KR101271740B1 - Rainwater reusing system and method through purification of non-point source pollutants - Google Patents

Abstract

Disclosed are a good recycling system and method through nonpoint pollutant purification. The disclosed water recycling system has a screen tub having different voids at the bottom of the channel, and having first to third filtering nets 102, 103, 104 having protrusions 113 and steel gratings 101 at the upper openings. 100; It is installed in the rear of the screen tank 100, the porous chemical filter 211 for the antibacterial and odor removal of the rectangular sludge installed in the center of the bottom, and is installed at the bottom of the porous chemical filter 211, floating pollutant Rubble filtration layer 202 for separating the sediment, the water collecting passage 203 is installed at the lower end of the rubble filtration layer 202, and the rubble loss prevention network installed between the collecting passage 203 and the rubble filtration layer 202 Natural type purification tank 200 is installed; And, if installed in the downstream of the natural purification tank 200, the inlet blocking valve 305, which can block the inflow of rainwater, the separation membrane 301, the ultrasonic generator 302 installed on the side or bottom of the separation membrane And, when the pressure is greater than the set value, the inlet shut-off valve 305 is operated to shut off the rainwater, the debris attached to the separator 301 by the operation of the ultrasonic vibrator 303 is removed, the residual water after a certain time Membrane filtration / cleaning tank 300 including a control device 309 to control the discharge; includes, wherein the porous chemical filter 211, 20 to 65% by weight of synthetic resin, 10 to 45% by weight inorganic filler (5 ~ 10㎛ 7-30% by weight, 3 ~ 15% by weight below 3㎛) and 0.1% to 5% by weight of silicon oxide compounds, 5-10% by weight of nanoclay, transition metals (chromium, copper, zinc, manganese , Iron, nickel, copper) having a composition ratio of 0.3% by weight to 10% by weight.

Description

Rainwater Reusing System and Method through Purification of Non-Point Source Pollutants}

The present invention relates to a rainwater reuse system and method through the purification of nonpoint pollutants contained in the initial rainwater, and more particularly, the natural purification of the nonpoint pollutants contained in the initial rainwater by screens, aquatic plants and various aquatic microorganisms. The present invention relates to an excellent recycling system and method for recycling the treated water.

In general, nonpoint source is easy to collect due to the cleared outflow route, relatively less influence from surrounding environment, and unlike point source of predictable pollution load, it can be used in unspecified places such as cities, roads, farmland, mountains, and construction sites. It refers to a pollutant that emits unspecified water pollutants.It is very difficult to collect because pollutant spills and discharge paths are not clearly distinguished, and systematic management is different from point pollutants because the amount and emission are highly dependent on weather conditions such as precipitation. it's difficult.

These non-point pollutants enter the stream with rainwater during the rainy season, causing eutrophication of the appeal, and microparticles such as soil and sand are leaked and accumulated in the gravel layer of the river, destroying habitats and spawning places of benthic organisms, fish, etc. Disturb and contaminate.

In addition, due to the progress of urbanization and industrialization, land development is accelerating, and as the permeable layer area such as land, road, and parking lot increases, the water quality impact of rivers and appeals caused by nonpoint source is also increasing.

The impact of land pollution, which accounts for most of non-point pollution, on river water quality is 28.3% (Hangang River), 20-30% (Nakdong River / Geum River), and 20-40% (Yongsan River / Sumjin River). In the case of non-point pollution load calculation, the proportion of sewage pipe drainage and untreated livestock manure, in addition to the land system, exceeds 50%, and is expected to increase to 65-70% in 2015.

Conventional methods for treating such non-point pollutants include natural reservoirs, artificial wetlands, infiltration facilities, vegetation-type facilities and device-type filtration facilities, vortex-type facilities, screen-type facilities, flocculation sedimentation facilities, Although there is a biological treatment facility, the method has a limitation in comprehensively treating a non-point source containing various pollutants in a manner of treating a part of the pollutants discharged with rainwater.

In addition, in the situation where water resources are decreasing due to the influence of anthropogenic factors such as the trend of climate change and economic and social development, technologies for reusing rainwater in the aspect of securing water resources are being studied in various fields. The level of separation of only particulate matter in the state, the limit is revealed to secure a high quality treatment water suitable for reuse.

1. Korea Patent Registration No. 10-0794491 (2008.01.08) 2. Korea Patent Registration No. 10-1177477 (2012.08.21)

The present invention is a technology devised to solve the above problems, the coarse contaminants contained in a high concentration in the initial excellent in advance to remove, dissolved organic matter (DOC), nutrients through aquatic plants and many aquatic microorganisms ( N, P, etc.), suspended solids (SS), heavy metals, etc. are removed in a natural-friendly purification method to reduce water pollution and provide stable reuse of water, as well as to effectively prevent odors caused by decay of deposited sludge. To provide a good recycling system and method through the non-point pollutant purification.

The storm water recycling system for achieving the object of the present invention, the first to third filter nets (102, 103, 104) having different voids at the bottom of the channel, each having a protrusion 113, and the steel grating in the upper opening A screen tank 100 in which 101 is installed; It is installed in the rear of the screen tank 100, the porous chemical filter 211 for the antibacterial and odor removal of the rectangular sludge installed in the center of the bottom, and is installed at the bottom of the porous chemical filter 211, floating pollutant Rubble filtration layer 202 for separating the sediment, the water collecting passage 203 is installed at the lower end of the rubble filtration layer 202, and the rubble loss prevention network installed between the collecting passage 203 and the rubble filtration layer 202 Natural type purification tank 200 is installed; And, if installed in the downstream of the natural purification tank 200, the inlet shut-off valve 305 that can block the inflow of rainwater, the separation membrane 301, the ultrasonic membrane vibrator 303 is installed on the side or bottom of the separation membrane Ultrasonic generator 302 and the inlet shut-off valve 305 is activated when the pressure is greater than the set value is the excellent inflow is blocked, by the operation of the ultrasonic vibrator 303 contaminants attached to the separation membrane 301 Desorption, the membrane filtration / washing tank 300 including a control device 309 for controlling to discharge the residual water after a predetermined time, the porous chemical filter 211, 30 ~ 65 weight of synthetic resin %, Inorganic filler 10 to 45% by weight, silicon oxide compound 0.1 to 5% by weight, nanoclay 5 to 10% by weight, polymer composed of transition metals (chromium, copper, zinc, manganese, iron, nickel, copper) 0.3 It is characterized by having a composition ratio of 10% by weight to 10% by weight.

The pores of the first filtering net 102 are the largest, the size of the pores becomes smaller in order of the second filtering net 103 and the third filtering net 104, the first to third filtering nets (102, 103, 104) It is preferable that the pore size of) be comprised between 5 mm and 20 mm.

In addition, storm water recycling method for achieving the object of the present invention, in the storm water recycling method using the storm water recycling system described above, a) to remove the high concentration of contaminants and soil contained in the initial rain in the screen tank 100, etc. step; b) removing the organic / inorganic contaminants in the natural type purification tank 200; c) discharging the treated water treated in the natural purification tank 200 to the membrane filtration / cleaning tank 300 through the water collecting passage 203 and then producing recycled water through the separation membrane 301. ; And d) discharging the residual water passing through the membrane filtration / cleaning tank 300 to the sewage pipe or the screen tank.

Here, the step c), the inlet shut-off valve 305 of the membrane filtration / cleaning tank 300 is operated when the pressure is greater than the set value through the control device 309 through the water collecting channel 203 Inflow is blocked, the contaminants attached to the separation membrane 301 by the operation of the ultrasonic vibrator 303, the residual water is discharged after a predetermined time, the pressure of the pressure gauge installed in the pipe connected to the separation membrane 301 The ultrasonic vibrator 303 is stopped when the value is restored to the set value or less.

In addition, it is preferable that the ultrasonic intensity of the ultrasonic vibrator 303 is 200 W or more and the ultrasonic frequency has different ultrasonic frequencies within a range of 35 kHz to 120 kHz.

Rainwater reuse system and method through the non-point pollutant purifying according to the present invention, as the initial rainwater emission reduction type to delay or reduce the rainwater discharged by temporarily storing and penetrating the initial rainwater, and to prevent the flood due to rainfall By removing non-point contaminants contained in the initial excellent water through physical and biological processes, it is possible to drastically reduce the amount of water pollution.

In addition, as an improved treatment method having a water resource and ecological conservation function by reusing treated water through membrane separation, there is an effect of preventing the odor of the removed sludge to prevent odor and improve the surrounding environment.

1 is a process flow diagram showing the storm water recycling system 10 according to an embodiment of the present invention,
2 is a view for explaining the configuration of the screen tank 100 that is a component of the storm water recycling system 10 shown in FIG.
3 is a cross-sectional view for explaining the configuration of the natural type purification tank 200 that is a component of the storm water recycling system 10 shown in FIG.
4 is a view for explaining the configuration of the membrane filtration / cleaning tank 300 that is a component of the storm water recycling system 10 shown in FIG.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Detailed descriptions of well-known functions and constructions which may be unnecessarily obscured by the gist of the present invention are omitted.

Hereinafter, with reference to the accompanying drawings will be described a non-point pollutant purification and rainwater reuse method according to a preferred embodiment of the present invention.

1 is a process flow diagram showing the storm water recycling system 10 according to an embodiment of the present invention, the storm water recycling system 10, the screen bath 100, natural purification tank 200, membrane filtration / cleaning bath It consists of 300, and includes a treatment water pipe 123, a sewage pipe 124, and a feedback pipe (125). In addition, in consideration of the fact that non-point pollutants are concentrated in the initial excellent rainwater, a separate excellent bypass pipe (122, By-pass piping) is used to exclude the rainwater from entering the initial excellent storage capacity. (See FIG. 1).

Referring to FIG. 2, the screen tank 100 is installed at the inlet of the natural purification tank 200 to prevent rainwater from overflowing due to screen clogging and to remove sediments / soil from rainwater at the bottom of the waterway. The first to third filter nets 102, 103 and 104 are installed. In FIG. 2, the arrow indicates the direction in which the rainwater flows, and a protrusion 113 protruding above the downstream sidewall is provided at the rear end of the three filter nets 102, 103, and 104 for reducing the flow rate and improving the screen function. The first to third filtering nets 102, 103, and 104 have different voids in the filtering net, the largest of the first filtering nets 102, and the voids in the order of the second filtering net 103 and the third filtering net 103. Becomes smaller. Here, the pore size of the first to third filter nets 102, 103, and 104 is preferably configured to be between 5 mm and 20 mm.

The earth and sand separated through the screen tank 100, the steel grating 101 is installed in the upper opening of the screen tank 100 in consideration of the maintenance convenience in the treatment, and the first to third filter net 102, 103, 104) the lifting ring (not shown) is installed on both sides. Therefore, when lifting the filtering nets to process the soil and contaminants, the skill grating 101 is opened, and then the lifting rope (not shown) is connected to the lifting ring and lifted.

3, the natural type purification tank 200, a porous chemical filter 211 for the antibacterial and odor removal of the rectangular sludge installed in the center of the bottom, the rectangular rubble filtration layer 202 for separating the suspended pollutant And a collecting passage 203 and rubble loss prevention network 201. The porous chemical filter 211 includes 30 to 65% by weight of synthetic resin, 10 to 45% by weight of inorganic filler (5 to 10 μm, 7 to 30% by weight, 3 to 15% by weight or less), and 0.1% to 20% of silicon oxide compound. It has a composition ratio of 0.3% to 10% by weight of a polymer composed of 5% by weight, 5-10% by weight of nanoclay, and transition metals (chromium, copper, zinc, manganese, iron, nickel, copper). Odor flowing through the porous chemical filter 211 is adsorbed by the transition metal and chemically removed. The chemical filter also serves to prevent rubble from escaping from the rubble filtration layer 202 installed at the bottom thereof. The rubble loss prevention net 201 provided between the rubble filtration layer 202 and the water collecting passage 203 prevents rubble from being lost in the direction of the water collecting passage 203.

The membrane filtration / cleaning tank 300 removes residual contaminants. Referring to FIG. 4, the membrane filtration / cleaning tank 300 includes a separator 301, an ultrasonic wave generator 302, and a controller 309. The ultrasonic generator 302 including the ultrasonic vibrator 303 and the ultrasonic vibrating plate 304 is located in the side surface of the separator 301. However, the ultrasonic wave generator 302 may be located in the lower water of the separator 301. The membrane filtration / cleaning tank 300 includes a suction pump 307 and a pressure gauge 308 in the first pipe 321, a drain pump 306 in the second pipe 322, and a third pipe. 331 is provided with an inlet shut-off valve 305 to block the inflow of rainwater when the pressure value of the pressure gauge 308 rises due to fouling of the separator. The control device 309 analyzes the value of the pressure gauge 308 installed together with the suction pump 307, and when the pressure exceeds the set value, the membrane filtration / cleaning tank 300 inlet shutoff valve 305 is activated to operate the water collecting passage 203. Rainwater inflow is blocked through, the operation of the suction pump 307 is stopped and at the same time the decontamination of the contaminants attached to the separator 301 by the operation of the ultrasonic vibrator 303, after a certain time through the drain pump 306 Drain the residual water.

Hereinafter, a rainwater recycling method using the rainwater recycling system according to an embodiment of the present invention described above will be described in detail with reference to FIGS. 1 to 4.

The excellent recycling method according to an embodiment of the present invention is a screen step that is treated in three stages by three filter nets (102, 103, 104), a natural purification step using aquatic plants and a variety of underwater microorganisms, membrane filtration for reuse of the treated water Includes cleaning steps.

First, referring to FIGS. 1 to 4, the inflow water (excellent) first passes through the screen tank 100. The rainwater that passed through the screen tank 100 is removed from organic / inorganic non-point pollutants by aquatic plants and various aquatic microorganisms in the natural type purification tank 200, and rectangular rubble filtration installed in the center of the natural type purification tank 200. After passing through the layer 202, the suspended pollutant is separated, and then naturally introduced into the membrane filtration / cleaning tank 300 through the water collecting passage 203. At this time, by the porous chemical filter 211 installed on the top of the rubble filtration layer 202 to suppress the bacteria in the organic / inorganic non-point contaminants (sludge) and to prevent decay, the bottom of the rubble loss prevention network 201 of the rubble Prevent loss.

The treated water passing through the natural purification tank 300 and the rubble filtration layer 202 is introduced into the membrane filtration / cleaning tank 300 to remove residual contaminants, and the membrane filtration / cleaning tank 300 is the separation membrane 301. And an ultrasonic wave generator 302, and the ultrasonic wave generator 302 including the ultrasonic vibrator 303 and the ultrasonic vibrating plate 304 as shown in FIG. 4 is located at the bottom or side surface of the membrane 301, and the membrane detachment and Ultrasonic frequency for suppressing fouling is 35kHz ~ 120kHz, ultrasonic intensity is over 200W.

In this case, the ultrasonic wave generator 302 having different frequencies within the range of 35 kHz to 120 kHz is provided in the ultrasonic irradiation, and thus the size of the generated bubbles and the explosion energy of the bubbles are different from each other. The supersonic effect of multiple ultrasonic waves improves the ultrasonic cleaning effect and the blocking effect.

The permeation rate (Flux) and the cleaning effect of the separation membrane 301 by the ultrasonic wave are the main influence factors, and the difference in the cleaning power is inversely related to the bubble size and when each bubble explodes. Since the reserve energy is proportional to the size of the bubble, the device for the purpose of removing the fine particles attached to the surface of the separator 301 is preferably operated at a frequency of 120 kHz or less.

A pressure gauge 308 is provided in the connection pipe of the suction pump 307, and the inlet shutoff valve 305 is locked when the pressure rises due to the fouling of the separation membrane 301, and the operation of the suction pump 307 is temporarily stopped. After cleaning the separation membrane 301 by the operation of the ultrasonic vibrator 303, the ultrasonic vibrator 303 stops after a predetermined time, the inlet shutoff valve 305 is opened, the suction pump 307 is operated to filter the membrane 301. This restarts.

The residual water in the membrane filtration / cleaning tank 300 generated at this time is transferred to the screen tank or sewage pipe by the drain pump.

The embodiment of the non-point pollutant purification and rainwater reuse method according to the present invention described above is merely exemplary, and those skilled in the art to which the present invention pertains various modifications and other equivalents therefrom. It will be appreciated that examples are possible. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

10: Excellent reuse system 100: Screen tank
101: steel grating
102, 103, 104: first to third filtration networks
122: excellent housing hall 123: water treatment fee
124: sewage pipe 125: feedback pipe
113: protrusion 200: natural type purification tank
201: rubble loss prevention network 202: rubble filtration layer
203: collection channel 211: porous chemical filter
300: membrane filtration / cleaning tank 301: separation membrane
302: ultrasonic generator 303: ultrasonic oscillator
304: ultrasonic vibration plate 305: inlet shutoff valve
306: drainage pump 307: inlet pump
308: pressure gauge 309: controller
321,322,331: first to third pipe

Claims (5)

Screen tanks 100 having different voids at the bottom of the channel, each having first to third filter nets 102, 103, 104 having protrusions 113, and steel gratings 101 installed at the upper openings;
It is installed in the rear of the screen tank 100, the porous chemical filter 211 for the antibacterial and odor removal of the rectangular sludge installed in the center of the bottom, and is installed at the bottom of the porous chemical filter 211, floating pollutant Rubble filtration layer 202 for separating the sediment, the water collecting passage 203 is installed at the lower end of the rubble filtration layer 202, and the rubble loss prevention network installed between the collecting passage 203 and the rubble filtration layer 202 Natural type purification tank 200 is installed; And
When installed in the downstream of the natural purification tank 200, the inlet shut-off valve 305 that can block the inflow of rainwater, the separation membrane 301, and is installed on the side or bottom of the separation membrane and equipped with an ultrasonic vibrator 303 Ultrasonic generator 302 and the inlet shut-off valve 305 is activated when the pressure is greater than the set value is blocked the inflow of rain, the ultrasonic vibrator 303 to remove the contaminants attached to the separation membrane 301 And a membrane filtration / cleaning tank 300 including a control device 309 for controlling the discharge of residual water after a predetermined time.
The porous chemical filter 211, 30 to 65% by weight of synthetic resin, 10 to 45% by weight of inorganic filler, 0.1 to 5% by weight of silicon oxide compound, 5 to 10% by weight of nanoclay, and transition metals (chromium, copper , Zinc, manganese, iron, nickel, copper) excellent recycling system through the non-point pollutant purification, characterized in that having a composition ratio of 0.3% by weight to 10% by weight. The method of claim 1,
The pores of the first filtering net 102 are the largest, the size of the pores becomes smaller in order of the second filtering net 103 and the third filtering net 104, the first to third filtering nets (102, 103, 104) ) Pore size is excellent reuse system through non-point pollutant purification, characterized in that composed between 5mm ~ 20mm. In the storm recycling method using the storm recycling system according to claim 1,
a) removing the high concentration of contaminants and earth and sand contained in the initial rain in the screen tank 100;
b) removing the organic / inorganic contaminants in the natural type purification tank 200;
c) discharging the treated water treated in the natural purification tank 200 to the membrane filtration / cleaning tank 300 through the water collecting passage 203 and then producing recycled water through the separation membrane 301. ; And
and d) discharging the residual water that has passed through the membrane filtration / cleaning tank (300) to sewage pipes or screen tanks. The method of claim 3, wherein c) is
When the pressure exceeds the set value through the control device 309, the inlet shutoff valve 305 of the membrane filtration / cleaning tank 300 is operated to block the inflow of rainwater through the water collecting passage 203, the ultrasonic vibrator Operation of the 303 to remove the contaminants attached to the separation membrane 301, discharge the residual water after a certain time, the pressure value of the pressure gauge installed in the pipe connected to the separation membrane 301 is restored to below the set value When the ultrasonic vibrator (303) when the excellent recycling method through the non-point pollutant purification, characterized in that the operation. The method of claim 4, wherein
Ultrasonic intensity of the ultrasonic vibrator (303) is 200W or more and the ultrasonic frequency is excellent reuse method through the non-point pollutant purification, characterized in that it has a different ultrasonic frequency in the range of 35kHz to 120kHz.

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