阅读说明：本技术 水质改善用多孔体及其制造方法 (Porous body for improving water quality and method for producing same ) 是由 权丙铉 权赫大 崔秉邰 于 2020-03-11 设计创作，主要内容包括：本发明提供水质改善用多孔体及其制造方法,上述水质改善用多孔体包含含有金属氧化物的无机凝集剂、硅酸盐和发泡剂,上述多孔体的比重为0.5～1.5,气孔率为10～60％,比表面积为1～1,000㎡/g。本发明的多孔体由于以比重为0.5～1.5的范围制造而在水中逐渐下沉,因而能够有效去除沉入水中而浮游的污染物质。此外,上述多孔体由于具有一定以上的强度而不易被破坏,因而能够发挥更长时间的水质净化力。由此,能够提供播撒于污染区域的多孔体随时间的流逝还原成沙子而能够防止多孔体导致的二次污染,且播撒后无需再回收的水质改善用多孔体。(The present invention provides a porous body for water quality improvement, which comprises an inorganic coagulant containing a metal oxide, a silicate and a foaming agent, and which has a specific gravity of 0.5 to 1.5, a porosity of 10 to 60%, and a specific surface area of 1 to 1,000 square meters per gram, and a method for producing the same. The porous body of the present invention is manufactured in a specific gravity range of 0.5 to 1.5, and therefore, the porous body gradually sinks in water, and thus, pollutants floating by sinking in water can be effectively removed. Further, the porous body has a strength of not less than a certain level and is not easily broken, and thus can exhibit a water purification ability for a longer period of time. Thus, the porous body spread in the contaminated area is reduced to sand with the passage of time, so that secondary contamination by the porous body can be prevented, and the porous body for improving water quality does not need to be recovered after spreading.)

1. A porous body for improving water quality, which comprises an inorganic coagulant containing a metal oxide, a silicate and a foaming agent, and which has a specific gravity of 0.5 to 1.5, a porosity of 10 to 60% and a specific surface area of 1 to 1,000 square meters per gram.

2. The porous body for water quality improvement according to claim 1, wherein the silicate has a structure represented by the following chemical formula 1,

chemical formula 1

A₂O-nSiO₂

In the chemical formula 1, A is any one selected from sodium, potassium, lithium, rubidium and cesium, and n is an integer of 1-5.

3. The porous body for water quality improvement according to claim 1, wherein the foaming agent comprises a vinyl resin obtained by polymerizing one or more monomers selected from the group consisting of nitrostyrene, methoxystyrene, β -methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, methylsilylstyrene, vinylnaphthalene, vinylbiphenyl, vinylanthracene, vinyl chloride, vinylthiophene, vinylpyrrolidone, vinylpyridine, sulfonyloxystyrene, sodium styrenesulfonate, cyanostyrene, aminostyrene, ethylstyrene, β -ethylstyrene, carboxystyrene, chlorostyrene, phenylstyrene, and hydroxystyrene.

4. A porous body for water quality improvement according to claim 1, wherein the foaming agent further comprises any one or more weighting agents selected from copper sulfate, copper oxide, silver nitrate, boron oxide, zinc oxide, thorium dioxide, magnesium oxide, titanium dioxide, tricalcium phosphate, alumina, and graphite.

5. A porous body for water quality improvement according to claim 1, wherein the porous body contains one or more specific gravity adjusting agents selected from the group consisting of calcium chloride, magnesium chloride and lithium chloride.

6. A porous body for water quality improvement according to claim 5, wherein the specific gravity modifier further comprises one or more kinds of zeolites selected from the group consisting of aluminum phosphate-based zeolites, aluminum ferrophosphate-based zeolites, and silicoaluminophosphate-based zeolites.

7. A porous body for water quality improvement according to claim 1, wherein the surface of the porous body is coated with a coating agent comprising any one or more strains selected from the group consisting of Acinetobacter (Acinetobacter), Arthrobacter (Arthrobacter), Rhodococcus (Rhodococcus), Mycobacterium (Mycobacterium), Pseudomonas, Xanthobacter, Lactobacillus, Saccharomyces, Rhodopseudomonas (Rhodopseudomonas), Streptomyces, Pseudomonas (Streptomyces), Pseudomonas (Dimonas), Trypanosoma (Streptococcus), Korea (Korensis) and Pantoea (Pantoea).

8. The porous body for improving water quality according to claim 7, wherein the bacterial strain is a mixture of Arthrobacter, Flavobacterium and Pantoea.

9. A method for producing a porous body for improving water quality, which comprises:

a) a step of mixing an inorganic coagulant containing a metal oxide, a silicate, water glass, and a foaming agent to produce a molded body;

b) drying the molded body at 300-500 ℃ for 2-5 hours;

c) firing the dried molded body at 800-1,000 ℃ for 5-10 hours;

d) a step of coating the fired molded body with loess; and

e) a step of immersing the molded body in a coating agent containing a strain.

10. The method for producing a porous body for water quality improvement according to claim 9, wherein the molded body contains one or more strains selected from the group consisting of Arthrobacter, Flavobacterium, Lactobacillus, Saccharomyces, Rhodopseudomonas, Streptomyces, and Pantoea.

Technical Field

The present invention relates to a porous body for water quality improvement and a method for producing the same, and more particularly, to a porous body for water quality improvement, which is characterized by containing loess, silicate and a foaming agent, and has a specific gravity of 0.5 to 1.5, a porosity of 10 to 60%, and a specific surface area of 1 to 1,000 square meters per gram.

Background

In general, when domestic wastewater, livestock excrement, oil from oil tankers, or the like flows into a river, the water quality is adversely nourished, and floating algae, i.e., plant-based plankton, excessively proliferate to contaminate the water quality.

Plant plankton can cause water to be green, brown, red, etc. depending on its kind, and can cause death of fish or shellfish, etc. by blocking optical reaction to produce harmful substances, thereby causing huge destruction of rivers, fresh water, farms, etc.

On the other hand, in recent years, as a research trend for removal strategies after the appearance of green algae and red algae in various countries of the world, methods of killing red algae organisms by spreading chemical agents such as copper sulfate, substances extracted from marine plants, or radiating ultrasonic waves have been developed; a method of neutralizing the properties of red algae organisms using ozone; or a method of killing red algae using natural enemies, but the method of scattering loess is evaluated as the most economical method because of its low cost and relatively excellent effect.

In korea, from 1996, a countermeasure for preventing green algae and red algae by scattering loess in large quantities is established centering on local autonomous bodies and national aquaculture centers, but in reality, quantitative research on the timing and method of scattering loess is insufficient, and in reality, when red algae appear, pollutants are precipitated by scattering loess in large quantities to a polluted area using a shovel or water pressure.

However, in the case of scattering loess by the above method, a large amount of labor and time are required, and it is not only difficult to uniformly scatter loess over a wide pollution range, but also secondary pollution is caused in which the scattered loess precipitates in water together with harmful plankton to cause damage to fishes and shellfishes, etc. inhabiting the bottom.

In addition, when loess is scattered in a large amount, there are side effects such as respiratory disorders due to gill obstruction of fish caused by a momentary increase in suspended matter, death of fish and shellfish due to the precipitation of loess, and the need for troublesome operations to remove such a loess-deposited layer.

At present, drinking water is also troubled in purification due to water quality pollutants and green algae distributed in drinking water sources, and in order to purify water quality, a large amount of loess scattered from the bottom of a river has to be removed again.

In addition, when oil outflow accidents and other conditions occur in the oil tanker, the intermediate oil such as tar colloid sinks into the sea floor and spreads to a wider range while moving with the tide or the sea wave, thereby increasing the difficulty of treatment.

Therefore, it is actually necessary to develop a molded article which can easily decompose and purify the oil component in a state of adhering to the precipitated tar gum.

Disclosure of Invention

Problems to be solved

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for producing a molded article having pores by molding a composition containing loess, silicate and a foaming agent and then firing the molded article.

Another aspect of the present invention provides a porous body for water quality improvement, which can effectively remove oil floating by sinking into water.

Still another object of the present invention is to provide a porous body for water quality improvement, which is not easily broken because the molded body having pores formed therein has a strength of at least a certain level.

Still another object of the present invention is to provide a porous body for water quality improvement which does not need to be recovered after the spreading because the spread molded body is reduced to sand with the lapse of time.

Means for solving the problems

The present invention relates to a porous body for improving water quality and a method for producing the same.

The present invention relates to a porous body for improving water quality, which comprises an inorganic coagulant containing a metal oxide, a silicate and a foaming agent, and is characterized in that the porous body has a specific gravity of 0.5 to 1.5, a porosity of 10 to 60%, and a specific surface area of 1 to 1,000 square meters per gram.

In the present invention, the silicate has a structure represented by the following chemical formula 1.

[ chemical formula 1]

A₂O-nSiO₂

(in the chemical formula 1, A is any one selected from sodium, potassium, lithium, rubidium and cesium, and n is an integer of 1 to 5.)

In the present invention, the blowing agent is characterized by comprising a vinyl resin obtained by polymerizing one or more monomers selected from the group consisting of nitrostyrene, methoxystyrene, β -methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, methylsilylstyrene, vinylnaphthalene, vinylbiphenyl, vinylanthracene, vinyl chloride, vinylthiophene, vinylpyrrolidone, vinylpyridine, sulfonyloxystyrene, sodium styrenesulfonate, cyanostyrene, aminostyrene, ethylstyrene, β -ethylstyrene, carboxystyrene, chlorostyrene, phenylstyrene and hydroxystyrene,

the above blowing agent is characterized by further comprising any one or more weighting agents selected from copper sulfate, copper oxide, silver nitrate, boron oxide, zinc oxide, thorium dioxide, magnesium oxide, titanium dioxide, tricalcium phosphate, alumina, and graphite.

The porous body is characterized by containing one or more specific gravity adjusting agents selected from the group consisting of calcium chloride, magnesium chloride and lithium chloride, and more specifically, the specific gravity adjusting agents are characterized by further containing one or more zeolites selected from the group consisting of aluminum phosphate zeolites, aluminum ferrophosphate zeolites and silicoaluminophosphate zeolites.

The porous body is characterized in that the surface is coated with a coating agent containing one or more strains selected from the group consisting of Acinetobacter (Acinetobacter), Arthrobacter (Arthrobacter), Rhodococcus (Rhodococcus), Mycobacterium (Mycobacterium), Pseudomonas (Pseudomonas), Xanthobacter (Xanthobacter), Lactobacillus (Lactobacillus), Saccharomyces (Saccharomyces), Rhodopseudomonas (Rhodopseudomonas), Streptomyces (Streptomyces), Pseudomonas (Dimonas), Trypanosoma (Strepidulis), Korea (Koreansis) and Pantoea (Pantoea), and more particularly, the strains are characterized in that they are a mixture of Acinetobacter, Xanthobacter and Pantoea.

Another aspect of the present invention relates to a method for producing a porous body for water quality improvement, including:

a) a step of mixing an inorganic coagulant containing a metal oxide, a silicate, water glass, and a foaming agent to produce a molded body;

b) drying the molded body at 300-500 ℃ for 2-5 hours;

c) firing the dried molded body at 800 to 1,000 ℃ for 5 to 10 hours;

d) coating the fired molded body with viscous loess having a desired specific gravity; and

e) and immersing the molded article in a coating agent containing a strain.

In the above production method, the molded article may contain one or more strains selected from the group consisting of Arthrobacter, Flavobacterium, Lactobacillus, Saccharomyces, Rhodopseudomonas, Streptomyces and Pantoea.

Effects of the invention

The porous body of the present invention is manufactured in a specific gravity range of 0.5 to 1.5, and therefore, the porous body gradually sinks in water, and thus, pollutants floating by sinking in water can be effectively removed.

Further, the porous body has a strength of not less than a certain level and is not easily broken, and thus can exhibit a water purification ability for a longer period of time.

Thus, the porous body spread in the contaminated area is reduced to sand with the passage of time, so that secondary contamination by the porous body can be prevented, and the porous body for improving water quality does not need to be recovered after spreading.

Detailed Description

The porous body for improving water quality of the present invention will be described in detail below with reference to specific examples. The specific examples described below are provided to fully convey the concept of the present invention to those skilled in the art.

Therefore, the present invention is not limited to the specific examples provided below, but may be embodied in other forms.

In this case, unless defined otherwise, technical and scientific terms used herein have meanings commonly understood by those skilled in the art to which the present invention pertains, and in the following description, well-known functions and configurations that may unnecessarily obscure the gist of the present invention are omitted.

Furthermore, as used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

In describing the components of the present invention, terms such as first, second, A, B, (a), (b), and the like may be used. Such terms are only used to distinguish one component from another component, and do not limit the nature, order, and the like of the corresponding components by the terms. When it is stated that a certain component is "connected", "coupled" or "in contact with" another component, it is to be understood that the other component may be "connected", "coupled" or "in contact" between the components, although the component may be directly connected or in contact with the other component.

The porous body for improving water quality of the present invention will be described mainly in terms of the production method, and can be produced by the following steps,

a) a step of mixing loess, silicate, water glass and a foaming agent to produce a molded body;

b) drying the molded body at 300-500 ℃ for 2-5 hours;

c) firing the dried molded body at 800 to 1,000 ℃ for 5 to 10 hours;

d) coating the fired molded body with viscous loess having a desired specific gravity; and

e) and immersing the molded article in a coating agent containing a strain.

In the present invention, the step a) is a step of producing a molded article by mixing an inorganic coagulant containing a metal oxide, a silicate and a foaming agent, and a solvent such as water and ethanol may be mixed with the composition to further improve the processability.

In general, the phenomenon of green algae occurring in summer occurs mainly in river or lake water having a very low flow rate, which makes the water appear dark green. Among the algae (algae) related thereto, blue-green algae (blue-green algae) mainly appearing in early summer to autumn causes water bloom to cause water pollution problems such as reduction of dissolved oxygen, death of fish resources, generation of odor, water purification failure, and the like. Moreover, it also releases liver and nerve toxins such as microcystin or anabaena toxin (anatoxin), which causes serious problems in public health. 4 harmful blue algae (NIER, 2016) such as Microcystis, Anabaena, Oscillatoria, Aphanizomenon, have been identified by Korean national academy of environmental sciences.

In the present invention, the inorganic coagulant plays the most important role in solving the above-described phenomenon of green algae, and plays a role in preventing and controlling green algae by removing nutrient salts present in the water environment through aggregation of plankton, co-precipitation by adsorption to colloidal particles, or physical or chemical adsorption.

In the present invention, the metal oxide is a main component constituting soil, and the content thereof may vary depending on the kind of soil, and may include Silica (SiO) selected from the group consisting of₂) Alumina (Al)₂O₃) Iron (III) oxide (III)Fe₂O₃) Iron (II) oxide (FeO), titanium dioxide (TiO)₂) Any one or more of manganese oxide (MnO), lime (CaO), magnesium oxide (MgO), and the like.

Among them, preferred examples of the inorganic coagulant containing the metal oxide include loess. The loess has a large amount of calcium carbonate, and exhibits stickiness when it is in contact with water due to the calcium carbonate, and is easily molded. Further, the composition contains a component called illite, and thus has an effect of adsorbing and decomposing pollutants.

Further, the loess has a multi-layered structure having a large number of spaces due to a honeycomb structure having a large surface, and the spaces have a function of adsorbing plankton, nutritive salts, toxins released from other green algae, and the like.

In the present invention, the loess as a yellow to reddish brown weathered soil or weathered deposit formed by chemical weathering of rock means a deposit composed of soil particles having a particle diameter of 0.002 to 0.02 mm in a majority. The loess is determined by the kind of the contained mineral, and examples of the mineral include kaolinite, halloysite, illite, vermiculite, chlorite, and the like, and the present invention is not limited to such kind of mineral, and any kind known as loess can be used.

In the present invention, the loess is preferably added in an amount of 60 to 80 parts by weight based on 100 parts by weight of the solvent when the loess is mixed with the solvent. In the above range, adsorption of organic substances and the like which are inherent characteristics of loess and mechanical strength of the porous body itself can be maintained, and therefore, such a range is preferable.

In the present invention, the silicate is a binder binding the loess particles together, has a low melting point characteristic although it varies depending on the components, and after being melted by heating, it is bound to the loess and cooled to provide a porous body with a certain strength, and preferably, the silicate may have a structure of the following chemical formula 1.

[ chemical formula 1]

A₂O-nSiO₂

(in the chemical formula 1, A is one selected from sodium, potassium, lithium, rubidium and cesium, and n is an integer of 1 to 5.)

The silicate as described above exhibits strong basicity when reacted with an acid or the like, and thus initiates a violent reaction. By forming a glass phase by such a reaction and arranging the structure-forming basic oxygen stereoscopically, the mechanical properties of the porous body can be increased.

The silicate is preferably added in the form of water glass. Generally, the water glass can be obtained by treating a mixture of silica sand and soda ash, which is melted at 1,300 to 1,500 ℃, in a high-pressure steam kettle. Since carbon dioxide is absorbed in air and a gel-like silicic acid is precipitated, the adhesive strength is strong.

The water glass is strongly alkaline, and the precipitate generated by acid neutralization is silica gel after drying, and can be used as a drying agent. In addition, water glass is formed by evaporating water from water glass or heating anhydrous water glass and a small amount of water. Such water-containing glass can be used as a raw material for adhesives, cements, refractory cements, and the like.

Water glass has a tetrahedral structure common to many different forms of silica or crystalline silica, having a silicate tetrahedral monomolecular form or a high molecular form sharing oxygen in a Si-O-Si bridge (bridge) manner. However, the overall structure of the water-soluble sodium silicate is Na as a common cation₂O and SiO₄Irregular arrangement of molecules. With such a structure, the water glass exhibits a characteristic of swelling during swelling, and foaming occurs. Such foaming brings about an effect of adsorbing organic substances, green algae, toxic components, oil, and the like by forming pores in the molded article when the molded article is mixed with loess.

In the present invention, the water glass is preferably added in an amount of 20 to 40 parts by weight based on 100 parts by weight of the solvent. If the amount is less than the above range, the mechanical properties of the porous body are reduced due to the decrease in the adhesive properties, and if the amount is more than 40 parts by weight, the specific gravity of the porous body is difficult to adjust due to excessive foaming.

In the present invention, the foaming agent may be a blowing agent which causes the porous body to form pores in a manner different from the water glass, and which generates gas by a chemical reaction, or may be a blowing agent which is mixed with the loess or silicate in a particle form and then removed at the time of firing to form pores.

In the present invention, examples of the blowing agent include vinyl resins obtained by polymerizing monomers such as nitrostyrene, methoxystyrene, β -methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, methylsilylstyrene, vinylnaphthalene, vinylbiphenyl, vinylanthracene, vinyl chloride, vinylthiophene, vinylpyrrolidone, vinylpyridine, sulfonyloxystyrene (sulfoxy styrene), sodium styrenesulfonate, cyanostyrene, aminostyrene, ethylstyrene, β -ethylstyrene, carboxystyrene, chlorostyrene, phenylstyrene, and hydroxystyrene, and organic solvents such as alcohols and esters may be further added.

The blowing agent may further contain a swelling agent such as n-hexane, n-heptane, methylcyclohexanol, 1-butanol, 2-butanol, cyclopentanone, cyclohexanone, cyclohexanol, cyclohexane, 2-ethyl-1-hexanol, or ethylbenzene when the vinyl resin is crosslinked, and these swelling agents may be used in combination with an organic solvent.

Further, the foaming agent may further contain a weighting agent for adjusting the specific gravity of the porous body, if necessary. The weighting agent contains, as a metal compound, a metal such as copper, silver, boron, zinc, or magnesium, which has an inhibitory activity against microorganisms or strains, and has an additional bactericidal effect in addition to the effect of increasing the specific gravity of the porous body.

Examples of the weighting agent include copper sulfate, copper oxide, silver nitrate, boron oxide, zinc oxide, thorium dioxide, magnesium oxide, titanium dioxide, tricalcium phosphate, alumina, graphite, and the like, and these may be used alone or in combination of two or more.

The weighting agent is preferably used together with the foaming agent, and the amount of the foaming agent and the weighting agent is not limited, but the foaming agent is preferably added in an amount of 1 to 5 parts by weight based on 100 parts by weight of the solvent, and the weighting agent is preferably used in an amount capable of satisfying both the specific gravity adjustment and the foaming effect when mixed in a state where 10 to 20% by weight of the foaming agent is replaced.

In the present invention, the solvent is a liquid for mixing the loess, silicate, foaming agent, etc., and the kind thereof is not limited, and water, or alcohols such as methanol, 1-butanol, 2-butanol, ethanol, isobutanol, isopropanol, isoamyl alcohol, propane-1-ol, propane-2-ol, etc. may be used; dimethyl ether, ethyl ether, tetrahydrofuran as ethers; as ketones, methyl butyl ketone, methyl ethyl ketone, methyl isobutyl ketone, methyl isopropyl ketone, acetone, and the like, and in addition thereto, glycol ethers, aldehydes, esters, or a mixed solvent thereof may be used.

In the present invention, the loess, silicate, foaming agent, etc. may be mixed in the step a) and then molded into a spherical molded body. The molding method is not limited in the present invention, and a mode of putting into a die or cutting after spinning may be applied, and the particle size is not limited, and is preferably 1 to 30 mm.

In the method of the present invention, one or more specific gravity adjusting agents may be further added in the step a) in order to allow the porous body to be slowly sunk.

In general, in the case of loess, it is scattered in the form of particles when green algae appear as described above, but in the case of scattering loess as described above by a general method, damage of benthic organisms due to the settled loess occurs, and the like, and secondary ecosystem disturbance is concerned, and in the case of scattering a large amount of loess, deep pollution is induced, and plankton once removed after scattering is sometimes revived again after a certain time, and therefore it is important to keep the removal time of plankton by floating loess on the water surface for a certain time or more.

In order to solve the above-mentioned problems, the present invention is directed to a water purification method for a water purification apparatus, which comprises a porous body having pores and pores, a water-absorbing component, and a water-purifying agent, wherein the water-absorbing component is added to the porous body, the water-absorbing component absorbs water permeating into the pores of the porous body to increase a specific gravity, and the porous body is allowed to slowly sink due to the increased specific gravity, thereby ensuring a time for removing harmful components such as green algae, oil, and toxins formed on the surface of the porous body.

In the present invention, the specific gravity adjusting agent may be one or more metal chlorides, and preferably may be one or more selected from the group consisting of calcium chloride, magnesium chloride and lithium chloride. The metal chloride is easily dissolved in a liquid state by reacting with water because of its high deliquescence, and increases the specific gravity as compared with the original material. This increases the specific gravity of the entire porous body, and the porous body sinks into water with the lapse of time.

However, since the specific gravity adjusting agent is dissolved and flows out of the porous body when the specific gravity adjusting agent is liquefied due to the high deliquescence as described above, in order to solve this problem, it is preferable to impregnate at least one kind of zeolite such as an aluminum phosphate zeolite, an aluminum ferrophosphate zeolite, or a silicoaluminophosphate zeolite into a solid. In particular, the zeolite has a specific gravity of at least a certain value, and pores are formed on the surface thereof to facilitate impregnation with the metal chloride, and the metal chloride is combined with the hygroscopicity of the metal chloride, thereby providing a synergistic effect.

The specific gravity adjusting agent is preferably formed inside the porous body rather than on the surface thereof, and more preferably, a zeolite impregnated with the metal chloride is used as an inner core (core), and then a mixture of loess, silicate, a foaming agent, and the like is applied to the surface of the zeolite to form an outer layer (skin), so that a migration time for water to migrate into the interior of the porous body for a certain period or longer can be secured, thereby preventing a rapid increase in specific gravity and securing mechanical properties of the porous body.

The amount of the specific gravity adjusting agent added is not limited, and when the specific gravity adjusting agent is added in the form of a core, the specific gravity and mechanical properties can be satisfied when the specific gravity adjusting agent is added so as to be 5 to 15 vol% in the entire porous body.

When a molded article is produced as described above, it may be dried at a certain temperature before firing. The drying is performed to remove moisture in the molded article, particularly moisture adsorbed in pores, to maintain a constant specific gravity and to prevent deterioration of physical properties such as expansion, breakage, and cracking due to rapid heating of the molded article.

In the present invention, the step b) is preferably carried out by charging the molded article into a firing furnace, a dryer or the like at 300 to 500 ℃ for 2 to 5 hours. If the amount of the organic compound is less than the above range, the porous body may be broken during firing due to insufficient drying time, and if the amount of the organic compound is more than the above range, the organic compound may be degraded before the porous body is stabilized, and the mechanical properties may be deteriorated.

Then, the dried molded body is fired at 800 to 1,000 ℃ for 5 to 10 hours to complete the porous body. When firing is carried out in the above range, the foaming agent is degraded and gasified inside to form pores, and the silicate such as water glass is also melted and recrystallized to be physically bonded to the loess, thereby producing a porous body maintaining a fracture strength of not less than a certain level.

Next, after the produced porous body is cooled to room temperature and stabilized, loess may be coated on the surface of the porous body to adjust the specific gravity of the fired porous body.

The loess is a natural state of red due to silica containing hydrous iron oxide and anhydrous iron oxide, and contains SiO in large amount₂、Al₂O₃、Fe₂O₃、Na₂O、CaO、TiO₂And MgO and the like, which can exert beneficial effects on human bodies. Such loess has various environmental properties such as decomposability, self-cleaning ability, and far infrared ray, antibacterial, insect-repelling, air-purifying and deodorizing inherent to loess.

The loess may have a specific gravity increased or decreased by adjusting the content of iron oxide according to the specific gravity of the porous body. For example, silicon dioxide (SiO)₂) Has a specific gravity of 2.21, 3.3 for calcium oxide (CaO) and 3.4 to 4 for aluminum oxide, while iron oxide has a specific gravity of 4.5 to 5.2, which is much higher than that of other metal oxides, and thus the specific gravity can be increased or decreased by adjusting the content of iron oxide. In this case, the content of the iron oxide in the loess is 2 to 5% by weight, and therefore, it is preferable to determine the amount of the iron oxide added within the above range.

The loess preferably has a specific gravity increased or decreased according to the purpose of use. For example, in the case of removing oil, in order to most quickly adsorb a large amount of oil floating on the water surface, the porous body having the oil adsorbed thereon rapidly sinks from the surface, and it is preferable to increase the specific gravity of loess. This is because the oil adsorbed on the porous body can be induced to decompose by bacteria in water, and when the porous body floats on the water surface for a long time, the gas exchange is hindered and the light is blocked, which may adversely affect the ecosystem.

In contrast, green algae or red algae are floating algae, and therefore it is preferable to reduce the specific gravity of the loess so that the loess stays on the water surface for as long as possible to adsorb the algae.

After the surface of the porous body is coated with loess as described above, the coated loess is dried at normal temperature to be hardened. At this time, if it is irradiated with sunlight, the coated loess is preferably dried in the shade because the coated loess is cracked, and the drying time is not limited, and it is preferably dried sufficiently at an appropriate humidity to completely remove moisture.

If the porous body is completed as described above, the surface of the porous body may be coated with a coating agent.

The coating agent is a mixture of a bacterial strain capable of digesting, absorbing and removing harmful components such as green algae, red algae, toxins and other oils and a polymer forming a coating film on the surface of the porous body, and may be a coating agent in which one or more bacterial strains are coated on one or more cellulose polymers.

The cellulose polymer is a natural polymer obtained from cotton, wood, grain, or the like, and preferably may contain water-soluble cellulose or modified starch obtained by reacting one or more ethers.

The natural cellulose can provide nutrients into which the bacterial strain can be decomposed and solubilized by forming a coating film on the surface of the porous body, and can maintain the viscosity of the coating agent. The modified starch is generally used as a gelling agent, a coating agent, or the like, and can function to fix a strain, supply nutrients, or the like.

More preferably, the coating agent is preferably modified starch. This is because the time for dissolving and emulsifying in water can be easily adjusted, and thus the strains can be prevented from dispersing and running off into water. In addition, nutrients such as sugars can be effectively supplied to the strain.

In the present invention, the cellulose polymer is preferably added in an amount of 10 to 50 parts by weight based on 100 parts by weight of the solvent. If the viscosity of the coating agent is less than the above range, the viscosity of the coating agent may not be sufficiently maintained, and the thickness of the coating agent may be reduced.

The above-mentioned strains are used for adsorbing, digesting and removing algae such as green algae and red algae and other suspended matters such as oil and toxins, and examples thereof include acinetobacter, arthrobacter, rhodococcus, mycobacterium, pseudomonas, xanthobacter, lactobacillus, saccharomyces, rhodopseudomonas, streptomyces and pantoea.

The strain may be different depending on the place of introduction and the purpose of the porous body to be produced. For example, when used for wastewater purification, tar colloid adsorption, or the like, it is preferable to mix acinetobacter, arthrobacter, rhodococcus, mycobacterium, pseudomonas, or the like, and when used for green algae removal, it is preferable to mix arthrobacter, xanthobacter, monads, pseudonymphaea, korean, or the like. In addition, for the digestion of crude oil and the like, Arthrobacter and Pantoea for removing toxins and the like may be further added.

In the present invention, more preferably, the above-mentioned strains are mixed with Arthrobacter, Flavobacterium and Pantoea. The Arthrobacter strains can effectively remove pollution sources such as crude oil and the like, and the flavobacterium strains have the strongest algae removal capability and show high algae removal capability in all growth steps of algae. Further, Pantoea can remove neurotoxicity or hepatotoxicity released from the above-mentioned algae.

The above-mentioned strains may be added in an amount of 1 to 5 parts by weight per 100 parts by weight of the solvent, and in the case where one or more of the above-mentioned strains are added, particularly in the case where Arthrobacter, Flavobacterium and Pantoea are mixed, the addition amount of each strain is preferably 0.5 to 1 part by weight.

In addition, the coating agent may further contain one or more aromatic oils in order to enhance the supply of nutrients to the strains mixed together and to remove liver toxicity from the algae together with the Pantoea.

The above-mentioned aromatic oil is extracted from fruits, leaves, stems, etc. of plants by steam distillation, hot water distillation, oil adsorption, etc., and examples thereof may be one or more selected from citronellal, geranyl acetate, citronellyl acetate, citronellol, cryptopine, linalool, cumic alcohol, pelargonic acid, naringin, geranial, piperonyl alcohol, etc.

As the above-mentioned aromatic oil, a mixture of linalool and naringin may be preferably used. The linalool increases the activity of the Pantoea strain to actively remove toxins from the strain, and naringin not only increases the activity of the strain and provides nutrients but also inhibits apoptosis due to hepatotoxicity.

The content of the aromatic oil is preferably 0.1 to 1 part by weight in 100 parts by weight of the solvent, and in the case of mixing naringin and linalool, the effect can be maximized when mixing them in a ratio of 1:1 to 2 by weight, and thus it is preferable.

The solvent is used for dissolving or mixing the above strains, cellulose polymers, aromatic oils, etc., and water or a mixture of water and alcohols may be used.

In the step e), it is preferable that the above components are stirred and mixed to prepare a coating agent, and then the fired molded article is impregnated with the coating agent and then dried. In this case, the coating conditions are not limited in the present invention, and the coating can be completed by immersing the molded article at room temperature (20 to 25 ℃) for about 30 minutes, taking it out, and drying it at 30 to 40 ℃ until a coating film is formed on the surface of the molded article.

The present invention includes the porous body for improving water quality produced as described above. The porous body for improving water quality may have a specific gravity of 0.5 to 1.5, a porosity of 10 to 60%, and a specific surface area of 1 to 1,000 square meters per gram, and may absorb harmful components such as green algae, red algae, oil bodies, and other toxins in a river or sea water and then gradually sink in water due to the above-mentioned characteristics, thereby effectively removing pollutants. In addition, the porous body that sinks as above contains loess, silicate, etc. as natural components, so that it is possible to prevent secondary pollution due to the porous body by reducing to sand with the lapse of time, and it is economical without labor input such as recycling after use.

The present invention will be described in more detail below with reference to examples and comparative examples. However, the following examples and comparative examples are merely illustrative examples for further describing the present invention, and the present invention is not limited to the following examples and comparative examples.

(example 1)

First, in order to produce a molded article, 70 parts by weight of loess, 30 parts by weight of water-soluble sodium silicate, and 3 parts by weight of a nitrostyrene polymer (weight average molecular weight 3,000) as a foaming agent were added to 100 parts by weight of water, and 10% by weight (0.3 parts by weight) of the foaming agent was replaced with copper sulfate. The molded body composition was mixed and molded into a sphere having a diameter of 15 mm, and then the sphere was put into a drying furnace, dried at 350 ℃ for 3 hours, taken out, and cooled to normal temperature. Then, the molded article was again put into a heat treatment furnace, fired at 900 ℃ for 8 hours, and then coated with loess on the surface of the molded article and dried to complete the molded article.

In addition, 20 parts by weight of modified starch (starch acetate) and 3 parts by weight of a culture solution in which a strain (Bacillus subtilis) was cultured were mixed and stirred in 100 parts by weight of a solvent in which water and ethanol were mixed at a weight ratio of 1: 1. After the viscosity of the coating liquid was increased, the molded article was put into the coating liquid, left to stand for 30 minutes, taken out, and dried at 35 ℃ for 2 hours, thereby producing a porous body for water quality improvement.

(example 2)

In the production of the porous body in example 1, a specific gravity adjusting agent was further added. Specifically, a zeolite having a diameter of 1.5 mm was put into a solution in which calcium chloride and water were mixed at a weight ratio of 1: 2. Then, after sufficiently stirring, the mixture was put into an oven at 200 ℃ and completely dried for 24 hours. The molded body composition produced in example 1 was applied to the surface of the dried specific gravity adjusting agent so as to be a spherical shape of 15 mm. Otherwise, the porous body for water quality improvement was produced by the same method.

(example 3)

In the production of the porous material in example 2, a water quality improving porous material was produced in the same manner as in the above example except that 1 part by weight of each of a coating liquid obtained by mixing culture liquids of Arthrobacter chlorophenol (Arthrobacter chlorophenoolicus), Xanthobacter autotrophicum (xanthobacter autotrophicus) and Pantoea agglomerans (Pantoea agglomerans) was used as the strain.

(example 4)

A porous body for water quality improvement was produced in the same manner as in example 3, except that 0.5 parts by weight of linalool was further added as the fragrant oil to the coating liquid when the porous body was produced.

(example 5)

A porous body for water quality improvement was produced in the same manner as in example 4, except that 0.5 part by weight of aromatic oil in which linalool and naringin were mixed in a weight ratio of 1.5: 1 was added.

(Experimental example)

From the Oncore of the university of south Korea, 30kg was obtained according to each example, and divided into half, and 5,000ppm of crude oil was charged into half. The hydrogen ion concentration, dissolved oxygen amount, total phosphorus amount, total nitrogen amount, and crude oil amount of the samples into which crude oil was charged and the samples into which crude oil was not charged were measured, and 300 samples each produced in examples 1 to 5 were charged into the samples, and then allowed to stand for 30 days. After standing still, the hydrogen ion concentration, dissolved oxygen amount, total phosphorus amount, total nitrogen amount, and crude oil amount were measured, and the amounts of change thereof are described in table 1 below. Subsequently, after further standing, a fish toxicity test was carried out using the sample (OECD TG 203, medaka 10 strips, LC50 was measured after 96 hours).

[ Table 1]