Eco-friendly oxygen water spray system for reducing organic contaminants

Abstract

Disclosed is a system for spraying a road with a liquid including water for road cleaning or salt brine for road snow removal and ice formation prevention, the eco-friendly oxygen water spray system for reducing organic contaminants comprising: a storage tank storing the liquid; an oxygen nanobubble generation device disposed around the storage tank to increase the amount of dissolved oxygen in the liquid; a pipe extending along a road and installed buried in or externally on a median strip, a road surface, or a roadside; a pump transferring the liquid in the storage tank through the pipe; a water temperature controller maintaining the temperature of the liquid within set values; and a plurality of spray nozzles fixedly installed at predetermined intervals along the road, connected to the pipe through high-pressure hoses, and selectively opened to spray the liquid onto the road surface.

Description

Eco-friendly oxygen water injection system to reduce organic pollutants

[0001] This application claims priority to Korean Patent Application No. 10-2023-0098575, filed July 28, 2023, the entire disclosure of which is incorporated herein by reference.

[0002] The present invention relates to an eco-friendly oxygen water injection system for reducing organic pollutants, and more particularly, to an eco-friendly oxygen water injection system for reducing organic pollutants having a structure capable of purifying water for clean roads or brine for road deicing prevention.

[0003] In general, closed water bodies such as rivers, ponds, lakes, dams, and reservoirs, where water flow is slow and stagnant, have a continuous inflow of surface sewage, domestic wastewater, factory and agricultural and livestock wastewater, which increases the concentration of pollutants in the water.

[0004] Nutrients, including nitrogen compounds and phosphates among pollutants, promote the growth and proliferation of microorganisms that decompose organic matter, thus causing eutrophication in freshwater.

[0005] Eutrophication refers to the phenomenon of excessive algal blooms in freshwater caused by the decomposition of organic matter by microorganisms, leading to increased levels of nutrients such as nitrogen and phosphorus. This eutrophication causes serious damage to the lake ecosystem, including reduced freshwater turbidity, foul odors from decaying waste, and, in severe cases, mass fish deaths. Furthermore, in enclosed waters with little water flow, oxygen is depleted in the lower layers, exacerbating water pollution from the bottom.

[0006] Therefore, in closed waters, it is important to maintain a balance so that the amount of nutrients such as nitrogen and phosphorus contained in the aquatic ecosystem does not exceed its self-purification capacity, and it is also very important to increase the dissolved oxygen in the water as much as possible so that the purification process of sinking organic matter and heavy metals can be carried out smoothly.

[0007] However, despite the increase in sewage treatment facilities on the upstream side, many dams, reservoirs, and lakes in the country are still experiencing a deterioration in water quality due to the inflow of large amounts of pollutants and the formation of dense layers over long periods of fresh water.

[0008] Among the major conventional water quality improvement methods, direct purification methods using physical methods include coagulation and sedimentation, direct sedimentation, filtration, aeration, circulation, water purification, and phosphorus recovery technology, while biological methods include direct oxidation, vegetation purification, microbial preparations, and fixation by enzymes. However, as previously discussed, they have limitations in purifying lakes due to short-term purification and local side effects.

[0009] Advances in science and technology have led to the mass production and use of a wide variety of chemicals, raising environmental pollution caused by synthetic chemicals as a social problem. Water pollution caused by non-biodegradable substances, which are difficult to treat using conventional methods, is particularly serious. The problem with hazardous non-biodegradable pollutants is that they are difficult to treat using conventional physical or biological methods alone.

[0010] In addition to the environmental pollution problem of closed water bodies where water flow is slow and stagnant, water pollution caused by early rainfall is also causing serious environmental problems.

[0011] In areas paved with concrete or asphalt, when it rains, the infiltration and retention functions of rainwater are reduced, and highly polluted substances from the initial rainfall flow into nearby sewers or rivers, adversely affecting the water system.

[0012] Pollution that occurs through unspecified emission routes, such as roads, farmland, and construction sites, is called nonpoint pollution. Fine tire dust accumulated on roads, nitrogen oxides (NOx), which are the main culprit of fine dust, pesticide components remaining in farmland, and dust generated at construction sites are all nonpoint pollutants. These are the main cause of river pollution when they are washed away with rainwater when it rains. The reason why these nonpoint pollutants are a problem is that pollutants generated in unspecified places flow directly into rivers when it rains without any special filtration, so they quickly contaminate water quality. Water pollution is much more serious than other types of pollution because it does not simply make water turbid; it can cause mass fish deaths or destroy habitats for plants and animals, disrupting the ecosystem.

[0013] Recently, interest in non-point source pollution reduction devices such as infiltration facilities, retention facilities, and filtration facilities has been increasing to treat non-point source pollution caused by early rainfall.

[0014] Although infiltration facilities and retention facilities, which are called natural non-point source pollution reduction technologies, are said to have good installation effects, they have the disadvantage of taking up a lot of land. Therefore, filtration facilities called filtration-type non-point source pollution treatment facilities are often installed along with natural non-point source pollution reduction facilities. For example, Korean Patent Publication No. 10-1311903 discloses a non-point source pollution filtration treatment device characterized in that a plurality of fiber unit filters are arranged adjacent to each other and continuously inside a debris collection pipe, and polluted water flows through the debris collection pipe, filtering out pollutants and passing through the drain hole of the debris collection pipe to be discharged outside the sedimentation tank.

[0015] Filtration-type non-point source pollution treatment facilities have the advantage of requiring less land area and faster treatment speed than natural types, but have the disadvantage of requiring maintenance such as regular cleaning and replacement of filter media.

[0016] In addition, existing filters only have the function of filtering out pollutant particles, so they have a weakness in that they cannot decompose harmful substances such as nitrogen oxides (NOx) and sulfur oxides (SOx), which are the main culprits of fine dust, and instead pass them through.

[0017] Rainwater, river water, etc. collected in the above-mentioned retention facilities are widely used as road cleaning water. For example, Korean Patent Publication No. 10-1121490 discloses an automatic pavement water cleaning device comprising: a retention tank installed underground for storing cleaning water containing greywater and / or groundwater; a water transmission pipe having one end connected to the retention tank and the other end extending upward to below the center of the paved road surface; a water supply pipe connected to the transmission pipe and extending along the direction of travel of a vehicle below the center of the paved road surface; a plurality of branch pipes having one end connected to the supply pipe and the other end extending upward to the center of the paved road surface and spaced apart along the length of the supply pipe; a plurality of spray nozzles connected to the branch pipes for spraying cleaning water perpendicular to the direction of travel of the vehicle; and a pressurized pump connected to the retention tank for providing a flow pressure of the cleaning water and a spray pressure of the spray nozzles.

[0018] Conventional automatic road cleaning devices, such as the ones described above, operate by spraying rainwater, river water, groundwater, and industrial water directly onto urban roads without any additional treatment. Consequently, contaminants contained in the water stored in storage tanks are not treated and instead sprayed directly onto the road surface through the nozzles, potentially leading to nozzle clogging or reduced spray pressure.

[0019] In addition, there are concerns that the water in the storage tank may contain bacteria such as E. coli, as well as harmful substances such as nitrogen oxides (NOx) and sulfur oxides (SOx), which may cause secondary pollution such as air pollution or water pollution after being sprayed on the road.

[0020] The present invention was created in consideration of the above problems, and its purpose is to provide an eco-friendly oxygen water spraying system for reducing organic pollutants by increasing the dissolved oxygen content of clean road water and spraying cleaner water onto the road.

[0021] Another object of the present invention is to provide an eco-friendly oxygen water injection system for reducing organic pollutants, which can prevent the problem of the amount of dissolved oxygen decreasing due to the increase in water temperature caused by the heating resulting from the operation of an oxygen nanobubble device.

[0022] Another object of the present invention is to provide an eco-friendly oxygen water spraying system for reducing organic pollutants that can improve the air quality around roads in areas where water for clean roads or salt water for road deicing prevention is sprayed.

[0023] In order to achieve the above object, the present invention provides an eco-friendly oxygen water spraying system, which comprises: a storage tank for storing the liquid; an oxygen nanobubble generator for increasing the dissolved oxygen content of the liquid; a pipe extending along the road and installed in a median strip, road surface, or roadside as an embedded or external type; a pump for transferring the liquid in the storage tank through the pipe; a water temperature controller for maintaining the temperature of the liquid within a set value; and a plurality of spray nozzles fixedly installed at set intervals along the road, connected to the pipe through a high-pressure hose, and selectively opened to spray the liquid onto the road surface.

[0024] The above oxygen nanobubble generator can generate oxygen so that the dissolved oxygen content of the liquid sprayed from the spray nozzle is 10 to 55 ppm.

[0025] The above oxygen nanobubble generating device may include an oxygen supplier that provides oxygen gas; and a nanobubble generator that atomizes the oxygen gas supplied from the oxygen supplier to generate oxygen nanobubbles in the liquid.

[0026] The average diameter of the above oxygen nanobubbles may be 200 nanometers (nm) or less.

[0027] The above water temperature controller may be a cooling coil or an air-cooled radiator that cools the liquid and maintains the temperature at 20°C or lower.

[0028] The above oxygen nanobubble generator comprises potassium superoxide (KO2), perfluorodecalin (C 10 F 18 ), may include an oxygen generating composition composed of sodium percarbonate (2Na2CO3·3H2O2) and hydrogen peroxide (H2O2).

[0029] Additionally, the present invention may further include a filter disposed at the front end of the storage tank and having a filter disposed inside that can filter raw water.

[0030] In addition, the filter may further include a first flow meter disposed at the inlet side of the filter and measuring the flow rate before filtration; a second flow meter disposed at the outlet side of the filter and measuring the flow rate after filtration; a first controller determining the time of filter replacement based on the difference between the measured values ​​of the first flow meter and the measured values ​​of the second flow meter; a DO measuring unit measuring the dissolved oxygen amount of the liquid contained in the storage tank; and a second controller selectively operating the oxygen nanobubble generator when the dissolved oxygen amount measured by the DO measuring unit is less than a set value.

[0031] The above-mentioned injection nozzle may be any one selected from a bottom nozzle, a marker nozzle, and a sight guide nozzle.

[0032] The eco-friendly oxygen water injection system according to the present invention has the following effects.

[0033] First, by increasing the dissolved oxygen content of clean road water and generating hydroxyl radicals (OH radicals), pollutants such as organic pollutants can be decomposed, and water with reduced pollutants can be automatically sprayed onto the road to clean and cool the road surface in an environmentally friendly manner.

[0034] Second, when oxygen nanobubbles are aerated in the water in a storage tank, the dissolved oxygen content in the raw water increases, promoting the growth and activity of aerobic microorganisms in the water, which can decompose difficult-to-decompose organic pollutants such as phenols. In other words, the decomposition of organic pollutants is further promoted by the oxidation action of hydroxyl radicals generated when oxygen nanobubbles are aerated, and the effects of sterilization as well as the decomposition of pollutants such as nitrogen oxides (NOx) and sulfur oxides (SOx) can be obtained. The oxidation action by hydroxyl radicals can contribute not only to the decomposition of pollutants in the water in a storage tank, but also to the decomposition of pollutants remaining on the road surface when road water is sprayed.

[0035] Third, even if the water temperature rises due to heat generation from the generation, friction, and collapse of oxygen nanobubbles, it is cooled within the purified water tank and maintained below an appropriate temperature, thereby preventing the amount of dissolved oxygen from decreasing.

[0036] Fourth, the liquid injected into the storage tank can be filtered in advance to prevent clogging of the injection nozzle.

[0037] Fifth, it can improve the air quality around roads in areas where water for clean roads or salt water for road deicing can be sprayed.

[0038] Sixth, when a 360-degree omnidirectional spray floor nozzle is installed as a fixed embedded nozzle on the road surface, water treated to reduce organic pollutants is sprayed simultaneously in all directions 360 degrees around the nozzle, eliminating blind spots and further improving the efficiency of cleaning and removing harmful substances from the road surface.

[0039] Figure 1 is a configuration diagram of an eco-friendly oxygen water injection system according to a preferred embodiment of the present invention.

[0040] Figure 2 is a schematic diagram showing the arrangement structure of the oxygen nanobubble generator in Figure 1 in more detail.

[0041] Figure 3 is a cross-sectional view showing the configuration of the water temperature controller in Figure 2.

[0042] Fig. 4 is a cross-sectional view showing a modified example of Fig. 3.

[0043] Fig. 5 is a schematic diagram showing another embodiment of the water temperature controller in Fig. 2.

[0044] Figure 6 is a plan view schematically illustrating an operation example of an eco-friendly oxygen water injection system according to a preferred embodiment of the present invention.

[0045] FIG. 1 is a schematic diagram illustrating the configuration of an eco-friendly oxygen water injection system for reducing organic pollutants according to a preferred embodiment of the present invention, FIG. 2 is a diagram illustrating in more detail the arrangement structure of the oxygen nanobubble generator in FIG. 1, and FIGS. 3 and 4 are cross-sectional views illustrating the configuration of a purified water tank and a water temperature controller in FIG. 2.

[0046] Referring to FIGS. 1 to 4, an eco-friendly oxygen water injection system for reducing organic pollutants according to a preferred embodiment of the present invention includes a storage tank (100) in which a liquid including water for clean roads or brine for road deicing is stored, an oxygen nanobubble generator (20) for purifying the liquid by increasing the dissolved oxygen content of the liquid, a water level sensor (not shown) installed on one side of the storage tank (100), a pump (104) for pumping the liquid discharged from the storage tank (100), and a water temperature controller (201) interposed at the front end of the storage tank (100) for maintaining the temperature of the liquid within a set value. In addition, the eco-friendly oxygen water injection system includes a control unit (106) that controls the operation of a pump (104) and an electric valve (109), a plurality of injection nozzles (120) that are installed on a road centerline or lane boundary to inject the liquid onto the road surface, a pipe (111) that supplies the injection nozzles (120) whose flow rate and pressure are controlled by the pump (104), a communication card (110) that can transmit and receive a control signal for controlling the injection of the liquid, and a valve box (108) that has an electric valve (109) connected to the communication card (110) built in.

[0047] The above water level sensor is installed on one side of the inside of the storage tank (100) to measure the water level of the liquid for clean road use or the liquid for road deicing to be used for road spraying. The water level sensor may be composed of various water level measuring means such as a locust-type sensor, an ultrasonic sensor, a float-type sensor by the raising and lowering of a buoy, a laser sensor, and a graduated water level gauge. The control board connected to the water level sensor has a predetermined housing, and the internal space of the housing may be filled with polybutene (polybutylene, PB) or insulating oil to waterproof the circuit board so that it is submerged.

[0048] The storage tank (100) has an internal space capable of containing liquids such as clean road water or brine for road deicing prevention. The liquid (water) stored in the storage tank (100) may be rainwater secured through rainwater storage tanks in subway stations, river water supplied from rivers connected to various non-point pollution sources, or tap water used for household, industrial, or agricultural purposes. The dissolved oxygen content of the oxygen nanobubble water stored in the storage tank (100) is maintained at a high level when the temperature is maintained at 20°C or lower, and considering oxidation resistance and corrosion resistance, the storage tank (100) is preferably an underground concrete structure with a storage capacity of, for example, 50 tons or more. Alternatively, the storage tank (100) may be a tank made of stainless steel, fiberglass reinforced plastic (FRP), sheet molding compound (SMC), polyethylene (PE), or the like.

[0049] The upper part of the storage tank (100) is provided with an inlet for injecting clean road water and a cover, and the lower part is provided with a discharge part for discharging the stored water to the outside with a pipe. The eco-friendly oxygen water injection system according to the present invention can be operated as a clean road injection system using groundwater or rainwater storage tank water in the summer, and can be operated as a salt water injection system for road de-icing prevention containing a de-icing agent such as calcium chloride in the winter to melt snow accumulated on the road.

[0050] A vertically arranged stirrer (not shown) may be provided at the inner center of the storage tank (100). The stirrer has a structure in which a stirring blade is installed below a motor fixed to the upper portion of the storage tank (100). The stirrer slowly rotates the stirring blade to stir the fluid stored in the storage tank (100), thereby preventing salt water powder, etc. from settling in the winter or preventing the fluid inside the storage tank (100) from freezing. The installation structure of the stirrer is disclosed in more detail in the registered patent publication No. 10-2073520, which the applicant of the present invention previously applied for and was granted a patent for.

[0051] The oxygen nanobubble generator (20) is placed around the storage tank (100) and performs the function of increasing the dissolved oxygen content of the liquid to be injected (or injected) into the storage tank (100). Preferably, the oxygen nanobubble generator (20) can generate oxygen so that the dissolved oxygen content of the liquid injected from the injection nozzle (120) is 10 to 55 ppm.

[0052] As shown in Fig. 2, the oxygen nanobubble generator (20) includes an oxygen supplier (20a) that provides oxygen gas, and a nanobubble generator (20b) that atomizes the oxygen gas supplied from the oxygen supplier (20a) to generate oxygen nanobubbles in the liquid.

[0053] The oxygen nanobubbles generated from the nanobubble generator (20b) preferably have an average diameter of 200 nanometers (nm) or less to most effectively decompose organic pollutants such as phenol, chloroform, and benzene. The organic pollutants are decomposed by the oxidation of hydroxyl radicals generated when oxygen nanobubbles are aerated in the liquid in the storage tank, and the effects of decomposing pollutants such as nitrogen oxides (NOx) and sulfur oxides (SOx) as well as sterilization can be obtained. The oxidation by hydroxyl radicals can contribute not only to the decomposition of pollutants in the water in the storage tank, but also to the decomposition of pollutants remaining on the road surface when road water is sprayed. In addition, the sterilization effect against bacteria, etc. can be further promoted by the heat generated by the generation, friction, and collapse of oxygen nanobubbles. Oxygen nanobubbles are oxygen bubbles in the nanometer (nm) unit in size and have almost no buoyancy, so they can remain in the water in the storage tank for a long time (about 90 days or more) while undergoing Brownian motion in the state of fine particles. Oxygen nanobubbles generate high energy, heat, and vibration during the instantaneous cavitation and explosion process due to external pressure or deformation in the water in the storage tank or when water is sprayed, thereby generating a large amount of hydroxyl radicals, which are oxidizing substances. After reacting with pollutants, the hydroxyl radicals are reduced to oxygen and water.

[0054] The filter (10) is arranged at the front end of the storage tank (100) and has a configuration in which a filter capable of filtering raw water is arranged inside. Preferably, a first flow meter (11) is arranged at the inlet side of the filter (10) to measure the flow rate of raw water before it is filtered. In addition, a second flow meter (12) is arranged at the outlet side of the filter (10) to measure the flow rate after filtration.

[0055] The first controller (not shown) determines the time of filter replacement based on the difference between the measurement value of the first flow meter (11) and the measurement value of the second flow meter (12). For example, if the measurement value of the second flow meter (12) is half that of the first flow meter (11), the first controller may determine that the filter of the filter (10) is clogged by approximately 50% and output an alarm to notify the filter replacement. The first flow meter (11) and the second flow meter (12), or the first controller, may transmit measurement data or an event occurrence notification to the control panel (106) via a communication network such as, for example, LoRa communication.

[0056] The DO measuring unit measures the amount of dissolved oxygen in the liquid contained inside the storage tank (100). The DO measuring unit may be fixedly installed in the storage tank (100) or a portable measuring device may be used.

[0057] The second controller (not shown) can selectively operate the oxygen nanobubble generator (20) when the dissolved oxygen amount measured by the DO measuring unit is less than a set value. The DO measuring unit and / or the second controller can also transmit measurement data or event occurrence notification to the control panel (106) via a communication network such as LoRa communication.

[0058] The water temperature controller (201) is interposed at least at one location between the oxygen nanobubble generator (20) and the storage tank (100), between the storage tank (100) and the pump (104), or between the pump (104) and the pipe (111) to prevent the water temperature from rising due to the long-term operation of the oxygen nanobubble generator (20). If the water temperature controller (201) is not present, the liquid temperature in the storage tank (100) rises to 20°C or higher. The reason for the rise in the liquid temperature is that the collapse of oxygen nanobubbles is accelerated by friction between the impeller of the pump built into the oxygen nanobubble generator (20) and the liquid, and the heat generated when the nanobubbles collapse is gradually accumulated, causing the liquid temperature to rise. If the liquid temperature rises to 20°C or higher, a problem occurs in which the amount of dissolved oxygen significantly decreases.

[0059] As shown in Fig. 3, the water temperature controller (201) may be configured in the form of a cooling coil that cools the liquid and maintains the temperature at 20°C or lower. A cooling water inlet (201a) and a cooling water outlet (201b) are provided at each end of the cooling coil. A predetermined refrigerant introduced through the cooling water inlet (201a) moves along the coil structure, exchanges heat with the liquid in the purified water tank (200), and is then discharged through the cooling water outlet (201b). More preferably, the refrigerant may be circulated along the cooling coil through a predetermined pump (not shown). The cooling coil structure of the water temperature controller (201) may be replaced with a thermoelectric module.

[0060] The purified water tank (200) is connected to the storage tank (100) and is a container that substantially assists the storage tank (100). It is configured with a relatively small capacity compared to the storage tank (100) and has a temperature controller (201) disposed at the top. That is, since the liquid container used in the clean road system or the salt water injection system usually has a storage capacity of several tens to several hundred tons, the liquid in the purified water tank (200), which holds a relatively small amount of liquid compared to the storage tank (100), is purified and then introduced into the storage tank (100) to collect the treated water, thereby further improving the water treatment performance. Since the purified liquid has an elevated water temperature, it is more effective to cool it in the purified water tank (200), which has a relatively small capacity.

[0061] A separator (206) may be placed inside the purified water tank (200) to separate the space into upper and lower parts and further increase the cooling efficiency by the temperature controller (201). It is preferable that at least one hole (206) be formed in the separator (206) to move the cooled liquid downward. The purified water, which is oxygen nanobubble water with an elevated temperature that flows in through the inlet (204), is cooled by heat exchange with the temperature controller (201) at the upper part of the separator (206) through convection, and the cooled oxygen nanobubble water passes through the hole (206) and moves to the lower part of the separator (206).

[0062] With the cover of the purified water tank (200) closed, the water temperature controller (201) is positioned so that the coil portion is submerged in the liquid contained in the purified water tank (200).

[0063] An inlet (204) for allowing liquid to flow in is provided on one side of the purified water tank (200), and an outlet (205) for allowing liquid cooled by a temperature controller (201) to flow out is provided on the other side at the bottom. Oxygen nanobubble water containing oxygen nanobubbles discharged from an oxygen nanobubble generator (20) flows into the purified water tank (200) through the inlet (204), is collected in the purified water tank (200), is cooled by a temperature controller (201), and is then discharged through the outlet (205) and supplied to the storage tank (100).

[0064] The oxygen nanobubble water contained in the purified water tank (200) can be returned to the oxygen nanobubble generator (20) through the return pipe (204) provided on the upper side as illustrated in FIG. 4 and undergo a circulation process. By undergoing this circulation process, the dissolved oxygen content of the liquid can be further increased.

[0065] A drain valve (203) may be provided at the outlet (205) of the purified water tank (200). The drain valve (203) is selectively opened when a preset quantity, time, or water temperature is reached, thereby supplying oxygen nanobubble water to the storage tank (100).

[0066] FIG. 5 illustrates a water temperature controller (208, 209) according to another embodiment of the present invention. As shown in the drawing, the water temperature controller (208, 209) includes a radiator (208) that cools water passing through it by air cooling, and a cooling fan (209) that is attached to one side of the radiator (208) and circulates air about the radiator (208). According to this configuration, the oxygen nanobubble water discharged from the oxygen nanobubble generator (20) can be cooled by air through a process of passing through the radiator (208) in which outside air is circulated by the cooling fan (209). The radiator (208) is a cooling device that has a plurality of heat dissipation fins and a water circulation path to perform heat exchange with air. At this time, the power for operating the cooling fan (209) may be provided by a solar panel (202) that is inclinedly arranged at the top of the device. A controller (202a) including an inverter or the like may be connected to the solar panel (202). The controller (202a) converts the electricity generated by the solar panel (202) into rated direct current power capable of operating the cooling fan (209) and outputs it to the cooling fan (209).

[0067] As indicated by the arrows in Fig. 5, the raw water may be supplied to the storage tank (100) after passing through the oxygen nanobubble generator (20a, 20b) and the radiator (208) in sequence. Specifically, the raw water may be turned into oxygen nanobubble water through the process of ① -> ② -> ③ -> ④ -> ⑤ and then may be injected into the storage tank (100). The oxygen nanobubble water injected into the storage tank (100) may be returned to the oxygen nanobubble generator (20a, 20b) through the process of ⑥ -> ② and then the process of ③ -> ④ -> ⑤ may be repeated, thereby further increasing the amount of dissolved oxygen. More preferably, the raw water may be circulated between a purified water tank (200) with a relatively small storage capacity (e.g., 200 liters) and an oxygen nanobubble generator (20a, 20b) through the process of ① -> ② -> ③ -> ④ -> ⓐ -> ⓑ -> ⓒ, thereby increasing the dissolved oxygen content more efficiently and then being injected into the storage tank (100).

[0068] Referring again to FIG. 1, the pump (104) is connected to the discharge port of the storage tank (100) through a predetermined pipe and pumps the liquid discharged from the storage tank (100) at a predetermined flow rate and pressure. At least two pumps (104) are provided, and it is preferable that one of the two serves as an auxiliary pump.

[0069] The air supply device (103) is installed on one side of the pipe connected to the storage tank (100) and supplies air to discharge the remaining fluid in the pipe to the outside through the spray nozzle (112). The air supply device (103) may be connected to a separate air compressor, or alternatively, the air supply device (103) itself may be configured as an air compressor. When the road surface washing mode is terminated, the air supply device (103) discharges all remaining clean road water, such as groundwater, spring water, or tap water, remaining in the entire pipe using air pressure to prevent the pipe from freezing in the winter. In addition, when the winter season is over and the road anti-icing mode is terminated, the air supply device discharges all remaining salt water in the pipe using air pressure. If salt water is sprayed on the road surface at any time other than winter, there is a risk of causing a traffic accident by making the road surface slippery. The air supply device (103) discharges the salt water remaining in the pipe through the spray nozzle (112) when the road anti-icing mode is terminated, thereby preventing salt water from being sprayed during the road surface washing mode.

[0070] The liquid discharged from the storage tank (100) and pumped by the pump (104) is supplied to the pipe (111) via the main pipe (105).

[0071] A pump station is a facility that surrounds the exterior of a pump (104), a main pipe (105), an air supply device (103), a control unit (106), etc. to protect them. The pump station may be constructed as a house made of a concrete structure, etc., or a container, etc.

[0072] A pipe (111) is installed along the road or around the road to transport liquid pumped by a pump (104) and supply it to the injection nozzle (112). The pipe (111) may be buried underground under the road surface, or at least part of it may be exposed to the outside as needed.

[0073] The control unit (106) controls the operation of the pump (104) to control the flow rate and pressure of the liquid, on / off control, etc. The control unit (106) can be remotely controlled by communicating with a remote control device (107) that is composed of a remote control system including a remote mobile phone (smartphone) (103a) and / or a central control device (103b) which is a computer located in a central control room. The remote control device (107) can perform data communication with the control unit (106) through wired or wireless Internet, various serial communications, etc. Specifically, communication between the remote control device (107) and the control unit (106) can be performed according to at least one communication protocol selected from among, for example, LoRa, CDMA, LTE, Ethernet, CAN, RS422, RS232, and RS485. At least one communication protocol selected from among LoRa, CDMA, LTE, RS422, RS232, and RS485 may be used for communication between the control unit (106), the storage tank (100), the pump (104), the detection unit (113), and the electric valve (109).

[0074] The control unit (106) is preferably provided within a control panel having a metal housing. The control panel is preferably installed spatially within the pump station, but is not limited to this example. The control panel performs control of the valve box (108), control of the pump (104) or various control valves within the pump station, control of the main pipe (105), operation control of the agitator, and switching control for manual / automatic operation modes.

[0075] The wireless communication that can be used in the present invention includes various wireless communication standards, including IoT-related communication standards such as Bluetooth, LoRa communication, and NB-IOT, as well as LoRa, CDMA, LTE, and 5G.

[0076] The valve box (108) may be installed externally or embedded in the road surface or around the road. The valve box (108) may be arranged one-to-one with each spray nozzle (120). This one-to-one control method may be applied to a salt spray system in which each spray nozzle (112) is arranged at a wide interval of, for example, several tens of meters. Alternatively, the valve box (108) may be arranged one-to-one for each spray zone including a plurality of spray nozzles (120), as shown in FIG. 9. This batch control method may be applied to a cooling road system in which a plurality of spray nozzles (120) are arranged relatively densely to wash or cool the road surface.

[0077] The eco-friendly oxygen water injection system according to the present invention is equipped with a detection unit (113) that detects the injection state and standby state of the injection nozzle (112) and transmits them to a remote control device (107) comprising a remote control system including a mobile phone (107a) or a central control device (107b) through a control unit (106).

[0078] The detection unit (113) is equipped with at least one detection sensor among a fine dust detection sensor that detects fine dust, a hazardous substance detection sensor that detects at least one selected from sulfur oxides, nitrogen oxides, volatile organic compounds, and radon, and other hazardous substances prescribed by the Ministry of Environment Ordinance, a temperature and humidity detection sensor that detects temperature and humidity, a rain detection sensor that detects the amount of snow or rain, and a road detection sensor that checks the state of snow or rain accumulated on the road surface. In addition, a detection signal output from the detection unit (113) is transmitted to the control unit (106) through a communication card box (114).

[0079] Additionally, a video surveillance camera (116) that enables real-time confirmation of the spraying status, etc., and an information display board (117) composed of an LED or liquid crystal display device that displays the spraying status of the liquid, the concentration of fine dust, and the weather conditions may be placed around the detection unit (113). In addition, a broadcasting device (not shown) equipped with a speaker that outputs voice to guide and control the on-site situation in real time in conjunction with the information display board (117) may be installed on one side of the periphery.

[0080] The guide display board (118) is installed on a predetermined support on the ground in the middle of the road or around the road, for example, as an LED display board, and displays phrases such as "Spraying water", "Spraying salt water", or "Drive safely" to vehicles entering a section where a spray nozzle (112) is installed. The guide display board (118) displays the phrase "Spraying water" or "Spraying salt water" before the vehicle enters the section where a spray nozzle (120) is installed, so that the driver can recognize the water spraying state in advance, and displays the phrase "Drive safely" when the vehicle exits the section where a spray nozzle (120) is installed or when the water spraying has stopped, so as to draw the driver's attention.

[0081] The spray nozzle (120) may be any one selected from a floor nozzle, a marker nozzle, and a sight guide nozzle. The spray nozzle (120) is installed on the road surface and is connected to a pipe (111), and receives the liquid through the pipe (111) and sprays it onto the road surface. In particular, the floor nozzle refers to a nozzle whose upper surface is positioned on the same plane as the surface of the road surface and has an outer shape that matches the overall road surface. A representative floor nozzle is the '360-degree spray floor nozzle' disclosed in Korean Patent No. 10-2118827, which the applicant of the present invention previously applied for and was granted a patent for. The 360-degree spray floor nozzle includes a base having a flat upper surface so as to be positioned on the same plane as the road surface, a nozzle block assembled to a lower surface of the base, and a disk-shaped valve (see V of FIG. 5) that is movably assembled to the nozzle block so as to be positioned at the center of the base. When liquid is supplied to the injection nozzle through the pipe (111), the disc-shaped valve (V) is momentarily pushed up (popped up) by the water pressure, opening the injection port and simultaneously spraying liquid in all directions of 360 degrees.

[0082] An eco-friendly oxygen water injection system having the above configuration is constructed through a construction method including a excavation process, a pipe installation process, a tubular support arrangement process, a floor nozzle installation process, a foundation concrete pouring process, and an asphalt paving and painting process.

[0083] In the excavation process, a excavation work is performed on a designated section of the roadside or road surface to form a passage for burying a pipe.

[0084] In the pipe installation process, the pipe (111) is installed along the above pipe embedding passage.

[0085] In the tubular support arrangement process, tubular supports (50) are arranged at each designated point of the pipe (111), and a high-pressure hose is connected to the pipe (111) and introduced into the interior of the tubular support (50). The end of the high-pressure hose is connected to the spray nozzle (120).

[0086] The injection nozzle (120) includes a base having a flat upper surface as described above and a mounting hole formed in the center, a nozzle block assembled to the lower surface of the base, and a disk-shaped valve (V) assembled to the nozzle block so as to be placed within the mounting hole.

[0087] In the process of installing the bottom nozzle, the male thread of a predetermined nipple connected to the connecting hose is fastened to the female thread formed in the nozzle block, the base is placed on the top of the tubular support, and then the bolts are fastened to assemble.

[0088] In the foundation concrete pouring process, foundation concrete is poured into the above pipe embedding passage to secure the tubular support.

[0089] In asphalt paving and painting processes, asphalt is paved with the top surface of the ground nozzle exposed to the outside, and then the lane is painted. It is preferable for the asphalt paving process to be performed with the ground nozzle embedded in the road surface, with the top surface exposed and not protruding above the road surface.

[0090] Figure 6 is a plan view showing an operation example of an eco-friendly oxygen water injection system for reducing organic pollutants according to a preferred embodiment of the present invention.

[0091] A storage tank (100), an oxygen nanobubble generator (20), a purified water tank (200), a pump (104), a control unit (106), etc. included in an eco-friendly oxygen water injection system for reducing organic pollutants according to a preferred embodiment of the present invention are placed in a designated area around a road, a pipe (111) is buried along a center divider or lane boundary of the road, etc., and a spray nozzle (120) is connected to a high-pressure hose branched from the pipe (111) and installed on the road surface.

[0092] As described above, the oxygen nanobubble generator (20) is placed between the filter (10) and the storage tank (100) to increase the dissolved oxygen content of the liquid sprayed onto the road. The purified liquid is transported to the spray nozzle (120) via a pipe (111) and can be sprayed onto the road surface as a liquid for clean roads or a liquid for preventing road icing.

[0093] The injection nozzle (120) may be positioned, for example, near the centerline of a road. The area near the centerline of the road includes a hill section where the road surface shape is designed to be relatively raised or convex compared to the surrounding area, and is configured to ensure smooth drainage on both sides of the hill section.

[0094] When a 360-degree spray-type floor nozzle is employed as the spray nozzle (120), a disk-type valve (V) is minutely protruded from the center of the upper surface of the 360-degree spray-type floor nozzle, but when pressed by the tire of a vehicle, the disk-type valve (V) is lowered together with the nozzle block by a predetermined elastic member and goes below the surface of the road surface, so that it does not interfere with the operation of the vehicle and damage to the disk-type valve (V) itself can also be prevented.

[0095] When liquid is supplied to the spray nozzle (120) through the pipe (111), the disc-shaped valve (V) is instantly pushed up to a predetermined height by the hydraulic pressure of the liquid, and the liquid is sprayed in all directions in all directions on the road surface through the gap formed under the circular edge of the disc-shaped valve (V), thereby performing a watering operation in all directions. The liquid sprayed in all directions in all directions flows over a wide area of ​​the road surface, washes away fine dust and foreign substances, and is discharged into a drain through a drain (150) installed on the side of the road.

[0096] After the washing work on the road surface is completed and the liquid pressure is released, the disc-type valve (V) can be lowered and returned to its original position by its own weight or easily lowered and returned when pressed by an external force such as a vehicle tire, thereby preventing foreign substances from entering the nozzle block.

[0097] Although the present invention has been described above with limited embodiments and drawings, the present invention is not limited thereto, and various modifications and variations are possible within the equivalent scope of the technical idea of ​​the present invention by a person having ordinary skill in the art to which the present invention pertains.

[0098] When the present invention is applied, the purified liquid can be used as clean road water or salt water for road de-icing and anti-icing, using simple equipment and at low cost, thereby efficiently improving the air, water quality and soil environment around the road.

Claims

1. In a system for spraying liquid containing water for clean roads or salt water for road deicing and anti-icing onto roads, A storage tank for storing the above liquid; An oxygen nanobubble generator that increases the dissolved oxygen content of the liquid; Pipes that extend along the road and are installed embedded or externally in the median strip, road surface, or roadside; A pump that transports the liquid in the above storage tank through the above pipe; A water temperature controller that maintains the temperature of the liquid within a set value; and An eco-friendly oxygen water injection system for reducing organic pollutants, comprising a plurality of injection nozzles that are fixedly installed at set intervals along the road, connected to the pipe through a high-pressure hose, and selectively opened to spray the liquid onto the road surface.

2. In the first paragraph, the oxygen nanobubble generator, An eco-friendly oxygen water injection system for reducing organic pollutants, characterized in that it generates oxygen so that the dissolved oxygen content of the liquid injected from the injection nozzle is 10 to 55 ppm.

3. In the second paragraph, the oxygen nanobubble generator, An oxygen supply device that provides oxygen gas; and An eco-friendly oxygen water injection system for reducing organic pollutants, characterized by including a nanobubble generator that generates oxygen nanobubbles in the liquid by atomizing oxygen gas supplied from the oxygen supply device.

4. In paragraph 3, An eco-friendly oxygen water injection system for reducing organic pollutants, characterized in that the average diameter of the above oxygen nanobubbles is 200 nanometers (nm) or less.

5. In paragraph 3, An eco-friendly oxygen water injection system for reducing organic pollutants, characterized in that the above water temperature controller is a cooling coil or air-cooled radiator that cools the liquid and maintains the temperature at 20°C or lower.

6. In paragraph 1, An eco-friendly oxygen water injection system for reducing organic pollutants, further comprising a filter disposed in front of the above storage tank and having a filter disposed inside capable of filtering raw water.

7. In paragraph 6, A first flow meter positioned at the inlet of the filter to measure the flow rate before filtration; A second flow meter positioned at the outlet side of the filter to measure the flow rate after filtration; A first controller that determines the time of filter replacement based on the difference between the measurement value of the first flow meter and the measurement value of the second flow meter; A DO measuring unit for measuring the dissolved oxygen content of the liquid contained within the above storage tank; and An eco-friendly oxygen water injection system for reducing organic pollutants, further comprising a second controller that selectively operates the oxygen nanobubble generator when the dissolved oxygen amount measured by the DO measuring unit is less than a set value.

8. In paragraph 7, An eco-friendly oxygen water injection system for reducing organic pollutants, characterized in that the above injection nozzle is any one selected from a bottom nozzle, a marker nozzle, and a line-of-sight nozzle.

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