TWI602607B - Flocculant mixture and flocculation method - Google Patents

Description

Coagulant mixture and coacervation method

The present invention relates to a coagulant mixture and a coacervation process.

The quality of industrial wastewater changes over time and technological innovations, and methods for wastewater treatment need to be continually optimized. For example, when a request to reduce the thickness of a glass substrate for a flat panel display is received, the amount of polishing the glass substrate using a liquid medicament such as hydrofluoric acid increases. Then, the polishing wastewater discharged from the glass substrate is extremely concentrated, and it is said that this kind of wastewater treatment is difficult.

A coagulant containing at least one of mulukhiyah, dried yellow arrow cherries, and scutellaria chinensis extract is known from Japanese Laid-Open Patent Application No. Hei 11-114313.

The coagulant disclosed in Japanese Laid-Open Patent Application No. Hei 11-114313 is effective for agglomerating a group of suspended particles. However, there is a need for a coagulant which concentrates concentrated wastewater with higher performance.

Therefore, it is desirable to provide a coagulant mixture and agglomeration method for condensing concentrated wastewater with higher performance.

According to an embodiment of the present invention, there is provided a coagulant mixture comprising a polymer coagulant formed from an anionic polymer coagulant and/or a nonionic polymer coagulant and a water-soluble viscous substance derived from a plant, wherein The value of VC ₀ /VC ₁ ) is less than 15, wherein VC ₀ is obtained by dissolving 0.5% by mass of the polymer coagulant in water having a conductivity of not more than 200 μS/cm, and VC ₁ is The 0.5% by mass of the polymer coagulant is dissolved in water having a conductivity of not more than 200 μS/cm and a viscosity obtained by dissolving 2% by mass of sodium nitrate therein.

According to an embodiment of the present invention, there is provided a coacervation method comprising adding a coagulant mixture to a suspension (waste water), and then coagulating and separating the particles in the suspension. It should be noted that the water-soluble viscous substance is partially dissolved in the suspension (waste water), and the remainder is dispersed in the suspension.

The coagulant mixture according to this embodiment or the coagulant mixture in the coagulation method according to this embodiment (hereinafter, collectively referred to as "agglomerate mixture according to the embodiment" or the like in some cases) includes agglomeration by an anionic polymer. The polymer coagulant formed by the agent and/or the nonionic polymer coagulant and the water-soluble viscous substance derived from the plant, and the viscosity properties of the polymer coagulant are defined. It should be noted that since the polymer coagulant and the water-soluble viscous substance derived from the plant are compatible with each other and can exert their respective properties as a synergistic effect, the aggregation rate during the wastewater treatment can be improved even if the addition amount is small. And significantly improve the clarity of the supernatant after the wastewater treatment and the clarity of the filtrate after filtration of the filter cake. This is because the polymer coagulant and the water-soluble viscous substance derived from the plant can exert different agglomeration effects on sludge particles (colloidal particles) having various particle diameters or surface potentials. Therefore, such a coagulant mixture exhibits a high property against condensed concentrated wastewater (waste liquid), and can be advantageously used in various fields such as wastewater treatment, liquid crystal panel manufacturing factory, semiconductor device manufacturing, electronic device manufacturing, electronic component manufacturing. , electrical equipment manufacturing, electrical component manufacturing, paper mills, water plants / sewers, fermentation industry, paper industry and civil engineering and civil engineering. It should be noted that since the value of (VC ₀ /VC ₁ ) is less than 15, the coagulant mixture or the like according to the present invention exhibits excellent cohesive properties. On the other hand, if the value of VC ₁ is small, that is, the value of (VC ₀ /VC ₁ ) is not less than 15, the aggregation rate is too slow. Therefore, the cohesive properties of the coagulant mixture are unacceptable.

Detailed description of the best mode embodiment thereof as illustrated in the accompanying drawings These and other objects, features and advantages of the present invention will become more apparent.

Hereinafter, embodiments of the invention will be described based on examples. However, the embodiments of the present invention are not limited to the examples, and the various numerical values and materials in the examples are merely examples. It should be noted that the description will be given in the following order.

1. Coagulant mixture and coacervation method according to an embodiment of the present invention, general description

2. Example 1 (coagulant mixture and coacervation method), other

[Coagulant Mixture and Coagulation Method According to Embodiment of the Present Invention, General Description]

The coagulant mixture or the like according to this embodiment preferably has an angle of repose of no more than 60°, advantageously no more than 50°, more advantageously no more than 40°. Here, the angle of repose is, for example, three slopes of a powder pile (cone) formed by depositing powder through a funnel at a predetermined height from a table having a predetermined diameter, and applying a predetermined vibration if necessary. The average of the angles. It can be said that the coagulant mixture having a small angle of repose has a superior fluidity. If the coagulant mixture has an angle of repose of more than 60, the fluidity of the coagulant mixture is too low. Thus, the coagulant mixture will agglomerate upon dissolution in water or, for example, cause agglomeration of the coagulant mixture in the wastewater because it is not uniformly dispersed in the wastewater during wastewater treatment. Therefore, sufficient agglomeration effect cannot be achieved. Further, when the coagulant mixture is mixed, it is easy to cause the polymer coagulant formed of the anionic polymer coagulant and/or the nonionic polymer coagulant to be separated from the water-soluble viscous substance derived from the plant. It should be noted that the angle of repose can be measured by using a commercially available powder testing device (powder tester).

Further, in the coagulant mixture or the like according to this embodiment, which includes the above advantageous forms, the mass ratio of (polymer flocculant/plant-derived water-soluble viscous substance) is advantageously from 20/1 to 1/20. .

Further, in the coagulant mixture or the like according to this embodiment, which includes the above advantageous forms, the water-soluble viscous substance derived from the plant may be in the form of any one of the following:

(a) Forms of glycoproteins (such as gelatin and fucoidan)

(b) a form of glycoprotein (such as mucin)

(c) Forms containing condensed materials

(d) comprising at least one selected from the group consisting of scutellaria chinensis, sorghum jute, jute, arborvitae, red phoenix, banana, okra, Japanese yam, cactus, seaweed, wakame spp. The material of the group or its dry product. Here, examples of the material containing pectin or fucoidan include spruce leaves and fruits of Huanghuajianzhi, Changchun jute, jute, Luokui, Hongfengcai, banana, okra, cactus, seaweed, wakame Saccharomyces cerevisiae, and examples of mucin-containing materials include Huanghuajianzhi, Changchun jute, jute, arborvitae, red phoenix, banana, okra, cactus, seaweed, sauerkraut spore leaf and fruit sac ponytail Algae. Further, all of the materials described in (d) contain an isomeric polysaccharide and a glycoprotein.

Further, in the coagulation method according to this embodiment, which includes the above advantageous form, the suspension (waste water) may have a conductivity of not more than 500 μS/cm.

In the coagulant mixture or coacervation method according to this embodiment (hereinafter collectively referred to as "this embodiment"), which includes the above advantageous forms, examples of the anionic polymer flocculant include a partial hydrolyzate of polyacrylamide , copolymer of acrylamide and acrylic acid, copolymer of acrylamide and metal acrylate, (meth)acrylic polymer, sodium alginate, sodium guar, sodium carboxymethylcellulose and sodium starch salt. Here, examples of the (meth)acryl-based polymer include a partial hydrolyzate of polymethacrylamide, a copolymer of acrylic acid or methacrylic acid with acrylamide or methacrylamide and a salt thereof, acrylic acid or Terpolymer of methacrylic acid, acrylamide or methacrylamide and 2-propenylamine-methylpropanesulfonic acid, vinylsulfonic acid or vinylmethanesulfonic acid and salts thereof, and polypropylene fluorene A sulfomethylated compound of an amine or polymethacrylamide and a salt thereof. Further, examples of the nonionic polymer coagulant include polyacrylamide, polymethacrylamide, starch, guar gum, gelatin, and poly Oxyethylene and polyoxypropylene.

Further, any part of the leaves, stems, trunks, roots, fruits and petals of the raw material of the raw material which is a raw material of the water-soluble viscous substance derived from the plant in the embodiment can be used. However, in particular, it is preferable to use (in particular) the parts of the leaves, stems, stems and flowers, or more specifically, the leaves and stems, because they are easy to process into powders. There are no specific restrictions on the planting location of the raw plant or its growing season. The water-soluble viscous material derived from the plant is advantageously in the form of a dry product obtained by drying the raw material plants at a temperature below 100 °C. In the case where the raw plant plant is dried at not lower than 100 ° C, a water-soluble polymer component (specifically, for example, a polymer heteropolysaccharide) contained in the raw material plant may be thermally deteriorated (for example) The molecular weight is lowered by cutting the main chain or the side chain of the polymer heteropolysaccharide, and is insoluble due to intramolecular crosslinking, resulting in a carbonization reaction. As a result, the cohesive properties can be reduced. Examples of the drying method include drying, drying in a cool place, hot air drying, vacuum drying, and freeze drying. Further, it is advantageous to pulverize the raw material plant before drying the raw material plant at a temperature lower than 100 ° C or while drying. For comminution, a common pulverizer can be used.

In this embodiment, a coagulant mixture which has been previously combined with, for example, the following coagulating aid, inorganic coagulant and organic coagulant may be used. Alternatively, the coagulant mixture can be used in combination therewith (i.e., separately added to the suspension). The coacervation properties can be further improved by combining the coagulant mixture with such formulations, or in combination with the coagulant mixture. In the case of being used together with the inorganic coagulant, it is preferred to add the coagulant mixture or the like according to this embodiment after the inorganic coagulant is added to the suspension. Further, in the case of use together with an organic coagulant, it is preferred to add the coagulant mixture or the like according to this embodiment at the same time as or after the addition of the organic coagulant to the suspension.

Here, examples of the coagulating aid include slaked lime, sodium citrate, bentonite, and fly ash. Further, examples of the inorganic coagulant include aluminum sulfate (alum), polyaluminum chloride (PAC), aluminum Sodium, ferrous sulfate, ferric chloride, ferric sulfate, green chlorinated chloride, modified basic aluminum sulfate (LACS) and activated vermiculite. Further, examples of the organic coagulant include condensation of dimethyl diallyl ammonium chloride, alkyl epichlorohydrin condensate, polyethyleneimine, alkylene dichloride and polyalkylene polyamine. The product, dicyanamide-formalin condensate, aniline formaldehyde hydrochloride polymer, polyhexamethylene thiourea acetate and polyvinylbenzyltrimethylammonium chloride.

Further, the coagulant mixture or the like according to the embodiment may be combined with a chelating resin, a chelating agent, activated carbon, ozone water, an ion exchange resin, an ion exchange membrane, a water absorbing resin, hydrogen peroxide water, chlorine, liquid chlorine, sodium hypochlorite, Chlorine dioxide, bleaching powder, chlorinated isocyanuric acid, diatomaceous earth, photocatalyst (such as titanium oxide), a co-treatment agent (such as a biological treatment agent) or the like, or a combination thereof.

In some cases, the raw material plants which are the raw materials of the coagulant mixture or the like according to the embodiment may be subjected to acid treatment and/or alkali treatment.

In the coagulation method according to this embodiment, the coagulant mixture or the like according to the embodiment is advantageously dissolved and dispersed (partially) before the coagulant mixture or the like according to the embodiment is added to the suspension. Dissolved, and the remainder is dispersed, the same applies to the form in water below. Then, in the method of adding the coagulant mixture or the like according to the embodiment to the suspension (waste water), the coagulant mixture or the like according to the embodiment may be directly added to the suspension in the form of a powder. . However, it is more advantageous to add the coagulant mixture or the like according to this embodiment to the suspension dissolved and dispersed in water. After the particles in the suspension are coagulated and separated, they can be subjected to dehydration treatment. In the dehydration treatment, a common dehydrator can be used. For example, a filter press, a vacuum dehydrator, a belt press dehydrator, a centrifugal dehydrator, and a screw press can be used.

The addition amount of the coagulant mixture or the like according to this embodiment with respect to the suspension is significantly different depending on the type of the target suspension (waste water) or the combination with another preparation. Therefore, the amount of addition can be determined by performing various tests. However, approximately 0.05 mg/l to 200 Mg/l (0.05 ppm to 200 ppm), advantageously 0.1 mg/l to 100 mg/l (0.1 ppm to 100 ppm), more advantageously 0.5 mg/l to 20 mg/l (0.5 ppm to 20 ppm) as an example. If the amount of the aggregating agent mixture or the like according to this embodiment is too small, a favorable agglomeration effect may not be obtained. If the amount added is too large, the agglomeration effect can be reduced.

The viscosity can be obtained by dissolving and dispersing into a sample having a predetermined concentration by using a Brookfield viscometer at 25 ° C and 100 rpm. In addition, the conductivity can be measured in accordance with JIS K0130:2008. In addition, the angle of repose can be measured in accordance with JIS R9301-2-2:1999.

[Example 1]

Example 1 relates to a coagulant mixture and a coacervation method according to this embodiment.

The coagulant mixture according to Example 1 comprises (A) a polymer coagulant composed of an anionic polymer coagulant and/or a nonionic polymer coagulant, and (B) a water-soluble viscous material derived from a plant, wherein (VC) The value of ₀ /VC ₁ ) is less than 15, wherein VC ₀ is a viscosity obtained by dissolving 0.5% by mass of the polymer coagulant in water having a conductivity of not more than 200 μS/cm, and VC ₁ is at 0.5. The mass% of the polymer coagulant is dissolved in water having a conductivity of not more than 200 μS/cm and a viscosity obtained by dissolving 2% by mass of sodium nitrate therein. Here, the wastewater contains a large variety of salts. This wastewater was modeled and sodium nitrate (NaNO ₃ ) was dissolved therein to simulate the state of the wastewater to some extent.

Further, in the coagulation method according to Example 1, the coagulant mixture according to Example 1 was added to the suspension, and the particles in the suspension were coagulated and separated.

In Example 1, for the raw material plant of the water-soluble viscous substance derived from the plant, the arrow flower of the arrowhead, the jute (leaf, stem, trunk, flower and root), jute (leaf and stem) are used. And dry products of seaweed (leaves, stems and pseudo roots). Further, in Comparative Example 1, in the case of a raw material plant (hereinafter referred to as "additive") which forms a coagulant mixture, a powdered product of yellow arrow gum, Japanese komatsu (leaves and stems) and spinach are used. Dry product (leaves and stems). It should be noted that the powder of the arrowhead flower and the pulverization method of the powdered product of the arrowhead flower and the particle size obtained therefrom are different. The average particle size of Huanghua Jianzhi powder is 100 mesh, while the powdered product of Huanghuajianzhi has 2 mesh on each product.

Then, the raw material plants are dried at a predetermined temperature (but at a temperature lower than 100 ° C) for a predetermined period of time by a hot air dryer, thereby obtaining a water-soluble viscous substance derived from the plant according to Example 1. The water-soluble viscous substance derived from the plant has a water content ratio of 4.5% by mass to 25% by mass, depending on drying conditions. The same treatment was carried out for the additive of Comparative Example 1. Then, the water-soluble viscous substance derived from the plant according to Example 1 thus obtained was pulverized using a food processor for cooking. The same treatment was also carried out for the additive of Comparative Example 1, except for the powdered product of Huanghuajianzhi.

As the anionic polymer flocculating agent, a partial hydrolyzate (anionic polymer coagulant A to an anionic polymer coagulant H) of a commercially available polydecylamine is used. Further, as the nonionic polymer flocculating agent, a commercially available polypropylene decylamine (nonionic polymer coagulant I) is used. It should be noted that the proportion of partial hydrolysis of the anionic polymer coagulant A to the anionic polymer coagulant H is different. Specifically, the proportion of partial hydrolysis in the anionic polymer coagulant A is 3%, and the order of the anionic polymer coagulant B, the anionic polymer coagulant C, the anionic polymer coagulant D, ... The higher the proportion of hydrolysis. The proportion of partial hydrolysis of the anionic polymer coagulant H is 100%. Further, the hydrolysis rate of the nonionic polymer coagulant I was 0%. Each polymer coacervation agent of VC VC viscosity measurement value of ₀ and ₁ (unit: 10 ^-3 Pa.s, centipoise), and a value (VC ₀ / VC ₁₎ are shown in the Table 1. However, the anionic polymeric flocculant E to H of the anionic polymeric flocculant (VC ₀ / VC ₁₎ of not less than 15, and thus, is not satisfied (VC ₀ / VC ₁₎ of claim 15 is less than the value of the system.

Viscosity measurement was performed in the following manner. Specifically, water (pure water) having a conductivity of not more than 200 μS/cm is used. Then, the viscosity VC _{0 was} measured by dissolving 0.5% by mass of the polymer coagulant according to the examples and the comparative examples in water. Further, the viscosity VC _{1 was} measured by dissolving 0.5% by mass of the polymer coagulant according to the examples and the comparative examples in water and dissolving 2% by mass of sodium nitrate therein. The viscosity was measured using a Brookfield viscometer (manufactured by Toki Sangyo Co., LTD). More specifically, the temperature of the sample was adjusted to 25 ° C, and the viscosity was measured at a rotation speed of 100 rpm.

Table 2 shows the mass ratio of the anionic polymer coagulant and the nonionic polymeric coagulant used in the examples 1-A to the examples 1-Q to the water-soluble viscous material derived from the plant (polymer coagulant/plant derived) Water-soluble viscous substance). Further, Table 3 shows the mass ratio (polymer coagulant/additive) of the anionic polymer coagulant and the cationic polymer coagulant to the additive for comparison of Examples 1-A to Comparative Examples 1-O. It is to be understood that the mass ratio of (polymer flocculant/water-soluble viscous substance derived from plant) or the mass ratio of (polymer flocculant/additive) is expressed by "mixing ratio" in Tables 2 and 3.

For the suspension (waste water) used for the coagulation evaluation, the following suspensions were used. Specifically, "semiconductor wastewater A" is a wastewater obtained by pH adjustment and primary coagulation treatment of fluorine-containing wastewater discharged from a liquid crystal panel manufacturer. It should be noted that the "semiconductor wastewater A" has a pH of 7.49, a suspended solids (SS) amount of 13 mg/l, and a conductivity of 2470 μS/cm. Further, the "semiconductor wastewater B" is a wastewater obtained by pH-adjusting and primary agglomeration treatment of fluorine-containing wastewater discharged from a liquid crystal panel manufacturer different from the semiconductor wastewater A. It should be noted that the "semiconductor wastewater B" has a pH of 7.96, a suspended solids (SS) amount of 17 mg/l, and a conductivity of 2690 μS/cm. In addition, "semiconductor wastewater C" is discharged by a liquid crystal panel manufacturer different from the semiconductor wastewater A and the semiconductor wastewater B. The wastewater obtained by pH adjustment and primary coagulation treatment of the fluorine-containing wastewater. It should be noted that the "semiconductor wastewater C" has a pH of 7.52, a suspended solids (SS) amount of 9 mg/l, and a conductivity of 2230 μS/cm.

For the method of evaluating cohesion, the following method is used. Specifically, 80 ml of each suspension for coagulation evaluation was poured into a 100 ml graduated cylinder with a stopper. Then, a coagulant mixture or the like according to the examples and the comparative examples was added to the suspension for coagulation evaluation by a measuring liquid pipette so as to have a predetermined concentration (for the value of the solid content equivalent, see Table 2 and Table 3). Next, the cylinder was immediately stirred by turning it upside down 10 times, and thereafter allowed to stand. Then, the sedimentation rate of the suspended particles was measured. It should be noted that the sedimentation rate is calculated based on the time period in which the agglomeration interface is lowered from the position of 60 ml to the position of 40 ml. In addition, the clarity of the supernatant after standing for 3 minutes was evaluated by visual inspection. The above measurement results are shown in Table 2 and Table 3. The "○" in the visual inspection result indicates that the supernatant was clarified, "△" indicates that the supernatant was a little cloudy, and "X" indicates that the supernatant was cloudy.

In Examples 1-A to 1-Q, the angle of repose of each coagulant mixture is not more than 60°, and the value of (VC ₀ /VC ₁ ) is less than 15, and (the polymer flocculant/plant-derived water solubility) The mass ratio of the viscous substance is 20/1 to 1/20. Then, the coagulant mixture according to Examples 1-A to 1-Q was injected into the suspension for coagulation evaluation and stirred. The coagulant mixture is dissolved and dispersed in a suspension for coagulation evaluation, and the sludge is precipitated, thereby causing the supernatant to settle. Therefore, it was confirmed that the coagulant mixtures have excellent cohesive properties.

On the other hand, in Comparative Example 1-A, Comparative Example 1-B, Comparative Example 1-C, and Comparative Example 1-D, the value of (VC ₀ /VC ₁ ) was not less than 15, and the supernatant was somewhat cloudy or turbid. Turbidity, the sedimentation rate is slow, and the cohesive properties are unacceptable.

Further, in Comparative Example 1-E, since the powdery product of the arrowhead was used, the value of the angle of repose exceeded 60°. The coagulant mixture was injected into the suspension for coagulation evaluation and stirred. Then, the coagulant mixture was agglomerated in the suspension for coagulation evaluation, the supernatant was cloudy, no sedimentation rate data was obtained, and the coagulation performance was unacceptable.

Further, in Comparative Example 1-F, the water-soluble viscous substance derived from the plant was not used, the supernatant was somewhat cloudy, the sedimentation rate was slow, and the aggregation property was unacceptable.

Further, in Comparative Example 1-G to Comparative Example 1-J, the mass ratio of (polymer flocculant/plant-derived water-soluble viscous substance) was not in the range of 20/1 to 1/20, and the supernatant was It is a bit turbid, the sedimentation rate is slow, and the cohesive properties are unacceptable. Further, in Comparative Example 1-K, the addition amount of the coagulant mixture or the like with respect to the suspension was extremely small. On the other hand, in Comparative Example 1-L, the addition amount of the coagulant mixture or the like with respect to the suspension was extremely large, the supernatant was somewhat cloudy or turbid, the sedimentation rate was slow, and the aggregation property was unacceptable.

In Comparative Example 1-M, a cationic polymer coagulant was used, the supernatant was cloudy, the sedimentation rate was slow, and the cohesive properties were unacceptable.

In Comparative Example 1-N to Comparative Example 1-O, using Japanese Komatsu and Spinach instead Water-soluble viscous substances derived from plants, the supernatant is a bit turbid, the sedimentation rate is slow, and the cohesive properties are unacceptable.

As described above, the coagulant mixture according to Example 1 includes a polymer coagulant formed of an anionic polymer coagulant and/or a nonionic polymer coagulant, and a water-soluble viscous substance derived from a plant, and the polymer coagulant The nature is defined. Therefore, such a coagulant mixture has a higher property against condensed concentrated wastewater (waste liquid), and can be advantageously used in various fields such as wastewater treatment, semiconductor device manufacturing, electronic device manufacturing, electronic component manufacturing, electrical device manufacturing, Electrical component manufacturing, paper mills, water plants/sewers, fermentation industry, paper industry and civil engineering and civil engineering.

Although the embodiments of the present invention have been described on the basis of advantageous embodiments, the embodiments of the present invention are not limited to the examples and various modifications that can be made. In the examples, the plant material of the water-soluble viscous material derived from the plant is used alone. However, similar agglomeration properties can be achieved by using a raw material plant of a water-soluble viscous substance derived from the plant in a combined manner.

It should be noted that the present invention can also adopt the following configuration.

[1] <<Coagulant Mixture>> A coagulant mixture comprising: a polymer coagulant composed of an anionic polymer coagulant and/or a nonionic polymer coagulant; and a water-soluble viscous substance derived from a plant Wherein the value of (VC ₀ /VC ₁ ) is less than 15, wherein VC ₀ is a viscosity obtained by dissolving 0.5% by mass of the polymer coagulant in water having a conductivity of not more than 200 μS/cm, and VC ₁ The viscosity obtained by dissolving 0.5% by mass of the polymer coagulant in water having a conductivity of not more than 200 μS/cm and dissolving 2% by mass of sodium nitrate therein.

[2] The coagulant mixture according to [1], wherein the coagulant mixture has an angle of repose of not more than 60°.

[3] The coagulant mixture according to [1] or [2], wherein the mass ratio of the polymer coagulant/water-soluble viscous substance derived from the plant is from 20/1 to 1/20.

[4] The coagulant mixture according to any one of [1] to [3] wherein the water-soluble viscous substance derived from the plant comprises at least one selected from the group consisting of arrowhead, sorghum, jute, jute, and sunflower , red phoenix, banana, okra, Japanese yam, cactus, seaweed, sauerkraut spores and fruit sacs.

[5] The coagulant mixture according to any one of [1] to [3] wherein the water-soluble viscous substance derived from the plant comprises an allopolysaccharide.

[6] The coagulant mixture according to any one of [1] to [3] wherein the water-soluble viscous substance derived from the plant is glycoprotein.

[7] The coagulant mixture according to any one of [1] to [3] wherein the water-soluble viscous substance derived from the plant comprises a cohesive material.

[8] <<Coagulation method>> A coacervation method comprising: adding a coagulant mixture to a suspension, the coagulant mixture comprising: an aggregation consisting of an anionic polymer coagulant and/or a nonionic polymer coagulant a coagulant, and a water-soluble viscous substance derived from a plant, wherein (VC ₀ /VC ₁ ) has a value of less than 15, wherein VC ₀ is dissolved in a 0.5% by mass polymer coagulant at a conductivity of not more than 200 μS. Viscosity obtained in water of /cm, and VC ₁ is dissolved in 0.5% by mass of a polymer coagulant in water having a conductivity of not more than 200 μS/cm, and 2% by mass of sodium nitrate is dissolved therein The viscosity obtained at the time; and the particles in the suspension are coagulated and separated.

[9] The coagulation method according to [8], wherein the coagulant mixture has an angle of repose of not more than 60°.

[10] The coagulation method according to [8] or [9], wherein the mass ratio of the polymer coagulant/water-soluble viscous substance derived from the plant is from 20/1 to 1/20.

[11] The coagulation method according to any one of [8] to [10] wherein the suspension has a conductivity of not less than 500 μS/cm.

[12] The coagulation method according to any one of [8] to [11] wherein the water-soluble viscous substance derived from the plant comprises at least one selected from the group consisting of arrowhead, sorghum, jute, jute, and sunflower. Red Fengcai, banana, okra, Japanese yam, cactus, seaweed, spore leaves of wakame and the group of horsetail algae.

[13] The coagulation method according to any one of [8] to [11] wherein the water-soluble viscous substance derived from the plant comprises an allopolysaccharide.

[14] The coagulation method according to any one of [8] to [11] wherein the plant is derived from a water-soluble viscous substance glycoprotein.

[15] The coagulation method according to any one of [8] to [11] wherein the water-soluble viscous substance derived from the plant comprises a coacervate material.

The present invention contains subject matter related to that disclosed in Japanese Patent Application No. JP 2012-145018, filed on Jun. .

Those skilled in the art should understand that various modifications, combinations, sub-combinations and changes can be made within the scope of the scope of the claims and the equivalents thereof.

Claims (8)

A coagulant mixture comprising: a polymer coagulant formed from an anionic polymer coagulant and/or a nonionic polymer coagulant; and a water-soluble viscous material derived from a plant, comprising at least one selected from the group consisting of , a mixture of long jute, jute, jute, arborvitae, red phoenix, banana, okra, Japanese yam, cactus, seaweed, sauerkraut spores and stalks of sargasso, among which (VC ₀ /VC) ₁ ) The value is less than 15, wherein VC ₀ is a viscosity obtained by dissolving 0.5% by mass of a polymer coagulant in water having a conductivity of not more than 200 μS/cm, and VC ₁ is a polymer having 0.5% by mass. The coagulant is dissolved in water having a conductivity of not more than 200 μS/cm and a viscosity obtained by dissolving 2% by mass of sodium nitrate therein, wherein (the polymer coagulant/water-soluble viscous substance derived from the plant) The mass ratio is from 20/1 to 1/20. The coagulant mixture of claim 1 wherein the coagulant mixture has an angle of repose of no more than 60°. The coagulant mixture of claim 1, wherein the water-soluble viscous material derived from the plant comprises an isomalt polysaccharide. The coagulant mixture of claim 1, wherein the water-soluble viscous substance derived from the plant comprises a glycoprotein. The coagulant mixture of claim 1, wherein the water-soluble viscous substance derived from the plant comprises an coagulation aid, an inorganic coagulant or an organic coagulant. A coacervation method comprising: adding a coagulant mixture comprising: a polymer coagulant formed from an anionic polymer coagulant and/or a nonionic polymer coagulant, and a plant derived from a suspension a water-soluble viscous substance comprising at least one selected from the group consisting of scutellariae, sorghum, jute, jute, red phoenix, banana, okra, Japanese yam, cactus, seaweed, wakame spore leaf and fruit a material consisting of a group of S. cerevisiae, wherein (VC ₀ /VC ₁ ) has a value of less than 15, wherein VC ₀ is obtained by dissolving 0.5% by mass of a polymer coagulant in water having a conductivity of not more than 200 μS/cm. Viscosity, and VC ₁ is obtained by dissolving 0.5% by mass of a polymer coagulant in water having a conductivity of not more than 200 μS/cm, and dissolving 2% by mass of sodium nitrate therein; and allowing the suspension The particles in the liquid are agglomerated and separated, wherein the mass ratio of the polymer flocculating agent/water-soluble viscous substance derived from the plant is from 20/1 to 1/20. The coacervation method of claim 6, wherein the coagulant mixture has an angle of repose of no more than 60°. The coacervation method of claim 6, wherein the suspension has a conductivity of not less than 500 μS/cm.