JP2002143811A - Decomposition system for pollutant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out bioremediation without the occurrence of water contamination. SOLUTION: The decomposition system 1 for pollutants is constituted by covering a ground level with concrete 2 which is an impermeable material, forming its top surface as a pair of working surfaces 4 and 4 laid and leveled off with contaminated soil 3 which is the pollutant, providing these working surfaces with a grade for water collection, providing the downstream side of the grade for water collection with a catch basin 5 and providing the catch basin with a water storage pit 6 which is a water storage means for storing the water collected in the catch basin. The system is provided with a monitoring apparatus 7 for monitoring the quality of the water stored in the storage pit 6. The water storage pit is communicated and connected with and to a sprinkler system 8 through piping 13. The exudate from the contaminated soil 3 collected in the catch basin 5 and stored in the water storage pit 6 is monitored by the monitoring apparatus 7 and is sprinkled to the contaminated soil 3 by the sprinkler system 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for decomposing various harmful substances such as oil and organic chlorine compounds contained in contaminated soil, industrial waste, sludge and the like by bioremediation.

[0002]

2. Description of the Related Art When foundation work is performed at a site of a factory or the like, fuel oil or machine oil may be carried out in a mixture with excavated soil.
In addition, a situation is conceivable in which oil spills out due to some accident and the surrounding ground is contaminated with the oil.

If the contaminated soil is left as it is, the oil contained in the soil is volatilized and diffuses to the surroundings, hindering the living of the surrounding inhabitants. It may be mixed with groundwater to cause water pollution. Therefore, for soil contaminated with oil, it is necessary to remove oil by, for example, incineration to prevent diffusion into the environment.

[0004] The soil on the site of the factory may contain organochlorine compounds such as trichloroethylene and tetrachloroethylene, which are carcinogenic substances. If such soil is left as it is, it will also come through groundwater and the like. Organochlorine compounds may diffuse into the environment and, like oil contaminated soil, must be subjected to a predetermined purification treatment.

On the other hand, recently, a technology for decomposing and detoxifying pollutants in the environment by utilizing the activity of microorganisms, that is, research on bioremediation, has been advanced. The application of is also being studied.

[0006] Bioremediation is a method of decomposing and detoxifying contaminants by utilizing the decomposing ability of microorganisms such as bacteria and fungi. -By improving the activity of microorganisms by adjusting the environment such as nutrition and ventilation, it is possible to decompose pollutants more efficiently than in the natural state.

[0007]

The method for treating contaminants using such microorganisms has been confirmed to have achieved certain results at the laboratory level, and practical measures are expected to be greatly enhanced in the future.

However, when water is sprinkled or nutrients are added to the contaminated soil so that the environment inside the contaminated soil is suitable for the activity of decomposing microorganisms, water absorbed into the contaminated soil due to watering or rainfall is not contained in the contaminated soil. Both contaminants and nutrients such as added nutrients penetrate into the groundwater system in the surrounding ground, causing a problem of causing water pollution.

The present invention has been made in view of the above circumstances, and has as its object to provide a pollutant decomposition system capable of performing bioremediation without causing water pollution.

[0010]

In order to achieve the above object, a pollutant decomposition system according to the present invention is characterized in that a pollutant containing a pollutant such as an oil or an organic chlorine compound is contained in the pollutant. In a pollutant decomposition system that decomposes and removes the contaminants by performing bioremediation on the ground surface, the top surface is coated with a water-impermeable material, and the upper surface is used as a work surface on which the contaminants are spread and leveled. The work surface is provided with a water collecting gradient, a water collecting groove is provided downstream of the water collecting gradient, and a water storage means for storing water collected in the water collecting groove is provided.

In the pollutant decomposition system according to the present invention, the water collecting groove is provided with a drainage gradient along a longitudinal direction, and the water storage means is provided with a water storage pit provided downstream of the drainage gradient. It was done.

Further, in the pollutant decomposition system according to the present invention, the water storage means is constituted by a water storage tank provided on the ground, a drain pipe is laid in the water collecting groove, and the drain pipe is provided with a predetermined drain. It is connected to the water storage tank via a pump.

[0013] Further, the pollutant decomposition system according to the present invention includes a monitoring device for monitoring the quality of water stored in the water storage means.

[0014] In the pollutant decomposition system according to the present invention, a predetermined water spray device is connected to the water storage means so that the contaminant can be watered from the water spray device.

In order to properly decompose and detoxify the contaminants in the contaminants by bioremediation, it is necessary to maintain the contaminants in an environment suitable for the activity of decomposing microorganisms.

Therefore, in the present invention, as in the conventional case, it is necessary to sprinkle water on the contaminant as needed to maintain the water content in the contaminant at about 10%, for example. The surface is coated with a water-impermeable material and the upper surface is used as a work surface on which contaminants are spread and leveled, and the work surface is provided with a water collecting gradient, and a water collecting groove is provided downstream of the water collecting gradient. In addition, a water storage means for storing water collected in the water collecting groove is provided.

Therefore, water absorbed into the contaminants by water spraying or rainfall flows down on the work surface, which is the upper surface of the water-impermeable material, toward the downstream side of the water collecting gradient, and is collected by the water collecting groove. It is watered and stored in water storage means.

Therefore, even if contaminants, intermediate products by decomposing bacteria or nutrients for enhancing the decomposition activity are leached from the contaminated material due to watering or rainfall, such leached components penetrate into the ground and are discharged into the groundwater. There is no danger of spreading into the system.

As the microorganism used for the bioremediation, bacteria, in particular, bacteria naturally existing in soil, indigenous bacteria such as actinomycetes, etc. can be used.

Examples of the pollutants include oils, organic chlorine compounds such as trichloroethane, trichloroethylene and PCB, aromatic hydrocarbons such as benzene, toluene, naphthalene and phenol, and all other substances which can be decomposed by microorganisms. Is subsumed.

The contaminants containing contaminants are mainly contaminated soil, but also include industrial waste such as slag, incinerated ash, sludge, concrete waste, plastic waste, and waste wood.

The spread of the contaminants does not only mean the spread with the same thickness, but also includes, for example, the spread of ridges or the spread of embankments.

The water-impermeable material may be made of any material as long as it can prevent water leached from contaminants from flowing into the groundwater system, such as concrete and water-impermeable vinyl. It is conceivable to use a sheet or the like. Here, when the water-impermeable material is concrete, the upper surface of the concrete is the work surface.

The construction of the gradient for collecting water is optional. For example, a flat ground may be coated with a water-impermeable material so as to have a gradient, or a sloped ground may be coated with a water-impermeable material. It is conceivable to use the slope of the sloping land as it is as the slope for collecting water.

The water collecting groove is provided on the downstream side of the water collecting slope, and any structure can be used as long as the water flowing down on the work surface can be collected. It is conceivable that a groove is formed in the groove to cover the inner surface of the groove with a water-impermeable material, or a U-shaped groove used in a road-side groove is diverted as a water collecting groove. It is desirable to fill the inside of the groove with a clogging preventive material such as gravel or pebbles to prevent clogging.

The water storage means may be arbitrarily configured as long as the water collected in the water collecting groove can be stored therein. For example, the water collecting means may include a drainage gradient along the longitudinal direction in the water collecting groove. And a water storage pit may be provided downstream of the drainage gradient to serve as a water storage means.

In such a case, the water collected in the water collecting groove flows down the water collecting groove toward the downstream side of the drainage gradient, and is stored in the water storage pit. Therefore, water can be stored in the water storage means only by natural force without requiring artificial power.

Further, the water storage means may be constituted by a water storage tank provided on the ground, a drain pipe may be laid in the water collecting groove, and the drain pipe may be connected to the water storage tank via a predetermined drain pump.

In such a case, the water collected in the water collecting channel is drained by a drain pump through a drain pipe and stored in a water storage tank. Therefore, it is possible to store the water collected in the water collecting trench without excavating the ground.

The drainage pipe may be of any configuration as long as the water collected in the drainage channel smoothly flows into the hollow interior of the drainage pipe. It is possible to form a hollow tube made of plastic. Also, the way of laying drainage pipes is optional,
For example, in order to prevent clogging, it is conceivable to lay in the groove while being surrounded by a clogging prevention material such as gravel or pebbles.

The drain pump may have any configuration as long as it can drain the water collected in the water collecting channel through a drain pipe and store it in a water storage tank.

As described above, the water stored in the water storage means may contain contaminants, intermediate products of decomposing bacteria, nutrients for enhancing the decomposing activity, and the like. May be appropriately discharged as necessary, and then discharged to a river or the like.However, when a monitoring device for monitoring the quality of the water stored in the water storage means is provided, the water stored in the water storage means may be used. The content of nutrients, air, microorganisms, etc. of the waste water is monitored as needed, and the water leaching from the contaminants is analyzed.

In this way, the progress of bioremediation performed in the contaminant can be constantly grasped, and more appropriate bioremediation, such as adding a nutrient to the contaminant as necessary, can be performed. It is possible to do.

The monitoring device may have any configuration as long as it can analyze the contents of nutrients, air, microorganisms and the like of the water stored in the water storage means.

The water stored in the water storage means may be appropriately treated as necessary and then discharged to a river or the like. Here, a predetermined water sprinkler is connected to the water storage means, and In the case where the water sprinkling device is configured to be able to water the contaminants, the water stored in the water storage means is sprinkled from the water sprinkling device to the contaminants, and the water for watering is circulated and reused. It becomes possible.

[0036] Therefore, the amount of water used to sprinkle the contaminants during the bioremediation can be saved, and the processing work required to release the water necessary for discharging to rivers or the like is not required. Thus, the work can be reduced.

The water sprinkling device may be of any configuration as long as the water stored in the water storage means can be sprinkled onto the contaminants. It is conceivable to connect and configure a pump for this purpose.

Here, a monitoring device for monitoring the quality of the water stored in the water storage means is provided, and a predetermined water spray device is connected to the water storage means so that water can be sprayed from the water spray device to contaminants. In such a case, the water exuding from the contaminants is stored in the water storage means, and nutrients, air, microorganisms, etc. of the water stored in the water storage means are analyzed by the monitoring device, and the analysis result is obtained. And then sprinkle the contaminants with a sprinkler.

That is, according to the water quality analysis by the monitoring device, for example, when the nutrients are insufficient and the decomposition activity of the decomposing bacteria is reduced or is expected to be reduced, the nutrients are appropriately added to the water in the water storage means. By spraying water onto contaminants, it is possible not only to circulate and reuse water for watering, but also to maintain the nutrient content in contaminants at an appropriate value. Become.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pollutant decomposition system according to the present invention will be described below with reference to the accompanying drawings. It is to be noted that the same reference numerals are given to components and the like that are substantially the same as those in the conventional technology, and description thereof will be omitted.

(First Embodiment)

FIG. 1 is a sectional view showing a pollutant decomposition system 1 according to the first embodiment, and FIG. 1B is a sectional view taken along the line AA in FIG. As shown in the figure, in a pollutant decomposition system 1 according to the present embodiment, the ground surface is covered with concrete 2 which is a water-impermeable material, and the upper surface thereof is spread with contaminated soil 3 which is a contaminant. A pair of work surfaces 4 and 4 are provided, and a gradient for collecting water is provided on the work surfaces, and a water collecting groove 5 is provided on the downstream side of the water collecting gradient, and water collected in the water collecting groove is stored. A water storage pit 6 is provided as a water storage means.

The contaminated soil 3 contains contaminants to be decomposed by bioremediation. here,
Pollutants include oils, organochlorine compounds such as trichloroethane, trichloroethylene, and PCB, aromatic hydrocarbons such as benzene, toluene, naphthalene, and phenol, and all substances that can be decomposed by microorganisms. Become.

The work surfaces 4, 4 are places for spreading the contaminated soil 3 and are arranged in a plane so as to sandwich the water collecting groove 5 from both sides, and the water collecting groove 5 is on the downstream side. The slope for collecting water is attached as shown.

As shown in FIG. 1 (b), the water collecting groove 5 is provided on the downstream side of the water collecting slope provided on the work surfaces 4, 4, and the contaminated soil 3 is contaminated by water or rain. When the water containing nutrients oozes out, the leaching water flows down on the work surfaces 4, 4, and can be collected at a position substantially below the center of the contaminated soil 3. In addition, the catchment ditch 5 has
As can be clearly seen in (a), a drainage gradient is provided along the longitudinal direction, so that water collected in the water collecting groove 5 can be drained downstream of the drainage gradient to be drained. . The inner surface of the water collecting groove 5 is covered with concrete 2 which is an impermeable material, and the inside of the groove is filled with gravel 9 which is an anti-clogging material to prevent clogging.

The water storage pit 6 is formed by excavating the ground on the downstream side of the drainage slope provided in the water collecting groove 5 so that the water collected in the water collecting groove 5 can be stored therein. .

Here, the pollutant decomposition system 1 according to the present embodiment includes a monitoring device 7 for monitoring the quality of the water stored in the water storage pit 6, and connects the water storage pit via a pipe 13. And a spilled water from the contaminated soil 3 collected in the water collecting groove 5 and stored in the water storage pit 6 by the monitoring device 7.
And water is sprinkled on the contaminated soil 3 by the sprinkler 8.

The monitoring device 7 can analyze the content of nutrients, air, microorganisms, etc. of the water stored in the water storage pit 6.

The water sprinkling device 8 comprises a water sprinkling pipe 11 provided with a large number of water sprinkling holes 10 so as to face the contaminated soil 3, and a water sprinkling pump 12 connected to the water sprinkling pipe. Here, the above-mentioned pipe 13 is connected to the supply side of the watering pump 12, and the water stored in the water storage pit 6 is conveyed through the watering hole 10 provided in the watering pipe 11 via the watering pump 12 to the contaminated soil 3. You can sprinkle water.

In the pollutant decomposition system 1 according to the present embodiment, first, a drain slope is formed on the surface of the ground, and slopes corresponding to the water collection slope are formed on both sides thereof. Next, concrete 2 is coated on the inner surface of the groove and the slopes formed on both sides thereof to form work surfaces 4 and 4 and water collecting groove 5.

Next, after the gravel 9 is filled in the water collecting groove 5, the contaminated soil 3 containing contaminants is spread on the work surfaces 4, 4 in a ridge shape, for example. It is necessary to add microorganisms that decompose pollutants, their nutrients, or moisture to the contaminated soil 3, which may be performed at the time of spreading or before or after spreading. You may do so.

As the microorganism used for the bioremediation, bacteria, in particular, bacteria naturally existing in soil, and indigenous bacteria such as actinomycetes can be used.

Next, in this state, the contaminated soil 3 is left for a certain period to perform bioremediation. In order to properly decompose and detoxify the contaminants in the contaminated soil 3 by bioremediation, the inside of the contaminated soil 3 must be removed. It is necessary to maintain an environment suitable for microbial decomposition activity.

Therefore, in the present embodiment, similarly to the conventional case, it is necessary to sprinkle water on the contaminated soil 3 as needed to maintain the water content in the contaminated soil 3 at, for example, about 10%. In the above, the water absorbed into the contaminated soil 3 by watering or rainfall flows down on the work surfaces 4 and 4 which are the upper surfaces of the concrete 2 together with the pollutants and nutrients toward the downstream side of the water collecting gradient. , After the water is collected in the water collecting groove 5,
It flows down the catchment channel 5 toward the downstream side of the drainage gradient,
It is stored in the water storage pit 6.

Next, the content of nutrients, air, microorganisms, etc. of the water stored in the water storage pit 6 is analyzed by the monitoring device 7, and the nutrients, etc. are added to the stored water according to the analysis result. After that, the water stored in the water storage pit 6 is sprayed through the water spray pump 12 to the water pipe 1.
Sprinkle water on contaminated soil 3 from 1.

The water sprinkled on the contaminated soil 3 is collected again in the water collecting channel 5 together with contaminants and nutrients.
In the same manner, the above steps are repeated as necessary.

As described above, according to the pollutant decomposition system 1 according to the present embodiment, the water oozing out of the contaminated soil 3 is collected in the water collecting groove 5 and stored in the water storing pit 6. Therefore, even if contaminants, intermediate products due to decomposing bacteria or nutrients for enhancing decomposition activity are leached from the contaminated soil 3 due to watering or rainfall, such leached components penetrate into the ground and enter the groundwater system. There is no risk of spreading.

Further, according to the pollutant decomposition system 1 of the present embodiment, the water collecting groove 5 is provided with a drainage gradient, and the water storage means is constituted by the water storage pit 6 provided on the downstream side of the drainage gradient. In addition, the water can be stored in the water storage pit 6 only by natural power without requiring artificial power.

Further, according to the pollutant decomposition system 1 according to the present embodiment, the water stored in the water storage pit 6 is sprinkled on the contaminated soil 3 by the water spray device 8 and collected again in the water storage pit 6. Therefore, water for watering can be circulated and reused.

Therefore, the amount of water used to sprinkle the contaminated soil 3 during the bioremediation can be reduced, and the processing work required to release the water necessary for discharging the water into rivers or the like is performed. It becomes unnecessary and the work can be reduced.

Further, according to the pollutant decomposition system 1 of the present embodiment, since the monitoring device 7 and the water sprinkling device 8 are provided, the monitoring device 7 performs the water quality analysis in the contaminated soil 3. It is possible to always grasp the progress of bioremediation and, for example, when nutrients are insufficient and the decomposition activity of the degrading bacteria is reduced or expected to decrease, nutrients are appropriately stored in the water storage pit 6. It is possible to water the contaminated soil 3 after adding it to the water, and not only can the water for watering be circulated and reused, but also the content of nutrients in the contaminated soil 3 can be adjusted appropriately. It is also possible to maintain an appropriate value.

In the present embodiment, the contaminant containing the contaminant is used as the contaminated soil 3, but instead of the contaminated soil, industrial waste such as slag, incinerated ash, sludge, concrete waste, plastic waste, and waste wood is used. The present invention may be applied.

In this embodiment, a pair of work surfaces 4,
Although the water collecting groove 5 is arranged between the four, the construction of the work surface and the water collecting groove is not limited to this, and for example, a naturally existing slope is coated with a water-impermeable material and its upper surface is formed. May be used as a work surface, and the slope of the sloped land may be used as it is as a water collection gradient, and a water collecting groove may be provided along an end of the work surface on the downstream side of the water collection gradient. .

In this embodiment, the work surfaces 4 and 4 are provided with slopes for collecting water by forming a slope on the ground. Instead, the work surfaces 4 and 4 are formed on a flat ground surface. A concrete body provided with a slope may be installed, and its upper surface may be used as a work surface.

In this embodiment, the water quality analysis is performed by providing the monitoring device 7. However, when it is known that a predetermined effect by bioremediation can be obtained by the initially added amount of nutrients and the like. , The monitoring device 7 may be omitted.

In the present embodiment, the water spraying device 8 is provided to reuse the stored water as water for watering. However, there is no need for watering, for example, it is possible to sufficiently expect hydration by rainfall. In this case, the sprinkling device 8 may not be provided. In such a case, a predetermined treatment device may be connected to the water storage pit 6, and the water stored in the treatment device may be appropriately treated and then discharged to a river or the like.

(Second Embodiment)

Next, a pollutant decomposition system according to a second embodiment will be described with reference to the accompanying drawings. Note that components that are substantially the same as those in the first embodiment are given the same reference numerals, and descriptions thereof are omitted.

FIG. 2 is a sectional view showing a pollutant decomposition system 21 according to the second embodiment, and FIG. 2 (b) is a sectional view taken along the line BB of FIG. 2 (a). As shown in the figure, in a pollutant decomposition system 21 according to the present embodiment, the ground surface is covered with concrete 2 which is a water-impermeable material, and the upper surface thereof is spread with contaminated soil 3 which is a contaminant. A pair of work surfaces 4 and 4 are provided, and a gradient for water collection is formed on the work surfaces. A water collecting groove 22 is provided on the downstream side of the water collecting gradient, and a drain pipe 23 is laid in the water collecting groove. The drain pipe is connected to a water storage tank 25 as a water storage means via a drain pump 24.

As can be seen from FIG.
It is provided on the downstream side of the water collecting gradient attached to the work surfaces 4, 4, and when water containing pollutants and nutrients oozes out of the contaminated soil 3 due to sprinkling or rainfall, the leachate is transferred to the work surfaces 4, 4 The contaminated soil 3 can be collected at a position substantially below the center of the contaminated soil 3. Note that the inner surface of the water collecting groove 5 is covered with concrete 2 which is an impermeable material.

The drainage pipe 23 is laid in the water collecting groove 22 in a state surrounded by the gravel 9 which is a clogging prevention material, as can be clearly understood from the detailed sectional view shown in FIG.

Here, the drain pipe 23 is connected to the water collecting groove 2 described above.
2 is constituted by a hollow tube provided with a number of holes 26 so that the water collected in 2 can smoothly flow into the internal hollow space 27, and the drain side thereof communicates with the supply side of the drain pump 24. Connected. The drain pipe 23 can be made of, for example, hard vinyl chloride or a plastic material.

The drain pump 24 drains water from the contaminated soil 3 through a drain pipe 23, and pumps the water through a pipe 28 so that the water can be stored in a water storage tank 25. is there.

The water storage tank 25 is provided on the ground so that the water collected by the water collecting groove 22 can be stored therein.

Here, the pollutant decomposition system 21 according to the present embodiment is provided with the monitoring device 7 for monitoring the quality of the water stored in the water storage tank 25, as in the first embodiment. The water storage tank is connected to the water sprinkling device 8, and the seepage water from the contaminated soil 3, which is pumped through the drainage pump 24 and the pipe 28, is monitored by the monitoring device 7, and the leachate is discharged to the water sprinkling device 8. To sprinkle water on the contaminated soil 3.

The monitoring device 7 can analyze the content of nutrients, air, microorganisms, etc. of the water stored in the water storage tank 25 as in the first embodiment.

As in the first embodiment, the watering device 8 is a watering pipe 1 provided with a large number of watering holes 10 so as to face the contaminated soil 3.
1 and a watering pump 12 connected to the watering pipe. Here, the supply side of the watering pump 12 is a water tank 25.
The water stored in the water storage tank 25 can be sprinkled onto the contaminated soil 3 from the water sprinkling hole 10 provided in the water sprinkling pipe 11 via the water sprinkling pump 12.

In the pollutant decomposition system 21 according to the present embodiment, first, a groove is formed on the surface of the ground, and a slope corresponding to a gradient for collecting water is formed on both sides of the groove. Next, concrete 2 is coated on the inner surface of the groove and the slopes formed on both sides thereof to form work surfaces 4 and 4 and water collecting groove 22.

Next, a drain pipe 23 is laid in the water collecting groove 22. When laying the drain pipe 23, the periphery thereof is surrounded by the gravel 9.

Next, the contaminated soil 3 containing the contaminants is spread on the work surfaces 4 and 4, for example, in a ridge shape. It is necessary to add microorganisms that decompose pollutants, their nutrients, or moisture to the contaminated soil 3, which may be performed at the time of spreading or before or after spreading. You may do so.

Next, in this state, the contaminated soil 3 is left for a certain period to perform bioremediation. In order to properly decompose and detoxify the contaminants in the contaminated soil 3 by bioremediation, the inside of the contaminated soil 3 must be removed. It is necessary to maintain an environment suitable for microbial decomposition activity.

Therefore, in the present embodiment, similarly to the related art, it is necessary to sprinkle water on the contaminated soil 3 as needed to maintain the water content in the contaminated soil 3 at, for example, about 10%. In the above, the water absorbed into the contaminated soil 3 by watering or rainfall flows down on the work surfaces 4 and 4 which are the upper surfaces of the concrete 2 together with the pollutants and nutrients toward the downstream side of the water collecting gradient. After being collected in the water collecting groove 22, the water is drained by a drain pump 24 through a drain pipe 23 laid in the water collecting groove 22, and stored in a water storage tank 25.

Next, the contents of nutrients, air, microorganisms, etc. of the water stored in the water tank 25 are analyzed by the monitoring device 7, and the nutrients, etc. are added to the stored water according to the analysis result. Etc., and then the water tank 25
The water stored inside is sprayed through a watering pump 12 through a watering pipe 11.
From the sprinkled soil 3

The water sprinkled on the contaminated soil 3 is collected again in the water collecting groove 22 together with contaminants and nutrients, and the above steps are repeated as necessary.

As described above, according to the pollutant decomposition system 21 according to the present embodiment, similarly to the first embodiment, the water oozing out of the contaminated soil 3 is collected in the water collecting groove 22 and the water storage tank. 25, the contaminants, intermediate products by decomposing bacteria or nutrients for enhancing the decomposing activity are leached from the contaminated soil 3 due to watering and rainfall. There is no danger of seepage into the groundwater system.

Further, according to the pollutant decomposition system 21 according to the present embodiment, the water storage tank 2 provided with water storage means on the ground is provided.
5 and the drain pipe 23 was laid in the water collecting groove 22 and the drain pipe was connected to the water storage tank 25 via the drain pump 24 and the pipe 28, so that the ground was excavated to secure a water storage space. No need to do.

Further, according to the pollutant decomposition system 21 of the present embodiment, the water storage tank 25 is provided similarly to the first embodiment.
The water stored therein is sprinkled on the contaminated soil 3 by the sprinkling device 8 and collected again in the water storage tank 25, so that the water for sprinkling can be circulated and reused.

Therefore, the amount of water used to sprinkle the contaminated soil 3 during the bioremediation can be saved, and the processing work required to release the water necessary for discharging to rivers and the like is performed. It becomes unnecessary and the work can be reduced.

Further, according to the pollutant decomposition system 21 of the present embodiment, the monitoring device 7 and the water sprinkling device 8 are provided as in the first embodiment. In addition to being able to constantly grasp the progress of the bioremediation that is performed in 3, when, for example, nutrients are insufficient and the decomposition activity of the degrading bacteria is reduced or is expected to decrease,
After adding nutrients to the water in the water tank 25 as appropriate, the contaminated soil 3
Not only water can be circulated and reused, but also contaminated soil 3
It is also possible to maintain the content of nutrients in the plant at an appropriate value.

In this embodiment, the contaminant containing the contaminant is used as the contaminated soil 3, but instead of the contaminant, industrial waste such as slag, incinerated ash, sludge, concrete waste, plastic waste, and waste wood is used. The present invention may be applied.

In this embodiment, a pair of work surfaces 4,
4, the water collecting groove 22 is arranged, but the configuration of the working surface and the water collecting groove is not limited to this. For example, a naturally existing sloping land is coated with a water-impermeable material, and the upper surface is formed. In addition to the work surface, the slope of the slope may be used as it is as a water collecting gradient, and a water collecting groove may be provided along an end of the work surface on the downstream side of the water collecting gradient.

Further, in the present embodiment, the work surfaces 4 and 4 provided with a slope for collecting water by forming a slope on the ground are provided, but instead, the work surfaces 4 and 4 are formed on a flat ground surface. A concrete body provided with a slope may be installed, and its upper surface may be used as a work surface.

In the present embodiment, the monitoring apparatus 7 is provided to perform water quality analysis. However, when it is known that a predetermined effect by bioremediation can be obtained by the initially added amount of nutrients and the like. , The monitoring device 7 may be omitted.

In the present embodiment, the water spraying device 8 is provided to reuse the stored water as water for watering. However, there is no need for watering, for example, it is possible to sufficiently expect hydration by rainfall. In this case, the sprinkling device 8 may not be provided. In such a case, a predetermined treatment device may be connected to the water storage tank 25, and the water stored in the treatment device may be appropriately treated and then discharged to a river or the like.

Further, in the present embodiment, the sprinkling pump 12 is provided in the sprinkling device 8 to sprinkle water. However, when the water storage tank is an elevated tank, the sprinkling pump 12 may be omitted.

[0096]

As described above, according to the pollutant decomposition system according to the present invention, the water oozing out of the contaminants is collected in the water collecting ditch and stored in the water storage means. Even if the contaminants or intermediate products by decomposing bacteria or nutrients for enhancing the decomposition activity are leached from the contaminants due to rainfall or rainfall, there is a risk that such leached components will penetrate into the ground and diffuse into the groundwater system. Absent. Therefore,
Bioremediation can be performed without causing water pollution.

[0097]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a pollutant decomposition system according to a first embodiment, and FIG. 1 (b) is a cross-sectional view taken along line AA of FIG. 1 (a).

FIG. 2 is a cross-sectional view illustrating a pollutant decomposition system according to a second embodiment, in which (b) is a cross-sectional view along the line BB of (a).

FIG. 3 is a detailed sectional view showing a pollutant decomposition system according to a second embodiment.

[Explanation of symbols]

1, 21 Pollutant decomposition system 2 Concrete (impermeable material) 3 Contaminated soil (contaminant) 4 Work surface 5, 22 Water collecting groove 6 Water storage pit (water storage means) 7 Monitoring device 8 Watering device 23 Drain pipe 24 Drainage Pump 25 water storage tank (water storage means)

Continued on the front page F term (reference) 2E191 BA11 BA12 BB01 BD20 4D004 AA02 AA12 AA32 AA33 AA36 AA41 AA43 AB02 AB05 AB06 AC07 CA18 CA50 CB03 CB43 CB44 CB50 CC03 CC07 DA01 DA10 DA20

Claims (5)

[Claims] 1. A contaminant decomposition system for decomposing and removing contaminants containing oil, organochlorine compounds and the like by performing bioremediation on the contaminants. And the upper surface thereof is used as a work surface on which the contaminants are spread, and the work surface is provided with a water collecting gradient, and a water collecting groove is provided downstream of the water collecting gradient. A decomposing system for pollutants, comprising a water storage means for storing water collected in the water. 2. The pollutant decomposition system according to claim 1, wherein a drainage gradient is provided along the longitudinal direction of the water collecting groove, and the water storage means is constituted by a water storage pit provided downstream of the drainage gradient. . 3. The method according to claim 1, wherein the water storage means is constituted by a water tank provided on the ground, and a drain pipe is laid in the water collecting groove, and the drain pipe is connected to the water tank via a predetermined drain pump. Item 6. A pollutant decomposition system according to Item 1. 4. The pollutant decomposition system according to claim 1, further comprising a monitoring device for monitoring the quality of the water stored in the water storage means. 5. The contaminant decomposition system according to claim 1, wherein a predetermined sprinkler is connected to the water storage means so that the contaminant can be sprinkled from the sprinkler. .