JP3373788B2 - Contaminated groundwater purification equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for purifying groundwater contaminated with organic chlorine compounds.

[0002]

2. Description of the Related Art Conventional methods for purifying groundwater contaminated with organochlorine compounds include a method of pumping groundwater by installing a submersible motor pump in a well pipe or a pipe for sending air to the groundwater. The air sparging method was also used, but in the pumping method using a submersible motor pump, the first is the method of pumping contaminated groundwater to the ground and performing aeration treatment on the ground. In the case of contaminated groundwater with a concentration, economic efficiency became a problem, and secondly, because the motor pump part was inside the well pipe, its maintenance took time and cost.

[0003]

SUMMARY OF THE INVENTION The present invention eliminates the drawbacks of pumping water by the conventional method and simplifies the apparatus by pumping the contaminated groundwater by an air lift, and facilitates maintenance. The purpose is to reduce costs and increase the efficiency of underground pollutant treatment.

[0004]

According to the present invention, an air supply pipe communicating with a compressor installed on the ground is inserted to extend to the lower side of a pumping pipe in a well pipe and another air supply pipe communicates with this compressor. Inserted into the well pipe in place, communicate the pumping pipe to the gas-liquid separation tank installed on the ground,
In order to carry out the method for purifying contaminated groundwater by sending the pollutants separated in the gas-liquid separation tank to the adsorption treatment device and returning the separated groundwater to the wells, the following device can be considered.

[0005] First, a packer is installed at the water table position of the well pipe having screens at positions facing the saturated zone and the unsaturated zone, respectively, and one air pipe connected to a compressor installed on the ground is provided in the well pipe. Of the pumping pipe, and the other air pipe is inserted near the upper screen of the well pipe, and the pumping pipe is connected to the gas-liquid separation tank installed on the ground. This is a purification device in which an exhaust pipe from a liquid separation tank is connected to a contaminant adsorber and a return water pipe from a gas-liquid separation tank is connected to the well pipe.

Secondly, one air pipe connected to a compressor installed on the ground is inserted to reach the lower side of the pump pipe in the well pipe, and the other air pipe is extended near the screen of the well pipe. Insert the pumping pipe to the gas-liquid separation tank installed on the ground, connect the exhaust pipe from the gas-liquid separation tank to the contaminant adsorber and the return pipe from the gas-liquid separation tank to the well. It is a purification device that communicates with a pipe.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the apparatus example shown in FIG. 1, contaminated groundwater flowing in from a lower screen in a saturated zone (aquifer) of a well pipe is sent from a compressor on the ground at a lower side of a pumping pipe. It is pushed up by the air lift effect of compressed air and introduced into the gas-liquid separation tank on the ground. At this time, the contaminated groundwater is promoted in gas-liquid separation due to the aeration effect of the compressed air sent in.

Since the pollutants in the contaminated groundwater are volatile substances, the separation is promoted by the aeration effect of the compressed air and is easily separated in the gas-liquid separation tank. The polluted gas is sent from the exhaust pipe to the activated carbon adsorber, where it is adsorbed and then released to the outside, and the separated groundwater is returned from the return pipe to the well pipe and stays at the upper part of the packer, then the upper screen. Will start reducing injection into the unsaturated zone (non-aquifer) above the water table.

The groundwater returned to the well pipe encounters the compressed air sent from the compressor. Therefore, if residual pollutants are contained in the returned groundwater by the aeration by this, further re-vaporization separation is performed. Promoted,
Groundwater from which pollutants have been removed will be injected into the unsaturated zone (non-aquifer) from the upper screen. The re-vaporized and separated pollutant gas is discharged from the exhaust pipe in the upper part of the well pipe and discharged to the outside via the pollutant adsorber.

In the device example shown in FIG. 2, the contaminated groundwater flowing in from the screen in the saturation zone of the well pipe is pushed up by the air lift effect by the compressed air sent from the compressor on the ground at the lower side of the pump pipe. , Is introduced into the gas-liquid separation tank on the ground. At this time, the contaminated groundwater is promoted in gas-liquid separation due to the aeration effect of the compressed air sent in.

The volatile pollutant gas separated in this gas-liquid separation tank is sent from an exhaust pipe to a pollutant adsorber, where it is adsorbed and released into the atmospheric layer, and ground water after separation is Since it is returned from the injection pipe to the well and stays there, this groundwater will be circulated along with the newly collected contaminated groundwater.

Since a separate air pipe from the compressor is provided near the screen of the well pipe, aeration is caused to the contaminated groundwater collected from the saturated zone to promote the vaporization of volatile substances. .

As described above, in this example of the apparatus, the contaminated groundwater is aerated at two points in the well pipe and the pumping pipe to pump the water.

[0014]

EXAMPLES In the present invention, two devices are conceivable as examples.

First, the first embodiment shown in FIG. 1 will be described.

Reference numeral 1 denotes a well pipe in which one air feed pipe 3 inserted into the pumping pipe 2 and the other air feed pipe 4 inserted independently.
The lower end of one of the air supply pipes 3 reaches near the lower side of the pumping pipe 2, and the lower end of the other air supply pipe 4 reaches near the unsaturated zone above the packer 5 described later.

Reference numeral 5 is a packer mounted in the well 1 at the position of the water table, which is used to create a saturated zone (aquifer) a below the water table and an unsaturated zone (non-aquifer) b above the water table. Partition.

Depending on the position of the packer 5, the well pipe 1 is provided with an upper screen 6 for reducing and injecting groundwater and a lower screen 7 for collecting groundwater.

Reference numeral 8 is a compressor installed on the ground, and the two air supply pipes 3 and 4 are connected to the compressor in series.

The compressed air that has entered the air supply pipe 3 from the compressor 8 is supplied to the contaminated groundwater that has entered the pumping pipe 2 after passing through the screen 7 of the well pipe 1 at the lower side of the pumping pipe 2. Contaminated groundwater will be pushed up by the airlift effect.

The compressed air that has entered the air supply pipe 4 from the compressor 8 is diffused near the upper screen 6 on the upper side of the well pipe 1 to aerate the separated contaminated groundwater on the ground, which will be described later, and re-evaporate the pollutants. Then, it is reduced and injected into the upper screen 6 of the well 1 as purified groundwater.

Reference numeral 9 is a gas-liquid separation tank installed on the ground, and an upper part 2'of the pumping pipe 2 is continuously provided on the upper part of the gas-liquid separation tank,
In the lower part of the gas-liquid separation tank 9, the return pipe 1 for separated groundwater
0 is connected continuously with the upper part of the well tube 1.

In the gas-liquid separation tank 9, the pollutants separated from the groundwater are sent together with the air through the exhaust pipe 11 to the pollutant adsorber 12 using activated carbon, where the pollutants are completely adsorbed and separated, and then the air is removed. Discharge to the outside.

An exhaust pipe 13 for internal air, which communicates with the upper portion of the well pipe 1, is connected to the pollutant adsorber 12.

Reference numeral 14 is a return pipe for returning the water, which is about to be stored in the bottom portion of the pollutant adsorber 12, to the gas-liquid separation tank 9 again, and a drain pipe 15 communicating with the outside from the gas-liquid separation tank 9 is provided.

Next, the second embodiment shown in FIG. 2 will be described.

Reference numeral 21 denotes a well pipe, and this well pipe is provided with an air supply pipe 23 reaching the lower side of the pumping pipe 22 and independently an air supply pipe 24 reaching the vicinity of the inlet of the pumping pipe 22.

Reference numeral 25 is a screen provided under the well pipe 21 from which ground water is collected.

Reference numeral 26 is a compressor installed on the ground, to which the two air supply pipes 23 and 24 are connected.

The compressed air that has entered the air supply pipe 23 from the compressor 26 is supplied to the contaminated groundwater that has entered the pumping pipe 22 after passing through the screen 25 of the well pipe 21 at the lower side of the pumping pipe 22. The contaminated groundwater will be pushed up by the airlift effect.

The compressed air that has entered the air supply pipe 24 from the compressor 26 diffuses to the lower part of the well pipe 21 near the lower part of the pumping pipe 22, and enters the well pipe 1 from the screen 25 of the well pipe 21. It is supplied to contaminated groundwater, and gas-liquid separation is promoted by the aeration effect.

27 is a gas-liquid separation tank installed on the ground. The upper part 22 'of the pumping pipe 22 is connected to the upper part of the gas-liquid separation tank, and the separated groundwater is provided under the gas-liquid separation tank 27. The return water pipe 28 is connected to the upper part of the well pipe 1.

In the gas-liquid separation tank 27, the pollutants separated from the groundwater are sent together with the air through the exhaust pipe 29 to the pollutant adsorber 30 using activated carbon, where the pollutants are completely adsorbed and separated, and then the air is exposed to the outside. To discharge.

The pollutant adsorber 30 is provided with an exhaust pipe 31 for the air inside the well pipe, which communicates with the upper portion of the well pipe 1.

Reference numeral 32 is a return pipe for returning the water, which is about to be stored in the bottom of the pollutant adsorber 30, to the gas-liquid separation tank 27, and a drain pipe 33 communicating from the gas-liquid separation tank 27 to the outside.
To provide.

[0036]

According to the present invention, since the air lift system is adopted for pumping groundwater containing volatile pollutants, pollutants are aerated by compressed air in the first stage of pumping polluted groundwater. The vaporization and separation of the water will be promoted, and efficient groundwater purification treatment can be realized.

The groundwater from which the pollutants have been separated and purified is returned to the well pipe and reaches the saturation zone again, whereby the polluted groundwater can be collected in a diluted state and a cycle for purification of the polluted groundwater is formed. Therefore, highly efficient purification processing can be performed.

Further, since the various devices are located on the ground, the structure inside the well is simplified, the maintenance thereof is facilitated, and it is possible to provide a highly economical device at low cost.

[Brief description of drawings]

FIG. 1 is an example of an apparatus for carrying out the present invention.

FIG. 2 is another example of a device for implementing the present invention.

[Explanation of symbols]

1,21 well tube 2,22 Pumping pipe 3,23 Air pipe 4,24 air pipe 5 packers 6 screens 7 screen 8,26 compressor 9,27 gas-liquid separation tank 10,28 Return pipe 11,29 exhaust pipe 12,30 Pollutant adsorber 14,32 Return pipe 25 screen

Claims (2)

(57) [Claims] 1. A well pipe having screens respectively disposed near the saturated zone and the unsaturated zone, and one air pipe extending to the lower side of the pumping pipe inserted into the well pipe.
The other air pipe that extends to the vicinity of the screen located in the unsaturated zone near the screen and these two air pipes are connected to a compressor installed on the ground, and a packer is installed at the water table of the well pipe. Then, the pumping pipe is connected to a gas-liquid separation tank installed on the ground, the exhaust pipe is connected to the pollutant adsorber from the gas-liquid separation tank, and the return pipe is connected to the well pipe from the gas-liquid separation tank. A contaminated groundwater purification device that is connected. 2. A well pipe having a screen disposed near the saturation zone, one air pipe extending to the lower side inside the pumping pipe inserted into the well pipe, and a portion of the well pipe near the screen. The other air pipe extending up to and to the two air pipes are connected to a compressor installed on the ground, and the pumping pipe is connected to a gas-liquid separation tank installed on the ground. A contaminated groundwater purification device in which an exhaust pipe is connected to a pollutant adsorber, and a return water pipe is connected from the gas-liquid separation tank to the well pipe.