KR100405474B1 - adsorbent for water treatment - Google Patents

Abstract

The present invention relates to an adsorbent for water treatment, which has a certain strength and adjusts specific gravity according to the mixing ratio to freely adjust the floating time and to form various forms, thereby improving the adsorption capacity of contaminants. The present invention is a shell powder made of porous and having a size of 50 to 200 mesh by firing at high temperature and pulverized; Porous natural inorganic powder consisting of at least any one of ocher, montmorillonite, illite, bentonite, elvan, or zeolite, and fired and dried at high temperature to have a size of 50 to 200 mesh; And a carbon compound having a size of 50 to 200 mesh and comprising any one of porous charcoal or activated carbon; the adsorbent for water treatment comprising a main component thereof. It is composed of 10 to 36wt.% Calcined at 500 to 1500 ℃, natural inorganic material is composed of 42 to 85wt.% Calcined and dried at 400 to 1000 ℃, carbon compounds are mixed in powder form of 5 to 15wt.% 5 to 15 wt% of water and a high molecular material such as chitosan are mixed in the mixture to prepare a viscous mixture, followed by spray drying to form a granular powder by hydration of a shell or to the physical mixture. 5 to 15 wt% of water is mixed to prepare a viscous mixture, and then a molded article having a certain shape is dried and dried. It is to consist of a molded product by the reaction. Therefore, it has various strengths, specific gravity control and various forms, and the adsorption performance is improved.

Description

Adsorbent for Water Treatment

The present invention relates to an adsorbent for water treatment. More specifically, the adsorbent for water treatment improves the adsorption capacity of contaminants by controlling the specific gravity according to the mixing ratio and allowing the floating time to be freely formed in various forms. And to a method for producing the same.

In general, various sewage or factory wastewaters are introduced into rivers, lakes, and seas, causing serious water pollution. Therefore, in order to maintain natural purification capability, the pollutants must be removed and discharged to some extent before discharge. By properly removing contaminants, it is easy to use as drinking water and can maintain a natural ecological environment. However, despite various forms of water treatment, various algae are generated by eutrophication in existing rivers and lakes, and red tide occurs every year in the southern sea where the water temperature is high in summer. This is an urgent need for a new water treatment model because there are many problems in efficiency and economic efficiency of existing water treatment technologies and methods.

Various kinds of water treatment methods for removing contaminants have been developed at present, but in terms of economics and efficiency, most of them use adsorbents to adsorb and remove contaminants. In the water treatment method using such an adsorbent, porous zeolite or bentonite is used as the adsorbent for waste water treatment or ocher is mainly used. However, the adsorbent as described above is used in powder form, and because the adsorption rate of the material itself is slow and the amount of adsorption per unit volume is somewhat small, an excess amount must be used. However, when the excessive amount of the adsorbent itself particles are suspended in the colloidal form to increase the turbidity, thereby reducing the transmittance of light and the supply of dissolved oxygen in the water there is a problem that secondary pollution occurs.

Recently, shells discarded by using environmental friendliness and excellent adsorption performance have been used as adsorbents. However, in the case of using only these shells, especially oyster shells as an adsorbent, the adsorption rate is high, but after the adsorption of contaminants and the like, the sedimentation rate is low, causing floating for a long time to cause the secondary problem as described above.

Above all, the adsorbent is used as a powder to perform the water treatment only on the surface of the water, it is impossible to remove the contaminants present in a certain depth in the water. Therefore, there is a problem that can not properly handle the contaminants present in the water as well as the surface of the water.

Therefore, the present invention is to solve the above problems, the adsorption performance is improved, and the adsorbent for water treatment and the method for producing the same does not cause secondary pollution by forming a separate colloidal particles affecting turbidity during water treatment The purpose is to provide.

In addition, the present invention is to adjust the specific gravity of the adsorbent in various ways to adjust the suspended time from the surface to the precipitation during the water treatment, so that the water treatment according to the degree of pollution can be made even without a separate amount and the preparation method for the water treatment There is another purpose to provide.

In addition, the present invention is to provide a water treatment adsorbent and a method for manufacturing the same so that various shapes can be changed according to the molding method of the adsorbent to maintain a suitable form according to the type of pollution source such as river, lake or sea. have.

1-process chart of the adsorbent for water treatment according to the present invention.

The present invention for achieving the above object, the plastic working at a high temperature and pulverized to have a size of 50 to 200 mesh, 10 to 36wt.% Shell powder made of porous; It is made of at least one of ocher, montmorillonite, illite, bentonite, elvan or zeolite, and fired and dried at high temperature to pulverize, and the porous natural inorganic powder having a size of 50 to 200 mesh is 42 to 85 wt.%; And it has a technical point to provide an adsorbent for water treatment having a size of 50 to 200 mesh, consisting of 5 to 15 wt.% Of a carbon compound comprising any one of porous charcoal or activated carbon.

Preferably, the shell is composed of 10 to 36 wt.% Calcined at 500 to 1500 ° C, the natural inorganic material is composed of 42 to 85 wt.% Calcined and dried at 400 to 1000 ° C, and the carbon compound is 5 in powder form. To 15wt.%. More preferably, the shell powder, the porous natural inorganic material and the carbon compound are made of a mixture by physical mixing, or 5 to 15 wt% of water is mixed with the physical mixture to prepare a viscous mixture, followed by spray drying to hydrate the shell. Made of granular powder or mixed with 5 to 15wt% of water in the physical mixture to form a viscous mixture, and then formed into a molded body by the hydration reaction of the shell as it forms a molded product having a predetermined shape and is dried. Here, the shell is used as an inorganic hardener, and when it is commercialized as an adsorbent, it has the characteristics of adsorption and ion exchange function and alkalinization of water, and the natural inorganics make up the adsorbent body, and the carbon compound provides As used, the composition weight ratio of natural It consists of relatively a lot more by weight of the compound.

On the other hand, according to the second aspect of the present invention, it provides a water treatment adsorbent comprising 1 to 15wt% of the polymer material dissolved in water and present in the aqueous phase. The polymer material is made of at least one of natural polymers such as chitosan and cellulose or synthetic polymers such as polyvinyl alcohol and polyethylene oxide. The adsorbent is a mixture of shell powder, natural inorganic and carbon compounds, and a polymer material in an aqueous solution, a viscous mixture is prepared by adding 1 to 10 wt% of water, and then formed into a granular powder by spray drying. , A shell powder, a natural inorganic material and a physical mixture of a carbon compound and a polymer material in an aqueous solution, 1 to 10wt% of water is added to prepare a viscous mixture, and then a molded article having a predetermined shape and dried to form To be done.

Hereinafter, the present invention having the characteristics as described above will be described in more detail with reference to the drawings and various embodiments. And shown in the following examples are not intended to limit the present invention to any particular scope, it will be apparent to those skilled in the art that various applications within the technical scope of the present invention.

First, Figure 1 is a view showing a manufacturing method of the adsorbent for water treatment according to the present invention. As shown, the present invention has a specific gravity control role by binding and adsorbing the natural inorganic and shell powder greatly improved adsorption properties, and the adsorption station consisting mainly of carbon compounds composed of charcoal or activated carbon and the adsorption station. It consists mainly of agglomerates.

First, the adsorption station will be described. Adsorption stations are the main components for adsorbing various pollutants in water treatment, including raw or raw materials consisting of natural minerals such as loess, montmorillonite, illite, bentonite, ganbanite and zeolite, and plastic processing of shells, shells and charcoal. Uses carbon compounds such as carbon. Such natural inorganic materials and shells are used in the prior art, but if used as they are, causing secondary pollution as described above, plastic processing is used to have a structure having an appropriate size.

First, in order to prepare the shell powder among the raw materials of the water treatment agent according to the present invention, the powder having a range of about 50 to 200 mesh by washing and pulverizing the shell, preferably oyster shell, and then baking and grinding at a temperature range of 500 to 1200 ° C. To prepare. The prepared oyster shell powder is porous and the specific surface area is quite large, the chemical composition is as shown in Table 1 below. Oyster shell powder has a strong alkalinity, has a high specific surface area and an excellent adsorption capacity, and has a function as an inorganic hardener.

As shown in the table, the ignition loss amounts to 46.9%. This is because calcium carbonate (CaCO3), which is a major component of the shell, is changed to quicklime (CaO) by plastic working, and carbon dioxide (CO2) is evaporated, thereby reforming to more porosity, and also a large number of charges are distributed. Therefore, the adsorption performance can be improved by the charge distribution of the porous structure and the molecular surface. In addition, the quicklime component has a function as an inorganic hardener because it reacts with water. Therefore, even when sprinkled in powder form, it becomes swelled and does not exist in a colloidal state, thereby preventing secondary contamination due to an increase in turbidity, and solidifying by hydration reaction as water is added in a mixed state with other components. It is possible to manufacture a molded article having a certain shape as well as to control the specific gravity of the granular powder.

Second, natural minerals used as the main raw materials are mainly selected from secondary clays such as ocher and montmorillonite, bentonite or illite or elvan or zeolite, raw materials or raw materials such as clay, zeolite and zeolite. A powder having a range of about 200 mesh is prepared. The natural inorganic powders produced by the plastic working process also have excellent adsorption capacity due to the high specific surface area as a porous material, exhibit alkalinity, and have a large distribution of oxygen on the surface of natural inorganic molecules, and thus mainly function as an adsorbent.

Third, charcoal or activated carbon having excellent adsorption capacity is dried and pulverized at a temperature range of 100 to 500 ° C. to prepare a powder having a particle range of about 50 to 200 mesh. The powder produced in this way has a very large specific surface area and thus shows very good adsorption capacity. Since the adsorption capacity of such charcoal and activated carbon is known from the examples, detailed description thereof will be omitted. However, since the cost is too high when using charcoal or activated carbon alone, highly activated carbon treatment is used in a special field in a water purification plant, but in the present invention, since it forms a granular powder or a shaped body, it is easily recovered and reused so that it can be mixed and used. Done.

Next, the flocculation station will be described. Natural polymers such as chitosan or cellulose or synthetic water-soluble polymers such as polyvinyl alcohol or polyethylene oxide are used as organic curing agents. These polymer materials are mixed with the adsorption elements described above to enable a constant specific gravity and shape control. That is, when such a polymer is added, the polymer is dissolved in a weakly acidic aqueous solution to prepare a viscous water-soluble liquid. Since the liquid phase is solidified by a hydration reaction when reacting with water, it is possible to prepare an adsorbent having various specific gravity by controlling the molar ratio of such agglomeration station. And, such a polymer material itself can also perform a function as a constant adsorbent.

Each powder made as described above is mixed to an appropriate ratio to form a mixed powder, or water is added to the mixed powder and spray-dried to make a granular powder, or molded into a constant shape, and then dried to form a molded body. You can also use it. Then, by adding a viscous liquid such as chitosan and water to the mixed powder, and spray-drying the mixed viscous liquid to produce a solidified granular powder having a particle range of about 10 ~ 200mesh by hydration reaction or to the mixed powder By adding only water or by adding chitosan and water together, a mixed viscous liquid phase is prepared, and then molded into a molding mold and dried to prepare a molded article solidified by a hydration reaction.

As described above, various powders or granulated powders or a specific shape of a molded article having various specific gravity may be produced. In other words, the granular powder forms an excellent effect in the removal of various contaminants such as nitrogen and phosphorus compounds, and is used in the form of granular powder, and thus has no effect on the turbidity of water, Since the plastically processed shells are solidified by a hydration reaction when reacted with water, they have various specific gravity by appropriately adjusting their amount, so that the settling time of the granular powder can be properly adjusted. Therefore, by preparing a granulated powder having an appropriate specific gravity according to the concentration and condition of the pollutant, it is possible to treat the pollutant more efficiently by adjusting the precipitation time.

In addition, by forming in various forms in a viscous liquid phase and drying, it is possible to manufacture various forms of molded articles, and thus it is possible to prepare a new performance adsorbent that cannot be conventionally exhibited. That is, it is possible to adsorb and remove pollutants such as nitrogen and phosphorous compounds by replacing them with cement concrete of submerged beams installed in tributaries of rivers or rivers, or by forming them in the form of natural stones distributed in rivers and valleys and installing them at appropriate locations. . In this case, since it is a molded product rather than a separate powder form, it can be used semi-permanently because it can be collected and decomposed and reused after a certain time.

Hereinafter, specific embodiments of the present invention will be described.

Example 1

15 wt.% Of water was added to a viscous liquid phase in which 20 wt.% Of oyster shells calcined and calcined at 1200 ° C, 70 wt.% Of calcined and dried at 500 ° C, and 10 wt.% Of charcoal powder dried at 150 ° C were well mixed. After the sol phase is spray dried, a granular powder having a constant strength is produced by hydration and drying.

Example 2

5 wt.% Of water was added to a viscous liquid mixture of 20 wt.% Of oyster shells calcined at 1200 ° C, 70 wt.% Of calcined and dried at 500 ° C, and 10 wt.% Of charcoal powder dried at 150 ° C. After the gel phase is formed, it is molded in a mold and dried at 60 ° C. for about 2 hours to produce a molded article having a constant strength by hydration reaction and drying.

Example 3

Viscous liquid phase well mixed with 20wt.% Of oyster shells calcined and fired at 1200 ℃, 67wt.% Ocher powder calcined and dried at 500 ℃, 10wt.% Charcoal powder dried at 150 ℃, and 3wt.% Of chitosan in water-soluble liquid form. When 15 wt.% Of water is added to form a sol phase and then spray drying, granular powder having a constant strength is produced by hydration reaction and drying.

Example 4

Viscous liquid phase well mixed with 20wt.% Of oyster shells calcined and fired at 1200 ℃, 67wt.% Ocher powder calcined and dried at 500 ℃, 10wt.% Charcoal powder dried at 150 ℃, and 3wt.% Of chitosan in water-soluble liquid form. After forming 5% by weight of water to form a gel, and then molded in a molding mold and dried, a molded article having a constant strength is produced by hydration reaction and drying.

Example 5

Oyster shell 20wt.% Fired at 1200 ° C, 37wt.% Ocher powder fired and dried at 500 ° C, 30wt.% Bentonite powder, 10wt.% Charcoal powder dried at 150 ° C, and 3wt.% Chitosan in water-soluble liquid form. To prepare a sol phase by adding 15wt.% Of water to the viscous liquid phase mixed well, and then spray-dried to obtain a granular powder having a constant strength by hydration reaction and drying.

Example 6

20 wt.% Of oyster shells calcined and fired at 1200 ° C, 37 wt.% Ocher powder fired and dried at 500 ° C, 30 wt% bentonite powder, 10 wt.% Charcoal powder dried at 150 ° C, and 3 wt.% Chitosan in water-soluble liquid form 5 wt.% Of water is added to the well-mixed viscous liquid phase to make a gel phase, and then molded into a molding mold and dried to form a molded article having a constant strength by hydration reaction and drying.

Example 7

20 wt.% Of oyster shells calcined and fired at 1200 ° C, 30 wt.% Of ocher powder calcined and dried at 500 ° C, 36 wt.% Of elvan powder, 12 wt.% Of char powder dried at 150 ° C, and 1 wt.% Of chitosan in water-soluble liquid form. To prepare a sol phase by adding 15wt.% Of water to the viscous liquid phase mixed well, and then spray-dried to obtain a granular powder having a constant strength by hydration reaction and drying.

Example 8

Oyster shell 20wt.% Fired at 1200 ℃, crushed and dried ocher powder 30wt.%, 500% elvan powder powder, charcoal powder 12wt.% Dried at 150 ℃, and 2wt.% Chitosan in water-soluble liquid form 5 wt.% Of water is added to the well-mixed viscous liquid phase to make a gel phase, and then molded into a molding mold and dried to form a molded article having a constant strength by hydration reaction and drying.

Experimental Example

The adsorption capacity of the actual contaminants was tested by using the granular powder and the molded body produced by the above examples. As a test method, lead (Pb), a representative heavy metal, was analyzed by atomic absorption spectrophotometer for the adsorption capacity of heavy metal components. The nitrogen and phosphorus compounds were analyzed using spectrophotometer, and the results were as follows.

* The pollutant solution was based on 250 ppm of each pollutant. The amount of adsorbent was 0.1wt.% Based on the pollutant solution, and the result of adsorption removal after 1 hour was added to the pollutant solution.

Comparative example

In order to compare with the above experimental example, the shell powder, a natural inorganic material made of loess and activated carbon, which are generally used in the past, were tested in the same manner as powder having a size of 200 to 300 mesh. Experimental methods and subjects were the same, and the results are shown in the following table.

As shown in Table 3 and Table 4, it can be seen that the adsorbent according to the embodiment of the present invention has a better adsorption performance. In the present invention, since each component is more activated by the plastic working so that a lot of charges are generated, the adsorption performance of chemically cationic heavy metals and nitrogen compounds as well as the adsorption performance of anionic phosphorus compounds are not only improved, but also during the plastic working of shells. It can be seen that the physical adsorption performance is improved as well as being porous.

In addition, although not shown in the above table, it is present in the form of a powder, so that it is suspended on the surface of water, causing secondary contamination due to turbidity increase, and it is difficult to remove pollutants in water. In addition to the size control, it is possible to form a molded body to solve this problem at a time.

As described above, according to the present invention, each component is almost non-toxic because it consists mostly of natural substances, and the granular powder adsorbent prepared has a certain strength and specific gravity due to the hydration reaction during the production of rivers and lakes. It is not only easy to apply to water, sea, and wastewater treatment plant but also does not generate colloidal particles in the form of swelling in water, but it has little effect on turbidity and the specific gravity can be adjusted according to the mixing ratio. There is an effect that can be adjusted freely.

In addition, since the adsorbent in the form of a molded body has a certain strength by hydration reaction, it does not swell even after being left in water for a long time, so that it does not generate suspended solids, and because it has excellent adsorption ability, colloidal suspended solids such as heavy metals and surfactants, In addition, almost all of the nitrogen and phosphorus compounds can be removed, and because they can be manufactured in various forms, there are other effects that are highly applicable.

Claims (9)

10 to 36 wt. It is made of at least one of ocher, montmorillonite, illite, bentonite, elvan or zeolite, and fired and dried at high temperature to pulverize, and the porous natural inorganic powder having a size of 50 to 200 mesh is 42 to 85 wt.%; And An adsorbent for water treatment, having a size of 50 to 200 mesh and comprising 5 to 15 wt.% Of a carbon compound comprising any one of porous charcoal or activated carbon. The method of claim 1, wherein the shell is made of 10 to 36wt.% Calcined at 500 to 1500 ℃, Natural inorganic matter is composed of 42 ~ 85wt.% Calcined and dried at 400 ~ 1000 ℃, Carbon compound is adsorbent for water treatment, characterized in that the mixture is made of 5 to 15wt.% In powder form. The adsorbent for water treatment according to claim 1 or 2, wherein the shell powder, the porous natural inorganic material and the carbon compound are made of a mixture by physical mixing. The adsorbent for water treatment according to claim 3, wherein 5 to 15 wt% of water is mixed with the physical mixture to prepare a viscous mixture, followed by spray drying to form granular powder by hydration of a shell. The method according to claim 3, wherein 5 to 15 wt% of water is mixed with the physical mixture to prepare a viscous mixture, and then formed into a molded body by a hydration reaction of a shell as a molded product having a predetermined shape is dried. Adsorbent for water treatment. The adsorbent for water treatment according to claim 1 or 2, further comprising 1 to 15 wt% of a polymer material dissolved in water and present in an aqueous solution. The adsorbent for water treatment according to claim 6, wherein the polymer material is made of at least one of natural polymers such as chitosan and cellulose or synthetic polymers such as polyvinyl alcohol and polyethylene oxide. 8. The method of claim 7, wherein the adsorbent is mixed with a shell powder, a natural inorganic material and a carbon compound physical mixture and a polymer material in an aqueous solution, 1 to 10wt% of water is added to prepare a viscous liquid mixture by spray drying Adsorbent for water treatment, characterized in that the granular powder form. The method of claim 7, wherein the adsorbent is mixed with a shell powder, a natural inorganic material and a carbon compound and a polymer material in an aqueous solution, 1 to 10wt% of water is added to prepare a viscous mixture, and then has a constant shape Adsorbent for water treatment, characterized in that formed in the form of a molded article produced by drying the molded article.