashing equipment is a blower 251, a pipe 252 extending from the backwashing blower 251 to the inside of the filtration tank 20, one or more installed at the distal end of the pipe 252 A high speed filtration apparatus for sewage overflowed water, comprising an diffuser 253 and a valve 254 that opens and closes the pipe 252.
According to claim 1, wherein the first guide pipe 11 is provided with a first valve 12, the second guide pipe 21 has a second valve 22, characterized in that High speed filtration system. According to claim 3, The pipe 252 is a high speed filtration system for sewage overflow water, characterized in that disposed on the second screen (240).

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