JP2002011454A - Soil cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the constitution of a soil cleaning device for cleaning soil contaminated by chemical materials, etc., simpler and smaller in size, to make its maintenance simpler and to make the installation and degree of freedom in movement greater and more cost effective in independent operation by the self-supply of electric power. SOLUTION: An adsorption vessel 1 is connected by inflow piping 5 to a well for sucking soil gas through a high-pressure blower 3a for suction and a gas-liquid separation vessel 4 at an intake port 2 disposed in its lower part and is communicated with exhaust piping 7 on a downstream side from an air exit 6 at the apex. A cartridge heater 11 is inserted in the vessel to the downward space of an active carbon layer 10 to lower the humidity of the soil gas, by which the temperature of the soil gas is adjusted to a prescribed temperature at which the active carbon is liable to be adsorbed. The constitution provided with an active carbon vessel 15 for separated water in communication with the lower side from the bottom of the gas-liquid separation vessel 4 is built into a stand 20, by which the device is downsized. A driving power source for driving the high-pressure blower 3a is provided with a solar battery 21, a wind power generator 22 and a fuel battery 36 so that the self-supply of the electric power by the utilization of natural and chemical energy is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil purification apparatus for purifying soil contaminated by chemical substances or the like.

[0002]

2. Description of the Related Art Conventionally, as this kind of soil purification apparatus, there is one disclosed in Japanese Patent Application Laid-Open No. 11-114546.
That is, in a soil purification device that includes a well, a gas-liquid separation tower, an activated carbon tower, and a vacuum pump, and purifies soil gas sucked from the well through the gas-liquid separation tower and the activated carbon tower in order, the well and the gas-liquid separation are performed. A gas suction pipe connecting the tower is provided with a suction gas shut-off valve, while an air suction pipe for sucking air is connected to the bottom of the gas-liquid separation tower. When the amount of water stored in the gas-liquid separation tower increases during the soil purification operation, the vacuum pump is stopped, the suction gas shut-off valve is closed, and the aeration shut-off valve is opened. By re-operating, the aeration operation to aerate the stored water to make it clean water is possible.

[0003]

In such a conventional soil purification apparatus, the pollution status of the treatment site is often wide and deep, and the equipment becomes large and the equipment cost and operation cost increase accordingly. Pollution is noticeable everywhere,
There is a problem that the installation area, the installation place is moved and the cost is difficult in the current situation where it is necessary to respond as needed, the efficiency of removing pollutants is good, and the installation, movement and maintenance operation are simple, and various costs are low. Things are required.

In places where soil purification is required,
In general, there are places similar to vacant lots and vacant lots removed from factories, and abandoned factories that have been shut down. Basically, self-supply of electric power and unmanned operation for 24 hours are required.

The present invention solves such a conventional problem, and improves the removal efficiency with a simple configuration mainly for removing volatile organic compounds, and is a small-sized soil purification system that is easy to install, move and maintain. It is intended to provide a device.

It is another object of the present invention to provide a soil purification apparatus which can further save energy by using natural energy and a fuel cell together and can operate independently in a remote place by self-supply of electric power.

[0007]

In order to achieve the above object, the soil purification apparatus of the present invention has a blower for sucking soil gas, a gas-liquid separation tank for the sucked soil gas, and a contaminant in the soil gas. An activated carbon adsorption tank for adsorption is provided, and a heating unit is provided upstream of the activated carbon adsorption tank.

According to the present invention, there is provided a soil purification apparatus which is small in size, can adjust the temperature and humidity of soil gas, can be easily installed and moved, and has a high efficiency of removing pollutants.

In addition, the gas-liquid separation tank is provided with an activated carbon tank for separation water, and contaminants dissolved in the liquid can be safely discharged by adsorption and removal in the apparatus.

Another means is that the blower, the gas-liquid separation tank and the activated carbon adsorption tank communicate with each other via a flexible tube made of a transparent material.

According to the present invention, there is provided a soil purification apparatus which can easily perform maintenance and maintenance such as cleaning of a gas-liquid separation tank and exchange of activated carbon in an activated carbon adsorption tank.

Another means is that a solar cell and a wind power generator using natural energy are used as a power source of a blower for passing soil gas, and the solar cell and the wind power generator are generated via a charge / discharge controller. Storage battery for storing the electric power generated.

According to the present invention, there is provided a soil purification apparatus capable of reducing the load on a commercial power source by combining a power source with a solar cell of natural energy and a wind power generator.

Another means is an electrolysis apparatus for electrolyzing water into oxygen and hydrogen using electric power generated by a solar cell as a natural energy source and a wind power generation apparatus; It is provided with a fuel cell that generates electrical energy by reacting oxygen.

According to the present invention, a power supply can be stabilized by supplementing fluctuations in power generation due to weather conditions with a fuel cell, and a soil purification apparatus capable of independent operation by self-supply of power can be obtained.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a blower for sucking soil gas, a gas-liquid separation tank for sucking soil gas, and an activated carbon adsorption tank for adsorbing pollutants in soil gas. Is provided with a heating unit such as a cartridge heater on the upstream side of the unit.By using a blower to suck the soil gas, it is compact, low noise and easy to maintain, and the heating unit reduces the humidity of the relatively low temperature and high humidity soil gas. The temperature can be adjusted so that the activated carbon is easily adsorbed.

Further, the gas-liquid separation tank is provided with an activated carbon tank for separated water, and the contaminants in the separated water can be made harmless by adsorbing them with activated carbon for liquid filtration.

Further, the blower, the gas-liquid separation tank and the activated carbon adsorption tank communicate with each other via a flexible tube made of a transparent material, so that the presence or absence of moisture in the soil gas can be monitored. Necessary parts are removed by exchanging activated carbon, etc., so that there is a large margin at the time of installation and maintenance and maintenance can be simplified.

According to the present invention, a wind power generator is provided in addition to a solar cell, and a storage battery is provided for storing power other than the required amount of the generated power. At the same time, the supply can be stabilized by accumulating surplus power.

In addition, a control circuit using a commercial power supply is provided when the power generated by the solar cell and the wind power generator decreases due to weather conditions, and where the commercial power is available, the supply of the power is protected.

Further, the commercial power supply is provided with a control circuit for preferentially using late-night power, so that the power supply can be stably protected at low cost.

Further, the blower is driven by a DC motor having high efficiency and low electric power, and is suitable for continuous use for 24 hours and can perform energy-saving operation.

Also, a fuel cell that generates electric energy by reacting generated hydrogen with oxygen in the air by an electrolyzer that electrolyzes water into oxygen and hydrogen using electric power generated by a solar cell and a wind power generator. To protect the power supply stabilization where commercial power is not available.

Further, an oxygen storage device and a hydrogen storage device for storing oxygen and hydrogen generated by the electrolyzer are provided, respectively, to prevent the fuel cell from being stopped due to a shortage of main fuel.

Further, when the power generated by the solar cell and the wind power generator decreases due to weather conditions, a control circuit is provided which uses the midnight power of the commercial power supply for the electrolysis of water. The load can be leveled.

In addition, a control circuit for using the hydrogen in the hydrogen storage for the fuel cell in an emergency is provided to prevent the fuel cell from stopping due to running out of main fuel.

Further, the apparatus is provided with an apparatus for automatically detecting the concentration of contaminants in soil gas obtained by absorbing and filtering the contaminants, and an automatic stop device when the detected concentration is equal to or higher than a specified value, so that self-monitoring of the apparatus can be performed. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0029]

(Embodiment 1) As shown in FIGS. 1, 2 and 3, a cylindrical can-shaped adsorption tank 1 is provided with a high-pressure blower 3 for suction and an air supply port 2 provided at the lower part of its outer periphery. It is connected to an air collecting pipe (not shown) inserted into a well for sucking soil gas through a liquid separation tank 4 by an inflow pipe 5, and communicates from an exhaust port 6 at the top to an exhaust pipe 7 on the downstream side. The adsorption tank 1 uses a JIS open ordinary drum can as a tank body, and the top canopy 8 is detachable by a bolt-type band stopper. A filter medium receiving plate 9 which is a SUS punched metal sheet on which a SUS net is spread is provided at a predetermined distance from the bottom surface in the tank, and an activated carbon layer 10 filled with activated carbon is provided above.
A cartridge heater 11 is inserted from the lower part of the outer periphery of the tank body into the space below the filter medium receiving plate 9 so as to face the air supply port 2.

A drain port 1a is provided in the lower space. An upstream side of the air supply port 2 communicates with an outlet of the high-pressure blower 3 by an air supply pipe 12, and a suction port of the high-pressure blower 3 communicates with the gas-liquid separation tank 4 through an air supply valve 14 through an air supply pipe 13. Activated carbon tank for separated water 1 communicating downward from the bottom of gas-liquid separation tank 4
5 is provided.

The air supply pipe 12 and the air supply pipe 13 are made of hard plastic or metal pipe, but are made of soft transparent plastic connection tubes 12a and 13a whose predetermined portions are reinforced with spiral steel wires. From the upstream side, a water level sensor 16, a pressure gauge 17 on the side of the high pressure blower 3 from the connection tube 13 a of the air supply pipe 13, and a connection tube 12 of the air supply pipe 12 from the upstream side in order to manage the operation state of the purification process.
The flow meter 18 is disposed on the high-pressure blower 3 side from a. The control panel 19 controls the stop and start of the high-pressure blower 3 based on a signal from the water level sensor 16. All of these components are incorporated in an L-shaped steel base 20 welded to a rectangular frame.

In the above configuration, the high-pressure blower 3 is operated to feed the contaminated soil gas from the well for sucking the soil gas into the inflow pipe 5.
The water contained in the gas is introduced into the gas-liquid separation tank 4 to separate the water contained therein, and only the gas is sent from the air supply pipe 12 through the high-pressure blower 3 to the adsorption tank 1 from the air supply port 2 by the air supply pipe 13. In the adsorption tank 1, the humidity of the relatively low-temperature and high-humidity soil gas is reduced by the cartridge heater 11 to a predetermined temperature at which the activated carbon is easily adsorbed, and passes through the activated carbon layer 10 to adsorb and remove volatile organic compounds in the soil gas. Then, it is released from the exhaust pipe 7 into the outside air. The water separated in the first stage accumulates at the bottom of the gas-liquid separation tank 4, and when the amount of water exceeds a predetermined value, the water level sensor 16 sends a signal, and the control panel 1 receives the signal.
9 stops the high pressure blower 3.

Then, the stored water is dropped into the activated carbon tank 15 for separated water, and harmless water adsorbing contaminants dissolved in the water is released. When the water level of the stored water drops, the high-pressure blower 3 is activated by a signal from the water level sensor 16.

When the groundwater level rises due to rainfall and a large amount of water is sucked together with the soil gas, the separated water rapidly increases and the high-pressure blower 3 is stopped by the water level sensor 16 as described above. In addition to the above treatment, the drain is drained from the drain port 1a of the adsorption tank 1, and the outside air introduction valve 1
By opening 4 and operating the high-pressure blower 3, the high-pressure blower 3 itself and the activated carbon layer 10 are dried. The incorporation of moisture into the gas can also be detected by observing the connection tubes 12a and 13a made of transparent plastic. When the activated carbon layer 10 is determined to be saturated by the exhaust gas inspection, the canopy 8 is activated.
Remove and replace with new activated carbon.

In the case where the contamination status extends to a deep layer, it can be dealt with simply by replacing the high pressure blower with a vacuum pump.

As described above, the adsorption tank, the blower, and the gas-liquid separation tank using the drums of the market standard are connected by simple piping.
By providing a built-in power supply control panel in a frame of about 6 square meters, it can be easily moved by a small truck as needed to purify groundwater. In addition, since a general market product is used for the adsorption tank, the blower, and the gas-liquid separation tank, the cost can be reduced because the mold and the process are omitted.

(Embodiment 2) FIG. 4 shows a high-pressure blower 3a which drives a high-pressure blower 3 for passing a soil gas by a DC motor, and uses this power source as a soil purification using power generation by natural energy and chemical energy. Device. That is, a solar cell 21 and a wind power generator 22 of natural energy are provided, and the generated power is stored in a storage battery 24 stored as DC power via a charge / discharge controller 23.
And the power converter 25. At this time, a rectifier is used because the wind power generator is usually an alternating current. The chemical energy fuel cell 26 is connected to the power converter 25 as DC power. Further, a commercial power supply 27 is connected to the power converter 25. As for the fuel of the phosphoric acid type fuel cell 26, water collected at the bottom of the gas-liquid separation tank 4 is dropped into the activated carbon tank 15 for separated water, and a pollutant dissolved in water is adsorbed and made harmless. The water supply pipe 29 is branched by the
The water taken at 0 is electrolyzed into hydrogen and oxygen in an electrolyzer 31 and sent to a hydrogen storage 32 and an oxygen storage 33, respectively. When the water in the gas-liquid separation tank 4 is insufficient, the switching valve 28 is switched to use water from outside. The hydrogen storage 32 is in direct communication with the fuel cell 26. The oxygen storage 33 communicates with the fuel cell 26 via the switching valve 34. An air compressor 35 is connected to the switching valve 34 by an air pipe 36.

As shown in FIG. 5, the control unit 37 controls the available energy status detecting means 3 by the control arithmetic unit 38.
9 is compared by the comparing means 40, and is selected and driven by the used energy determining / driving means 41. In addition, the pollutant concentration automatic detector 42 is connected to the exhaust pipe 7.
The automatic stop valve 43 is provided, and when the detected concentration of the contaminant is equal to or higher than the specified value by the control panel 19, the gas suction is stopped.

In the above-described configuration, the DC power of the solar cell 21, the wind power generator 22, and the fuel cell 26 and the AC power of the commercial power supply 27 are integrated in the power converter 25, and the high-pressure blower 3a, the electrolytic device 31, and the liquid feed pump are integrated. DC power is supplied to 30 and AC power is converted and supplied to the air compressor 35 as necessary. By combining the DC power of the wind power generator 22 and the DC power of the solar cell 21 generated when the wind is present regardless of day and night, the power by natural energy increases,
This is to improve the energy saving of the commercial power supply 27. The water electrolyzed by the electrolyzer 31 is generated at a ratio of hydrogen 2 to oxygen 1. Therefore, the oxygen consumed in the fuel cell 26 uses oxygen in the air normally supplied by the air compressor 35 in case of emergency. The selection by the use energy determining / driving means 41 gives priority to natural energy, and the fuel cell 26 and the commercial power supply 27 are used supplementarily. In addition, electrolysis device 3
1 controls the use of inexpensive midnight power with a low usage fee for the commercial power supply 27, thereby reducing the economic burden on the commercial power supply 27 and leveling the burden on each power supply. The high-pressure blower 3a of this embodiment can perform energy-saving operation suitable for continuous use for 24 hours by using a DC motor for driving.

[0040]

As is apparent from the above embodiments, according to the present invention, by providing a heating section in an activated carbon adsorption tank for adsorbing pollutants in soil gas, the water content of the treated gas can be reduced and adsorbed. It is possible to provide a soil purification apparatus that has an effect of increasing the temperature easily and improving the adsorption efficiency of pollutants.

Further, by providing the activated carbon tank for separated water, it is possible to provide a soil purification apparatus which is capable of harmlessly treating the separated water on site, and is capable of independently treating it anywhere.

In addition, by communicating the main structure with a flexible tube made of a transparent material, gas can be monitored during processing, and there is a large allowance at the time of mounting, so that mounting and dismounting of each part is easy and maintenance is possible. It is possible to provide a soil purification device having an effect that maintenance can be easily performed.

In addition, the use of natural energy power by solar cells and wind power generators, and the use of fuel cell power by chemical energy that does not require a large-scale place and equipment,
Soil that is capable of independent operation by self-supply of electric power even in places where commercial power is not drawn in, has a large degree of freedom in installation operation, saves energy of commercial power, and can prevent the global environment and promote purification. A purification device can be provided.

Further, there is provided a soil purification apparatus which can supply fuel from the hydrogen storage device and the oxygen storage device even in an emergency such as a power outage of a commercial power supply, and can maintain the power supply by continuing to drive the fuel cell. it can.

[Brief description of the drawings]

FIG. 1 is a layout diagram of a main part showing a soil purification apparatus according to an embodiment of the present invention.

FIG. 2 is a fragmentary side view showing the same soil purification apparatus.

FIG. 3 is a plan view showing the soil purification device.

FIG. 4 is a configuration diagram of power supply using natural and chemical energy.

FIG. 5 is an explanatory diagram of the control arithmetic unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adsorption tank 2 Air supply port 3 and 3a High-pressure blower 4 Gas-liquid separation tank 5 Inflow pipe 6 Exhaust port 7 Exhaust pipe 8 Canopy 9 Filter medium receiving plate 10 Activated carbon layer 11 Cartridge heater 12, 13 Air supply pipe 12a, 13a Connection tube 14 Outside air Introduction valve 15 Activated carbon tank for separated water 16 Water level sensor 17 Pressure gauge 18 Flowmeter 19 Control panel 21 Solar cell 22 Wind power generator 23 Charge / discharge controller 24 Storage battery 25 Power converter 26 Fuel cell 27 Commercial power supply 28, 34 Switching valve 29 Water pipe 30 Liquid feed pump 31 Electrolyzer 32 Hydrogen storage device 33 Oxygen storage device 35 Air compressor 36 Air piping 37 Control device 38 Control operation device 39 Energy status detection means 40 Comparison means 41 Utilization energy determination / drive means 42 Pollutant concentration automatic Detector 43 Automatic stop valve

Claims (12)

[Claims] 1. A blower for sucking soil gas from a well, a gas-liquid separation tank for sucking the soil gas, and an activated carbon adsorption tank for adsorbing pollutants in the soil gas, wherein an upstream side of the activated carbon adsorption tank is provided. Soil purification device equipped with a heating unit. 2. The soil purification apparatus according to claim 1, wherein the gas-liquid separation tank is provided with an activated carbon tank for separated water. 3. The soil purification apparatus according to claim 1, wherein the blower, the gas-liquid separation tank, and the activated carbon adsorption tank communicate with each other via a flexible tube made of a transparent material. 4. A solar cell and a wind power generator using natural energy as a power source of a blower for sucking soil gas, and electric power generated by the solar cell and the wind power generator via a charge / discharge controller is stored. The soil purification apparatus according to claim 1, further comprising a storage battery that operates. 5. The soil purification apparatus according to claim 1, further comprising a control circuit that uses a commercial power supply when the power generated by the solar cell and the wind power generator decreases due to weather conditions. 6. The soil purification apparatus according to claim 5, wherein the commercial power supply is provided with a control circuit that preferentially uses midnight power. 7. The soil purification apparatus according to claim 1, wherein the blower is driven by a DC motor. 8. An electrolyzer for electrolyzing water into oxygen and hydrogen using electric power generated by a solar cell and a wind power generator as a natural energy source, and reacting the hydrogen generated by the electrolyzer with oxygen in the air. The soil purification device according to claim 1, further comprising a fuel cell that generates electric energy. 9. The soil purification apparatus according to claim 8, further comprising an oxygen storage and a hydrogen storage for respectively storing oxygen and hydrogen generated by the electrolysis apparatus. 10. A control circuit is provided which uses midnight power of a commercial power supply for electrolysis of water when power generated by a solar cell and a wind power generator decreases due to weather conditions.
The soil purification device according to any one of the preceding claims. 11. The soil purification apparatus according to claim 8, further comprising a control circuit for using hydrogen in the hydrogen storage for the fuel cell in an emergency. 12. The soil purification apparatus according to claim 1, further comprising an automatic detection device for detecting the concentration of the contaminant of the soil gas obtained by adsorbing and filtering the contaminant, and an automatic stop device when the detected concentration is equal to or higher than a specified value.