JP2001276817A - Contaminated oil effluent treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contaminated soil effluent treating device which efficiently treats the contaminated soil effluent discharged from the cathode side of electrode pairs inserted into the contaminated soil with a simple treating means and makes the soil uncontaminated. SOLUTION: The contaminated water sucked from the water permeable pipe-like cathode 22 of the electrode pairs inserted into the contaminated soil 40 is cleaned by powder and granular adsorbents 30 in a mixing tank 29 and the treated water thereof is refluxed to an anode 21. Since the contaminated adsorbents are put into a dry state during the transfer by transfer means 32, 35 and 36 and are fed into a hopper 1 of a waste treating device, a steam explosion in a kiln 3 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detoxifying soil contaminated with compounds such as heavy metals, and more particularly to an apparatus for treating soil discharge water containing pollutants.

[0002]

2. Description of the Related Art Conventionally, as a means for improving soil contaminated with compounds such as heavy metals, an electrode pair is inserted into contaminated soil, and discharged water containing contaminants collected on the cathode side thereof is used.
Means for extracting contaminated soil discharged water have been developed, but technology development for efficiently and continuously treating the whole process for detoxification is awaited.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to efficiently treat decontaminated soil discharge water taken out from the cathode side of the electrode pair inserted into the contaminated soil by simple treatment means so as to be harmless. It is an object to provide a contaminated soil discharge water treatment device.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a contaminated soil discharge water treatment apparatus of the present invention is designed to suction and discharge contaminated water from a water-permeable pipe-shaped cathode of an electrode pair inserted into contaminated soil. A vacuum pump installed in the vicinity of the cathode, a mixing tank connected to the outlet of the vacuum pump, and an adsorbent receiver provided above the mixing tank to supply the particulate adsorbent to the mixing tank A hopper, a drain pump for sucking and discharging treated water purified by adsorbing contaminants by the adsorbent in the mixing tank, and a contaminant adsorbent generated by the adsorbent adsorbing contaminants in the mixing tank. And a transport means for carrying the contaminated adsorbent after drying as waste into a waste treatment apparatus.

Further, in the contaminated soil discharge water treatment apparatus according to the present invention, the waste treatment apparatus includes a plurality of waste supply hoppers connected to the conveying means, and a push-in type receiving waste supply from the hopper. A feeder, a slender inclined rotary kiln for thermally decomposing waste pushed by the feeder, and a rotating means of the rotary kiln;
A heater that surrounds and heats the outer periphery of the rotary kiln; and a gas that is generated by pyrolysis of waste in the rotary kiln and is exhausted from the rotary kiln through a filter to exhaust the interior of the rotary kiln to a reduced pressure state with less oxygen content. A blower and a plurality of cooling collection hoppers for collecting, cooling, and discharging the ash generated in the pyrolysis process from the rotary kiln, and sequentially from the plurality of waste supply hoppers to the push-in type feeder. A first switching valve for supplying waste material, and a second switching valve for sequentially and continuously sending out ash from the rotary kiln to the plurality of cooling collection hoppers, and The heating function of the heater changes the temperature distribution inside the rotary kiln. And the highest temperature at the central portion of the kiln, is characterized in that it is set to be low at both end portions of the rotary kiln.

[0006] Furthermore, the contaminated soil discharge water treatment apparatus of the present invention is characterized in that the waste treatment apparatus is mounted on a trailer towed by a tractor.

[0007] The apparatus for treating contaminated soil discharged water of the present invention comprises:
The conveying means is provided with a conveyor that receives the contaminant adsorbent from the lower opening and closing port of the mixing tank and conveys the contaminated adsorbent in a horizontal direction, and the drying means is configured as a heater mounted on an enclosure of the conveyor, An exhaust fan for sucking and discharging water vapor generated from the pollution adsorbent heated by the heater is provided.

Further, the contaminated soil discharge water treatment apparatus of the present invention comprises a bucket conveyor with a surrounding wall for lifting the contaminant adsorbent discharged from the conveyor at an end portion of the conveyor, and an upper end discharge portion of the bucket conveyor. And a chute having a closed structure for receiving the contaminated adsorbent and carrying the contaminated adsorbent into the waste treatment apparatus.

In the above-described apparatus for treating contaminated soil discharged water according to the present invention, contaminated water containing contaminants such as heavy metals collected at the water-permeable pipe-shaped cathode of the electrode pair inserted into the contaminated soil is pumped by a vacuum pump. Sucked and discharged, guided to the mixing tank,
The contaminants are efficiently adsorbed and removed by the particulate adsorbent in the same tank, and the treated water thus purified is separated and discharged by the drain pump. Since the contaminant adsorbent that has adsorbed the contaminants is sufficiently dried by the drying means, the waste adsorber receives the contaminant adsorbent as waste through the conveying means and heat-treats it. It can be safely and efficiently treated and detoxified without causing any wake up.

[0010] In the above-mentioned waste treatment apparatus, the inside of the rotary kiln is heated to the highest temperature at the center of the rotary kiln by a heater surrounding the outer periphery of the rotary kiln and heated by an exhaust blower connected to the rotary kiln. Since the inside of the rotary kiln is depressurized and has a low oxygen content, the waste pushed into the rotary kiln from the waste supply hopper through the push-in feeder is rotated by the rotary means. In conjunction with this, the thermal decomposition treatment is performed efficiently.

A plurality of the waste supply hoppers are provided, and the wastes are sequentially and continuously supplied from the respective hoppers into the rotary kiln via the first switching valve and the push-in feeder. As the ash generated by the pyrolysis of waste in the rotary kiln is continuously discharged from the rotary kiln to the plurality of cooling collection hoppers through the second switching valve in sequence, the internal temperature of the rotary kiln is controlled as described above. Combined with the highest temperature in the central part of the kiln by the heater, the waste is rolled down while receiving appropriate high-temperature treatment in a slender cylindrical inclined rotary kiln, and is continuously pyrolyzed efficiently. Will be given.

The gas generated by subjecting the waste to thermal decomposition in the rotary kiln as described above is sucked and discharged by the exhaust blower through a filter.
On the other hand, the ash generated by the thermal decomposition treatment of the waste is cooled by a cooling type collection hopper and discharged.

Further, if the waste treatment apparatus is of a vehicle-mounted type mounted on a trailer towed by a tractor, it is possible to see when the polluting adsorbent is sufficiently stored on site and discard the waste. Since the waste disposal equipment can be transferred to the site and the waste disposal operation can be performed while the equipment is mounted on the trailer, there is an advantage that the operation efficiency of the equipment is improved.

[0014] Conveying means for sending the contaminated adsorbent discharged from the mixing tank to the waste treatment apparatus is provided with a conveyor for receiving the contaminated adsorbent from the lower opening of the mixing tank and conveying the contaminated adsorbent in the horizontal direction. If a heater as a drying means is provided on the surrounding wall of the conveyor, the contaminant adsorbent is efficiently dried in the process of being conveyed to the waste treatment apparatus, and water vapor generated by the drying is exhausted. Since it is forcibly discharged by the fan,
Drying of the contaminant adsorbent is performed more efficiently, and safety in preventing steam explosion at the time of heat treatment of the contaminant adsorbent in the waste treatment apparatus can be sufficiently improved.

At the end of the conveyor, the contaminant adsorbent discharged from the conveyor is lifted upward by a bucket conveyor in the surrounding wall, and further carried into the waste disposal apparatus via a sealed chute. Therefore, the pollution adsorbent is not scattered to the outside as dust, and air pollution can be sufficiently prevented.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view schematically showing a configuration of a contaminated soil discharge water treatment apparatus according to an embodiment of the present invention. In the present embodiment, an electrode pair composed of a water-permeable pipe-shaped anode 21 and cathode 22 is inserted into soil 40 contaminated with a compound such as heavy metal, and an AC / DC converter 23 is connected between both electrodes. I have.

Then, chelating water is introduced into the anode 21 by a pipe 24 so as to penetrate into the contaminated soil through a number of small holes in the pipe wall of the anode 21. Since the contaminated water thus obtained enters the pipe through a number of small holes in the pipe wall, the contaminated water thus obtained is sucked through a pipe 26 by a vacuum pump 25 with a motor 25a installed near the cathode 22, and the valve 27
Through the mixing tank 29. As a chelate in the chelate water, for example, a powdery chromium adsorbent (trade name: chrome zero) or the like is used.

Above the mixing tank 29, there are provided a plurality of hoppers 28 for receiving an adsorbent such as powdered activated carbon, and the adsorbent 30 dropped uniformly into the mixing tank 30 through the hopper 28. Contaminated water is to be mixed.

A drain pump 31 with a motor 31a is connected to the terminal end of the mixing tank 29. The pump 31 sucks the treated water and returns the treated water to a chelating water introducing section 38 through a pipe 37.

Further, the contaminant adsorbent that has adsorbed the contaminants in the mixing tank 29 drops into the conveyor enclosure 33 by opening the lower opening / closing lid of the tank 29.
A screw conveyor 32, which is driven to rotate by a motor 32a, is horizontally disposed in the surrounding wall 33.
At the end portion of the bucket 32, a bucket conveyor 35 with a surrounding wall is provided to receive the contaminated adsorbent transferred by the conveyor 32 and lift it upward. The rotation of the conveyor 35 is performed by the rotation drive unit 34.

A heater (not shown) for drying the contaminant adsorbent is provided on the surrounding wall 33 of the screw conveyor 32, and a duct 39a for sucking and discharging water vapor generated by drying is connected to an end of the surrounding wall 33. An exhaust fan 39 extends upward along the surrounding wall of the bucket conveyor 35, and is provided at an upper end outlet of the duct 39a. A chute 36 having a closed structure is provided for receiving the contaminant adsorbent from the upper end discharge portion of the bucket conveyor 35 and carrying it into the hopper 1 of the waste disposal apparatus.

In the present embodiment, the waste disposal apparatus is mounted on a trailer B towed by a tractor A via a detachable joint J. The apparatus is configured as follows. That is, a plurality of waste supply hoppers 1 and 1 are arranged side by side so as to have an airtight opening / closing lid 1a, and a nitrogen gas generator 2 is connected to each hopper 1.

A slender cylindrical inclined rotary kiln 3 for thermally decomposing the waste is provided, and both ends of the rotary kiln 3 are provided with fixed gas receiving seals 4 and 5 respectively in fixed receiving portions 4 and 5. It is rotatably supported via a hermetically sealed bearing portion 6 provided with a seal. The rotation of the rotary kiln 3 is performed by a motor 7 via a gear 8.

Further, a heater 9 which surrounds the outer periphery of the rotary kiln 3 and can be heated to about 600 ° C. is provided, and in combination with the electric or gas combustion type heating function of the heater 9, the rotary kiln 3 Make up. The heating function of the heater 9 is set such that the temperature distribution inside the elongated rotary kiln 3 is highest at the center of the rotary kiln 3 and lower at both ends of the rotary kiln 3.

The supply of waste from the hopper 1 to the upper end of the rotary kiln 3 inclined up and down is performed by a first switching valve 10.
And push-in feeder (screw feeder) 11
The operation of the push-in feeder 11 is performed by a motor 12.

The switching control of the first switching valve 10 is performed by a controller (not shown) so that the waste can be sequentially and continuously supplied from the plurality of waste supply hoppers 1 to the push-in feeder 11. Has become. That is, when two waste supply hoppers 1 and 1 are provided, while the waste supply from one hopper 1 to the push-in feeder 11 via the first switching valve 10 is performed, the other waste supply hoppers 1 are provided. Hopper 1
In this case, the operation of filling the waste is performed. Therefore, by the switching operation of the first switching valve 10, the waste is continuously and continuously supplied to the push-in feeder 11 and the rotary kiln 3.

The gas discharged from the end of the rotary kiln 3 is sucked by an exhaust blower 14 through a water-cooled gas-cooled trap 12 and a filter 13 and discharged from a chimney 16 through an off-gas processing system 15. Has become.

Further, the ash as a solid discharged from the lower end of the rotary kiln 3 is continuously and sequentially sent out to a plurality of cooling type collecting hoppers 17 through a second switching valve 10a controlled by a controller (not shown). It is supposed to be.

That is, the two water-cooled collection hoppers 17, 17
Is provided, the ash is discharged from the other hopper 17 while the ash is being delivered to the one hopper 17 via the second switching valve 10a, so that the second switching valve 10a By this switching operation, the ash is continuously and continuously delivered from the lower end of the rotary kiln 3 without interruption.
Reference numeral 18 denotes a power supply input terminal.

In the above-described apparatus for treating contaminated soil discharged water according to the present embodiment, contaminated water containing contaminants such as heavy metals collected in the water-permeable pipe-shaped cathode 22 of the electrode pair inserted into the contaminated soil 40 is used. Mixing tank sucked and discharged by vacuum pump 25
The contaminant is efficiently adsorbed and removed by the particulate adsorbent 30 in the tank, and the treated water thus purified is separated and discharged by the drain pump 31. The contaminant adsorbent that has adsorbed the contaminants is sufficiently dried by a heater attached to the surrounding wall 33 as a drying means. In the treatment device, the treatment is performed safely and efficiently without causing steam explosion and the like, and the treatment device is rendered harmless.

Further, in the above-mentioned waste treatment apparatus, the inside of the rotary kiln 3 is heated to the highest temperature at the center of the rotary kiln 3 by the heater 9 which surrounds and heats the outer periphery of the rotary kiln 3, and is connected to the rotary kiln 3. The inside of the rotary kiln 3 is decompressed by the exhaust blower 14 and the oxygen content is reduced, so that the waste (contamination adsorbent) pushed into the rotary kiln 3 from the waste supply hopper 1 through the push-in feeder 11 is removed. In (2), the rotary kiln 3 is rotationally driven by the rotating means 7 and 8, so that the thermal decomposition treatment is efficiently performed.

A plurality of waste supply hoppers 1 are provided, and the rotary kiln 3 is successively and continuously supplied from each hopper via the first switching valve 10 and the push-in feeder 11.
As the waste is supplied to the inside, the ash generated by the pyrolysis of the waste in the rotary kiln 3 is continuously discharged from the rotary kiln 3 to the plurality of cooling collection hoppers 17 via the second switching valve 10a. In combination with the fact that the internal temperature of the rotary kiln 3 is set to the highest temperature in the central part of the kiln by the heater 9, the waste is rotated in the elongated cylindrical inclined rotary kiln 3 while being appropriately heated. It moves and descends, and the thermal decomposition treatment is continuously and efficiently performed.

The gas generated by subjecting the waste to thermal decomposition in the rotary kiln 3 is sucked and discharged by the exhaust blower 14 through the filter 13. On the other hand, the ash generated by the thermal decomposition treatment of the waste is cooled by a cooling type collection hopper and discharged.

Further, since the waste treatment apparatus is of a vehicle-mounted type mounted on a trailer towed by a tractor, it is possible to check the time when the contaminated adsorbent is sufficiently stored on site and discard the waste. The waste disposal apparatus can be transported to the site, and the waste disposal operation can be performed while the apparatus is mounted on the trailer B. As a result, the operation efficiency of the facility can be improved.

The conveying means for sending the contaminated adsorbent discharged from the mixing tank 29 to the waste treatment device is provided by the mixing tank.
29 is provided with a conveyor 32 which receives the contaminant adsorbent from the lower opening of the conveyor 29 and conveys it horizontally.
Is provided with a heater as a drying means, so that the contaminated adsorbent is efficiently dried in the process of being conveyed to the waste treatment apparatus, and the steam generated by the drying is forcibly forced by the exhaust fan 39. , The contaminant adsorbent is dried more efficiently,
The safety in preventing steam explosion at the time of heating the contaminated adsorbent in the kiln 3 of the waste treatment apparatus can be sufficiently improved.

At the end of the conveyor 32, the contaminant adsorbent discharged from the conveyor 32 is transferred to the bucket conveyor 35 in the enclosure.
And lifted upwards, and then carried into the waste disposal unit via the sealed chute 36.Therefore, there is no need to disperse the polluting adsorbent as dust to the outside. Can be prevented.

[0037]

As described in detail above, according to the continuous waste disposal apparatus of the present invention, the following effects can be obtained. (1) Contaminated water containing contaminants such as heavy metals collected at the water-permeable pipe-shaped cathode of the electrode pair inserted into the contaminated soil is sucked and discharged by a vacuum pump and guided to a mixing tank,
The contaminants are efficiently adsorbed and removed by the particulate adsorbent in the same tank, and the treated water thus purified is separated and discharged by the drain pump. Since the contaminant adsorbent that has adsorbed the contaminants is sufficiently dried by the drying means, the waste adsorber receives the contaminant adsorbent as waste through the conveying means and heat-treats it. It can be safely and efficiently treated and detoxified without causing any wake up. (2) In the waste treatment apparatus, the inside of the rotary kiln is heated to the highest temperature at the center of the rotary kiln by a heater that surrounds and heats the outer periphery of the rotary kiln, and the rotary kiln is exhausted by an exhaust blower connected to the rotary kiln. Since the inside is decompressed and is in a state of low oxygen content, the waste pushed into the rotary kiln from the waste supply hopper via the push-in feeder is coupled with the rotary kiln being rotationally driven by the rotating means. The thermal decomposition treatment is performed efficiently. A plurality of the waste supply hoppers are provided, and waste is sequentially and continuously supplied from the respective hoppers into the rotary kiln via the first switching valve and the push-in feeder. The ash generated by the thermal decomposition of waste is discharged from the rotary kiln through the second switching valve to the plurality of cooling collection hoppers sequentially and continuously, so that the internal temperature of the rotary kiln is reduced by the heater. Combined with the highest temperature in the central part, the waste is rolled down while receiving appropriate high-temperature treatment in a slender cylindrical inclined rotary kiln, and is subjected to thermal decomposition treatment continuously and efficiently. Become so. The gas generated by subjecting the waste to thermal decomposition in the rotary kiln in this way is suctioned and discharged by the exhaust blower through a filter. On the other hand, the ash generated by the thermal decomposition treatment of the waste is cooled by a cooling type collection hopper and discharged. (3) If the waste treatment equipment is mounted on a vehicle mounted on a trailer towed by a tractor, the time when the contaminant adsorbent is sufficiently stored on site will be determined. Since the equipment can be transferred to the site and the waste disposal operation can be performed while the equipment is mounted on the trailer, there is an advantage that the operation efficiency of the equipment is improved. (4) The conveying means for sending the contaminated adsorbent discharged from the mixing tank to the waste treatment apparatus is provided with a conveyor for receiving the contaminated adsorbent from the lower opening of the mixing tank and conveying the contaminated adsorbent in a horizontal direction. If a heater as a drying means is provided on the surrounding wall of the conveyor, the contaminated adsorbent will be efficiently dried in the process of being conveyed to the waste treatment apparatus, and the steam generated by the drying will be exhausted by the exhaust fan. Since the contaminated adsorbent is forcibly sucked and discharged, drying of the contaminated adsorbent is performed more efficiently, and the safety against steam explosion during the heat treatment of the contaminated adsorbent in the waste disposal device is sufficiently improved. . (5) At the end of the conveyor, the contaminant adsorbent discharged from the conveyor is lifted upward by the bucket conveyor in the surrounding wall, and is further carried into the waste disposal device through a sealed chute. In this case, the contamination adsorbent is not scattered to the outside as dust, and air pollution can be sufficiently prevented.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a contaminated soil discharge water treatment apparatus as one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waste supply hopper 1a Hermetic opening / closing lid 2 Nitrogen gas generator 3 Rotary kiln 4,5 Fixed receiving part 6 Hermetic bearing part 7 Motor 8 Gear 9 Heater 10 First switching valve 10a Second switching valve 11 Push-in feeder ( Screw feeder) 12 Water-cooled gas-cooled trap 13 Filter 14 Exhaust blower 15 Off-gas treatment system 16 Chimney 17 Cooling collection hopper 18 Power supply input terminal 21 Anode 22 Cathode 23 AC / DC converter 24 Piping 25 Vacuum pump 25a Motor 26 Piping 27 Valve 28 Hopper 29 Mixing tank 30 Adsorbent 31 Drain pump 31a Motor 32 Screw conveyor 32a Motor 33 Enclosure wall 34 Rotary drive unit 35 Bucket conveyor 36 Chute 37 Piping 38 Chelate water introduction unit 39 Exhaust fan 39a Duct 40 Contaminated soil

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F27B 7/06 F27B 7/33 7/32 7/34 7/33 7/42 7/34 F27D 3/08 7/42 7/06 Z F27D 3/08 B09B 3/00 304K 7/06 F term (reference) 4D004 AA41 AA47 AB03 AC07 AC10 CA24 CA34 CA44 CA50 CB09 CB32 CB34 CB42 CB43 CB45 CC06 DA02 DA20 4D024 AA09 AB16 BA02 BB01 BC04 DA01 DA01 4K055 DA05 4K061 AA08 BA03 DA05 EA00 FA06 FA11 GA02 GA04 4K063 AA18 BA11 CA02 DA15 DA24 DA32

Claims (5)

[Claims] 1. A vacuum pump installed in the vicinity of a cathode for sucking and discharging contaminated water from a water-permeable pipe-shaped cathode of an electrode pair inserted into contaminated soil, and a mixer connected to an outlet of the vacuum pump. A tank, an adsorbent receiving hopper provided above the mixing tank to supply the particulate adsorbent to the mixing tank, and treated water purified by adsorbing contaminants by the adsorbent in the mixing tank. A drain pump for sucking and discharging, and a means for drying the contaminated adsorbent generated by the adsorbent adsorbing the contaminant in the mixing tank, and a conveyer for transferring the contaminated adsorbent after drying to a waste treatment apparatus as waste. A contaminated soil discharge water treatment device, comprising a transport means. 2. The contaminated soil discharge water treatment apparatus according to claim 1, wherein the waste treatment apparatus includes a plurality of waste supply hoppers connected to the conveyance unit, and supplies waste from the hopper. Receiving pusher, a slender rotary kiln for thermally decomposing waste pushed by the feeder, rotating means of the rotary kiln, a heater surrounding and heating the outer periphery of the rotary kiln, and a waste heater in the rotary kiln. An exhaust blower that sucks and exhausts gas generated by the pyrolysis process from the rotary kiln through a filter to make the inside of the rotary kiln a reduced pressure state with less oxygen content, and collects ash generated by the pyrolysis process from the rotary kiln. With a plurality of cooling collection hoppers to cool and discharge,
A first switching valve for sequentially and continuously supplying waste from the plurality of waste supply hoppers to the push-in feeder is provided, and the rotary kiln sequentially and continuously supplies the plurality of cooled collection hoppers. A second switching valve for delivering ash is provided, and the heating function of the heater causes the temperature distribution inside the rotary kiln to be the highest in the center of the rotary kiln and to be lower at both ends of the rotary kiln. A contaminated soil discharge water treatment device, characterized in that: 3. The contaminated soil discharge water treatment device according to claim 2, wherein the waste treatment device is mounted on a trailer towed by a tractor. . 4. The contaminated soil discharge water treatment apparatus according to claim 1, wherein the conveying means receives the contaminated adsorbent from a lower opening and closing port of the mixing tank and conveys the contaminated adsorbent in a horizontal direction. The drying means is configured as a heater mounted on the surrounding wall of the conveyor, and an exhaust fan is provided to suck and discharge water vapor generated from the contaminated adsorbent heated by the heater. A contaminated soil discharge water treatment device, characterized in that: 5. The contaminated soil effluent treatment apparatus according to claim 4, wherein the bucket adsorber discharges the contaminated adsorbent discharged from the conveyer at the end of the conveyer upward, and the bucket conveyer has an enclosed wall. A contaminated chute having a closed structure for receiving the contaminant adsorbent from an upper end discharge portion and carrying the contaminated adsorbent into the waste treatment device;