KR100526254B1 - Reactive geosynthetics for intercepting mitigation of chlorinated organic compounds and method to prepare thereit - Google Patents

Abstract

The present invention discloses a reactive geosynthetic fiber for blocking the movement of a chlorine-based organic compound, characterized in that it contains a zero-valent metal serving as an electron donor in the reduction reaction of the chlorine-based organic compound. 1. A method for preparing a geotextile, the method comprising: coating one or both sides of a surface of a geotextile with a zero-valent metal or a mixture of a zero-valent metal and a catalytic material of the reduction reaction serving as an electron donor in a reduction reaction of a chlorine-based organic compound (S1-1); Disclosed is a method for producing a reactive geosynthetic fiber for the movement blocking of the chlorine-based organic compound comprising, and in the method for producing a geotextile, reduction reaction of the chlorine-based organic compound to the synthetic resin In a mixture of a zero-valent metal or a mixture of the zero-valent metal and the catalytic material of the reduction reaction, acting as an electron donor at Discloses a method of manufacturing geosynthetic reactive for blocking movement of the chlorine-containing organic compound it comprises a; step (S1-2) which provides a raw material for the fiber manufacture. Reactive geosynthetic fibers and a method for producing the same according to the present invention for blocking the movement of chlorine-based organic compounds, a mixture of a zero-valent metal or the zero-valent metal and the catalytic material of the reduction reaction retained in the geosynthetic fiber By rapidly decomposing the chlorine-based organic compound as a reactive substance of, and effectively blocking or reducing the movement of the chlorine-based organic compound through the membrane, it is possible to achieve the effect of preventing contamination of the ground environment.

Description

Reactive geosynthetics for intercepting mitigation of chlorinated organic compounds and method to prepare thereit}

The present invention relates to a reactive geosynthetic fiber for the movement blocking of chlorine-based organic compounds and a method of manufacturing the same, and more particularly, to a reactive geotextile for the movement blocking of chlorine-based organic compounds used in civil construction and environmental fields, etc. It is about.

Due to the increase in population and industrial development, the amount of organic hazardous wastes and the amount of organic solvents are rapidly increasing, and the ground environmental pollution such as groundwater and soil is getting serious due to improper management such as leakage of organic hazardous wastes. to be.

Among the pollutants, chlorine-based organic solvents such as trichlorethylene (TCE), perchloroethylene (PCE), trichloroethane, vinyl chloride, and chloroform require special care because they have a great influence on their frequency of use or human body.

The Ministry of Environment of the Republic of Korea has also enacted the “Management Standards for Tetrachloroethylene and Trichloroethylene” based on the Hazardous Chemical Substances Control Act to strengthen the management of TCE and PCE substances (see Ministry of Environment Notice No. 2000-63).

On the other hand, with the development of the petrochemical industry, various kinds of geosynthetics are produced, and representative ones are geotextiles, geomembranes, geogrids, and geonets. , Geowebs, geomats, geocells, geopipes, geocomposites. Such geotextiles have functions of separation, reinforcement, filtration, screening and drainage, and their use is increasing in civil construction and environment.

However, the use of conventional geotextiles has the following problems.

In other words, volatile organic compounds including chlorine-based organic solvents are known to easily permeate even highly impermeable geotextile fibers such as synthetic resin membranes through a partition-diffusion process (Aminabhavi and Naik, 1999). ; Xiao et al., 1999; See Joo et al., 2001>.

Therefore, even in the case of using geotextiles, volatile organic compounds, unlike inorganic compounds such as heavy metals, can contaminate soil and groundwater around environmental facilities.

1 is a schematic view showing the movement of a chlorine-based organic compound through a conventional synthetic resin order film.

As shown in FIG. 1, the volatile organic compound (VOC) is easily diffused and infiltrated from the compartment to the distilled water compartment by the distribution-diffusion mechanism according to the second law of the pick through the synthetic resin order film. May pollute the ground environment.

Therefore, in the case of installing only geotextiles such as synthetic resin membranes in storage facilities such as landfills, sewage or wastewater reservoirs, and hazardous chemicals (especially chlorine-based organic compounds), chlorine-based organic solvents such as TCE may cause Pollution can not be prevented.

Therefore, the present invention has been made to solve the above problems,

An object of the present invention, unlike the conventional geotextiles, can effectively block or reduce the movement of chlorine-based organic compounds, which can prevent the contamination of the ground environment, reactive geotextiles for the movement blockage of chlorine-based organic compounds and a method of manufacturing the same To provide.

An object of the present invention as described above, the reactive geosynthetic fiber for the movement blocking of the chlorine-based organic compound, characterized in that it contains, on the inside or surface, a zero-valent metal that acts as an electron donor in the reduction reaction of the chlorine-based organic compound Is achieved by.

And, the geotextiles, synthetic resin; And a mixture of said zero valent metal. It is preferable that said geotextile has a coating layer of said zero valent metal on its surface.

The zero-valent metal is preferably zero-valent iron or zero-valent zinc, and the geosynthetic fiber further preferably contains palladium.

An object of the present invention as described above, in the method for producing geotextiles, on one side or both sides of the surface of the geosynthetic fiber, a zero-valent metal or the zero-valent metal that acts as an electron donor in the reduction reaction of a chlorine-based organic compound and the Coating the mixture of the catalytic material of the reduction reaction (S1-1); is achieved by a method for producing a reactive geotextile for blocking the movement of the chlorine-based organic compound comprising a.

The object of the present invention as described above is also a method for producing a geotextile, in the synthetic resin, of the zero-valent metal or the zero-valent metal and the catalytic material of the reduction reaction to act as an electron donor in the reduction reaction of the chlorine-based organic compound Mixing the mixture, providing as a raw material for the production of geosynthetic fiber (S1-2); is achieved by the method for producing a reactive geotextile for blocking the movement of the chlorine-based organic compound comprising a.

And, in the step S1-1 or step S1-2, in order to provide a zero-valent metal, it is preferable to use a reactant of hot rolled sludge, electrostatic dust, shot dust, waste casting sand or steel slag. It is preferable to use the reactants together with the zero valent iron.

Hereinafter, a reactive geotextile for blocking the movement of the chlorine-based organic compound according to the present invention and a manufacturing method thereof will be described in detail.

Reactive geosynthetic fibers and a method for producing the same according to the present invention for blocking the movement of chlorine-based organic compounds, as the geosynthetic fibers contain the zero-valent metal or the zero-valent metal and a catalyst material, the chlorine-based organic solvent even when the geo-fiber is used It is based on the technical idea to achieve the effect of preventing the pollution of the ground environment.

In the present invention, based on the dechlorination of chlorine-based organic compounds using the oxidation reaction of a zero-valent metal such as zero-valent iron or zero-valent zinc, the reaction mechanism is as shown in the following formula (1), for example.

Fe0 + RCl + H ⁺ → Fe ²⁺ + RH + Cl ^_

The reaction is a dechlorination reaction in which chlorine-based organic compounds (RCl) are reduced while zero valent iron is oxidized in the zero valent metal, and the zero valent iron acts as an electron donor in the reaction.

Therefore, in the case of having a zero-valent metal in a conventional general geosynthetic fiber, the chlorine-based organic compound having high harmfulness to humans and the environment is changed into an organic compound (RH) having little or no harmfulness, and the reaction of the zero-valent metal. The substance is held fixed on the inside or surface of the geotextile, so it does not scatter or travel along groundwater.

When the reactant of the zero-valent metal is immobilized on the surface of the geosynthetic fiber, once the conventional general geotextile is manufactured, the zero-valent metal may be coated on one or both sides of the surface to form a coating layer (S1). -One).

On the other hand, when the reaction material of the zero-valent metal is immobilized inside the geosynthetic fiber, it is possible to manufacture geosynthetic fiber as a raw material mixed with a synthetic resin which is a raw material of the zero-valent metal and geosynthetic fiber from the production of the geosynthetic fiber (S1). -2).

Figure 2 is a schematic diagram showing examples of reactive geosynthetic fibers (synthetic resin lining) having zero-valent iron particles on its surface or in accordance with one embodiment of the present invention.

As shown in FIG. 2, a zero-valent iron coating layer may be formed on one or both sides of the surface of the synthetic resin order film [(a) or (b)], and the synthetic resin and the zero-valent iron particles may be completely mixed with the synthetic resin. It is also possible to construct a liner film (in case of (c)).

On the other hand, in the case of using a zero-valent metal such as zero-valent iron or zero-valent zinc, it is preferable to use palladium together as a reaction catalyst.

That is, the dechlorination reaction of the chlorine-based organic compound is more efficiently performed when using a combination of a reactive material of a zero metal and a catalyst such as an alloy of zero iron and palladium, an alloy of zero zinc and palladium, and the like. can do.

In addition, in the dechlorination reaction based on the present invention, in order to provide a zero-valent metal, materials such as hot rolled sludge, electrostatic dust, shot ball dust, waste foundry sand, steel slag (blast furnace slag and steelmaking slag) are used as reactants. It is possible to use these reactants with zero valent iron, and as described above, it is more preferred to use with catalysts such as palladium.

The reactive geosynthetic fiber prepared as described above is installed in a water treatment facility, a vertical water order wall, or a drainage facility to decompose chlorine-based organic compounds.

As described above, the reactive geotextile according to the present invention attaches a reactant such as a zero-valent metal to a geotextile widely used in the field environment, and when it is installed in groundwater or soil contaminated with chlorine-based organic compounds, the reactant The chlorine-based organic compounds that come into contact with the reactants are decomposed into harmless substances by dechlorination without being feared to scatter or move because they are fixed to the geotextile.

Hereinafter, the present invention will be described in more detail by explaining preferred embodiments of the present invention. However, the present invention is not limited to the following examples, and various forms of embodiments can be implemented within the scope of the appended claims, and the following examples are only common in the art while making the disclosure of the present invention complete. It is intended to facilitate the implementation of the invention to those with knowledge.

EXAMPLE

The reactor used in this example was made of stainless steel material having a width of 14.6 cm, a length of 14 cm, and a height of 13 cm.

Figure 3a is a schematic diagram showing an experimental device for experimenting the performance of the reactive geosynthetic fiber (synthetic resin order film) according to an embodiment of the present invention, Figure 3b is a schematic diagram showing an enlarged connection of the reaction tank in the experimental apparatus of Figure 3a .

As shown in FIG. 3A, after filling the two reactors 11 and 12 with the aqueous solution reactor 11 and the distilled water reactor 12 of the target chlorine-based organic compound, respectively, the magnetic rod 14 by the magnetic stirrer 15. The reaction was carried out by rotating, and the mass transfer of the organic material through the reactive geosynthetic fiber 13 liner coated with one surface of the zero-valent iron / palladium alloy was measured.

Each reactor (11, 12) was designed in the form of a bulging top for the discharge of bubbles that can occur during the process of filling the solution or a long experiment.

And, as shown in Figure 3b, the connection between the reaction tank (11, 12), the nitrile gasket (nitrile) known as one of the best gaskets for the volatile organic material among the bolts and nuts 16 and gaskets are commercially available. gasket) 17.

In preparation for the biodegradation that may occur if the experiment is continued for a long time, all the experimental equipment was used after sterilization at high temperature and high pressure, and in the case of the solution to be added to each reactor, 0.005 wt% NaN ₃ was injected as a disinfectant. In addition, the reactor was maintained in a constant temperature room at about 20 ° C. to rule out temperature effects.

The same amount of samples were taken at the same time from two sampling ports 18, and the concentration change in each reactor over time was analyzed by gas chromatography.

Figure 4 is a graph showing the result of comparing the movement characteristics of the chlorine-based organic compound using a reactive geosynthetic fiber coated with a reactive powder of a zero-valent iron / palladium alloy according to the present embodiment and a conventional HDPE geotextile.

In the experiment of FIG. 4, the distribution-diffusion phenomenon of each geotextile was observed during a 50-day experiment with a TCE solution having an initial concentration of 100 mg / l.

As shown in FIG. 4, in the case of the general geotextile lining (dots marked HDPE), after 30 days, equilibration was achieved at a TCE concentration of about 45 mg / l by distribution and diffusion.

On the other hand, in the case of reactive geosynthetic membranes (dots labeled Pd / Fe), after 30 days, TCE concentration of 1 mg / l was detected in the TCE reactor containing TCE by dechlorination reaction with the reactive substance. In the distilled water reaction tank containing distilled water, the TCE concentration was not detected because the movement through the reactive order membrane of TCE was inhibited.

Accordingly, it can be seen that the reactive geosynthetic membrane can effectively reduce or block the movement of chlorine-based organic compounds by inducing rapid decomposition of chlorine-based organic compounds and slow movement of chlorine-based organic compounds by reactive materials.

Therefore, the reactive geosynthetic membrane according to the present invention is highly feasible, and can be applied to a variety of ground environmental fields such as a vertical drainage facility for blocking the movement of contaminated groundwater and a drainage facility of a waste landfill. It can be usefully used for complying with "the management criteria for tetrachloroethylene and trichloroethylene".

Reactive geosynthetic fibers and a method for producing the same according to the present invention for blocking the movement of chlorine-based organic compounds, a mixture of a zero-valent metal or the zero-valent metal and the catalytic material of the reduction reaction retained in the geosynthetic fiber By rapidly decomposing the chlorine-based organic compound as a reactive substance of, and effectively blocking or reducing the movement of the chlorine-based organic compound through the membrane, it is possible to achieve the effect of preventing contamination of the ground environment.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

1 is a schematic diagram showing the movement of a chlorine-based organic compound through a conventional synthetic resin order film,

Figure 2 is a schematic diagram showing examples of reactive geotextiles according to an embodiment of the present invention,

Figure 3a is a schematic diagram showing an experimental apparatus for experimenting the performance of the reactive geosynthetic fiber (synthetic resin lining) according to an embodiment of the present invention,

Figure 3b is a schematic diagram showing an enlarged reaction joint connection site of the experimental apparatus of Figure 3a,

Figure 4 is a graph showing the results of comparing the movement characteristics of the chlorine-based organic compound using a reactive geosynthetic fiber coated with a reactive powder of a zero-valent iron / palladium alloy according to an embodiment of the present invention and a conventional HDPE geotextile to be.

* Short description of the major reference marks *

10: performance test apparatus 11: chlorine-based organic compound reactor

12 distilled water reactor 13 reactive geosynthetic membrane

14 magnetic rod 15 magnetic stirrer

16 bolt and nut 17 nitrile gasket

Claims (10)

Reactive geotextile for blocking the movement of the chlorine-based organic compound, characterized in that it contains a zero-valent metal that acts as an electron donor in the reduction reaction of the chlorine-based organic compound. According to claim 1, wherein the geotextile, Synthetic resins; And a zero valent metal. Reactive geotextile for blocking the movement of chlorine-based organic compounds, characterized in that it holds a mixture of. According to claim 1, wherein the geotextile, Reactive geotextile for blocking the movement of the chlorine-based organic compound, characterized in that having a coating layer of the zero-valent metal on the surface. The method according to any one of claims 1 to 3, wherein the zero-valent metal, Reactive geotextile for blocking the movement of chlorine-based organic compounds, characterized in that 0 valent iron or 0 valent zinc. The method of claim 4, wherein the geotextile, Reactive geotextile for blocking the movement of chlorine-based organic compounds, characterized in that it further contains palladium. In the manufacturing method of geotextiles, Reactive civil engineering for blocking the movement of chlorine-based organic compounds comprising the step (S1-1) coating on the one or both sides of the surface of the geosynthetic fiber, the zero valent metal acting as an electron donor in the reduction reaction of the chlorine-based organic compound Method of making fibers. In the manufacturing method of geotextiles, Blocking the movement of the chlorine-based organic compound, comprising the step (S1-2) of mixing a 0-valent metal acting as an electron donor in the reduction reaction of the chlorine-based organic compound to the synthetic resin, as a raw material for the production of geotextiles Method for producing a reactive geotextile for. The method according to claim 6 or 7, wherein the manufacturing method is In step S1-1 or step S1-2, a method for producing a reactive geotextile for blocking the movement of the chlorine-based organic compound, characterized in that using a mixture of the zero-valent metal and the catalytic material of the reduction reaction. The method according to claim 6 or 7, wherein the manufacturing method is In the step S1-1 or the step S1-2, in order to provide a zero-valent metal, the movement blocking of the chlorine-based organic compound, characterized in that the reaction material of hot rolled sludge, electrostatic dust, shot ball dust, waste foundry sand or steel slag Method for producing a reactive geotextile for. The method of claim 9, wherein Method for producing a reactive geotextile for blocking the movement of the chlorine-based organic compound, characterized in that using the reactant with zero valent iron.