KR101985765B1 - Treatment Method of Pollutants using Rice Straw Ash and Apparatus for Treatment of Pollutants - Google Patents

Abstract

The present invention relates to a pollutant disposal method and a pollutant disposal apparatus using rice straw powder, comprising the steps of injecting persulfate into an object to be treated and injecting rice straw powder into the object to be treated with the persulfate .
According to the present invention, it is possible to remove contaminants by decomposing and adsorbing heavy metal pollutants and organic pollutants using powdered rice straw as a material which can be easily obtained at a low cost.

Description

TECHNICAL FIELD The present invention relates to a method for treating a pollutant using a rice straw powder,

The present invention relates to a pollutant disposal method and a pollutant disposal apparatus using rice straw powder, more specifically, to an adsorption effect of rice straw powder itself and an oxidation effect of sulfate radicals and active oxygen species generated by the activation of persulfate, The present invention relates to a pollutant disposal method and a pollutant disposal apparatus using rice straw powder capable of effectively removing degradable pollutants.

If water pollution occurs due to the inflow of pollutants into water sources such as rivers, lakes, rivers, water supply and sewerage systems, it can cause huge damage to property as well as people. As the perception of ever-increasing environmental pollution becomes widespread, many efforts have been made to solve water pollution such as rivers, lakes, rivers, water supply and sewerage systems.

Thus, a cobalt-based Cobalt / peroxymonosulfate system is disclosed as a pollutant purification technique [ Non-Patent Document 1 ], which has a problem that cobalt ions, which are reaction products, are dissolved in water and cause secondary contamination.

Rice straw, on the other hand, is an agricultural by - product generated during rice production and is generally regarded as waste. Rice straw is produced by the Food and Agriculture Organization, which produces around 1 billion tons worldwide, and is currently being used mainly as fertilizer or animal feed in Korea.

 [Non-Patent Document 1] A study on the treatment of TPH contaminated soil using Cobalt / peroxymonosulfate system, Hanyang University Graduate School, 2009. 02.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pollutant disposal method and a pollutant disposal apparatus using rice straw powder which can be easily obtained at a low cost in the vicinity.

The present invention also provides a method for effectively removing degradation-resistant contaminants by simultaneously having an adsorption effect of rice straw powder itself and an oxidation effect of sulfate radicals (SO ₄ ^- ) and active oxygen species produced by the activation of persulfate And a method for treating a pollutant using rice straw powder and a pollutant treating apparatus.

It is another object of the present invention to provide a pollutant treatment method and apparatus for treating pollutants using environmentally friendly, economical and efficient rice straw powder by making it possible to recycle the rice straw powder used for treating pollutants.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

According to an embodiment of the present invention, there is provided a method of treating pollutants, comprising the steps of: (A) injecting persulfate into an object to be treated; And (B) injecting rice straw powder into the object to be treated which is injected with the persulfate; . ≪ / RTI >

The object to be treated may include at least one of heavy metal pollutants or organic pollutants.

The persulfate may be Peroxy Monosulfate (PMS).

The method of treating contaminants may include: processing the input straw straw powder;

As shown in FIG.

Wherein the processing step comprises: drying the collected rice straw; Carbonizing or semi-carbonizing the dried rice straw; And crushing the carbonized or semi-carbonated rice straw; . ≪ / RTI >

The step of carbonizing or semi-carbonizing may be carried out under an atmospheric or nitrogen atmosphere.

Selecting the rice straw powder having a uniform particle size among the pulverized rice straw powder in the pulverizing step; As shown in FIG.

(C) recovering the introduced rice straw powder from the object to be treated after a predetermined time has elapsed since the rice straw powder was introduced in the step (B); As shown in FIG.

The method of treating contaminants may include: reworking the recovered rice straw powder; As shown in FIG.

The recovering may be performed using at least one of a centrifuge, a filter, or a filter.

The re-processing may include: heating the recovered rice straw powder using a furnace to carbonize or semi-carbonize the recovered rice straw powder; As shown in FIG.

According to another aspect of the present invention, there is provided an apparatus for treating pollutants, comprising: an injection unit into which an object to be treated is injected; A reaction part including a persulfate and a rice straw powder and through which the treatment object injected through the injection part flows; And a discharge unit through which the object to be treated having passed through the reaction unit is discharged; . ≪ / RTI >

The inside of the reaction part may be filled with a mixture of persulfate, carbonization or torrefaction rice straw powder and sand particles.

The rice straw powder may be carbonized or semi-carbonized by heating under atmospheric or nitrogen atmosphere.

The rice straw powder may have a uniform size.

The persulfate may be Peroxy Monosulfate (PMS).

The injection unit may be provided at a lower portion of the reaction unit, and the discharge unit may be provided at an upper portion of the reaction unit.

According to the present invention, it is possible to remove contaminants by decomposing and adsorbing heavy metal contaminants and organic contaminants using a rice straw which is easily obtained at a low cost and is formed into a powder.

Specifically, it utilizes the adsorption effect of the rice straw powder and activates persulfate to generate sulfate radicals (SO ₄ ^- ) and reactive oxygen species, thereby oxidizing contaminants, Can be removed.

Also, the rice straw powder used in the method for treating pollutants using the rice straw powder and the rice straw powder used in the pollutant treating apparatus according to an embodiment of the present invention can be recovered and reused, so that it is eco-friendly and economically effective for treating pollutants have.

1 is a flowchart illustrating a pollutant disposal method according to an embodiment of the present invention.
2 is a schematic view of a method of activating persulfate using rice straw powder according to an embodiment of the present invention.
3 is a graph showing an effect of adsorbing organic contaminants on rice straw powder according to another embodiment of the present invention.
FIG. 4 is a graph illustrating the degree of activation of persulfate when rice straw powder is used as an experimental example according to another embodiment of the present invention. FIG.
FIG. 5 is a graph illustrating decomposition effects of organic pollutants in a method of removing pollutants using rice straw powder and persulfate as experimental examples according to another embodiment of the present invention. FIG.
6 is a view showing a pollutant decomposition apparatus according to another embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

Various features of the invention disclosed in the claims may be better understood in view of the drawings and detailed description. The devices, methods, processes and various embodiments disclosed in the specification are provided for illustration. The disclosed structural and functional features are intended to enable a person skilled in the art to practice various embodiments and are not intended to limit the scope of the invention. The terms and phrases disclosed are intended to facilitate understanding of the various features of the disclosed invention and are not intended to limit the scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, a method for treating contaminants using rice straw powder according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a flowchart illustrating a method for treating contaminants according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a method for activating persulfate using rice straw powder according to an embodiment of the present invention.

Referring to FIG. 1, the pollutant treatment method according to the present embodiment includes injecting persulfate into a treatment object (S110); A step (S120) of applying rice straw powder to the object to be treated with the persulfate; . ≪ / RTI >

Step S110 is a step of injecting persulfate into a contaminant such as wastewater, which is an object to be treated. Here, the object to be treated is not specified, and may be contaminated groundwater, wastewater, contaminated soil or the like containing at least one of heavy metals and organic pollutants.

In step S120, rice straw powder processed into the object to which the persulfate is injected is further added. The rice straw powder to be added can be processed through the following process. Collected rice straw is processed into powder form. The collected rice straws are first dried using a dryer or natural light. The dried rice straw is cut and crushed to a small size using a crusher or the like. Then, the rice straw powder can be carbonized and / or torrefaction by heating under atmospheric or nitrogen conditions (atmosphere). Here, rice straw powder having a uniform particle size can be obtained through a sieve and the like. The carbonized and / or semicarbonated rice straw powder is dense and hard, and is easy to store and easy to use.

In step S120, the rice straw powder injected into the object to be treated activates the persulfate previously injected into the object to be treated, thereby generating a sulfate radical and an active oxygen species. Referring to FIG. 2, the hydroxide ion (OH ^- ) that activates persulfate is generated by a mechanism according to the following reaction formula (1).

[Reaction Scheme 1]

Specifically, carbonates (K ₂ CO ₃ , Na ₂ CO ₃ ), which are basic substances, are contained in the carbonized and / or semi-carbonized rice straw powder. When the carbonate is dissolved in water, the carbonate anion hydrolyzes to generate hydroxide ion (OH ^- ). This hydroxide ion activates persulfate to produce sulfate radicals and reactive oxygen species. The resulting sulfate radicals and reactive oxygen species act as oxidizing agents to effectively remove organic contaminants.

On the other hand, the method of treating pollutants using rice straw powder according to the present embodiment can not only oxidize and remove organic pollutants, but also adsorb and remove organic pollutants through the powder itself. That is, by the injection of the rice straw powder, the organic pollutants can be effectively removed more quickly by using both the oxidation removal and the adsorption removal using the persulfate activation.

Rice straw powder can adsorb heavy metal pollutants in addition to organic pollutants. Rice straw contains Cellulose, Hemicellulose, Lignin, and Silica, which can effectively adsorb pollutants.

Thus, by using the method for treating contaminants using rice straw powder according to the present embodiment, contaminants can be removed by activating persulfate as well as contaminants can be removed using adsorption. Therefore, And can quickly remove organic pollutants and heavy metals.

Also, in the method of treating pollutants using the rice straw powder according to the present embodiment, the rice straw powder used for removing contaminants can be recycled.

Specifically, the straw straw powder used for removing contaminants is recovered using at least one of centrifugal separation method, filtration method, and filter method. Rice straw powder may be recovered after a predetermined time has elapsed since the rice straw powder was put into the object to be treated. The preset time is not specified and can be set appropriately according to the purpose of use and the environment. For example, rice straw powder can be recovered after a sufficient time has elapsed to remove the contaminants contained in the object to be treated.

Then, the recovered rice straw powder can be carbonized and / or semi-carbonized by heating. Preferably, the rice straw powder recovered by heating using a furnace can be carbonized and / or semi-carbonated again. The rice straw powder thus reprocessed can be used to remove contaminants by injecting it again into the object to be treated.

Thus, according to the present invention, the rice straw powder can be recycled, and the pollutant can be removed more efficiently, economically, and efficiently.

On the other hand, the reactor in which the pollutant treatment method according to the present embodiment is performed is not specified, and the type, form, etc. of the reactor can be appropriately changed depending on the purpose of use and environment. For example, the pollutant treatment method according to this embodiment can be applied to a batch type reactor or a column type reactor.

Hereinafter, with reference to FIG. 3 and FIG. 4, a description will be given of an experimental example of decomposition of pollutants in water according to another embodiment of the present invention. The description overlapping with the above description is omitted.

However, the scope of the present invention is not limited to the experimental conditions according to the experimental examples, and the conditions corresponding to the experimental conditions can be appropriately changed according to the purpose of use and the environment.

Experimental Example 1: Experiments on the adsorption effect of contaminants on rice straw powder

3 is a graph showing an effect of adsorbing organic contaminants on rice straw powder according to another embodiment of the present invention.

In this experiment, the amount (concentration) of rice straw powder was adjusted to 1, 5 g / L, and the organic contaminant to be treated was set to 0.01 mM atrazine. The reaction time was set to 2 hours.

Referring to FIG. 3, it can be seen that the rice straw powder rapidly adsorbs atrazine and effectively removes the atrazine, and it is found that the atrazine is removed more rapidly when the amount of the rice straw powder is large. When the amount of rice straw powder was 5g / L, about 45% of atrazine was removed by adsorption.

Experimental Example 2: Activation test of persulfate using rice straw powder

FIG. 4 is a graph illustrating the degree of activation of persulfate when rice straw powder is used as an experimental example according to another embodiment of the present invention. FIG.

In this experimental example, the activation level of 1 mM KHSO ₅ and sulfate (PeroxyMonoSulfate; PMS) is derived when the amount (concentration) of rice straw powder is 0.01-20 g / L. The pH of the initial reaction solution was adjusted by using phosphate buffer solution (pH ₄ ) and acid (HClO ₄ ) and base (NaOH). The reaction time was set to 2 hours.

Referring to FIG. 4, the pH of the aqueous solution was increased as the amount of rice straw powder was increased, and the pH was increased up to 11 even in the presence of daily sulphate. In this experiment, it was confirmed that about 30% of the daily sulphate was decomposed within 10 minutes of the reaction time when the input amount (input concentration) of the rice straw powder was 20 g / L. As a result, it can be seen that the carbonate ions and the like contained in the rice straw powder injected into the object to be treated are hydrolyzed, and hydroxide ions for activating the persulfate can be sufficiently supplied.

Experimental Example 3: Disintegration test using rice straw powder and persulfate

FIG. 5 is a graph illustrating decomposition effects of organic pollutants in a method of removing pollutants using rice straw powder and persulfate as experimental examples according to another embodiment of the present invention. FIG.

In this experiment, the amount (concentration) of rice straw powder was adjusted to 1, 5 g / L, 1 mM KHSO ₅ day and peroxy monosulfate (PMS) were set as persulfate and 0.1 mM phenol was set as pollutant. Phosphate buffer solution was used as initial reaction solution and pH was adjusted with acid (HClO ₄ ) and base (NaOH). The reaction time was set to 2 hours.

Referring to FIG. 5, it can be seen that the injected rice straw powder and persulfate rapidly remove the phenol. When the amount of the rice straw powder is 5 g / L, 100% of the phenol is removed within 30 minutes of the reaction time.

6 is a view showing a pollutant treatment apparatus according to another embodiment of the present invention. The description overlapping with the above description is omitted.

Referring to FIG. 6, the pollutant treatment apparatus 1 according to the present embodiment may include an injection unit 610, a reaction unit 620, a discharge unit 630, and a pump 640.

The object to be treated is injected into the reaction part 620 through the injection part 610. The object to be treated is not specified, and may be an object contaminated with heavy metal pollutants and / or organic pollutants, such as contaminated ground water, sewage of contaminated soil, and the like.

The reaction unit 620 may include rice straw powder, sand particles, and persulfate. Preferably, rice straw powder, sand particles, and persulfate may be mixed into the reaction part 620 in the form of a mixture. The sand particles in the column type reaction part 620 are supplied to the injection part 610 and the discharge part 630 side and the rice straw powder and persulfate are mixed with the sand particles on the injection part 610 side and the sand particles on the discharge part 630 side As shown in FIG. This is to prevent leakage of rice straw powder and persulfate.

Rice straw powder may be carbonized or semi-carbonated under an atmospheric or nitrogen condition (atmosphere), and may preferably have a uniform size.

The type of persulfate is not specified and can be, for example, PeroxyMonoSulfate (PMS).

The object to be treated flows (passes) through the reaction part 620, and contaminants are removed by the rice straw powder, sand particles and persulfate contained in the reaction part 620.

The discharge part 630 discharges the object to be treated, from which the contaminant has been removed (processed), through the reaction part 620.

Meanwhile, when the injection unit 610 is provided on the upper part of the reaction part 620 and the discharge part 630 is provided on the lower part of the reaction part 620, the reaction part 620 is rapidly passed by gravity, Also, a hole is formed in the mixture in the reaction part 620. As a result, the object to be treated does not pass through the reaction part 620 for a sufficient time, and it may be difficult to effectively remove contaminants.

On the other hand, when the injection unit 610 is provided below the reaction unit 620 and the discharge unit 630 is provided above the reaction unit 620, a hole is formed in the mixture in the reaction unit 620 Therefore, there is an advantage that the object to be treated can roughen the reaction part 620 for a sufficient time, and the contaminant can be effectively removed.

The injector 610 may be disposed below the reaction unit 620 and the discharge unit 630 may be provided above the reaction unit 620. In this case, the pump 640 is connected to the injection unit 610, so that the object to be treated can be injected into the reaction unit 620.

In addition, the pollutant treatment apparatus 1 according to the present embodiment is configured not to apply the rice straw powder and persulfate to the treatment object but to input the treatment subject to the pollutant treatment apparatus 1, The object to be treated and discharged does not include straw straw powder, sand particles and the like. Therefore, even if the rice straw powder or the like is not removed after the pollutant treatment, the treated object treated with the pollutant can be directly used for drinking water, agricultural water, industrial water, and the like.

As described above, according to the present invention, it is possible to provide a pollutant disposal method and a pollutant disposal apparatus using rice straw powder which can be easily obtained at a low cost in the vicinity.

The present invention also relates to a method and apparatus for treating contaminants using rice straw powder capable of effectively removing poorly decomposable contaminants simultaneously with the adsorption effect of rice straw powder itself and the oxidation effect of sulfate radicals and reactive oxygen species generated by the activation of persulfate Processing apparatus can be provided.

Further, by allowing the rice straw powder used for treating the pollutant to be recycled, it is possible to provide a pollutant treatment method and a pollutant treatment apparatus using environmentally-friendly, economical and efficient rice straw powder.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed herein are for the purpose of describing, not limiting, the technical spirit of the present invention, and the scope of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of the same should be understood as being included in the scope of the present invention.

S110: Step of injecting persulfate into the object to be treated
S120: Step of injecting rice straw powder into the object to be treated with persulfate
1: Pollutant disposal unit
610: injection part 620: reaction part
630: Discharging section 640: Pump

Claims (17)

delete delete delete delete delete delete delete delete delete delete delete An injection unit into which a treatment object is injected through a pump;
A reaction part including sand particles, persulfate, and carbonization or torrefaction rice straw powder, through which the treatment object injected through the injection part flows; And
A discharge unit through which the object to be treated having passed through the reaction unit is discharged;
Lt; / RTI >
Wherein the injecting portion is provided at a lower portion of the reaction portion,
Wherein the discharge portion is provided on an upper portion of the reaction portion,
Wherein the sand particles are arranged in each of an upper portion and a lower portion of the reaction portion,
The persulfate and the rice straw powder are arranged between the sand particles arranged on the upper part of the reaction part and the sand particles arranged on the lower part of the reaction part,
Wherein the persulfate is activated by hydroxide ions generated from the rice straw powder,
Contaminant treatment equipment.
13. The method of claim 12,
Inside the reaction part,
Wherein the rice straw powder and the sand particles mixed with persulfate, carbonization or torrefaction are mixed and filled,
Contaminant treatment equipment.
13. The method of claim 12,
The rice straw powder,
Which is heated under atmospheric or nitrogen atmosphere to form carbonized or semi-
Contaminant treatment equipment.
13. The method of claim 12,
The rice straw powder,
A uniform size,
Contaminant treatment equipment.
13. The method of claim 12,
The persulfate may be,
Which is PeroxyMonoSulfate (PMS)
Contaminant treatment equipment.
delete

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