JP6429827B2 - Raw water treatment equipment - Google Patents

Description

  The present invention relates to a raw water treatment apparatus that purifies organic substances contained in raw water without adding chemicals.

  As an example of the prior art of the raw water treatment apparatus as described above, the following patent document describes a first magnetic treatment reactor in which a magnetic force is applied to water to be treated and ozone is further injected and stirred, and a first magnetic treatment A first filter that guides the water to be treated from the reactor to remove the agglomerated material, and a second magnet that guides the water to be treated from the first filter to act on the magnetic force, and injects ozone and stirs it A reaction vessel that guides the water to be treated from the treatment reactor, the second magnetic treatment reactor, and performs oxidation / decomposition by a catalyst layer made of activated carbon, and guides the water to be treated from the reaction vessel to remove aggregated substances. A second filter, a treated water storage tank for storing treated water discharged from the second filter, and the treated water in the treated water storage tank are guided through a reverse osmosis membrane or an ultrafiltration membrane. Describes a desalination system (vehicle for desalination) equipped with a filtration unit to obtain drinking water It is. Thereby, the drinking water from which the organic matter has been completely removed is obtained.

Japanese Patent No. 44122794

By the way, recently, water containing oxygen nanobubbles has been found to have unique effects such as allowing freshwater fish and saltwater fish to be bred in the same tank, and various applications are expected. However, the patent document does not mention oxygen nanobubbles. Ozone is generally harmful to the human body and organisms. And in the structure of the said patent document, although it is thought that the ozone inject | poured into the to-be-processed water remains as a bubble or dissolved ozone, it is not described in detail about the ozone removal from to-be-processed water.
On the other hand, the present inventors have intensively studied on a method of generating oxygen nanobubbles in the process of raw water, and as a result, by improving the configuration of the patent document, it is possible to generate oxygen nanobubbles in the fluid. The knowledge that is possible. At the same time, it has been found that ozone bubbles can be almost completely removed from the fluid. As a result of these studies, the present invention provides a raw water treatment apparatus from which treated water from which ozone is removed and oxygen is contained as nanobubbles can be obtained.

A raw water treatment apparatus according to the present invention includes a magnetic aggregation unit that aggregates organic substances contained in a fluid by a magnetic action, an ozone treatment unit that generates cavitation after injecting ozone gas into a fluid containing the aggregates of the organic substances, space at the top of the tank body, it was a collection of over activated carbon filter in the lower part, the ozone bubbles remaining in the fluid after the cavitation has disappeared, was removed by the gas-liquid separator through the space portion, further in that a fluid A gas-liquid separation unit that adsorbs and decomposes dissolved ozone by the activated carbon filter and a filtration unit that removes the aggregates of organic matter are arranged in series, and raw water is supplied to the magnetic aggregation unit. The treated water from which ozone is removed and oxygen is contained as nanobubbles is supplied from the filtration unit. And wherein the Rukoto.

  The raw water treatment apparatus according to the present invention separates and removes ozone bubbles from a fluid by a gas-liquid separation unit. Also, bubbles contained in the fluid are crushed into nanobubbles when cavitation disappears. As a result, treated water in which ozone is removed and oxygen is contained as nanobubbles is obtained.

It is a block diagram which shows the basic composition of the raw | natural water processing apparatus made into an example of embodiment. It is a longitudinal cross-sectional view which shows the basic composition of a magnetic aggregation unit. (A) is the longitudinal cross-sectional view which shows the basic composition of an example of an ozone treatment unit, (b), (c) all are the cross-sectional views. It is a simple sectional view of a channel explaining a cavitation phenomenon. (A) is the longitudinal cross-sectional view which shows the basic composition of the modification of an ozone treatment unit, (b), (c) is all the cross-sectional views. The longitudinal cross-sectional view which shows the basic composition of the other modification of an ozone treatment unit, (b) is the cross-sectional view. It is a longitudinal cross-sectional view which shows the basic composition of a gas-liquid separation unit. It is a longitudinal cross-sectional view which shows the basic composition of a filtration unit. It is a longitudinal cross-sectional view of the processing unit formed by integrating the magnetic aggregation unit and the ozone processing unit. It is a block diagram which shows the basic composition of the raw | natural water processing apparatus made into the other example of embodiment.

FIG. 1 is a block diagram showing a basic configuration of a raw water treatment apparatus as an example of an embodiment.
The raw water treatment apparatus 1 includes a magnetic aggregation unit 11 that aggregates organic substances contained in a fluid by a magnetic action, an ozone treatment unit 12 that generates cavitation after injecting ozone gas into a fluid containing aggregates of organic substances, It has a pipe line 15 in which a gas-liquid separation unit 13 that discharges ozone bubbles remaining after cavitation disappears and a filtration unit 14 that removes organic aggregates are arranged in series.

A pump device 16 for feeding raw water is provided on the upstream side of the pipe line 15. The pump device 16 is not particularly limited in its type, and a general device such as a spiral pump or a piston pump can be used. Since the pump device 16 can be a source of fluid contamination, the pump device 16 may be configured so that water can be supplied to the filtration unit 14 only by the pump device 16.
When the raw water treatment apparatus 1 is configured in this way and raw water is supplied to the magnetic coagulation unit 11 by the pump device 16, treated water from which ozone is removed and oxygen is contained as nanobubbles is obtained from the filtration unit 14.

  The ozone supply device 17 is an element that supplies ozone gas to the ozone processing unit 12. The ozone supply device 17 may be configured by a gas tank pre-filled with ozone gas, or may be an ozone generation device, that is, a device that converts part of oxygen gas or air into ozone by ultraviolet rays or discharge. The ozone gas mentioned here is not 100% in concentration, but contains at least oxygen in addition to ozone, such as a mixed gas of ozone and oxygen, air containing ozone, or the like.

  The ozone decomposition device 18 is an element that decomposes ozone gas discharged from the gas-liquid separation unit 13, the filtration unit 14, and the like and then releases it into the air. The configuration of the ozonolysis apparatus 18 is not particularly limited. For example, ozone may be thermally decomposed by heating, or ozone may be self-decomposed by a catalyst such as manganese dioxide. In addition, the deformation | transformation which returns a part of ozone gas from the ozonolysis apparatus 18 to the ozone supply apparatus 17 is also considered.

  The piping 19 connecting the units is preferably made of resin pipes made of hard vinyl chloride or polyethylene, steel pipes lined with such a resin, or the like to suppress fluid contamination.

Hereinafter, the configuration and operation principle of each of the units will be described with reference to the drawings.
FIG. 2 is a longitudinal sectional view showing a basic configuration of the magnetic aggregation unit.
The magnetic aggregation unit 11 includes a main body 11b in which a flow path 11a through which a fluid is passed is formed, and a plurality of permanent magnets 11c arranged in the flow path 11a.
Since the main body 11b is basically in the shape of a tube, it may be formed using, for example, a resin tube made of hard vinyl chloride or a non-magnetic stainless steel tube.
The permanent magnets 11c are connected on the center line of the flow path 11a so that magnetic poles of the same polarity face each other. By making the magnetic poles of the same polarity face each other, a magnetic field spreading in the radial direction from the gap between the magnets can be obtained. In order to connect the permanent magnets 11c in this way, for example, a through hole is provided in each center line of the permanent magnets 11c, and the entire permanent magnets 11c are penetrated by bolts and bolted. Both ends of the permanent magnet 11c are fixed to the main body 11b by a support member 11d.

The magnetic aggregation unit 11 aggregates organic substances by magnetic action. Although the principle of organic substance aggregation by magnetic action is not completely elucidated, it is considered that when the fluid passes through the magnetic field, the interfacial potential of the colloid (suspended material) decreases and condenses. In the experiments by the inventors, the effect of organic substance aggregation is reliably obtained.
In the magnetic aggregation unit 11, the fluid flows in a direction orthogonal to a two-dimensional magnetic field extending in the radial direction from the center line portion of the flow path 11 a, so that the action received from the magnetic field is increased and organic substances can be efficiently aggregated. . If the organic matter is aggregated to increase the bulk in this way, it becomes easy to collect the organic matter by the filtration unit 14 described later.

  FIG. 3A is a longitudinal sectional view showing a basic configuration of an example of an ozone treatment unit, and FIGS. 3B and 3C are transverse sectional views showing different sections of the ozone treatment unit. In FIG. 3A, cross sections I and II corresponding to FIGS. 3B and 3C are indicated by alternate long and short dash lines. The double-ended arrow of the alternate long and short dash line is the line-of-sight direction.

  The ozone treatment unit 12 includes a main body 12b in which a flow path 12a through which a fluid is passed is formed, a fixed propeller 12c provided on the upstream side of the flow path 12a to turn the fluid into a swirl flow, and ozone gas near the center of the swirl flow. A gas discharge port 12d that discharges and a fluid acceleration structure 12e that is provided on the downstream side of the flow path 12a and accelerates the fluid by locally or partially regulating the flow path 12a to generate cavitation.

Since the main body 12b is basically in the shape of a tube, it may be formed using, for example, a resin tube made of hard vinyl chloride, a normal steel tube lined with such a resin, or a stainless steel tube.
If the fixed propeller 12c can accelerate the fluid through the flow path 12a as a swirling flow, the configuration, that is, the number and shape of the blades are not limited. In this example, the fixed propeller 12c has four blades. Stainless steel or the like is suitable as a material for the fixed propeller 12c.
The gas pipe 12f is a pipe for introducing ozone gas into the flow path 12a, and the gas discharge port 12d is provided on the downstream side on the center line of the fixed propeller 12c. The fixed propeller 12c may be fixed to the wall surface of the flow path 12a, or may be fixed to the gas pipe 12f.
If the fluid acceleration structure 12e can accelerate a fluid by restrict | limiting the flow path 12a locally or partially, the structure and shape will not ask | require. The fluid acceleration structure 12e in this example is a plurality of cylindrical bodies 12g that are erected from the wall surface of the flow path 12a toward the center line. The plurality of cylindrical bodies 12g are arranged such that four sets arranged radially at intervals of 90 degrees on the same cross section of the flow path 12a are set as a set, and the sets are arranged in series while being shifted by 45 degrees. ing.

The operation principle of the ozone treatment unit 12 is as follows.
The traveling direction of the fluid that has flowed into the flow path 12a of the ozone treatment unit 12 is changed by the fixed propeller 12c, and becomes a swirling flow downstream of the fixed propeller 12c. The fluid in the vicinity of the center line of the swirling flow is subjected to centrifugal force and the pressure becomes low. For this reason, if the gas discharge port 12d is provided in the region, the ozone gas can be spontaneously released into the fluid without pressurizing the ozone gas. Since the ozone gas injected into the fluid contains ozone and oxygen, the ozone bubble formed therefrom also contains ozone and oxygen as components.

  Since the swirl flow is not a uniform flow, the ozone bubbles are refined by being stretched or shredded in the flow. When the swirl flow reaches the fluid acceleration structure 12e on the downstream side, the swirl is rapidly weakened, so that the swirl flow is subjected to a strong shearing force and the ozone bubbles are refined into micro bubbles (several tens of microns in diameter). At this point, it is considered that ozone and oxygen dissolve in the fluid to a substantially saturated state. Ozone has a strong oxidizing power and has the effect of oxidatively decomposing organic substances and sterilizing microorganisms. In the region between the fixed propeller 12c and the fluid acceleration structure 12e, oxidation and decomposition of organic substances mainly composed of ozone are basically performed.

Thereafter, when the fluid passes through the fluid acceleration structure 12e, a cavitation phenomenon occurs.
FIG. 4 is a simple cross-sectional view for explaining the cavitation phenomenon caused by the fluid acceleration structure. Here, the fluid acceleration structure 12e is simplified to be a sphere. When the fluid passes in the vicinity of the fluid acceleration structure 12e, the traveling direction changes due to detour and the flow path 12a is also narrowed, so that the fluid is accelerated. When the water pressure becomes lower than the saturated vapor pressure due to this acceleration, local boiling occurs. Such local boiling is a cavitation phenomenon, and a large amount of minute vapor bubbles are generated. The vapor bubble expands or contracts depending on the water pressure, but when the water pressure becomes equal to or higher than the saturated water vapor pressure away from the fluid acceleration structure 12e, it is rapidly compressed and collapses. This compression is adiabatic compression, and a high energy field reaching about 100 MPs and 5000 K is locally formed. Therefore, water molecules are thermally decomposed to generate hydroxy radicals (OH) and the like. Hydroxy radicals are one of the most powerful oxidants and significantly promote the oxidation of organic matter, so that even non-degradable substances such as pesticides that do not normally react with ozone can be efficiently oxidized. . That is, in the region of the fluid acceleration structure 12e, the organic substance is oxidized and decomposed in cooperation with ozone and hydroxy radical. In addition, the shock wave emitted by the collapse of the vapor bubble pulverizes the ozone bubble to generate nanobubbles.

  The ozone treatment unit 12 has such a principle of action, and can effectively oxidize and decompose organic substances with dissolved ozone to sterilize microorganisms. Dissolved ozone is consumed by oxidation and self-decomposition of organic matter, but the consumed amount is replenished by dissolution from ozone bubbles. That is, since the ozone bubble functions as a supply source of dissolved ozone, the concentration of dissolved ozone is kept substantially constant. If ozone is dissolved from the ozone bubble in this way, the oxygen ratio in the bubble becomes high, so that the ozone bubble gradually changes to an oxygen bubble. As a result, the fluid that has passed through the ozone treatment unit 12 contains oxygen microbubbles and nanobubbles.

In order to make the ozone gas injected into the ozone treatment unit 12 into microbubbles by the swirling flow generated by the fixed propeller 12c, the shape of the fixed propeller 12c, the interval between the fixed propeller 12c and the fluid acceleration structure 12e, and the like are set. It is necessary to examine and optimize the flow velocity, water pressure, etc. at the fixed propeller 12c. In order to cause a cavitation phenomenon by the fluid acceleration structure 12e, it is necessary to examine the shape and arrangement of the fluid acceleration structure 12e and further optimize the flow velocity, water pressure, and the like in the fluid acceleration structure 12e.
In the ozone processing unit 12, minimizing ozone gas to microbubbles and causing a cavitation phenomenon are very important keys for obtaining oxygen nanobubbles.

  The ozone treatment unit 12 can be variously modified as described below. However, in order to obtain effects such as effective oxidative decomposition of organic matter and sterilization of microorganisms, an experiment of a good fixed propeller 12c is performed. It is important to obtain the shape, the distance between the fixed propeller 12c and the fluid acceleration structure 12e, the flow velocity, the water pressure, and the like.

Hereinafter, modified examples of the ozone treatment unit will be described.
FIG. 5A is a longitudinal sectional view showing a basic configuration of a modified example of the ozone treatment unit, and FIGS. 5B and 5C are transverse sectional views showing different sections of the ozone treatment unit. In FIG. 5A, cross sections III and IV corresponding to FIGS. 5B and 5C are indicated by alternate long and short dash lines. Elements common to the examples shown in FIGS. 3A to 3C are denoted by the same reference numerals and description thereof is omitted.
In this example, the fixed propeller 12c has two blades. The fluid accelerating structure 12e includes a plurality of cylindrical bodies 12g erected from the wall surface of the flow path toward the center line, and each of the cylindrical bodies is provided with a disk-shaped head 12h. The plurality of cylindrical bodies 12g are a set of four cylinders arranged radially every 90 degrees on the same cross section of the flow path, and a pair of tall cylindrical bodies 12g ... 12g... Are arranged so as to be arranged in series while being shifted by 45 degrees.

FIG. 6A is a longitudinal sectional view showing a basic configuration of another modified example of the ozone treatment unit, and FIG. 6B is a transverse sectional view of the ozone treatment unit. In FIG. 6A, a cross section V corresponding to FIG. Elements common to the examples shown in FIGS. 3A to 3C are denoted by the same reference numerals and description thereof is omitted.
In this example, the fluid acceleration structure 12e is composed of a plurality of partition walls 12i in which orifices 12h are formed. The plurality of partition walls 12i are arranged at predetermined intervals so as to block the flow path. The orifice 12h has a tapered conical surface.

FIG. 7 is a longitudinal sectional view showing the basic configuration of the gas-liquid separation unit.
The gas-liquid separation unit 13 has a tank-type main body 13a. The main body 13a may be formed of stainless steel or the like. Alternatively, it may be formed of ordinary steel and lined with resin or the like.
A water supply port 13b is provided at the upper side of the main body 13a, a gas discharge port 13c at the upper end, and a water outlet 13d at the lower end.
The water supply port 13b communicates with the dispersion nozzle 13e. The dispersion nozzle 13e discharges the fed water in a shower shape obliquely downward.
A receiving plate 13f that receives water droplets discharged from the dispersion nozzle 13e is fixed below the dispersion nozzle 13e. The receiving plate 13f is a tray-shaped plate body that is slightly smaller in diameter than the main body 13a and includes a flat bottom surface and a peripheral wall having a height of about several centimeters. The receiving plate 13f may be formed of, for example, stainless steel. A plurality of small holes may be provided on the bottom surface of the receiving plate 13f.
Further, an activated carbon filter 13g is provided below the receiving plate 13f. The activated carbon filter 13g is arranged so that there is a predetermined interval between the activated carbon filter 13g and the peripheral wall of the main body 13a. The activated carbon filter 13g may be formed in advance, or may be configured by disposing a support material 13h such as a wire mesh under the main body 13a and depositing granular activated carbon 13i thereon.
The gas discharge port 13c is provided with a float valve 13j. The float valve 13j is closed and opened in accordance with the vertical movement of the float portion 13k extending downward.
A pressure regulating valve 13m is provided at the water outlet 13d. The pressure regulating valve 13m is a type that opens and closes according to the water pressure at the valve position.

The principle of operation of the gas-liquid separation unit 13 is as follows.
As a pre-adjustment, a reference water level for opening and closing the float valve 13j and the pressure regulating valve 13m is determined between the receiving plate 13f and the activated carbon filter 13g. If the water level of the float valve 13j exceeds the reference water level, The height of the float part 13k is adjusted so that the valve is closed and the valve is opened if it is below the reference water level. On the other hand, when the space of the main body 13a is atmospheric pressure, the pressure regulating valve 13m is opened when the water level exceeds the reference water level, and is adjusted so as to be closed when the water level is lower than the reference water level. . As described above, if the operating points of the float valve 13j and the pressure regulating valve 13m are adjusted in advance, the water level of the main body 13a can be kept substantially at the reference water level. The water level used as the operating point of the pressure regulating valve 13m may be somewhat higher than the reference water level.
The gas-liquid separation unit 13 makes the fluid sent into a shower-like shape by the dispersion nozzle 13e, collides with the receiving plate 13f, and bounces back by the receiving plate 13f, thereby filling the space of the main body 13a with water droplets. So that ozone bubbles can be released. Since the surface area per volume increases as the water droplets become smaller, ozone bubbles can be easily escaped. Further, although the receiving plate 13f is in a state where the fluid is accumulated at a low water level, the surface area per volume of the fluid is increased, so that more ozone bubbles escape from the surface area.
The fluid overflowing from the peripheral wall of the receiving plate 13f falls downward and stirs the water surface accumulated under the fluid. This also encourages escape of ozone bubbles near the surface of the water. As a result, most of the ozone bubbles are removed from the fluid. The ozone gas thus removed is discharged from the gas discharge port 13c when the float valve 13j is opened.
The activated carbon filter 13g has an action of adsorbing, accumulating and decomposing dissolved ozone and ozone bubbles. Specifically, activated carbon adsorbs and accumulates ozone, and thus ozone having a high concentration reacts with activated carbon to generate CO2. High-concentration ozone reacts with organic matter and oxidizes and decomposes the organic matter. Since the reaction with activated carbon becomes inactive at low temperatures, the gas-liquid separation unit 13 may be kept warm and heated with a heater or the like.
In this way, dissolved ozone and ozone bubbles are almost completely removed from the fluid. On the other hand, dissolved oxygen and oxygen nanobubbles are less likely to be adsorbed by the activated carbon filter 13g than dissolved ozone and ozone bubbles. Therefore, the fluid after passing through the activated carbon filter 13g contains a large amount of dissolved oxygen and oxygen nanobubbles.

  The gas-liquid separation unit 13 has such a principle of operation, and the fluid is safe from living organisms and the environment because ozone bubbles and dissolved ozone are almost completely removed. Since ozone bubbles and dissolved ozone naturally evaporate from the water surface, the fluid stays in the gas-liquid separation unit 13 for a certain period of time (5 to 10 minutes) in consideration of the amount of water per hour sent from the water inlet. By doing so, the action of removing ozone from the fluid can be enhanced.

FIG. 8 is a longitudinal sectional view showing the basic configuration of the filtration unit.
The filtration unit 14 has a tank-type main body 14a. The main body 14a may be formed of stainless steel or the like. Or you may form with general steel materials and line it with resin etc.
The main body 14a is provided with a water supply port 14b at the lower end, a gas discharge port 14c at the upper end, and a water outlet 14d at the upper side.
The gas discharge port 14c is provided with a float valve 14e. The float valve 14e is closed and opened in accordance with the vertical movement of the float portion 14f extending downward.
The water outlet 14d is configured to control water discharge by overflow. However, the water outlet 14d is bent downward inside the main body 14a so that the space of the main body 14a does not communicate with the outside through the water outlet 14d during the overflow. Further, the water outlet 14d is provided with a vent 14g for preventing siphon phenomenon. The intake port 14g may be provided with a check valve for preventing the ejection of fluid (not shown).
The filtration filter 14h has a support material 14i such as a wire mesh disposed at the lower part of the main body 14a, and the particle size becomes smaller as a plurality of types of coarse sand or fine sands 14j, k, and m having different particle sizes are placed thereon. Thus, it is configured by depositing in layers. Garnet sand may be used as the sand type having the smallest particle size.
The operation principle of the filtration unit 14 is as follows.
As a pre-adjustment, the float valve 14e adjusts the height of the float portion 14f so that the reference water level for opening and closing is higher than the overflow water level at the outlet 14d. As a result, the funnel valve 14e basically remains open.
The fluid sent to the filtration unit 14 includes coarse organic substances that are aggregated by the magnetic aggregation unit 11. Such organic matter is easily collected by the filtration filter 14h in the middle of ascending the main body 14a. Part of the organic matter collected in this way is oxidatively decomposed by dissolved ozone or ozone bubbles that remain slightly in the fluid. This further reduces dissolved ozone and ozone bubbles remaining in the fluid. On the other hand, dissolved oxygen and oxygen nanobubbles are not so adsorbed by the filter 14h.
Since the filtration unit 14 is based on such a principle of operation, the organic substance contained in the fluid can be efficiently collected and oxidatively decomposed.
In the filtration unit 14 as well, if the volume of the main body 14a is determined so that the fluid stays in the filtration unit 14 for a certain time (5 to 10 minutes) in consideration of the amount of water sent, The action of removing ozone remaining in the water can be strengthened.

  The basic configuration and operation principle of the present embodiment are as described above. If raw water is supplied to the magnetic aggregation unit 11, organic substances are removed from the filtration unit 14 and oxygen is converted into nanobubbles without adding any chemicals. Contained treated water is obtained. This treated water is very hygienic and can be suitably used, for example, for washing foods and rearing fish.

FIG. 9 is a longitudinal sectional view of an integrated processing unit formed by integrating a magnetic aggregation unit and an ozone processing unit 12. Elements common to the magnetic aggregation unit 11 shown in FIG. 2 and the ozone treatment unit 12 shown in FIGS. 3A to 3C are denoted by the same reference numerals, and description thereof is omitted.
As described above, since the main bodies 11b and 12b of the magnetic aggregation unit 11 and the ozone processing unit 12 are tube-shaped, it is relatively easy to form them as the integrated processing unit 20. On the other hand, the gas-liquid separation unit 13 and the filtration unit 14 are difficult to form integrally with other units because the main bodies 13a and 13b are tank type.
The integrated processing unit 20 is not particularly added with a function, but piping for connecting the units becomes unnecessary and pressure loss is suppressed. Moreover, piping cost is also suppressed and the assembly work of the raw water treatment apparatus 1 is facilitated. In the case where the magnetic aggregation unit 11 and the ozone treatment unit 12 are integrally formed, the flow path 20a formed in the main body 20b may not be shared as a whole but may be different for each part. For example, since the flow path 11a of the magnetic aggregation unit 11 is narrowed by the amount of the permanent magnets 11c..., In the integrated processing unit 20, the flow path 20a corresponding to the magnetic aggregation unit 11 may be widened.

FIG. 10 is a block diagram illustrating a basic configuration of a raw water treatment apparatus as another example of the embodiment. Elements common to the example shown in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
This embodiment assumes that seawater is processed, and is characterized by using a plurality of integrated processing units 15 shown in FIG.

The raw water treatment apparatus 1 includes a first integrated treatment unit 20 (1), a first filtration unit 14 (1), a second integrated treatment unit 20 (2), a gas-liquid separation unit 13, The second filtration unit 14 (2) has a primary pipeline 15 arranged in series. That is, the first combined processing unit 20 (1) and the second combined processing unit 20 (2) have the primary pipeline 15 arranged in series via the first filtration unit 14 (1). A pump device 16 for feeding raw water is provided on the upstream side of the primary pipeline 15. As the pump device 16, a pump device capable of independently feeding water to the second filtration unit 14 (2) is used.
If the primary pipe line 15 has such a configuration, a series of treatments including magnetic aggregation, ozone treatment, and filtration are performed twice, so that organic substances contained in the raw water are more completely removed, The quality of treated water can be increased to a level that can be used for food and medical purposes.

The raw water treatment apparatus 1 includes a treated water tank 21 for storing treated water treated in the primary pipe 15, a high-pressure pump device 22, and a reverse osmosis membrane unit 23 that separates treated water into fresh water and concentrated salt water. A secondary conduit 24 is further provided.
The treated water tank is not particularly limited as long as the treated water tank can store the treated water discharged from the primary pipeline 15. As the material, resin, resin-lined plain steel, stainless steel, or the like may be used.
The type of the high-pressure pump device 22 is not particularly limited as long as it can generate a water pressure of about 5 to 10 MPs required for the reverse osmosis of the treated water in the reverse osmosis membrane unit 23. For example, a turbine pump, a plunger pump, etc. can be considered.
The reverse osmosis membrane unit 23 is of a known cross flow method. In this method, the treated water continues to flow along the surface of the reverse osmosis membrane in a certain direction, and concentrated salt water is continuously discharged after filtering the fresh water from the treated water, thereby suppressing adhesion of fine particles and impurities to the membrane. To extend the life of the membrane. In the treated water sent to the reverse osmosis membrane unit 23, the organic matter has already been almost completely removed by the treatment of the primary pipeline 15, so that the life of the membrane is further increased.

  In the present embodiment, the water purification treatment including magnetic aggregation, ozone treatment, and filtration is performed twice in the primary pipeline 15, and the organic matter contained in the raw water is further removed than in the previous embodiment. The point that ozone bubbles are completely removed from the treated water is the same as in the above embodiment. Moreover, it is thought that the oxygen nanobubble contained in the treated water is larger than that in the above embodiment.

The treated water is separated into fresh water and concentrated salt water in the secondary pipe 24, but the organic matter, microorganisms, etc. are completely removed from the fresh water filtered by the reverse osmosis membrane, and almost no mineral component remains. However, dissolved oxygen and oxygen nanobubbles are partially blocked without being blocked by the reverse osmosis membrane. The fresh water produced in this way is suitable for beverages, is also suitable for food and medical purposes, and can be expected to have a unique effect due to oxygen nanobubbles.
On the other hand, since the separated concentrated salt water does not contain any purification chemicals, it can be used for food, and even when dumped in the ocean, it does not adversely affect the environment.

DESCRIPTION OF SYMBOLS 1 Raw water treatment apparatus 11 Magnetic aggregation unit 12 Ozone treatment unit 12a Flow path 12b Main body 12c Fixed propeller 12d Gas discharge port 12e Fluid acceleration structure 13 Gas-liquid separation unit 13g Activated carbon filter 14 Filtration unit 15 Pipe line 20 Integrated treatment unit 23 Reverse osmosis Membrane unit

Claims (6)

A magnetic aggregation unit for aggregating organic substances contained in the fluid by a magnetic action;
An ozone treatment unit that generates cavitation after injecting ozone gas into the fluid containing the organic aggregates;
Space at the top of the tank body, it was a collection of over activated carbon filter in the lower part, the ozone bubbles remaining in the fluid after the cavitation has disappeared, was removed by the gas-liquid separator through the space portion, further in that a fluid A gas-liquid separation unit that adsorbs and decomposes dissolved ozone by the activated carbon filter ;
A filtration unit for removing the organic aggregates and a pipe line arranged in series,
A raw water treatment apparatus characterized in that raw water is supplied to the magnetic coagulation unit to obtain treated water from which ozone is removed and oxygen is contained as nanobubbles from the filtration unit. The raw water treatment apparatus according to claim 1, wherein the magnetic coagulation unit and the ozone treatment unit are integrally formed in an integral treatment unit. The raw water treatment apparatus according to claim 3, wherein the two or more integrated treatment units are arranged in series. The ozone treatment unit is
A main body formed with a flow path through which the fluid passes;
A fixed propeller provided on the upstream side of the flow path to make the fluid swirl;
A gas outlet for releasing ozone gas in the vicinity of the center of the swirling flow;
4. The fluid acceleration structure according to claim 1, wherein the fluid acceleration structure is provided on a downstream side of the flow path and accelerates the fluid by locally or partially regulating the flow path to generate cavitation. 5. The raw water treatment apparatus as described in any one of Claims. The raw water treatment apparatus according to any one of claims 1 to 4, wherein the gas-liquid separation unit includes an activated carbon filter that adsorbs and decomposes ozone. 6. The raw water is seawater, and a reverse osmosis membrane unit that separates the treated water into fresh water and concentrated salt water is disposed at a terminal end of the pipe. The raw water treatment apparatus according to item.

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