KR101826756B1 - System using refined tablets containing sand for remediating nitrate contaminated ground water - Google Patents

Abstract

A system for reducing nitrate nitrogen in a groundwater according to an embodiment of the present invention is formed in the shape of a hollow tube and is inserted from an indicator (3) to an underground water channel, ) 10; (21) floated on the surface of the groundwater (1) introduced into the tube (10) and continuously supplied with fumaric acid or fumaric acid salt (21) for a predetermined period of time. The fumaric acid or fumaric acid salt Type purifying agent 20 that releases nitrate nitrogen in the groundwater 1 by discharging the nitrate nitrogen from the groundwater 1 and forms a purified water containing fumaric acid or fumaric acid salt 31, And a sedimentation type purifying agent 30 which is settled on the bottom and continuously discharges fumaric acid or fumaric acid salt 31 for a predetermined period of time to remove nitrate nitrogen.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a system for refining nitrate-

The present invention relates to a system capable of reducing nitrate nitrogen in ground water.

The problem of contamination of groundwater by nitrate nitrogen is serious due to excessive use of fertilizer, underground infiltration of domestic sewage, and inadequate management of animal wastes. Nitrate Nitrogen is a substance that is ultimately produced in the course of decomposition, fermentation, oxidation, etc. of nitrogen compounds such as proteins and is used as an indicator of water pollution and an eutrophication in water bodies. Nitrate nitrogen is chemically inert but can be reduced by action by microorganisms. If the concentration of nitrate nitrogen is more than 10 ppm, it may cause cyanosis in infants. The World Health Organization prohibits the use of tap water containing high-concentration nitrate nitrogen in baby foods, .

As a related art, a well-to-well circulation method for restoring nitrate nitrogen pollution in ground water has been disclosed (Patent Document 1). According to this method, two or more pairs of injection and circulation wells are constructed in consideration of the groundwater flow, the chemical solution is injected from the upstream well, the groundwater is circulated from the downstream part to form the flow wall of the groundwater, , Formate, and lactate are injected into a liquid phase, a packer is installed in an injection solution, and a chemical solution is appropriately injected through a packer.

However, when an electron donor such as formate is injected into a liquid phase, there is a disadvantage in that it is inconvenient to store and manage it. In particular, there is a disadvantage that it requires a lot of installation cost because it requires digging two wells for injection and circulation.

Patent Document 1: Korean Patent Registration No. 10-0538384

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a groundwater surface that flows into the hollow tubular well inserted from an earth surface to an underground water channel, And a purification agent disposed therein to simultaneously remove nitrification nitrogen from the water surface and underwater floor.

According to an embodiment of the present invention, the nitrate nitrogen reduction system of the groundwater is formed in a hollow tube shape, and the groundwater is introduced into the groundwater from the surface to the groundwater channel; Wherein the fumaric acid or fumaric acid salt is suspended in the water surface of the groundwater flowing into the canal and continuously discharges fumaric acid or fumaric acid salt for a predetermined time to remove nitrate nitrogen in the ground water Negative-type cleaning agents; And a fumaric acid or a fumaric acid salt, wherein the fumaric acid or the fumaric acid salt is precipitated on the water floor of the groundwater flowing into the canal and continuously discharges the fumaric acid or fumaric acid salt for a predetermined time to remove the nitrate nitrogen And a sedimentation type purifying agent.

Further, in the nitrate nitrogen reduction system of the groundwater according to the embodiment of the present invention, fine pores are formed through the outer surface of the pipe arranged in the groundwater flow passage so that the groundwater flows in.

In addition, in the nitrate nitrogen reduction system of the groundwater according to the embodiment of the present invention, the filtration yarn disposed on the outer surface of the well and blocking the inflow of the soil through the fine perforation.

Further, in the nitrate nitrogen reduction system for groundwater according to the embodiment of the present invention, the weight of the fumaric acid or fumaric acid salt is 30 to 70% (w / w) based on the total weight of the subtype purifier or the sedimentation type purifier, to be.

In addition, in the nitrate nitrogen reduction system for groundwater according to the embodiment of the present invention, the subtype purification agent may be calcium carbonate; And citric acid which reacts with the carbonate to release carbon dioxide, thereby generating buoyancy.

In addition, in the nitrate nitrogen reduction system for groundwater according to the embodiment of the present invention, the total weight of the calcium carbonate and the citric acid is 30 to 55% (w / w) based on the total weight of the negative type cleaning agent.

In addition, in the nitrate nitrogen reduction system for groundwater according to the embodiment of the present invention, each of the subtype purification agent and the sedimentation type purification agent may further include a sustained release polymer material so that the fumaric acid or fumarate salt is continuously released do.

In addition, in the nitrate nitrogen reduction system for groundwater according to the embodiment of the present invention, the sustained-release polymer material may be at least one selected from the group consisting of hydroxypropyl methylcellulose, hydroxymethylcellulose, and hydroxyethylcellulose Or more.

In addition, in the nitrate nitrogen reduction system for groundwater according to the embodiment of the present invention, the sedimentation type purification agent further includes a position adjusting agent so as to settle on the underwater floor of the groundwater.

Further, in the nitrate nitrogen reduction system for groundwater according to the embodiment of the present invention, the position adjuster is sand.

Further, in the nitrate nitrogen reduction system for groundwater according to the embodiment of the present invention, the weight of the position adjusting agent is 25 to 55% (w / w) based on the total weight of the sedimentation type cleaning agent.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention, the ground water surface introduced into the interior of the hollow tubular body inserted from the ground to the ground water flow path and the slow-acting purifying agent for releasing fumaric acid or fumaric acid salt on the water floor are disposed, so that fumaric acid or fumaric acid salt is continuously discharged for a long time By removing nitrate nitrogen, pollutants can be removed simultaneously from the surface of water and underwater.

In addition, the amount of fumaric acid or fumaric acid salt in the slow-acting cleaning agent disposed in the bathtub can be controlled according to the flow rate, depth, and degree of contamination of the groundwater, effectively reducing the source of contamination and preventing the micro- have.

Furthermore. Since the slow-acting cleaning agent is disposed in the form of a solid tablet in the form of a tablet, it is easy to store and manage the electron donor such as formaldehyde in a liquid phase, and the contamination source is reduced through a single well, Can be installed.

1 is a cross-sectional view illustrating a nitrate nitrogen reduction system for groundwater according to an embodiment of the present invention.
2 is an enlarged view of circle A in Fig.
3 is a cross-sectional view illustrating a nitrate nitrogen reduction system for groundwater according to another embodiment of the present invention.
4 is a graph showing the degree of release of fumaric acid or fumaric acid salt depending on elution time in the case where different amounts of the sustained release polymeric material are contained.
5 is a graph showing the degree of release of fumaric acid or fumaric acid salt depending on elution time of the precipitating type cleaning agent having different densities.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. Also, the terms "first "," second ", and the like are used to distinguish one element from another element, and the element is not limited thereto. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a nitrate nitrogen reduction system for groundwater according to an embodiment of the present invention, and FIG. 2 is an enlarged view of circle A of FIG.

As shown in FIGS. 1 and 2, the nitrate nitrogen reduction system for groundwater according to the embodiment of the present invention is formed in the shape of a hollow pipe, inserted from the ground surface 3 to the ground water channel, (10) into which the air flows; (21) floated on the surface of the groundwater (1) introduced into the tube (10) and continuously supplied with fumaric acid or fumaric acid salt (21) for a predetermined period of time. The fumaric acid or fumaric acid salt Type purifying agent 20 that releases nitrate nitrogen in the groundwater 1 by discharging the nitrate nitrogen from the groundwater 1 and forms a purified water containing fumaric acid or fumaric acid salt 31, And a sedimentation type purifying agent 30 which is settled on the bottom and continuously discharges fumaric acid or fumaric acid salt 31 for a predetermined period of time to remove nitrate nitrogen.

The groundwater 1 refers to the water flowing under the surface of the earth 3. The velocity of the groundwater 1 travels on the average of several tens of centimeters to several meters per day, Is not constant and is filled by surface water, pollution by nitrate nitrogen is also caused by pollution of the surface (3). Here, nitrate nitrogen is a final product in which a nitrogen compound in an organic substance is oxidized and decomposed to be mineralized, and a nitrogen compound such as a protein is finally produced in the course of decay, fermentation, oxidation, and the like. The contamination of the groundwater (1) by the nitrate nitrogen is caused by excessive use of fertilizer, underground infiltration of domestic sewage, and improper management of animal wastes. In order to reduce contamination of groundwater (1) by nitrate nitrogen, A system suitable for the characteristics of the same groundwater (1) is needed.

The most economical and efficient way to remove nitrate nitrogen from water is the biological denitrification method.

Here, denitrification is a heterotrophic denitrification process in which NO ₃ ^- → NO ₂ ^- → NO → N ₂ O → N ₂ is reduced (Kalkowski et al., 1991). That is, it is a process of reducing nitrate nitrogen and nitrite nitrogen to molecular nitrogen gas (NO, N ₂ O, N ₂ ) by heterotrophic denitrifying microorganisms. In the oxygen-rich state, most of the microorganisms use oxygen as a terminal electron acceptor to perform nitrification. However, in an oxygen-deficient environment, the denitrifying microorganisms breathe in NO ₃ ^- as a final electron acceptor (Denoted by Matsom and Harriss, 1995), the denitrification process usually occurs in an oxygen-free or low oxygenated environment (DO = 0.2 mg / L or less).

The nitrate nitrogen reduction system of the groundwater according to the present invention is also applied to the biological denitrification method described above, including the irrigation can 10, the sub-type irrigation agent 20, and the sedimentation type irrigation agent 30.

Here, the tube 10 is formed in the shape of a hollow tube having a hollow inside and having a predetermined length. The vessel 10 is placed in the soil and the vessel 10 is drilled by performing a separate excavation work at the site where the vessel 10 is placed and the vessel 10 is placed in the hole, To the groundwater channel.

At this time, micro-perforations 11 are formed in the outer surface of the tube 10 disposed in the groundwater flow path so that the groundwater 1 flowing along the groundwater flow path can be introduced into the tube 10. Here, the diameter of the micro-perforations 11 may be formed smaller than the soil particles so that the soil introduced together with the ground water 1 can not flow into the soil 10. However, the diameter does not necessarily have to be smaller than the soil diameter.

Since the groundwater 1 flowing into the canal 10 contains nitrate nitrogen, the negative type cleaner 20 and the sedimentation type cleaner 30 are disposed in the canal 10 to remove it.

Here, the negative type cleaning agent 20 is a cleaning agent for removing the nitrate nitrogen in the ground water 1, and is formed into a solid tablet form having a hard solid and a uniform shape.

This subtype purifier 20 contains fumaric acid or fumaric acid salt 21 and removes nitrate nitrogen by releasing fumaric acid or fumaric acid salt 21 from the water surface of groundwater 1. The microorganisms involved in the denitrification process are not clearly identified, but typically include Pseudomonas , Bacillus, Thiobacillus, and Propionibacillus . Since these microorganisms are extensively present in common soils, no steps are required to inject specific microorganisms into the target area in the biological denitrification method. At this time, the energy required for growth of the microorganisms can be obtained from the oxidation process of the electron donor by reducing the nitrogenous gas to nitrogen gas, but organic carbon source, which is an electron donor, is required for cell synthesis. At this time, fumaric acid or fumaric acid salt is provided as an organic carbon source. Formate, propionate, lactate and the like are known organic carbon sources, but the nitrate nitrogen removal efficiency is lower than that of the fumaric acid or fumaric acid salt (21) according to the present invention, , Fumaric acid or fumaric acid salt (21) is suitable in view of efficiency and economical efficiency. Experimentally, the pH of the fumaric acid salt (21) contained in water at a concentration of 3 mg / ml was 7.31, which is harmless to humans and the environment.

At this time, the fumaric acid or fumaric acid salt is contained in the negative type cleaning agent 20 to have a weight of 30 to 70% (w / w) based on the total weight of the negative type cleaning agent 20. Here, when the negative-type cleaning agent 20 is excessively injected, the micro-perforations 11 of the tube 10 may be inadvertently closed by the membrane formed by a plurality of microorganisms, and the micro- The amount can increase, causing water pollution. On the other hand, when the amount of fumaric acid or fumaric acid salt (21) is small, the denitrification effect does not occur satisfactorily and the desired effect can not be achieved. At this time, since the subtype purifying agent 20 contains a pharmaceutically acceptable excipient in addition to the fumaric acid or the fumarate salt 21 and a component capable of having a floating property and a slow-releasing property, which will be described later, , Depth, degree of contamination, etc., the weight of the fumaric acid or the fumaric acid salt (21) can be determined within the above range.

The subtype purifying agent 20 has a floating property and floats on the surface of the groundwater 1 introduced into the vessel 10. Therefore, it is possible to effectively remove the nitrate nitrogen flowing out from the vicinity of the indicator 3 and flowing into the surface of the groundwater 1.

At this time, the negative type cleaning agent 20 may include a carbonate and an organic acid to have a floating property. Here, the carbonic acid and organic acid react with each other to release carbon dioxide (7) and generate buoyancy, so that the negative type cleaning agent (20) floats on the surface of the water. The carbonate may include at least one selected from the group consisting of sodium hydrogencarbonate, potassium carbonate, sodium carbonate, calcium carbonate, ammonium carbonate and magnesium carbonate, and the organic acid may be at least one selected from ascorbic acid, succinic acid, tartaric acid, And at least one selected from the group consisting of fumaric acid or fumaric acid salt (21). At this time, potassium carbonate as a carbonate and citric acid as an organic acid can be preferably used. However, the carbonate and the organic acid are not necessarily limited to those described above, and include all known materials as long as they can react with each other to release the carbon dioxide 7.

At this time, the combined weight of carbonate and organic acid may be 30 to 55% (w / w) based on the total weight of the negative type cleaning agent 20. This is an optimum amount that can ensure the floating property of the negative type cleaning agent 20, and can be determined according to the component of the negative type cleaning agent 20, the state of the groundwater 1 and the like within the range.

On the other hand, in order to have floating property, it is necessary to appropriately select the mixing ratio of carbonate and organic acid.

In addition, the negative-type cleaning agent 20 has a slow-releasing effect of gradually releasing the fumaric acid or fumaric acid salt 21 to the groundwater 1 for a predetermined period of time, and may further include a sustained-release polymeric material. When the sustained release polymeric material is contained in the negative type cleaning agent 20, the fumaric acid or fumaric acid salt can be continuously released over a period of 24 hours or more.

At this time, the sustained-release polymer material used may include at least one selected from the group consisting of hydroxypropylmethylcellulose, hydroxymethylcellulose, and hydroxyethylcellulose. However, the material is not necessarily limited thereto.

Here, the elution rate of fumaric acid or fumaric acid salt (21) can be limited depending on the content of the sustained-release polymer material.

The sedimentation type purifying agent 30 is disposed at the bottom of the groundwater 1 while the subtype purifying agent 20 floats on the water surface of the groundwater 1 in the vessel 10.

The sedimentation type purifying agent 30 is a purifying agent for removing nitrate nitrogen in the groundwater 1, similarly to the above-described subtype purifying agent 20, and is formed in the form of a solid tablet having hard solidity and a uniform shape.

The precipitating type purifying agent 30 contains fumaric acid or fumaric acid salt 31 as an organic carbon source wherein the fumaric acid or fumaric acid salt 31 is contained in an amount of 30 to 70% ) ≪ / RTI > by weight. If the fumaric acid or fumaric acid salt (31) is contained in an excess amount, the microorganisms may overproduce, causing the hollow micropores (11) to be clogged and causing water pollution. Conversely, if too small, the efficiency of removing nitrogenous nitrogen is low. do. Here, the precipitating-type cleaning agent 30 may further include excipients, binders, disintegrants, lubricants, and the like used in addition to fumaric acid or fumaric acid salt (31).

In addition, since the sedimentation type cleaning agent 30 also has a slow effect, it may further include the above-described sustained-release polymer material. In this regard, the same is the same as the sustained release polymer material of the negative type cleaning agent 20 described above, and a detailed description thereof will be omitted.

The sedimentation-type purifying agent 30 may further include a position adjusting agent since it is deposited on the water bottom of the groundwater 1 flowing into the vessel 10. Here, the position adjusting agent increases the density of the sedimentation type purifying agent 30 and sinks the sedimentation type purifying agent 30 to the bottom of the groundwater 1 in the vessel 10. At this time, the position controlling agent used may be sodium metasilicate (Na ₂ SiO ₃ ), dicalcium phosphate, bentonite, sand, and the like. Particularly, when the sand is contained in the sedimentation-type cleaning agent 30, the sediment is deposited on the underwater floor of the groundwater 1, so that fumaric acid or fumaric acid salt 31 is continuously discharged to remove nitrate nitrogen from the bottom of the water.

Here, the weight of the position adjusting agent may be 25 to 55% (w / w) based on the total weight of the sedimentation type purifying agent 30, and the amount thereof may be determined based on the condition of the groundwater 1 and the degree of contamination.

On the other hand, the underwater floor of the groundwater 1 may be the bottom surface of the groundwater passage, or the bottom surface of the tunnel 10. That is, when the end of the duct 10 disposed on the side of the groundwater flow path is opened, the end thereof is stuck on the bottom surface of the groundwater flow path, so that the bottom of the groundwater 1 at this time becomes the bottom surface of the groundwater flow path. On the other hand, when the distal end of the tub 10 is closed, the settling type cleaning agent 30 is disposed on the bottom surface closing the distal end, so that the bottom of the groundwater 1 becomes the bottom surface of the tub 10 (Not shown).

The subtype purifying agent 20 and the sedimentation type purifying agent 30 are generated by the purifying agent supply device 5 and supplied to the groundwater 1 in the well 10. In this case, since the groundwater 1 has a considerably different flow velocity or depth in each region, the injected fumaric acid or fumaric acid salt 21, 31 rapidly migrates out of the radius of influence It is necessary to increase the injection time or the injection amount. On the other hand, in the case of a region with a low flow rate, the injected fumaric acid or fumaric acid salt (21, 31) may remain within the influence radius for a long time.

In general, according to the present invention, the water surface of the groundwater (1) introduced into the hollow tubular well (10) inserted from the ground surface (3) to the ground water channel, and the water surface which emits fumaric acid or fumaric acid salts By disposing the slow-acting purifying agent, fumaric acid or fumaric acid salts (21, 31) are continuously discharged for a long time to remove nitrate nitrogen, thereby simultaneously removing contamination from the water surface and underwater floor. The amount of fumaric acid or fumaric acid salt 21, 31 of the slow-acting cleaning agent disposed in the vessel 10 is effectively controlled depending on the flow rate, depth and degree of contamination of the groundwater 1, May be prevented from clogging the micro-perforations 11 of the tube 10 into which they are introduced. Furthermore. Since the slow-acting cleaning agent is disposed in the vessel 10 in the form of a solid tablet, it is easier to store and manage the electron donor, such as a conventional formate, than to inject the electron donor in a liquid phase. It is possible to construct a facility with a simple installation and low cost.

A plurality of groundwater reduction systems according to the present invention are arranged along the flow direction of the groundwater so that the groundwater 1 continuously passes through the nitrate acid reduction system according to the present invention along the flow path of the groundwater, Can be effectively refined.

3 is a cross-sectional view illustrating a nitrate nitrogen reduction system for groundwater according to another embodiment of the present invention.

3, the system for reducing nitrate nitrogen of groundwater according to the present invention further includes a filter 40 to block the inflow of soil or foreign matter 9 through the micro-perforations 11 . The filter paper 40 is fine sand and acts as a filter so that the soil or the foreign matter 9 which is disposed on the outer surface of the well 10 on which the micro-perforations 11 are formed and can be introduced together with the ground water 1, . The canopy 10 is inserted into a hole formed by excavating the soil. At this time, a clearance is formed between the excavated hole and the canopy 10, so that the canopy 10 is fixed by filling the canopy with the canopy. Here, the filtration yarn 40 is received in the sand pack and disposed around the filtration tank 10, thereby preventing the inflow of the soil or foreign matter 9 into the filtration tank 10. On the other hand, when the sand pack is filled, grouting with bentonite or the like from the upper part can be performed to improve the ground in which the vessel 10 is inserted, and to prevent water leakage.

Through the following experiments, it is confirmed whether or not the nitrate nitrogen reduction system according to the present invention is implemented.

4 is a graph showing the degree of release of fumaric acid or fumaric acid salt depending on elution time in the case of containing different amounts of sustained release polymeric substances. Fig. 5 is a graph showing the release of fumaric acid or fumaric acid salt This graph shows the degree of salt release.

First, an experiment was conducted to confirm whether the negative type cleaning agent has floating property through the reaction between carbonate and organic acid. At this time, calcium carbonate was used as the carbonate and citric acid as the organic acid, and the masses of the other components were kept the same while the masses of the other components were kept the same.

The results are shown in Table 1 below.

Ingredients
(Mg) refine One 2 3 4 5 Carbon source 500 500 500 500 500 Hydroxyphenyl methyl cellulose
(HPMC) 400 400 400 400 400 The binder (MCC) 100 100 100 100 100 Citric acid 20 50 100 200 400 Calcium carbonate 2 12.5 25 50 100 all 1125 1162.5 1225 1350 1600 Affluence X X X X ○

Analysis of the above results shows that the same mass of element is used for each tablet, and even if the mixing ratio of citric acid and calcium carbonate is the same, whether or not to float depends on the weight of each of citric acid and calcium carbonate with respect to the total weight of the total negative type cleaning agent . At this time, the weight of the carbon source relative to the total weight was about 31.25%, and the total weight of citric acid and calcium carbonate was about 31.25% of the total weight.

In FIG. 4, experiments were carried out to examine how the mass of the sustained-release polymer material affects the release of fumaric acid or fumaric acid salts. This dissolution experiment was carried out under the batch condition. Hydroxyphenyl methyl cellulose (HPMC) was used as the sustained release polymer material, and the mass and the mass of the remaining tablets were the same. Specifically, as shown in the following Table 2, the HPMC mass of the first tablet was 50 mg, the HPMC mass of the second tablet was 100 mg, the HPMC mass of the third tablet was 200 mg, and the HPMC mass of the fourth tablet was 300 mg Respectively.

Ingredients
refine One 2 3 4 Fumarate (mg) 500 500 500 500 Sand (㎎) 400 400 400 400 Hydroxyphenyl methyl cellulose
(HPMC) (mg) 50 100 200 300 The binder (MCC)
(Mg) 300 300 300 300 Total (mg) 1250 1300 1400 1500 The hardness of the tablet (N) 135.7 178.8 221.8 278.8 content (%) 108.4 111.2 107.1 100.9 PH after elution test > 6 > 6 > 6 > 6

As a result, it was confirmed that the larger the mass of HPMC, the larger the hardness and the more slowly fumaric acid or fumaric acid salt was released. Therefore, it can be seen that the elution time can be controlled by adjusting the amount of HPMC. At this time, the amount of HPMC does not affect the pH after elution.

In FIG. 5, in order to confirm the dissolution rate with increasing density in the case of the precipitating type cleaning agent, the dissolution rate in the case of containing sodium metasilicate (Na ₂ SiO ₃ ), dicalcium phosphate and sand was confirmed. In this case, 400 mg of sodium metasilicate, 600 mg of sodium metasilicate as the first tablet, 400 mg of dicalcium phosphate as the third tablet, 400 mg of the fourth tablet, 200 mg of the second tablet, The tablets contain 600 mg of sand. More specific components and masses are shown in Table 3 below.

division
Constituent material
refine One 2 3 4 5 6 chief ingredient Fumarate 500 500 500 500 500 500
Density increase
Na ₂ SiO ₃ 400 600 Dicalcium phosphate 400 sand 400 200 600 Binder MCC 100 100 100 100 100 100 Total amount (mg) 1000 1200 1000 1000 800 1200

As a result, it was found that the dissolution rate was controlled by the type and mass of the position controlling agent used for increasing the density. In particular, when the sand is used, the elution speed is very fast. In the case of the sand weight of 25-40% (fourth and fifth tablets), the elution rate is about 100% after about 6 hours, %, The elution after 60 hours was about 60%. As a result, it can be seen that, by controlling the mass of the sand, the rate of elution and the amount of elution can be controlled.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: groundwater 3: indicator
5: Purifying agent supply device 7: Carbon dioxide
10: Jangjeong 11: Micro-perforation
20: Subtype cleansing agent 21, 31: Fumaric acid or fumaric acid salt
30: Settling type cleaning agent 40: Filter

Claims (11)

And the groundwater is introduced into the groundwater flow path from the surface of the groundwater pipe.
Wherein the fumaric acid or fumaric acid salt is suspended in the water surface of the groundwater flowing into the canal and continuously discharges fumaric acid or fumaric acid salt for a predetermined time to remove nitrate nitrogen in the ground water Negative-type cleaning agents; And
Wherein the fumaric acid or fumaric acid salt is formed in the form of a tablet containing fumaric acid or fumaric acid salt and is precipitated on the water floor of the groundwater introduced into the canal and continuously discharges the fumaric acid or fumaric acid salt for a predetermined time to remove the nitrate nitrogen Typical cleaning agents;
Lt; / RTI >
The subtype purifying agent
lead carbonate; And
An organic acid which reacts with the carbonate to generate carbon dioxide to generate buoyancy;
Wherein the carbon dioxide is released into the water of groundwater and floated with repulsive force.
The method according to claim 1,
Wherein the micropore is penetrated through the outer surface of the tube disposed in the groundwater channel so that the groundwater flows in.
The method of claim 2,
A filter disposed on an outer surface of the conduit for blocking inflow of the soil through the microperforations;
Further comprising a nitrate nitrogen reduction system for groundwater.
The method according to claim 1,
Wherein the weight of the fumaric acid or fumaric acid salt is 30 to 70% (w / w) based on the total weight of the sub-type purifying agent or the sedimentation type purifying agent, respectively.
delete The method according to claim 1,
Wherein the total weight of the carbonate and the organic acid is 30 to 55% (w / w) based on the total weight of the subtype purifier.
The method according to claim 1,
The subtype purifying agent, and the sedimentation type purifying agent,
A sustained release polymeric material such that the fumaric acid or fumaric acid salt is continuously released;
Further comprising a nitrate nitrogen reduction system for groundwater.
The method of claim 7,
The sustained release polymer material
Wherein the system comprises at least one member selected from the group consisting of hydroxypropylmethylcellulose, hydroxymethylcellulose, and hydroxyethylcellulose.
The method according to claim 1,
The sedimentation type cleaning agent
A location adjuster to settle on the underwater floor of the groundwater;
Further comprising a nitrate nitrogen reduction system for groundwater.
delete The method of claim 9,
Wherein the weight of the position adjusting agent is 25 to 55% (w / w) based on the total weight of the sedimentation type cleaning agent.

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