Water purification system and water purification method

Abstract

To provide a water purification system that not only has sufficiently high clogging prevention effect of an irrigation tube and purification effect of raw water, but also does not require a mixing pump for mixing a water-purifying agent into raw water, and in which a mixing device for mixing the water-purifying agent into raw water does not need to be arranged downstream each opening / closing valve.SOLUTION: A water purification system 10 of raw water comprises: raw water feeding means 1 for feeding raw water into the water purification system; a water-purifying agent immersion device 2 arranged downstream the raw water feeding means and for immersing a solid water-purifying agent into the raw water; opening / closing valves 3 arranged downstream the water-purifying agent immersion device; and an irrigation tube 4 arranged downstream the opening / closing valves.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a water purification facility and a water purification method that can be used for irrigation or fertilization for crop cultivation. [Background technology]

[0002] There are various known cultivation methods for crops, such as the "soil culture method" which uses soil as a medium, the "solid medium culture method" in which crops are planted in various mediums that replace soil, the "hydroponic method" in which roots are grown in or on the surface of a nutrient solution without using a medium, and the "spray culture method" in which a nutrient solution is sprayed onto the roots in a mist. Among these cultivation methods, the nutrient solution culture method, in which nutrients are supplied along with water, is widely used.

[0003] Hydroponic culture is a method that does not rely on basal fertilizer, but instead manages the amount of irrigation and fertilizer supply (fertilization) according to the stage and condition of the crop, and supplies the crop with just the right amount of fertilizer. Irrigation and fertilization are usually carried out by irrigating and applying inorganic fertilizer (liquid fertilizer) in a solution to the root zone of the crop through irrigation tubes.

[0004] In recent years, due to growing awareness of food safety and the environment, interest in organic fertilizers, which are considered to be environmentally friendly, and the need for crops grown using organic fertilizers are increasing among consumers, and there is a demand for cultivation using organic fertilizers in hydroponic culture methods.

[0005] However, when organic fertilizer is used in hydroponic culture, a viscous substance forms in the irrigation tubes (especially the outlet holes), causing clogging of the outlet holes, which leads to inaccurate irrigation and fertilization, resulting in poor crop growth. The cause of clogging is the formation of a viscous substance in the irrigation tubes. The viscous substance is organic matter derived from organic fertilizer, and is sometimes referred to as biofilm, slime, etc. A biofilm is a collection of microorganisms formed by the attachment of bacteria, mold, etc. to a solid surface, and is the growth of colonies formed by extracellular polysaccharides (EPS) secreted by the microorganisms.

[0006] Furthermore, in hydroponic cultivation, if the groundwater, well water, agricultural water, or other raw water used contains bacteria, viruses, mold, or the like that cause crop diseases, the disease can be caused in the crops, resulting in poor growth.

[0007] Therefore, for example, Patent Document 1 reports a technology using a cleaning agent for irrigation tubes containing peroxodisulfate and hydroxycarboxylic acid in a nutrient solution culture system or a hydroponic culture system. Patent Document 1 also reports a nutrient solution culture system 500 shown in FIG. 7. The nutrient solution culture system 500 includes a raw water pump 501 that supplies raw water to the system, a raw water filter 502 that removes foreign matter from the supplied raw water, a tank 503 that stores a concentrated fertilizer concentrate, a liquid fertilizer mixer 504 that mixes the concentrated fertilizer concentrate in the tank with the raw water, an on-off valve 505 located downstream of the liquid fertilizer mixer, and irrigation tubes 510 located downstream of the on-off valve. Patent Document 1 discloses that the cleaning agent is used in the form of an aqueous solution, and the cleaning agent is supplied to the concentrated fertilizer concentrate tank 503 or to a separately provided container such as a bucket, and is subsequently mixed with the raw water by the liquid fertilizer mixer 504.

[0008] Furthermore, for example, Patent Document 2 reports an agent for preventing clogging of irrigation tubes containing a polyamine or a salt thereof, which may be substituted with an alkyl group or a hydroxyalkyl group. Patent Document 2 discloses that the agent for preventing clogging of irrigation tubes is used in the form of an aqueous solution.

[0009] Furthermore, for example, Patent Document 3 reports an apparatus for adding silver ions to a nutrient solution for soil culture of plants so that the concentration is 0.0005 mg / L or more and 0.025 mg / L or less in soil culture of plants. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-217919 [Patent Document 2] Patent Publication No. 2021-107314 [Patent Document 3] Japanese Patent Publication No. 2022-35377 Summary of the Invention [Problem to be solved by the invention]

[0011] However, the techniques of Patent Documents 1 and 2 were not effective enough in preventing clogging of the irrigation tubes and purifying the raw water. The technology of Patent Document 3 requires the installation of a separate precision device that quantitatively adds an aqueous solution containing silver ions at a predetermined concentration to the nutrient solution in order to achieve the desired effect, which results in higher installation costs and requires a lot of maintenance work.

[0012] Therefore, the use of a chlorine-based water purification agent is considered. It is known that chlorine-based water purification agents have sufficient effects of preventing clogging of irrigation tubes and purifying raw water. However, in conventional systems, the chlorine-based water purification agent is supplied in the form of an aqueous solution to concentrated fertilizer concentrate tank 503 or to a separately prepared container such as a bucket, and is then mixed with raw water by liquid fertilizer mixer 504, as shown in FIG. 7, for example. In the system shown in FIG. 7, when the chlorine-based water purification agent is supplied from concentrated fertilizer concentrate tank 503, the concentrated fertilizer concentrate and the chlorine-based water purification agent are mixed in concentrated fertilizer concentrate tank 503. However, when these are mixed, the component (chlorine) of the chlorine-based water purification agent reacts with the concentrated fertilizer concentrate and is consumed, which creates a new problem in that the chlorine-based water purification agent's effects of preventing clogging of irrigation tubes and purifying raw water are not sufficiently achieved. Furthermore, when an aqueous solution of a chlorine-based water purification agent is supplied to a separately prepared container such as a bucket and mixed using the liquid fertilizer mixer 504, the components of the chlorine-based water purification agent are gradually consumed while the chlorine-based water purification agent is in aqueous solution, which creates a new problem: the chlorine-based water purification agent's effects of preventing clogging in irrigation tubes and purifying raw water cannot be achieved over the long term. Furthermore, because the liquid fertilizer mixer 504 is placed in a closed system from the raw water pump 501 to the on-off valve 505, the liquid fertilizer mixer 504 is usually equipped with a mixing pump (not shown) for mixing while applying pressure. Therefore, mixing the aqueous solution of a chlorine-based water purification agent using the liquid fertilizer mixer 504 creates a new problem: the metal parts that make up the mixing pump of the liquid fertilizer mixer 504 are corroded by chlorine.

[0013] For this reason, as shown in Figure 8, it is conceivable to place a chlorine-based water purification agent supply device 506 downstream of the closed system from the raw water pump 501 to the on-off valve 505. In this system 501, the chlorine-based water purification agent supply device 506 is placed in an open system (atmospheric pressure system), so a mixing pump required for mixing into the closed system is not required. However, in such a system 501, it is necessary to place the supply device 506 downstream of each on-off valve 505, which creates a new problem of higher costs for placing the chlorine-based water purification agent supply device 506. Furthermore, it does not solve the above-mentioned problem that the components of the chlorine-based water purification agent are gradually consumed when the chlorine-based water purification agent is in the form of an aqueous solution.

[0014] The present invention aims to provide a water purification facility and a water purification method that not only has a more effective effect in preventing clogging of irrigation tubes and purifying raw water, but also does not require a mixing pump for mixing water purification agents with raw water, and does not require a mixing device for mixing water purification agents with raw water to be placed downstream of each of the opening and closing valves.

[0015] The present invention also aims to provide water purification equipment and a water purification method that not only have a more effective effect in preventing clogging of irrigation tubes and purifying raw water, but also do not require a mixing pump for mixing water purification agents into raw water, do not require mixing devices for mixing water purification agents into raw water to be placed downstream of each of the on-off valves, do not require precision equipment for quantitative addition, and are more easily maintained and managed. [Means for solving the problem]

[0016] The present invention provides A raw water purification facility, a raw water supply means for supplying raw water into the water purification facility; a water purification agent soaking device disposed downstream of the raw water feeding means and configured to soak a solid water purification agent in the raw water; an on-off valve disposed downstream of the water purification agent soaking device; and The present invention relates to a water purification facility comprising an irrigation tube arranged downstream of the on-off valve.

[0017] The present invention also provides A method for purifying raw water using the above water purification equipment, an immersion step of immersing the water purification agent in raw water; A stopping step of stopping the flow of raw water to the water purification agent soaking device; and a release step of releasing the stop of the flow of raw water to the water purification agent soaking device. [Effects of the Invention]

[0018] The water purification equipment and water purification method of the present invention are more effective in preventing clogging of the irrigation tubes and purifying raw water. The water purification equipment and method of the present invention also do not require a mixing pump for mixing the water purification agent with the raw water, and do not require a mixing device for mixing the water purification agent with the raw water to be located downstream of each of the on-off valves. The water purification system and method of the present invention also do not require precision equipment for quantitative addition, and are much easier to maintain. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic diagram showing an embodiment of the water purification system and water purification method of the present invention. [Figure 2] FIG. 1 is a schematic diagram of an example of a water purification agent soaking device included in the water purification equipment of the present invention, and is a partial cross-sectional schematic diagram viewed along the horizontal direction. [Figure 3A] FIG. 2 is a schematic front view of the immersion device main body member. [Figure 3B] FIG. 2 is a schematic top view of the immersion device main body member. [Figure 3C] FIG. 2 is a schematic side view of the immersion device main body member. [Figure 4A] FIG. 2 is a schematic front view of a cap member. [Figure 4B] FIG. 2 is a schematic top view of a cap member. [Figure 4C] FIG. 2 is a schematic bottom view of the cap member. [Figure 5A] FIG. 2 is a schematic front view of a cartridge holding member. [Figure 5B] FIG. 2 is a schematic perspective view of a cartridge holding member. [Figure 5C] FIG. 2 is a schematic top view of a cartridge holding member. [Figure 5D] FIG. 2 is a schematic bottom view of a cartridge holding member. [Figure 6A] FIG. 2 is a schematic front view of a cartridge member. [Figure 6B] FIG. 2 is a schematic top view of a cartridge member. [Figure 6C] FIG. 2 is a schematic bottom view of a cartridge member. [Figure 6D] FIG. 2 is a schematic top view of a cartridge packing. [Figure 7] FIG. 1 is a schematic diagram showing an embodiment of a conventional water purification facility and water purification method. [Figure 8] FIG. 1 is a schematic diagram showing another embodiment of a conventional water purification facility and water purification method. DETAILED DESCRIPTION OF THE INVENTION

[0020] The water purification system and water purification method of the present invention will be described below. Note that the water purification system and the water purification agent soaking device of the water purification system of the present invention are not limited to the following configurations and may be modified as appropriate within the scope of the present invention. In addition, a combination of multiple individual preferred configurations described below also constitutes the present invention.

[0021] In this specification, terms indicating the relationship between elements (e.g., "parallel," "orthogonal," "vertical," etc.) and terms indicating the shape of elements do not only mean the strict literal form, but also mean a range of substantial equivalence, for example, a range including a difference of about a few percent. In this specification, the direction in which raw water flows is sometimes referred to as the "horizontal direction," but the flow direction F of raw water does not have to be strictly "horizontal"; for example, a direction inclined enough to allow raw water to be fed from a raw water supply means also falls within the category of "horizontal direction." Furthermore, the direction perpendicular to such a "horizontal direction" may be referred to as the "vertical direction."

[0022] As used herein, a "front view" refers to the state of an object in the water purification system of the present invention when viewed horizontally (front view). A "top view" refers to the state of an object when viewed vertically from above (top view). A "bottom view" refers to the state of an object when viewed vertically from below (bottom view or bottom view). A "side view" refers to the state of an object when viewed from the right or left side of the "front view" (side view). A "cross-sectional view" refers to the cross-sectional state of an object when viewed perpendicular to the vertical direction (cross-sectional view). The terms "upper-lower direction" and "left-right direction" used directly or indirectly in this specification correspond to the upper-lower direction and left-right direction in the drawings, respectively. Unless otherwise specified, the same symbols or symbols refer to the same components or parts or have the same meaning. In a preferred embodiment, the vertical downward direction (i.e., the direction in which gravity acts) can be considered to correspond to the "downward direction," and the opposite direction can be considered to correspond to the "upward direction."

[0023] The drawings shown below are schematic diagrams, and the dimensions, aspect ratio, scale, etc. may differ from those of the actual product.

[0024] An embodiment of a water purification system and a water purification method according to the present invention will be described with reference to Figures 1 to 6D. Note that the shape and arrangement of the water purification agent soaking device and its components are not limited to the examples shown in the drawings.

[0025] The water purification system and water purification method of the present invention are, respectively, a water purification system and a water purification method for raw water, and are typically used for "irrigation" or "fertilization." In this specification, "irrigation" refers to the application of water to crops. "Fertilization" refers to the application of nutrients to crops. "Irrigation" does not only mean the application of water, but may also include the concept of "fertilization," which applies nutrients. Therefore, the water purification system of the present invention may be referred to as an "irrigation system" or a "fertilization system." The water purification method of the present invention may also be referred to as an "irrigation method" or a "fertilization method." Furthermore, the water purification system, irrigation system, and fertilization system of the present invention may also be referred to as a "water purification system," an "irrigation system," and a "fertilization system," respectively. "Crops" may be any crops that have been conventionally cultivated, such as vegetables, fruit trees, flowers, and ornamental plants.

[0026] The water purification equipment and water purification method according to the present invention have the effect of purifying raw water by the purifying agent, and based on the effect of purifying raw water, also have the effect of preventing clogging of the irrigation tubes.

[0027] [Water purification facilities] The water purification equipment 10 according to the present invention includes, for example, as shown in FIG. raw water supply means 1 for supplying raw water into the water purification facility; a water purification agent soaking device 2 disposed downstream of the raw water feeding means 1 and configured to soak a solid water purification agent in the raw water; an on-off valve 3 disposed downstream of the water purification agent soaking device 2; and an irrigation tube 4 disposed downstream of the on-off valve; FIG. 1 is a schematic diagram showing an embodiment of the water purification system and water purification method of the present invention.

[0028] The components, parts, means, and devices (hereinafter, sometimes referred to as "components, etc.") that constitute the water purification system 10 of the present invention are described in detail below. The water purification system 10 of the present invention has a sealed system between the raw water supply means 1 and the on-off valve 3. The phrase "water purification system 10 has a sealed system between the raw water supply means 1 and the on-off valve 3" means that the state within the system from the raw water supply means 1 to the on-off valve 3 can be maintained in a sealed state by opening and closing the raw water supply means 1 and the on-off valve 3. For example, by opening the raw water supply means 1 and closing the on-off valve 3, and then closing the raw water supply means 1 and closing the on-off valve 3, the system from the raw water supply means 1 to the on-off valve 3 can be maintained in a sealed state while maintaining the water pressure applied by the raw water supply means 1. On the other hand, by opening the raw water supply means 1 and opening the on-off valve 3, raw water is supplied to crops via the irrigation tubes. On the other hand, when the raw water supply means 1 is "closed," the supply of raw water is stopped whether the on-off valve 3 is "open" or "closed." Note that "sealed" does not strictly mean "no gaps." For example, even if the raw water supply means 1 is "open" and the on-off valve 3 is "open," and then the raw water supply means 1 is "closed" and the on-off valve 3 is "closed," the structure means that there are no components that would cause raw water leakage due to an increase in water pressure. If the raw water supply means 1 and the on-off valve 3 are subsequently maintained in the "closed" state, the water pressure may decrease.

[0029] (Raw water supply means) The raw water supply means 1 is not particularly limited as long as it can supply raw water into the water purification system 10. The raw water supply means 1 may typically be a pump (particularly an electric pump), an air lift pump, supply from a water tap of a field irrigation facility, supply from a water storage tank, etc. The raw water may be groundwater, well water, river water, agricultural water, etc. The water pressure of the raw water imparted by the raw water supply means may be, for example, 1.0 MPa, which is the maximum water pressure standard for water supply piping, or a value lower than this.

[0030] The raw water supply means 1 is normally operated by an operation based on "open" or "close." Specifically, by turning the raw water supply means 1 "open" or "closed," the supply of raw water to the water purification facility is "started" or "stopped," respectively.

[0031] (Water purification agent soaking device) The water purification agent soaking device 2 is connected and disposed downstream of the raw water supply means 1, and soaks and dissolves a solid water purification agent in the raw water. In this specification, "connection" is usually achieved by piping. "Piping" means a conduit for conducting raw water or the arrangement thereof. The conduit may be any pipe capable of conducting raw water, and may be, for example, a pipe made of plastic (particularly polyvinyl chloride) or metal. The dimensions and cross-sectional shape of the conduit may be determined according to the scale of irrigation or fertilization, and may be, for example, an inner diameter of 5 to 200 mm (particularly 20 to 120 mm (e.g., 50, 75, or 100 mm, particularly 50 mm)) and may be circular.

[0032] The water purification agent soaking device 2 is connected in series between the raw water supply means 1 and an on-off valve 3, which will be described later. Connecting the water purification agent soaking device 2 in series between the raw water supply means 1 and the on-off valve 3 means that the water purification agent soaking device 2 is connected via the shortest path between the raw water supply means 1 and the on-off valve 3. For example, the water purification agent soaking device 2 may be connected directly to the on-off valve 3, or, as shown in FIG. 1 , may be connected indirectly to the on-off valve 3 via a raw water filter 15 and a liquid fertilizer mixer 17, which will be described later.

[0033] The water purification agent soaking device 2 is preferably a sealed system. This is because if the water purification agent soaking device 2 were an open system, there is a possibility that raw water would leak from the device due to water pressure. The water purification agent soaking device 2 being a sealed system means that it has a sealed structure that can maintain a sealed system between the raw water supply means 1 and the on-off valve 3. For example, even if the raw water supply means 1 is "open" and the on-off valve 3 is "closed," the water purification agent soaking device 2 has a sealed structure that can prevent leakage of raw water.

[0034] As shown in Fig. 2, the water purification agent soaking device 2 includes a soaking device main body member 21, a cap member 22, a cartridge member 23, and a cartridge holder member 24. Fig. 2 is a schematic diagram of an example of a water purification agent soaking device included in the water purification facility of the present invention, and is a partial cross-sectional schematic diagram viewed horizontally. More specifically, it is a partial cross-sectional schematic diagram showing only the soaking device main body member 21 and the cap member 22 in a cross-sectional view of the water purification agent soaking device 2 viewed horizontally.

[0035] As shown in Figures 2 and 3A-3C, the immersion device main body member 21 includes a raw water flow path portion 211 that conducts raw water horizontally and a water purification agent storage portion 212 that extends vertically and stores a water purification agent therein. Regarding the water purification agent storage portion 212, "storing a water purification agent therein" does not mean that the water purification agent is directly stored therein, but rather that, as will be described later, a cartridge holding member 24 that holds a cartridge member 23 filled with a water purification agent is stored therein. Figure 3A is a schematic front view of the immersion device main body member 21. Figure 3B is a schematic top view of the immersion device main body member 21. Figure 3C is a schematic side view of the immersion device main body member 21. As the immersion device main body member 21 includes a raw water flow path portion 211 extending horizontally and a water purification agent storage portion 212 extending vertically (Figures 2 and 3A), the appearance of the water purification agent immersion device 2 can be described as having an inverted T-shape.

[0036] One end of the raw water flow path portion 211 is connected to the piping on the raw water supply means 1 side, and the other end is connected to the piping on the on-off valve 3 side. This achieves a serial connection of the water purification agent soaking device 2 between the raw water supply means 1 and the on-off valve 3.

[0037] The water purification agent-containing portion 212 is usually provided at its upper end with a connecting means (e.g., a screw structure) 213 for detachably and hermetically connecting with the lower end of the cap member 22 described below. In Figures 2 and 3A to 3C, the water purification agent-containing portion 212 has a male screw structure 2130 as the connecting means 213 at its upper end, but this is not particularly limited as long as it can be hermetically connected (e.g., fitted) with the connecting means 221 of the cap member 22, and for example, it may have a female screw structure.

[0038] The dimensions of the water purification agent accommodating portion 212 are not particularly limited as long as they can accommodate the barrel holding member 24 holding the barrel member 23 described below. The inner diameter R1 (see FIG. 3B) of the water purification agent accommodating portion 212 may be, for example, 5 to 200 mm, particularly 20 to 100 mm (e.g., 50 mm). The total length L1 (see FIG. 2) of the water purification agent accommodating portion 212 is not particularly limited as long as the total length L0, including the cap length L2 of the cap member 22 described below, is sufficiently longer than the installation height L3 of the barrel holding member 24 holding the barrel member 23. For example, when the total length of the barrel member 23 is H (mm) (see FIG. 6A), the total length L0 may be 1.1×H to 2.0×H (mm), particularly 1.1×H to 1.5×H (mm). For example, when the total length of barrel member 23 is H (mm) (see FIG. 6A), total length L1 may be 0.5×H to 1.2×H (mm), particularly 0.7×H to 1.0×H (mm).

[0039] The dimensions of the raw water flow path section 211 are not particularly limited as long as irrigation or fertilization can be achieved by the water purification system of the present invention, and may be determined according to the scale of irrigation or fertilization. The inner diameter R2 (see FIG. 3C) of the raw water flow path section 211 may be, for example, 5 to 200 mm, particularly 20 to 100 mm (e.g., 50 mm). The overall length K1 of the raw water flow path section 211 is not particularly limited as long as piping connections can be achieved on the upstream and downstream sides of the water purification agent soaking device 2 (see FIG. 2). The overall length K1 may be, for example, 0.3×H to 1.2×H (mm), particularly 0.5×H to 1.0×H (mm), where H (mm) is the overall length of the cartridge member 23 (see FIG. 6A).

[0040] The thickness of the water purification agent containing portion 212 and the raw water channel portion 211 is not particularly limited as long as they can withstand water pressure, and may be, for example, 1 to 20 mm, particularly 2 to 10 mm (eg, 5 mm) each independently.

[0041] The immersion device main body member 21 (the water purification agent storage portion 212 and the raw water flow path portion 211) may be made of any material as long as it can withstand the water pressure of the raw water, and may be made of, for example, plastic (especially polyvinyl chloride) or metal.

[0042] The cap member 22 seals an opening 2121 (see FIGS. 3B and 3C) at the upper end of the water purification agent-containing portion 212. The cap member 22 is usually provided at its lower end with a connecting means (e.g., a screw structure) for detachably and sealingly connecting to the upper end of the water purification agent-containing portion 212. In FIGS. 2 and 4A to 4C, the cap member 22 has a female screw structure 2210 as the connecting means 221 at its lower end, but this is not particularly limited as long as it can be sealed and connected (e.g., fitted) to the connecting means 213 of the water purification agent-containing portion 212, and may, for example, have a male screw structure. FIG. 4A is a schematic front view of the cap member 22. FIG. 4B is a schematic top view of the cap member 22. FIG. 4C is a schematic bottom view of the cap member 22.

[0043] Since the water purification agent soaking device 2 (particularly the water purification agent storage portion 212) has a cap member 22, the water purification agent soaking device 2 can be made into a sealed system, and as a result, it is possible to create a sealed structure between the raw water supply means 1 and the on-off valve 3.

[0044] The dimensions of cap member 22 are not particularly limited as long as a medicine barrel holding member 24 holding a medicine barrel member 23 (described later) can be accommodated in water purification agent storage portion 212 to which cap member 22 is connected. Cap member 22's inner diameter R3 (see FIG. 4C) may be, for example, 5 to 200 mm, particularly 20 to 100 mm (e.g., 50 mm). Cap member 22's cap length L2 is the total length L4 of cap member 22 minus the coupling length L5 of coupling means 221 (see FIG. 2). For example, when the total length of medicine barrel member 23 is H (mm) (see FIG. 6A), coupling length L5 may be 0.1×H to 1.0×H (mm), particularly 0.2×H to 0.5×H (mm). Coupling length L5 is not particularly limited as long as a tightly sealed coupling is achieved, and may be, for example, 5 to 50 mm, particularly 5 to 20 mm (e.g., 10 mm).

[0045] The cap member 22 may be made of any material as long as it can prevent leakage of raw water, and may be made of, for example, plastic (particularly polyvinyl chloride) or metal.

[0046] As shown in FIGS. 2 and 6A-6C, the cartridge member 23 has a cylindrical shape and is filled or placed inside with a solid water purification agent 231. The cartridge member 23 filled or placed with the water purification agent 231 is held by a cartridge holder 24 and placed inside the water purification agent storage section 212. The water purification agent immersion device 2 includes the cartridge member 23, allowing the solid water purification agent 231 to be filled into the cartridge member 23, ensuring a constant amount of the water purification agent 231 coming into contact with the flowing raw water. This allows the amount of water purification agent component in the flowing raw water to be constant. Another advantage is that when the water purification agent 231 dissolves at the bottom of the cartridge member 23, gravity moves new water purification agent 231 from the top to the bottom and supplies it, thereby reducing the effort required to replenish the water purification agent. FIG. 6A is a schematic front view of the cartridge member 23. FIG. 6B is a schematic top view of the cartridge member 23. FIG. 6C is a schematic bottom view of the cartridge member 23. FIG.

[0047] As shown in Figures 2 and 6A-6C, the cartridge member 23 has an opening 230 at its lower and / or bottom, allowing contact between the flow of raw water and the water purification agent. Specifically, raw water flowing through the purification agent soaking device 2 (particularly its raw water flow path portion 211) comes into contact with the water purification agent 231 via the opening 230 at the lower and / or bottom of the cartridge member 23, causing components to dissolve from the water purification agent 231, neutralizing bacteria, viruses, mold, etc. contained in the raw water and purifying the raw water. While cartridge member 23 has opening 230a at its lower part and opening 230b at its bottom in Figures 2 and 6A-6C, this is not limited as long as contact between the raw water and the water purification agent is ensured, and the opening 230 may be at either the lower or bottom.

[0048] As shown in Fig. 2 and Figs. 6A to 6D, barrel member 23 has barrel packing 232 attached or installed on its outer surface for fixing or hanging barrel member 23. Barrel packing 232 is a ring-shaped elastic body and has an inner diameter R5 (see Fig. 6D) that is smaller than the outer diameter R4 (see Fig. 6A) of barrel member 23, and therefore is fixed to barrel member 23 by being attached to barrel member 23. Therefore, by accommodating barrel member 23, which is filled with water purification agent 231 inside and has barrel packing 232 attached to its outer surface, in barrel holding member 24 described later as shown in Fig. 2, barrel member 23 can be held hanging within barrel holding member 24 by barrel packing 232. At this time, the cartridge packing 232 fixed to the cartridge member 23 holds the cartridge member 23 while its lower surface 2320 (FIGS. 6A and 6C) is supported by the upper end surface 240 (see FIGS. 2 and 5C) of the cartridge holding member 24. Because the cartridge packing 232 holds the cartridge member 23 in a hanging state, the cartridge member 23 can be easily rotated clockwise (or counterclockwise) around the axis of the cartridge member in a top view at any angle. Once rotated and installed at a desired angle, the cartridge member 23 will not be further rotated by the flow of raw water. Therefore, by adjusting the rotation angle, the flow rate of the raw water at the opening 230 of the cartridge member 23 can be adjusted. As a result, the dissolution rate of the water purification agent can be controlled, and the concentration of the water purification agent 231 in the raw water can be controlled while the raw water is flowing. FIG. 6D is a schematic top view of the cartridge packing 232.

[0049] The cartridge packing 232 is made of an elastic material and is movable in the overall length H direction (see FIG. 6A ) by an external force, so that the installation height of the cartridge member 23 can be changed by the cartridge packing 232. Specifically, by adjusting the attachment position of the cartridge packing 232 on the cartridge member 23, the installation height of the cartridge member 23 relative to the cartridge holding member 24 can be controlled. As a result, by adjusting the amount of the water purification agent 231 that comes into contact with the flow of raw water, the amount of eluted components of the water purification agent 231 in the raw water while the raw water is flowing can be adjusted to a desired concentration. More specifically, in FIG. 6A , by attaching the cartridge packing 232 on the cartridge member 23 further upward, the installation height of the cartridge member 23 relative to the cartridge holding member 24 can be lowered, and the amount of contact between the flow of raw water and the water purification agent 231 can be increased. 6A, by lowering the attachment position of the cartridge packing 232 in the cartridge member 23, the relative installation height of the cartridge member 23 with respect to the cartridge holding member 24 can be increased, thereby reducing the amount of contact between the flow of raw water and the water purification agent 231. In this way, the water purification agent immersion device 2 included in the water purification equipment of the present invention can adjust and maintain the concentration of the water purification agent 231 in the raw water while the raw water is flowing by changing the attachment position of the cartridge packing 232 and the installation height of the cartridge member 23, thereby achieving the following additional advantages: There is no need to install an adjustment device for controlling the concentration of the water purification agent, a measurement device for measuring the concentration of the water purification agent, or an adjustment device for controlling the amount of water purification agent supplied. The cost of installing the purification equipment is low, and maintenance is easy.

[0050] The water purification agent 231 is filled or placed inside the barrel member 23 while maintaining a solid state. Of the water purification agents 231 filled inside the barrel member 23, the water purification agent 231 placed in the lower part or bottom of the barrel member 23 is dissolved or consumed by contact with the raw water.

[0051] The water purification agent 231 is not particularly limited, but is preferably a halogen-based solid water purification agent from the viewpoint of detoxifying bacteria, viruses, mold, etc. contained in the raw water. A halogen-based solid water purification agent is a water purification agent that, by virtue of the halogen contained therein, has the effect of preventing clogging of irrigation tubes and / or inactivating bacteria, viruses, mold, etc. contained in the raw water. The halogen-based solid water purification agent may be any solid water purification agent that contains a halogen element and has such an effect. From the viewpoint of enhancing the water purification effect and the solubility of the components, the halogen-based solid water purification agent is preferably one or more chlorine-based solid water purification agents selected from the group consisting of trichloroisocyanuric acid, metal salts of dichloroisocyanuric acid, hydrates of metal salts of dichloroisocyanuric acid, dichlorohydantoin, chlorobromohydantoin, calcium hypochlorite, crystallized sodium hypochlorite, and mixtures thereof. As a commercially available halogen-based solid water purification agent (particularly a chlorine-based solid water purification agent), for example, Agrichlor T (manufactured by Shikoku Chemicals Corporation) is available.

[0052] The form or shape of the water purification agent 231 is not particularly limited as long as it is in a solid state before contact with the raw water, and it may be, for example, a tablet, a powder, granules, or a mixture thereof. The water purification agent 231 is preferably a tablet from the viewpoints of ease of installation in the cartridge member, prevention of the water purification agent itself being washed away by the flow of raw water, and adjustment of the amount of water purification agent dissolved in the raw water. By using tablets as the water purification agent 231 as shown in FIGS. 2 and 6A, the water purification agents can be stacked and set. When the water purification agent 231 dissolves at the bottom of the cartridge member 23, gravity (or its own weight) allows the new water purification agent 231 at the top to move more effectively to the bottom.

[0053] When the water purification agent 231 is a tablet, the size of the tablet is not particularly limited as long as it can be filled or placed inside the medicine barrel member 23. The diameter of the tablet is not particularly limited and may be, for example, 7 to 89 mm, particularly 9 to 39 mm (e.g., 30 mm). The thickness of the tablet is not particularly limited and may be, for example, 5 to 50 mm, particularly 8 to 30 mm (e.g., 13 mm).

[0054] The cartridge member 23 has an opening at its upper end for supplying and replenishing the water purification agent 231, and therefore usually has a cartridge cap 233 for covering the opening.

[0055] The dimensions of the barrel member 23 are not particularly limited as long as the water purification agent 231 can be filled or placed inside. The outer diameter R4 (see FIG. 6A) of the barrel member 23 may be, for example, 10 to 100 mm, particularly 20 to 50 mm (e.g., 39 mm). The inner diameter (not shown) of the barrel member 23 is not particularly limited and may be, for example, 8 to 90 mm, particularly 10 to 40 mm (e.g., 38 mm). The overall length H (see FIG. 2) of the barrel member 23 is not particularly limited and may be, for example, 100 to 500 mm, particularly 200 to 400 mm (e.g., 270 mm).

[0056] The dimensions of openings 230a and 230b located at the lower and bottom portions of barrel member 23 are not particularly limited as long as water purification agent 231 is accommodated within barrel member 23 and contacts raw water entering through the openings. While barrel member 23 is shown in FIGS. 2 and 6A-6D as always having openings 230a and 230b of constant dimensions, this is not limiting. For example, barrel member 23 may have an accessory (or a separate component) that allows the width of at least one of openings 230a and 230b to be adjusted by the accessory.

[0057] The height h1 (see FIG. 6A) of opening 230a may be, for example, 5 to 100 mm, particularly 20 to 50 mm (e.g., 25 mm). The width w1 (see FIG. 6A) of opening 230a may be, for example, 0.10×R4 to 0.45×R4 (mm), particularly 0.20×R4 to 0.40×R4 (mm), where R4 (mm) is the outer diameter of barrel member 23 (see FIG. 6A), and may be specifically 5 to 30 mm, particularly 10 to 20 mm (e.g., 15 mm). The width w2 (see FIG. 6C) of the opening 230b may be, for example, 0.10×R4 to 0.45×R4 (mm), particularly 0.20×R4 to 0.40×R4 (mm), when the outer diameter of the cartridge member 23 is R4 (mm) (see FIG. 6A), and may be specifically 5 to 30 mm, particularly 10 to 20 mm (e.g., 15 mm).

[0058] The inner diameter R5 (mm) (see FIG. 6D) of the cartridge barrel packing 232 is not particularly limited as long as the cartridge barrel packing 232 can be attached to the outer surface of the cartridge barrel member 23 and can be moved by an external force in the direction of the total length H. For example, when the outer diameter of the cartridge barrel member 23 is R4, the inner diameter R5 (mm) may be a value such that the value of "R4 - R5" is 0.1 to 10 mm, particularly 0.5 to 5 mm (for example, 2 mm).

[0059] The constituent materials of the barrel member 23 and the barrel cap 233 are not particularly limited as long as they can accommodate the water purification agent. The barrel member 23 and the barrel cap 233 are preferably made of a transparent material so that the consumption of the water purification agent 231 inside can be visually confirmed. Examples of such transparent materials include plastics such as polyvinyl chloride (PVC), polyethylene terephthalate (PET), and polypropylene (PP).

[0060] The material constituting the cartridge packing 232 is not particularly limited as long as it has elasticity, and examples thereof include ethylene propylene rubber (EPDM), vinylidene fluoride fluororubber (FKM), etc. From the viewpoint of resistance to chlorine, ethylene propylene rubber (EPDM) or vinylidene fluoride fluororubber (FKM) is desirable.

[0061] As shown in FIGS. 2 and 5A to 5D, the barrel holding member 24 holds the barrel member 23 (particularly, the barrel packing 232 fixed to the barrel member 23) at its upper end surface 240. As a result, the barrel holding member 24 holds the barrel member 23 in a hanging state inside by its upper end surface 240 and the barrel packing 232. The barrel holding member 24 has a cylindrical shape and houses the barrel member 23 therein. The barrel holding member 24 has a guide window 241 at its lower part for guiding the raw water flow to the barrel member 23 (particularly, the water purification agent 231 therein). The guide window 241 has a rectangular shape when viewed from the front (e.g., FIGS. 2 and 5A) and forms a notch from the bottom of the barrel holding member 24, but is not limited thereto and may have, for example, a semicircular or circular shape. FIG. 5A is a schematic front view of the cartridge holding member 24. FIG. 5B is a schematic perspective view of the cartridge holding member 24. FIG. 5C is a schematic top view of the cartridge holding member 24. FIG. 5D is a schematic bottom view of the cartridge holding member 24. Although the cartridge holding member 24 is in contact with the inner wall of the raw water flow path portion 211 of the immersion device main body member 21 at its bottom, the cartridge holding member 24 is depicted in FIG. 2 as if floating from the inner wall of the raw water flow path portion 211, as indicated by the apparent floating portion Y. This phenomenon is based on the fact that the cartridge holding member 24 and the raw water flow path portion 211 both have a cylindrical shape, as is clear from the top view shape of FIG. 5C and the side view shape of FIG. 3C.

[0062] The guide window 241 is positioned in the horizontal plane of FIG. 2 (the plane direction, including the front and back directions on the paper of FIG. 2 ), so as to open perpendicular to the raw water flow direction F of the raw water flow path portion 211, but is not limited thereto. Specifically, when viewed from above, the cartridge holder 24 can be easily rotated clockwise (or counterclockwise) around its axis at any angle. At this time, the cartridge holder 24 may rotate together with the cartridge member 23 held by the cartridge holder 24, or may rotate independently of the cartridge member 23. Once rotated and installed at a desired angle, the cartridge holder 24 will not further rotate due to the flow of raw water. Therefore, by adjusting the rotation angle, the flow rate of the raw water at the opening 230 of the cartridge member 23 can be adjusted. As a result, the dissolution rate of the water purification agent can be controlled, and the concentration of the water purification agent 231 in the raw water while the raw water is flowing can be controlled. For example, using the state shown in FIG. 2 as a reference, the barrel holding member 24 may be rotated 90° clockwise (or counterclockwise) around the axis of the barrel holding member in a top view to position the guide window 241 so that it opens toward the raw water flow direction F. Positioning the guide window 241 so that it opens toward the raw water flow direction F allows the raw water to flow in such a way that it directly contacts the barrel member 23 (or the water purification agent 231 therein) in the flow direction F. This increases the flow rate of the raw water at the time of contact, further increasing the dissolution rate of the water purification agent, and maintaining a higher and more constant concentration of the water purification agent 231 in the raw water while the raw water is flowing. Therefore, the following effects described above can be more effectively achieved. There is no need to install an adjusting device for controlling the concentration of the water purification agent, a measuring device for measuring the concentration of the water purification agent, or an adjusting device for controlling the amount of water purification agent supplied. The cost of installing the purification equipment is low, and maintenance is easy.

[0063] The dimensions of the guide window 241 are not particularly limited as long as contact between the raw water guided through the guide window 241 and the water purification agent 231 is achieved. The height m1 (see FIG. 5A) of the guide window 241 may be, for example, 10 to 100 mm, particularly 30 to 70 mm (e.g., 50 mm). The width n1 (see FIG. 5A) of the guide window 241 may be, for example, 0.10×P to 0.90×P (mm), particularly 0.50×P to 0.70×P (mm), where P (mm) is the outer diameter of the cartridge holding member 24 (see FIG. 5A).

[0064] The outer diameter P (mm) of the barrel holding member 24 (see FIGS. 5A and 5C) is not particularly limited as long as the barrel holding member 24 can be housed in the water purification agent storage portion 212 of the water purification agent soaking device 2 and the barrel member 23 can be housed in the barrel holding member 24, and may be, for example, 10 to 100 mm, particularly 30 to 80 mm (e.g., 48 mm). When the inner diameter of the water purification agent storage portion 212 is R1, the outer diameter P (mm) may be a value such that the value of "R1 - P" is 0.1 to 10 mm, particularly 0.5 to 5 mm (e.g., 2 mm).

[0065] The inner diameter Q (mm) (see FIG. 5C) of the barrel holding member 24 is not particularly limited as long as the barrel member 23 can be housed within the barrel holding member 24, and may be, for example, 10 to 100 mm, particularly 20 to 60 mm (e.g., 42 mm). When the outer diameter of the barrel member 23 is R4, the inner diameter Q (mm) may be a value such that the value of "Q-R4" is 0.1 to 10 mm, particularly 0.5 to 5 mm (e.g., 2 mm).

[0066] The total length S (see FIG. 5A) of the cartridge holding member 24 is not particularly limited as long as it can maintain the cartridge member 23 held therein at an appropriate height and allow the water purification agent 231 to elute into the raw water. For example, when the total length of the cartridge member 23 is H (mm) (see FIG. 6A), the total length S may be 0.4×H to 1.2×H (mm), particularly 0.6×H to 0.8×H (mm).

[0067] The cartridge holding member 24 may be made of any material as long as it can hold the cartridge member 23, and may be made of, for example, plastic (particularly polyvinyl chloride) or metal.

[0068] (Shut-off valve) The on-off valve 3 is a component that allows raw water fed into the water purification facility to flow further downstream or blocks that flow. The movement pattern of the valve element that constitutes the on-off valve is not particularly limited. The on-off valve may be capable of adjusting the flow rate of raw water or the like in a stepwise or stepless manner. The on-off valve may be, for example, a solenoid valve.

[0069] The on-off valve 3 is normally operated by an operation based on "open" or "close." Specifically, by "opening" or "closing" the on-off valve 3, the supply of raw water further downstream is "started" or "stopped."

[0070] (Irrigation tube) The irrigation tube 4 may be any irrigation tube that belongs to agricultural materials and is used in so-called hydroponics or hydroponics. The irrigation tube is not particularly limited as long as it can transport raw water, etc. to the target area and release it, and may be, for example, a drip tube, a sprinkler tube, or a spray tube. The irrigation tube 4 may be either soft or hard. The material of the irrigation tube may usually be plastic. Specific examples of the material of the irrigation tube include polyvinyl chloride; polyolefins such as polyethylene and polypropylene, etc.

[0071] (raw water filter) The water purification system 10 of the present invention may further include a raw water filter 15 that removes foreign matter from the raw water. In FIG. 1 , the raw water filter 15 is connected and disposed between the water purification agent soaking device 2 and the on-off valve 3 (particularly the liquid fertilizer mixer 17 described below), but the location of the raw water filter 15 is not particularly limited. For example, the raw water filter 15 may be disposed between the raw water and the raw water supply means 1, between the raw water supply means 1 and the water purification agent soaking device 2, or between the liquid fertilizer mixer 17 and the on-off valve 3. When the raw water filter 15 is disposed downstream of the water purification agent soaking device 2, the formation of a biofilm on the raw water filter 15 can be suppressed.

[0072] (Liquid fertilizer tank and liquid fertilizer mixer) The water purification system 10 of the present invention may further include a liquid fertilizer tank 16 and a liquid fertilizer mixer 17 .

[0073] Liquid fertilizer tank 16 stores a concentrated fertilizer concentrate and is connected to liquid fertilizer mixer 17, supplying the concentrated fertilizer concentrate to liquid fertilizer mixer 17. The concentrated fertilizer concentrate contains a relatively high concentration of fertilizer that will become an appropriate concentration when mixed with raw water. The fertilizer may be any fertilizer used in the field of crop cultivation, for example, organic fertilizers; and inorganic fertilizers such as calcium nitrate, potassium nitrate, magnesium sulfate, potassium phosphate, ammonium sulfate, urea, sodium nitrate, calcium superphosphate, calcium triple superphosphate, potassium chloride, potassium sulfate, ammonium chloride, ammonium nitrate, ammonium dihydrogen phosphate, potassium carbonate, and potassium silicate.

[0074] Liquid fertilizer mixer 17 is connected in series between water purification agent soaking device 2 and on-off valve 3, and mixes the concentrated fertilizer concentrate supplied from liquid fertilizer tank 16 with raw water. Because liquid fertilizer mixer 17 is connected and arranged in series in a closed system from raw water supply means 1 to on-off valve 3, liquid fertilizer mixer 17 usually has a mixing pump (not shown) for mixing while applying pressure. Liquid fertilizer mixer 17 mixes the concentrated fertilizer concentrate supplied from liquid fertilizer tank 16 with raw water by the mixing pump.

[0075] (pressure reducing valve) The water purification system of the present invention may further include a pressure reducing valve (not shown). When the water purification system 10 of the present invention includes a pressure reducing valve, the location of the pressure reducing valve is not particularly limited as long as the pressure reducing valve is connected or disposed downstream of the raw water supply means 1. The pressure reducing valve may be disposed, for example, between the raw water supply means 1 and the water purification agent soaking device 2, between the water purification agent soaking device 2 and the raw water filter 15, between the raw water filter 15 and the liquid fertilizer mixer 17, or between the liquid fertilizer mixer 17 and the on-off valve 3.

[0076] [Purification method] The purification method according to the present invention is a method for purifying raw water using the above-mentioned water purification equipment, a soaking step of soaking the water purification agent 231 in raw water; a stopping step of stopping the flow of raw water to the water purification agent soaking device 2; and a release step of releasing the stoppage of the flow of raw water to the water purification agent soaking device 2.

[0077] The purification method according to the present invention can be carried out by using the water purification equipment according to the present invention described above. Therefore, the purification method according to the present invention can also be called a method of using the purification equipment according to the present invention.

[0078] (Soaking process) In this process, the purification agent 231 is typically placed in the purification agent soaking device 2, and then the purification agent 231 is soaked in raw water. Specifically, when placing the purification agent 231, the purification agent 231 is filled into the cartridge member 23 in the purification agent soaking device 2, and then the cartridge member 23 is inserted into the cartridge holder 24, and the cartridge member 23 is suspended within the cartridge holder 24 by the cartridge packing 232. At this time, it is preferable to cover the opening at the upper end of the cartridge member 23 with the cartridge cap 233. Next, while maintaining the cartridge member 23 suspended, the cartridge holder 24 is inserted or placed into the water purification agent storage portion 212. Then, by attaching the cap member 22, the water purification agent soaking device 2 can be made into a sealed system, and as a result, a sealed structure can be formed between the raw water supply means 1 and the on-off valve 3. Attaching the cap member 22 means joining the joining means 221 of the cap member 22 (particularly its lower end) to the joining means 213 of the water purification agent-containing portion 212 (particularly its upper end).

[0079] The immersion of the purifying agent 231 in raw water is achieved by opening the raw water supply means 1 and supplying raw water to the purifying agent immersion device 2. Once a sufficient amount of raw water for immersing the purifying agent 231 has been supplied to the purifying agent immersion device 2, the process proceeds to the next step, the stopping step.

[0080] (stop process) After the soaking process is completed, the raw water supply means and the on-off valve are typically closed to stop the flow of raw water to the water purification agent soaking device 2. Specifically, when irrigation is not being performed, the raw water supply means 1 is closed and the on-off valve 3 is closed. The flow of raw water through the water purification agent soaking device 2 is stopped, and the components of the water purification agent gradually dissolve into the raw water, resulting in a state in which the raw water in the water purification agent soaking device 2 contains a relatively high concentration of dissolved water purification agent components. At this time, the flow of raw water through the irrigation tubes 4 is also stopped, but no water purification agent is supplied to the irrigation tubes 4. Moreover, the water purification agent dissolved into the raw water in the irrigation tubes 4 is usually consumed over time. For these reasons, the inside of the irrigation tubes 4 is an environment conducive to the proliferation of bacteria, viruses, mold, and the like. If fertilizer is added to the raw water, the fertilizer provides nutrients, further increasing the proliferation of bacteria, mold, and the like.

[0081] (Release process) In the release step, the raw water supply means and the on-off valve are opened to resume the flow of raw water to the water purification agent soaking device 2. Specifically, during irrigation, the raw water supply means 1 and the on-off valve 3 are open. Immediately after irrigation begins, raw water (especially raw water containing a relatively high concentration of dissolved water purification agent components) from the water purification agent soaking device 2 flows through the irrigation tubes, effectively purifying the irrigation tubes, which previously had a favorable environment for bacterial proliferation. This effectively prevents clogging of the irrigation tubes. At this time, the relatively high concentration of water purification agent components is consumed by the purification process within the irrigation tubes, eliminating their impact on crop growth. Furthermore, after a certain time has elapsed since the start of irrigation, the water purification agent soaking device 2 begins to supply raw water containing a constant and desired concentration of water purification agent components, allowing purified raw water to be supplied to crops. This prevents crop diseases caused by bacteria, viruses, mold, and other contaminants in the raw water. Irrigation is usually carried out by repeating this release step and the above-mentioned stop step.

[0082] The frequency of irrigation from the irrigation tube is not particularly limited, and may typically be about 0.2 to 20 times per day. The frequency refers to the number of times irrigation is performed per day. For example, a frequency of 0.2 times per day means that irrigation is performed 0.2 times per day (i.e., once every 5 days). A frequency of 20 times per day means that irrigation is performed 20 times per day. The water purification agent 231 may be replenished when irrigation is not being performed, and may be replenished during the above-mentioned stopping step, for example. [Industrial Applicability]

[0083] The water purification system and method of the present invention are used for "irrigation" or "fertilization." The water purification system and method of the present invention can also be used, for example, for artificially supplying water to fields, so-called "field irrigation." [Explanation of symbols]

[0084] 1: Raw water supply means 2: Water purification agent soaking device 3: On-off valve 4: Irrigation tube 10: Water purification equipment 15: Raw water filter 16: Liquid fertilizer tank 17:Liquid fertilizer mixer 21: Immersion device main body member 211: Raw water flow path part 212: Water purification agent storage area 213:Coupling means 22: Cap member 221: Coupling means 23: Cartridge parts 230: Opening 231: Water purification agent 232: Cartridge packing 233: cartridge cap 24: Cartridge holding member 240: Upper end surface 241: Guidance window

Claims

1. A raw water purification facility, a raw water supply means for supplying raw water into the water purification facility; a water purification agent soaking device disposed downstream of the raw water feeding means and configured to soak a solid water purification agent in the raw water; an on-off valve disposed downstream of the water purification agent soaking device; and A water purification facility comprising an irrigation tube arranged downstream of the on-off valve.

2. The water purification system according to claim 1, wherein the water purification agent soaking device is a closed system.

3. The water purification agent soaking device includes a soaking device body member, The immersion device body member is A raw water flow path portion that conducts raw water horizontally; and A water purification agent storage portion that extends vertically and stores a water purification agent therein. The water purification system of claim 1 .

4. The water purification agent is filled inside a medicine barrel member, The cartridge member is held inside a cartridge holding member having a cylindrical shape while a ring-shaped cartridge packing is attached to an outer surface of the cartridge member, The water purification equipment according to claim 3, wherein the cartridge holding member is housed inside the water purification agent storage portion while holding the cartridge member in a hanging state inside the cartridge by its upper end surface and the cartridge gasket.

5. The water purification facility according to claim 1, wherein the water purification agent is a halogen-based solid water purification agent.

6. The water purification system according to claim 1 , wherein the water purification agent is a tablet.

7. The water purification agent is a tablet, The water purification facility according to claim 4 , wherein the tablets are packed in layers inside the cartridge member.

8. The water purification facility according to claim 1, further comprising a raw water filter between the water purification agent soaking device and the on-off valve, the raw water filter removing foreign matter from the raw water.

9. A liquid fertilizer tank containing a concentrated fertilizer concentrate; and a liquid fertilizer mixer that is disposed between the water purification agent soaking device and the on-off valve and mixes the concentrated fertilizer solution supplied from the liquid fertilizer tank with raw water; The water purification system of claim 1 further comprising:

10. The water purification facility according to claim 1 , wherein the water purification facility is a facility for irrigation or fertilization in crop cultivation.

11. A method for purifying raw water using the water purification equipment according to any one of claims 1 to 10, an immersion step of immersing the water purification agent in raw water; A stopping step of stopping the flow of raw water to the water purification agent soaking device; A water purification method comprising: a release step of releasing the stop of the flow of raw water to the water purification agent soaking device.

12. In the stopping step, the raw water supply means is "closed" and the on-off valve is "closed", The water purification method according to claim 11, wherein the raw water supply means and the on-off valve are opened in the release step.

Images