KR102253591B1 - Non-point pollution reducing system having inproved backwash performance - Google Patents

Abstract

A non-point pollution reduction facility with remarkably improved backwashing performance is disclosed. According to the present invention, the non-point pollution reduction facility comprises: a pretreatment tank in which a space part into which the influent is introduced is formed; a filtration tank separated from the pretreatment tank by a first partition wall, communicated with the pretreatment tank through a sluice gate formed under the partition wall, provided with a first filter medium layer on the top of the sluice gate, having an airlift pipe for backwashing connected to an upper portion of the first filter medium layer to discharge contaminated backwash water to the pretreatment tank, and having an aeration pipe to generate air bubbles in a lower portion of the first filter medium layer; and a treatment tank separated from the filtration tank by a second partition wall, discharging the filtered treated water, and supplying the backwash water to the filtration tank.

Description

Non-point pollution reduction facility with improved backwash performance {NON-POINT POLLUTION REDUCING SYSTEM HAVING INPROVED BACKWASH PERFORMANCE}

The present invention relates to a non-point pollution reduction facility, and more particularly, to a non-point pollution reduction facility with improved backwashing performance.

Water pollution sources are classified into Point Pollution Source and Non-Point Pollution Source for convenience of prevention and management. Point pollutant sources are pollutants from which wastewater containing pollutants is discharged from sewage pipes or waterways in specific areas such as sewage plants, wastewater treatment plants, power plants, abandoned mines, oil tanks, and oil wells. Non-point pollutants have an unclear discharge area and remain on a wide range of surface surfaces, and in case of rain, they flow into rivers and groundwater along with rainwater, causing water pollution.

From the past to the present, management and support at the central government level related to pollutant treatment has been focused on workplaces with clear sources of pollution, sewage treatment facilities, wastewater treatment facilities, livestock wastewater treatment facilities, and excreta treatment facilities. However, with the recent implementation of comprehensive water management measures and total water pollution management system, it is difficult to identify the exact route of outflow, and management of non-point pollutants generated from roads and parking lots where the inflow of pollutants is non-continuous. It is strengthening.

Korean Patent No. 0538124 discloses a non-point pollutant treatment apparatus for efficiently treating non-point pollutants flowing into a river. Such a non-point pollution treatment apparatus includes a filter layer for filtering rainwater, and a backwashing process is required to wash the filter layer after filtering.

Korean Patent Registration No. 0538124 discloses a water treatment system that purifies water quality by using a carrier manufactured using polyethylene and waste tires to efficiently treat non-point pollutants flowing into the river in treating non-point pollutants. have. However, since the treated water that has passed through the filtration tank cannot be recycled as backwash water, and it is impossible to observe the blockage state of the filter layer and the state of adsorption of pollutants, there is a problem in that maintenance is not smooth.

The applicant of the present invention has disclosed a non-point pollution reduction facility capable of automatic backwashing using a floating body in Korean Patent Registration No. 1242378, but the effect of washing the filter layer is effective only through the downward flow (from the top to the bottom of the filter layer) using backwash water. There was an insufficient problem, and since then, the applicant disclosed a non-point pollution reduction facility equipped with a buoyant valve that discharges pollutants into the water collecting tank when air backwashing in Korean Patent No. 1846421, but it is filtered through air backwash. There is a problem in that foreign matter separated from the layer is not completely discharged through the buoyancy valve, and the bottom edge of the filter tank is a blind spot during backwashing, and accumulated sludge is not removed at all.

An object of the present invention is to provide a facility for reducing non-point pollution with remarkably improved backwashing performance.

In order to solve the above problems, the present invention includes a pretreatment tank in which a space through which inflow water is introduced is formed; Separated into the pretreatment tank and the first partition wall, communicates with the pretreatment tank by a sluice gate formed under the partition wall, a first filter material layer is installed above the sluice door, and an air lift pipe for backwashing above the first filter material layer A filtration tank having an air diffuser configured to be connected to discharge contaminated backwash water to the pretreatment tank and to generate air bubbles below the first filter material layer; And a treatment tank separated by the filtration tank and the second partition wall and discharging the filtered treated water and supplying backwash water to the filtration tank.

In addition, the present invention, the pretreatment tank in which the space portion is formed in which the influent water is introduced; It is separated into the pretreatment tank and the first partition wall, communicates with the pretreatment tank by a sluice gate formed under the partition wall, a first filter material layer and a second filter material layer are installed above the sluice door, and the first filter material layer and the second filter material layer A filter tank having an airlift pipe for backwashing between the filter media layers and an upper portion of the second filter media layer to discharge contaminated backwash water by the pretreatment tank and to generate air bubbles below the first filter media layer; And a treatment tank separated by the filtration tank and the second partition wall and discharging the filtered treated water and supplying backwash water to the filtration tank.

In addition, the filtration tank provides a non-point pollution reduction facility, characterized in that the bottom is inclined from the second partition to the first partition, and the lower end of the second partition has a round shape.

In addition, the backwash water supplied to the filtration tank is supplied through a first backwash water supply pipe supplied to the second filter media layer and a second backwash water supply pipe supplied toward the lower end of the second partition wall. Provides.

In the case of existing buoyancy valves in non-point pollution reduction facilities, untreated contaminants are buoyant because contaminants (bone, wood chips, plastic, etc.) generated from influent water or backwash water can be trapped in the buoyancy valve watertight point and not watertight properly Although it could be discharged through the valve piping, according to the present invention, an air lift pipe for backwashing is connected between the filter media layers and between the filter media layers when the filter media layer is formed in two stages, so that untreated pollutants Without the problem of discharging, the effect of discharging suspended matters floating in the filter tank or desorbed from the filter media layer into the pretreatment tank by backwash water can be dramatically improved through the aeration effect of air bubbles by the diffuser provided in the lower part of the filter tank.

In addition, backwashing water is supplied from the upper side while the bottom of the filter tank is inclined and the corners are rounded, so that the sludge accumulated at the bottom of the filter tank can be completely washed during backwashing.

1 is a perspective view showing a non-point pollution reduction facility according to an embodiment of the present invention,
2 is a view schematically showing the flow of the filtration process of the non-point pollution reduction facility according to an embodiment of the present invention,
Figure 3 is a view schematically showing the flow of the backwash process of the non-point pollution reduction facility according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known technology may obscure the subject matter of the present invention, a detailed description thereof will be omitted. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification, and the detailed configuration direction of the non-point pollution reduction facility will be described with reference to the drawings. . In addition, throughout the specification, when a certain part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

The present invention is a pretreatment tank in which the inflow water is introduced into the space part; Separated into the pretreatment tank and the first partition wall, communicates with the pretreatment tank by a sluice gate formed under the partition wall, a first filter material layer is installed on the top of the sluice door, and an air lift pipe for backwashing above the first filter material layer A filtration tank having an air diffuser configured to be connected to discharge contaminated backwash water to the pretreatment tank and to generate air bubbles below the first filter material layer; And a treatment tank separated by the filtration tank and the second partition wall and discharging the filtered treated water and supplying backwash water to the filtration tank.

In the present invention, the filter material layer may be provided as a single layer, but of course, it may be provided in multiple layers using the same or different types of filter material. It will be described in detail by way of illustration.

1 is a perspective view showing a non-point pollution reduction facility according to an embodiment of the present invention.

Referring to FIG. 1, the non-point pollution reduction facility 100 according to the present invention includes a pretreatment tank 110 formed with a space through which influent water is introduced; It is separated into the pretreatment tank 110 and the first partition wall 121, communicates with the pretreatment tank 110 by a sluice door 122 formed under the first partition wall 121, and the upper part of the sluice door 122 The first filter material layer 123 and the second filter material layer 124 are installed, and backwash between the first filter material layer 123 and the second filter material layer 124 and on the second filter material layer 124 A filtration tank 120 having an air lift pipe 125 connected to the pretreatment tank 110 to discharge backwash water to the pretreatment tank 110 and having a diffuser pipe 126 generating bubbles under the first filter material layer 123 ; And a treatment tank 130 that is separated into the filtering tank 120 and the second partition wall 131 and discharges the filtered treated water and supplies backwash water to the filtering tank 120.

The pretreatment tank 110 may include a space portion for storing inflow water therein, and an inlet 111 that is a passage through which inflow water is introduced. In addition, the pretreatment tank 110 may be provided with a stagnant water discharge pump 112 for discharging internal stagnant water such as rainwater remaining in the pretreatment tank 110 at the end of a rainfall or washing water after a backwash process.

In addition, in the pretreatment tank 110, a low water level pump 113 may be additionally installed to smoothly discharge stagnant water even when the water level is low.

The filtration tank 120 is a space for filtering the influent water stored in the pretreatment tank 110, and is located separated by a partition wall 121 on one side of the pretreatment tank 110, and a first partition wall adjacent to the pretreatment tank 110 ( It communicates with the pretreatment tank 110 by opening and closing the sluice door 122 formed under the 121). When the influent water flows in with the sluice door 122 open, the collected influent water forms an upward flow that rises into the inside of the filtration tank 120.

Here, in order to start backwashing according to the present invention, the sluice door 122 is closed to completely separate the pretreatment tank 110 and the filtration tank 120, and then discharge stagnant water in the pretreatment tank 110, and After performing the air backwash process by supplying compressed air through the engine 126 and the air lift pipe 125, the water backwash process of supplying backwash water from the treatment tank 130 by opening the sluice door 122 will be performed. It can be, and a specific backwashing process will be described later.

The sluice door 122 is an opening/closing device capable of blocking the flow of influent water between the pretreatment tank 110 and the filtration tank 120, and its operation method, such as an air cylinder, a gear motor, and an actuator, is not particularly limited.

The filter media layers 123 and 124 are means for filtering contaminants of the influent water introduced into the filtering tank 120, and are made of materials commonly used in non-point pollution reduction facilities such as ceramic media and polyurethane foam media. A filter media layer may be applied, and in a preferred embodiment of the present invention, in a preferred embodiment of the present invention, in order to increase the filtering effect, the filter material layer is formed in at least two stages using a different type of filter material to filter and adsorb pollutants contained in the influent water to improve the quality of the influent water. Improve. As shown in FIG. 1, preferably as a two-stage filter material layer, a polyurethane foam and a fiber filter material are applied as the first filter material layer 123, and a ceramic filter material and a fiber filter material are applied as the second filter material layer 124 on the top thereof. I can.

In the present invention, it includes an air lift pipe 125 and a diffuser 126 to perform air backwashing to increase the backwashing efficiency of the non-point pollution reduction facility 100.

The air lift pipe 125 is connected between the first filter material layer 123 and the second filter material layer 124 and above the second filter material layer 124, and air is supplied from the compressed air pump 127 Pollutants floating between the first filter material layer 123 and the second filter material layer 124 and above the second filter material layer 124 are discharged to the pretreatment tank 110. In addition, the diffuser 126 is connected to the compressed air pump 127 to generate bubbles under the first filter material layer 123 to filter and adsorb the first filter material layer 123 and the second filter media layer 124 The polluted material is desorbed, and it is floated between the first filter material layer 123 and the second filter material layer 124 and above the second filter material layer 124.

At this time, the air lift pipe 125 is connected to the pretreatment tank 110 from the filtration tank 120 through the first partition wall 121 to induce an upward flow, and an air supply line connected to the compressed air pump 127 Reference numeral 128 may be connected to the lower side of the air lift pipe 125 to smoothly form an upward flow.

In this way, the air lift pipe 125 for backwashing is connected between the filter media layers 123 and 124 formed in two stages in the filter tank and the upper second filter media layer 124, so that the acid provided at the bottom of the filter tank 120 The effect of floating in the filtration tank 120 through the air bubbles by the engine 126 or desorbed from the filter media layers 123 and 124 passes through the air lift pipe 125 and discharged to the pretreatment tank 110 can be maximized. have.

According to an embodiment of the present invention, the filtration tank 120 has a bottom inclined from the second partition wall 131 to the first partition wall 121 and the lower end portion 129 of the second partition wall 131 May be in a rounded form.

At this time, the backwash water supplied to the filtration tank 120 is a first backwash water supply pipe 132 supplied to the second filter material layer 124 and a second backwash water supply pipe supplied toward the lower end of the second partition wall 131 ( 133). That is, the backwash water from the first backwash water supply pipe 132 is directly supplied to the second filter material layer 124 so that contaminants in the filter media layers 123 and 124 are desorbed, and from the second backwash water supply pipe 133 The backwash water is supplied to the lower end portion 129 of the rounded second partition wall so that the sludge accumulated at the bottom edge portion of the filter tank 120 is completely washed. Here, the sluice door 122 is preferably installed to be opened and closed in close contact with the bottom of the tank so that the backwash water supplied from the second backwash water supply pipe 133 goes smoothly into the pretreatment tank 110 through the sluice door 122 Do.

The non-point pollution reduction facility 100 according to the present invention uses the treated water filtered through the filter tank 120 to supply back to the filter tank 120 as backwash water required for water backwash. That is, the treatment tank 130 is separated into a filtration tank 120 and a second partition wall 131, discharges filtered treated water during normal operation, and supplies backwash water to the filtration tank 120 during backwash.

In the present invention, as described above, after the air backwash by the air lift pipe 125 and the diffuser 126, water backwash may be performed.

The treatment tank 130 is separated into the filtering tank 120 and the second partition wall 131, communicates with the filtering tank 120 through a connector 134 formed on the second partition wall 131, and A backwash pump 135 for supplying treated water to the filtration tank 120, a first backwash water supply pipe 132 connected to the backwash pump 135 and supplied to the second filter material layer 124, a second partition wall A second backwash water supply pipe 133 supplied in the direction of the lower end 129 of the 131 may be provided. In addition, a treated water discharge port 136 for discharging the treated water inside the treatment tank 130 to the outside may be provided.

The connector 134 formed in the second partition wall 131 allows the treated water above the filtering tank 120 that has passed through the second filter material layer 124 to flow into the treatment tank 130, and contaminants are removed. In order to use water for backwashing of the filter media layers 123 and 124, a backwash pump 135 and backwash water supply pipes 132 and 133 may be provided in the treatment tank 130 as described above.

In addition, the treatment tank 130 may be additionally installed with a low water level pump 137 to smoothly supply backwash water even when the water level is low.

A filtration process and a backwash process of the non-point pollution reduction facility according to the present invention configured as described above will be described.

2 is a diagram schematically showing a flow of a filtration process of a non-point pollution reduction facility according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating a backwash process process of a non-point pollution reduction facility according to an embodiment of the present invention. It is a diagram schematically showing the flow.

1 and 2, in the filtration process, when influent water flows into the pretreatment tank 110 with the sluice door 122 open, the water level of the pretreatment tank 110 and the filtration tank 120 rises together ( 2(a)), as the water level of the filtration tank 120 rises to reach the first and second filter media layers 123 and 124, the amount of increase in the water level of the filtration tank 120 becomes less than that of the pretreatment tank 110. A filter material treatment step in which an upward flow passing through the first and second filter media layers 123 and 124 is formed (FIG. 2(b)) and the treated water passing through the first and second filter media layers 123 and 124 (C ) Is stored in the treatment tank 130 through the connector 134 and discharged through the treated water discharge port 136 (FIG. 2(c)).

1 and 3, in the backwashing process according to the present invention, water backwashing may be performed after air backwashing.

First, the stagnant water discharge step (FIGS. 3(a) and 3(b)) of closing the sluice door 122 and discharging stagnant water T in the pretreatment tank 110 is performed.

Thereafter, contaminants in the first and second filter media layers 123 and 124 are desorbed by air bubbles discharged from the diffuser 126 and at the same time, the first and second filter media layers 123 through the air lift pipe 125. And 124), and a step of discharging residual water R (FIG. 3(c)) in which suspended substances and desorbed pollutants above the second filter media layer 124 are discharged to the pretreatment tank 110 is performed.

Next, referring to FIGS. 3(d) and 3(e), water backwash discharges the first washing water A1 remaining in the pretreatment tank 110 after air backwashing, and discharges the first washing water to open the sluice door 122. Step and, through the first backwash water supply pipe 132, the treated water in the treatment tank 130 is supplied downwardly to the first filter material layer 123, and the second partition wall through the second backwash water supply pipe 133 The water backwashing step supplied in the direction of the lower end 129 of (131) and the second washing water discharge step of discharging the second washing water A2 collected in the pretreatment tank 110 through the open sluice door 122 after water backwashing are performed. Performed.

In the above, preferred embodiments of the present invention have been described in detail with reference to the drawings. The description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that other specific forms can be easily modified without changing the technical spirit or essential features of the present invention.

Accordingly, the scope of the present invention is indicated by the claims to be described later rather than the description of the invention, and all changes or modified forms derived from the meaning, scope and equivalent concepts of the claims are interpreted as being included in the scope of the present invention. It should be.

100: non-point pollution reduction facility 110: pretreatment tank
111: inlet 112: stagnant water discharge pump
113: low water level pump of the pretreatment tank 120: filtration tank
121: first bulkhead 122: sluice gate
123: first filter layer 124: second filter layer
125: air lift pipe 126: diffuser
127: compressed air pump 128: air supply line
129: lower end of the second partition wall of the filtering tank 130: treatment tank
131: second bulkhead 132: first backwash water supply pipe
133: second backwash water supply pipe 134: connector
135: backwash pump 136: treated water outlet
137: low water level pump in the treatment tank

Claims (4)

A pretreatment tank in which a space through which influent water is introduced is formed;
Separated into the pretreatment tank and the first partition wall, communicates with the pretreatment tank by a sluice gate formed under the partition wall, a first filter material layer is installed on the top of the sluice door, and an air lift pipe for backwashing above the first filter material layer A filtration tank having a diffuser for generating air bubbles in the lower portion of the first filter material layer by being connected to discharge contaminated backwash water to the pretreatment tank; And
A treatment tank separated by the filtration tank and a second partition wall, discharging the filtered treated water and supplying backwash water to the filtration tank;
Including,
The air lift pipe is connected to the pretreatment tank from the filtration tank through the first partition wall and is installed to induce an upward flow, and an air supply line connected to the compressed air pump is connected to the lower side of the air lift pipe to flow upward when backwashing. A non-point pollution reduction facility for increasing discharge to the pretreatment tank by allowing the formation of, so that the floating material floating in the filter tank through the air bubbles by the diffuser or separated from the first filter material layer passes through the air lift pipe. A pretreatment tank in which a space through which influent water is introduced is formed;
It is separated into the pretreatment tank and the first partition wall, communicates with the pretreatment tank by a sluice gate formed under the partition wall, a first filter material layer and a second filter material layer are installed above the sluice gate, and the first filter material layer and the second filter material layer A filter tank having an air lift pipe for backwashing between the filter media layers and an upper portion of the second filter media layer to discharge contaminated backwash water into the pretreatment tank and to generate air bubbles below the first filter media layer; And
A treatment tank separated by the filtration tank and a second partition wall, discharging the filtered treated water and supplying backwash water to the filtration tank;
Including,
The air lift pipe is connected to the pretreatment tank from the filtration tank through the first partition wall and is installed to induce an upward flow, and an air supply line connected to the compressed air pump is connected to the lower side of the air lift pipe to flow upward when backwashing. Non-point pollution to increase discharge to the pretreatment tank by allowing the air to be formed so that the floating material floating in the filter tank through the air bubbles by the diffuser or separated from the first filter material layer and the second filter material layer passes through the air lift pipe and increases the discharge to the pretreatment tank. Abatement facility. The method according to claim 1 or 2,
The filtering tank is characterized in that the bottom is inclined in the direction of the first partition wall from the second partition wall, and the lower end of the second partition wall has a rounded shape. The method of claim 2,
The backwash water supplied to the filtration tank is supplied through a first backwash water supply pipe supplied to the second filter media layer and a second backwash water supply pipe supplied toward a lower end of the second partition wall.

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