JP2021023834A - Water treatment apparatus - Google Patents

Abstract

To provide a solid chemical agent supply device which can stably elute a solid chemical agent.SOLUTION: A water treatment apparatus has a housing 51 in a cylindrical form having a bottom, and a chemical agent mounting part 53 that has a spouting pipe 52 erected upward in the housing 51 and allows a solid chemical agent to be mounted above the spouting pipe 52, in which the chemical agent mounting part 53 has a mounting part outlet 58 on the side face thereof for discharging the chemical solution in which the chemical agent has been dissolved, an outer diameter of the spouting pipe 52 is smaller than an outer diameter of the chemical agent mounting part 53, and accordingly the apparatus has an effect for setting concentration of a chemical solution obtained from the medical agent supply part 3 to desired concentration.SELECTED DRAWING: Figure 8

Description

The present invention relates to a water treatment device that purifies water by filtration and a solid chemical supply device used in the water treatment device.

Conventionally, as this type of solid drug supply device, a solid drug supply device that elutes a solid drug by bringing the solid drug into contact with water is known (see, for example, Patent Document 1).

Hereinafter, the solid drug supply device will be described with reference to FIG.

The solid drug supply device 101 includes a drug dissolution tank 102, an inlet pipe 103, and an outlet pipe 104. The drug dissolution tank 102 includes a gas phase portion 105, a liquid phase portion 106, and a solid drug 107 in a liquid phase portion 106. It is provided with a perforated plate 108 held above the liquid level of the above and a spray nozzle 109 arranged at the discharge portion of the inlet pipe 103. When the water discharged from the spray nozzle 109 comes into contact with the solid drug 107, the solid drug 107 elutes, the drug-eluted water flows through the outlet pipe 104 via the liquid phase portion 106, and the drug-eluted water enters the main path pipe. Is supplied. Such a solid drug supply device is used in a water purification system that performs sterilization and disinfection treatment by adding a solid drug such as calcium hypochlorite to raw water, and by immersion of the solid drug when the water purification system is stopped. Excessive elution can be suppressed.

Special Fair 4-4039 Gazette

In such a conventional solid drug supply device, when the solid drug supply device is used for a long period of time, the air inside elutes into water or becomes bubbles and is discharged to the outside of the system together with the raw water. The water level in the drug dissolving layer gradually rises, and the solid drug in the drug dissolving tank comes into contact with water. Then, when the drug comes into contact with water, the drug dissolves in water, and there is a problem that a drug solution having a desired concentration cannot be obtained.

Therefore, the present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a solid drug supply device capable of stably eluting a solid drug.

Then, in order to achieve this object, the water treatment apparatus according to the present invention
With a bottomed tubular housing
It has an ejection pipe erected upward in the housing.
Above the ejection tube, there is a drug placement section on which solid drugs are placed.
The drug loading section has a loading section outlet on the side surface for discharging the drug solution in which the drug has been dissolved.
The intended purpose is achieved by the configuration that the outer diameter of the ejection pipe is smaller than the outer diameter of the drug placing portion.

According to the water treatment apparatus of the present invention, since the outer diameter of the ejection pipe is reduced to secure the volume inside the housing, the liquid level of the chemical solution is unlikely to rise inside the housing, and as a result, the elution amount of the chemical is desired. Can be suppressed to the value of. Therefore, there is an effect that the concentration of the chemical solution obtained from the solid drug supply device can be set to a desired concentration.

Schematic of the overall configuration of the water treatment apparatus according to the first embodiment of the present invention. Internal structure perspective view of the water treatment equipment Cross-sectional view showing the inside of the filtration part of the water treatment equipment Schematic diagram showing the flow of water during filtration treatment of the water treatment equipment Schematic diagram showing the flow of water during reverse treatment of the water treatment equipment Schematic diagram showing the flow of water during rinsing treatment of the water treatment equipment Perspective view showing the drug supply part of the water treatment apparatus Cross-sectional view of the chemical supply section of the water treatment equipment (A) Cross-sectional view, (b) Enlarged cross-sectional view of the main part of the chemical supply section of the water treatment equipment Cross-sectional view of the supply valve used in the water treatment equipment Side view of the internal structure of the water treatment equipment Exterior perspective view of the water treatment equipment Schematic diagram showing the configuration of a conventional water treatment device

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The water treatment device 1 according to the present embodiment uses well water or water stored in a water tank as raw water, and is accumulated in the system by filtration treatment for removing metal ions and turbid components contained in the raw water, and filtration treatment. A backwash treatment is performed to discharge agglomerates of metal ions and turbid components to the outside of the system.

As shown in FIGS. 1 to 3, the water treatment device 1 has a filtration unit 2 containing a filter medium 2a and a drug supply unit 3 for adding a drug to raw water, and includes the filtration unit 2 and the drug supply unit 3. It is configured by connecting with piping as described later. The filtration unit 2 removes metal ions and turbid components from the raw water to purify the raw water, and is, so to speak, the heart of the water treatment device 1. The pipe on the side that sends the raw water to the filtration unit 2 is the raw water inflow pipe 10, and the pipe that sends the water purified by the filtration unit 2 from the filtration unit 2 is the purified water discharge pipe 20. The purified water is stored in a water purification tank and used as domestic water when needed.

Raw water is sent to the water treatment device 1 by an electric pump 4 connected to the inlet side (opposite side of the filtration unit 2) of the raw water inflow pipe 10. Instead of using the electric pump 4, a water storage tank may be provided at a high place, and raw water may be sent to the water treatment device 1 by the height difference between the water storage tank and the water treatment device 1. In addition, tap water jointly operated in the area may be directly connected. In the present embodiment, in addition to a well, a water tank, a water supply, etc., the water source includes devices for sending out raw water.

The electric pump 4 is a pump driven by an electric motor that sucks up and discharges well water or water stored in a water storage tank. For example, a centrifugal pump such as a vortex pump or a turbine pump, a vortex pump (cascade pump), a jet pump, etc. Axial flow pumps, mixed flow pumps, etc. are used. When used in a general household, the depth of the well needs to be about 1 to 10 meters for a shallow well and 10 to 30 meters or more for a deep well. Considering the head loss of the piping and the water treatment device in the subsequent stage, it is preferable that the head has a lift of 20 meters or more, and a vortex pump or a jet pump is more preferable. The flow rate discharged by the electric pump is, for example, about 5 liters to 50 liters per minute, but for general household use, a flow rate characteristic of about 5 liters to 15 liters per minute is more preferable.

The raw water inflow pipe 10 and the purified water discharge pipe 20 may be of any material and structure that can withstand the water pressure of the electric pump 4. Specifically, from the viewpoint of durability and ease of processing, for example, vinyl chloride resin, steel pipe, or straight pipe or pipe joint using these composite materials can be used. The nominal diameter is preferably large so that the head loss is low, for example, 13 to 50 mm, and preferably 1 to 5 mm in thickness.

The chemical supply unit 3 is provided in the path of the raw water inflow pipe 10. As will be described in detail later, the chemical supply unit 3 adds an oxidizing agent to the raw water, aggregates the metal ions contained in the raw water as a substance that is poorly soluble in water, and facilitates collection in the filtration unit 2. do.

(Filtration section)
As shown in FIG. 3, the filtration unit 2 includes a tank 2b, a filter medium 2a filled inside the tank 2b, a distribution plug 2c for connecting a pipe to the tank 2b, and a lead-out pipe 2d for taking out purified water after filtration. Have. The tank 2b in the present embodiment is a substantially cylindrical container, and the distribution plug 2c having a bowl-shaped bottom (not necessarily bowl-shaped) is provided on the top of the tank 2b for filtration. The inside and outside of part 2 are communicated. A water discharge port and a discharge pipe connection port are provided on the inner side of the distribution plug 2c, and the outlet pipe connection port and the purified water discharge pipe 20 communicate with each other, and the raw water inflow pipe 10 and the water discharge port communicate with each other. Two pipes extend in the horizontal direction on the outer side of the distribution plug 2c, and are connected to the raw water inflow pipe 10 and the purified water discharge pipe 20, respectively. In the present embodiment, the two pipes extending outward from the distribution plug 2c are arranged substantially in a straight line and extend in opposite directions from the center of the distribution plug 2c.

The outlet pipe 2d is arranged so as to be substantially vertical inside the tank 2b, the upper end is connected to the outlet pipe connection port of the distribution plug 2c, and the lower end is an open end near the bottom surface of the tank 2b. The outlet pipe 2d is for discharging the filtered water from the lower side to the upper side during the filtration treatment, and may be a pipe having less head loss and less likely to be clogged. For example, a straight pipe having a diameter of 20 mm or more can be used. The material is preferably one that is not easily corroded, and for example, resin or metal is preferable. As will be described in detail later, a lower strainer 2e is attached to the lower end of the lead-out pipe 2d so that the filter medium 2a and the like do not enter the lead-out pipe 2d.

As described above, the spout provided in the distribution plug 2c and the raw water inflow pipe 10 communicate with each other.

Raw water will flow into the filtration unit 2 from the spout. Upper strainer 2 at the spout
f is provided so as to cover the opening. The upper strainer 2f prevents the filter medium 2a from being discharged to the outside of the filtration unit 2 in the backwashing treatment described later.

The upper strainer 2f and the lower strainer 2e are arranged in order to prevent the filter medium 2a in the filtration unit 2 from flowing out from the filtration unit 2. That is, the upper strainer 2f is installed so as to cover the spout so that the filter medium 2a does not flow out from the filtering unit 2 during the backwashing treatment. The lower strainer 2e is installed so as to cover the opening at the lower end of the lead-out pipe 2d so that the filter medium 2a does not flow out from the filtration unit 2 during the filtration process. The upper strainer 2f and the lower strainer 2e may have a mesh shape, a slit shape, or the like, and may have a pore width of 0.3 to 1 mm or a gap smaller than that of the filter medium 2a. The material is preferably one that is not easily corroded like the lead-out pipe 2d, and for example, resin or metal is preferable.

The filter medium 2a included in the filtration unit 2 is the most basic member for exhibiting the performance of the water treatment device 1. The filter medium 2a is intended to capture and remove coarse particles and agglomerates having a particle size of about 10 micrometers or more to reduce the turbidity of raw water. The filter medium 2a can remove particles having a surface potential that are adsorbed on the filter medium 2a, particles having a particle size of about 1 to 10 micrometers, and chromaticity depending on the presence of ions in the raw water.

As the filter medium 2a, those suitable for the object to be removed, such as filtered sand and pellet-shaped fiber filter media, can be used. The material of the filter medium 2a may be, for example, sand, anthracite, garnet, ceramics, granular activated carbon, iron oxyhydroxide, manganese sand, or the like, which has a hardness that is hard to be deformed by pressure. The particle size may be, for example, 0.3 mm to 5.0 mm, an equality coefficient 1.2 to 2.0, or the like.

The specific gravity of the filter medium 2a differs depending on the material. For example, sand is about 2.5 to 2.7 g / cubic centimeter, anthracite is 1.4 to 1.8 g / cubic centimeter, and garnet is 3. 8.8 to 4.1 grams per cubic centimeter. The multi-layer filtration method in which a plurality of types of filter media are mixed and used is a method in which particles having different sizes are laminated in order from the bottom as a layer to be filtered by utilizing such a difference in specific gravity. In the multi-layer filtration method, it is common to mix particles having a large specific gravity and a small size and particles having a small specific gravity and a large size to form a multilayer structure. The multi-layer filtration method is preferable because it has advantages such as high filtration efficiency per unit volume and low head loss as compared with using a single type of filter medium. As the granular filter medium, for example, 0.3 mm of garnet, 0.6 mm of sand, and 1.0 mm of anthracite are mixed at a ratio of 2: 1: 1 and used, but turbid particles. It is desirable to adjust the mixing ratio and particle size according to the characteristics. The filling amount of the filter medium 2a is preferably determined in consideration of filtration performance, durability, head loss, and the like. By increasing the amount of the filter medium 2a, the removal performance and the amount of turbidity retained can be increased, the interval until cleaning can be extended, and the frequency of cleaning can be reduced. On the other hand, since the head loss rises, problems such as a decrease in the flow rate may occur.

In the present embodiment, the filter medium 2a is composed of three layers using activated carbon as the upper layer, manganese sand as the middle layer, and gravel as the lower layer. In the filtration unit 2 of the present embodiment, the above-mentioned filtration action works mainly on the upper layer and the middle layer. On the other hand, in the gravel layer having a relatively large particle size in the lowermost layer, manganese sand and activated carbon are added to the lower strainer 2e so as to improve the flow of water to the lower strainer 2e and prevent the filter medium 2a from flowing out from the lower strainer 2e. It also acts as a cover to prevent it from reaching. Further, in the case of the backwashing treatment described later, rectification is performed in the lowermost layer in order to facilitate the backwashing water ejected from the lower strainer 2e to flow to the middle layer and the upper layer.

Further, it is preferable that the pressure resistance of the filtration unit 2 containing the filter medium 2a has a capacity equal to or higher than the maximum output head of the electric pump 4 to be used. As the material of the filtration unit 2, a metal, a resin, a resin reinforced with glass fiber, or the like is suitable. The filtration unit 2 is required to have sufficient water resistance and weather resistance because it may be installed and used outdoors where a well is provided as well as in contact with water. Water resistance and weather resistance can be ensured by the material, wall thickness, or composite material such as coating. It is preferable that the size of the filtration unit 2 can secure a volume of about 1.5 to 3 times the total amount of the filter medium 2a to be put inside in consideration of the space developed by the filter medium 2a during backwashing. The shape is preferably cylindrical, spherical, or ellipsoidal, which has high durability against pressure, but if the container can be strengthened by wall thickness to ensure durability, a rectangular parallelepiped or cube can be used. You can also do it.

(Piping configuration)
In the water treatment device 1 of the present embodiment, in addition to filtering the raw water in the filtration unit 2 and taking it out as purified water, the particulate matter (dirt, turbid components, metal aggregates, etc.) collected by the filtration unit 2 is removed. It has a function of discharging to the outside of the system by backwashing. Next, the piping configuration in the water treatment apparatus 1 and the flow of water in the filtration treatment and the backwash treatment will be described.

FIG. 4 is a schematic view showing the overall configuration of the water treatment device 1 of the present embodiment and showing the flow of water during the filtration treatment. As shown in FIG. 4, the raw water inflow pipe 10 is connected to the filtration unit 2 from the raw water inlet 11 on the water source side via the chemical supply unit 3 during the filtration process. The purified water discharge pipe 20 is connected from the filtration unit 2 to the water purification outlet 21 of the water treatment device 1 during the filtration process.

On the other hand, FIG. 5 shows the flow of water during the backwash treatment. As shown in FIG. 5, during the backwashing process, the flow of water in the filtration unit 2 is reversed. Therefore, during the backwashing process, the filtration unit 2 sends water from the purified water discharge pipe 20 side to the filtration unit 2 and discharges water from the raw water inflow pipe 10 side. The water treatment device 1 according to the present embodiment can perform filtration treatment and backwash treatment by using one water source (electric pump 4) as one. Therefore, in order to allow the raw water to flow from the purified water discharge pipe 20 side in the filtration unit 2 during the backwash treatment, a backwash water pipe 80 for connecting the raw water inflow pipe 10 and the purified water discharge pipe 20 is provided. Here, in the raw water inflow pipe 10, a branch portion 13 between the chemical supply unit 3 and the filtration unit 2 is provided between the chemical supply unit 3 and the backwash drain pipe 40 for discharging the backwash drain that flows out from the filtration unit 2 during the backwash treatment. It is provided as a first branch. Further, the connection portion of the backwash water pipe 80 with the raw water inflow pipe 10 is set as a branch portion 12 as a second branch portion. The connection portion between the backwash water pipe 80 and the purified water discharge pipe 20 is designated as a branch portion 22 as a third branch portion.

In such a piping configuration, water flows as follows during the filtration process (FIG. 4).
Raw water inlet 11 → (raw water inflow pipe 10) → branch part 12 → chemical supply part 3 → branch part 13 → filtration part 2 → (purified water discharge pipe 20) → branch part 22 → water purification outlet 21
A check valve 62 is provided in the path of the purified water discharge pipe 20. The purified water taken out from the purified water outlet 21 is often connected to a water purification tank provided at a high place by piping. The check valve 62 stops the backflow of purified water from a water purification tank provided at a high place and prevents the backflow of water into the filtration unit 2.

On the other hand, during the backwashing process, water flows as follows (Fig. 5).
Raw water inlet 11 → (raw water inflow pipe 10) → branch 12 → (backwash water pipe 80) → branch 22 → (purified water discharge pipe 20) → filtration part 2 → (raw water inflow pipe 10) → branch 13 → ( Backwash drain pipe 40) → Backwash drain port 41
In the filtration process and the backwash process, an on-off valve for switching the communication direction at the branch portion 12, the branch portion 13, and the branch portion 22 is provided so as to flow the water. The on-off valve used in this embodiment uses the same type of manual valve, and when it is opened, the longitudinal direction of the handle is parallel to the pipe, and when it is closed, the longitudinal direction of the handle is orthogonal to the pipe. To. In the following, the direction of the handle shall mean the longitudinal direction of the handle.

In the water treatment device 1 of the present embodiment, the above switching is realized by four on-off valves (two-way valves). That is, the backwash water supply valve 81 provided in the backwash water pipe 80, the chemical supply valve 14 provided between the branch portion 12 and the chemical supply portion 3 in the raw water inflow pipe 10, and the purified water discharge pipe 20 are branched. The flow of water for the filtration treatment and the backwash treatment is switched by the combination of opening and closing the purified water take-out valve 23 provided between the portion 22 and the water purification outlet 21 and the backwash valve 42 provided in the backwash drain pipe 40.

During the filtration process, the chemical supply valve 14 and the purified water take-out valve 23 are opened, and the backwash water supply valve 81 and the backwash valve 42 are closed. That is, the branch portion 12 communicates the raw water inlet 11 with the chemical supply unit 3, the branch portion 13 communicates the chemical supply unit 3 with the filtration unit 2, and the branch portion 22 communicates with the filtration unit 2 and the water purification outlet 21. To communicate.

On the other hand, during the backwash process, the chemical supply valve 14 and the purified water take-out valve 23 are closed, and the backwash water supply valve 81 and the backwash valve 42 are opened. That is, at the branch portion 12, the raw water inlet 11 and the backwash water pipe 80 are communicated with each other, and at the branch portion 13, the connection side of the filtration unit 2 with the raw water inflow pipe 10 and the backwash drain port 41 are communicated with each other to branch. In the section 22, the connection side between the backwash water pipe 80 and the purified water discharge pipe 20 of the filtration section 2 is communicated with each other.

That is, the communication direction of the branch portion 12 is switched by the chemical supply valve 14 and the backwash water supply valve 81. Further, the water outlet is determined by the purified water take-out valve 23 and the backwash valve 42. As described above, in the present embodiment, the two-way valve is used, and the piping route is switched without using the three-way valve having a complicated structure. Therefore, clogging of the piping can be suppressed, and the cost of the device can be suppressed.

Further, in the present embodiment, the backwash water supply valve 81 and the backwash valve 42 are arranged with the water supply direction vertical, and the chemical supply valve 14 and the purified water take-out valve 23 are arranged with the water supply direction horizontal. With such an arrangement, the handles of the backwash water supply valve 81, the backwash valve 42, the chemical supply valve 14, and the purified water take-out valve 23 are all oriented in the horizontal direction during the filtration process. In addition, during the backwash treatment, the handles of the backwash water supply valve 81, the backwash valve 42, the chemical supply valve 14, and the purified water take-out valve 23 are all oriented in the vertical direction, which makes it look good and makes it easy for the user to understand the operating state. There are merits.

In addition, a large flow rate is required when performing the backwash treatment. That is, the flow rate during the filtration process is smaller than the flow rate during the backwash process. Therefore, a throttle portion is provided in a part of the pipe passing through during the filtration process to suppress the flow rate during the filtration process. Specifically, in the purified water discharge pipe 20, the throttle portion 24 is provided on the downstream side of the branch portion 22. By combining the throttle portion 24 and the electric pump 4, the flow rate during the filtration process is set to a desired design value.

On the other hand, since the piping during the backwash treatment does not have a portion having a reduced diameter such as the throttle portion 24, a larger flow rate than during the filtration treatment can be secured and the backwash treatment can be performed efficiently. That is, the minimum diameter portion of the pipe used only for backwashing, the backwashing water pipe 80, and the backwashing drain pipe 40 is larger than the opening of the drawing portion 24.

The water treatment device 1 of the present embodiment can perform a "rinse treatment" for discharging foreign matter remaining in the pipe during the backwash treatment. This rinsing process will be described with reference to FIG. The pipe for rinsing the water purification discharge pipe 20 includes a branch portion 26, a rinse drain pipe 27, and a rinse drain valve 28. The branch portion 26 is provided between the branch portion 22 and the water purification outlet 21 in the water purification discharge pipe 20. Then, the branch portion 26 branches the rinse drain pipe 27 from the purified water discharge pipe 20. The rinse drain valve 28 opens and closes the rinse drain pipe 27, and when the rinse drain pipe 27 is opened, the water flowing through the purified water discharge pipe 20 flows to the rinse drain port 29. The rinse drain valve 28 is closed during the filtration process and the backwash process.

In the rinsing treatment, the chemical supply valve 14 is opened, the purified water take-out valve 23 is closed, and the backwash water supply valve 81 and the backwash valve 42 are closed. Further, the rinse drain valve 28 is opened. By such a valve operation, water flows as follows during the rinsing process.
Raw water inlet 11 → (raw water inflow pipe 10) → branch part 12 → chemical supply part 3 → branch part 13 → filtration part 2 → (purified water discharge pipe 20) → branch part 22 → (squeezing part 24) → branch part 26 → rinse Drain mouth 29
Immediately after the backwash treatment is completed, foreign matter washed out by the backwash of the filtration unit 2 remains in the filtration unit 2 or in the piping of the water treatment device 1. Therefore, the foreign matter can be discharged by the rinsing treatment.

Further, in the water treatment device 1 of the present embodiment, a direct drainage pipe 70 that bypasses the throttle portion 24 and a direct drainage valve 71 that opens and closes the direct drainage pipe 70 are provided. Since the throttle portion 24 is a portion in which the pipe diameter is reduced, foreign matter is easily clogged. Therefore, during the backwashing process for discharging foreign matter, it is preferable to directly open the drainage valve 71 and bypass the throttle portion 24 which is the minimum diameter portion.

Further, depending on the degree of contamination of the raw water, it may be better to drain the water as it is without passing through the filtration unit 2. In such a case, the drain valve 71 may be opened directly. For example, when well water is used as raw water, the degree of contamination of the accumulated well water is large immediately after the water treatment device 1 is installed, and if the well water is filtered (passed through the filtration unit 2) as it is, the desired purification performance cannot be obtained and foreign substances are removed. The contained water will flow out from the water purification outlet 21. Therefore, it is advisable to drain the initial raw water immediately after installation without filtering. That is, by opening the backwash water supply valve 81 and the rinse drain valve 28 and closing the chemical supply valve 14 and the purified water take-out valve 23, the raw water taken into the system does not pass through the filtration unit 2 and the chemical supply unit 3. It can be drained directly. Also in this case, the drain valve 71 may be opened directly.

Further, by opening the backwash water supply valve 81 and the purified water take-out valve 23 and closing the chemical supply valve 14 and the rinse drain valve 28, the raw water taken into the system does not pass through the filtration unit 2 and the chemical supply unit 3. It can also be taken out directly.

(Filtration, backwashing action)
The filtration treatment and the backwash treatment in the water treatment apparatus 1 of the present embodiment will be described with the above configuration (FIGS. 2 to 5).

As described above, during the filtration process, the chemical supply valve 14 and the purified water take-out valve 23 are opened, and the backwash water supply valve 81 and the backwash valve 42 are closed. Then, when the electric pump 4 is operated, the raw water sent in the raw water inflow pipe 10 is added with a chemical in the chemical supply unit 3 and flows into the filtration unit 2. Then, the raw water passes through the upper strainer 2f and then from the upper side to the lower side of the filter medium 2a, and at this time, the turbid component is removed by the filtering action of the filter medium 2a. Finally, after flowing into the lower strainer 2e, it passes through the inside of the outlet pipe 2d, exits the filtration unit 2, and the treated water is obtained from the purified water discharge pipe 20.

Inside the filtration unit 2, the suspended substance is first captured by the activated carbon layer in the upper layer, and the aggregation of metal ions is promoted. The manganese sand layer in the middle layer mainly captures the aggregates of metal ions aggregated in the upper layer.

On the other hand, during the backwash process, the chemical supply valve 14 and the purified water take-out valve 23 are closed, and the backwash water supply valve 81 and the backwash valve 42 are opened. Then, when the electric pump 4 is operated, the raw water flows back from the branch portion 12 through the backwash water pipe 80 to the purified water discharge pipe 20 and flows into the filtration portion 2. In the filtration unit 2, the raw water flows downward in the outlet pipe 2d and infiltrates into the tank 2b from the lower strainer. Raw water flows from bottom to top in tank 2b. At that time, by stirring and developing the activated carbon in the upper layer, the suspended substances and agglomerates collected by the filter medium 2a are separated from the filter medium 2a, and from the connection port of the raw water inflow pipe 10 to the outside of the system of the filtration unit 2. It discharges.

(Drug supply department)
Next, the drug supply unit 3 will be described with reference to FIGS. 2, 7, and 8.

The drug supply unit 3 is arranged at the uppermost part of the water treatment device 1. That is, the chemical supply unit 3 is provided in the raw water inflow pipe 10 at the upper part of the pipe that rises upward from the raw water inlet 11. Further, the pipe from the outlet (drug outlet 32) of the drug supply section 3 extends downward and is connected to the filtration section 2 via the branch section 13. As will be described in detail later, the drug supply unit 3 has an inflow path 31, a drug path 32, a bypass path 33, and an outflow path 34. The inflow path 31 is connected to the raw water inflow pipe 10 to allow the raw water to flow into the chemical supply unit 3. The drug passage 32 branches from the inflow passage 31 and dissolves the drug. The bypass path 33 is also branched from the inflow path 31 and is provided to adjust the chemical solution to a required concentration. The outflow passage 34 merges with the chemical passage 32 and the bypass passage 33, is connected to the raw water inflow pipe 10 again, and sends out the raw water containing the chemical to the raw water inflow pipe 10.

The drug path 32 is formed inside the drug section 50 having a tubular housing 51. The housing 51 has a bowl-shaped base 51a provided at the bottom and an upper cover 51b that covers the base 51a. More specifically, the housing 51 has a truncated cone shape with a smaller diameter toward the upper part. An inflow path 31, a bypass path 33, and an outflow path 34 are connected to the base 51a, and a branch (branch portion 35) is formed inside the base 51a. At the branch portion 35, the raw water flowing in from the inflow passage 31 is branched into the chemical passage 32, the outflow passage 34, and the bypass passage 33. The drug passage 32 is a housing, which is an ejection pipe 52 that rises in the vertical direction after branching, a drug placing portion 53 that comes into contact with the drug at the upper part of the ejection tube 52 and elutes the drug, and an outer circumference of the ejection pipe 52. It is composed of a collection unit 54 that is inside the 51. The chemical solution (raw water containing the drug) produced in the drug passage 32 is sent to the outflow channel 34 from the collection opening 55 that communicates between the recovery unit 54 and the outflow channel 34.

The upper part of the ejection pipe 52, that is, the outer diameter of the ejection pipe 52 in the drug placing portion 53 has a larger diameter than the lower part, so that a desired amount of the drug can be retained. Further, the horizontal cross-sectional area of the recovery portion 54 is secured by reducing the outer diameter of the lower portion of the ejection pipe 52.

After branching at the branching portion 35, the bypass passage 33 merges at the outlet side of the outflow passage 34 in the state of raw water (merging portion 36).

The raw water flowing through the outflow passage 34 is branched at the branch portion 35 and then merges with the chemical solution prepared in the chemical passage 32 at the recovery opening 55. Further downstream of the outflow channel 34, the confluence section 36 merges with the bypass path 33 to obtain a drug solution having a desired concentration and is delivered from the drug supply section 3.

That is, the raw water that has flowed into the drug supply section 3 is branched into the drug path 32, the bypass path 33, and the outflow path 34 at the branch section 35. The flow rate flowing through the drug passage 32 is adjusted by this branching, and the amount of contact between the drug and the raw water, which will be described later, is adjusted. Therefore, the raw water that comes into contact with the drug in the drug path 32 becomes a drug solution having a desired concentration. Next, the raw water that has passed through the drug passage 32 merges with the raw water that flows through the outflow passage 34 at the recovery opening 55. The raw water of the outflow channel 34 branched at the branch portion 35 at a desired ratio merges with the drug solution of the drug path 32 also adjusted at a desired concentration and flow rate at the recovery opening 55 to obtain a drug solution having a desired concentration. .. The merging portion 36 is supposed to merge with the raw water flowing through the bypass passage 33, but it is preferable to check the concentration of the drug after the merging portion 36 and adjust the flow rate of the bypass passage 33.

The ejection pipe 52 is a small-diameter pipe line and is erected with a drug placing portion 53 at the upper part. The ejection pipe 52 supports the drug placing portion 53 inside the housing 51. As a result, the drug placing portion 53 is fixed at a position higher than the center of the housing 51. The drug placing portion 53 has a dish-like shape or a box-like shape with an open upper portion. The bottom of the drug loading portion 53 is provided with an opening, is connected to the ejection pipe 52, and communicates the ejection pipe 52 with the inside of the drug loading portion 53. The horizontal diameter of the ejection pipe 52 at the height of the drug placing portion 53 is larger than the diameter of the lower portion of the ejection pipe 52. First, by reducing the diameter of the lower part of the ejection pipe 52 and providing the drug placing portion 53 on the upper part of the ejection pipe 52, it is possible to bring the raw water into contact with the drug at a desired flow rate. The drug placing portion 53 has a size for securing the amount (number) of the drugs to be placed so that a drug solution having a desired concentration can be obtained with respect to the flow rate of the raw water.

The drug solution in which the drug is dissolved flows out to the inside of the housing 51, that is, to the recovery section 54 from the placement section outlet 58 provided on the side surface of the ejection pipe 52 on the side of the drug placement section 53. In the recovery unit 54, the chemical solution in which the chemical is dissolved is stored in the lower part (base 51a) of the housing 51, and then flows out from the recovery opening 55 to the outflow passage 34. Since the diameter of the ejection pipe 52 is reduced and the distance from the inner wall surface of the housing 51 is secured, the raw water in which the chemicals that have flowed down into the housing 51 has the liquid level relative to the height of the housing 51. , 1/2 or less. By storing the chemical solution in the housing 51 at a desired depth, the ratio of the chemical solution mixed with the raw water in the outflow passage 34 is adjusted.

Further, when the housing 51 is filled with the chemical solution in the operating state, the amount of the chemical solution placed on the drug placing portion 53 becomes large, and the chemical solution having a desired concentration cannot be obtained. Alternatively, the drug may dissolve and disappear. Therefore, it is necessary to keep the liquid level in the housing 51 low.

The drug placing portion 53 includes a solid drug, that is, a water-soluble solid drug 60. As the water-soluble solid drug 60, tablets or granules may be used. This is because the surface area of the water-soluble solid drug 60 can be increased and a stable solvent concentration can be maintained. For tablets, tablets having a diameter of 30 mm and a height of 10 to 20 mm may be used, and for granules, tablets having a diameter of 5 mm to 15 mm may be used. When the size of the water-soluble solid drug 60 is small, the adjacent drugs come into contact with water at the same time and the drugs stick to each other. If it adheres, only the lower part of the drug may come into contact with water and the desired concentration of the drug solution may not be obtained. Alternatively, when the size of the water-soluble solid drug 60 is small, the contact area with water supplied from the ejection pipe 52 becomes large, and a drug solution having a desired concentration cannot be obtained. Therefore, in order to supply the drug solution having a desired concentration, the water-soluble solid drug 60 having the above-mentioned size is used.

In the present embodiment, the drug placing portion 53 is provided with a guide (not shown) so that the water-soluble solid drug 60 of the tablet can be held in the vertical direction. That is, the guide has a long rail shape in the vertical direction, and by inserting the water-soluble solid drug 60 between the two rails, the water-soluble solid drug 60 is held as if it were stacked in the vertical direction. Therefore, the water-soluble solid drug 60 dissolves in the raw water from below, and a drug solution having a desired concentration can be obtained.

Further, as described above, the water-soluble solid drug 60 functions to oxidize metal ions contained in raw water to form aggregates that are poorly soluble in water. Various oxidizing agents can be used as the water-soluble solid drug 60, but it is preferable that the water-soluble solid drug 60 is easily dissolved in water during operation, that is, when the drug is added to raw water. Further, it is preferable that the solid shape is maintained and does not flow out from the drug placing portion 53 during the stoppage or the backwash process, that is, when the addition of the drug is interrupted. In this embodiment, trichloroisocyanuric acid is used.

Since each member of the drug supply unit 3 may be in contact with the drug for a long time, it is preferable to select a material having low reactivity to the drug such as PVC (polyvinyl chloride), PMMA (polymethylmethacrylate), PP (polypropylene). .. On the other hand, since the ejection pipe 52 needs to have strength to support the drug placing portion 53, the material of the ejection tube 52 is vinyl chloride or ABS (acrylonitrile, butadiene, styrene), which is stronger than PP, considering compatibility with the drug. It is preferable to select such as. The outer diameter of the ejection pipe 52 may be suppressed to one-fourth or less of the inner diameter of the base 51a. As described above, a space (recovery unit 54) for temporarily storing the solution after the drug is supplied discharged from the mounting unit outlet 58 can be provided on the outside of the ejection pipe 52, and the water level in the housing 51 suddenly rises. This is because it can be suppressed from rising and reaching the drug placing portion 53. For example, when the inner diameter of the base 51a is 130 mm, a vinyl chloride pipe having an outer diameter of about 25 to 40 mm may be used. That is, the outer diameter of the ejection pipe 52 may be 1/3 or less of the inner diameter of the housing 51. In this way, by reducing the outer diameter of the ejection pipe 52, it is possible to secure a large horizontal cross-sectional area in the recovery section 54, that is, a large area of the chemical liquid water surface stored in the recovery section 54. Therefore, the height of the chemical solution stored in the recovery unit 54 can be kept low, and as a result, the elution amount of the chemical solution can be appropriately set, and the chemical solution having a desired concentration can be obtained. In the present embodiment, the upper cover 51b has a truncated cone shape, the base 51a has a substantially cylindrical bottom, and the inner diameter of the base 51a is the maximum inner diameter of the housing 51.

Further, the ejection pipe 52 includes a partition plate 56 that vertically partitions the inside of the ejection pipe 52. The drug placing portion 53 is provided on the partition plate 56, and the water-soluble solid drug 60 is placed on the drug placing portion 53. The partition plate 56 is provided with a mounting portion inlet 57 into which raw water sent from the ejection pipe 52 flows. The mounting portion entrance 57 is provided near the central portion of the partition plate 56, but does not have to be the center. Further, the partition plate 56 has a mortar-shaped outer peripheral portion raised and the vicinity of the mounting portion entrance 57 lowered. The mounting portion entrance 57 may be formed by forming a net-like central portion of the partition plate 56. Alternatively, it may be at least one donut-shaped slit formed so as to surround the central portion of the partition plate 56, or a plurality of small hole groups. Further, on the side surface of the ejection pipe 52, there is a mounting portion outlet 58 from which raw water containing a dissolved drug flows out. The mounting portion outlet 58 is provided at a position higher than the top of the outer peripheral portion of the partition plate 56. Then, the water-soluble solid drug 60 is arranged on the partition plate 56 in the radial direction between the mounting portion inlet 57 and the mounting portion outlet 58.

According to such a configuration, the water-soluble solid drug 60 is arranged closer to the center on the mortar-shaped partition plate 56. Then, the raw water sent from the ejection pipe 52 infiltrates from the loading portion inlet 57, comes into contact with the water-soluble solid drug 60 placed near the center, and dissolves the water-soluble solid drug 60 to become a chemical solution. The raw water in which the drug is dissolved rises upward and flows out from the loading section outlet 58 into the housing 51 of the drug supply section 3. At this time, since the water-soluble solid drug 60 is arranged between the mounting portion inlet 57 and the mounting portion outlet 58 in both the radial direction and the vertical direction, it always comes into contact with the raw water and is placed as a chemical solution. It flows out from the part outlet 58. In addition, the degree of contact of the water-soluble solid drug 60 can be ensured with respect to a predetermined flow rate, and the drug solution can be obtained in a desired concentration range.

Further, according to the above configuration, it is possible to prevent the water-soluble solid drug 60 above the loading portion outlet 58 from containing water, so that it is possible to prevent the water-soluble solid chemicals 60 from sticking to each other and sticking to the wall surface. It is possible. Since sticking can be prevented, when the water-soluble solid drug 60 in the lower layer is eluted and disappears, the solid drug in the upper part is lowered by gravity, and the water-soluble solid drug 60 can be supplied to the lower part. That is, the water-soluble solid drug 60 and raw water can be continuously brought into contact with each other. Then, the drug concentration can be stabilized even when the drug supply device is used for a long period of time.

Further, the outer wall surface of the ejection pipe 52 and the drug loading portion 53 is an angle formed by a straight line lowered vertically downward from an arbitrary position on the outer wall surface and the outer wall surface below the loading portion outlet 58 (in FIG. 9). The angle α) is preferably 0 to 45 degrees. By not squeezing the outer wall surface at a steep angle, the raw water flowing out from the loading portion outlet 58 flows down along the outer wall surface of the ejection pipe 52 and the drug loading portion 53, and the raw water (chemical solution) stored in the housing 51. ) And gently mix. Therefore, it becomes difficult for blisters to form on the liquid surface.

On the other hand, when the raw water containing the drug flows out into the air away from the outer wall surface of the ejection pipe 52 and the drug placing portion 53, blisters are formed when the raw water (chemical solution) stored in the housing 51 is mixed. It will be. The blisters fill the inside of the housing 51 and raise the apparent water level. Alternatively, since the formed blisters are discharged from the outflow passage 34 together with the chemical solution, the air in the housing 51 is reduced, and as a result, the water level in the recovery unit 54 rises. That is, the increased water level causes water to be immersed in the water-soluble solid drug 60, and as a result, the drug is excessively dissolved, and a drug solution having a desired concentration cannot be obtained. On the other hand, in the present embodiment, the raw water flowing out from the loading portion outlet 58 flows down along the outer wall surface of the ejection pipe 52 and the drug loading portion 53 so as not to form blisters in the housing 51. ing.

Further, in the drug passage 32 (spout pipe 52), the bypass passage 33, and the outflow passage 34, a throttle portion is provided immediately after (downstream side) the branch portion 35. This throttle portion is provided in order to adjust the distribution of the raw water flowing through the drug passage 32, the bypass path 33, and the outflow path 34, and to make the concentration of the drug in the raw water flowing out from the drug supply section 3 a desired concentration. The bypass path 33 is provided with an on-off valve 33a so that the bypass path 33 can be closed. In these throttles, the opening area of the throttle provided in the outflow passage 34 is larger than the opening area of the throttle provided in the other drug passage 32 (spout pipe 52) and the bypass passage 33. The concentration of the drug solution flowing out of the drug supply unit 3 can be set within a desired range.

Further, the housing 51 of the drug supply unit 3 is capable of removing the upper cover 51b from the base 51a. Since dirty raw water flows into the drug supply unit 3, regular maintenance is required. Therefore, the upper cover 51b is removed so that the inside can be cleaned. Further, the ejection pipe 52 can be removed at the branch portion 35. As described above, the drug passage 32 (spout pipe 52), the bypass passage 33, and the outflow passage 34 are each provided with a throttle on the downstream side of the branch portion 35, and foreign matter may be present in the throttle portion depending on long-term use. It is possible that it will adhere. Therefore, the ejection pipe 52 is removed at the branch portion 35 to enable cleaning inside the pipe.

The upper cover 51b may be partially or wholly transparent. By making the upper cover 51b transparent, the presence of the water-soluble solid drug 60 can be confirmed inside, and it can be replenished if necessary. In particular, it is preferable to make the upper part of the upper cover 51b, which is above the liquid level of the chemical solution in the housing 51, transparent. Further, the top surface of the upper cover 51b may be used as a supply port for the water-soluble solid drug 60, and this supply port may be made transparent. Further, as described above, since the water-soluble solid drug 60 is supported by the guide and arranged side by side, it is easy to confirm the input amount from the outside.

Since raw water containing dirt flows into the housing 51 of the drug supply unit 3, the inside becomes dirty. However, as described above, the water surface inside the housing 51 is designed to be at least half the height of the housing 51 during operation. Further, the loading portion outlet 58 is provided on the side surface of the drug loading portion 53. Therefore, the raw water does not reach the vicinity of the top surface of the housing 51, so that the vicinity of the supply port is not easily soiled. That is, by making the supply port transparent, the water-soluble solid drug 60 of the drug placing portion 53 can be easily visually recognized.

(Air supply valve)
Here, a special configuration and an action during the backwashing treatment will be described.

As described above, the backwash drain pipe 40 is formed by piping the backwash drain port 41 from the branch portion 13. An air supply valve 43 is provided on the downstream side of the backwash valve 42 in the middle of the path of the backwash drain pipe 40. One of the air supply valves 43 is connected to the backwash drain pipe 40, and the other is open to the atmosphere side. The air supply valve 43 has a check valve structure, which allows inflow from the atmosphere side and prevents outflow from the backwash drain pipe 40 side. Further, the air supply valve 43 is provided with a valve structure portion at a position rising upward from the backwash drain pipe 40.

The operation of the air supply valve 43 in such a structure will be described.

During the filtration process, the backwash valve 42 is closed, and the backwash drain pipe 40 on the downstream side of the backwash valve 42 is filled with air. Then, when the backwash treatment is switched, the air in the backwash drain pipe 40 moves upward and supplies the air into the drug supply unit 3. When the drug supply unit 3 is filled with air, the water-soluble solid drug 60 is exposed to air instead of being immersed in raw water. Therefore, it is possible to prevent the water-soluble solid drug 60 from being unnecessarily dissolved and to be prevented from being dissolved and fixed.

On the other hand, since the backwash treatment is performed in the backwash drain pipe 40, drain water flows and is filled with the drain water. When the backwash treatment is completed, air is sent from the air supply valve 43 into the backwash drain pipe 40. Therefore, at times other than the backwash treatment, the backwash drain pipe 40 is filled with air, and air can be sent to the chemical supply unit 3 at the time of the next backwash treatment.

The air supply valve 43 is provided so as to rise upward from the branch point of the backwash drain pipe 40 with respect to the backwash drain pipe 40 so that the inside of the air supply valve 43 is filled with air and water is provided. It has a structure that suppresses intrusion. That is, the air supply valve 43 is protected from dirty water, and air supply can be reliably performed.

Further, in the present embodiment, the air supply valve 43 is used as a check valve, but other types of valves may be used as long as air can be sent into the check drain pipe 40. For example, a method of sending air into the backwash drain pipe 40 when the backwash treatment is completed using a manual valve, a drain hole and a stopper are provided in the path of the backwash drain pipe 40, and the backwash treatment is completed. At that point, the stopper may be removed, the water in the backwash drain pipe 40 may be drained, and air may be filled.

(Arrangement of filtration part)
Even if the filter medium 2a filled in the filtration unit 2 is backwashed, its performance deteriorates due to long-term use. Therefore, the filtration unit 2 requires regular maintenance. In order to maintain the filtration unit 2, the water treatment device 1 of the present embodiment can remove the filtration unit 2.

As shown in FIG. 11, when the filtration unit 2 is viewed from a predetermined direction, pipes (raw water inflow pipe 10, purified water discharge pipe 20, backwash water pipe 80, backwash drain pipe 40, etc.), chemical supply part 3 Is arranged separately from the filtration unit 2. That is, when the connection joint 15 provided at the connection portion between the filtration unit 2, the raw water inflow pipe 10 and the purified water discharge pipe 20 is opened, the filtration unit 2 can slide and move in one direction and the opposite direction. In FIG. 11, the movement is possible in the direction perpendicular to the paper surface. Therefore, the connection surface on the other side of the connection joint 15 is provided parallel to the moving direction of the filtration unit 2. The connection joint 15 has an inflow side joint provided on the raw water inflow pipe 10 side and an outflow side joint provided on the purified water discharge pipe 20 side, and the filtration unit 2 is connected by connecting the two connection joints 15. It is connected to the piping inside the main body.

Further, as shown in FIG. 12, in the water treatment device 1 of the present embodiment, in order to protect the pipes, the outer shell is covered with a panel to form a housing. As described above, since the filtration unit 2 can move in one direction and the opposite direction, the inspection panel 61 is a panel in one direction and the opposite surface to the filtration unit 2 among the outer panels. Maintenance of the filtration unit 2 can be performed by removing both or one of the inspection panels.

In this way, the filtration unit 2 can be translated toward one inspection panel 61 or the inspection panels 61 provided at two locations facing each other, and maintenance of the filtration unit 2 can be performed with a small inspection space. It will be possible.

In the present embodiment, the filtration unit 2 can be moved in one direction and the opposite direction, but it may be in only one direction. In that case, the connection surface on the other side (anti-filtration unit 2 side) of the connection joint may be directed to the unidirectional side. That is, the connection surface on the piping side facing the connection joint 15 faces in one direction in which the filtration unit 2 moves, or the connection surface of the connection joint 15 is arranged parallel to the direction in which the filtration unit 2 moves. It suffices if it is done. According to such an arrangement, the filtration unit 2 can move in at least one direction.

The water treatment device according to the present invention is a water treatment device that can supply a sufficient amount of clean backwash water for backwashing and can be installed in a space-saving manner as compared with conventional products, and is therefore used for purifying well water and stored water. It is useful as a small water treatment device for home use.

1 Water treatment device 2 Filter 2a Filter material 2b Tank 2c Connection valve 2d Outlet pipe 2e Lower strainer 2f Upper strainer 3 Chemical supply unit 4 Electric pump 10 Raw water inflow pipe 11 Raw water inlet 12 Branch part 13 Branch part 14 Chemical supply valve 15 Connection 20 Purified water discharge pipe 21 Purified water outlet 22 Branch part 23 Purified water take-out valve 24 Squeezing part 26 Branch part 27 Rinse drain pipe 28 Rinse drain valve 29 Rinse drain port 31 Inflow path 32 Chemical path 33 Bypass path 33a Open / close valve 34 Outflow path 35 Branch 36 Confluence 40 Backwash drain pipe 41 Backwash drain port 42 Backwash valve 43 Air supply valve 50 Drug section 51 Housing 51a Base 51b Top cover 52 Ejection pipe 53 Drug loading section 54 Recovery section 55 Recovery opening 56 Partition plate 57 Mounting part inlet 58 Mounting part outlet 60 Water-soluble solid chemicals 61 Inspection panel 62 Check valve 70 Direct drainage pipe 71 Direct drainage valve 80 Backwash water supply pipe 81 Backwash water supply valve

Claims (5)

With a bottomed tubular housing
It has an ejection pipe erected upward in the housing.
Above the ejection tube, there is a drug placement section on which solid drugs are placed.
The drug loading section has a loading section outlet on the side surface for discharging the drug solution in which the drug has been dissolved.
A solid drug supply device characterized in that the outer diameter of the ejection pipe is smaller than the outer diameter of the drug placing portion. The housing has a truncated cone shape that expands downward.
The solid drug supply device according to claim 1, wherein the maximum outer diameter of the ejection pipe is 1/3 or less of the maximum inner diameter of the housing. The ejection tube and the drug placing portion have a shape having the same or smaller diameter downward.
The solid drug supply device according to claim 1 or 2, wherein the inclination angle formed by the side surface of the ejection pipe and the drug placement portion and a straight line directed downward vertically is 0 to 45 degrees. The solid drug supply device according to claim 1, wherein the inclination angle formed by the side surface of the ejection pipe and the drug placement portion and a straight line vertically downward changes continuously downward. A water treatment device including the solid drug supply device according to any one of claims 1 to 4.