WO2018051849A1

WO2018051849A1 - Water purification dispersion, production method for water purification dispersion, and waste water treatment method

Info

Publication number: WO2018051849A1
Application number: PCT/JP2017/031967
Authority: WO
Inventors: 雅彦伊東; 竜島田; 貴則藤田
Original assignee: デクセリアルズ株式会社
Priority date: 2016-09-15
Filing date: 2017-09-05
Publication date: 2018-03-22
Also published as: TWI756264B; TW201819516A

Abstract

A water purification dispersion that contains water and, in addition to the water, a total of 0.01-0.5 mass% of Corchorus olitorius powder and a polymer coagulant. The water purification dispersion is characterized by having a viscosity of 20-500 mPa⋅s. The water purification dispersion is also characterized in that the median diameter of the solids therein is 100-400 μm.

Description

Water purification dispersion, method for producing the water purification dispersion, and waste water treatment method

The present invention relates to a plant-derived water purification dispersion used for purification of water such as industrial wastewater, a method for producing the water purification dispersion, and a wastewater treatment method using the water purification dispersion.

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 has been generated.
On the other hand, regulations concerning the discharge of these inorganic ions are becoming stricter. In order to comply with this discharge regulation, there is a demand for a method for removing inorganic ions that can effectively remove inorganic ions from wastewater containing inorganic ions and that can be carried out as simply as possible at low cost.
Conventionally, as a method for removing impurity ions from factory wastewater or the like, an aggregation precipitation method, an ion exchange method, an adsorption method on an adsorbent such as activated carbon, an electric adsorption method, a magnetic adsorption method, and the like have been proposed.

For example, as a coagulation sedimentation method, a step of adding a base to wastewater in which heavy metal ions are dissolved, making the wastewater basic, insolubilizing at least part of the heavy metal ions to form a suspended solid, and an inorganic flocculant Contains a cation exchanger consisting of leafy vegetables such as Morohaya and Komatsuna. There has been proposed a method of performing an adsorption process of passing wastewater through an adsorbed layer (see, for example, Patent Document 1).
In addition, a coagulation method is proposed in which fine particles in a suspension are coagulated and separated by mixing or using a coagulant containing at least one of moroheiya, this dried product, or this extract and a polymer coagulant. (For example, refer to Patent Document 2).
Furthermore, a water purification agent comprising a granulated product containing a mixture of a plant powder and a polymer flocculant, and a water purification method using the water purification agent have been proposed (for example, see Patent Document 3).

By the way, when wastewater purification processing is performed stably at high speed, it is indispensable to introduce an automated purification device that can automatically perform wastewater purification treatment. In particular, in order to perform a large amount of wastewater treatment, an automated purification apparatus is an effective means. Therefore, in the use of the automated purification apparatus, it is desired to construct a purification process system that can stably purify a large amount of waste water at a high speed and exhibits superior purification performance.

JP 2011-194385 A JP-A-11-114313 Japanese Unexamined Patent Publication No. 2016-73898

In an automated purification device, when purifying wastewater using a plant-containing water purification agent as described in Patent Documents 1 to 3 above, in order to exert excellent water purification performance, water purification When the agent is used for drainage, a method may be considered in which a water purification agent is once dissolved in water to prepare a dispersion, and the dispersion is used for drainage. This is because it is preferable to use a dispersion and spread the water purification component throughout the drainage rather than directly injecting the solid water purification agent into the wastewater.
In addition, in order to purify wastewater in an efficient flow operation in accordance with the line production method, it is necessary to prepare a dispersion liquid. This is because the amount of wastewater discharged from factories and the like often changes from day to day, and it is required to prepare and store a predetermined amount of the dispersion in advance and use it as necessary when necessary.
Furthermore, considering customer needs, it can be considered that the water purifier is traded in a dispersion in water, and a certain demand is expected for the mode of the dispersion. Accordingly, there is a need to provide a dispersion that can be stored for a long time at low cost.
However, none of the above Patent Documents 1 to 3 provides a detailed description of the dispersion used for drainage. From the description of Patent Documents 1 to 3, a water purifier for use in drainage is used as water. It was not possible to produce a dispersion liquid that was excellent in water purification performance, did not deteriorate water purification performance even after long-term storage, and could satisfy low cost.

This invention makes it a subject to solve the said various problems and to achieve the following objectives. That is, an object of the present invention is to provide a dispersion for water purification that exhibits excellent water purification performance, does not deteriorate water purification performance even after long-term storage, and can satisfy low cost.

Means for solving the problems are as follows. That is,
<1> A water-purifying dispersion liquid containing water, and further containing 0.01% by mass to 0.5% by mass of a combination of powder of a long burlap and a polymer flocculant with respect to the water. The dispersion for water purification is characterized in that the viscosity is 20 mPa · S to 500 mPa · S, and the median diameter of the solid content in the dispersion for water purification is 100 μm to 400 μm.
<2> The water purifying dispersion liquid according to <1>, wherein the Nagatoro Hemp is “Central Hemp No. 4” having an appraisal number by National Institute of Agricultural Sciences of China.
<3> The water purifying dispersion liquid according to <1>, wherein the Nagatoro Hemp is “Chinese Hemp No. 3” having an appraisal number by the Chinese Institute of Agricultural Sciences of Agricultural Sciences No. 1900006. is there.
<4> The water purifying dispersion liquid according to <1>, wherein the Nagatoro Hemp is “Chinese red hemp” having an appraisal number by Chinese Academy of Agricultural Sciences hemp laboratory of 1900001. .
<5> The water purification dispersion according to any one of <1> to <4>, wherein the polymer flocculant is polyacrylamide.
<6> The water purifying dispersion liquid according to any one of <1> to <5>, wherein a mass composition ratio of the long straw burlap and the polymer flocculant is 9: 1 to 1: 9.
<7> The dispersion for water purification according to any one of <1> to <6>, wherein the viscosity is 150 mPa · S to 450 mPa · S.
<8> The water purification dispersion according to any one of <1> to <7>, wherein the median diameter is 150 μm to 350 μm.
<9> A method for producing a water purification dispersion for producing the water purification dispersion according to any one of <1> to <8>,
The kneaded burlap powder and the polymer flocculant are mixed and kneaded with water added to knead to obtain a kneaded product, the kneaded product is molded to form a molded product, and the molded product The water-purifying dispersion liquid is produced by dispersing a water purification agent powder produced by a production method including a drying step of obtaining a dried product and a pulverizing step of crushing the dried product in water. This is a method for producing a water-purifying dispersion.
<10> The method for producing a water purification dispersion according to <9>, wherein the electrical conductivity of water used for dispersion is 30 μS / cm or more.
<11> A wastewater treatment method characterized by removing inorganic unnecessary substances in the wastewater by subjecting the dispersion for water purification according to any one of <1> to <8> to wastewater. .
<12> The <11>, wherein the wastewater is wastewater containing an inorganic unnecessary material having at least one of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, tin, and lead. This is a wastewater treatment method.
<13> The waste water treatment method according to <12>, wherein the water purification dispersion is subjected to drainage after 24 hours or more after production.

According to the present invention, the conventional problems can be solved, the object can be achieved, excellent water purification performance is exhibited, water purification performance is not deteriorated even after long-term storage, and further low cost is satisfied. The obtained dispersion for water purification can be provided.

FIG. 1 is a diagram showing the appraisal number of “Chuju 3” used in the present invention. FIG. 2 is a diagram showing the appraisal number of “medium red hemp” used in the present invention.

(Dispersion for water purification)
The dispersion for water purification of the present invention contains a powder of long burlap and a polymer flocculant. In other words, the powder of long burlap and the polymer flocculant are dispersed in water.
The total content of the long burlap powder and the polymer flocculant in the water purification dispersion is 0.01% by mass to 0.5% by mass with respect to water as the dispersion medium.
The viscosity of the water purification dispersion is 20 mPa · S to 500 mPa · S.
The median diameter of the solid content in the water purification dispersion is 100 μm to 400 μm.
The dispersion for water purification of the present invention satisfying the above requirements is a dispersion for water purification that exhibits excellent water purification performance, does not deteriorate the water purification performance even after long-term storage, and can satisfy low cost.

The inventors of the present invention have conducted research on purification treatment of waste water using a dispersion, and when the plant powder and the polymer flocculant are dissolved depending on the type of water in the dispersion, the viscosity of the dispersion changes. I understood it. Further, it has been found that the viscosity of the dispersion tends to be lowered when Nagatoro burlap is used as the plant powder.
The inventors have found that the difference in viscosity of the dispersion affects the purification performance of the waste water, and that it is necessary to increase the viscosity of the dispersion to some extent in order to obtain good purification performance.
Moreover, when the viscosity is low, the solid content in the dispersion liquid tends to settle. For this reason, after a few days have passed since the dispersion was prepared, for example, components effective for water purification settle on the bottom of the container, and therefore remain in the container when injected into the drainage tank, resulting in sufficient water purification. The effect cannot be obtained. This phenomenon was particularly remarkable when tap water (containing various ions) or groundwater was used during preparation of the dispersion. When expensive distilled water is used as a dispersion medium, the problem of viscosity can be dealt with to some extent, but there is a problem that costs are increased.
In practice, the water purification dispersion used in the drainage tank has a scale of several tens to several hundreds of liters. Therefore, the water purification dispersion is stored in, for example, a drum having a capacity of about 200 L. In such a case, the above-described problem of solid content precipitation that occurs when the viscosity of the water purification dispersion is low becomes significant. However, when the water-purifying dispersion is prepared and immediately put into the drainage tank (for example, within a few minutes), the above-described solid content sedimentation is rarely a problem. However, the amount of wastewater generated often changes from day to day, and it is more practical to prepare and store a certain amount of the dispersion in advance and use the necessary amount when necessary. Therefore, there is a need for a water purification dispersion that can suppress sedimentation of solids even after long-term storage.
Therefore, as a result of intensive studies, the present inventors specify the content of the powder of the long burlap and the polymer flocculant in the dispersion, the median diameter of the solid content in the dispersion, and the viscosity of the dispersion. Thus, dispersions whose values are in the desired range can suppress sedimentation of solids even after long-term storage while maintaining a good purifying action on wastewater, and moreover, relatively inexpensive tap water and It has been found that even if groundwater is used, the water purification dispersion does not deteriorate the water purification performance.
Hereinafter, a specific configuration of the water purification dispersion will be described.

<Nagara Hemp Powder>
The long burlap burlap powder can be preferably used because it has a high cation exchange function and has pores capable of adsorbing micro flocs in waste water containing the inorganic ions.
As the part of the long burlap, any part of the leaf, stem or root can be used, but the part of the leaf can be preferably used.

In addition, among Changchun Hemp, Changchun Hemp produced in Changsha City, China, or the Chinese National Agricultural Science Institute's Measles Research Institute has the National Chin 2013 “Chinese Hemp 4”, and the Appraisal Number is Jiyakukan No. 1209006 “Central Hemp 3”, “Chu Hemp 1” with XPD005-2005, or “Chinese Hemp” with appraisal number 1209001 can be preferably used. Furthermore, the above-mentioned “middle burlap 4”, “middle burlap 3”, and “middle burlap” are more preferable, and “middle burlap 4” is particularly preferable.
In addition, the identification number of the above “middle burlap No. 3” is shown in FIG. The appraisal number of the “medium red linen” is shown in FIG.

The “middle burlap 4” has the following characteristics.
Agricultural products: jute

In order to obtain the plant powder, for example, a dried plant may be roughly pulverized and then finely pulverized to obtain a plant powder having a desired size (for example, a number average particle size of 400 μm or less).
Furthermore, in the present invention, the pulverized powder may be classified using a classifier such as a vibration sieve or an air ratio classifier. Thereby, it can adjust so that the median diameter of the solid content in the said dispersion liquid may become a desired range.

<Polymer flocculant>
The polymer flocculant is not particularly limited as long as it exhibits the effect of removing the inorganic unnecessary substances in the waste water, as in the case of the long burlap, for example, polyacrylamide (PAM), poly Examples thereof include a partially hydrolyzed acrylamide salt, sodium alginate, sodium polyacrylate, and CMC sodium salt. Among these, polyacrylamide can be preferably used. Examples of the polyacrylamide include commercially available Flopan AN 995SH, FA 920SH, FO 4490, AN 923, AN 956 (manufactured by SNF Corporation).

<Other additives>
The water purification dispersion may contain other additives such as preservatives, fillers, thickeners, colorants, thixotropic agents, and the like.

<Characteristics of water purification dispersion>
<< Content of Nagatan Hemp Powder and Polymer Flocculant >>
The combined content of the long burlap powder and the polymer flocculant is 0.01% by mass to 0.5% by mass, more preferably 0.05% by mass with respect to water as a dispersion medium. Is 0.3 mass%.
Also, the mixing ratio of the powder of the long burlap and the polymer flocculant is preferably 9: 1 to 1: 9 by mass ratio.

<< Viscosity of water purification dispersion >>
The viscosity of the water purification dispersion is 20 mPa · S to 500 mPa · S, more preferably 100 mPa · S to 450 mPa · S, and particularly preferably 150 mPa · S to 450 mPa · S.
If the viscosity is lower than 20 mPa · S, the solid content precipitates in the dispersion.
On the other hand, when it is higher than 500 mPa · S, the mixing condition with the waste water is hindered, and the water purification performance is not sufficiently exhibited.
The viscosity is a value at the temperature during storage, and is usually about 5 to 30 ° C. More preferably, it is about room temperature (around 23 ° C.).
The viscosity can be measured with a No. 1 rotor at room temperature of 23 ° C. using a TVC-7 type viscometer (B type viscometer) manufactured by Toki Sangyo.

<< Median diameter of solids in water purification dispersion >>
The median diameter of the solid content in the water purification dispersion is 100 μm to 400 μm, more preferably 150 μm to 350 μm.
When the median diameter of the solid content is smaller than 100 μm, the water purification function is insufficient. On the other hand, if it is larger than 400 μm, solids precipitate in the dispersion.
The solid matter in the dispersion is mainly affected by the insoluble content of the powder of Nagatoro burlap. Therefore, in order to make the median diameter within the desired range, the grinding conditions for the long burlap are adjusted, the powder for the long burlap obtained by pulverization is classified, or the classification conditions are adjusted. Or better. Alternatively, when preparing a granulated product containing a mixture of a long flax burlap powder and a polymer flocculant, the pulverization condition of the granulated product is adjusted or the granulated powder obtained by pulverization is adjusted. It is good to classify or adjust the classification conditions.
In the present invention, the solid median is obtained by performing both the steps of classifying the powder of the long burlap and the step of classifying the granulated powder composed of the powder of the long burlap and the polymer flocculant. It is preferable to adjust the diameter to be in a desired range.
Here, the median diameter (also referred to as d50) is the particle diameter plotted on 50% of the total number when the solid content is plotted in terms of the particle diameter (the larger side and the smaller side are equivalent). Particle diameter).
The median diameter of the solid content in the dispersion can be measured by diluting the dispersion sample 10 times and using a Morphologi G3 measuring instrument of Malvern (Spectris Co., Ltd.).

(Method for producing dispersion for water purification)
The method for producing a dispersion for water purification of the present invention (hereinafter also referred to as the production method of the present invention) comprises a powder of a long burlap, a polymer flocculant, A dispersion step of dispersing the water in water.
In this case, as long as the obtained water purification dispersion satisfies the above-mentioned <characteristics of the water purification dispersion>, there is no particular limitation on the dispersion method of the long flax burlap powder and the polymer flocculant, For example, the water-purifying dispersion liquid can be obtained by separately dispersing the powder of long burlap and the polymer flocculant in water. However, in this case, in order to obtain a desired viscosity, it may be necessary to use distilled water as the dispersion medium. Therefore, the present invention is not limited to the type of the dispersion medium (water), and the following embodiment is more preferable for obtaining the water purification dispersion of the present invention.
In other words, instead of separately dispersing the long-orange burlap powder and the polymer flocculant in water, once making a water purifier containing the long-orange burlap powder and the polymer flocculant, the water purification It is more preferable to disperse the agent powder in water to obtain a water purification dispersion.
The water purification agent is preferably a water purification agent comprising a granulated product obtained by kneading a long flax burlap powder and a polymer flocculant. For example, the water purifying agent is a kneading step of mixing the powder of the long burlap and the polymer flocculant and adding water to knead to obtain a kneaded product, and molding the kneaded product to form a molded body It can be obtained by a production method including a molding step, a drying step of drying the molded body to obtain a dried product, and a pulverizing step of pulverizing the dried product.
Furthermore, it is preferable to include a classification step of classifying the granulated product with a sieve after the pulverization step.

In the molding step, for example, the kneaded product is molded by an arbitrary molding method to form a molded body.
In the drying step, the obtained molded body may be dried at a temperature of 80 ° C. to 150 ° C. for 2 hours to 12 hours using, for example, a multistage hot air dryer.
The molded body is dried, and may be subjected to a pulverization step when the moisture content of the molded body reaches, for example, about 30%.
The drying step is preferably applied in the procedure of drying the molded body obtained in the molding step and then pulverizing the dried molded body. For example, the drying step is obtained in the molding step. The molded body may be pulverized and then subjected to a drying step to obtain a granulated product.
In the pulverization step, pulverization may be performed using a pulverizer, for example, an airflow ultrafine pulverizer.
In the classification step, the pulverized powder is classified using a classifier, such as a vibration sieve or an air ratio classifier, so that the median diameter of the solid content in the water purification dispersion is in a desired range. Adjust it.
As described above, the water purification dispersion obtained by once producing a water purification agent and dispersing the water purification agent powder in water is not particularly limited as a dispersion medium (water). In addition to (distilled water), water having an electric conductivity of 30 μS / cm or more can be used. Even when these dispersion media are used, a desired viscosity can be obtained. Thereby, comparatively cheap tap water and groundwater can be used.
Even if tap water or groundwater is used for the dispersion, the concentration of inorganic ions in the wastewater can be reduced to a desired concentration or less, and high water purification performance can be exhibited. Moreover, sedimentation of the solid content in the dispersion can be suppressed even after long-term storage.

(Wastewater treatment method)
The wastewater treatment method of the present invention is to remove inorganic unnecessary substances in the wastewater by using the above-described water purification dispersion of the present invention for wastewater.
Examples of the inorganic unnecessary materials include inorganic unnecessary materials having at least one of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, and lead.
By using the dispersion for water purification of the present invention, since sedimentation of solids in the dispersion for water purification can be suppressed even after long-term storage, excellent water purification performance can be exhibited even after long-term storage. Therefore, it is not necessary to use the water purification dispersion immediately after the production, and even if it is used after 24 hours, excellent water purification performance can be exhibited.

The waste water treatment method of the present invention will be specifically described.
For example, a dispersion for water purification obtained by the production method of the present invention after an insolubilization step in which a base is added to the wastewater to make the wastewater basic, insolubilize at least part of the heavy metal ions to form a suspended solid. Liquid can be added.
By providing the water purification dispersion at a ratio of 0.5 ppm to 15 ppm with respect to the wastewater, the inorganic waste is coagulated and settled, and the sediment separated and settled is removed to purify the wastewater.

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

(Example 1)
As waste water used for experiments, nickel sulfate hexahydrate was dissolved in pure water to produce 800 g of an aqueous solution containing 50 mg / L of nickel ions (virtual waste water).
Next, caustic soda was supplied to the waste water so as to have a pH of 10, and stirred to insolubilize the nickel. The nickel ion concentration of the supernatant of the waste water was 2 mg / L.
<Water purification agent>
Next, Nagaso Huang (Guangzhou, China) was used as a plant, and polyacrylamide (PAM) was used as a polymer flocculant.
Plants are dried by sun drying until the moisture content is 5% by mass or less, then pulverized by an atomizer (Hammer Mill, manufactured by Masuko Sangyo Co., Ltd.), and only those whose particle diameter falls within the range of 100 μm to 400 μm are used Thus, those less than 100 μm and larger than 400 μm were sieved and removed (cut).
The granulated product 1 was obtained by the production method shown below, and the granulated product 1 was used as the water purifier 1.

<< Method for producing water purification agent >>
A kneaded product (plant powder + polymer flocculant + water = 30 kg) obtained by adding 5 times the mass of water to the solid content of the plant powder and the polymer flocculant was added to a planetary mixer ( A mixer manufactured by Aikosha Seisakusho Co., Ltd., mixing machine ACM-110, capacity 110 L), and kneading was performed under the conditions of mixing at a rotational speed of 150 rpm for 20 minutes.
The obtained kneaded product was molded to produce a molded body.
This molded body was dried at 120 ° C. for 3 hours and further at 150 ° C. for 2 hours using a multistage hot air dryer (manufactured by Nanyo Seisakusho, rack type oven device).
Next, the dried molded body was pulverized using an airflow type ultrafine pulverizer (Selenium mirror manufactured by Masuko Sangyo Co., Ltd.) so that the median diameter was 400 μm.
The median diameter was measured with Mastersizer 2000 (Malvern Instruments).
The pulverized powder was screened using a classifier (vibrating sieve machine manufactured by Tsukasa Industries Co., Ltd.), so that only particles having a particle diameter falling within the range of 150 μm to 850 μm were used by sieving them (cut). did).
Thus, the granulated material 1 was obtained and it was set as the water purification agent 1.

<Dispersion>
To this water purifying agent 1, water having an electric conductivity of 110 μS / cm ³ (tap water in Kanuma City, Tochigi Prefecture) was added to a solid content of 0.1% by mass and stirred to obtain dispersion 1.
By the method described above, the viscosity of the dispersion 1 and the median diameter of the solid content in the dispersion were measured.

<Characteristic evaluation>
The dispersion liquid 1, 200 L capacity open type drum can was filled with 180 L.
After leaving for a predetermined time in a dark place at 23 ° C., the lid of the drum can was removed, and the presence or absence of sedimentation was confirmed visually.
Next, the dispersion 1 containing the water purifier 1 was added to the waste water so as to have a solid content of 7 mg / L and stirred. Here, the measuring method of "solid content" can be calculated | required by measuring the slurry density | concentration in waste_water | drain with a moisture meter, and calculating backward.
The waste water to which the dispersion 1 was added was transferred to a sedimentation tank, and then allowed to stand, and the state was visually confirmed every hour.
The time when it was confirmed that the supernatant liquid and the precipitate were separated into two layers was measured as the sedimentation time.
Further, the supernatant was collected, and the ion concentration was measured with lambda (Λ) 9000 (manufactured by Kyoritsu Riken).
As a result, water purification performance was evaluated according to the following criteria.
[Evaluation criteria for water purification performance]
: Less than 1.0 mg / L (below detection limit)
○: 1.0 mg / L or more and less than 1.4 mg / L ○ Δ: 1.4 mg / L or more and less than 1.7 mg / L Δ: 1.7 mg / L or more and less than 2.0 mg / L ×: 2.0 mg / L The evaluation results of Example 1 are shown in Table 1-1.
In Table 1-1, plant powder 1 represents Nagatoro Hemp (Guangzhou, China), and PAM represents polyacrylamide (the same applies to Tables 1-2 to 1-5).

(Example 2)
In Example 1, the same as in Example 1 except that the appraisal number by Nagase Institute of Agricultural Sciences of Agricultural Sciences of Agricultural Sciences of Nagatoro, No. 190006, “Chuju 3” was used as the plant. Water purification agent 2 was produced.
Using the dispersion 2 in which the water purification agent 2 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 2 are shown in Table 1-1. In Table 1-1, the plant powder 2 represents “Central Burlap 3”.

(Example 3)
In Example 2, Appraisal Number 2013, “Chu Hemp No. 4” by Nagase Agricultural Institute of Agricultural Sciences of Nagatoro Hemp was used as the plant. Other than that was carried out similarly to Example 2, and produced the water purification agent 3. FIG.
Using the dispersion 3 in which the water purification agent 3 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 3 are shown in Table 1-1. In Table 1-1, the plant powder 3 represents “Central Burlap 4”.

Example 4
In Example 3, as the plant, the appraisal number by Nagasaki Hemp hemp laboratory of Chinese Academy of Agricultural Sciences was used as the plant, and the special product registered letter No. 1900001, “Chinese red hemp” was used. Other than that was carried out similarly to Example 3, and produced the water purification agent 4. FIG.
Using the dispersion 4 in which the water purification agent 4 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 4 are shown in Table 1-1. In Table 1-1, the plant powder 4 represents “medium red hemp”.

(Comparative Example 1)
Comparative water purifier 1 was prepared in the same manner as in Example 3, except that the dispersion concentration was 0.005% by mass and the viscosity was adjusted to 15 mPa · S.
Using the comparative dispersion 1 in which the comparative water purification agent 1 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Comparative Example 1 are shown in Table 1-2.
The sedimentation result “Yes” in the drum can of Comparative Example 1 was a state where the bottom of the drum can not be seen due to the sediment.

(Example 5)
In Example 3, a water purifying agent 5 was produced in the same manner as in Example 3 except that the dispersion concentration was 0.02% by mass and the viscosity was adjusted to 20 mPa · S.
Using the dispersion 5 in which the water purification agent 5 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 5 are shown in Table 1-2.
The result of sedimentation in the drum of Example 5 was “slightly present”, but sediment was observed, but the bottom of the drum was visible.

(Example 6)
In Example 3, a water purifying agent 6 was produced in the same manner as in Example 3 except that the dispersion concentration was 0.5 mass% and the viscosity was adjusted to 500 mPa · S.
Using the dispersion 6 in which the water purification agent 6 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 6 are shown in Table 1-2.

(Comparative Example 2)
Comparative water purifier 2 was produced in the same manner as in Example 3, except that the dispersion concentration was 0.6% by mass and the viscosity was adjusted to 600 mPa · S in Example 3.
Using the comparative dispersion 2 in which the comparative water purification agent 2 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Comparative Example 2 are shown in Table 1-2.

(Example 7)
In Example 3, water purification agent 7 was produced in the same manner as in Example 3 except that the dispersion concentration was 0.08% by mass and the viscosity was adjusted to 150 mPa · S.
Using the dispersion liquid 7 in which the water purification agent 7 was dispersed in water, the characteristics of the water purification dispersion liquid were evaluated in the same manner as in Example 1. The evaluation results of Example 7 are shown in Table 1-2.

(Example 8)
A water purifier 8 was produced in the same manner as in Example 3, except that the dispersion concentration was 0.4 mass% and the viscosity was adjusted to 450 mPa · S in Example 3.
Using the dispersion 8 in which the water purification agent 8 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 8 are shown in Table 1-2.

(Comparative Example 3)
In Example 3, after crushing the dried plant material, the median diameter of the solid content in the dispersion was adjusted to 80 μm by changing the conditions of sieving at the time of classification. The comparative water purification agent 3 was produced in the same manner as described above.
Using the comparative dispersion liquid 3 in which the comparative water purification agent 3 was dispersed in water, the characteristics of the water purification dispersion liquid were evaluated in the same manner as in Example 1. The evaluation results of Comparative Example 3 are shown in Table 1-3.

Example 9
In Example 3, after crushing the dried plant material, the median diameter of the solid content in the dispersion was adjusted to 120 μm by changing the sieving conditions at the time of classification. Example 3 In the same manner as described above, a water purifying agent 9 was produced.
Using the dispersion 9 in which the water purification agent 9 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 9 are shown in Table 1-3.

(Comparative Example 4)
In Example 3, the comparative water purifier 4 was produced in the same manner as in Example 3 except that the dried plant material was pulverized and then not classified.
Using the comparative dispersion 4 in which the comparative water purification agent 4 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Comparative Example 4 are shown in Table 1-3.

(Reference Example 1)
Using the comparative water purification agent 4 prepared in Comparative Example 4, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. However, in Reference Example 1, the standing time in the drum can was 1 day (24 hours). The evaluation results of Reference Example 1 are shown in Table 1-3.

(Example 10)
In Example 3, after crushing the dried plant material, the median diameter of the solid content in the dispersion was adjusted to 150 μm by changing the sieving conditions at the time of classification. The water purification agent 10 was produced in the same manner as described above.
Using the dispersion 10 in which the water purification agent 10 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 10 are shown in Table 1-3.

(Example 11)
In Example 3, after crushing the dried plant material, the median diameter of the solid content in the dispersion was adjusted to 350 μm by changing the sieving conditions at the time of classification. In the same manner, a water purifying agent 11 was produced.
Using the dispersion 11 in which the water purification agent 11 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 11 are shown in Table 1-3.

(Example 12)
A dispersion 12 was prepared in the same manner as in Example 3 except that the water in the dispersion was changed to water having an electrical conductivity of 198 μS / cm (tap water in Kanuma City, Tochigi Prefecture).
Using the dispersion 12, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 12 are shown in Table 1-4.

(Example 13)
In Example 3, the dispersion water was dispersed in the same manner as in Example 3 except that the water was obtained by blending an appropriate amount of tap water and distilled water in Kanuma City, Tochigi Prefecture, and having water conductivity of 30 μS / cm. Liquid 13 was produced.
Using the dispersion 13, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 13 are shown in Table 1-4.

(Example 14)
In Example 3, the plant and the polymer flocculant kneaded product were not classified. Other than that was carried out similarly to Example 3, and produced the water purification agent 14. FIG.
Using the dispersion 14 in which the water purification agent 14 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 14 are shown in Table 1-4.

(Example 15)
In Example 3, polyamine was used instead of polyacrylamide. Other than that was carried out similarly to Example 3, and produced the water purification agent 15. FIG.
Using the dispersion 15 in which the water purification agent 15 was dispersed in water, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 15 are shown in Table 1-4.

(Example 16)
A dispersion 16 was prepared in the same manner as in Example 3 except that the water in the dispersion was changed to water (distilled water) having an electric conductivity of 1 μS / cm in Example 3.
Using the dispersion 16, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 16 are shown in Table 1-4.

(Example 17)
In Example 3, a granulated product was not prepared, and the polymer flocculant and the plant powder were each used alone, and each was dispersed in water. Moreover, distilled water was used as the water of the dispersion. Otherwise, a dispersion 17 was produced in the same manner as in Example 3.
Using the dispersion 17, the characteristics of the water purification dispersion were evaluated in the same manner as in Example 1. The evaluation results of Example 17 are shown in Table 1-4.

(Example 18)
As waste water used for experiments, potassium fluoride was dissolved in pure water to produce 800 g of an aqueous solution containing 2,500 mg / L of fluorine ions (virtual waste water).
Next, 8.6 mg / L of calcium chloride was added to the waste water, and the mixture was stirred while adding sodium hydroxide so that the pH was 7.5 to 9.0, thereby insolubilizing fluorine. By this operation, the aqueous fluorine solution was separated into a supernatant and a precipitate containing micro floc.
At this point, the ionic concentration of the supernatant of the wastewater was 10 mg / L.
Except having used the said waste_water | drain, it carried out similarly to Example 3, and evaluated the characteristic of the dispersion liquid for water purification | cleaning using the dispersion liquid 3 which disperse | distributed the water purification agent 3 in water. The evaluation results of Example 18 are shown in Table 1-5.

(Example 19)
As waste water used for the experiment, ferric chloride hexahydrate was dissolved in pure water to prepare 800 g of an aqueous solution containing 200 mg / L of iron ions (virtual waste water).
Next, iron was insolubilized by stirring the waste water while adding sodium hydroxide so that the pH was 6.5 to 9.0.
At this time, the ion concentration of the supernatant of the wastewater was 2 mg / L.
Except having used the said waste_water | drain, it carried out similarly to Example 3, and evaluated the characteristic of the dispersion liquid for water purification | cleaning using the dispersion liquid 3 which disperse | distributed the water purification agent 3 in water. The evaluation results of Example 19 are shown in Table 1-5.

(Example 20)
As waste water used for experiments, copper sulfate pentahydrate was dissolved in pure water to produce 800 g of an aqueous solution containing 100 mg / L of copper ions (virtual waste water).
Next, the waste water was stirred while adding sodium hydroxide so that the pH was 7.0 to 8.0 to insolubilize copper.
At this time, the ion concentration of the supernatant of the wastewater was 2 mg / L.
Except having used the said waste_water | drain, it carried out similarly to Example 3, and evaluated the characteristic of the dispersion liquid for water purification | cleaning using the dispersion liquid 3 which disperse | distributed the water purification agent 3 in water. The evaluation results of Example 20 are shown in Table 1-5.

(Example 21)
As waste water used for experiments, zinc nitrate hexahydrate was dissolved in pure water to produce 800 g of an aqueous solution containing 100 mg / L of zinc ions (virtual waste water).
Next, the pH of the waste water is. The mixture was stirred while adding sodium hydroxide so as to be 9.0 to 9.5 to insolubilize zinc.
At this time, the ionic concentration of the supernatant of the waste water was 5 mg / L.
Except having used the said waste_water | drain, it carried out similarly to Example 3, and evaluated the characteristic of the dispersion liquid for water purification | cleaning using the dispersion liquid 3 which disperse | distributed the water purification agent 3 in water. The evaluation results of Example 21 are shown in Table 1-5.

(Example 22)
As waste water used for experiments, potassium dichromate was dissolved in pure water to produce 800 g of an aqueous solution containing 100 mg / L of chromium ions (virtual waste water).
Next, chromium was insolubilized by stirring the waste water while adding sodium hydroxide so that the pH was 6.0 to 7.5.
At this time, the ionic concentration of the supernatant of the waste water was 5 mg / L.
Except having used the said waste_water | drain, it carried out similarly to Example 3, and evaluated the characteristic of the dispersion liquid for water purification | cleaning using the dispersion liquid 3 which disperse | distributed the water purification agent 3 in water. The evaluation results of Example 22 are shown in Table 1-5.

(Example 23)
As waste water used for experiments, diarsenic trioxide was dissolved in pure water to prepare 800 g of an aqueous solution containing 10 mg / L arsenic ions (virtual waste water).
Next, 65 mg / L of ferric chloride and 354 mg / L of calcium chloride are added to the waste water, and then stirred while adding sodium hydroxide so that the pH is 8.0 to 9.5. Arsenic was insolubilized.
At this time, the ionic concentration of the supernatant of the wastewater was 0.05 mg / L.
Except having used the said waste_water | drain, it carried out similarly to Example 3, and evaluated the characteristic of the dispersion liquid for water purification | cleaning using the dispersion liquid 3 which disperse | distributed the water purification agent 3 in water. The evaluation results of Example 23 are shown in Table 1-5.
However, in Example 23, the sedimentation time was measured in the same manner as in Example 3, and then the supernatant was collected and concentrated by an evaporator so that the volume became 1/100, and then the ion concentration was measured. Regarding arsenic ions, an ion concentration of 0.01 mg / L or less was judged to be a preferable result, and evaluated as ◎.

As described above, from the results of Examples 1 to 23, the water purification dispersion of the present invention exhibits excellent water purification performance, does not deteriorate water purification performance even after long-term storage, and can satisfy low cost. It was confirmed that this was a dispersion for purification.

Claims

A water-purifying dispersion liquid containing water and further containing 0.01% by mass to 0.5% by mass of a long flax powder and a polymer flocculant with respect to the water. A dispersion for water purification, wherein the dispersion has a median diameter of 20 mPa · S to 500 mPa · S and a solid content in the dispersion for water purification is 100 μm to 400 μm.
2. The dispersion for water purification according to claim 1, wherein said Nagatoro Hemp is “Central Hemp No. 4” with the appraisal number by National Institute of Agricultural Sciences, National Institute of Agricultural Sciences 2013.
2. The water purification dispersion according to claim 1, wherein said Nagatoro Hemp is “Chinese Hemp 3” with an appraisal number by the Chinese Academy of Agricultural Sciences hemp laboratory of 1980006.
2. The water purification dispersion according to claim 1, wherein said Nagatoro Hemp is “Chinese red hemp” having an appraisal number by the Chinese Academy of Agricultural Sciences hemp laboratory of 1950001.
The water purification dispersion according to any one of claims 1 to 4, wherein the polymer flocculant is polyacrylamide.
The water purification dispersion according to any one of claims 1 to 5, wherein a mass composition ratio of the long-orange burlap and the polymer flocculant is 9: 1 to 1: 9.
A method for producing a water purification dispersion for producing the water purification dispersion according to claim 1,
The kneaded burlap powder and the polymer flocculant are mixed and kneaded with water added to knead to obtain a kneaded product, the kneaded product is molded to form a molded product, and the molded product The water-purifying dispersion liquid is produced by dispersing a water purification agent powder produced by a production method including a drying step of obtaining a dried product and a pulverizing step of crushing the dried product in water. A method for producing a water-purifying dispersion.
The method for producing a water purification dispersion according to claim 7, wherein the electrical conductivity of water used for dispersion is 30 µS / cm or more.
A wastewater treatment method characterized by removing inorganic unnecessary substances in the wastewater by subjecting the water purification dispersion according to any one of claims 1 to 6 to wastewater.
The wastewater treatment method according to claim 9, wherein the wastewater is wastewater containing an inorganic unnecessary material having at least one of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, tin, and lead. .
The wastewater treatment method according to claim 10, wherein the water purification dispersion is used for drainage after 24 hours or longer after production.