CN111065604A

CN111065604A - Chemical supply device and water purification system using same

Info

Publication number: CN111065604A
Application number: CN201880054797.XA
Authority: CN
Inventors: 野间真二郎; 广田达哉; 平山哲章; 五百崎太辅; 藤田浩史; 丸尾友子
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2017-08-28
Filing date: 2018-04-25
Publication date: 2020-04-24
Also published as: WO2019044033A1; JP6846660B2; JPWO2019044033A1

Abstract

A drug supply device (1) is provided with: a drug storage unit (2) that contains a drug (8), and that includes a membrane (6) through which the drug (8) can permeate and a membrane support unit (7) that supports the membrane (6); a water supply unit (3) that supplies water to be treated to the membrane (6); a mixing unit (4) for mixing the water to be treated supplied from the water supply unit (3) with the chemical (8) impregnated in the membrane (6); and a discharge unit (5) that discharges the water to be treated, in which the chemical (8) is mixed.

Description

Chemical supply device and water purification system using same

Technical Field

The present invention relates to a chemical supply device and a water purification system. More particularly, the present invention relates to a chemical supply device capable of supplying a fixed amount of chemical to water to be treated without using expensive equipment such as a fixed displacement pump, and a water purification system using the chemical supply device.

Background

In general, in a water purification plant, water to be treated is taken from a water source such as a river or a reservoir, and suspended solids and colloids are removed from the water to be treated through a unit process of flocculation, floc formation, precipitation, filtration, and disinfection (see, for example, patent document 1).

In recent years, various chemical supply devices have been proposed as chemical supply devices for purifying water to be treated. For example, patent document 1 proposes a flocculant injection device including a flocculant storage tank, a flocculant transfer dosing pump, a water supply device using treated water after completion of purification treatment as a water supply source, an injector, and a nozzle-attached injection pipe.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5121983

In developing countries where the social infrastructure is incomplete, there are also large areas where there is no public water treatment facility. In such areas, there is a demand for water purification by installing a water treatment apparatus in each home. In particular, there is a demand for removing turbid components such as metal ions and silica contained in water to be treated by a water treatment apparatus installed in a household.

However, the coagulant injection device disclosed in patent document 1 is premised on water purification in a public water purification plant. The dosing pump used in the coagulant injection device of patent document 1 is generally expensive, and is difficult to be applied to a water treatment device installed in a household.

Disclosure of Invention

The present invention has been made in view of the problems of the prior art. The present invention aims to provide a chemical supply device capable of supplying a fixed amount of chemical to water to be treated without using expensive equipment such as a fixed displacement pump, and a water purification system using the chemical supply device.

In order to solve the above problem, a medicine supply device according to a first aspect of the present invention includes: a drug storage unit that includes a membrane permeable to a drug and a membrane support unit that supports the membrane, and stores the drug; a water supply unit for supplying water to be treated to the membrane; a mixing section for mixing the water to be treated supplied from the water supply section with the chemical impregnated in the membrane; and a discharge unit configured to discharge the water to be treated mixed with the chemical.

A water purification system according to a second aspect of the present invention includes: a medicine supply device; a first bypass pipe provided with a drug supply device; and a main pipe arranged in parallel with the first bypass pipe, and connecting a pump arranged upstream of the medicine supply device to a filter arranged downstream of the medicine supply device.

Drawings

Fig. 1 is a sectional view showing an example of a medicine supply device according to embodiment 1.

Fig. 2 is a sectional view showing an example of the medicine supply device according to embodiment 2.

Fig. 3 is a cross-sectional view showing an example of a medicine supply device according to embodiment 3.

Fig. 4 is a sectional view showing an example of a medicine supply device according to embodiment 4.

Fig. 5 is a sectional view showing an example of a medicine supply device according to embodiment 5.

Fig. 6 is a sectional view showing an example of a medicine supply device according to embodiment 6.

Fig. 7 is a schematic diagram showing an example of the water purification system according to embodiment 1.

Fig. 8 is a schematic diagram showing an example of the water purification system according to embodiment 2.

Fig. 9 is a schematic diagram showing an example of the water purification system according to embodiment 3.

Fig. 10 is a schematic diagram showing an example of the water purification system according to embodiment 4.

Fig. 11 is a schematic diagram showing an example of the water purification system according to embodiment 5.

Fig. 12 is a sectional view of the medicine supplying apparatus used in example 1.

Fig. 13 is a schematic diagram showing the structure of a water purification system used in example 1.

Fig. 14 is a schematic diagram showing the configuration of a water purification system used in comparative example 1.

Fig. 15 is a schematic diagram showing the structure of a water purification system used in comparative example 2.

Fig. 16 is a graph showing the relationship between the operating time and the turbidity with respect to water purified by the water purification systems of the examples and comparative examples.

Detailed Description

The medicine supply device of the present embodiment will be described in detail below. In some cases, the dimensional ratios in the drawings are exaggerated for convenience of explanation and are different from actual ratios. In this specification, water or rainwater drawn from a water source such as a well, a river, or a pond, the water quality of which is improved by a water purification system, is referred to as "treated water". The water to be treated purified by improving the water quality is referred to as "purified water".

[ drug supply device 1]

The medicine supply device 1 of the present embodiment will be described with reference to the medicine supply devices 1A to 1F of embodiments 1 to 6, but the present embodiment is not limited to these embodiments.

(embodiment mode 1)

The medicine supply device 1A of the present embodiment will be described with reference to fig. 1. The medicine supply device 1A of the present embodiment includes a medicine storage unit 2, a water supply unit 3, a mixing unit 4, and a discharge unit 5.

The medicine supply device 1A of the present embodiment includes an outer storage portion 10. In the outer housing portion 10, the medicine housing portion 2, the water supply portion 3, and the mixing portion 4 are housed. The outer housing portion 10 includes a lid portion 10a, a side portion 10b, and a bottom portion 10 c. The shape of the side portion 10b is not particularly limited, and in the present embodiment, the side portion is formed in a substantially cylindrical shape, and the bottom portion 10c is provided so as to cover one open portion, and the lid portion 10a is provided so as to be detachable from the other open portion. Further, an introduction portion 11 for introducing the water to be treated and a discharge portion 5 for discharging the water to be treated to which the chemical 8 is supplied are provided outside the outer housing portion 10 with respect to the bottom portion 10 c.

The medicine reservoir 2 includes a film 6 and a film support 7. The medicine reservoir 2 contains the medicine 8. In the embodiment of fig. 1, the medicament 8 is contained in the space formed by the membrane 6 and the membrane support 7.

The membrane support portion 7 supports the membrane 6. In embodiment 1, the membrane support portion 7 is formed in a cylindrical shape, and the length of the side wall of the membrane support portion 7 is substantially the same at any position on the circumference. The open portion at one end of the membrane support 7 is entirely covered with the membrane 6.

The membrane 6 is permeable to the medicament 8. The drug 8 permeates the membrane 6 to hold the drug 8 inside the membrane 6. Therefore, by supplying the water to be treated to the membrane 6, the chemical 8 is mixed by being brought into contact with the water to be treated. The membrane 6 is not particularly limited as long as the drug 8 can permeate therethrough, and the membrane 6 preferably has pores having a pore diameter larger than the size of molecules of the active ingredient contained in the drug 8. By setting the pore diameter of the membrane to such a size, an appropriate amount of the active ingredient contained in the drug 8 can be retained in the membrane 6. More preferably, the membrane 6 has pores having a pore diameter of 0.01 to 10 μm. By setting the pore diameter of the membrane 6 to 0.01 μm or more, the concentration of the chemical 8 in the water to be treated can be quickly set to an appropriate concentration. Further, by setting the pore diameter of the membrane 6 to 10 μm or less, the excessive supply of the chemical 8 can be suppressed.

The material for forming the membrane 6 is not particularly limited, and preferably at least 1 selected from the group consisting of ceramics such as cellulose acetate, polyacrylonitrile, polysulfone, polyethersulfone, polyethylene, polypropylene, polyvinylidene fluoride, and alumina. Among them, from the viewpoint of ease of cleaning, flexibility, ease of handling, and the like, the material forming the film 6 is preferably cellulose acetate. Specific examples of the Membrane 6 include an MF Membrane (Microfiltration Membrane) and an UF Membrane (ultrafitrationmembrane).

The thickness of the film 6 is not particularly limited, but is preferably 1 μm to 100. mu.m. By setting the thickness of the film 6 to 1 μm or more, breakage of the film can be suppressed. Further, by setting the thickness of the membrane 6 to 100 μm or less, the chemical 8 can be smoothly supplied to the water to be treated.

The medicine storage portion 2 is preferably detachable from the medicine supply device 1A. By making the medicine storage portion 2 detachable from the medicine supply device 1A, the medicine 8 can be replenished to the medicine storage portion 2 outside the medicine supply device 1A. Further, by making the medicine storage unit 2 detachable from the medicine supply device 1A, the replacement medicine storage unit 2 to which the medicine 8 is replenished and the medicine storage unit 2 in which the remaining amount of the medicine 8 is reduced can be easily replaced.

The chemical 8 is not particularly limited as long as it contains an active ingredient that contributes to the treatment of the water to be treated. Examples of the chemical agent 8 include an oxidizing agent and a coagulant.

The oxidizing agent oxidizes metal ions in the water to be treated. Specifically, the method has an effect of oxidizing ferrous ions contained in the water to be treated into ferric ions. The ferrous ion is sometimes oxidized by oxygen in the air to gradually change into Fe (OH) which is hardly soluble in water₃、Fe₂O₃And the like, and thus precipitated in domestic water. Thus, the vector is processedThe addition of an oxidizing agent to water can forcibly oxidize divalent iron ions dissolved in water to trivalent iron ions, thereby forming a colloid that is hardly soluble in water. In addition, although iron is exemplified, the metal ion oxidized by the oxidizing agent is not limited to iron.

The oxidizing agent preferably contains ozone or chlorine so that it can be easily added to the water to be treated and efficiently oxidize the metal ions. Among them, chlorine-based agents are preferable as the oxidizing agent. As the chlorine-based chemical, at least one selected from the group consisting of sodium hypochlorite, calcium hypochlorite, and chlorinated isocyanuric acid can be used. As calcium hypochlorite, at least one of bleaching powder (available chlorine 30%) and high bleaching powder (available chlorine 70%) can be used. As the chlorinated isocyanuric acid, at least one selected from the group consisting of sodium trichloroisocyanurate, potassium trichloroisocyanurate, sodium dichloroisocyanurate, and potassium dichloroisocyanurate can be used. Among them, sodium hypochlorite is a liquid, and can be added to water to be treated in a fixed amount by an injection method using a fixed displacement pump, and therefore, it can be particularly preferably used. In addition, inorganic high-grade bleaching powders have very high solubility in water to be treated, and therefore can exhibit a high oxidizing effect.

The flocculant is capable of forming flocs by aggregating colloids and the like formed by the oxidizing agent. The flocs formed can be easily removed with a filtration apparatus or the like. The flocculant is not particularly limited, and examples thereof include an aluminum flocculant and an iron flocculant. Examples of the aluminum-based coagulant include aluminum chloride and aluminum sulfate. Examples of the iron-based coagulant include ferrous sulfate (FeSO)₄) Iron (Fe) sulfate₂(SO₄)₃) Iron chloride (FeCl)₃) And iron polysulfate ([ Fe ]₂(OH)_n(SO₄)_3－n/2]_m) And a polysilicate iron flocculant ([ SiO ]₂]_n·[Fe₂O₃]) And the like.

The state of the drug 8 is not particularly limited, and may be a solid drug or a liquid drug. The shape of the solid pharmaceutical preparation is not particularly limited. Examples of the solid pharmaceutical preparation include tablets, granules and the like.

In the case of a solid chemical, the water to be treated supplied from the water supply unit 3 penetrates into the membrane 6, and dissolves the solid chemical in contact with the membrane 6. The solid drug dissolved in the water to be treated is held in the membrane 6 as a liquid drug containing an active ingredient. The contact between the water to be treated supplied from the water supply unit 3 and the membrane 6 causes the chemical agent 8 and the water to be treated to be mixed.

The water supply unit 3 supplies the water to be treated to the membrane 6. The water supply unit 3 is disposed on the opposite side of the membrane 6 from the chemical agent 8. By supplying the water to be treated to the membrane 6, the chemical 8 held in the membrane 6 is mixed by being brought into contact with the water to be treated. In embodiment 1, the water supply unit 3 is arranged to supply the water to be treated to the substantially central portion in the radial direction of the drug storage unit 2 so that the amount of the water to be treated contacting the membrane 6 increases. The water supply portion 3 is connected to the bottom portion 10c at a substantially center portion in the radial direction of the mixing portion 4. The water supply unit 3 is not particularly limited as long as it can supply the water to be treated to the membrane 6, and for example, a nozzle or the like can be used.

The water supply portion 3 includes a supply port 3a, a side portion 3b, and a discharge port 3 c. The side portion 3b is formed so that the introduction portion 11 and the water supply portion 3 communicate with each other through the supply port 3 a. The water to be treated introduced from the introduction portion 11 is discharged from the discharge port 3c through the supply port 3a, and the water to be treated is supplied to the membrane 6. In embodiment 1, the water supply unit 3 is linear, but the shape of the water supply unit 3 is not particularly limited.

The water supply unit 3 is disposed with a gap between the membrane 6 and the water supply unit 3 in the thickness direction of the membrane 6. Although not particularly limited, the water supply unit 3 is disposed such that the thickness direction of the membrane 6 is substantially parallel to the supply direction of the water to be treated supplied from the water supply unit 3. The supply direction of the water to be treated here means the discharge direction of the water to be treated at the tip of the water supply unit 3. Here, the film 6 may be substantially parallel to each other, or may be inclined in the thickness direction by about ± 15 degrees with respect to the supply direction of the water to be treated supplied from the water supply unit 3.

Preferably, the supply amount of the water to be treated supplied from the water supply unit 3 is a supply amount at which the water to be treated can contact the membrane 6. This is because the water to be treated can be mixed with the chemical 8 in the mixing section 4 by bringing the water to be treated into contact with the membrane 6. Specifically, the flow rate of the water to be treated is preferably 8 to 10cm/s, and the gap between the membrane 6 side tip of the water supply unit 3 and the membrane is preferably 5 to 10 mm. By setting the flow rate of the water to be treated and the gap between the tip of the water supply unit 3 and the membrane 6 to the above ranges, the water to be treated can be brought into contact with the membrane and damage to the membrane 6 due to the water to be treated can be suppressed.

Preferably, a pedestal 9 smaller than the membrane 6 in the plane direction of the membrane 6 is provided at the tip of the water supply unit 3. By providing such a pedestal 9, the water to be treated supplied from the water supply unit 3 passes between the pedestal 9 and the membrane 6, and therefore, the water to be treated can be maintained in contact with the membrane 6 for a long time. Therefore, the supply amount of the chemical 8 to the water to be treated can be further kept constant. The distance between the top surface of the pedestal portion 9 and the bottom surface of the film 6 is preferably 2mm to 10 mm. By setting the distance between the pedestal portion 9 and the membrane 6 to such a range, the membrane 6 can be brought into contact with the water to be treated more stably. Further, the distance between the inner wall of the mixing section 4 and the radially outer side of the pedestal section 9 is preferably 2mm to 10 mm. By setting the distance between the mixing section 4 and the pedestal section 9 to such a range, not only the water to be treated is brought into stable contact with the membrane 6, but also the water to be treated to which the chemical 8 is supplied can be smoothly discharged.

The seat 9 has a hole at a substantially central portion in cross section, and is connected to the tip of the water supply unit 3 so as to communicate with the water supply unit 3. The base 9 is formed in a circular shape in a plan view, expanding outward from a hole at a substantially central portion in a cross-sectional view. Although not shown, a projection for supporting the film 6 may be provided on the surface of the pedestal portion 9. By providing such a protrusion on the pedestal portion 9, the film 6 can be supported by the protrusion so that the film 6 does not loosen.

The mixing unit 4 mixes the water to be treated supplied from the water supply unit 3 with the chemical 8 impregnated in the membrane 6. The shape of the mixing section 4 is not particularly limited, and in the present embodiment, the mixing section 4 is disposed such that: the membrane 6 is sandwiched between the membrane support 7 and the mixing section 4. In the present embodiment, the water supply unit 3 is disposed inside the mixing unit 4. Then, in the space formed by the mixing section 4 and the membrane 6, the water to be treated is supplied from the water supply section 3 to the membrane 6 holding the chemical 8, and the water to be treated and the chemical 8 are mixed in the mixing section 4. Then, the water to be treated mixed with the chemical 8 moves from the mixing unit 4 to the discharge unit 5.

The discharge unit 5 discharges the water to be treated mixed with the chemical 8. The water to be treated containing the chemical 8 discharged from the discharge unit 5 is filtered by, for example, a filter device, and used as domestic water by a user. The discharge unit 5 may be provided with a drain plug 12 for discharging the water to be treated accumulated in the discharge unit 5.

(embodiment mode 2)

Next, a medicine supply device 1B according to embodiment 2 will be described with reference to fig. 2. The same components as those in the above embodiment are assigned the same reference numerals, and redundant description is omitted. In the chemical supply device 1B according to embodiment 2, the film 6 is disposed in a thickness direction inclined with respect to the supply direction of the water to be treated supplied from the water supply unit 3. That is, the membrane 6 is disposed so that the thickness direction thereof is not parallel to the supply direction of the water to be treated supplied from the water supply unit 3. Specifically, the thickness direction of the membrane 6 is arranged obliquely to the extending direction of the water supply unit 3.

By inclining the membrane 6 in this manner, the membrane 6 is less likely to contact the water to be treated above the point where the water to be treated contacts, and the water to be treated is likely to drip and spread below the point where the water to be treated contacts. Therefore, the contact area between the membrane 6 and the water to be treated can be easily changed by controlling the height of spraying the water to be treated, the flow rate of the water to be treated, and the like. Specifically, if the height to which the water to be treated is sprayed is increased, the contact area of the membrane 6 with the water to be treated can be enlarged. Further, if the height to be sprayed with the treated water is reduced, the contact area of the membrane 6 with the treated water can be reduced. Therefore, the concentration of the chemical 8 in the water to be treated can be easily changed by a simple method of controlling the flow rate of the water to be treated.

In addition, the thickness direction of the film is preferably inclined at 45 to 89 degrees with respect to the supply direction of the water to be treated supplied from the water supply unit 3. By setting the inclination of the membrane 6 in such a range, the contact area between the membrane 6 and the water to be treated can be easily adjusted. The inclination of the membrane 6 is preferably in a range not exceeding 89 degrees, because the contact area between the membrane 6 and the water to be treated can be easily adjusted when the inclination of the membrane 6 is large.

(embodiment mode 3)

Next, a medicine supply device 1C according to embodiment 3 will be described with reference to fig. 3. The same components as those in the above embodiment are assigned the same reference numerals, and redundant description is omitted. In the chemical supply device 1C according to embodiment 3, the film 6 is disposed in a thickness direction inclined with respect to the supply direction of the water to be treated supplied from the water supply unit 3, as in embodiment 2. In addition, in the medicine supply device 1C according to embodiment 3, the water supply unit 3 is disposed outside the mixing unit 4 in the radial direction substantially at the center. Further, in the medicine supply device 1C according to embodiment 3, the distal end portion of the water supply portion 3 on the membrane 6 side is bent toward the radial center side of the mixing portion 4 to form a bent portion 3 d.

In this way, in the medicine supply device 1C according to embodiment 3, the distal end portion of the water supply portion 3 is curved. Therefore, by combining the inclination of the membrane 6 and the inclination by the curvature of the water supply portion 3, the contact area between the membrane 6 and the water to be treated can be changed, and the concentration of the chemical 8 in the water to be treated can be more finely controlled. Further, by bending the leading end of the water supply part 3, the positional relationship in the height direction between the membrane 6 and the leading end of the water supply part 3 is adjusted, whereby the contact area between the membrane 6 and the water to be treated can be easily changed. The angle of the bent portion 3d formed by bending the distal end portion of the water supply portion 3 is preferably 135 degrees or more and less than 180 degrees. By setting the angle of the bent portion 3d in such a range, the height of the water to be treated in the water supply portion 3 can be made sufficient, and the contact area between the membrane 6 and the water to be treated can be increased. The case where the angle of the bent portion 3d is 180 degrees corresponds to the case where the water supply portion 3 is linear.

Preferably, the distal end of the water supply unit 3 is curved, and the medicine housing unit 2 is rotatably provided. By rotatably installing the chemical storage portion 2 with respect to the chemical supply device 1C, the angle formed by the film 6 and the supply direction of the water to be treated can be changed not only by the height of the water to be treated but also by a simple method of rotating the chemical storage portion 2. Therefore, the contact area between the membrane 6 and the water to be treated can be controlled, and the concentration of the chemical 8 supplied to the water to be treated can be controlled more easily and finely.

(embodiment mode 4)

Next, a medicine supply device 1D according to embodiment 4 will be described with reference to fig. 4. The same components as those in the above embodiment are assigned the same reference numerals, and redundant description is omitted. In embodiment 4, as in

embodiments

2 and 3, the thickness direction of the membrane 6 is arranged obliquely with respect to the supply direction of the water to be treated supplied from the water supply unit 3. However, in embodiment 4, a part of the medicine reservoir 2 is housed inside the mixing section 4.

Therefore, it is not necessary to change the length of the side walls of the medicine storage unit 2 and the mixing unit 4 in the circumferential direction as in embodiment 2, and it is possible to use the medicine storage unit 2 and the mixing unit 4 having independent shapes such as a cylindrical shape or a rectangular parallelepiped shape. In addition, with such a simple configuration, as in

embodiments

2 and 3, the concentration of the chemical 8 in the water to be treated can be easily changed by a simple method of controlling the flow rate of the water to be treated. Further, by rotatably providing the chemical storage portion 2, the concentration of the chemical 8 supplied to the water to be treated can be controlled more easily and finely as in embodiment 3.

(embodiment 5)

Next, a medicine supply device 1E according to embodiment 5 will be described with reference to fig. 5. The same components as those in the above embodiment are assigned the same reference numerals, and redundant description is omitted. In the medicine supply device 1E according to embodiment 5, the distal end portion of the water supply unit 3 is bent in the medicine supply device 1D according to embodiment 4, similarly to embodiment 3. Specifically, in the drug supply device 1E according to embodiment 5, the distal end portion of the water supply unit 3 on the membrane 6 side is bent toward the radial center of the mixing unit 4 to form the bent portion 3 d.

By inclining the membrane 6 and the water supply portion 3, as in embodiment 3, the contact area between the membrane 6 and the water to be treated can be changed by a combination of the inclination of the membrane 6 and the inclination by the bending of the water supply portion 3, and the concentration of the chemical 8 in the water to be treated can be more finely controlled. Further, by bending the distal end of the water supply portion 3, the positional relationship in the height direction between the membrane 6 and the distal end of the water supply portion 3 is adjusted, and the contact area between the membrane 6 and the water to be treated can be easily changed.

(embodiment mode 6)

Next, a medicine supply device 1F according to embodiment 6 will be described with reference to fig. 6. The same components as those in the above embodiment are assigned the same reference numerals, and redundant description is omitted. In the medicine supply device 1F according to embodiment 6, the film 6 is not entirely covered on the lower surface of the film support portion 7, and only a part of the lower surface of the film support portion 7 is covered with the film 6. Further, a part of the membrane support portion 7 not covered with the membrane 6 forms a bottom portion 2a in which the medicine 8 does not permeate, and is formed so that the medicine 8 does not permeate.

Moreover, since the inclination of the membrane 6 can be increased by inclining only a part of the membrane 6, the concentration of the chemical 8 in the water to be treated can be more easily adjusted by the discharge height of the water to be treated. In addition, by inclining only a part of the film 6, the amount of the medicine 8 that can be stored in the medicine reservoir portion 2 can be increased.

As described above, the medicine supply device of the present embodiment includes: a drug storage unit that includes a membrane permeable to a drug and a membrane support unit that supports the membrane, and stores the drug; and a water supply unit for supplying the water to be treated to the membrane. The medicine supply device further includes: a mixing section for mixing the water to be treated supplied from the water supply section with the chemical impregnated in the membrane; and a discharge unit configured to discharge the water to be treated mixed with the chemical.

In the chemical supply device of the present embodiment, the water to be treated is supplied to the membrane in which the chemical can permeate. Therefore, the chemical is supplied in accordance with the flow rate of the water to be treated. The water to be treated and the chemical are mixed in the mixing section. Therefore, the water to be treated and the chemical agent are uniformly mixed at a certain concentration. Therefore, according to the chemical supply device of the present embodiment, the chemical can be quantitatively mixed into the water to be treated with a simple configuration. Therefore, a fixed amount of chemical can be supplied to the water to be treated without using expensive equipment such as a fixed displacement pump.

[ Water purification System 100]

The water purification system 100 of the present embodiment will be described with reference to embodiments 1 to 5, but the present embodiment is not limited to these embodiments.

(embodiment mode 1)

First, a water purification system 100A according to embodiment 1 will be described with reference to fig. 7. In the water purification system 100A of the present embodiment, the chemical supply device 1 described above can be used. By using such a chemical supply device 1, a fixed amount of chemical can be supplied to the water to be treated without using expensive equipment such as a fixed displacement pump. Specifically, the water purification system 100A of the present embodiment includes the chemical supply device 1, the first bypass pipe 132, and the main pipe 150.

As shown in fig. 7, one of the main pipes 150 is immersed in well water, and the other is connected to a water tap or the like inside the building. The main pipe 150 is provided with a pump 110 for pumping up the water to be treated (well water) from the well, and a filter device 140 for filtering turbid components contained in the water to be treated.

Main piping 150 connects pump 110 to filter device 140. The water to be treated pumped up by the pump 110 and passing through the main pipe 150 passes through the filter device 140 and is used as domestic water by the user.

The pump 110 is disposed upstream of the medicine supply device 1. The pump 110 is not particularly limited as long as it can pump up the water to be treated and send the water to the water purification system 100A. As the pump 110, for example, an automatic pump having a built-in pressure switch can be used.

As shown in fig. 7, in the water purification system 100A, an example is shown in which an oxidizing agent and a flocculant are added to water to be treated drawn up from well water by a pump 110 and passed through a main pipe 150, and the aggregate is filtered by a filter device 140. As shown in fig. 7, the oxidizing agent is supplied from the oxidizing agent supply device 121, and the coagulant is supplied from the coagulant supply device 131. Further, the medicine supply device 1 may be the oxidizing agent supply device 121, but in the present embodiment, an example in which the medicine supply device 1 is the coagulant supply device 131 is described.

The oxidizing agent supply device 121 supplies an oxidizing agent to the water to be treated. The oxidizing agent supply device 121 is provided in the second bypass pipe 122. Main pipe 150 is arranged in parallel with second bypass pipe 122. An upstream end of the second bypass pipe 122 is connected to the main pipe 150 at a connection portion 123. Further, a downstream end of the second bypass pipe 122 is connected to the main pipe 150 at a connection portion 124. Part of the water to be treated pumped up by the pump 110 and passing through the main pipe 150 passes through the second bypass pipe 122 via the connection portion 123 and is supplied to the oxidizing agent supply device 121. The water to be treated to which the oxidizing agent is supplied from the oxidizing agent supply device 121 passes through the second bypass pipe 122 and returns to the main pipe 150 through the connection portion 124.

The flocculant supply device 131 supplies a flocculant to the water to be treated to which the oxidizing agent is supplied. As described above, in the present embodiment, the medicine supply device is the coagulant supply device 131. The coagulant supply device 131 (the drug supply device 1) is provided in the first bypass pipe 132. The main pipe 150 is arranged in parallel with the first bypass pipe 132. The flocculant supply device 131 supplies the flocculant to the water to be treated to which the oxidizing agent is supplied from the oxidizing agent supply device 121. The aggregating agent is used for aggregating the metal component gelatinized by the action of the oxidizing agent. An upstream end of the first bypass pipe 132 is connected to the main pipe 150 at the connection portion 133. A downstream end of the first bypass pipe 132 is connected to the main pipe 150 at a connection portion 134. Part of the water to be treated, to which the oxidizing agent is supplied and which passes through the main pipe 150, passes through the first bypass pipe 132 via the connection portion 133, and is supplied to the flocculant supply device 131. The water to be treated to which the coagulant is supplied by the coagulant supply device 131 passes through the first bypass pipe 132 and returns to the main pipe 150 via the connection portion 134.

In the flocculant supply device 131, the water to be treated is fed from the inlet 11 to the water supply unit 3 as described above. The water to be treated is supplied from the water supply unit 3 to the film 6 of the chemical storage unit 2, and is mixed with the flocculant (chemical 8) in the mixing unit 4. The water to be treated mixed with the flocculant is discharged from the discharge portion 5 and returned to the main pipe 150.

In the present embodiment, as described above, the coagulant supply device 131 is provided in the first bypass pipe 132. Therefore, for example, even when the variation in the flow rate of the water used by the user increases, the main pipe 150 and the first bypass pipe 132 can suppress the variation in the flow rate of the water to be treated passing through the flocculant supply device 131. Therefore, the concentration of the chemical 8 supplied to the water to be treated can be further controlled to be constant. Further, since the fluctuation of the flow rate is suppressed, the treated water having a strong momentum is less likely to be supplied to the membrane 6, and therefore, the damage of the membrane 6 can be suppressed. Further, since the fluctuation of the flow rate is suppressed, it is possible to suppress the air in the flocculant supply device 131 from being discharged to the outside by the momentum of the water flow and to suppress the flocculant supply device 131 from being filled with the water to be treated.

The pressure adjusting portion 125 may be provided inside the main pipe 150 between the

connection portions

123 and 124. Similarly, the pressure adjusting unit 135 may be provided inside the main pipe 150 between the

connection units

133 and 134. The

pressure adjusting portions

125 and 135 can adjust the flow rate of the water to be treated flowing through the second bypass pipe 122 and the first bypass pipe 132 by narrowing the flow path through which the water to be treated passes and generating a water pressure difference between the front and rear sides thereof. The pressure adjusting unit 125 and the pressure adjusting unit 135 are not particularly limited as long as the flow rate of the water to be treated can be adjusted. The pressure adjusting unit 125 and the pressure adjusting unit 135 may be an on-off valve, an orifice, a venturi tube, or the like.

The flow rate adjusting portion 126 and the flow rate adjusting portion 136 may be provided in the second bypass pipe 122 and the first bypass pipe 132, respectively. The flow

rate adjusting portions

126 and 136 can adjust the flow rate of the water to be treated flowing through the second bypass pipe 122 and the first bypass pipe 132. As the flow rate adjusting portion 126 and the flow rate adjusting portion 136, for example, an on-off valve can be used.

Filtration device 140 to agglutinationThe agent supply device 131 (agent supply device 1) is disposed on the downstream side. The filter device 140 can remove turbid components and the like aggregated from the water to be treated to which the flocculant is supplied, and can produce purified water for use by the user. In the present embodiment, the filter device 140 includes a sand filter 141. The sand filter can be formed of sand such as manganese sand, for example. The density of the manganese sand can be set to, for example, 2.57g/cm³～2.67g/cm³. The manganese content of the manganese sand is preferably 0.3mg/g or more. However, the filter device 140 may be made of ordinary filter sand (2.5 g/cm)³) And (4) forming.

(embodiment mode 2)

Next, a water purification system 100B according to embodiment 2 will be described with reference to fig. 8. The same components as those in the above embodiment are assigned the same reference numerals, and redundant description is omitted. In embodiment 2, the main pipe 150 is arranged in parallel with the first bypass pipe 132. Further, the main pipe 150 is arranged in parallel with the second bypass pipe 122. Further, the second bypass pipe 122 is disposed in parallel with the first bypass pipe 132.

An upstream end of the second bypass pipe 122 is connected to the main pipe 150 at a connection portion 123. A downstream end of the second bypass pipe 122 is connected to the main pipe 150 at a connection portion 124. An upstream end of the first bypass pipe 132 is connected to an upstream side of the oxidizing agent supply device 121 in the second bypass pipe 122 at a connection portion 133. The downstream end of the first bypass pipe 132 is connected to the downstream side of the oxidizing agent supply device 121 in the second bypass pipe 122 at a connection portion 134.

Part of the water to be treated pumped up by the pump 110 and passing through the main pipe 150 is supplied to the second bypass pipe 122. Part of the water to be treated passing through the second bypass pipe 122 passes through the first bypass pipe 132 via the connection portion 133 and is supplied to the coagulant supply device 131. The water to be treated to which the coagulant is supplied by the coagulant supply device 131 passes through the first bypass pipe 132 and returns to the second bypass pipe 122 via the connection portion 134.

Meanwhile, a part of the water to be treated passing through the second bypass pipe 122 is supplied to the oxidizing agent supply device 121. The water to be treated to which the oxidizing agent is supplied and the water to be treated to which the aggregating agent is supplied are merged at the connection portion 134. In the second bypass pipe 122 downstream of the connection portion 134, the water to be treated to which the oxidizing agent is supplied and the water to be treated to which the coagulant is supplied are mixed and returned to the main pipe 150 via the connection portion 124.

In embodiment 2, by providing such a configuration, it is not necessary to use the 2 pressure adjusting portions 135 used in embodiment 1. Therefore, a water purification system with lower manufacturing costs can be provided.

(embodiment mode 3)

Next, a water purification system 100C according to embodiment 3 will be described with reference to fig. 9. The same components as those in the above embodiment are assigned the same reference numerals, and redundant description is omitted. In embodiment 3, in addition to embodiment 2, a check valve 137 for preventing reverse flow of the water to be treated is provided downstream of the flocculant supply device 131 in the first bypass pipe 132.

In embodiment 3, by providing such a check valve 137, even when the water to be treated flows in a direction opposite to the original flow direction due to the balance of the valve opening degree or the like, the water to be treated containing the oxidizing agent can be prevented from flowing backward to the flocculant supply device 131. Therefore, even when a material having low resistance to an oxidizing agent is used for the film 6 of the flocculant supply device 131, the flocculant supply device 131 can be prevented from being oxidatively deteriorated. In addition, even in the case where harmful chlorine gas or the like is generated if the oxidizing agent reacts with the coagulant, the generation of such gas can be suppressed.

(embodiment mode 4)

Next, a water purification system 100D according to embodiment 4 will be described with reference to fig. 10. The same components as those in embodiment 1 are denoted by the same reference numerals, and redundant description thereof is omitted. In embodiment 4, the upstream side of the first bypass pipe 132 is connected to the second bypass pipe 122. Further, the downstream side of the first bypass pipe 132 is connected to the main pipe 150. Further, the downstream side of the second bypass pipe 122 is connected to the main pipe 150. Further, the connection portion 124 between the downstream side of the first bypass pipe 132 and the main pipe 150 is arranged at a position different from the connection portion 134 between the downstream side of the second bypass pipe 122 and the main pipe 150.

Specifically, an upstream end of the second bypass pipe 122 is connected to the main pipe 150 at a connection portion 123. A downstream end of the second bypass pipe 122 is connected to the main pipe 150 at a connection portion 124. Further, an upstream end of the first bypass pipe 132 is connected to the second bypass pipe 122 at a connection portion 133. A downstream end of the first bypass pipe 132 is connected to the main pipe 150 at a connection portion 134.

In embodiment 4, the connection portion 124 between the downstream side of the first bypass pipe 132 and the main pipe 150 is connected at a position different from the connection portion 134 between the downstream side of the second bypass pipe 122 and the main pipe 150. Therefore, the coagulant is less likely to be mixed into the second bypass pipe 122, and the reaction between the oxidant and the coagulant can be suppressed. Since such side reactions are suppressed, metal ions in the water to be treated can be sufficiently oxidized in the second bypass pipe 122.

The connection portion 124 between the downstream side of the first bypass pipe 132 and the main pipe 150 is preferably disposed upstream of the connection portion 134 between the downstream side of the second bypass pipe 122 and the main pipe 150. The metal ions in the water to be treated are easily aggregated by the aggregating agent in an oxidized state. Therefore, by adopting such an arrangement, the metal component that is oxidized to be in a colloidal state can be aggregated, and the efficiency of removing the turbid component can be improved.

(embodiment 5)

Next, a water purification system 100E according to embodiment 5 will be described with reference to fig. 11. The same components as those in the above embodiment are assigned the same reference numerals, and redundant description is omitted. In embodiment 5, in addition to embodiment 4, a check valve 137 for preventing reverse flow of the water to be treated is provided downstream of the flocculant supply device 131 in the first bypass pipe 132.

In embodiment 5, by providing such a check valve 137, even when the water to be treated flows in the reverse direction due to the balance of the valve opening degree or the like, the water to be treated containing the oxidizing agent can be prevented from flowing back to the flocculant supply device 131. Therefore, even when a material having low resistance to an oxidizing agent is used for the film 6 of the flocculant supply device 131, the flocculant supply device 131 can be prevented from being oxidatively deteriorated. In addition, even in the case where harmful chlorine gas or the like is generated if the oxidizing agent reacts with the coagulant, the generation of such gas can be suppressed.

As described above, the water purification system according to the present embodiment includes the chemical supply device and the first bypass pipe provided with the chemical supply device. The water purification system further includes a main pipe arranged in parallel with the first bypass pipe, and a pump arranged upstream of the chemical supply device is connected to a filter arranged downstream of the chemical supply device.

Therefore, for example, even when the flow rate of water used by the user varies greatly, it is possible to suppress an excessive amount of water to be treated from being supplied to the chemical supply device. Further, since the water purification system of the present embodiment uses the chemical supply device of the above-described embodiment, a fixed amount of chemical can be supplied to the water to be treated without using expensive equipment such as a fixed-amount pump.

Examples

The operation of the medicine supply device according to the present embodiment will be described in more detail below with reference to examples, but the present embodiment is not limited to these examples.

[ example 1]

In example 1, the performance of removing the turbid component was confirmed using the coagulant supply device 231 (chemical supply device) shown in fig. 12 and the water purification system 200 shown in fig. 13.

As shown in fig. 12, the coagulant supply device 231 has substantially the same configuration as the medicine supply device 1A shown in fig. 1, except that it does not have a pedestal portion. The height of the coagulant supply device 231 is 300mm, and the inner diameter of the outer housing part 60 is 125 mm. A coagulant supply device 231 is disposed inside the outer housing portion 60.

The coagulant supply device 231 includes a medicine storage portion 52 having an inner diameter of 52mm and a height of 100mm, and the medicine 58 is stored in the medicine storage portion 52. As the chemical 58, a liquid coagulant having a polyaluminum chloride concentration of 11% was used. The drug storage part 52 is provided with a film 56, and the average pore diameter of pores of the film 56 is 0.45 μm.

A mixing section 54 having a height of 100mm is provided below the medicine storage section 52, and a water supply section 53 having an inner diameter of 20mm is provided inside the mixing section 54. The water to be treated was supplied from the water supply portion 53 to the membrane 56 at a flow rate of 2.0L/min, mixed with the flocculant in the mixing portion 54, and discharged from the discharge portion 55. Further, the distance between the bottom surface of the membrane 56 and the tip of the water supply part 53 is 5 mm.

As shown in fig. 13, the water purification system 200 includes a water tank 250 for storing water to be treated, an oxidizing agent supply tank 221 for supplying an oxidizing agent, a coagulant supply device 231 for supplying a coagulant, and a filter device 240. The water to be treated in the water tank 250 is fed at a flow rate of 2.0L/min by the feed pump 210.

The water to be treated is supplied to the coagulant supply device 231. Further, a flow meter 255 for measuring the flow rate of the water to be treated is provided upstream of the supply pump 210. Porcelain clay is added to the treated water in the water storage tank 250 to make the Turbidity 100ntu (nephelometric turbidimetry unit).

The oxidizing agent supply tank 221 is provided upstream of the coagulant supply device 231 and downstream of the supply pump 210, and supplies the oxidizing agent to the fixed displacement pump 228 so that the chlorine concentration of the water to be treated becomes 10 ppm.

The filter device 240 is disposed downstream of the coagulant supply device 231. A cylindrical vessel having an inner diameter of 100mm and a length of 715mm was used as the filter device 240. In the filter apparatus, 400mL of activated carbon having a mesh size of 20X 50, 1800mL of manganese sand having a particle size of 0.35mm, and 500mL of gravel having a particle size of 4 to 8mm were stacked in this order from the upstream side.

Comparative example 1

As shown in fig. 14, a water purification system 300 was produced in the same manner as in example 1, except that the flocculant supply device 231 was removed.

Comparative example 2

As shown in fig. 15, a water purification system 400 was produced in the same manner as in example 1, except that a coagulant supply tank 239 and a metering pump 238 were used instead of the coagulant supply device 231 to supply the coagulant to the water to be treated.

[ evaluation ]

The removal performance of the china clay as a turbid component was confirmed by measuring the turbidity of the purified water obtained using each water purification system. The measurement results are shown in fig. 16. In the graph of fig. 16, the vertical axis represents the turbidity of the purified water, and the horizontal axis represents the operating time (minutes) of the water purification system.

As shown in fig. 16, when the flocculant is not added, the turbidity cannot be sufficiently reduced as in the water purification system 300 of comparative example 1. On the other hand, the purified water obtained by the water purification system 200 of example 1 can reduce the turbidity to the same extent as the purified water obtained by the water purification system 400 of comparative example 2. Therefore, in the case of using the flocculant supplying apparatus 231 as in example 1, it was confirmed that: even if expensive equipment such as a fixed displacement pump is not used, a fixed amount of chemical can be supplied to the water to be treated.

The entire contents of Japanese patent application No. 2017-163419 (application date: 8/28/2017) are incorporated herein by reference.

The present embodiment has been described above, but the present embodiment is not limited to these descriptions, and various modifications and improvements will be apparent to those skilled in the art.

Industrial applicability

According to the present invention, a chemical supply device capable of supplying a fixed amount of chemical to water to be treated without using expensive equipment such as a fixed displacement pump, and a water purification system using the chemical supply device can be obtained.

Description of the reference symbols

1. 1A, 1B, 1C, 1D, 1E, 1F medicine supply device

2 medicine storage part

3 water supply part

4 mixing section

5 discharge part

6 film

7 membrane support

8 medicament

100. 100A, 100B, 100C, 100D, 100E water purification system

110 pump

121 oxidizing agent supply device

122 second bypass piping

131 agglutinant supply device (medicine supply device)

132 first bypass piping

137 check valve

140 filter device

150 main pipe

Claims

1. A medicine supply device is characterized in that,

the disclosed device is provided with:

a medicine storage unit including a film permeable to a medicine and a film support unit supporting the film, and storing the medicine;

a water supply unit for supplying water to be treated to the membrane;

a mixing unit for mixing the water to be treated supplied from the water supply unit with the chemical impregnated into the membrane; and

and a discharge unit configured to discharge the water to be treated mixed with the chemical.

2. The medication delivery device according to claim 1,

the membrane has pores whose diameter is larger than the size of molecules of the active ingredient contained in the drug.

3. The medicament supply device according to claim 1 or 2,

the film has pores, and the pore diameter of the pores is 0.01 to 10 μm.

4. The drug supply device according to any one of claims 1 to 3,

the supply amount of the water to be treated supplied from the water supply unit is a supply amount at which the water to be treated can come into contact with the membrane.

5. The drug delivery device according to any one of claims 1 to 4,

the medicine storage part is detachable.

6. The drug delivery device according to any one of claims 1 to 5,

a pedestal portion smaller than the film in a plane direction of the film is provided at a tip of the water supply portion.

7. The drug delivery device according to any one of claims 1 to 6,

the thickness direction of the film is arranged obliquely with respect to the supply direction of the water to be treated supplied from the water supply unit.

8. The drug delivery device according to any one of claims 1 to 7,

the thickness direction of the film is inclined at 45 to 89 degrees with respect to the supply direction of the water to be treated supplied from the water supply unit.

9. The drug delivery device according to any one of claims 1 to 8,

the water supply part has a bent front end.

10. The drug delivery device according to any one of claims 1 to 9,

the water supply unit has a curved distal end portion, and the medicine storage unit is rotatably provided.

11. A water purification system, characterized in that,

the disclosed device is provided with:

a drug delivery device according to any one of claims 1 to 10;

a first bypass pipe provided with the medicine supply device; and

and a main pipe arranged in parallel with the first bypass pipe, and connecting a pump arranged upstream of the medicine supply device to a filter arranged downstream of the medicine supply device.

12. A water purification system according to claim 11,

a second bypass pipe provided with an oxidizing agent supply device for supplying an oxidizing agent to the water to be treated;

the chemical supply device is a coagulant supply device that supplies a coagulant to the water to be treated to which the oxidizing agent is supplied;

an upstream side of the first bypass pipe is connected to the second bypass pipe;

a downstream side of the first bypass pipe is connected to the main pipe;

a downstream side of the second bypass pipe is connected to the main pipe;

a connection portion between a downstream side of the first bypass pipe and the main pipe is disposed at a position different from a connection portion between a downstream side of the second bypass pipe and the main pipe.

13. Water purification system according to claim 11 or 12,

the second bypass pipe is arranged in parallel with the first bypass pipe;

a check valve for preventing a reverse flow of the water to be treated is provided downstream of the flocculant supply device in the first bypass pipe.