JP7190959B2 - Water purification agent and water purification method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a water purification agent and a water purification method using the water purification agent.

In recent years, in the process of manufacturing various products in factories, a large amount of waste liquid containing environmentally hazardous substances such as metal ions and fluorine ions as inorganic ions is generated.

Conventional water purification agents require inorganic flocculants such as iron chloride, aluminum sulfate, and polyaluminum chloride (PAC) for insolubilization of inorganic ions. If a large amount of inorganic flocculant is added, the amount of sludge generated (sludge water content) increases and chemical costs increase.
Therefore, for example, it is disclosed that the addition amount of the inorganic flocculant can be reduced by using a flocculant composed of polyaluminum chloride having a specific basicity and a dimethyldiallylammonium chloride-based polymer (for example, Patent Document 1 reference).
A water purifying agent comprising a granule containing a mixture of Chosaku jute powder and a polymer flocculant, wherein the granule has a median diameter (D ₅₀ ) of 250 μm or more and 850 μm or less. has been proposed (see, for example, Patent Document 2).

Japanese Patent No. 6028826 Japanese Patent No. 6133348

With the technique described in Patent Document 1, even if the amount of inorganic flocculant used can be reduced, it is not possible to reduce the amount of sludge generated due to a decrease in the sludge moisture content.
In addition, Patent Document 2 discloses a water purification performance that can reduce the concentration of inorganic ions to a desired concentration or less in a short period of time. There is no description or suggestion about the effect of reducing the amount of sludge generated, and the water has excellent water purification performance, can reduce the amount of inorganic coagulant used, and can reduce the amount of sludge generated by lowering the sludge moisture content. It has been desired to provide a cleaning agent.

An object of the present invention is to solve the above-mentioned conventional problems and to achieve the following objects. That is, an object of the present invention is to provide a water purification agent which has excellent water purification performance, can reduce the amount of inorganic coagulant used, and can reduce the amount of sludge generated by lowering the water content of sludge.

Means for solving the above problems are as follows. Namely
<1> A water purification agent comprising granules containing a mixture of Nagasaku jute powder and a polymer flocculant,
The water depurator is characterized in that the granules have a cumulative ₁₀ % volume particle diameter D10 of 100 μm or more and 400 μm or less and a cumulative ₉₀ % volume particle diameter D90 of 800 μm or more and 1,200 μm or less.
<2> The water depurator according to <1>, wherein the Nagasaku jute and the polymer flocculant have a mass composition ratio of 9:1 to 1:9.
<3> The water purifying agent according to any one of <1> to <2> above, wherein the Changsaku jute is "Chong Jute No. 4" of Kokukan Hemp 2013, the appraisal number by the Hemp Research Institute of the Chinese Academy of Agricultural Sciences. is.
<4> Any of the above <1> to <3>, wherein the Changsaku jute has an appraisal number by the Hemp Research Institute of the Chinese Academy of Agricultural Sciences that is ""Naka Jute No. 3" in Wanjin ▲Gan ▼ Registration No. 1209006 It is a water purification agent according to.
<5> Any one of <1> to <4> above, wherein the Changsaku jute is "Chinese red hemp" with an appraisal number by the Hemp Research Institute of the Chinese Academy of Agricultural Sciences, which is Wanjin ▲Gan▼ Registration No. 1209001. is a water purifier.
<6> The water depurator according to any one of <1> to <5>, wherein the polymer flocculant is polyacrylamide.
<7> The polyacrylamide is the water depurator according to <6>, which contains an acrylate or a carboxylate.
<8> A kneading step of mixing Chosaku jute powder and a polymer flocculant, adding water and kneading to obtain a kneaded product;
A stretching and sheeting step of forming the kneaded product into a sheet by a stretching method to obtain a sheet-shaped molded product;
A drying step of drying the obtained sheet-like molding to obtain a dried sheet;
a pulverizing step of pulverizing the dried sheet;
A method for producing a water purifier, comprising:
<9> The water purification agent according to any one of <1> to <7> is dissolved in water to obtain a dispersion of Nagasaku jute powder and a polymer flocculant, which is added to wastewater containing inorganic wastes. A water purification method characterized by removing inorganic wastes in waste water by providing the dispersion liquid.
<10> The wastewater according to <9> above, wherein the wastewater contains inorganic wastes containing at least one of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, tin, and lead. water purification method.
<11> Insolubilization treatment for at least one of inorganic ions selected from nickel ions, fluoride ions, iron ions, copper ions, zinc ions, chromium ions, arsenic ions, cadmium ions, tin ions, and lead ions in the inorganic unwanted matter The water purification method according to <10>, wherein the dispersion is subjected to the drainage after applying the.
<12> The water purification method according to <11>, wherein the amount of the inorganic flocculant used in the insolubilization treatment is 4,500 ppm or less.

According to the present invention, the above-mentioned problems in the conventional art can be solved and the above-mentioned objects can be achieved. It is possible to provide a water depurator capable of reducing the amount generated.

FIG. 1 is a diagram showing appraisal numbers of "Chujuma No. 3" and "Chukoma" used in the present invention.

(Water purification agent)
The water purification agent of the present invention is a water purification agent comprising granules containing a mixture of Nagasaku jute powder and a polymer flocculant, wherein the cumulative ₁₀ % volume particle diameter D10 of the granules is 100 μm. 400 μm or less, and the cumulative ₉₀ % volume particle diameter D90 is 800 μm or more and 1,200 μm or less.

In order to provide a water purifying agent with excellent water purifying performance, the present inventors have extensively studied a water purifying agent containing plant powder. As a result, the cumulative 10% volume particle diameter D ₁₀ and the cumulative 90% volume particle diameter D ₉₀ of the granules obtained by kneading the Nagasaku jute powder and the polymer flocculant were within specific ranges. It was found that the water purification performance is excellent, the amount of inorganic flocculant used can be reduced, and the amount of sludge generated can be reduced by reducing the sludge water content.

Although the reason is not clear, it is considered as follows.
In the present invention, industrial wastewater, for example, industrial wastewater containing inorganic wastes such as nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, tin, and lead, is targeted, and inorganic wastes are removed from the wastewater. In order to remove (also called "water purification"), inorganic ions such as nickel ions, fluoride ions, and iron ions in inorganic wastes are insolubilized by an inorganic flocculant, and suspended solids (in the present invention, " (also referred to as "microflocs") are formed, the microflocs are aggregated and sedimented, and solid-liquid separation is performed. When using granules made of Nagasaku jute powder and a polymer flocculant for such water purification,
(i) the polymer flocculant promotes microflocculation of inorganic ions in the wastewater;
(ii) the Changsaku jute powder enhances the adsorption effect of inorganic ions in the wastewater;
(iii) It is believed that the pores present in the powder of Chosaku jute enhance the effect of adsorbing microflocs.

At that time, if Nagasaku jute rapidly absorbs water and settles, the above-mentioned adsorption effect cannot be exhibited, and on the other hand, if the porous part of the Nagasaku jute fiber does not come into sufficient contact with the drainage, The above effects (ii) and (iii) by Nagasaku jute having a cation exchange function cannot be exhibited.
When the cumulative 10% volume particle diameter D10 of the granules is less than ₁₀₀ μm and the cumulative ₉₀ % volume particle diameter D90 is less than 800 μm, the specific surface area of the granules becomes small, and the adsorption effect of the granules cannot be fully demonstrated.
On the other hand, since Changsaku jute settles slowly during purification, the particle size of the granules can be relatively large, but the cumulative ₁₀ % volume particle diameter D10 of the granules exceeds 400 μm, and the cumulative If the ₉₀ % volume particle diameter D90 exceeds 1200 μm, the sedimentation velocity will be too high, and the adsorption effect of the granules cannot be exhibited sufficiently.
Therefore, the granules in which the cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 are in a specific range can fully utilize the characteristics of Nagasaku jute, and the adsorption effect of sufficient microfloc It is thought that the amount of inorganic coagulant used for insolubilizing inorganic ions can be reduced, and the amount of sludge generated can be reduced by reducing the sludge water content.

The granules defined in the present invention can be preferably produced by the production method described below.
A specific configuration of the water purification agent will be described below.

<Nagasaku Jute>
The Nagasaku jute powder can be preferably used because it has a high cation exchange function and has pores capable of adsorbing microflocs in the wastewater containing the inorganic ions.
Leaves or stems can be preferably used as parts of Nagasaku jute.

In addition, among the Changsaku jute, there is Changsaku jute from Changsha, China, or the appraisal number by the Hemp Research Institute of the Chinese Academy of Agricultural Sciences is Guokan Hemp 2013, "Chong Jute No. 4", and the appraisal number is 皖品 ▲Kan ▼. "Nakajuma No. 3" with registered letter No. 1209006, "Nakajuma No. 1" with appraisal number XPD005-2005, or "Nakajuma No. 1" with appraisal number No. 1209001 can be preferably used. Furthermore, the above-mentioned "Nakajuma No. 4", the above-mentioned "Nakajuma No. 3", and the above-mentioned "Nakajuma" are more preferred, and the above-mentioned "Nakajuma No. 4" is particularly preferred.
Fig. 1 shows the appraisal numbers of "Nakajuma No. 3" and "Nakakoma".

The above-mentioned "Middle Jute No. 4" has the following properties.
Agricultural product type: Jute Variety source: Shojute No. 3 x 0-4 (l) Crossed F1 generation and Shojute No. 3. It is a green stem, with a cylindrical stem, needle-like leaves with scattered leaves, green petioles, small corners with the main stem, and lateral buds and stipules. The calyx is green, the long fruit is cylindrical, and the seeds are late-ripening.

<Polymer flocculant>
The polymer flocculant is not particularly limited as long as it exhibits the effect of removing the inorganic wastes in the wastewater, as with the Nagasaku jute, and can be appropriately selected according to the purpose. Examples thereof include polyacrylamide (PAM), partially hydrolyzed salts of polyacrylamide, polyamines, sodium alginate, sodium polyacrylate, sodium carboxymethylcellulose (CMC) and the like. Among these, polyacrylamide is preferred.
Polyacrylamides include, for example, those having acrylates or carboxylates.
Commercially available products can be used as the polyacrylamide, and examples of the commercially available products include Flopan AN934 (polyacrylamide having an acrylate in the side chain), Flopan AN913 (polyacrylamide having a carboxylate in the side chain). ) (both manufactured by SNF Co., Ltd.).

<Granulated mixture of Chosaku jute powder and polymer flocculant>
The mass composition ratio of the Chosaku jute powder and the polymer flocculant is preferably 9:1 to 1:9, more preferably 5:5 to 1:9, and even more preferably 3:7 to 1:9. Within this mass composition ratio range, excellent water purification performance with sufficient microfloc adsorption effect is exhibited. The mass composition ratio can be calculated based on the dry mass.
The granules exhibit the following properties.

<< Cumulative 10% volume particle diameter D ₁₀ , Cumulative 90% volume particle diameter D ₉₀ >>
The granules defined in the present invention have a cumulative ₁₀ % volume particle diameter D10 of 100 μm or more and 400 μm or less, and a cumulative ₉₀ % volume particle diameter D90 of 800 μm or more and 1,200 μm or less.
When the cumulative ₁₀ % volume particle diameter D10 of the granules is 100 μm or more and 400 μm or less, and the cumulative ₉₀ % volume particle diameter D90 is 800 μm or less, the adsorption effect of microfloc by Nagasaku jute powder is sufficiently obtained. can be demonstrated.
When the cumulative ₁₀ % volume particle diameter D10 of the granules is less than 100 μm, fine powder is generated, and there is concern about problems during production and generation of dust during charging.
On the other hand, when the _D90 exceeds 1200 μm, insoluble matter is generated, and there is concern about clogging of pipes and deterioration of water treatment efficiency.
In addition, when D ₁₀ exceeds 400 μm and D ₉₀ is less than 800 μm, D ₅₀ (median diameter) of the granules may deviate from the region where good water purification performance is exhibited.
Here, the particle diameter of the 10% cumulative portion from the small particle side measured based on the volume-based particle size distribution is referred to as the cumulative ₁₀ % volume particle diameter D10, and the small particles measured based on the volume-based particle size distribution. The particle diameter of the 90% cumulative portion from the side is called the cumulative ₉₀ % volume particle diameter D90.
Also, the _D10 and _D90 can be measured by a commercially available particle size distribution analyzer such as Mastersizer 2000 (manufactured by Malvern Instruments).

<Method for producing granules>
The granules defined in the present invention include a kneading step of mixing the Nagasaku jute powder and the polymer flocculant, adding water and kneading to obtain a kneaded product, and stretching the kneaded product into a sheet form. a step of stretching and sheeting to obtain a sheet-like molded product, a drying step of drying the sheet-like molded product to obtain a dried sheet, and a pulverizing step of pulverizing the dried sheet manufactured by the method.
Furthermore, a classification step of classifying the granules with a sieve may be included after the pulverization step.

The inventors of the present invention have confirmed by experiments that if too strong a shearing force (shear) is applied to the kneaded material during granulation, the polymer flocculant enters into the porous portions of the fibers of Nagasaku jute.
The granules have a porous shape in which voids (porous) with many holes are present due to the fibrous structure of Nagasaku jute.
When granules were produced by a granulation method using a stretching and sheeting process, it was possible to control the share of the kneaded product. It was found that the porous portion of the jute can be sufficiently secured, and that it exhibits a good adsorption effect on inorganic wastes.

Further, in the stretching/sheet forming process, the kneaded material is gradually stretched by rollers, and step by step, a sheet-like molding having a predetermined thickness is formed. According to this method, the molded product can be produced while the viscosity of the kneaded product is maintained at a good level. I don't think so.

In the kneading step, the dried Nagasaku jute is coarsely pulverized and then finely pulverized to obtain a Nagasaku jute powder of a desired size. It is mixed with a molecular flocculant, added with water, and kneaded.
Here, the amount of water to be added is preferably, for example, about three times the total mass of the mixture of Nagasaku jute powder and the polymer flocculant.
The kneading is preferably carried out by using a mixer, for example, a vertical mixer such as a planetary mixer, and setting the rotation speed and time within a predetermined range.
The rotation speed and time during kneading in the mixer can be appropriately set while considering conditions such as the mixing ratio of Nagasaku jute powder and the polymer flocculant. is preferred, and the time is preferably 5 to 25 minutes.
In the stretching/sheet forming step, the obtained kneaded product is preferably stretched by a stretching method using a roller so as to have a thickness of 4 mm to 20 mm, preferably about 10 mm, and formed into a sheet.

In the kneading step, conditions such as the mixing ratio of the Nagasaku jute powder and the polymer, the amount of water added, the mixing speed (the number of revolutions of the mixer during kneading), the mixing time (kneading time in the mixer), or the stretching and By appropriately changing the stretching conditions in the sheeting process, the shear applied to the kneaded product can be controlled.

In the drying step, it is preferable to dry the obtained molded product at a temperature of 80° C. to 150° C. for 2 to 12 hours using a multi-stage hot air dryer.
In the pulverization step, pulverization is preferably carried out using a pulverizer such as an airflow ultrafine pulverizer so that the median diameter is in the range of 250 μm to 850 μm.
In the classification step, the pulverized powder is classified using a classifier such as a vibrating sieve or a cartridge sieve, and the cumulative ₁₀ % volume particle diameter D10 is 100 μm or more and 400 μm or less, and the cumulative 90% volume particle diameter It is preferable to classify the granules so that the _D90 is 800 μm or more and 1,200 μm or less.
Furthermore, in the present invention, granules less than 100 μm and granules larger than 1200 μm are sieved to actively separate and exclude (cut), and only granules with a particle size in the range of 100 μm or more and 1,200 μm or less are used. Then it is more preferable.

(Water purification method)
In the water purification method of the present invention, the water purification agent of the present invention described above is dissolved in water to obtain a dispersion of Nagasaku jute powder and a polymer flocculant, and the dispersion is subjected to waste water, whereby Remove inorganic waste.
Examples of the inorganic waste include inorganic waste containing at least one of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, tin, and lead.

The water purification method of the present invention will be specifically described.
Inorganic ions such as nickel ions, fluoride ions, and iron ions in inorganic wastes in wastewater are subjected to an insolubilization treatment by adding an inorganic coagulant to form microflocs. The effluent is provided with the above-described dispersion in the form of an aqueous solution of 0.1% to 0.2% by weight. Then, the microflocs are aggregated and sedimented, and the sedimented sediment is removed to purify the waste water.
In the insolubilization treatment, for example, a base is added to the waste water to make the waste water basic, and then an inorganic coagulant is added to insolubilize the inorganic ions.
Examples of inorganic flocculants include ferric chloride, polyferric sulfate, ferrous sulfate, aluminum sulfate, polyaluminum chloride (PAC), and slaked lime.
The amount of the inorganic flocculant used is not particularly limited, and varies depending on the type of wastewater, the amount of inorganic wastes in the wastewater, the type of inorganic flocculant, etc., and cannot be defined unconditionally, but is 4,500 ppm or less. is preferred, and 4,000 ppm or less is more preferred.
The polymer flocculant may be added alone after adding the base to the waste water, adding the inorganic flocculant, and before adding the water purification agent of the present invention. If a polymer flocculant is added alone before adding the water purifying agent of the present invention, the floc size of micro flocs in the waste water can be increased.

Examples of the present invention will be described below, but the present invention is not limited to these examples.

(Example 1)
<Drainage>
As waste water to be treated, Zn and Ni-based raw water waste water (Zn concentration: 300 ppm, Ni concentration: 100 ppm) was used.

<Primary aggregation>
Next, 5,000 ppm of polyaluminum chloride (PAC) as an inorganic coagulant was added to the above waste water, and the mixture was stirred while adding sodium hydroxide so that the pH became 8.0. By this operation, the wastewater was separated into a supernatant containing microflocs and a sediment.

<Preparation of water purification agent>
Next, Changshu jute (produced in Changsha City, China) and a polymer flocculant (polyacrylamide (PAM1), Flopan AN913, polyacrylamide having a carboxylate in the side chain, manufactured by SNF Co., Ltd.) A granule having a mass composition ratio of 2:8 was produced by the manufacturing method shown below to obtain a granule, and this granule was used as water purification agent A1.

<<Method for producing water purification agent>>
A kneaded product (Nagasaku jute powder + polymer flocculant + water = 30 kg) is placed in a planetary mixer (manufactured by Aikosha Seisakusho Co., Ltd., mixer ACM-110, capacity 110 L), and kneaded with a shear under the conditions of a rotation speed of 80 rpm and mixing for 15 minutes. did.
The resulting kneaded material was stretched by rollers using a press (45t press machine manufactured by Komatsu Sanki Co., Ltd.) to prepare a sheet-like molding having a thickness of about 10 mm.
This molding was dried at 120° C. for 3 hours and further at 150° C. for 2 hours using a multi-stage hot air dryer (manufactured by Nanayo Seisakusho Co., Ltd., rack-type oven).
Next, the dried sheet was pulverized using an airflow ultrafine pulverizer (Selene Miller, manufactured by Masuko Sangyo Co., Ltd.).
Next, the obtained pulverized product is mixed at a ratio of 60% (A), 20% (B), and 20% (C) as follows, and the cumulative 10% volume particle diameter of the granulated product The D10 was adjusted to 282 μm, and the cumulative ₉₀ % volume particle diameter _D90 was adjusted to 962 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) Particles larger than 1000 μm in diameter are sifted through a sieve with a nominal opening of 1 mm (mesh No. 18), and particles smaller than 300 μm in diameter are sifted through a sieve with a nominal opening of 300 μm (mesh No. 50) to remove them.
(B) Particles larger than 300 μm are sifted through a sieve with a nominal opening of 300 μm (mesh No. 50), and particles smaller than 250 μm are sifted through a sieve with a nominal opening of 250 μm (mesh No. 60).
(C) Particles larger than 1000 μm in diameter are sifted through a sieve with a nominal opening of 1 mm (mesh No. 18), and particles smaller than 850 m in diameter are sifted through a sieve with a nominal opening of 850 μm (mesh No. 20) to remove them.
As described above, a granule was obtained, and this granule was used as water purification agent A1.

<Purification treatment>
Next, the obtained water depurator A1 was dissolved in water to prepare a 0.1% by mass aqueous dispersion. This dispersion was added dropwise at a rate of 3 mL/min to the waste water consisting of the supernatant containing the microflocs and the sediment while stirring. At this time, the water purification agent A1 was added so as to be 15 ppm with respect to the solid content in the waste water. Here, the method for measuring the "solid content" was determined by measuring the slurry concentration in the waste water with a moisture meter and calculating back.
After dropping, stirring was maintained for 1 minute, and then "Zn concentration and Ni concentration", "amount of suspended solids (SS)", and "sludge water content" were measured as follows. Table 1 shows the results.

<Measurement of Zn and Ni concentrations>
The supernatant was sampled 60 seconds after the stirring was stopped, and the Zn concentration and Ni concentration were measured with a high frequency inductively coupled plasma emission spectrometer ICP-AES (manufactured by SPECTRO).

<Amount of suspended solids (SS)>
Two minutes after stopping the stirring, the supernatant was sampled, and the absorbance at a wavelength of 810 nm was measured using a spectrophotometer (DR2800, manufactured by HACK) to measure the amount of suspended solids (SS).

<Water content of sludge>
The test water was filtered and collected, and the mass A of the sludge was measured. Subsequently, the mass B of the sludge made absolutely dry (water content of 0.05% or less) in an oven at 105° C. was measured. Here, a heat drying type moisture meter MX-50 (manufactured by A&D Co., Ltd.) was used to confirm the moisture content. From these, the sludge water content was obtained by dividing the mass of water contained in the sludge (A−B) by the mass of the sludge (A) and calculating the percentage.

(Example 2)
Purification treatment was performed in the same manner as in Example 1, except that in <primary aggregation> of Example 1, the amount of polyaluminum chloride (PAC) added was changed to 4,375 ppm. "Amount of suspended solids (SS)" and "sludge water content" were measured. Table 1 shows the results.

(Example 3)
Purification treatment was performed in the same manner as in Example 1, except that in <primary aggregation> of Example 1, the amount of polyaluminum chloride (PAC) added was changed to 3,750 ppm. "Amount of suspended solids (SS)" and "sludge water content" were measured. Table 1 shows the results.

(Example 4)
In the <<manufacturing method of water purification agent>> of Example 1, (A) was mixed at a ratio of 60%, (B) at 20%, and (C) at 20% as follows, and the granules were obtained. Granules were obtained in the same manner as in Example 1, except that the cumulative ₁₀ % volume particle diameter D10 was 100 μm and the cumulative ₉₀ % volume particle diameter D90 was adjusted to 800 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) Particles larger than 850 μm are sifted through a sieve with a nominal opening of 850 μm (mesh No. 20), and particles smaller than 150 μm are sifted through a sieve with a nominal opening of 150 μm (mesh No. 100).
(B) Particles larger than 125 μm are sifted through a sieve with a nominal opening of 125 μm (mesh No. 120), and particles smaller than 75 μm are sifted through a sieve with a nominal opening of 75 μm (mesh No. 200).
(C) Particles larger than 850 μm are sifted through a sieve with a nominal opening of 850 μm (mesh No. 20), and particles smaller than 710 μm are sifted through a sieve with a nominal opening of 710 μm (mesh No. 25).

Using the water purification agent A1 composed of the obtained granules, purification treatment was performed in the same manner as in Example 2, and "Zn concentration and Ni concentration", "amount of suspended solids (SS)", and "sludge Moisture content" was measured. Table 1 shows the results.

(Example 5)
In the <<manufacturing method of water purification agent>> of Example 1, (A) was mixed at a ratio of 60%, (B) at 20%, and (C) at 20% as follows, and the granules were obtained. Granules were obtained in the same manner as in Example 1, except that the cumulative ₁₀ % volume particle diameter D10 was 400 μm and the cumulative ₉₀ % volume particle diameter D90 was adjusted to 1200 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) Particles larger than 1180 μm in diameter are sifted through a sieve with a nominal opening of 1.18 mm (mesh No. 18), and those smaller than 500 μm are removed through a sieve with a nominal opening of 500 μm (mesh No. 35).
(B) Particles larger than 425 μm are sifted through a sieve with a nominal opening of 425 μm (mesh No. 40), and particles smaller than 355 μm are sifted through a sieve with a nominal opening of 355 μm (mesh No. 45).
(C) Particles larger than 1400 μm in diameter are sifted through a sieve with a nominal opening of 1.4 mm (mesh No. 14), and those smaller than 1000 μm are removed through a sieve with a nominal opening of 1 mm (mesh No. 18).

Using the water purification agent A1 composed of the obtained granules, purification treatment was performed in the same manner as in Example 2, and "Zn concentration and Ni concentration", "amount of suspended solids (SS)", and "sludge Moisture content" was measured. Table 1 shows the results.

(Example 6)
In the <<manufacturing method of water purification agent>> of Example 1, (A) was mixed at a ratio of 60%, (B) at 20%, and (C) at 20% as follows, and the granules were obtained. Granules were obtained in the same manner as in Example 1, except that the cumulative ₁₀ % volume particle diameter D10 was 200 μm and the cumulative ₉₀ % volume particle diameter D90 was adjusted to 900 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) Particles larger than 850 μm are sifted through a sieve with a nominal opening of 850 μm (mesh No. 20), and particles smaller than 150 μm are sifted through a sieve with a nominal opening of 150 μm (mesh No. 100).
(B) Particles larger than 250 m in diameter are sifted through a sieve with a nominal opening of 250 µm (mesh No. 60), and particles smaller than 150 µm are sifted through a sieve with a nominal opening of 150 µm (mesh No. 60).
(C) Particles larger than 1180 μm are sifted through a sieve with a nominal opening of 1180 μm (mesh No. 16), and particles smaller than 850 μm are sifted through a sieve with a nominal opening of 850 μm (mesh No. 20).

Using the water purification agent A1 composed of the obtained granules, purification treatment was performed in the same manner as in Example 2, and "Zn concentration and Ni concentration", "amount of suspended solids (SS)", and "sludge Moisture content" was measured. Table 2 shows the results.

(Example 7)
In the <<manufacturing method of water purification agent>> of Example 1, (A) was mixed at a ratio of 60%, (B) at 20%, and (C) at 20% as follows, and the granules were obtained. Granules were obtained in the same manner as in Example 1, except that the cumulative ₁₀ % volume particle diameter D10 was 350 μm and the cumulative ₉₀ % volume particle diameter D90 was adjusted to 1100 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) Particles larger than 1000 μm in diameter are sifted through a sieve with a nominal opening of 1 mm (mesh No. 18), and particles smaller than 425 μm in diameter are sifted through a sieve with a nominal opening of 425 μm (mesh No. 18) to remove them.
(B) Particles larger than 425 μm in diameter are sifted through a sieve with a nominal opening of 425 μm (mesh No. 18), and those smaller than 300 μm are removed through a sieve with a nominal opening of 300 μm (mesh No. 50).
(C) Particles larger than 1180 μm are sifted through a sieve with a nominal opening of 1180 μm (mesh No. 16), and particles smaller than 1 mm are sifted through a sieve with a nominal opening of 1 mm (mesh No. 18).

Using the water purification agent A1 composed of the obtained granules, purification treatment was performed in the same manner as in Example 2, and "Zn concentration and Ni concentration", "amount of suspended solids (SS)", and "sludge Moisture content" was measured. Table 2 shows the results.

(Example 8)
In the <<manufacturing method of water purification agent>> of Example 1, in the same manner as in Example 1, except that 750 g of Nagasaku jute powder and 6750 g of polymer flocculant (polyacrylamide (PAM1)) were changed. A granule having a mass composition ratio of Nagasaku jute and a polymer flocculant of 1:9 was obtained, and this granule was designated as water purification agent A2.
Purification treatment was performed in the same manner as in Example 2, except that the obtained water purification agent A2 was used, and "Zn concentration and Ni concentration", "amount of suspended solids (SS)", and "sludge water content" was measured. Table 2 shows the results.

(Example 9)
In the <<manufacturing method of water purification agent>> of Example 1, in the same manner as in Example 1, except that 2250 g of Nagasaku jute powder and 5250 g of polymer flocculant (polyacrylamide (PAM1)) were changed. A granule having a mass composition ratio of Nagasaku jute and a polymer flocculant of 3:7 was obtained, and this granule was designated as water purification agent A3.
Purification treatment was performed in the same manner as in Example 2, except that the obtained water purification agent A3 was used, and "Zn concentration and Ni concentration", "amount of suspended solids (SS)", and "sludge water content" was measured. Table 2 shows the results.

(Example 10)
In the <<manufacturing method of water purification agent>> of Example 1, the polymer flocculant (polyacrylamide (PAM1)) was replaced with the polymer flocculant (polyacrylamide (PAM2), trade name: Flopan AN934, S.N. Co., Ltd. A granule was obtained in the same manner as in Example 1, except that F, polyacrylamide having an acrylate in the side chain was changed.
Purification treatment was performed in the same manner as in Example 2, except that the water purification agent A4 made of the obtained granules was used, and the "Zn concentration and Ni concentration", the "suspended solids (SS) amount", and The "sludge moisture content" was measured. Table 2 shows the results.

(Comparative example 1)
In Example 1, in the same manner as in Example 1, except that water purification agent A5 made of polymer flocculant A (N-110, manufactured by MT Aquapolymer Co., Ltd.) was used instead of water purification agent A1. Purification treatment was performed, and "Zn concentration and Ni concentration", "amount of suspended solids (SS)", and "sludge water content" were measured. Table 3 shows the results.

(Comparative example 2)
In Example 2, in the same manner as in Example 2, except that water purification agent A5 made of polymer flocculant A (N-110, manufactured by MT Aquapolymer Co., Ltd.) was used instead of water purification agent A1. Purification treatment was performed, and "Zn concentration and Ni concentration", "amount of suspended solids (SS)", and "sludge water content" were measured. Table 3 shows the results.

(Comparative Example 3)
In Example 3, in the same manner as in Example 3, except that water purification agent A5 made of polymer flocculant A (N-110, manufactured by MT Aquapolymer Co., Ltd.) was used instead of water purification agent A1. Purification treatment was performed, and "Zn concentration and Ni concentration", "amount of suspended solids (SS)", and "sludge water content" were measured. Table 3 shows the results.

(Comparative Example 4)
In the <<manufacturing method of water purification agent>> of Example 1, (A) was mixed at a ratio of 60%, (B) at 20%, and (C) at 20% as follows, and the granules were obtained. Granules were obtained in the same manner as in Example 1, except that the cumulative ₁₀ % volume particle diameter D10 was 90 μm and the cumulative ₉₀ % volume particle diameter D90 was adjusted to 790 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) 60% of the total amount of the granules is sieved with a nominal mesh size of 710 µm (mesh No. 18) for those with a particle size larger than 710 µm, and with a nominal mesh size of 150 µm (mesh No. 100) for those with a particle size smaller than 150 µm. remove.
(B) Particles larger than 75 μm in diameter are sifted through a sieve with a nominal opening of 75 μm (mesh No. 200), and particles smaller than 106 μm in diameter are sifted through a sieve with a nominal opening of 106 μm (mesh No. 140).
(C) Particles larger than 850 μm are sifted through a sieve with a nominal opening of 850 μm (mesh No. 20), and particles smaller than 710 μm are sifted through a sieve with a nominal opening of 710 μm (mesh No. 25).

Purification treatment was performed in the same manner as in Example 2, except that the water purification agent A1 made of the obtained granules was used, and the "Zn concentration and Ni concentration", the "suspended solids (SS) amount", and The "sludge moisture content" was measured. Table 3 shows the results.

(Comparative Example 5)
In the <<manufacturing method of water purification agent>> of Example 1, (A) was mixed at a ratio of 60%, (B) at 20%, and (C) at 20% as follows, and the granules were obtained. Granules were obtained in the same manner as in Example 1, except that the cumulative ₁₀ % volume particle diameter D10 was 410 μm and the cumulative ₉₀ % volume particle diameter D90 was adjusted to 1210 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) Particles larger than 1180 μm are sifted through a sieve with a nominal opening of 1180 μm (mesh No. 16), and particles smaller than 425 μm are sifted through a sieve with a nominal opening of 425 μm (mesh No. 40).
(B) Particles larger than 425 μm are sifted through a sieve with a nominal opening of 425 μm (mesh No. 40), and particles smaller than 355 μm are sifted through a sieve with a nominal opening of 355 μm (mesh No. 45).
(C) Particles larger than 1400 μm are sifted through a sieve with a nominal opening of 1400 μm (mesh No. 14), and particles smaller than 1180 μm are sifted through a sieve with a nominal opening of 1180 μm (mesh No. 16).

Purification treatment was performed in the same manner as in Example 2, except that the water purification agent A1 made of the obtained granules was used, and the "Zn concentration and Ni concentration", the "suspended solids (SS) amount", and The "sludge moisture content" was measured. Table 3 shows the results.

(Comparative Example 6)
In the <<manufacturing method of water purifier>> of Example 1, 60% of (A), 20% of (B), and 20% of (C) were mixed as follows, and granules were obtained. Granules were obtained in the same manner as in Example 1, except that the cumulative ₁₀ % volume particle diameter D10 was 90 μm and the cumulative ₉₀ % volume particle diameter D90 was adjusted to 962 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) Particles larger than 850 μm in diameter are sifted through a sieve with a nominal opening of 850 μm (mesh No. 20), and particles smaller than 106 μm in diameter are sifted through a sieve with a nominal opening of 106 μm (mesh No. 140).
(B) Particles larger than 106 μm are sifted through a sieve with a nominal opening of 106 μm (mesh No. 140), and particles smaller than 75 μm are sifted through a sieve with a nominal opening of 75 μm (mesh No. 200).
(C) Particles larger than 1 mm in diameter are sifted through a sieve with a nominal opening of 1 mm (mesh No. 18), and those smaller than 850 μm are removed through a sieve with a nominal opening of 850 μm (mesh No. 20).

Purification treatment was performed in the same manner as in Example 2, except that the water purification agent A1 made of the obtained granules was used, and the "Zn concentration and Ni concentration", the "suspended solids (SS) amount", and The "sludge moisture content" was measured. Table 4 shows the results.

(Comparative Example 7)
In the <<manufacturing method of water purification agent>> of Example 1, (A) was mixed at a ratio of 60%, (B) at 20%, and (C) at 20% as follows, and the granules were obtained. Granules were obtained in the same manner as in Example 1, except that the cumulative ₁₀ % volume particle diameter D10 was 282 μm and the cumulative ₉₀ % volume particle diameter D90 was adjusted to 790 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) Particles larger than 850 μm are sifted through a sieve with a nominal opening of 850 μm (mesh No. 20), and particles smaller than 300 μm are sifted through a sieve with a nominal opening of 300 μm (mesh No. 50).
(B) Particles larger than 300 μm are sifted through a sieve with a nominal opening of 300 μm (mesh No. 50), and particles smaller than 250 μm are sifted through a sieve with a nominal opening of 250 μm (mesh No. 60).
(C) Particles larger than 850 μm are sifted through a sieve with a nominal opening of 850 μm (mesh No. 20), and particles smaller than 710 μm are sifted through a sieve with a nominal opening of 710 μm (mesh No. 25).

Purification treatment was performed in the same manner as in Example 2, except that the water purification agent A1 made of the obtained granules was used, and the "Zn concentration and Ni concentration", the "suspended solids (SS) amount", and The "sludge moisture content" was measured. Table 4 shows the results.

(Comparative Example 8)
In the <<manufacturing method of water purification agent>> of Example 1, (A) was mixed at a ratio of 60%, (B) at 20%, and (C) at 20% as follows, and the granules were obtained. Granules were obtained in the same manner as in Example 1, except that the cumulative ₁₀ % volume particle diameter D10 was 410 μm and the cumulative ₉₀ % volume particle diameter D90 was adjusted to 962 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) Particles larger than 1 mm in diameter are sifted through a sieve with a nominal opening of 1 mm (mesh No. 18), and particles smaller than 425 μm in diameter are sifted through a sieve with a nominal opening of 425 μm (mesh No. 40) to remove them.
(B) Particles larger than 425 μm are sifted through a sieve with a nominal opening of 425 μm (mesh No. 40), and particles smaller than 355 μm are sifted through a sieve with a nominal opening of 355 μm (mesh No. 45).
(C) Particles larger than 1 mm in diameter are sifted through a sieve with a nominal opening of 1 mm (mesh No. 18), and those smaller than 850 μm are removed through a sieve with a nominal opening of 850 μm (mesh No. 20).

Purification treatment was performed in the same manner as in Example 2, except that the water purification agent A1 made of the obtained granules was used, and the "Zn concentration and Ni concentration", the "suspended solids (SS) amount", and The "sludge moisture content" was measured. Table 4 shows the results.

(Comparative Example 9)
In the <<manufacturing method of water purification agent>> of Example 1, (A) was mixed at a ratio of 60%, (B) at 20%, and (C) at 20% as follows, and the granules were obtained. Granules were obtained in the same manner as in Example 1, except that the cumulative ₁₀ % volume particle diameter D10 was 282 μm and the cumulative ₉₀ % volume particle diameter D90 was adjusted to 1210 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) Particles larger than 300 μm are sifted through a sieve with a nominal opening of 300 μm (mesh No. 50), and particles smaller than 1180 μm are sifted through a sieve with a nominal opening of 1180 μm (mesh No. 16).
(B) Particles larger than 300 μm are sifted through a sieve with a nominal opening of 300 μm (mesh No. 50), and particles smaller than 250 μm are sifted through a sieve with a nominal opening of 250 μm (mesh No. 60).
(C) Particles larger than 1400 μm are sifted through a sieve with a nominal opening of 1400 μm (mesh No. 14), and particles smaller than 1180 μm are sifted through a sieve with a nominal opening of 1180 μm (mesh No. 16).

Purification treatment was performed in the same manner as in Example 2, except that the water purification agent A1 made of the obtained granules was used, and the "Zn concentration and Ni concentration", the "suspended solids (SS) amount", and The "sludge moisture content" was measured. Table 4 shows the results.

(Comparative Example 10)
In Example 2, purification treatment was performed in the same manner as in Example 2, except that water purification agent A6 made of Nagasaku jute was used instead of water purification agent A1. Amount of material (SS)" and "sludge water content" were measured. Table 4 shows the results.

(Example 11)
<Drainage>
Fluorinated raw water wastewater (F concentration: 1,000 ppm) was used as the wastewater to be treated.

<Primary aggregation>
Next, 2,000 ppm of 15% by mass slaked lime as an inorganic flocculant was added to the waste water, and the mixture was stirred while adding 5% by mass of H ₂ SO ₄ so that the pH became 8. By this operation, the wastewater was separated into a supernatant containing microflocs and a sediment.

<Preparation of water purification agent>
Next, Changsaku jute (produced in Changsha City, China) and a polymer flocculant (polyacrylamide (PAM1), AN913, manufactured by SNF Co., Ltd., polyacrylamide having a carboxylate in the side chain) A granule having a mass composition ratio of 2:8 was produced by the manufacturing method shown below to obtain a granule, and this granule was used as water purification agent B1.

<<Method for producing water purification agent>>
A kneaded product (Nagasaku jute powder + polymer flocculant + water = 30 kg) is placed in a planetary mixer (manufactured by Aikosha Seisakusho Co., Ltd., mixer ACM-110, capacity 110 L), and kneaded with a shear under the conditions of a rotation speed of 80 rpm and mixing for 15 minutes. did.
The resulting kneaded material was stretched by rollers using a press (45t press machine manufactured by Komatsu Sanki Co., Ltd.) to prepare a sheet-like molding having a thickness of about 10 mm.
This molding was dried at 120° C. for 3 hours and further at 150° C. for 2 hours using a multi-stage hot air dryer (manufactured by Nanayo Seisakusho Co., Ltd., rack-type oven).
Next, the dried sheet was pulverized using an airflow ultrafine pulverizer (Selene Miller, manufactured by Masuko Sangyo Co., Ltd.).
Next, the resulting pulverized product is mixed at a ratio of 60% (A), 20% (B), and 20% (c) as follows, and the cumulative 10% volume particle diameter of the granules The D10 was adjusted to 282 μm, and the cumulative ₉₀ % volume particle diameter _D90 was adjusted to 962 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) Particles larger than 1000 μm in diameter are sifted through a sieve with a nominal opening of 1 mm (mesh No. 18), and particles smaller than 300 μm in diameter are sifted through a sieve with a nominal opening of 300 μm (mesh No. 50) to remove them.
(B) Particles larger than 300 μm are sifted through a sieve with a nominal opening of 300 μm (mesh No. 50), and particles smaller than 250 μm are sifted through a sieve with a nominal opening of 250 μm (mesh No. 60).
(C) Particles larger than 1000 μm in diameter are sifted through a sieve with a nominal opening of 1 mm (mesh No. 18), and particles smaller than 850 m in diameter are sifted through a sieve with a nominal opening of 850 μm (mesh No. 20) to remove them.
As described above, a granule was obtained and designated as water purification agent B1.

<Purification treatment>
Next, the obtained water depurator B1 was dissolved in water to prepare a 0.1% by mass aqueous dispersion. This dispersion was added dropwise at a rate of 3 mL/min to the waste water consisting of the supernatant containing the microflocs and the sediment while stirring. At this time, the water purification agent B1 was added so as to be 4.5 ppm with respect to the solid content in the waste water. Here, the method for measuring the "solid content" was determined by measuring the slurry concentration in the waste water with a moisture meter and calculating back.
After dropping, after maintaining stirring for 1 minute, the "F concentration" is measured as follows, and the "suspended solids (SS) amount" and "sludge water content" are measured in the same manner as in Example 1. did. Table 5 shows the results.

<Measurement of F concentration>
Two minutes after the stirring was stopped, the supernatant was sampled, and the fluorine (F) concentration was measured with a lambda (Λ) 9000 (manufactured by Kyoritsu Scientific Research Institute).

(Example 12)
In Example 11, purification treatment was performed in the same manner as in Example 11, except that the amount of slaked lime added in <primary flocculation> was changed to 1,800 ppm. ”, and “sludge moisture content” were measured. Table 5 shows the results.

(Example 13)
In Example 11, purification treatment was performed in the same manner as in Example 11, except that the amount of slaked lime added in <primary flocculation> was changed to 1,600 ppm. ”, and “sludge moisture content” were measured. Table 5 shows the results.

(Example 14)
In the <<manufacturing method of water purification agent>> of Example 11, (A) was mixed at a ratio of 60%, (B) at 20%, and (C) at 20% as follows, and granules were obtained. Granules were obtained in the same manner as in Example 1, except that the cumulative ₁₀ % volume particle diameter D10 was 200 μm and the cumulative ₉₀ % volume particle diameter D90 was adjusted to 900 μm. The cumulative ₁₀ % volume particle diameter D10 and the cumulative ₉₀ % volume particle diameter D90 were measured by Mastersizer 2000 (manufactured by Malvern Instruments).
(A) Particles larger than 850 μm are sifted through a sieve with a nominal opening of 850 μm (mesh No. 20), and particles smaller than 150 μm are sifted through a sieve with a nominal opening of 150 μm (mesh No. 100).
(B) Particles larger than 250 m in diameter are sifted through a sieve with a nominal opening of 250 µm (mesh No. 60), and particles smaller than 150 µm are sifted through a sieve with a nominal opening of 150 µm (mesh No. 60).
(C) Particles larger than 1180 μm are sifted through a sieve with a nominal opening of 1180 μm (mesh No. 16), and particles smaller than 850 μm are sifted through a sieve with a nominal opening of 850 μm (mesh No. 20).

Purification treatment was performed in the same manner as in Example 12, except that the water purification agent B1 made of the obtained granules was used, and the "F concentration", "amount of suspended solids (SS)", and "sludge water content rate” was measured. Table 5 shows the results.

(Example 15)
<Drainage>
As waste water to be treated, raw water waste water for plating (Cu concentration: 100 ppm) was used.

<Primary aggregation>
Next, 200 ppm of FeCl ₂ as an inorganic flocculant was added to the above waste water, and the mixture was stirred while adding Ca(OH) ₂ so that the pH became 11. By this operation, the wastewater was separated into a supernatant containing microflocs and a sediment.

Next, in Example 1, purification treatment was performed in the same manner as in Example 1 except that 6 ppm of the water purification agent A1 was added, and the "Cu concentration" was measured as described below. Then, the "amount of suspended solids (SS)" and the "sludge water content" were measured. Table 6 shows the results.

<Measurement of Cu concentration>
The supernatant was sampled 60 seconds after the stirring was stopped, and the Cu concentration was measured with a high frequency inductively coupled plasma emission spectrometer ICP-AES (manufactured by SPECTRO).

(Example 16)
In Example 15, purification treatment was performed in the same manner as in Example 15, except that FeCl ₂ was not added as an inorganic flocculant in <primary flocculation>. amount” and “sludge moisture content” were measured. Table 6 shows the results.

(Comparative Example 11)
In Example 15, in the same manner as in Example 15, except that water purification agent A5 made of polymer flocculant A (A-120, manufactured by MT Aquapolymer Co., Ltd.) was used instead of water purification agent A1. Purification treatment was performed, and "Cu concentration", "amount of suspended solids (SS)", and "sludge water content" were measured. Table 6 shows the results.

(Comparative Example 12)
In Example 16, in the same manner as in Example 16, except that water purification agent A5 made of polymer flocculant A (A-120, manufactured by MT Aquapolymer Co., Ltd.) was used instead of water purification agent A1. Purification treatment was performed, and "Cu concentration", "amount of suspended solids (SS)", and "sludge water content" were measured. Table 6 shows the results.

As described above, from the results of Examples 1 to 16, the water purification agent of the present invention has excellent water purification performance, can reduce the amount of inorganic flocculant used, and reduces the amount of sludge generated by reducing the sludge water content. It was confirmed that it could be done.

The water purification agent of the present invention has excellent water purification performance, can reduce the amount of inorganic flocculant used, and can reduce the amount of sludge generated by reducing the water content of sludge. can be suitably used for concentration of

Claims (12)

A water purifying agent comprising granules containing a mixture of Nagasaku jute powder and a polymer flocculant,
A water depurator, wherein the granules have a cumulative ₁₀ % volume particle diameter D10 of 100 µm or more and 400 µm or less, and a cumulative ₉₀ % volume particle diameter D90 of 800 µm or more and 1,200 µm or less. The water purification agent according to claim 1, wherein the mass composition ratio of the Nagasaku jute and the polymer flocculant is 9:1 to 1:9. 3. The water purification agent according to any one of claims 1 and 2, wherein the Changsaku jute has an appraisal number of Guokan Hemp 2013 "Chongjuu No. 4" by the Institute of Hemp, Chinese Academy of Agricultural Sciences. 3. The water purification agent according to any one of claims 1 and 2 , wherein the Changsaku jute has an appraisal number by the Institute of Hemp Research, Chinese Academy of Agricultural Sciences, and is ""Zhong Jute No. 3" of 皖品类军标号1209006. . 3. The water purification agent according to any one of claims 1 and 2 , wherein the Changsaku jute is "Central red hemp" with appraisal number 1209001 by the Hemp Research Institute of the Chinese Academy of Agricultural Sciences. 6. The water purification agent according to any one of claims 1 to 5, wherein said polymer flocculant is polyacrylamide. 7. The water purification agent according to claim 6, wherein said polyacrylamide has an acrylate or a carboxylate. A method for producing the water purification agent according to any one of claims 1 to 7,
A kneading step of mixing Nagasaku jute powder and a polymer flocculant, adding water and kneading to obtain a kneaded product;
A stretching and sheeting step of forming the kneaded product into a sheet by a stretching method to obtain a sheet-shaped molded product;
A drying step of drying the obtained sheet-like molding to obtain a dried sheet;
a pulverizing step of pulverizing the dried sheet;
A method for producing a water purification agent, comprising: Dissolving the water purification agent according to any one of claims 1 to 7 in water to obtain a dispersion of Nagasaku jute powder and a polymer flocculant, and providing the dispersion to waste water containing inorganic wastes. A water purification method characterized by removing inorganic wastes in waste water by 10. The water purification method according to claim 9, wherein the waste water contains inorganic wastes containing at least one of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, tin, and lead. At least one of inorganic ions selected from nickel ions, fluoride ions, iron ions, copper ions, zinc ions, chromium ions, arsenic ions, cadmium ions, tin ions, and lead ions in the inorganic unwanted matter is insolubilized. 11. The method for water purification according to claim 10, wherein the dispersion is subsequently subjected to the drainage. 12. The water purification method according to claim 11, wherein the amount of the inorganic flocculant used for the insolubilization treatment is 4,500 ppm or less.

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