KR20100134553A - Method of purifying water containing metallic ingredient and apparatus for purification - Google Patents

Method of purifying water containing metallic ingredient and apparatus for purification Download PDF

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KR20100134553A
KR20100134553A KR1020107016452A KR20107016452A KR20100134553A KR 20100134553 A KR20100134553 A KR 20100134553A KR 1020107016452 A KR1020107016452 A KR 1020107016452A KR 20107016452 A KR20107016452 A KR 20107016452A KR 20100134553 A KR20100134553 A KR 20100134553A
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water
metal component
reverse osmosis
osmosis membrane
alkaline
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KR1020107016452A
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Korean (ko)
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스스무 하세가와
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가부시키가이샤 신꼬오 간쿄우 솔루션
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Publication of KR20100134553A publication Critical patent/KR20100134553A/en

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/58—Multistep processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/4618—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/025—Reverse osmosis; Hyperfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/4618—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water
    • C02F2001/4619—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water only cathodic or alkaline water, e.g. for reducing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds

Abstract

An object of the present invention is to provide a method for purifying a metal component-containing water capable of reducing the processing burden of concentrated water produced by reverse osmosis membrane separation.
The present invention is a method for purifying a metal component-containing water, which performs a reverse osmosis membrane separation step of separating the metal component-containing water in which the metal component is dissolved into purified water and concentrated water, which is permeate water, by reverse osmosis membrane separation. And an electrolytic step of electrolyzing the concentrated water to obtain alkaline water at the cathode side, and a precipitate separation step of filtering and separating the metal component precipitated by being alkaline from the alkaline water obtained in the electrolytic step. Provided is a method for purifying a component-containing water.

Figure P1020107016452

Description

Purification processing method and purification processing apparatus of metal-containing water {METHOD OF PURIFYING WATER CONTAINING METALLIC INGREDIENT AND APPARATUS FOR PURIFICATION}

The present invention purifies a metal component-containing water which obtains purified water by reverse osmosis membrane separation of metal component-containing water, such as sewage, factory drainage, groundwater, river water, landfill leachate, and seawater in which a metal component is dissolved. A method and a purification treatment apparatus.

Conventionally, as this kind of purification treatment method, a depositing step of depositing a metal component-containing water in which a metal component is dissolved with a depositing device such as a MF membrane filtration device, and a depositing process deposited by the depositing step A method of performing a reverse osmosis membrane separation step of separating water into permeate and concentrated water by reverse osmosis membrane separation is known.

In such a method, the permeated water by separation of the reverse osmosis membrane becomes purified water, and since the concentrated water contains many metal components, it cannot be disposed of as it is, but by solidifying and embedding the metal components by separate evaporation concentration treatment, etc. Is being processed.

Japanese Unexamined Patent Publication No. 2003-103259

However, the conventional purification treatment method has a problem that a huge burden is required for the treatment of the concentrated water, such as a large amount of energy is required to evaporate water in the treatment of the concentrated water produced by the reverse osmosis membrane separation. have.

In view of the above conventional problems, the present invention has an object to provide a method for purifying a metal component-containing water and a purifying treatment apparatus capable of at least reducing the processing burden of the concentrated water produced by the reverse osmosis membrane separation. .

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention provides the metal component containing water which performs the reverse osmosis membrane separation process which isolate | separates the metal component containing water which the metal component melt | dissolves into the purified water and concentrated water which are permeate water by reverse osmosis membrane separation. As a purification treatment method, further, an electrolytic step of electrolyzing the concentrated water to obtain alkaline water at the cathode side, and a precipitate separation step of filtration-separating the metal component precipitated by being alkaline from the alkaline water obtained in the electrolytic step. Provided is a method for purifying a metal component-containing water, characterized by the above-mentioned.

In the method for purifying the metal component-containing water, alkaline water in which the metal component is concentrated on the cathode side can be obtained by electrolysis in the electrolytic step, and the metal component precipitated by becoming alkaline by the precipitate separation step. Can be separated by filtration. Therefore, the processing burden of evaporation concentration for depositing and solidifying a metal component can be significantly reduced. In addition, the metal component isolate | separated by filtration can be removed, for example by backwashing. At this time, the generated backwash waste liquid may contain a metal component at a much higher concentration than the concentrated water separated by the reverse osmosis membrane. Therefore, even when backwashing, the processing burden of evaporation concentration can be remarkably reduced.

In the present invention, a depositing step of depositing the metal component-containing water before the reverse osmosis membrane separation step in a depositing apparatus is performed, and in the reverse osmosis membrane separation step, the reverse osmosis of the metal component-containing water deposited in the depositing step is performed. It is preferable to isolate | separate a membrane and to separate the precipitated metal component in the said depositing apparatus in the said precipitate separation process.

In such a method, the burden on the reverse osmosis membrane can be reduced by depositing in advance in the depositing step. In addition, in the precipitate separation step, the use of a decontamination apparatus used in the decontamination step eliminates the need for providing a decontamination apparatus separately, and further reduces the burden of treating the concentrated water in terms of cost of the apparatus.

In the present invention, in the electrolytic step, acidic water is obtained from the anode side, and the acidic water after the reverse osmosis membrane is sterilized and washed with the acidic water, or the acidic water as it is obtained in the electrolytic step. It is preferable to perform the neutralization process which adds and neutralizes to alkaline water which the metal component isolate | separated by the said precipitate separation process.

Alkaline water from which the precipitated metal component is separated is usually neutralized and disposed of through the precipitate separation process. In this method, since acidic water obtained at the anode side in the electrolytic process is used as the neutralizing solution. In addition, it is not necessary to prepare or generate acidic water separately, so that the burden of treating the generated concentrated water can be further reduced.

Moreover, it is preferable that it is an apparatus which deposits by filtration using an MF membrane or an UF membrane as said depositing apparatus.

In such a method, since a metallurgical component using a MF membrane or an UF membrane can separate the precipitated metal components relatively easily, the burden of treating the concentrated water can be further reduced.

Moreover, in this invention, it is preferable to make pH of the said alkaline water into 9-14.

In such a method, by setting the pH of the alkaline water to 9 or more, the metal component can be sufficiently precipitated, and the precipitated metal component can be sufficiently separated by the smelting apparatus, so that the burden of treating the concentrated water can be further reduced. . Moreover, if it is pH14 or less, the possibility of damaging a degreasing apparatus (for example, MF membrane etc.) is also reduced.

Moreover, this invention is a purification | cleaning apparatus of the metal component containing water which has the reverse osmosis membrane separation apparatus which isolate | separates the metal component containing water which the metal component melt | dissolves into the purified water which is permeate water, and concentrated water by a reverse osmosis membrane, And an electrolytic device which electrolyzes the concentrated water to obtain alkaline water at the cathode side, and a precipitate separation device for filtering and separating the metal component precipitated by being alkaline from the alkaline water obtained by the electrolytic device. It is to provide an apparatus for purifying water containing water.

As mentioned above, according to this invention, the processing burden of the concentrated water produced | generated by the reverse osmosis membrane separation can be reduced at least.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic flowchart which shows the apparatus and method for purifying the metal-containing water of one embodiment.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings.

First, the purification processing apparatus of metal component containing water is demonstrated.

1 is a schematic flow chart in a purification treatment apparatus for metal component-containing water of the present embodiment.

The purification | cleaning apparatus of the metal component containing water of this embodiment is the raw water tank 10 which stores the raw water A which is the metal component containing water in which a metal component is melt | dissolved normally, and was supplied from the raw water tank 10. A station for separating the depositing device 20 for depositing raw water A and the treated water deposited by the depositing device 20 into purified water and concentrated water C, which are permeate water B, by a reverse osmosis membrane. From the permeation membrane separation apparatus 30, the electrolyzer 40 which electrolytically decomposes the said concentrated water C, and obtains alkaline water D from a cathode side, and the alkaline water D obtained by the electrolysis apparatus 40 from The precipitate separation apparatus 50 which isolate | separates the metal component which precipitated by becoming alkaline is provided.

The raw water tank 10 is configured as a tank for storing raw water A.

As raw water (A), sewage, biological treatment water of sewage, factory drainage, groundwater, river water, landfill leachate, seawater, etc. are mentioned, for example.

Moreover, calcium, magnesium, iron, aluminum etc. are mentioned as a metal component contained in these raw water (A).

The said depositing device 20 is made to communicate with the said raw water tank 10 by the piping in which the pump was interposed, and the raw water A stored in the raw water tank 10 is supplied, and the supplied The filtering member which filters raw water A is provided so that raw water A may be deposited.

As this filtration member, the filtration member provided with the membrane member 21, such as a microfiltration membrane (MF membrane) and an ultrafiltration membrane (UF membrane), and the sand filtration layer used for sand filtration.

Preferably, it comprises the membrane member 21, More preferably, it is equipped with the microfiltration membrane.

On the other hand, in the present specification, filtration means rougher filtration than reverse osmosis membrane filtration, that is, it is performed before separation of the reverse osmosis membrane, and means that coarse impurities are removed rather than separation with the reverse osmosis membrane.

In the purification treatment apparatus of the present embodiment, the treatment treatment water deposited in the deposition apparatus 20 by piping is supplied to the reverse osmosis membrane separation apparatus 30. Specifically, a reverse osmosis membrane is provided through a pipe in which a deposit treatment water tank 22 in which the deposit treatment water deposited in the depositing device 20 is stored, and the deposit treatment water in the deposit treatment water tank 22 is fitted between the pumps. It is supplied to the separation apparatus 30.

In addition, if necessary, the treated water and the like are flowed back into the depositing device 20 so that the depositing device 20 can be washed (so-called backwashing).

The reverse osmosis membrane separation device 30 is provided with a reverse osmosis membrane 31 (RO membrane 31), and the supplied effluent treated water is separated from the reverse osmosis membrane, and the permeated water having almost no dissolved metal components ( B) phosphorus purified water and dissolved metal components are separated into concentrated concentrated water (C).

The permeate water (B) is usually set to an electrical conductivity of 200 µS / cm or less, preferably 50 µS / cm or less. The concentrated water (C) has an electrical conductivity of 3000 to 15000 µS / cm, preferably 5000 to 10000 µS / cm.

In the purification apparatus of the present embodiment, the permeated water B is discharged to the outside of the system by piping, and the concentrated water C is supplied to the electrolytic device 40.

Specifically, the electrolytic apparatus is provided with the concentrated water storage tank 33 in which the concentrated water C is stored, and the concentrated water C stored in the concentrated water storage tank 33 is provided with a pump interposed therebetween. It is supposed to be supplied to 40.

The electrolytic device 40 includes an electrolytic cell 41 having a cathode and an anode for storing the supplied concentrated water C, and the electrolytic cell 41 is divided into a cathode side and an anode side by the diaphragm 42. It is composed. As said diaphragm 42, microporous membranes, such as an MF membrane, or an ion exchange membrane are mentioned, for example.

The electrolytic device 40 is configured to electrolyze the concentrated water C by applying a voltage to the cathode and the anode.

In the electrolytic apparatus 40, when electrolysis is carried out, the metal component is concentrated on the cathode side and hydroxyl ions are generated, so that alkaline water (D) can be obtained on the cathode side, and on the positive side, the acidity is reversed. The number (E) can be obtained.

The said alkaline water (D) is adjusted so that pH may be 9-14 normally, Preferably pH is 10-12.

In the purification processing apparatus of the present embodiment, the alkaline water D is further supplied to the precipitate separation apparatus 50 by piping.

In detail, the alkaline water storage tank 44 in which the alkaline water D is stored is provided, and the alkaline water D stored in the alkaline water storage tank 44 separates precipitates through a pipe in which a pump is fitted. It is supposed to be conveyed to the said depositing apparatus 20 as the apparatus 50.

In addition, when the alkaline water D stored in the alkaline water storage tank 44 does not reach a predetermined pH value, at least a part of the alkaline water D is circulated back to the cathode side of the electrolytic cell 41, It is comprised so that pH of alkaline water (D) in the tank of the alkaline water storage tank 44 may be adjusted.

The depositing device 20 as the precipitate separating device 50 is configured such that the precipitated metal component is filtered and separated by the filtration member 21 from the supplied alkaline water D.

In the purification processing apparatus of this embodiment, the alkaline water D from which the precipitated metal component is separated is supplied to the neutralization tank 60 for neutralizing the alkaline water D.

In addition, the above-mentioned depositing apparatus 20 is capable of backwashing by backflowing the treated water and the like, and by backwashing, a solid component such as a metal component or a suspended substance separated by filtration is contained in a high concentration in the backwashing waste liquid F. It is stored in the backwash waste liquid storage tank 23, and is discharged | emitted out of the system.

On the other hand, the backwash waste liquid (F) containing the metal component discharged | emitted out of the system at high concentration will be water-processed by the conventionally well-known method.

In this embodiment, as a metal component precipitated from alkaline water (D), calcium, magnesium, iron, aluminum etc. are mentioned, for example, These are calcium carbonate, magnesium carbonate, iron hydroxide, hydroxide hydroxide, for example. Precipitates in an inorganic salt state such as aluminum.

In the purification processing apparatus of the present embodiment, the acidic water E is further supplied to the reverse osmosis membrane separation device 30 by a pipe, and is further supplied to the neutralization tank 60.

Specifically, a reverse osmosis membrane is provided through a pipe having an acidic water storage tank 46 in which the acidic water E is stored, and the acidic water E stored in the acidic water storage tank 46 with a pump interposed therebetween. The acidic water E which supplied to the separation apparatus 30 and wash | cleaned the reverse osmosis membrane 31 is comprised so that it may be supplied to the neutralization tank 60. FIG.

On the other hand, when the acidic water E stored in the acidic water storage tank 46 does not reach a predetermined pH value, at least a part of the acidic water E is circulated and returned to the anode side of the electrolytic cell 41, It is comprised so that pH of the acidic water (E) in the tank of the acidic water storage tank 46 may be adjusted.

In the purification processing apparatus of the present embodiment, the acidic water E supplied to the reverse osmosis membrane separation device 30 and cleaned of the reverse osmosis membrane 31 is circulated to the acidic water storage tank 46 by piping. It can also be. Specifically, the circulated conveyed acidic water E is supplied to the reverse osmosis membrane separation device 30 again to wash the reverse osmosis membrane 31, and then to the neutralization tank 60. have.

In the neutralization tank 60, alkaline water D and the acidic water E which have passed through the precipitate separation device 50 are mixed and neutralized.

In addition, the neutralized water G neutralized in the neutralization tank 60 is supplied to the said raw water tank 10 via the piping in which the pump was interposed, or discharged out of the system via the backwash waste liquid storage tank 23. It is or is to be done.

On the other hand, the neutralized water G discharged out of the system is subjected to water treatment by a conventionally known method.

In this embodiment, since the acidic water E is supplied to the reverse osmosis membrane separation apparatus 30, the scale and bacteria adhered to the reverse osmosis membrane 31 are removed.

Here, the said acidic water (E) is adjusted so that pH may be 1-5 normally, Preferably pH is 2-4.

If it is such pH, sufficient scale removal and sterilization can be performed, without causing a big damage to the reverse osmosis membrane 31. FIG.

The purification processing apparatus of the metal component containing water of this embodiment is as above-mentioned, Next, the purification processing method of the metal component containing water of this embodiment is demonstrated.

In the purification treatment method of the present embodiment, a reverse osmosis membrane is used for depositing a raw water (A), which is a metal component-containing water in which a metal component is dissolved, in a depositing device (20), and a deposit treated water deposited in the depositing step. Reverse osmosis membrane separation step of separating permeate water (B) into purified water and concentrated water (C) by separation, and electrolytically decomposing the concentrated water (C) to obtain alkaline water (D) on the cathode side. Purification of the electrolytic step of obtaining acidic water (E) from the precipitate, the precipitate separation step of filtering and separating the metal component precipitated by being alkaline from the alkaline water (D) obtained in the electrolytic step, and the metal component separated by filtration by back washing. Neutralization ball which removes from the apparatus 20 and discharges the backwash waste liquid containing the removed metal component, etc., and neutralizes by mixing alkaline water and the acidic water (E) which went through the said precipitate separation process. Conduct.

In this embodiment, since the precipitated metal separation process separates the precipitated metal component and performs the wastewater treatment for the backwashing waste liquid containing the metal component at a high concentration, the amount of water that is the object of the wastewater treatment ) Can be reduced, and the processing burden can be significantly reduced.

In the above-mentioned purification step, suspension components such as mud contained in the raw water (A) are removed by, for example, membrane filtration.

By such a process, the possibility that the reverse osmosis membrane 31 used in a reverse osmosis membrane separation process may be damaged by a suspension component can be reduced.

In the reverse osmosis membrane separation step, the raw water (A) from which the suspending component is removed by the depuration step is separated into permeate water (B) and concentrated water (C) in which the metal component is concentrated by reverse osmosis membrane separation.

In this embodiment, since the reverse osmosis membrane 31 is used, the purified water of very high purity in which the dissolved metal was removed can be obtained.

As the permeate water (B), the electrical conductivity is usually 200 µS / cm or less, preferably 50 µS / cm or less. In addition, as said concentrated water (C), electrical conductivity is made into 3000-15000 microS / cm normally, Preferably you may be 5000-10000 microS / cm.

In the said electrolytic process, the concentrated water (C) produced | generated by the reverse osmosis membrane process is isolate | separated into alkaline water (D) of a cathode side, and acidic water (E) of a positive electrode side by electrolysis.

The voltage applied at the time of electrolysis is 1-5V normally, Preferably it is 2-3V.

By setting it as such a voltage, concentrated water C can be fully electrolyzed.

In addition, the time of electrolysis is not specifically limited, It continues until the pH of alkaline water (D) is 9-14 and the pH of acidic water (E) becomes 1-5.

By making alkaline water (D) into such pH, the metal component contained can fully be precipitated.

Moreover, when acidic water (E) is made into such pH, when the reverse osmosis membrane 31 is wash | cleaned with the acidic water (E), descaling and sterilization can fully be carried out, and the reverse osmosis membrane 31 ) Damage can be reduced.

In the precipitate separation step, the metal component precipitated by being alkaline from the alkaline water (D) obtained in the electrolytic step is separated by filtration.

Specifically, metal components such as calcium, magnesium, iron and aluminum precipitated in an inorganic salt state such as calcium carbonate, magnesium carbonate, iron hydroxide and aluminum hydroxide are separated using the depositing device 20 used in the above-mentioned depositing step. do.

In the said neutralization process, alkaline water (D) and the acidic water (E) which passed through the said precipitate separation process are supplied to the neutralization tank 60, and both are mixed and neutralized. Specifically, the neutralization tank 60 carries out alkaline water (D) which passed through the said precipitate separation process, and acidic water (E) which is the washing | cleaning waste liquid which supplied the reverse osmosis membrane 31 and wash | cleaned the reverse osmosis membrane 31. Supply to neutralize.

In the present embodiment, the neutralized water (G) obtained in the neutralization step is mixed with the raw water (A) and subjected to the same treatment again with the raw water (A), or discharged to the outside of the system via the backwash waste liquid storage tank (23). Or

Although the purification processing apparatus and purification processing method of the metal component containing water in this embodiment are as above-mentioned, The purification processing apparatus and purification treatment method of the metal component containing water of this invention are not limited to the said embodiment, It is design change suitably. This is possible.

For example, in the purification treatment method of the present embodiment, in the neutralization step, a washing waste liquid obtained by acid-cleaning the reverse osmosis membrane 31 is used as the acid water (E). E) The washing | cleaning apparatus 20 is acid-cleaned, and this washing | cleaning waste liquid may be used as acidic water (E) in a neutralization process, and neutralization process is carried out as it is, without using acidic water (E) obtained by an electrolytic process for washing | cleaning. You can also use

Moreover, in the purification processing apparatus of the metal component containing water of this embodiment, the backwash waste liquid storage tank 23 which stores backwash waste liquid F and neutralization water G is provided, but in this invention, a backwash waste liquid storage tank 23 is provided. ) May not be provided, and the backwash waste liquid (F) or the neutralized water (G) may be directly discharged to the outside of the system. Similarly, in the purification treatment method, it may be discharged out of the system without passing through the backwash waste liquid storage tank 23.

Moreover, in the purification processing apparatus of the metal component containing water of this embodiment, although the decontamination treatment tank 22 which stores the decontamination water as backwashing etc. of the decontamination apparatus 20 is provided, in this invention, a decontamination treatment tank (22) is not provided and, for example, the concentrated water (C) stored in the concentrated water storage tank 33, the acidic water (E), the purified water (B) stored in the acidic water storage tank 46, and the like are reversed. It may be comprised so that it may be supplied to the depositing apparatus 20 as washing | cleaning. Similarly, in the purification treatment method, the purification apparatus 20 may be backwashed using concentrated water (C), acidic water (E) or purified water (B) without using the water treatment.

20... A depositing device
30. Reverse osmosis membrane separation device
40…. Electrolytic device
50…. Precipitate separation device

Claims (6)

A method of purifying a metal component-containing water, which performs a reverse osmosis membrane separation step of separating a metal component-containing water in which a metal component is dissolved into purified water and concentrated water, which are permeate water, by a reverse osmosis membrane separation.
Further, an electrolytic step of electrolyzing the concentrated water to obtain alkaline water at the cathode side, and a precipitate separation step of filtration-separating the metal component precipitated by being alkaline from the alkaline water obtained in the electrolytic step, characterized by the above-mentioned. Method for purifying metal-containing water. The method of claim 1,
A depositing step of depositing the metal component-containing water before the reverse osmosis membrane separation step in a depositing apparatus is carried out. In the reverse osmosis membrane separation step, the reverse osmosis membrane separation of the metal component-containing water deposited in the depositing step is performed. In the precipitate separation step, the metal component-containing water purifying treatment method of separating the precipitated metal component in the above-mentioned depositing device. The method according to claim 1 or 2,
In the electrolytic step, acidic water is obtained on the anode side, and the acidic water after the reverse osmosis membrane is sterilized and washed with the acidic water, or the acidic water as obtained in the electrolytic step is subjected to the metal component by the precipitate separation step. A method for purifying a metal component-containing water, which carries out a neutralization step of adding to the separated alkaline water and neutralizing it. The method of claim 2,
A method for purifying a metal component-containing water, wherein the depositing apparatus is an apparatus for depositing by filtration using an MF membrane or an UF membrane. The method according to any one of claims 1 to 4,
The purification method of the metal component containing water which makes pH of the said alkaline water into 9-14. An apparatus for purifying a metal component-containing water having a reverse osmosis membrane separation device for separating a metal component-containing water in which a metal component is dissolved into purified water and concentrated water, which are permeated water, by a reverse osmosis membrane,
A metal comprising: an electrolytic device that electrolyzes the concentrated water to obtain alkaline water at the cathode side, and a precipitate separation device that filters and separates the metal component precipitated by being alkaline from the alkaline water obtained by the electrolytic device. Purification processing apparatus of component containing water.
KR1020107016452A 2008-03-31 2009-03-04 Method of purifying water containing metallic ingredient and apparatus for purification KR20100134553A (en)

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JP2008318350A JP5564174B2 (en) 2008-03-31 2008-12-15 Purification method and apparatus for purification of water containing metal components

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