JP4923266B2 - Contaminated water treatment equipment - Google Patents

Description

The present invention relates to a contaminated water aeration apparatus that performs aeration treatment of contaminated water on the ground in order to desorb the volatile organic compound from contaminated water such as groundwater containing volatile organic compounds harmful to human bodies, and the apparatus. It relates to the contaminated water treatment equipment used.

  The VOC is desorbed and removed from contaminated water such as groundwater containing a volatile organic compound called VOC, and further, the desorbed VOC gas is treated.

  Various methods have been proposed so far for removing VOCs from contaminated water such as groundwater, but as a typical example, the contaminated water is guided to the aeration tank on the ground and aerated in the aeration tank. For example, the VOC dissolved in the contaminated water can be volatilized and desorbed.

  For example, in JP-A-7-308660, contaminated water pumped from an underground well is introduced into the aeration tank from the upper part of the aeration tank, and in a filler such as Raschig ring or terralet packing in the aeration tank. In addition, the contaminated water is aerated by supplying air from the lower part of the aeration tank with a blower, thereby volatilizing the VOC from the contaminated water and taking it out from the upper part of the aeration tank and collecting the purified water in the lower part of the aeration tank. In addition, it is described that the VOC gas taken out from the upper part of the aeration tank is processed in the gas processing unit.

  In JP-A-2003-181448, aeration treatment of contaminated water is performed in the same manner as JP-A-7-308660, except that an aeration tank is used in which an area in which a plurality of ultraviolet lamps are arranged is formed. In addition, it is described that the VOC gas transferred to the gas phase is taken out and processed.

  In addition to the above, as illustrated in FIG. 4, the trays 91 are arranged in a plurality of stages in the vertical direction in the aeration tank 9, contaminated water is supplied from the upper part of the aeration tank, and sequentially dropped and moved to the trays 91 in the plurality of stages. On the other hand, air is supplied from the lower part of the aeration tank by the blower 92 and is vented from the bottom to the upper through holes formed in each tray, thereby aeration of contaminated water and volatilization of VOC and taking out from the upper part of the aeration tank. There is also known a method in which treated water is collected and taken out at the lower part, and the VOC gas taken out from the upper part of the aeration tank is treated in a gas treating part.

JP-A-7-308660 JP 2003-181448 A

  However, with the aeration method described in Japanese Patent Application Laid-Open No. 7-308660 and Japanese Patent Application Laid-Open No. 2003-181448, it is difficult to sufficiently aerate the contaminated water in the entire aerated tank. Aeration efficiency is low for use.

  In order to increase the contact between contaminated water and air, a filler region must be formed in the aeration tank, and a blower for supplying air into the aeration tank is required to have a high output. Therefore, the apparatus configuration is expensive, the power consumption of the large output blower is large, and the running cost is high.

  In this regard, according to the aeration tank 9 shown in FIG. 4, it is considered that the contaminated water can be efficiently aerated. However, even in this case, a plurality of aeration trays 91 are necessary, and the aeration tank 9 is supplied with air. Therefore, the blower 92 is required to have a large output, so that the device configuration is expensive, and the power consumption of the large output blower is large and the running cost is high.

The present invention originally intends to solve the third and fourth problems to be described later, but as a premise thereof, it intends to solve the first and third problems described below.
The first problem is a contaminated water aeration apparatus that aerates contaminated water containing a volatile organic compound and volatilizes and desorbs volatile organic compounds from the contaminated water. An object of the present invention is to provide a contaminated water aeration apparatus that can reliably aerate and volatilize and desorb volatile organic compounds as much as possible and can keep running costs low .

The second problem can solve the first problem, and can be easily transported or installed as a whole, easily in multiple stages according to the degree of contamination of the contaminated water, and It is an object of the present invention to provide a contaminated water aeration apparatus that can be continuously used with a high degree of freedom in each arrangement .

The third problem is that volatile organic compounds containing volatile organic compounds are aerated to volatilize and desorb volatile organic compounds from the contaminated water, and are volatile from air containing volatile organic compound gases that have been volatilized and desorbed. Contaminated water treatment equipment that removes organic compound gas, and can easily and reliably aerate contaminated water as a whole and volatile organic compounds can be volatilized and desorbed. It is an object of the present invention to provide a contaminated water treatment apparatus capable of reducing the cost and removing the volatile organic compound gas from the air containing the volatile organic compound gas that has been volatilized and desorbed while suppressing the running cost .

The fourth problem is that a part of the contaminated water aeration apparatus that can solve the third problem and aerate the contaminated water containing the volatile organic compound to volatilize and desorb the volatile organic compound from the contaminated water. Contaminated water treatment can be easily transported and installed as a single unit, and can be easily installed in multiple stages according to the degree of contamination of the contaminated water, and with increased flexibility in the arrangement of each contaminated water aeration unit. It is to provide a contaminated water treatment apparatus capable of enhancing the capacity .

In order to solve the first problem, the present invention provides the following first and second contaminated water aeration apparatuses.
[1] A first contaminated water aeration apparatus is a contaminated water aeration apparatus that aerated contaminated water containing a volatile organic compound to volatilize and desorb the volatile organic compound from the contaminated water.
A pump for sucking and discharging contaminated water containing volatile organic compounds;
An aeration unit including one or two or more aeration nozzles that receive contaminated water supply from the pump and discharge the mixed water as air-water mixed water while aerated.
An air / water separation chamber for receiving air / water mixed water discharged from the aeration nozzle of the aeration unit and holding volatile organic compound gas-containing air released from the air / water mixed water;
The aeration nozzle is a nozzle that introduces and mixes air toward the squirting water flow by a negative pressure generated by the squirting water flow at the aeration nozzle,
The air / water separation chamber includes a water tank part that receives water discharged from the aeration nozzle of the aeration unit, a water discharge part for discharging water accumulated in the water tank part or flowing out for subsequent processing, and an upper part of the water tank part. A polluted water aeration apparatus comprising: a gas holding space portion; and a gas discharge portion for causing the volatile organic compound gas-containing air in the gas holding space portion to flow out for subsequent processing.

[2] A second contaminated water aeration apparatus comprising the first contaminated water aeration apparatus sequentially arranged adjacent to each other in a plurality of stages,
Among the contaminated water aeration apparatuses connected in a plurality of stages, the pump in the front stage contaminated water aeration apparatus sucks the contaminated water from the outside and supplies the contaminated water to the aeration nozzle of the aeration unit corresponding to the pump. Pump to
Of each adjacent contaminated water aeration apparatus, the water discharge part of the air / water separation chamber in the preceding stage contaminated water aeration apparatus is connected to the water inlet of the pump of the subsequent stage contaminated water aeration apparatus (directly or via a pipe or the like). Contaminated water aeration device connected.

(1-1) About the 1st contaminated water aeration apparatus According to the 1st contaminated water aeration apparatus, the aeration of contaminated water supplies the contaminated water to the aeration nozzle of the aeration unit with a pump, and converts it into the contaminated water with the aeration nozzle. It is performed by mixing air and releasing it as air-water mixed water while aerating, and the aeration nozzle is a nozzle that introduces and mixes air toward the ejected water flow by the negative pressure generated by the ejected water flow at the nozzle In addition, the contaminated water can be aerated easily, reliably and efficiently as a whole.

  The aerated mixed water aerated from the aeration nozzle is discharged to the water separation chamber and falls to the water tank section of the water / water separation chamber, or after being received by the water tank section, or aeration When a pipe that extends into the water tank is connected to the nozzle, the volatile organic compound easily volatilizes from the gas-water mixture in the water tank, desorbs from the water together with the air, and holds the gas above the water tank. Air containing volatile organic compound gas separated from water is held in the space.

  When there is no problem such as harming the human body even if the water collected in the water tank is discharged as it is, it can be discharged from the water discharge part as it is, or it can be discharged from the water discharge part for the next treatment. .

  The volatile organic compound gas-containing air that accumulates in the gas holding space can be discharged from the gas discharge unit to a volatile organic compound gas removal device or the like.

  According to the first contaminated water aeration apparatus, an air supply blower for aeration, which has been conventionally required, is not required, and the structure of the aeration nozzle can be simplified, so that the apparatus cost can be reduced. In addition, if the pump is operated, the contaminated water can be aerated and the volatile organic compound can be volatilized and desorbed, so that the running cost can be kept low.

The aeration nozzle includes a nozzle part for ejecting contaminated water sent from the pump, and a cylinder part for allowing the jet water flow from the nozzle part to pass through, and the cylinder part is inserted into the cylinder part by the jet water flow. The aeration nozzle which has the air introduction path which introduces air toward this jet water flow with the negative pressure which generate | occur | produces can be illustrated.
The same aeration nozzle can also be adopted for the aeration nozzle in the second contaminated water aeration apparatus, the later-described contaminated water aeration apparatus, and the contaminated water treatment apparatus.

As the water tank section of the air / water separation chamber, the discharged water discharged from the aeration nozzle of the aeration unit into the air / water separation chamber is separated into a high contamination level and a low contamination level, A water tank part including a first water tank part that receives the water discharged from the aeration nozzle of the aeration unit and a second water tank part that allows the overflow of the first water tank part to flow in can be exemplified. Thus, when a water tank part contains the 1st, 2nd water tank part, the said water discharge part can be provided with respect to this 2nd water tank part in which water with a lower pollution degree accumulates.
The same water tank part can be adopted for the water tank part in the second contaminated water aeration apparatus, the contaminated water aeration apparatus and the contaminated water treatment apparatus described later.

(2-1) Second contaminated water aeration apparatus The second contaminated water aeration apparatus includes a plurality of stages of the first contaminated water aeration apparatus, and the aeration treatment capacity of the contaminated water and the volatility from the contaminated water. It enhances the volatile desorption capacity of organic compounds.
As with the first contaminated water aeration apparatus, the contaminated water aeration apparatus at each stage can aerate contaminated water as a whole more easily and reliably and volatilely desorb volatile organic compounds. The running cost can be kept low. Therefore, the second contaminated water aeration apparatus as a whole can aerated contaminated water easily and surely and volatilely desorbs volatile organic compounds. The running cost can be kept low for a large contaminated water treatment capacity.

  In the second contaminated water aeration apparatus, the gas holding space portions of the air / water separation chambers of the first type of contaminated water aeration apparatus connected in a plurality of stages may communicate with each other.

  In order to simplify the structure of the second contaminated water aeration, the air / water separation chambers of the first contaminated water aeration apparatus connected in a plurality of stages are included in one integrated air / water separation chamber. Also good. The water tank portion and the gas holding space portion in each of the air / water separation chambers of the first contaminated water aeration apparatus connected to the plurality of stages are included in the integrated air / water separation chamber and connected to the plurality of stages. The gas discharge part of the steam / water separation chamber of the first contaminated water aeration apparatus may be integrated into one and provided for the integrated steam / water separation chamber.

[3] Contaminated water aeration apparatus for solving the second problem of the present invention In order to solve the second problem of the present invention,
The first and second contaminated water aeration apparatuses are also provided in which the whole is integrally assembled and unitized so that the whole can be transported and installed.

  A plurality of the first and second contaminated water aeration apparatuses are connected in series according to the degree of contamination of the contaminated water to be treated, even if they are assembled and integrated as a whole. Can also be used.

  However, both the first and second contaminated water aeration devices can be transported and installed easily by being assembled and united as a whole so that they can be transported and installed as a whole. It can be easily used in multiple stages according to the degree of contamination of the contaminated water, and connected in a highly flexible manner according to the situation (space, etc.) of the contaminated water aeration apparatus installation site. it can.

[4] Contaminated water treatment apparatus for solving the third and fourth problems of the present invention In order to solve the third problem, the present invention
A process in which contaminated water containing a volatile organic compound is aerated, the volatile organic compound is volatilized and desorbed from the contaminated water, and the volatile organic compound gas is removed from the air containing the volatilized and desorbed volatile organic compound gas. Is a contaminated water treatment device,
Volatility in which a gas inlet port is connected (directly or via a pipe or the like) to any one of the contaminated water aeration apparatus according to the present invention and a gas discharge part of the air / water separation chamber of the contaminated water aeration apparatus Provided is a contaminated water treatment apparatus comprising: an organic compound gas removal device; and a blower for drawing and passing air containing volatile organic compound gas from the gas discharge portion of the gas / water separation chamber to the volatile organic compound gas removal device. .

  The contaminated water aeration apparatus in the contaminated water treatment apparatus may be either the first contaminated water aeration apparatus or the second contaminated water aeration apparatus, or may be the unitized apparatus.

  According to this contaminated water treatment device, the contaminated water can be aerated easily and reliably in the contaminated water aeration device, and volatile organic compounds can be volatilized and desorbed as much as possible, and the running cost for that purpose is kept low. be able to. Further, the volatile organic compound gas-containing air accumulated in the gas holding space of the air / water separation chamber of the contaminated water aeration apparatus is drawn into the volatile organic compound gas removing apparatus by operating the blower, and the volatile organic compound The volatile organic compound gas can be removed from the gas-containing air.

  At this time, the capacity of the blower is such that the volatile organic compound gas-containing air accumulated in the gas holding space of the air / water separation chamber of the contaminated water aeration apparatus can be sucked and drawn into the volatile organic compound gas removal apparatus. Therefore, the power consumption is low, so that the running cost of the volatile organic compound gas removal process can be kept low.

The blower may be connected to the air discharge port of the volatile organic compound gas removal device (directly or via a pipe or the like).
The aeration unit in the contaminated water aeration apparatus is disposed in a cover chamber connected to the air / water separation chamber, and the cover chamber is provided with an air introduction port for introducing air into the cover chamber, You may connect the air discharge port of a blower to this air inlet part (it connects directly or via piping etc.).

With this configuration, the air heated by the operation of the blower can be supplied into the cover chamber and mixed with the contaminated water at the aeration nozzle of the aeration unit, thereby volatilizing the volatile organic compound from the contaminated water. Desorption can be performed smoothly.
In the present invention, an air heating means for heating the air sucked into the aeration nozzle of the aeration unit may be provided to facilitate the volatile desorption of the volatile organic compound from the contaminated water. When connecting to the air discharge port of the volatile organic compound gas removal apparatus and connecting the air discharge port of the blower to the air introduction port of the cover chamber, the blower also serves as an example of the air heating means I can say.

  The 4th subject which concerns on this invention can be solved by employ | adopting the said unitized contaminated water aeration apparatus as a contaminated water aeration apparatus.

According to the present invention, it is possible to achieve the second effect that is originally aimed for, which will be described later, but the following first effect and the like can also be achieved.
That is, according to the present invention, a contaminated water aeration apparatus that aerated contaminated water containing a volatile organic compound and volatilizes and desorbs the volatile organic compound from the contaminated water. To provide a polluted water aeration apparatus that can reliably aerate and devolatilize and desorb volatile organic compounds as much as possible and can keep running costs low (hereinafter collectively referred to as “first effect”). it can.

  According to the present invention, the first effect can be exhibited, and the whole can be easily transported and installed as a whole, easily arranged in multiple stages according to the degree of contamination of the contaminated water, and the arrangement of each. It is possible to provide a contaminated water aeration apparatus that can be continuously used with a high degree of freedom.

  According to the present invention, contaminated water containing a volatile organic compound is aerated to volatilize and desorb the volatile organic compound from the contaminated water, and the volatile organic compound is removed from the air containing the volatile organic compound gas. This is a contaminated water treatment device that removes gas, and it is easier and more reliable to aerate contaminated water as a whole, thereby volatile organic compounds can be volatilized and desorbed as much as possible. The volatile organic compound gas can be removed from the air containing the volatile organic compound gas that has been volatilized and desorbed at a low running cost (hereinafter collectively referred to as “second effect”). A contaminated water treatment apparatus can be provided.

  According to the present invention, the part of the contaminated water aeration apparatus that can exert the second effect and aerate the contaminated water containing the volatile organic compound to volatilize and desorb the volatile organic compound from the contaminated water is easily integrated. It can be transported and installed in multiple stages, and can easily be installed in multiple stages according to the degree of contamination of the contaminated water, and increase the degree of freedom of arrangement of each contaminated water aeration unit to increase the capacity of contaminated water treatment It is possible to provide a contaminated water treatment apparatus capable of

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an example A of a contaminated water treatment apparatus including an example 10 of the contaminated water aeration apparatus.

  The contaminated water aeration apparatus 10 in FIG. 1 has an air / water separation chamber 2 mounted and fixed on a pump installation portion 1 where a pump 11 is installed, and a cover chamber 3 is mounted and fixed on the air / water separation chamber. Inside, the aeration unit 4 is installed on the ceiling wall 21 of the air / water separation chamber 2, and these are integrally assembled so that they can be transported as a whole and installed at a desired ground location, It is unitized.

The aeration unit 4 includes two aeration nozzles 41 connected in parallel, and each aeration nozzle 41 is fixed to the ceiling wall 21 of the air / water separation chamber with its discharge port facing the air / water separation chamber 2. .
As shown in FIG. 2, the aeration nozzle 41 includes a nozzle portion 411 and a cylindrical portion 412 that allows water ejected from the nozzle portion to pass into the air-water separation chamber 2. The peripheral wall of the cylindrical portion 412 has a plurality of air introduction paths 413 at equal central angular intervals for introducing and mixing air from the outside of the cylindrical portion toward the ejected water by negative pressure generated in the cylindrical portion by the ejected water passing through the cylindrical portion. The book is formed. Each air introduction path 413 is formed in the direction of a line perpendicular to the center line of the nozzle portion 411 in the water ejection direction.

  In FIG. 1, P in the aeration unit 4 is a pressure gauge that detects the pressure of water supplied to the aeration unit 4, and V1 is a manual valve that can be closed as necessary during maintenance or the like.

  The cover chamber 3 is formed in an airtight manner, and includes an air inlet 311 on one side wall 31. Although the cover chamber 3 is formed in an airtight manner, an open / close door (not shown) is opened for maintenance and the like so that the inside can be accessed, and the door can be closed in an airtight manner.

Although the air / water separation chamber 2 is formed in an airtight manner, an opening / closing door (not shown) is opened for maintenance and the like so that the inside can be accessed, and the door can be airtightly closed.
A water tank part 22 is provided in the steam-water separation chamber 2, and a space above the water tank part 22 is a gas holding space part 23.
A gas discharge portion 231 is provided for the gas holding space portion 23. The gas discharge part 231 extends into the cover chamber 3 and reaches one side wall 31 of the cover chamber 3.

  The water tank unit 22 includes a first water tank unit 221 positioned below the aeration nozzle 41 and a second water tank unit 222 adjacent thereto. Each aeration nozzle 41 communicates with the inside of the first water tank section 221 through a pipe 42.

A water level detection sensor S <b> 2 is provided for the second water tank unit 222. The sensor S2 is suspended from the ceiling wall 21 of the air / water separation chamber.
The sensor S2 includes a common electrode e1 that reaches the vicinity of the bottom of the second water tank section 222, a water level lower limit detection electrode e2 that is adjacent to and slightly shorter than the common electrode e1, and a water level upper limit detection electrode e3 that is adjacent to the electrode e1. The water level information detected by the sensor S2 is input to the water level controller Cont.

A water discharge part 223 is provided at the bottom of the second water tank part 222. The water discharge part 223 extends to the pump installation part 1.
In FIG. 1, V2 is a manual valve connected to the bottom of each of the water tank units 221 and 222, and can be opened as needed during maintenance.

In this example, the pump 11 sucks contaminated water W1 containing a volatile organic compound, which is separately pumped from the ground and stored in the ground tank T, through the strainer (filter) ST, and aerated through the reducer R. It can be supplied to each aeration nozzle 41 of the unit 4.
In FIG. 1, reference numeral 111 denotes a priming water supply unit for supplying priming water to the pump when the pump is started.

The tank T is also provided with a water level sensor S1 having the same structure as the sensor S2. Water level information in the tank detected by the sensor S1 is also input to the water level control unit Cont.
The parts indicated by reference numerals H1, H2, 311 ′ in FIG. 1 will be described later.

A volatile organic compound gas removal device 5 is installed next to the contaminated water aeration device 10 described above. The gas removal apparatus 5 has an activated carbon filling part 51 in this example.
The gas removal device 5 has a gas introduction port 52 at the lower part and an air discharge port 53 at the upper part. The gas introduction port 52 is connected to the gas discharge unit 231 of the steam / water separation chamber 2 by piping, and the air discharge port 53 is connected to the air introduction port 311 of the cover chamber 3 by piping .
The activated carbon filling unit 51 can adsorb and remove the volatile organic compound gas from the volatile organic compound gas-containing air passing therethrough from below to above.

  According to the contaminated water treatment apparatus A described above, the contaminated water W1 in the tank T is supplied to each aeration nozzle 41 of the aeration unit 4 by the pump 11. The supply of the contaminated water W1 to the aeration nozzle 41 by the pump 11 indicates that the sensor S1 of the tank T does not show a decrease below the lower limit water level in the tank T under the instruction of the water level controller Cont. It is performed on condition that the sensor S2 of the second water tank unit 222 does not indicate an upward rise from the upper limit water level of the water level in the water tank unit.

  When the contaminated water W1 in the tank T is supplied to each aeration nozzle 41 of the aeration unit 4 by the pump 11, air is mixed with the contaminated water at each aeration nozzle 41 and aerated as the aerated water mixture. It is discharged into the first water tank part 221 of the separation chamber 2.

  At this time, each aeration nozzle 41 is a nozzle that introduces and mixes air toward the squirting water flow by the negative pressure generated by the squirting water flow at the nozzle, and therefore the contaminated water W1 supplied to the nozzle 41 is simplified as a whole. It is possible to reliably and efficiently aerate sufficiently.

  The aerated water / water mixture aerated from the aeration nozzle 41 is discharged to the air / water separation chamber 2 and received by the first water tank unit 221, and the volatile organic compound is easily volatilized from the water / water mixed water in the water tank unit, It desorbs from water together with air and is held in the gas holding space 23 above the water tank.

  Water W2 overflowing from the first water tank unit 221 flows into the second water tank unit 222. At this time, the volatile organic compound that may still remain in the water W2 is volatilized from the water W2 in the overflow from the first water tank unit 221 to the second water tank unit 222, and further in the second water tank unit 222. Desorbed and held in the gas holding space 23.

The water W2 collected in the second water tank part 221 can be discharged naturally from the water discharge part 223 when the volatile organic compound is removed to such an extent that the human body is not harmed. However, when the water W2 in the second water tank unit 221 is further processed, it may be discharged to the next processing apparatus. As the next processing apparatus, for example, a processing apparatus for removing iron or the like that may be contained in water can be cited.
Such a removal process of iron or the like may be performed before or after the aeration process of contaminated water and the volatile organic compound volatilization / desorption process.
Further, depending on the degree of contamination of the water W2, the water W2 may be further processed by one or more contaminated water aeration devices 10.

  On the other hand, the volatile organic compound gas-containing air a1 held in the gas holding space portion 23 is introduced into the gas removal device 5 by the operation of the blower 6, where the volatile organic compound gas is adsorbed and removed by the activated carbon filling portion 51, and thereafter The air a heated by the blower operation (for example, heated to about 40 ° C. to 50 ° C. or even higher temperature) is supplied from the blower 6 into the cover chamber 3 to aerate the contaminated water W1 in each aeration nozzle 41. Provided. In this way, the heated air a is subjected to contaminated water aeration, so that the volatile organic compounds are volatilized and desorbed from the contaminated water W1.

In addition, instead of supplying the discharge air from the blower 6 into the cover chamber 3 or supplying the discharge air from the blower 6 into the cover chamber 3, a heater for heating the air sucked into the aeration nozzle 41 is provided. It may be provided. For example, as shown by a chain line in FIG. 1, an air heater H1 is installed in the cover chamber 3 or an air heater H2 is attached to the air inlet 311 ′ of the cover chamber 3 and passes through the inside of the cover chamber 3 The air entering the inside may be heated, and a blower (not shown) for sending air into the cover chamber 3 through the heater H2 may be provided. Such air heating means using the heater H1 or the like may be employed instead of supplying the discharge air from the blower 6 into the cover chamber 3 or supplying the discharge air from the blower 6 into the cover chamber 3. Is possible.
These points are the same in the contaminated water aeration apparatus 100 and the contaminated water treatment apparatus B described later.

  According to the contaminated water aeration apparatus 10 of the contaminated water treatment apparatus described above, an air supply blower or the like for aeration that has been conventionally required is not required, and the structure of the aeration nozzle can be simplified. The apparatus cost can be kept low, and if the pump 11 is operated, the aeration of contaminated water and the volatile organic compound can be volatilized and desorbed, so that the running cost can be kept low.

  In addition, the contaminated water aeration apparatus 10 can be easily transported and installed by paying attention to this, because the whole is integrally assembled and unitized so that it can be transported and installed as a whole. In addition, it can be easily used in a plurality of stages according to the degree of contamination of the contaminated water, and can be arranged in series with a high degree of freedom in arrangement according to the situation (space, etc.) of the contaminated water aeration apparatus installation site.

Further, when viewed as the entire contaminated water treatment apparatus A, the contaminated water can be aerated easily and reliably by the contaminated water aeration apparatus 10 as a whole, and the volatile organic compounds can be volatilized and desorbed as much. Running costs can be kept low. Furthermore, draws volatile organic compound gas containing air accumulated in the gas holding space 23 of the steam-water separating chamber 2 of the contaminated water aerator 10 driving a blower 6 from the gas discharge unit 231 to the volatile organic compound gas removal device 5 The volatile organic compound gas can be removed from the air containing the volatile organic compound gas.

  At this time, the capability of the blower 6 is that the volatile organic compound gas-containing air a <b> 1 accumulated in the gas holding space 23 of the steam / water separation chamber 2 of the contaminated water aeration apparatus 10 is sucked and drawn into the volatile organic compound gas removal apparatus 5. Since it is sufficient that it can be passed, the power consumption is low, and therefore the running cost of the volatile organic compound gas removal process can be kept low.

  Further, in the case of the contaminated water treatment apparatus A, the part of the contaminated water aeration apparatus 10 that aerates the contaminated water W1 containing the volatile organic compound and volatilizes and desorbs the volatile organic compound from the contaminated water is easily integrated. Can be easily installed in multiple stages according to the degree of contamination of the contaminated water W1, and each of the contaminated water aeration devices 10 can be added with a high degree of freedom. It is possible to increase the capacity to treat contaminated water.

Next, an example B of the contaminated water treatment apparatus including another example 100 of the contaminated water aeration apparatus according to the present invention will be described with reference to FIG.
The contaminated water aeration apparatus 100 is simplified by connecting the contaminated water aeration apparatus 10 shown in FIG. 1 adjacent to each other in two stages and integrating the air / water separation chamber into one. The volatile organic compound gas removal device 5B and the blower 6B provided together with the aeration device 100 are provided with the gas removal device 5 of FIG. 1 in order to improve the gas removal capability in accordance with the increase in the processing capability of the aeration device 100. The basic structure is the same as that of the gas removing device 5 and the blower 6 although it is larger than the blower 6.

  The contaminated water aeration apparatus 100 mounts and fixes the air / water separation chamber 2B on the pump installation portion 1B where the pumps 11 and 12 are installed, and mounts and fixes the cover chamber 3B on the air / water separation chamber. Inside, two aeration units 4 are installed on the ceiling wall 21B of the air / water separation chamber 2B. These are integrally assembled and unitized so that they can be transported as a whole and installed at a desired ground location.

  Each aeration unit 4 has the same structure as the aeration unit 4 in the aeration apparatus 10 of FIG. Portions such as the aeration nozzle 41 related to the aeration unit 4 are denoted by the same reference numerals as those in FIG.

  The cover chamber 3B is formed in an airtight manner, and includes an air inlet 311B on one side wall 31B. Although the cover chamber 3B is formed in an airtight manner, an open / close door (not shown) is opened for maintenance and the like so that the inside can be accessed, and the door can be closed in an airtight manner.

Although the air / water separation chamber 2B is formed in an airtight manner, an open / close door (not shown) is opened for maintenance and the like so that the inside can be accessed, and the door can be closed in an airtight manner. In the steam / water separation chamber 2B, the water tank parts 22 similar to those in the aeration apparatus 10 of FIG. 1 are provided adjacently in two stages, and the upper space of the water tank parts 22 holds a common gas for each water tank part. It is a space portion 23B.
A gas discharge portion 231B is provided for the gas holding space portion 23B. The gas discharge part 231B extends into the cover chamber 3B and reaches one side wall 31B of the cover chamber 3B.

  Each water tank unit 22 includes a first water tank unit 221 positioned below the aeration nozzle 41 and a second water tank unit 222 adjacent thereto. Each aeration nozzle 41 communicates with the inside of the first water tank section 221 through a pipe 42.

  The same water level detection sensor S2 as that in the apparatus 10 of FIG. A water level detection sensor S3 having the same structure is provided for the second water tank section 222 at the rear stage. The water level information detected by the sensors S2 and S3 is input to the water level controller Cont.

A water discharge part 223 </ b> B is provided at the bottom of each second water tank part 222. The water discharge part 223B extends to the pump installation part 1B.
In FIG. 3, V2 is a manual valve connected to the bottom of each of the water tank portions 221 and 222, and can be opened as needed during maintenance.

In this example, the pump 11 sucks the volatile organic compound-containing contaminated water W1 separately pumped from the ground and accommodated in the ground tank T through the strainer (filter) ST, and passes through the reducer R to the previous stage. It can supply to each aeration nozzle 41 of the aeration unit 4.
The pump 12 can supply the water in the water tank part 222 from the water discharge part 223 </ b> B of the second water tank part 222 at the front stage to each aeration nozzle 41 of the aeration unit 4 at the rear stage.
In FIG. 3, reference numeral 111 denotes a priming water supply unit for supplying priming water to the pump 11 when the pump 11 is started.

  Also in FIG. 3, the tank T is provided with a water level sensor S1 having the same structure as the sensor S2. Water level information in the tank detected by the sensor S1 is also input to the water level control unit Cont.

A volatile organic compound gas removal device 5B is installed next to the contaminated water aeration device 100 described above. The gas removal device 5B has an activated carbon filling part 51B inside.
The gas removing device 5B has a gas introduction port portion 52B at the lower portion and an air discharge port portion 53B at the upper portion.
The gas introduction port 52B is connected to the gas discharge part 231B of the steam / water separation chamber 2B by piping, and the air discharge port 53B is connected to the air introduction port 311B of the cover chamber 3B by piping.

  According to the contaminated water treatment apparatus B described above, the contaminated water W1 in the tank T is supplied to each aeration nozzle 41 of the aeration unit 4 in the previous stage by the pump 11. The supply of the contaminated water W1 to the aeration nozzle 41 by the pump 11 indicates that the sensor S1 of the tank T does not show a decrease below the lower limit water level in the tank T under the instruction of the water level controller Cont. It is performed on condition that the sensor S2 of the second water tank unit 222 does not indicate an upward rise from the upper limit water level of the water level in the water tank unit.

  When the contaminated water W1 in the tank T is supplied to each aeration nozzle 41 of the upstream aeration unit 4 by the pump 11, the air is mixed with the contaminated water at each aeration nozzle 41 and aerated as air-water mixed water. It is discharged to the first water tank section 221 in the previous stage of the water separation chamber 2. At this time, the contaminated water W <b> 1 supplied to the nozzle 41 can be aerated sufficiently easily, reliably and efficiently as a whole.

  The aerated water mixture aerated from the preceding aeration nozzle 41 is discharged to the air / water separation chamber 2 and received by the first water tank part 221 in the preceding stage, and volatile organic compounds are easily formed from the air / water mixed water in the water tank part. Volatilizes, desorbs from the water together with air, and is held in the gas holding space 23B above the water tank.

  Water W2 overflowing from the first water tank section 221 in the previous stage flows into the second water tank section 222 in the previous stage. At this time, the volatile organic compound that may still remain in the water W2 is volatilized and desorbed in the second water tank part 222 when it overflows from the first water tank part 221 to the second water tank part 222, and gas It is held in the holding space 23B.

  The water W2 accumulated in the second water tank section 222 in the front stage is supplied to each aeration nozzle 41 of the aeration unit 4 in the rear stage by the pump 12 in the rear stage. It becomes water and is received by the first water tank unit 221 in the subsequent stage, and the volatile organic compound is easily volatilized from the air-water mixed water in the water tank unit, desorbs from the water together with the air, and the gas holding space part above the water tank unit 23B.

The supply of the water W2 to the aeration nozzle 41 by the pump 12 is based on the instruction from the water level control unit Cont that the sensor S2 does not show a decrease below the lower limit water level of the water level in the front water tank unit 222 and the second stage. This is performed on condition that the sensor S3 of the two water tank section 222 does not indicate an upward rise from the upper limit water level of the water level in the water tank section.
Water W3 overflowing from the first water tank section 221 at the rear stage flows into the second water tank section 222 at the rear stage. At this time, the volatile organic compound that may still remain in the water W3 is volatilized and desorbed and held in the gas holding space 23B.

The water W3 accumulated in the second water tank section 221 at the rear stage can be discharged naturally from the water discharge section 223B when the volatile organic compound is removed to such an extent that the human body is not harmed. However, when the water W3 in the second water tank unit 221 is further processed, it may be discharged to the next processing apparatus. As the next processing apparatus, for example, a processing apparatus for removing iron or the like that may be contained in water can be cited.
Such a removal process of iron or the like may be performed before or after the aeration process of contaminated water and the volatile organic compound volatilization / desorption process.
Further, depending on the degree of contamination of the water W3, the water W3 may be further processed by one or more contaminated water aeration apparatuses 100.

  On the other hand, the volatile organic compound gas-containing air a1 held in the gas holding space portion 23B is introduced into the gas removing device 5B by the operation of the blower 6B, where the volatile organic compound gas is adsorbed and removed by the activated carbon filling portion 51B. The air a heated by the blower operation (for example, heated to about 40 ° C. to 50 ° C. or higher temperature) is supplied from the blower 6B into the cover chamber 3B, and the contaminated water W1 and W2 in each aeration nozzle 41 are supplied. It is subjected to aeration. As described above, the heated air a is subjected to contaminated water aeration, so that volatile organic compounds from the contaminated water W1 and W2 can be volatilized and desorbed.

  Also in the contaminated water aeration apparatus 100 of the contaminated water treatment apparatus B described above, an air supply blower or the like for aeration is not required, and the structure of the aeration nozzle can be simplified, so that the apparatus cost can be reduced. When the pumps 11 and 12 are operated, aeration of contaminated water and volatilization / desorption of volatile organic compounds can be performed, so that the running cost can be reduced.

  In addition, the polluted water aeration apparatus 100 can be easily transported and installed by paying attention to the fact that the whole is integrally assembled and unitized so that it can be transported and installed as a whole. In addition, it can be easily used in a plurality of stages according to the degree of contamination of the contaminated water, and can be arranged in series with a high degree of freedom in arrangement according to the situation (space, etc.) of the contaminated water aeration apparatus installation site.

  Further, when viewed as a whole of the contaminated water treatment apparatus B, the contaminated water aeration apparatus 100 can aspirate the contaminated water as a whole easily and surely, and volatile organic compounds can be volatilized and desorbed as well. Running costs can be kept low. Further, the volatile organic compound gas-containing air that accumulates in the gas holding space 23B of the steam / water separation chamber 2B of the contaminated water aeration apparatus 100 by operating the blower 6B is drawn from the gas discharge part 223B to the gas removal device 5B. The volatile organic compound gas can be removed from the organic compound gas-containing air.

  At this time, the capability of the blower 6B is that the volatile organic compound gas-containing air a1 accumulated in the gas holding space 23B of the steam separation chamber 2B of the contaminated water aeration apparatus 100 is sucked and drawn into the gas removal device 5B. Since it is sufficient as much as possible, the power consumption is low, and therefore the running cost of the volatile organic compound gas removal process can be kept low.

  Further, when viewed as the contaminated water treatment apparatus B, the part of the contaminated water aeration apparatus 100 can be easily transported and installed integrally, and easily in multiple stages according to the degree of contamination of the contaminated water W1, and In addition, it is possible to increase the degree of freedom of arrangement of each contaminated water aeration apparatus 100, thereby increasing the capacity of treating contaminated water.

  The present invention aeration treatment of contaminated water such as groundwater contaminated with volatile organic compounds to volatilize and desorb volatile organic compounds, and further volatile organic compounds from air containing volatile organic compound gas that has been volatilized and desorbed. It can be used to remove the compound gas.

It is a figure which shows the example of the contaminated water processing apparatus containing one example of a contaminated water aeration apparatus . It is sectional drawing of an aeration nozzle. It is a figure which shows the other example of the contaminated water processing apparatus containing the other example of a contaminated water aeration apparatus . It is a figure which shows the example of the conventional contaminated water aeration apparatus.

Explanation of symbols

A, B Contaminated water treatment device 10, 100 Contaminated water aeration device 1, 1B Pump installation unit 11, 12 Pump 111 Nominal water introduction unit R Reducer 2, 2B Air / water separation chamber 21, 21B Ceiling wall 22 Water tank unit 221 First water tank unit 222 2nd water tank part 223, 223B Water discharge part 23, 23B Gas holding space part 231, 231B Gas discharge part 3, 3B Cover chamber 31, 31B One side wall 311, 311 ', 311B Air inlet part 4 Aeration unit 41 Aeration nozzle 411 Nozzle portion 412 Cylindrical portion 413 Air introduction path 42 Pipe V1, V2 Valve P Pressure gauge 5, 5B Volatile organic compound gas removal device 51, 51B Activated carbon filling portion 52, 52B Gas introduction port portion 53, 53B Air discharge port Sections 6 and 6B Blower ST Strainer T Tanks S1, S2, S3 Water level detection sensors e1, e2, e3 Electrode Co t level control unit W1, W2, W3 water a1 volatile organic compound gas containing air a air H1, H2 air heater

Claims (2)

A process in which contaminated water containing a volatile organic compound is aerated, the volatile organic compound is volatilized and desorbed from the contaminated water, and the volatile organic compound gas is removed from the air containing the volatilized and desorbed volatile organic compound gas. Is a contaminated water treatment device,
Contaminated water aeration apparatus connected in multiple stages in sequence, adjacent to each other and transported and installed as a whole. A gas removal device and a blower for drawing and passing air containing volatile organic compound gas to the volatile organic compound gas removal device,
Each of the contaminated water aeration apparatuses is a contaminated water aeration apparatus that aerates contaminated water containing a volatile organic compound and volatilizes and desorbs the volatile organic compound from the contaminated water.
A pump for sucking and discharging contaminated water containing volatile organic compounds;
An aeration unit including one or two or more aeration nozzles that receive contaminated water supply from the pump and discharge the mixed water as air-water mixed water while aerated.
An air / water separation chamber for receiving air / water mixed water discharged from the aeration nozzle of the aeration unit and holding volatile organic compound gas-containing air released from the air / water mixed water;
The aeration nozzle includes a nozzle part for ejecting contaminated water sent from the pump, and a cylinder part for allowing a jet water flow from the nozzle part to pass through, and the cylinder part is inserted into the cylinder part by the jet water flow. It has an air introduction path for introducing and mixing air toward the jet water flow by the generated negative pressure,
The air / water separation chamber includes a water tank part that receives water discharged from the aeration nozzle of the aeration unit, a water discharge part for discharging water accumulated in the water tank part or flowing out for subsequent processing, and an upper part of the water tank part. A gas holding space part, and a gas discharge part for causing the volatile organic compound gas-containing air in the gas holding space part to flow out for the next processing ,
The water tank section of the air / water separation chamber includes a first water tank section that receives water discharged from the aeration nozzle of the aeration unit, and a second water tank section that allows the overflow of the first water tank section to flow in, A water discharge part is provided for the second water tank part,
Among the contaminated water aeration devices connected in a plurality of stages adjacent to each other in sequence, the pump in the foremost contaminated water aeration device sucks the contaminated water from the outside and supplies the contamination to the aeration nozzle of the aeration unit corresponding to the pump. A pump for supplying water,
The water discharge part of the air / water separation chamber in the preceding stage contaminated water aeration apparatus among the adjacent contaminated water aeration apparatuses is connected to the water inlet of the pump of the subsequent stage contaminated water aeration apparatus,
The gas holding space portions of the air / water separation chambers of the contaminated water aeration apparatus connected to the plurality of stages communicate with each other,
The volatile organic compound gas removal device has a gas inlet port connected to a gas discharge portion of a water separation chamber of the contaminated water aeration device,
The blower for drawing and passing the volatile organic compound gas-containing air to the volatile organic compound gas removing device volatilizes from the gas discharge part of the air / water separation chamber of the contaminated water aeration device to the volatile organic compound gas removing device. A blower for drawing in and passing air containing organic organic compound gas,
Air heating means for heating the air sucked into the aeration nozzle of the aeration unit,
The blower is connected to an air discharge port of the volatile organic compound gas removal device, and the aeration unit is disposed in a cover chamber connected to the air / water separation chamber. An air introduction port for introducing air into the cover chamber is provided, and an air discharge port of the blower is connected to the air introduction port, and the blower serves as at least a part of the air heating means. contaminated water treatment apparatus characterized by being constructed. The air / water separation chamber of the contaminated water aeration apparatus connected to the plurality of stages is included in one integrated air / water separation chamber, and each of the air / water separation chambers of the contaminated water aeration apparatus connected to the plurality of stages is provided. The water tank part and the gas holding space part are included in the integrated air / water separation chamber, and the gas discharge parts of the air / water separation chamber of the contaminated water aeration apparatus connected to the plurality of stages are integrated into one. The contaminated water treatment apparatus according to claim 1, which is provided for the integrated air / water separation chamber.