TW201819516A - Dispersion liquid for water purification, method for producing the dispersion liquid for water purification, and method for treating wastewater - Google Patents

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 [mu]m.

Description

Water purification dispersion, method for producing the water purification dispersion, and method for treating discharged water

The present invention relates to a plant-derived water purification dispersion used for water purification of industrial waste water and the like, a method for manufacturing the water purification dispersion, and a method for treating discharged water 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 harmful substances such as metal ions or inorganic ions has been produced. On the other hand, regulations regarding the emission of these inorganic ions have gradually become stricter. In order to comply with such discharge regulations, the present inventors sought a method for removing inorganic ions that can efficiently remove inorganic ions from the discharged water containing the inorganic ions, and implement it as simply and cost-effectively as possible. Concerning methods for removing impurities such as water discharged from factories, agglutination precipitation methods, ion exchange methods, adsorption methods using adsorbents such as activated carbon, electro-adsorption methods, and magnetic adsorption methods have been proposed.

For example, in the case of the agglutination precipitation method, a method has been proposed, which comprises adding alkali to the discharged water in which heavy metal ions are dissolved and making the discharged water alkaline, and then insolating at least a part of the heavy metal ions. A step of forming a suspended solid; a step of adding an inorganic agglutinating agent to the discharged water to coagulate and settle the suspended solid; and passing the discharged water through a leafy vegetable containing jute (mulukhiya) and komatsuna An adsorption step of an adsorption layer of a cation exchanger (for example, refer to Patent Document 1). At the same time, there has also been proposed an agglutination method in which a coagulant containing at least one of molokheiya, or a dried product, or an extract thereof is mixed with or used in combination with a polymer coagulant, thereby making the suspension Mesoparticles are aggregated and separated (for example, refer to Patent Document 2). Furthermore, a water purification agent and a water purification method using the water purification agent have also been proposed, which use a water purification agent made of particles containing a mixture of a plant powder and a polymer agglutinating agent (for example, refer to Patent Document 3). ).

However, in order to perform stable treatment of the discharged water at a high speed, it is necessary to introduce an automatic purification device capable of automatically performing the purification treatment of the discharged water. In particular, when a large amount of discharged water is treated, an automatic purification device becomes an effective means. Therefore, a system structure for purification treatment is desired, which can be applied to an automatic purification device, can perform a large amount of discharged water in a stable purification treatment at a high speed, and exhibits more excellent purification performance.

[Prior Art Literature] [Patent Literature] [Patent Literature 1] Japanese Patent Laid-Open No. 2011-194385 [Patent Literature 2] Japanese Patent Laid-Open No. 11-114313 [Patent Literature 3] Japanese Patent Laid-Open No. 2016-73898

[Problems to be Solved by the Invention] In an automatic purification device, when using a water purification agent containing the plants described in the aforementioned Patent Documents 1 to 3 to purify the discharged water, in order to exert excellent water purification performance, consider The following method is provided: When the water purification agent is supplied to the discharged water, the water purification agent needs to be dissolved in water to prepare a dispersion, and then the dispersion is supplied to the discharged water. Since the solid water purification agent is directly poured into the drain water and a dispersion liquid is used, the water purification component is conducted to the entire drain liquid, so it is preferable. In addition, according to the production method of the production line, if the discharge water purification treatment in the flow operation is to be performed efficiently, a dispersion liquid must be prepared. Since the amount of discharged water discharged from factories and the like changes day by day, it is sought to prepare a certain amount of dispersion liquid in advance and store it, and use a specific amount if necessary. Furthermore, if the needs of customers are further considered, the case of trading with a dispersion solution in which a water-purifying agent is dissolved is considered, so it is expected that there will be a certain demand for the state of the dispersion solution. Therefore, it is sought to provide a low-cost dispersion liquid that can be stored for a long period of time. However, none of the above Patent Documents 1 to 3 describes the dispersion liquid supplied to the discharged water in detail. From the descriptions of the above Patent Documents 1 to 3, these patent documents disclose a dispersion liquid that is dispersed in water. Water purification agents are used to supply water to discharge water, but these patent documents do not disclose that the dispersions show excellent water purification performance, and the water purification performance does not decrease after long-term storage, and can be produced even at low cost Satisfactory dispersion.

The present invention solves each of the problems described above, and has as its object to achieve the following objects. That is, the object of the present invention is to provide a dispersion for water purification, which can exhibit excellent water purification performance, and the water purification performance does not decrease after long-term storage, and can be satisfactorily applied even at low cost. Production.

[Means for Solving the Problem] The means for solving the problem are as follows. That is, <1> A dispersion for water purification, characterized in that it contains water, and the total content of Changshuo jute powder and polymer coagulant is 0.01 mass% to 0.5 mass% relative to the aforementioned water. The viscosity of the dispersion for water purification is 20 mPa · S to 500 mPa · S, and the median diameter of the solid component in the dispersion for water purification is 100 μm to 400 μm. <2> The dispersion liquid for water purification according to the above <1>, wherein the identification number of the aforementioned Changshu Jute Department of the Institute of Hemp Research of the Chinese Academy of Agricultural Sciences is "China Jute 4" of Guojian Ma 2013. <3> The dispersion liquid for water purification according to the above <1>, wherein the identification number of the aforementioned Changshu jute is the Institute of Hemp Research of the Chinese Academy of Agricultural Sciences, "Zhong Jute No. 3 of Wanpinjian Dengzi 1209006" ". <4> The dispersion liquid for water purification according to the above <1>, wherein the identification number of Changshuo Jute Department of the Institute of Hemp Research of the Chinese Academy of Agricultural Sciences is "Chinese Red Hemp" of Wanpinjian Dengzi No. 1209001. <5> The dispersion liquid for water purification as described in any one of <1> to <4>, wherein the polymer coagulant is polypropylene amidamine. <6> The dispersion liquid for water purification according to any one of <1> to <5>, wherein the mass composition ratio of the Changshuo jute powder and the polymer coagulant is 9: 1 to 1: 9 . <7> The dispersion liquid for water purification as described in any one of <1> to <6>, wherein the viscosity is 150 mPa · S to 450 mPa · S. <8> The dispersion liquid for water purification 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-purifying dispersion, which manufactures the water-purifying dispersion according to any one of the above-mentioned <1> to <8>, characterized in that the kneading step is performed to change the aforementioned Changshuo Huang Hemp powder is mixed with the aforementioned polymer coagulant and added with water to knead to obtain a kneaded product; a forming step of forming the kneaded product to form a formed body; a drying step of drying the formed body to obtain a dried object; The dry matter is pulverized; the powder of the water-purifying agent produced by the production method including the steps is dispersed in water, and the water-purifying dispersion is produced. <10> The manufacturing method of the water-purifying dispersion liquid as described in said <9> whose electrical conductivity of the water for dispersion is 30 microsiemens / cm or more. <11> A method for treating discharged water by supplying the water-purifying dispersion described in any one of <1> to <8> to the discharged water to remove the inorganic waste in the discharged water. <12> The method for treating discharged water according to the above <11>, wherein the discharged water is at least one selected from the group consisting of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, tin, and lead. An inorganic waste. <13> The method for treating discharged water according to the above <12>, wherein the dispersion liquid for water purification is supplied to the discharged water after 24 hours or more of manufacturing.

[Effects of the Invention] According to the present invention, a plurality of problems in the past can be solved and the foregoing objects can be achieved, and a water purification dispersion liquid can be provided which exhibits excellent water purification performance and has a water purification performance after long-term storage. It does not fall, and can be produced satisfactorily even at low cost.

(Water Purification Dispersion Liquid) The water purification dispersion liquid of the present invention contains Changshuo jute powder and a polymer coagulant. In other words, Changshuo jute powder and polymer coagulant are dispersed in water. In the water-purifying dispersion liquid, the total content of Changshuo jute powder and the polymer agglutinating agent is 0.01 mass% to 0.5 mass% with respect to water as a dispersion medium. The viscosity of the dispersion for water purification is 20 mPa · S to 500 mPa · S. The median diameter of the solid component in the water-purifying dispersion is 100 μm to 400 μm. The water-purifying dispersion of the present invention which satisfies the above-mentioned requirements exhibits excellent water-purifying performance, does not decrease in water-purifying performance after long-term storage, and can be satisfactorily produced even at low cost.

The present inventors conducted repeated researches on the purification treatment of the discharged water using the dispersion liquid, and found that, according to the type of water in the dispersion liquid, the viscosity of the dispersion liquid changed when the plant powder and the polymer coagulant were dissolved. When Changshuo jute is used as a plant powder, the viscosity of the dispersion tends to decrease. Then, the present inventors obtained the following insight: the difference in the viscosity of the dispersion liquid will affect the purification performance of the discharged water, and in order to obtain a good purification performance, it is effective to increase the viscosity of the dispersion liquid to some extent. If the viscosity is too low, the solid content in the dispersion liquid tends to settle. Therefore, if a dispersion liquid is produced, for example, after several days, since the effective ingredients for water purification are deposited on the bottom of the container, the dispersion liquid remains in the container when it is injected into the drainage tank, and as a result, a sufficient water purification effect cannot be obtained. This phenomenon is particularly noticeable when a dispersion liquid is prepared using tap water (containing various ions) and groundwater. When expensive distilled water is used as a dispersion medium, although the problem of viscosity can be dealt with to some extent, a problem of cost arises. Practically, the coefficient of the dispersion liquid for water purification supplied to the drainage tank is in the range of ten to several hundred L. Therefore, the water-purifying dispersion liquid is stored in, for example, a drum having a capacity of about 200 L. In this way, the above-mentioned problem of sedimentation of the solid components that occurs when the viscosity of the dispersion for water purification is too low becomes significant. However, when the dispersion liquid for water purification is prepared, and it is directly (for example, within a few minutes) put into a drain tank, the problem of the above-mentioned solid content sedimentation is reduced. However, since the amount of generated water discharged from factories and the like varies from day to day, practically, it is sought to prepare a certain amount of dispersion liquid in advance and store it, and use a specific amount if necessary. Therefore, there is a need for a water-purifying dispersion liquid capable of suppressing the sedimentation of solid components even after long-term storage. Therefore, as a result of intensive research by the present inventors, by defining the contents of the jute powder and polymer coagulant in the dispersion, the median diameter of the solid components in the dispersion, and the viscosity of the dispersion, it was found that the above values were in Dispersions in the desired range can maintain good purification of the discharged water, and can suppress the sedimentation of solids even after long-term storage, and can produce water purification performance even when cheaper tap water and groundwater are used. Non-falling water purification dispersion. Hereinafter, a specific configuration of the water-purifying dispersion liquid will be described.

<Changshuo Jute Powder> The changshuo jute powder has high cation exchange performance and has pores capable of adsorbing micro-flocks in the discharged water containing the aforementioned inorganic ions, so it is preferably used. . Regarding the site of Changshu jute, although any site such as leaves, stems, or roots can also be used, it is preferred to use a site of leaves.

Also, among Changshu jute, it is preferable to use Changshu jute produced in Changsha, China, or the identification number of "Jute 4" and the identification number of Guojian Hemp 2013 of the Chinese Academy of Agricultural Sciences. It is "Zhong Jute No. 3" of Wan Pinjian No. 1209006, "Zhong Jute No. 1" of identification No. XPD005-2005, or the No. of Wan Pinjian No. 1 of Chinese Academy of Agricultural Sciences 1209001 "Chinese Red Hemp". Furthermore, more preferred are the aforementioned "Medium Jute No. 4", "Medium Jute No. 3" and "Medium Red Hemp", and particularly preferred are the aforementioned "Medium Jute No. 4". Moreover, the identification number of the said "medium jute 3" is shown in FIG. The identification number of the aforementioned "medium kenaf" is shown in FIG. 2.

The aforementioned "Jute No. 4" has the following characteristics: Crop type: Jute.

In order to obtain the aforementioned plant powder, for example, it is preferable to obtain a plant powder of a desired size (for example, a number average particle diameter of 400 μm or less) by first coarsely pulverizing a dried plant and then finely pulverizing. Next, in the present invention, it is preferable to classify the pulverized powder using, for example, a vibrating screener or a wind ratio classifier so that the median diameter of the particles is within a desired range. Thereby, the median diameter of the solid content in the dispersion liquid can be adjusted within a desired range.

<Polymer agglutinating agent> The polymer agglutinating agent is the same as the above-mentioned Changshuo Jute, and is not particularly limited as long as it is a polymer agglutinating agent having the effect of removing the aforementioned inorganic waste in the discharged water. For example, polyacrylamide (PAM), partially hydrolyzed salt of polyacrylamide, sodium alginate, sodium polyacrylate, sodium salt of carboxymethyl cellulose (CMC, Carboxymethyl Cellulose), etc. Among these, polyacrylamide is preferably used. As the polypropylene amidamine, commercially available products such as Flopan AN 995SH, FA 920SH, FO 4490, AN 923, AN 956 (manufactured by SNF Co., Ltd.) and the like can be used.

<< Other additives >> As other additives, additives such as preservatives, fillers, thickeners, colorants, and thixotropic agents may be contained in the water-purifying dispersion liquid.

<Characteristics of Water Purification Dispersion Liquid> << Contents of Changshuo Jute Powder and Polymer Agglutinating Agent >> The total content of the Changshuo Jute Powder and Polymer Aggregating Agent is 0.01 with respect to the water in the dispersion medium. Mass% to 0.5% by mass, preferably 0.05% to 0.3% by mass. The mixing ratio of the Changshuo jute powder and the polymer coagulant is a mass ratio of 9: 1 to 1: 9.

<< Viscosity of the water-purifying dispersion liquid> The viscosity of the water-purifying dispersion liquid is 20mPa‧S ~ 500mPa‧S, preferably 100mPa‧S ~ 450mPa‧S, and particularly preferably 150mPa‧S ~ 450mPa‧S. When the viscosity is lower than 20 mPa · S, the solid component is precipitated in the dispersion liquid. On the other hand, if the viscosity is higher than 500 mPa · S, the mixing of the water-purifying dispersion liquid and the discharged water is hindered, and the water-purifying performance cannot be fully exerted. The aforementioned viscosity is a numerical value of the temperature during storage, and usually the temperature is about 5 to 30 ° C. More preferably, it is about room temperature (around 23 ° C). The aforementioned viscosity was measured using a TVC-7 viscometer (B-type viscometer) manufactured by Toki Sangyo at room temperature of 23 ° C using a No. 1 spindle.

<<< Median diameter of solid content in dispersion liquid for water purification >> The median diameter of solid content in the dispersion liquid for water purification is 100 μm to 400 μm, and preferably 150 μm to 350 μm. When the median diameter of the solid content is less than 100 μm, water purification performance becomes insufficient. On the other hand, if the median diameter is larger than 400 μm, solid components are precipitated in the dispersion. The solid content in the dispersion is mainly affected by the insoluble content in Changshuo jute powder. Therefore, in order to make the median diameter within the aforementioned desired range, it is preferable to adjust the pulverization conditions of Changshuo jute, while classifying the Changshuo jute powder obtained by pulverization, and adjust the relevant grading conditions. Alternatively, when producing granules containing a mixture of Changshuo jute powder and a polymer aggregating agent, it is preferred to adjust the pulverization conditions of the granules and classify the granulated powder obtained by the pulverization, while adjusting the relevant classification conditions. In the present invention, a classification step of classifying Changshuo jute powder and a classification step of classifying granular powder derived from Changshuo jute powder and a polymer agglutinating agent are preferably performed by performing the above two steps To adjust the median diameter of the solid component to a desired range. Here, the median diameter (also referred to as d50) refers to the particle diameter when the particle size of the aforementioned particles is plotted, and the particle diameter is 50% of the total number in the figure (the larger particle diameter side and the particle The smaller diameter side is divided into equal size particle sizes). The dispersion liquid sample was diluted to 10 times, and the median diameter of the solid content in the dispersion liquid can be measured by a Morphogi G3 measuring machine of Malvern (manufactured by Spectris Co., Ltd.).

(Manufacturing method of water purification dispersion liquid) The manufacturing method of the water purification dispersion liquid of the present invention (hereinafter also referred to as the manufacturing method of the present invention) includes a dispersing step, which involves adding Changshu jute powder and a polymer coagulant It is disperse | distributed in water, and the water-purifying dispersion liquid of this invention is obtained. At this time, as long as the obtained water-purifying dispersion system satisfies the above-mentioned <Water-purifying dispersion characteristics>, the method for dispersing Changshuo jute powder and the polymer agglutinating agent is not particularly limited. The Changshuo jute powder and the polymer coagulant were dispersed in water to obtain the aforementioned water-purifying dispersion. However, at this time, in order to obtain a desired viscosity, distilled water must be used as a dispersion medium. Therefore, in order to obtain the dispersion for water purification of the present invention without limiting the type of the dispersion medium (water), the following aspects are preferred. In other words, it is better not to disperse Changshuo jute powder and polymer coagulant separately in water, but to first prepare a water purifier containing Changshuo jute powder and polymer coagulant, and then to water purifier The powder was dispersed in water to obtain a dispersion for water purification. The water purifying agent is preferably a water purifying agent formed by kneading granules of Changshuo jute powder and a polymer agglutinating agent. For example, the water purifying agent can be manufactured by a manufacturing method including the following steps: a kneading step, mixing the Changshuo jute powder with the polymer agglutinating agent and adding water to knead to obtain a kneaded product; forming In the step, the aforementioned kneaded material is formed into a shaped body; in the drying step, the aforementioned shaped body is dried to obtain a dried material; and in the pulverizing step, the aforementioned dried material is pulverized. Furthermore, after the aforementioned pulverization step, it is preferred to further include a classification step, which is to classify the particles by a sieve.

In the aforementioned forming step, for example, the aforementioned kneaded material may be formed by an arbitrary forming method to form a formed body. In the aforementioned drying step, it is preferable to use a multi-stage hot air dryer to dry the obtained compact at a temperature of 80 ° C. to 150 ° C. and conditions of 2 hours to 12 hours. It is preferable to dry the said molded object so that the moisture content of a molded object may become about 30%, for example, and to supply it to a crushing process. In addition, although the preferable aspect of the aforementioned drying step is the order of "drying the formed body obtained in the forming step and then pulverizing the dried formed body", it is also possible to perform "the formed body obtained in the forming step" Crushing, followed by a drying step to obtain particles ". In the aforementioned pulverizing step, a pulverizer is used, for example, an airflow type ultrafine pulverizer is used to pulverize the particles. In the aforementioned classification step, a classifier is used, and it is preferred to classify the pulverized powder using, for example, a vibratory screener or an air ratio classifier, so that the median diameter of the particles is within a desired range. As described above, the dispersion medium (water) of the water-purifying agent dispersion liquid obtained by dispersing the water-purifying agent powder first in water and preparing the water-purifying agent is not particularly limited, except for pure water (distilled water). It is possible to use water having a conductivity of 30 μS / cm or more. Even when such a dispersion medium is used, a desired viscosity can be obtained. This makes it possible to use cheaper tap water and groundwater. Even when tap water and groundwater are used in the dispersion, the concentration of inorganic ions in the discharged water can be reduced to a desired concentration or less, and excellent water purification performance can be exhibited. Moreover, even if it is stored for a long period of time, it is possible to suppress sedimentation of the solid content in the dispersion.

(Drained Water Treatment Method) The discharged water treatment method of the present invention is to remove the inorganic wastes in the discharged water by supplying the above-described water purification dispersion of the present invention to the discharged water. Examples of the inorganic waste include inorganic waste having at least one selected from the group consisting of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, and lead. By using the dispersion liquid for water purification of the present invention, sedimentation of solid components in the dispersion liquid can be suppressed even after long-term storage, and therefore, excellent water purification performance is exhibited even after long-term storage. Therefore, after the dispersion for water purification is produced, it is not necessary to directly supply it to the drain water, and even if it is supplied to the drain water after 24 hours or more, excellent water purification performance can be exhibited.

The discharged water treatment method of the present invention will be specifically described. For example, an alkali can be added to the discharged water to make the discharged water alkaline, so that at least a part of the heavy metal ions are not dissolved, and after the insolubilization step that forms a suspended solid, the production method of the present invention is added. The obtained water-purifying dispersion. By supplying the dispersion for water purification at a ratio of 0.5 ppm to 15 ppm with respect to the drainage, the inorganic waste is sedimented, and the sediment during sedimentation and separation can be removed to purify the discharged water.

[Examples] Hereinafter, although examples of the present invention will be described, the present invention is not limited to these examples.

(Example 1) Nickel sulfate hexahydrate was dissolved in pure water, and 800 g of an aqueous solution containing 50 mg / L of nickel ions was prepared as the discharge water (imaginary discharge water) used in the experiment. Next, sodium hydroxide was supplied to the above-mentioned discharged water so as to have a pH of 10, and the nickel was insolubilized by stirring. The nickel ion concentration of the supernatant liquid of the discharged water was 2 mg / L. <Water Purifying Agent> Next, Changshuo jute was used as a plant (produced in Guangzhou, China), and polypropylene amidamine (PAM) was used as a polymer agglutinating agent. The plants are dried by the sun to reduce the moisture content to 5% by mass or less. After drying, the plants are pulverized by an atomizer (hammer mill, manufactured by Zengxing Industry Co., Ltd.), and only use a particle size of 100 μm. Particles in the range of ~ 400μm, particles smaller than 100μm or larger than 400μm are removed from the sieve and removed (sieve removal). The granules 1 were obtained by the production method shown below, and the granules 1 were used as the water purification agent 1.

＜〈 Method of manufacturing water purification agent 〉＞ Add 5 times the mass of water to the mass of the solid content of the plant powder and the polymer aggregating agent to obtain a kneaded product (plant powder + polymer aggregating agent + water = 30kg). The kneaded product was placed in a planetary mixer (Mixer ACM-110 manufactured by Aiko Seisakusho Co., Ltd., with a capacity of 110 L), and kneaded by applying shear stress at a mixing speed of 150 rpm for 20 minutes. The obtained kneaded product is formed into a formed body. The formed article was dried using a multi-stage hot air dryer (a rack oven device manufactured by Chiyo Seisakusho Co., Ltd.) at 120 ° C for 3 hours, and then at 150 ° C for 2 hours. Next, the dried flakes were pulverized by using an air-flow type ultrafine pulverizer (Ceren Miller, manufactured by Masano Kogyo Co., Ltd.) to have a median diameter of 400 μm. The median diameter was measured with a mastersizer 2000 (manufactured by Malvern Instrument). Use a classifier (vibration sifter manufactured by Mikasa Co., Ltd.) and set it to sieved only the pulverized powder with a particle size in the range of 150 μm to 850 μm. Remove and remove (sieve out). In this way, the particles 1 are obtained and used as the water purification agent 1.

<Dispersion liquid> The water purification agent 1 was added with water having a conductivity of 110 μS / cm (tap water in Kanuma City, Tochigi Prefecture) and stirred to obtain a solid content of 0.1% by mass to obtain a dispersion liquid 1. Using the above method, the viscosity of the dispersion liquid 1 and the median diameter of the solid content in the dispersion liquid were measured.

<Characteristic Evaluation> The above-mentioned 180 L of dispersion liquid 1 was filled into an open-type vat having a capacity of 200 L. After leaving it in a dark place at 23 ° C for a certain period of time, the lid of the vat was removed, and the presence or absence of sedimentation was visually confirmed. Next, the dispersion liquid 1 containing the water-purifying agent 1 was added to the said discharged water, and the solid content was made into 7 mg / L, and it stirred. Here, the measurement method of "solid content" can be calculated | required by measuring the density | concentration of the mud of discharged water using a moisture meter, and inferring a solid content. The discharged water to which the dispersion liquid 1 was added was transferred to a sedimentation tank, and thereafter it was left to stand, and the state was visually confirmed every 1 hour. The time at which a clear separation of the upper clear liquid and the precipitate into two layers was confirmed was determined as the settling time. The upper clear solution was taken out and the ion concentration was measured by Lambda (Λ) 9000 (manufactured by Kyoritsu Chemical Research Institute). The following criteria were used to evaluate the water purification performance of this result. [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 ○ △: 1.4 mg / L or more and less than 1.7 mg / L △: 1.7 mg / L or more and less than 2.0 mg / L ╳: 2.0 mg / L or more The evaluation results of Example 1 are shown in Table 1-1. In Table 1-1, Plant Powder 1 refers to Changshu Jute (produced in Guangzhou, China), and PAM refers to Polyacrylamide (the same applies to Tables 1-2 to 1-5).

(Example 2) Except that the plant used in Example 1 was changed to "Zhong Jute No. 3" with the identification number of Wanpinjian Dengzi No. 1209006 for the Institute of Hemp Research of the Chinese Academy of Agricultural Sciences in Changshu Jute, and In Example 1, a water purification agent 2 was produced in the same manner. The dispersion liquid 2 obtained by dispersing the water purification agent 2 in water was used, and in the same manner as in Example 1, the characteristics of the water purification dispersion liquid were evaluated. The evaluation results of Example 2 are shown in Table 1-1. The plant powder 2 in Table 1-1 refers to "Medium Jute No. 3".

(Example 3) As an alternative to the plant of Example 2, "Zhong Jute No. 4" which is the identification number of the Institute of Hemp Research of the Chinese Academy of Agricultural Sciences of Changshu Jute, was used. Other than that, the water purification agent 3 was produced similarly to Example 2. The dispersion liquid 3 obtained by dispersing the water purification agent 3 in water was used, and the characteristics of the water purification dispersion liquid were evaluated in the same manner as in Example 1. The evaluation results of Example 3 are shown in Table 1-1. The plant powder 3 in Table 1-1 refers to "Medium Jute No. 4".

(Example 4) As an alternative to the plant of Example 3, "Chinese red hemp" with the identification number of Wanpinjian Dengzi No. 1209001 used by the Institute of Hemp Research of the Chinese Academy of Agricultural Sciences of Changshu Jute was used. Other than that, the water purification agent 4 was produced similarly to Example 3. The dispersion liquid 4 obtained by dispersing the water purification agent 4 in water was used, and in the same manner as in Example 1, the characteristics of the water purification dispersion liquid were evaluated. The evaluation results of Example 4 are shown in Table 1-1. The plant powder 4 in Table 1-1 refers to "medium kenaf".

Comparative Example 1 A comparative water purification agent 1 was produced in the same manner as in Example 3, except that the concentration of the dispersion liquid in Example 3 was adjusted to 0.005 mass% and the viscosity of the dispersion liquid was adjusted to 15 mPa · S. The comparative dispersion liquid 1 in which the comparative water purification agent 1 was dispersed in water was used, and the characteristics of the dispersion liquid for water purification were evaluated in the same manner as in Example 1. The evaluation results of Comparative Example 1 are shown in Table 1-2. The settling result of the vat in Comparative Example 1 was shown as "Yes". This result refers to a state in which the bottom of the vat cannot be seen due to the sediment.

(Example 5) A water purification agent 5 was produced in the same manner as in Example 3, except that the concentration of the dispersion liquid in Example 3 was adjusted to 0.02% by mass and the viscosity of the dispersion liquid was adjusted to 20 mPa · S. The dispersion liquid 5 obtained by dispersing the water purification agent 5 in water was used, and in the same manner as in Example 1, the characteristics of the water purification dispersion liquid were evaluated. The evaluation results of Example 5 are shown in Table 1-2. The result of the settling of the vat in Example 5 was shown as "slightly present". This result refers to the state in which the bottom of the vat can be seen despite the sediment.

(Example 6) A water purification agent 6 was prepared in the same manner as in Example 3 except that the concentration of the dispersion liquid in Example 3 was adjusted to 0.5% by mass and the viscosity of the dispersion liquid was adjusted to 500 mPa · S. The dispersion liquid 6 obtained by dispersing the water purification agent 6 in water was used, and in the same manner as in Example 1, the characteristics of the water purification dispersion liquid were evaluated. The evaluation results of Example 6 are shown in Table 1-2.

Comparative Example 2 A comparative water purification agent 2 was produced in the same manner as in Example 3, except that the concentration of the dispersion liquid in Example 3 was adjusted to 0.6% by mass and the viscosity of the dispersion liquid was adjusted to 600 mPa · S. A comparative dispersion liquid 2 obtained by dispersing a comparative water purification agent 2 in water was used, and the characteristics of the dispersion liquid for water purification 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) A water purification agent 7 was produced in the same manner as in Example 3, except that the concentration of the dispersion liquid in Example 3 was adjusted to 0.08% by mass and the viscosity of the dispersion liquid was adjusted to 150 mPa · S. The dispersion liquid 7 obtained by dispersing the water purification agent 7 in water was used, and in the same manner as in Example 1, the characteristics of the water purification dispersion liquid were evaluated. The evaluation results of Example 7 are shown in Table 1-2.

(Example 8) A water purification agent 8 was produced in the same manner as in Example 3 except that the concentration of the dispersion liquid in Example 3 was adjusted to 0.4% by mass and the viscosity of the dispersion liquid was adjusted to 450 mPa · S. The dispersion liquid 8 obtained by dispersing the water purification agent 8 in water was used, and the characteristics of the water purification dispersion liquid 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) By changing the sieving conditions when the dried plant matter was pulverized and classified, the median diameter of the solid content in the dispersion liquid of Example 3 was adjusted to 80 μm, and was the same as Example 3 Preparation of comparative water purification agent 3. The characteristics of the water-purifying dispersion liquid were evaluated in the same manner as in Example 1 using a comparative dispersion liquid 3 in which the comparative water-purifying agent 3 was dispersed in water. The evaluation results of Comparative Example 3 are shown in Tables 1-3.

(Example 9) By changing the sieving conditions when the dried plant matter was pulverized and classified, except that the median diameter of the solid content in the dispersion liquid of Example 3 was adjusted to 120 μm, it was the same as Example 3 Make water purifying agent 9. The dispersion liquid 9 obtained by dispersing the water purification agent 9 in water was used, and the characteristics of the water purification dispersion liquid were evaluated in the same manner as in Example 1. The evaluation results of Example 9 are shown in Tables 1-3.

(Comparative Example 4) A comparative water purification agent 4 was produced in the same manner as in Example 3, except that the classification step after the dried plant matter was pulverized in Example 3. The characteristics of the water-purifying dispersion liquid were evaluated in the same manner as in Example 1 using a comparative dispersion liquid 4 in which the comparative water-purifying agent 4 was dispersed in water. The evaluation results of Comparative Example 4 are shown in Tables 1-3.

(Reference Example 1) The comparative water purification agent 4 prepared in Comparative Example 4 was used, and the characteristics of the water purification dispersion liquid were evaluated in the same manner as in Example 1. However, in Reference Example 1, the storage time in the vat was 1 day (24 hours). The evaluation results of Reference Example 1 are shown in Tables 1-3.

(Example 10) By changing the sieving conditions when the dried plant matter was pulverized and classified, except that the median diameter of the solid content in the dispersion liquid of Example 3 was adjusted to 150 μm, it was the same as Example 3 Make water purification agent 10. The dispersion liquid 10 obtained by dispersing the water purification agent 10 in water was used, and in the same manner as in Example 1, the characteristics of the water purification dispersion liquid were evaluated. The evaluation results of Example 10 are shown in Tables 1-3.

(Example 11) By changing the sieving conditions when the dried plant matter was pulverized and classified, the median diameter of the solid content in the dispersion liquid of Example 3 was adjusted to 350 μm, and was the same as Example 3 Make water purification agent 11. The dispersion liquid 11 obtained by dispersing the water purification agent 11 in water was used, and the characteristics of the water purification dispersion liquid were evaluated in the same manner as in Example 1. The evaluation results of Example 11 are shown in Tables 1-3.

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

(Example 13) A dispersion liquid 13 was produced in the same manner as in Example 3, except that the water used as the dispersion liquid in Example 3 was changed to water having an electrical conductivity of 30 μS / cm obtained by appropriately mixing tap water and distilled water in Kanuma City, Tochigi Prefecture. . The characteristics of the dispersion liquid for water purification were evaluated using the dispersion liquid 13 in the same manner as in Example 1. The evaluation results of Example 13 are shown in Tables 1-4.

(Example 14) The classification step of the plant and high-scoring aggregating agent blend in Example 3 was not performed. Other than that, the water purification agent 14 was produced similarly to Example 3. Using the dispersion liquid 14 in which the water purification agent 14 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 14 are shown in Tables 1-4.

(Example 15) A polyamine was used as a substitute for the polyacrylamide in Example 3. Other than that, the water purification agent 15 was produced similarly to Example 3. The dispersion liquid 15 obtained by dispersing the water purification agent 15 in water was used, and in the same manner as in Example 1, the characteristics of the water purification dispersion liquid were evaluated. The evaluation results of Example 15 are shown in Tables 1-4.

(Example 16) A dispersion liquid 16 was produced in the same manner as in Example 3, except that the water used as the dispersion liquid in Example 3 was changed to water (distilled water) having a conductivity of 1 μS / cm. The characteristics of the dispersion liquid for water purification were evaluated using the dispersion liquid 16 in the same manner as in Example 1. The evaluation results of Example 16 are shown in Tables 1-4.

(Example 17) Instead of producing the pellets of Example 3, each of the substances of the polymer agglutinating agent and the plant powder was dispersed in water. Except for the above, a dispersion liquid 17 was prepared in the same manner as in Example 3. The characteristics of the dispersion liquid for water purification were evaluated using the dispersion liquid 17 in the same manner as in Example 1. The evaluation results of Example 17 are shown in Tables 1-4.

(Example 18) Potassium fluoride was dissolved in pure water, and 800 g of an aqueous solution containing 2,500 mg / L of fluoride ions was prepared as the discharge water (virtual discharge water) used in the experiment. Next, 8.6 mg / L of calcium chloride was added to the above-mentioned discharged water, and sodium hydroxide was added to adjust the pH to 7.5 to 9.0, and the fluorine was not dissolved while stirring. With this operation, the upper clear liquid containing micro-flock in the fluorine aqueous solution was separated from the precipitate. At this point, the ion concentration of the supernatant liquid of the discharged water was 10 mg / L. A dispersion liquid 3 obtained by dispersing a water-purifying agent 3 in water was used in the same manner as in Example 3 except that the above-mentioned discharged water was used, and the characteristics of the water-purifying dispersion liquid were evaluated. The evaluation results of Example 18 are shown in Tables 1-5.

(Example 19) Ferric chloride hexahydrate was dissolved in pure water, and 800 g of an aqueous solution containing 200 mg / L of iron ions was prepared as the discharge water (virtual discharge water) used in the experiment. Next, while adding sodium hydroxide to the above-mentioned discharged water to a pH of 6.5 to 9.0, the iron was not dissolved while stirring. At this point, the ion concentration of the supernatant liquid of the discharged water was 2 mg / L. A dispersion liquid 3 obtained by dispersing a water-purifying agent 3 in water was used in the same manner as in Example 3 except that the above-mentioned discharged water was used, and the characteristics of the water-purifying dispersion liquid were evaluated. The evaluation results of Example 19 are shown in Tables 1-5.

(Example 20) Copper sulfate pentahydrate was dissolved in pure water, and 800 g of an aqueous solution containing 100 mg / L of copper ions was prepared as the discharge water (imaginary discharge water) used in the experiment. Next, while adding sodium hydroxide to the discharged water to a pH value of 7.0 to 8.0, the copper was not dissolved while stirring. At this point, the ion concentration of the supernatant liquid of the discharged water was 2 mg / L. A dispersion liquid 3 obtained by dispersing a water-purifying agent 3 in water was used in the same manner as in Example 3 except that the above-mentioned discharged water was used, and the characteristics of the water-purifying dispersion liquid were evaluated. The evaluation results of Example 20 are shown in Tables 1-5.

(Example 21) Zinc nitrate hexahydrate was dissolved in pure water, and 800 g of an aqueous solution containing 100 mg / L of zinc ions was prepared as the discharge water (virtual discharge water) used in the experiment. In addition, while adding sodium hydroxide to the discharged water to have a pH of 9.0 to 9.5, the zinc was not dissolved while stirring. At this point, the ion concentration of the supernatant liquid of the discharged water was 5 mg / L. A dispersion liquid 3 obtained by dispersing a water-purifying agent 3 in water was used in the same manner as in Example 3 except that the above-mentioned discharged water was used, and the characteristics of the water-purifying dispersion liquid were evaluated. The evaluation results of Example 21 are shown in Tables 1-5.

(Example 22) Potassium dichromate was dissolved in pure water, and 800 g of an aqueous solution containing 100 mg / L of chromium ions was prepared as discharge water for use in experiments (virtual discharge water). In addition, while adding sodium hydroxide to the discharged water to a pH value of 6.0 to 7.5, the chromium was not dissolved while stirring. At this point, the ion concentration of the supernatant liquid of the discharged water was 5 mg / L. A dispersion liquid 3 obtained by dispersing a water-purifying agent 3 in water was used in the same manner as in Example 3 except that the above-mentioned discharged water was used, and the characteristics of the water-purifying dispersion liquid were evaluated. The evaluation results of Example 22 are shown in Tables 1-5.

(Example 23) Arsenic trioxide was dissolved in pure water, and 800 g of an aqueous solution containing 10 mg / L of arsenic ions was prepared as discharge water for use in experiments (virtual discharge water). Next, 65 mg / L of ferric chloride and 354 mg / L of calcium chloride were added to the discharged water, and then sodium hydroxide was added to adjust the pH to 8.0 to 9.5, and arsenic was not dissolved while stirring. At this point, the ion concentration of the supernatant liquid of the discharged water was 0.05 mg / L. A dispersion liquid 3 obtained by dispersing a water-purifying agent 3 in water was used in the same manner as in Example 3 except that the above-mentioned discharged water was used, and the characteristics of the water-purifying dispersion liquid were evaluated. The evaluation results of Example 23 are shown in Tables 1-5. However, in Example 23, after the settling time was measured in the same manner as in Example 3, the upper clear liquid was taken out, and its volume was concentrated to 1/100 by an evaporator, and the ion concentration was measured. As for the arsenic ion, if it is judged that the preferable result of the ion concentration is 0.01 mg / L or less, the result is evaluated as ◎.

[Table 1-1]

[Table 1-2]

[Table 1-3]

[Table 1-4]

[Table 1-5]

In summary, from the results of Examples 1 to 23, it can be confirmed that the water-purifying dispersion system of the present invention exhibits excellent water-purifying performance, and the water-purifying performance does not decrease after long-term storage. It can be produced satisfactorily at low cost.

no

[Fig. 1] It is a figure showing the identification number of "Medium Jute No. 3" used in the present invention. [Fig. 2] It is a figure showing the identification number of "Medium kenaf" used in the present invention.

Claims (11)

A dispersion for water purification, characterized in that it contains water, and the total content of Changshuo jute powder and polymer coagulant is 0.01 mass% to 0.5 mass% with respect to the water, wherein the water purification The viscosity of the dispersion was 20 mPa · S to 500 mPa · S, and the median diameter of the solid component in the water purification dispersion was 100 μm to 400 μm. The dispersion for water purification according to claim 1, wherein the identification number of the aforementioned Changshu Jute Department of the Institute of Hemp Research of the Chinese Academy of Agricultural Sciences is "China Jute No. 4" of Guojian Ma 2013. The dispersion for water purification according to claim 1, wherein the identification number of the aforementioned Changshu Jute Department of the Institute of Hemp Research of the Chinese Academy of Agricultural Sciences is Wan Pinjian No. 1209006 "Zhong Jute No. 3". The dispersion for water purification according to claim 1, wherein the identification number of the aforementioned Changshu Jute Department of the Institute of Hemp Research of the Chinese Academy of Agricultural Sciences is "Chinese Red Hemp" of Wanpinjian Dengzi 1209001. The water-purifying dispersion according to claim 1, wherein the polymer coagulant is polyacrylamide. The water purification dispersion liquid according to claim 1, wherein the mass composition ratio of the above-mentioned Changshuo jute powder to the polymer coagulant is 9: 1 to 1: 9. A method for producing a water-purifying dispersion, which is to produce the water-purifying dispersion according to any one of claims 1 to 6, characterized in that: a kneading step is performed by mixing the Changshuo jute powder with the polymer The aggregating agent is mixed and added with water to knead to obtain a kneaded product; a forming step of forming the aforementioned kneaded material to form a shaped body; a drying step of drying the aforementioned shaped body to obtain a dried material; and a pulverizing step of pulverizing the dried material; Disperse the powder of the water purification agent manufactured by the manufacturing method including the above steps in water, and manufacture the aforementioned water purification dispersion liquid. The method for producing a water purification dispersion liquid according to claim 7, wherein the conductivity of the water used for the dispersion is 30 μS / cm or more. A method for treating discharged water by removing the inorganic-based waste in the discharged water by supplying the water-purifying dispersion liquid as set forth in any one of claims 1 to 6 to the discharged water. The method for treating discharged water according to claim 9, wherein the discharged water system has an inorganic system selected from the group consisting of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, tin, and lead. Waste. The method for treating discharged water according to claim 10, wherein the dispersion liquid for water purification is supplied to the discharged water after 24 hours or more of manufacturing.