JP2962397B2 - Treatment agent for metal ions in wastewater - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to anthraquinone or anthraquinone.
Hydroquinone, a redox reagent consisting of derivatives of
Using a mold to selectively carry out the reduction reaction, contained in the wastewater
Divalent metal ions selectively in flowing aqueous solution
Change to monovalent metal ions, if necessary, solid porous
Elute monovalent metal ions separated and deposited on the carrier
And elute it out of the system to form monovalent metal ions.
Adversely affect aquatic creatures
Harmless by recovering metal ions in wastewater from aqueous solution
Elute and recycle monovalent metal ions,
It is about technology. [0002] In an aqueous solution, polyvalent metal ions are formed.
Using hydroquinone-quinone type redox reagent
About the method of reduction by anthraquinone
Hydroquinone type organic solvent solution of traquinone derivative
Using copper, silver and mercury to convert polyvalent metal ions in aqueous solution
There is a known method to separate and recover by reducing to metals such as
(U.S. Pat. No. 3,820,979). Use here
Redox reagents are completely oxidized once and then
Hydrogenation and reduction of the redox reaction reagent
It is recycled as a solvent solution. Presumed c
Representative redox reagents of the idroquinone-quinone type
Is as shown in [Formula 01]. Embedded image [0003] These redox reaction reagents
Is also used in a state of being dissolved in the solution.
Both had the disadvantage of being lost. Anthraquinone and its invitation
As a redox reaction reagent for a conductor, for example,
Quinone, 2-methylanthraquinone, 2-ethylant
Laquinone, 2-propylanthraquinone, 2-isopro
Pyranthraquinone, 2-t-butylanthraquinone,
2-amylanthraquinone, tetrahydroanthraquino
And 2-substituted-tetrahydroanthraquinone
And butadiene or diene compounds having a substituent.
Condensation Reaction between Products and Naphthoquinone (Diels Alde
r reaction) or phthalic anhydride and the corresponding benzene compound
Can be synthesized by the Friedel-Crafts reaction
You. In the aforementioned US Pat. No. 3,820,979,
Excluding these anthraquinones
Examples of conductors and organic solvent solutions used in combination are
Are listed. As a solvent used to dissolve
Must have a mixture of non-polar or polar solvents with a high boiling point.
There was a shortcoming that was needed. For example, as a non-polar organic solvent
Is alkyltoluene, alkylnaphthalene or dif
Phenyl, octanol and ethyl as polar organic solvents
Hexanol or diisobutyl ketone
Dialkyl phthalate, diallyl phthalate, alkyl
Use esters such as benzoate and benzyl acetate.
To use. [0005] The above-mentioned US Pat.
In the example of 820,979, this redox reaction reagent is
To be used as an organic solvent solution, it is flammable or
It is necessary to overcome the danger or disadvantage in use such as loss
Process, coexisting aqueous phase, organic solvent phase and metal
There are difficulties in the three-phase separation of the solid phase to be reduced and recovered, and
Amount of redox reagent lost with solid phase residue
Has a significant impact on the economics of the process.
there were. Also used for the treatment of copper ions in wastewater
Removal of copper ions is inadequate, some of which
Reduced to the point where excess redox reagent is consumed.
There was a point. Means for Solving the Problems A redox reaction reagent is combined with a metal ion treating agent.
To completely or completely reduce or trap metal ions in wastewater.
Repetitive economically advantageous and easy to handle
As a result of intensive studies, the redox reaction
The reagent was supported on a solid porous carrier and stored.
Divalent metal ions to be processed by connecting containers in series or parallel
The raw solution containing
Contact reaction with redox reagents carried on the body sequentially
And selectively reduce it to monovalent metal ions,
Complete separation and capture on a porous carrier and reaction if necessary
After that, the monovalent material separated and captured on the solid porous carrier
The solution that elutes metal ions is circulated and eluted out of the system,
Next, by flowing a reducing liquid through the container,
Degree of metal ion treatment as a metal ion treatment agent in the wastewater
The system is returned to the system, and divalent metal ions in
To the metal ions in the wastewater.
Metal ion treatment to recover ON as monovalent metal ions
Agent was successfully prepared and the metal ion treatment
Concrete to recover metal ions in wastewater
We found the implementation system and completed the invention. [0007] The first aspect of the present invention is a solid porous carrier.
Metals by redox reagents adsorbed and supported on
In order to achieve complete removal of ions and effective repeated use,
Adsorption and support of redox reagents on solid porous carriers
Successful in preparing the metal ion treatment agent
When. As a redox reaction reagent in the present invention,
Is the ability to reduce divalent metal ions to monovalent metal ions
It is a compound that has strong power and is
Any compound can be used as long as it is a fixed compound.
For example, a compound having a hydroquinone skeleton,
As a compound, a known quinone compound is reduced in a broad sense.
And other compounds. Other compounds that reduce indigo, etc.
Are also mentioned. As a compound having a hydroquinone skeleton
Is an anthrahydroquinone (9,10-dihydroxya
And its hydrogenated compounds and their substitution
Hydroquinone compounds selected from the body. the above
As a substituent in a substituted product of a hydroquinone compound
Is, for example, an alkyl group, an alkenyl group, an alkoxyl
Group, phenyl group, alkylamino group, halogen group, etc.
Relatively hydrophobic substituents may be mentioned. Alkyl group and Al
Alkyl and alkenyl chars of coxyl
The prime number is 1 to 60, practically 24 or less,
The groups may be linear or branched. [0010] In addition, as long as the object of the present invention is not hindered,
Sulfonic acid as a substituent of these hydroquinone compounds
Group containing a sulfonic group, a sulfonamide group or a carboxyl group
Although a substituent can be employed, the metal ion treatment of the present invention can be used.
Since the agent is used in an aqueous solution, it is generally
Reducing compounds having hydrophobic substituents that do not elute
Is preferred. The compounds having these substituents include:
2-methylanthrahydroquinone, 2-ethylanthra
Hydroquinone, 2-amylanthrahydroquinone, 2-
t-butylanthrahydroquinone, 2- (4-methyl-
Alkylated hydro such as pentyl) anthrahydroquinone
Quinone compound; 2- (4-methyl-pentenyl) ant
Alkenylated hydroquinone compounds such as lahydroquinone;
1-methoxyanthrahydroquinone, 1,5-dimethoxy
Alkoxylated hydroquino such as cyantrahydroquinone
Compound; phenyl substitution such as 2-phenylhydroquinone
Hydroquinone compound; 2-N, N-dimethylamino-a
Alkyl aminated hydroquinones such as intrahydroquinone
Compound; 1-chloroanthrahydroquinone, 2-chloro
Halogenated hydroquinone compounds such as anthrahydroquinone
Things. As a hydrogenated compound of a hydroquinone compound
Is 1,4-dihydro-9,10-dihydroxyant
Helix, 1,2,3,4-tetrahydroanthrahydro
Quinone, 1,2,3,4,5,6,7,8-octahydride
Loanthrahydroquinone and the like. These hydroquinone compounds are converted in air
Because they are easily oxidized, these hydroquinone compounds
The corresponding oxidant quinone compound is absorbed by the porous carrier.
After carrying, reduction treatment and hydroquinone type
A reconstitution method can be employed. A redox reaction reagent is provided on a solid porous carrier.
Is usually carried, for example, on isopropanol.
Dissolve a volume of redox reagent and add it to a solid porous
And then adsorb it, then slowly distill off the solvent
To keep the solution in a saturated state, and first correspond to the amount of adsorption
Dissolves and adsorbs the quinone form of the redox reaction reagent of the growing crystal
After allowing it to dry, or carry out solvent exchange to carry
Redox not supported on a solid porous carrier
Wash the reaction reagents with desalted water and keep them moist.
To carry a specified concentration of redox reagent
A metal ion treating agent in the waste water is prepared. A redox reaction reagent is provided on a solid porous carrier.
Is adsorbed from the saturated solution by an operation such as solvent evaporation.
The solvent used to carry by solvent exchange in
Compatible isopropanol, methanol, or ethanol
It is selected from solvents that are easy to handle such as knol. According to the above-described operation, the resin is placed on the solid porous carrier.
After supporting the dox reaction reagent, the supported redox
To reduce the reaction reagent to the hydroquinone form,
, For example, hydrosulfur represented by [Chemical Formula 02]
Sodium solution in an environment with a pH value of 10 or less.
Redox reaction reagent supported by liquid
Can be performed almost quantitatively without desorption. Embedded image As the solid porous carrier, a supported red
Projected cross-sectional area of the reaction reagent, for example, ethyl anthra
In the case of quinone, it is effective for about 8 Å or more.
It is desirable to have many pores that can be used. Generally, solid
As porous carriers, silicon dioxide, activated carbon, activated carbon
Fibers and other carbon products, hydrophobically prepared silicon dioxide particles
Particles, carbon particles, for example, polytetrafluoroethylene.
Processed product of aqueous emulsion (JP-A-53-9298)
1), organic synthetic polymer particles, for example, so-called
Styrene divinylbenzene copolymerization as an organic synthetic adsorbent
The body or its molded product is used. Ratio table per gram
The area is 80 ~ for particles such as silicon dioxide and synthetic polymer.
600 square meters, carbon particles per gram
A surface area of 1000 square meters is standard. Activated carbon is
Any of powder or pellet, spherical or crushed charcoal
Form can also be adopted. The second is the redox reaction used in the present invention.
The reagent has a unique equilibrium redox potential (here
And the equilibrium oxidation-reduction potential
Redox when the corresponding reductant is in equilibrium
Refers to the original potential. ), Higher divalent to monovalent metal
A divalent metal ion having an equilibrium redox potential of the ion,
For example, selectively with cupric ion or mercury ion, etc.
Perform a reduction reaction to convert divalent metal ions to monovalent metal ions,
For example, changing to cuprous ion or mercury ion, etc.
Monovalent metal ions from aqueous solution onto solid porous carrier
The discovery of quantitative separation and sequestration. In the present invention, as a monovalent metal ion
As the metal ions to be captured, the carrier in the present invention
(Metal ion treating agent) as monovalent metal ion
If it is captured, it is adopted, but in general, divalent copper
Ion and mercury ion. With the corresponding anion
To form a water-soluble salt as a divalent metal ion,
There is no particular limitation as long as it can be captured by the metal ion treatment agent.
As salts of, for example, cupric chloride, cupric bromide, sulfuric acid
Copper salts of inorganic acids such as copper; copper salts of organic acids such as cupric acetate; copper
Complex salts such as acetylacetonate, or mercuric chloride,
Mercury salts of inorganic acids such as mercuric bromide and mercuric sulfate; acetic acid
And mercury salts of organic acids such as mercury. [0020] Metal ions are treated using a metal ion treating agent.
The conditions for the treatment are generally such that the pH is at the equilibrium oxidation-reduction potential.
In relation, the metal ions of interest are treated with metal ions
Selected from conditions that can be captured by the agent, but generally
Is selected from the 0th to 8th positions. Metal ion concentration in aqueous solution
Is generally 0.01 to 10000 ppm, preferably
0.1 to 1000 ppm, and the treatment temperature is generally 1
It is carried out at 0 to 70 ° C., usually at normal temperature. Monovalent metal captured by metal ion treating agent
As for ions, this monovalent metal ion can be eluted.
Can be eluted and recovered by solution,
Incineration of the treating agent having captured the incinerator by a known incineration method,
It can also be recovered in the form of a metal, oxide or salt. Special
In addition, cuprous ion is, for example, cuprous chloride, cuprous bromide
But insoluble in hydrochloric acid or aqueous ammonia
Use these aqueous solutions as eluents because they are soluble
Can be easily collected. This solution
The liquid is selected from the concentration that can dissolve these cuprous ions
However, in general, concentrated hydrochloric acid or concentrated aqueous ammonia is used.
It can be appropriately diluted as needed. When eluting
The conditions are generally performed at room temperature. A container containing a metal ion treating agent is connected in series or
When configuring a system connected in parallel,
The distributed divalent metal ions are stored in the container
Redox reaction reagent supported on metal ion treatment agent
For example, in the case of a downward flow, the layers come into contact sequentially from the top of the layer, and
Is reduced to monovalent metal ions and quantitatively separated on the treating agent
And the sedimentation is captured.
Control and no further reduction occurs
Thus, metal ions can be treated very advantageously. Hereinafter, a system constituting the present invention will be described with reference to FIG.
A specific example will be described according to [1]. [Preparation of metal ion treating agent] Carrying amount of predetermined concentration to be prepared
Redox reaction reagent corresponding to
Prepare an isopropanol solvent and add a certain amount of solid
After mixing the porous carrier, the temperature is kept constant, and
After dissolving the crystals and performing the adsorption operation, while rolling under reduced pressure
The solvent is gradually distilled off from the
Adsorb the reagent on a solid porous carrier
In this case, after the solvent exchange operation, it is carried on a solid porous carrier.
And the unsupported redox reagent is desalted.
Rinse with cold water and keep wet. The prepared metal powder held in a wet state
When the on-treatment agent is used to treat metal ions in wastewater
When the required amount is
Of the metal ion treatment agent in the wastewater
Preparation is complete. [Metal Ion Filled in Metal Ion Treatment Vessel
Treatment of metal ion treatment agent]
Unit (1) is a reducing solution that constitutes the metal ion treatment system
By passing the prepared reducing agent aqueous solution into the tank (2)
And a reduction reaction treatment to hydroquinone type. In the container
After replacing the hold-up with treated water, the metal ions
Introduce raw water to be treated. [Standard metal ion treatment] Reduction reaction treatment in advance
Fill metal ion treatment vessel (1) with treated water
After that, the raw water inlet line of the metal ion treatment system (a)
To the metal ion processing vessel (1), and a predetermined flow rate
And start metal ion treatment. place
A metal ion detector is installed at the outlet line (b) for water treatment.
The set value at the outlet, for example, the predetermined metal ion concentration.
When it comes out, switch to the spare metal ion processing vessel (1)
Perform operations such as [Metal ion filled in a metal ion treatment container
Treatment metal deionization] Metal ions at the outlet of treated water
When the concentration exceeds the set value, the raw water inlet line (a) and
And an outlet line (b) for treated water
Switch to vessel (1). If a repeat operation is required,
Metal ion treatment in which reduction-trapped metal ions are separated and deposited
Demetallized ion treatment solution constituting the system in the container (1)
Pass the prepared demetalized ion solution into the tank (3),
Dissolves metal ions deposited and trapped on ion treatment agent
Then, the hold-up in the container is
Drain into the processing solution tank (3) and prepare in the replacement washing water tank (4)
Replace with washing water. This operation is performed by filling a metal ion treatment container.
[Reduction treatment of metal ion treatment agent], [Standard metal ion
[Processing]. Also, if necessary
[The metal ion treatment agent filled in the metal ion treatment container
Demetallization ion treatment]. The present invention will be described in more detail with reference to examples.
However, the present invention, unless it exceeds the gist, the following examples
However, the present invention is not limited to this. In this embodiment,
"%" Means "% by weight" unless otherwise specified. [Example 1] <Preparation of metal ion treating agent>
Glass containment vessel (column) (22 mm diameter
(300 mm height) as a solid porous carrier
, A particulate synthetic polymer adsorbent wet with methanol
(Product name "SP207" manufactured by Mitsubishi Kasei, particle size 0.4 ~
Fill 0.8ml spherical) 100ml
As a redox reaction reagent, 2- (4-methyl-pe
Unenyl) -9,10-anthraquinone (molecular weight 29
0) 3 grams were dissolved in 1 liter of methanol solvent
The solution was measured for its space velocity (SV, unit: 1 / hr)
E) By passing the liquid through the storage container at the amount of 2
The redox reaction reagent dissolved in methanol is placed in a container.
Adsorb on the synthetic polymer adsorbent in the
As a replacement operation, methanol and desalted water were each 50 volumes.
% Of the solution stored in the storage container with a solvent solution consisting of
Replacement of the methanol solution in which the
And solvent exchange stored in the containment vessel with desalinated water.
The replacement operation of the solvent solution used for the replacement was performed. Here, the synthetic polymer is adsorbed and carried by the adsorbent.
When the amount of the redox reaction reagent was measured,
98 grams per liter of synthetic polymer adsorbent
The concentration was 0.068 mol. <Metal ion filled in metal ion treatment vessel
Reduction of treatment agent> Synthetic polymer adsorbent in the containment vessel
The redox reaction reagent adsorbed and supported on
100% aqueous sodium hydrosulfite solution
After performing the reduction treatment operation with the turtle and SV2,
Washing was performed with 300 ml of the exchange-treated demineralized water. <Standard metal ion treatment> Divalent copper is added to raw water
Ion (2000 millimeters equivalent of cupric chloride per liter)
Grams; 945 milligrams / liter as copper ions)
The wastewater containing water is filled with the metal ions that have been subjected to the aforementioned reduction treatment.
The space velocity (SV) 3 passes through the packed metal ion processing vessel.
After adjusting the liquid volume and passing the liquid, the treated water outlet line
Of copper ion was 450 milliliters as a result of IPC emission analysis.
0.01 mm per liter even after passing through
Gram or less. Mercury ion (second bromide water per liter)
1000 milligrams in terms of silver; about 740 as mercury ions
(Milligrams / liter)
Inside the metal ion treatment vessel filled with metal ions
Is adjusted to the flow rate of the space velocity (SV) 3 in the same manner.
As a result, the mercury ion concentration at the outlet line of the treated water was
As a result of IPC emission analysis, after passing 1,500 ml
At less than 0.01 milligram per liter
there were. The results are as shown in Table 1. [Table 1] Example 2 The same operation as in Example 1 was performed.
Glass storage container (column) (diameter 22 mm
Metal ion prepared within 300 mm height)
In order to use the treatment agent repeatedly, perform the reduction treatment and cleaning.
The raw water contains divalent copper ions (cupric chloride per liter)
2000 mg in conversion; 945 mg as copper ion
Ram / liter) to a space velocity (SV) of 3
And adjust the flow rate of the treated water.
Constant concentration (for example, 2 ml of copper per liter as effluent standard)
Stop the flow of raw water when it exceeds
Ion treatment was performed. <Metal ion filled in metal ion treatment vessel
Deionization treatment of treatment agent> 36% concentrated hydrochloric acid 100M
By passing liquid through a space velocity (SV) of 1.
Monovalent copper deposited and trapped on the metal ion treatment agent
The ion is eluted, and then 300 desalted water is added.
Perform the replacement operation with a small amount, and the total amount of eluted copper is IC
Quantified by P emission spectroscopy, the total copper in the raw water
The treatment rate of copper with respect to the amount was calculated. <Metal ion filled in metal ion treatment container
Treatment of metal ion treatment agent> on the metal ion treatment agent in the container
Redox reagent adsorbed and supported on
100 ml of drosulfite sodium aqueous solution
, A redox processing operation with space velocity (SV) 2
The raw water was repeatedly subjected to metal ion treatment. The result
As a result, remarkable metal ion treatment was obtained even after 10 repetitions.
There was no decrease in the ability. The results are shown in Table 2.
It is on the street. [Table 2] [Example 3] <Preparation of metal ion treating agent>
Solid porous carrier in a 10-liter eggplant-shaped flask
2,300 grams of particles wet with methanol
A synthetic polymer adsorbent in the form of a gel (same as in Example 1),
As a redox reaction reagent, 2-ethylanthra
354 grams of quinone (molecular weight 236)
After adding 2.5 liters of propanol,
Attach to the evaporator and dissolve 2-ethylanthraquinone.
Until the solution disappears, keep it under rolling at a hot water bath temperature of 80 ° C.
2-Ethyl anthraquino dissolved in sopropanol
Adsorb on the adsorbent in the container, and then heat at the same temperature.
560 mm of mercury under reduced pressure while thermal rolling
The solvent is gradually distilled off, and the particle surface of the synthetic polymer adsorbent is removed.
Was evaporated to a dry state. Dry synthetic poly
The mer adsorbent is poured into desalted water when hot and stirred.
Not supported by synthetic polymer adsorbent that floats
The 2-ethylanthraquinone with desalted water
And refined and kept wet. Here, the synthetic polymer is adsorbed and carried by the adsorbent.
Measurement of the amount of 2-ethylanthraquinone
And converted to the concentration per liter of synthetic polymer adsorbent
Then, it was 0.4 mol. <Metal ion filled in metal ion treatment container
Reduction treatment of the treatment agent>
Synthetic polymer adsorbent loaded with ethylanthraquinone
3.7 liters used as metal ion treatment agent in wastewater
130mm in diameter and 1000m in height
Stored in a metal ion processing container (1)
5% hydrosulfur
Sodium wite solution 6 liters, space velocity (SV) 4
After performing the reduction treatment operation,
Washed with 6 liters of brine. <Standard metal ion treatment> Divalent copper ions (1 l
2000 milligrams of cupric chloride equivalent per liter,
Wastewater containing about 945 mg / l as on)
At a space velocity (SV) of 7.5. The concentration of copper ions at the outlet line of the treated water was adjusted to I
Measured by CP emission analysis, the concentration of copper ions contained in the processing solution
Of copper from the concentration of copper ions in raw water with respect to temperature
The rate was calculated. The results are as shown in Table 3. [Table 3] Example 4 The same operation as in Example 3 was performed.
Treatment of metal ions in wastewater
2-ethylanthraquinone for use in synthetic
Loaded with 0.4 moles per liter of mer adsorbent
3.7 liters of a metal ion treatment agent with a diameter of 130 mm
Torr, 1000 mm height metal ion processing vessel
(1) Stored inside and set in metal ion treatment system
And 5% hydrosulfur prepared in the reducing solution tank (2).
Sodium wite solution 6 liters, space velocity (SV) 4
After performing the reduction treatment operation,
Washed with 6 liters of brine. <Standard metal ion treatment> Divalent copper is added to raw water
Ion (150 mg in cupric chloride equivalent per liter)
Ram, about 71 milligrams / liter as copper ions),
Wastewater containing a large amount of ammonium chloride and urea derivatives,
The liquid was passed at an adjusted space velocity (SV) of 3. The concentration of copper ions at the outlet line of the treated water was adjusted to I
Measured by CP emission spectroscopy, contained in processing solution
Is copper ion concentration in raw water relative to copper ion concentration?
The copper treatment rate was calculated. The results are as shown in Table 4.
is there. [Table 4] According to the present invention, redo is formed on a solid porous carrier.
Carrying metal reaction reagents, complete as a metal ion treatment agent
Removal or economical repeated use
When used to treat metal ions in
Selectively convert divalent metal ions into monovalent metal ions
The divalent metal ion is changed to an aqueous solution by a reduction reaction treatment.
By separating and capturing sediment on solid porous carrier
Completely removed or further reduced to the monovalent metal ion.
From the aqueous solution efficiently without being turned on.
And elute and reuse the monovalent metal ions.
It is possible regardless of the size of the model and it is easy to handle
The system has been realized. [0046]

BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1] [Metal ion treatment vessel] via [Deionization treatment of metal ion treatment agent filled in metal ion treatment vessel] if necessary FIG. 4 is an explanatory diagram of a system for treating metal ions in wastewater, which is composed of a series of operations switched or repeated in the order of [reduction treatment of metal ion treatment agent filled in water]. [Explanation of Signs] 1 Metal ion treatment vessel (stand-by) 2 Reduction solution tank 3 Demetalization ion treatment solution tank 4 Replacement washing water tank a Raw water inlet line b Treated water outlet line

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-207543 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C02F 1/70 C02F 1/62 C09K 3 / 00 B01J 20/22 C02F 1/28 B01J 39/16 B01D 15/00

Claims (1)

(57) [Claim 1] Anthrahydroxy on a solid porous carrier
Non, selected from hydrogenated compounds thereof and substituted products thereof.
Organic reagents with reversible oxidation-reduction ability
It is called "redox reaction reagent". ) Is carried and utilizing the selective reduction performance of the carried redox reagent,
A treating agent for copper or mercury ions in wastewater, which converts divalent copper or mercury ions in wastewater into l-valent metal ions and traps and removes the metal ions. 2. The wastewater according to claim 1, wherein the solid porous carrier is silicon dioxide particles , carbon particles, organic synthetic polymer particles, or a molded product thereof.
Treatment agent for copper ions or mercury ions . 3. A solid porous carrier is mixed with a redox reaction reagent and a solvent in which the reagent is dissolved, and the solvent is gradually distilled off to adsorb the reagent on the solid porous carrier in a saturated state. After the reagent is supported by exchanging the solvent or drying to dryness, if necessary, the redox reaction reagent not supported on the solid porous carrier is washed away with desalted water to adjust the refining. The method for producing a treating agent for copper ions or mercury ions in wastewater according to claim 1, wherein 4. Use of the treating agent according to claim 1 in drainage
Divalent copper or mercury ions into monovalent metal ions
Copper ions in wastewater characterized by changing and capturing
How to treat mercury ions. 5. Divalent copper ions or water contained in waste water
Silver ion (hereinafter referred to as copper ion or mercury ion
It is called on. ) Is selectively reduced in a flowing aqueous solution, a vessel containing the treating agent according to claim 1 is connected in series or parallel to a pipeline, and a raw aqueous solution containing a divalent metal ion to be treated is connected to the container. To reduce to l-valent metal ions,
If necessary, a solution for eluting lvalent metal ions separated and deposited on a solid porous carrier is eluted out of the system and then eluted out of the system, and then a reducing solution is passed to a container containing the treating agent. By doing so, the treating agent is returned to the reduction treatment system again, and the divalent metal ions in the wastewater are repeatedly selectively reduced to monovalent metal ions, and the divalent metal ions in the wastewater are reduced to 1 A system for treating metal ions in wastewater, wherein the system is recovered as a multivalent metal ion.