JP2000117238A - Purifying equipment for soil contaminant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the purifying equipment for a soil contaminant by which the soil gas and groundwater sucked out of the soil contaminated with volatile org. compds. and contg. the org. compds. are easily and efficiently decontaminated, and the soil is decontaminated in a short period of time. SOLUTION: An aeration tank 2 is provided between a well 1 and a suction pump 3 to store the groundwater sucked out of the soil contaminated with volatile org. compds. and contg. the org. compds. A soil gas sucked from the soil and contg. the org. compds. is introduced along with the groundwater from a nozzle 21 furnished at the bottom of the tank 2, hence the groundwater stored in the tank 2 and the newly sucked groundwater are aerated by the sucked soil gas and purified, and the soil gas sucked from the soil is separated from the groundwater in the tank 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for purifying soil contaminants, and more particularly, to a method for removing soil gas containing volatile organic compounds and suctioning groundwater from the soil contaminated with the volatile organic compounds. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil contaminant purification equipment capable of purifying and easily purifying volatile organic compounds contained in soil gas and groundwater.

[0002]

2. Description of the Related Art In recent years, volatile organic compounds such as trichloroethylene and tetrachloroethane, which have been used as cleaning agents in factories, etc., leak due to structural defects in treatment systems, accidents, etc., and penetrate into soil. Cases of polluting surrounding soil and groundwater have been published in various places.

In such a case, the soil contaminated with the volatile organic compound is purified by sucking the soil gas and the groundwater containing the volatile organic compound from the soil, and the soil gas and the groundwater contained in the sucked soil gas and the groundwater. Purification processing of volatile organic compounds is performed.

[0004] By the way, for example, a facility as shown in FIG. 2 has been conventionally used as a facility for purifying soil pollutants for purifying soil contaminated by the volatile organic compound.

[0005] This equipment for purifying soil contaminants excavates a well 1 in soil contaminated with volatile organic compounds, and removes soil gas containing volatile organic compounds from soil contaminated with volatile organic compounds. The soil is purified by sucking the groundwater by the suction pump 3. The soil gas containing the volatile organic compound and the groundwater sucked by the suction pump 3 are separated from the groundwater by a gas-liquid separation tank provided with a water level sensor 22. After the gas-liquid separation in 2A, the water and the gas are separately processed in two lines of processing equipment of the gas processing system.

In the water treatment system, the water level of the groundwater in the gas-liquid separation tank 2A is detected by the water level sensor 22, and when the water level becomes full, the suction pump 3 is stopped and the gas treatment system valve f Is closed, the air inflow valve a and the drainage valve b of the gas-liquid separation tank 2A are opened, and the groundwater in the gas-liquid separation tank 2A is introduced into the aeration tank 2B. b is closed. Next, while operating the suction pump 3, the air introduction valve d and the gas discharge valve g of the aeration tank 2B are opened, air is introduced from the bottom of the aeration tank 2B, and the volatile organic compounds stored in the aeration tank 2B. Aerate the groundwater containing the compound. After aeration for a certain period of time, the air introduction valve d is closed, the suction pump 3 is stopped, the air inflow valve c and the drain valve e of the aeration tank are opened, and the treated water purified by aeration is filled with activated carbon. It is passed through the treatment system purification device 4B, reprocessed, and discharged out of the system. afterwards,
The air inflow valve c and the drainage valve e of the aeration tank 2B are closed, the gas treatment system valve f is opened, and the soil gas containing the volatile organic compound and the groundwater are sucked again from the soil by the suction pump 3.

On the other hand, in the gas treatment system, when the suction pump 3 is operating, the soil gas separated in the gas-liquid separation tank 2A through the gas treatment system valve f is supplied to the gas discharge valve g. The gas after aeration of groundwater in the aeration tank 2B through the gas is converted into a gas treatment system purification device 4 filled with activated carbon.
A, reprocessed, and discharged out of the system.

[0008]

By the way, the above-mentioned conventional equipment for purifying soil contaminants is provided with the operation and operation of the suction pump 3.
It is necessary to operate the stop in association with the opening and closing operations of a large number of valves a to g. For this reason, sequencer control is indispensable, and this has been a factor that increases equipment costs. In addition, during the aeration in the water treatment system, soil gas and groundwater containing volatile organic compounds are sucked from the soil, and the gas treatment system cannot be operated. Cannot be performed in parallel,
There is a problem that the treatment efficiency of the soil gas and the groundwater is low, and it takes a long time to purify the soil.

The present invention has been made in view of the above-mentioned problems of the conventional soil contaminant purification treatment equipment, and has been developed to easily remove a soil gas and groundwater containing a volatile organic compound sucked from soil contaminated with the volatile organic compound. It is an object of the present invention to provide a soil contaminant purification treatment facility that can perform purification treatment efficiently and efficiently and can complete soil purification in a short period of time.

[0010]

In order to achieve the above object, a soil contaminant purification system of the present invention stores groundwater containing volatile organic compounds sucked from soil contaminated with volatile organic compounds. By introducing a soil gas containing a volatile organic compound sucked from the soil together with the groundwater from the bottom of the aeration tank so that the groundwater stored in the aeration tank and the newly sucked groundwater are removed from the soil. The cleaning process is performed by aeration with the sucked soil gas, and the gas-liquid separation of the ground gas and the soil gas sucked from the soil is performed.

This equipment for purifying soil contaminants is provided by a volatilizer sucked from the soil from the bottom of an aeration tank for storing groundwater containing the volatile organic compound sucked from the soil contaminated with the volatile organic compound. By introducing the soil gas containing the organic compound together with the groundwater, the groundwater stored in the aeration tank and the newly sucked groundwater are aerated by the sucked soil gas to perform the purification treatment and are sucked from the soil. Since the gas-liquid separation of the soil gas and the groundwater is performed, the gas-liquid separation tank is not required, and the control mechanism of the suction pump and the valve is simplified, so that the equipment cost can be reduced. Further, since the soil gas and the groundwater can be treated in parallel while sucking the soil gas and the groundwater containing the volatile organic compound from the soil, the soil gas and the groundwater can be efficiently purified.

[0012] In this case, the gas and the treated water separated from the gas and the liquid may be reprocessed by the purifying device and then discharged.

[0013] Thus, the gas and the treated water separated by gas and liquid can be discharged out of the system in a surely detoxified state.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a soil contaminant purification treatment equipment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a soil contaminant purification treatment system according to the present invention. This soil contaminant purification treatment facility drills a well 1 in soil contaminated with volatile organic compounds, and sucks soil gas and groundwater containing volatile organic compounds from soil contaminated with volatile organic compounds. Soil is purified by suction with a pump 3, and groundwater containing a volatile organic compound sucked from soil contaminated with the volatile organic compound is stored between a well 1 and a suction pump 3. The aeration tank 2 is arranged as described above, and a nozzle 21 provided at the bottom of the aeration tank 2
By introducing the soil gas containing the volatile organic compound sucked from the soil together with the groundwater, the groundwater stored in the aeration tank 2 and the newly sucked groundwater are aerated by the sucked soil gas to perform a purification treatment. At the same time, in the aeration tank 2, gas-liquid separation of soil gas sucked from soil and groundwater is performed.

In this case, a water level gauge 22 is provided in the aeration tank 2 so that the water level of the groundwater stored in the aeration tank 2 can be maintained at an appropriate level. The gas and the groundwater in the aeration tank 2 can be sampled through the valves 22a and 22b provided in the above. In addition, a gas treatment system purification device 4A filled with activated carbon is provided at the upper part of the aeration tank 2, and the gas after reprocessing by the measurement devices 23 such as a pressure gauge and the gas treatment system purification device 4A is provided on the top surface. Is provided, and the exhaust pipe 6 communicating with the suction pump 3 is connected. In addition, a lower portion of the aeration tank 2 is provided with an inlet pipe 7 for introducing soil gas and groundwater sucked from the soil contaminated with the volatile organic compound through the well 1 into the aeration tank 2 and aeration treatment in the aeration tank 2. A drain pipe 8 for discharging the treated water is connected. The introduction pipe 7 for introducing soil gas and groundwater into the aeration tank 2 includes:
A valve 25 is provided, and the valve 25 is operated while the suction pump 3 is operated.
By opening the air, air is introduced from the bottom of the aeration tank 2 so that the groundwater stored in the aeration tank 2 can be additionally aerated.

The treated water that has been aerated in the aeration tank 2 is passed through a drainage pipe 8 provided with a valve 81 to a water treatment system purification device 4B filled with activated carbon. After a total of 5B, it is discharged out of the system.

On the other hand, after the groundwater stored in the aeration tank 2 is aerated, the gas gas-liquid separated soil gas is passed through a gas treatment system purification device 4A filled with activated carbon, and reprocessed. After a total of 5 A, it is discharged out of the system.

As described above, this equipment for purifying soil contaminants comprises an aeration tank for storing groundwater containing volatile organic compounds sucked through the well 1 from soil contaminated with volatile organic compounds. By introducing soil gas containing volatile organic compounds sucked from the soil together with the groundwater from the bottom of the base 2, the groundwater stored in the aeration tank 2 and the newly sucked groundwater are removed from the sucked soil gas (in this case, If necessary, by opening the valve 25, air can be supplementarily introduced from the bottom of the aeration tank 2.)
Since the gas-liquid separation of the ground gas and the soil gas sucked from the soil is performed, the gas-liquid separation tank, which was conventionally required, becomes unnecessary, and the control mechanism of the suction pump 3 and the valve is simplified, and the equipment cost is reduced. Can be reduced. In addition, since the treatment of the soil gas and the groundwater can be performed in parallel while sucking the soil gas and the groundwater containing the volatile organic compound from the soil, the soil gas and the groundwater can be efficiently purified. Becomes
Furthermore, after the gas and liquid separated from the gas and the treated water are reprocessed by the purifiers 4A and 4B filled with activated carbon, respectively,
Since the gas and the treated water are discharged to the outside of the system, the gas and the treated water can be reliably discharged to the outside of the system in a detoxified state.

Further, the total amount of volatile organic compounds purified by the soil pollutant purification equipment is calculated by the capacity of gas and treated water measured by the integrated flow meters 5A and 5B.
It can be calculated by multiplying the concentration of the volatile organic compound contained in the ground gas and the soil gas sucked from the soil.

[0021]

According to the soil contaminant purification equipment of the present invention, the groundwater containing volatile organic compounds sucked from soil contaminated with volatile organic compounds is stored from the bottom of the aeration tank. By introducing the soil gas containing volatile organic compounds sucked from the soil together with the groundwater, the groundwater stored in the aeration tank and the newly sucked groundwater are aerated by the sucked soil gas to perform a purification treatment. At the same time, the gas-liquid separation of soil gas and groundwater sucked from the soil is eliminated, so that a gas-liquid separation tank is not required, and the control mechanism of the suction pump and valve is simplified, reducing equipment costs. Can be. Further, since the treatment of the soil gas and the groundwater can be performed in parallel while sucking the soil gas and the groundwater containing the volatile organic compound from the soil, it is possible to efficiently purify the soil gas and the groundwater, Soil purification can be completed in a short time.

Further, the gas and the treated water separated by gas and liquid are reprocessed by the purifying device and then discharged, so that the gas and treated water separated by gas and liquid can be surely rendered harmless. Can be discharged outside the system.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of a soil contaminant purification treatment facility of the present invention.

FIG. 2 is a schematic diagram showing a conventional soil contaminant purification treatment facility.

[Explanation of symbols]

 Reference Signs List 1 well 2 aeration tank 3 suction pump 4A gas treatment system purifier 4B water treatment system purifier 5A integrating flow meter 5B integrating flow meter 6 exhaust pipe 7 introduction pipe 8 drain pipe

Claims (2)

[Claims] 1. A soil containing a volatile organic compound sucked from the soil from a bottom of an aeration tank adapted to store groundwater containing the volatile organic compound sucked from the soil contaminated by the volatile organic compound. By introducing the gas together with the groundwater, the groundwater stored in the aeration tank and the newly sucked groundwater are aerated by the sucked soil gas to perform a purification treatment, and the soil gas sucked from the soil and the groundwater are removed. A purification facility for soil contaminants, wherein gas-liquid separation is performed. 2. The equipment for purifying soil pollutants according to claim 1, wherein the gas and the treated water separated from gas and liquid are retreated by a purifying device and then discharged.