JP6284156B2 - Pollutant separation and volume reduction system and method - Google Patents

Description

  The present invention relates to a pollutant separation and volume reduction system and method that separates pollutants by washing soil or water contaminated with chemical substances and radioactive substances.

  For example, as disclosed in Patent Document 1, a pressurized levitation device for purifying contaminated water contaminated with a chemical substance or a radioactive substance has been proposed.

  This pressurized flotation device is used for raw water containing substances suspended in water as it is or after coagulation treatment, ph adjustment treatment, chemical reaction treatment, suspended substances, aggregated and separated substances, and ph adjustment treatment. The substance deposited as a result, the substance deposited as a result of chemical reaction treatment, is made into a device that reduces the apparent specific gravity by reducing the apparent specific gravity, and for example, is a device that performs gas-liquid separation. When released under atmospheric pressure, the generated fine bubbles adhere to suspended matter in the water and rise to the liquid surface together with suspended matter. The water remaining after the floating substance is recovered by a skimmer or the like becomes treated water.

  Usually, the floating substance is made into a floating scum by a flocculant, and this floating scum is collected by a skimmer or the like. However, when the collected amount becomes large, it is difficult to secure a storage place. Arise.

Contaminants such as soil contamination usually contaminate the soil over a wide area over a long period of time, but are difficult to biodegrade with soil microorganisms, so-called persistent materials, organic materials containing heavy metals, organophosphorus compounds, dioxins and other chlorine-containing substances the organics are toxic, and many organic solvents organic matter, it was sometimes difficult to configure the system by abatement apparatus simple on site.

JP 2010-162518 A

  The present invention has been made in view of the above-mentioned conventional problems, and after recovering the floating scum containing the pollutant in the pressurized flotation device, it is decomposed to separate the pollutant at a high concentration and reduce the volume. It is an object of the present invention to provide a pollutant separation and volume reduction system.

  As a result of diligent research, the present inventor has recovered the pollutant from the contaminated soil contaminated with contaminated water and pollutant by the floating scum, and further separated the pollutant at a high concentration from the floating scum. And completed the method.

  That is, the above-described problems can be solved by the following embodiments.

(1) A pressurized water mixing apparatus that mixes pressurized water containing ultrafine bubbles having a diameter of 100 nm or less with contaminated water containing contaminants, and a pressurized floating tank equipped with an inlet of contaminated water mixed with the pressurized water at one end. Mixed with the pressurized water containing the ultrafine bubbles in the contaminated water, injected from the inlet into the pressurized levitation tank, and suspended matter or dissolved components in the contaminated water in the pressurized levitation tank the floated by adsorbing interface ultrafine bubbles, dehydrated with removed as floating scum from contaminated water, and the remaining liquid on the discharge to floatation as treated water apparatus, the floating scum fetched in the upper floatation device And the dewatered floating scum and the dehydrated filtrate to be separated into the dehydrated filtrate, and the pressurized water production to supply the pressurized water as the pressurized water by mixing the ultrafine bubbles with the treated water in the pressurized floating device apparatus , High temperature pressure vessel, by injecting high-pressure steam, as a processing object of the dewatering floating scum inserted from inlet, nitrous and critical water treatment apparatus for decomposing a subcritical state the processing object, the In the subcritical water treatment device, the solid matter separation device that has been treated with the subcritical water and separates the solid matter from the discharged processing target, and the sludge after the solid matter is separated by the solid matter separation device is treated. A biological treatment device, a surplus sludge dewatering device that dehydrates surplus sludge from the biological treatment device, and sends the dewatered sludge to an inlet of the subcritical water treatment device, a dehydrated filtrate generated in the floated material dewatering device, A pollutant separation and volume reduction system comprising: a treatment liquid in a biological treatment apparatus; and a water circulation system that circulates the dehydrated filtrate generated in the excess sludge dewatering apparatus as the contaminated water.

The levitation scum separated and levitated from the contaminated water by ultrafine bubbles in the pressurized flotation device is dehydrated and then subcritical water treated by high-temperature and high-pressure steam in the subcritical water treatment device, resulting in high-concentration organic contamination. The substance is decomposed and converted into a low-molecular harmless substance, and the organic metal content as a harmful substance is due to the hydrophobic effect due to the organic substance reduced in molecular weight and the original moisture content, moisture condensed by water vapor, Since it is changed to a condensate that can be easily separated, it can be easily separated by a solids separator. Moreover, solid content, such as a metal solid content and a stone, can also be isolate | separated with a solid substance separator. In other words, subcritical processing products discharged to the outside are adjusted to operate in a slurry state in this processing, but solids are separated by a solids separator, and other low-molecular-weight organic matter parts are highly concentrated activated sludge. Biological treatment is performed by a treatment device or the like.

  In addition, the system for separating pollutants from contaminated soil containing pollutants first cleans the contaminated soil and separates it into supernatant water consisting of a suspension containing pollutants and silt and settled washed soil. A contaminated soil cleaning system, wherein the water circulation system is configured to send the supernatant water in the contaminated soil cleaning system as contaminated water to the pressurized flotation device through or without passing through the agglomeration reaction device, Contaminant characterized in that a part of the pressurized water produced and part of the treated water in the pressurized levitation device is supplied to the contaminated soil cleaning system as contaminated soil cleaning water. The above problem is solved by a separation and volume reduction system.

  Here, the contaminated soil is once washed with washing water containing pressurized water, separated into suspended water containing contaminants and washed soil, and the suspended water is sent to a pressurized flotation device for processing.

According to the present invention, the floating scum after treating the contaminated water containing the pollutant or the suspended water after washing the contaminated soil containing the pollutant with the pressurized flotation device is dehydrated. Therefore, in the subcritical water treatment equipment, harmful organic substances can be decomposed into harmless low molecular weight organic substances by subcritical water treatment, and if there are residual heavy metal contaminants, they can be concentrated and extracted. Have In addition, low-molecular-weight organic matter is decomposed at high speed by biological treatment such as high-concentration activated sludge treatment and high-concentration membrane treatment activated sludge treatment, and the organic matter is biologically oxidized, and most of it is decomposed into carbon dioxide and reduced in volume Has an effect.

  In the system of the present invention, organic substances are reduced in molecular weight and biodegradation is facilitated, and dioxins and the like are decomposed and detoxified by organic chlorine bonds by subcritical water treatment to become low molecular organic substances, carbon dioxide gas, hydrogen chloride, etc. Hydrogen chloride changes to salinity by biological treatment. In addition, the organic phosphorus compound is also made harmless by changing to a lower molecular organic compound, carbon dioxide gas, and inorganic phosphate. Hazardous heavy metals condense and separate solids.

  The system of the present invention effectively and efficiently treats pollutants even with contamination of toxic organic substances such as solvents over a wide area, toxic heavy metals, dioxins and organophosphorus compounds. Can be separated, decomposed and reduced in volume.

The block diagram which shows typically the contaminant separation volume reduction system concerning the Example of this invention The block diagram which shows typically the coagulation reaction apparatus, the pressure levitation apparatus, and the pressurized water manufacturing apparatus in the Example The front view made into the partial cross section which shows the pressurization floating apparatus in the Example Block diagram schematically showing the flocculant reaction device in the pressurized flotation device The front view which shows the pressurized water manufacturing apparatus in the Example The front view made into the partial cross section which shows the bubble containing water separation apparatus which comprises a part of pressurized water manufacturing apparatus concerning the Example Block diagram showing a subcritical water treatment apparatus in the same embodiment Front view showing details of the same subcritical water treatment system Side view Plan view Circuit diagram showing control system of subcritical water treatment equipment

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, a contaminant separation and volume reduction system 10 according to an embodiment of the present invention includes an agglomeration reaction device 12, a pressurized water mixing device 14, a pressurized flotation device 20, and a levitated material dewatering device 26. The subcritical water treatment device 30, the water ejector device 50, the solid matter separation device 60, the activated sludge treatment device 62, the excess sludge dewatering device 64, the pressurized water production device 70, the water circulation system 80, and the contaminated soil washing And a system 90.

  The agglomeration reaction apparatus 12 is configured to mix a flocculant with contaminated water containing a contaminant (details will be described later).

  The pressurized water mixing device 14 is configured to mix pressurized water containing ultrafine bubbles having a diameter of 100 nm or less into the contaminated water to which the flocculant is added in the aggregation reaction device 12.

The pressurized levitation device 20 includes a pressurized levitation tank 22 provided with one end (left end in FIGS. 2 and 3) of the contaminated water inlet 21A mixed with the pressurized water, and the contaminated water mixed with the pressurized water is It is injected into the pressurized levitation tank 22 from the inlet 21A, and floated in the pressurized levitation tank 22 by adsorbing the interface of ultrafine bubbles to suspended matter or dissolved components in the contaminated water, and agglomerating this. Superfine bubbles are attached to the flocculant that is entangled with the agent and entangled with suspended matter and dissolved components, and then floats up and floats out from the contaminated water as floating scum , and the remaining liquid is discharged as treated water. Have been to.

The floating dewatering device 26 dewaters the floating scum taken out by the pressure floating device 20 and separates it into a dehydrated floating material and a dehydrated filtrate.

  The pressurized water manufacturing apparatus 70 is configured to mix ultrafine bubbles with the treated water in the pressurized levitation apparatus 20 and supply the pressurized water to the pressurized water mixing apparatus 14 as pressurized water.

  The subcritical water treatment device 30 injects high-temperature and high-pressure steam into the pressure vessel 32, and decomposes the treatment target charged through the inlet 42A as a subcritical state.

  The solid matter separation device 60 is configured to separate solid matter made of metal or foreign matter and sludge containing powder from the processing object discharged after the subcritical water treatment in the subcritical water treatment device 30. Thus, the activated sludge treatment device 62 is configured to treat the sludge containing the powder after the solid matter is separated in the solid matter separation device 60.

  This activated sludge treatment device 62 is composed of an upper high concentration activated sludge treatment device 62A and a subsequent high concentration membrane treatment activated sludge treatment device 62B.

  The excess sludge dewatering device 64 is configured to dehydrate excess sludge from the high-concentration membrane treatment activated sludge treatment device 62B and send the dehydrated sludge to the inlet 42A of the subcritical water treatment device 30 (details will be described later).

  In the water circulation system 80, the dewatered filtrate generated in the levitated product dewatering device 26 is passed through the first circulation pipe 81A, and the treatment liquid from the high-concentration membrane treatment activated sludge treatment device 62B is passed through the second circulation pipe 81B, and the excess sludge dewatering device 64. The dehydrated filtrate generated in step 1 is collected by the third circulation pipe 81C and circulated as contaminated water in the agglomeration reactor 12.

  The contaminated soil cleaning system 90 includes a first cleaning basin 91 and a second cleaning basin 92, first and second submersible agitators 93A and 93B disposed in the respective cleaning basins, and a first cleaning basin 91 and a second cleaning basin. For carrying 92 contaminated soil, transferring the washed soil from the first wash basin 91 to the second wash basin 92, and for taking in and carrying out the contaminated soil for taking out the soil that has been washed from the second wash basin 92. And a heavy machine 94.

  In the contaminated soil washing system 90, the pressurized water produced in the pressurized water production apparatus 70 is supplied to the first and second washing basins 91 and 92, the contaminated water containing the pollutants generated in the first washing basin 91, and the contaminated silt. Are supplied to the agglomeration reactor 12 as contaminated water by a pump 95.

  The cleaning water in the contaminated soil cleaning system 90 is configured to flow from the second cleaning basin 92 to the first cleaning basin 91 via the overflow discharge pipe 96. It should be noted that a shortage of cleaning water is supplied from the pressurized water manufacturing apparatus 70 to the first cleaning pond 91.

  On the other hand, the contaminated soil is thrown into the first washing basin 91 by the dump truck 94A, and the contaminated soil after washing is scooped out from the first washing pond 91 by the yumbo 94B and put into the second washing basin 92. Yes.

  Also, the earth and sand rinsed and washed in the second washing pond 92 is scraped out by the yumbo 94B, placed in a drainage site, and carried out by the dump truck 94C after draining by natural gravity dehydration.

  Next, the pressurized levitation device 20 and the pressurized water production device 70 will be described with reference to FIGS.

  The pressure levitation device 20 includes a circulation device 23 that circulates mixed water of raw water (for example, radioactive material or chemical substance contaminated water) and ultrafine bubbles in the pressure levitation tank 22, and the pressure levitation tank 22. And the separated product taking-out device 24 for taking out the floating scum floated on the liquid surface in the water containing ultrafine bubbles.

  The circulation device 23 includes a swirl discharge pipe 23A and a swirl flow forming guide 23B. The swivel discharge pipe 23A is provided to project from an end portion (left end portion in the figure) in the pressurized levitation tank 22, and as shown in an enlarged view in FIG. 3, the tip is bent obliquely upward, and the tip opening is The inlet 21A has a curved pipe shape that ejects a mixed liquid of raw water and ultrafine bubble-containing liquid obliquely upward, and is further ejected as a swirling flow into the pressurized levitation tank 22 by a fixed fin or the like. It is configured.

  The swirl flow forming guide 23B is a cylindrical body that surrounds the swirl discharge pipe 23A and guides the swirl flow discharged from the swirl discharge pipe obliquely upward. It arrange | positions so that the swirling flow jetted may be guided diagonally forward.

  Further, the pressurized levitation device 20 has the separated material extraction device 24 for taking out the floating scum that has floated on the liquid surface in the pressure levitation tank 22, and the remaining liquid from which the levitation scum has been taken out is treated liquid. The gas is discharged from the discharge port 21B. The discharge port 21 </ b> B is connected to the pressurizing pump 76 via the inflow pipe 73 in the pressurized water manufacturing apparatus 70.

  Ultrafine bubbles are added to the treated water from the pressurized levitation device 20 by the pressurized water production device 70, and water containing large bubbles and water containing ultrafine bubbles are added by the bubble-containing water separator 76. The ultrafine-bubble-containing water is pressurized and passed through the pressurized water pipe 75, and is added to the flocculant-added raw water discharged from the flocculant reaction device 12, and then the pressurized floating tank from the inlet 21A. 22 flows as a swirl flow (details will be described later).

  In addition, a gap 23C is formed between the swirling flow forming guide 23B and the bottom surface of the pressurized levitation tank 22, and a flow as indicated by symbol F is generated. The water in the pressure levitation tank 22 can flow in. When the pressurized flotation device 20 is operated for a predetermined time or more, a precipitate separation is precipitated on the bottom surface of the pressure flotation tank 22, and this precipitate separation is also swirled by being sucked into the swirl flow forming guide 23B from the gap 23C. It circulates in the pressurized levitation tank 22 along with the swirling flow from the discharge pipe 23A.

  As shown in FIG. 3, at the end of the pressurized floating tank 22 opposite to the circulation device 23, a plurality (four in this case) of suction pipes 27 for collecting the water in the pressurized floating tank 22 and this One horizontal collecting pipe 28 connected to the discharge side of the suction pipe 27 and the water collected perpendicularly to the collecting pipe 28 outside the side wall of the pressurized levitation tank 22 and collected through the collecting pipe 28. Ascending pipe 29, a sub tank 110 surrounding the upper end of the rising pipe 29 and formed on the outer surface of the pressurized levitation tank 22, and a suction port 111A at the upper end provided in the sub tank 110. Is provided with a discharge adjustment device 112 including a level adjustment pipe 111 having a lower end that is freely movable within a certain range and having a lower end serving as a discharge port 21B.

  The separated product take-out device 24 includes an endless chain 24A and a plurality of skimmers 24B attached to the endless chain 24A at regular intervals, and the floating scum in which the skimmer 24B floats on the liquid surface in the pressurized levitation tank 22 is shown in FIG. In FIG. 3, the gas is swept from the left side to the right side and collected to the outside position of the pressurized levitation tank 22.

  In addition, the separated product taking-out device 24 includes a feed screw 24C for sending the floating scum collected by the skimmer 24B to the side and discharging it.

  Next, the flocculant reactor 12 will be described with reference to FIG.

  The flocculant reaction apparatus 12 includes a radioactive substance adsorbent automatic dissolution apparatus 12A, an organic flocculant automatic dissolution apparatus 12B, and a flocculant reaction tank 12D to which the flocculant dissolved by the inorganic flocculant automatic dissolution apparatus 12C is supplied. The flocculant is dissolved and mixed with the raw water. The code | symbol 12E of FIG. 1 shows the stirring apparatus for mixing a flocculant and raw | natural water well.

  The flocculant reaction device 12 further includes a ph adjusting agent automatic dissolution device 12F and a chemical reaction chemical automatic dissolution device 12G. The ph modifier is for depositing heavy metals, and the chemical reaction chemical is for colloidal deposition of organic substances.

  As the flocculant, sulfate band, polyaluminum chloride, ferrous sulfate, ferric sulfate, ferric chloride, polyiron, calcium chloride, mineral inorganic flocculants as inorganic flocculants, anionic high as polymer flocculants Molecular flocculants, cationic polymer flocculants, nonionic polymer flocculants, ph regulators as caustic soda, sodium carbonate, lime, sulfuric acid, hydrochloric acid, phosphoric acid, chemical reactants depending on the object that caused the contamination Although adjusted, precipitation promoters for increasing hydrophobicity such as powdered activated carbon, powdered zeolite, diatomaceous earth, activated clay, sodium sulfide for sulfidation, sulfite and calcium salts are used. Shielding agents and surfactants for easy handling are also used as chemical reactants.

  The water containing large bubbles from the bubble-containing liquid separation device 72 shown in FIG. 2 is sent to the outlet side of the flocculant reaction tank 12D via the pipe 80A, where the raw water mixed with the flocculant is mixed. It is supposed to be mixed.

  In the pressurized flotation device 20 according to this embodiment, after the ultrafine bubble-containing liquid is injected into the raw water (for example, radioactively contaminated water) in which the flocculant is dissolved and added, the spiral flow becomes a swirl flow The formation guide 23B forms an upward spiral flow from the left end to the right side in FIGS.

  On the other hand, a gap 23C is formed between the lower end of the swirl flow forming guide 23B and the bottom of the pressurized levitation tank 22, from which the liquid in the pressurized levitation tank 22 is entrained by the swirl flow, A large circulating flow is formed in the pressurized levitation tank 22.

  In this circulating flow, the flocculant can take in trace amounts of particles such as cesium that happen to come into contact, but in the absence of ultrafine bubbles, it can hardly take up.

  In other words, the ultrafine bubbles vibrate vigorously, and in the process of adhering to the cesium ions and floating them, the chance of contacting the adhering cesium ions and the like to the flocculant can be greatly increased. In this case, the levitated separation levitated by the ultrafine bubbles is taken up by the 100% flocculant and levitated on the liquid surface as levitating scum.

  The levitation scum is collected at the right end in FIG. 3 by a skimmer 24B driven by an endless chain 24A in the separator take-out device 24, and further collected laterally by a feed screw 24C and discharged to the outside.

  The discharged floating scum is dewatered and solidified by the floating material dewatering device 26 and stored in a container. The liquid generated by the dehydration is returned to the pressurized floating tank 22 by the water circulation system 80.

  As shown in FIGS. 2 and 5, the pressurized water production apparatus 70 has an ejector 71 provided with an ejector 71 that forms ultrafine bubbles, as shown in FIGS. 2 and 5. The tube 73 is connected by screwing. Further, the discharge pipe 74 is connected to the discharge side by screwing in the same manner as the inflow pipe 73. Further, the gas introduction pipe 75 is connected by screwing. A gas introduction amount control valve 76 is provided in the middle of the gas introduction pipe 75.

  The pressurized water supply system 72 is connected to the inflow pipe 73 and the discharge pipe 74, the pressurized pump 76 capable of supplying pressurized water containing fine bubbles to the inflow pipe 73, and the suction side of the pressurized pump 76, and gas is mixed. A raw water supply pipe 77 that supplies water to be supplied and a pressure feed pipe 78 that is connected to the discharge side of the pressure pump 76 and feeds the pressurized water are provided.

  An inflow pipe 73 is connected in the middle of the pressure feed pipe 78, a discharge pipe 74 is connected to the raw water supply pipe 77, and a part of the ultrafine bubble-containing water formed by the ejector 71 is supplied to the discharge pipe 54 and the raw water supply. It is configured to recirculate through a pipe 77, a pressure pump 76, a pressure feed pipe 78, and an inflow pipe 73. 4 indicates a motor for driving the pressurizing pump 76.

  A pressure feed pipe 78 of the pressurized water supply system 72 is connected to the bubble-containing water separation device 76 shown in FIG. 6 and supplies ultrafine bubble-containing water in a pressurized state.

  The bubble-containing water separation device 76 is composed of a storage-type pressurized water tank having a circular cross section, and is provided on the upper side surface of the tank, and a pressurized water inflow port 76A into which ultrafine bubble-containing water pumped through the pressure feed pipe 78 flows, and a tank lower portion. A pressurized water discharge port 76B provided on the side surface, a central water discharge port 76C provided at the upper end of the tank, and a pressurized water inflow port 76A provided inside the pressurized water inflowing downward swirling flow along the circumferential surface in the tank And a swirl flow forming pipe 76D.

  The swirling flow forming pipe 76D is configured to cause the pressurized ultrafine bubble-containing water flowing in the radial direction in the circular tank cross section from the pressurized water inflow port 61 counterclockwise along the inner peripheral surface of the circular cross section tank. And it is comprised so that a pressurized liquid may be guide | induced so that it may become a slightly diagonally downward spiral flow.

  The liquid flowing in from the pressurized water inflow port 76A is discharged out of the tank from the pressurized water discharge port 76B and the central water discharge port 76C provided on the lower side surface of the tank, and the respective discharge amounts are in the vicinity of the central water discharge port 76C. It is controlled by the provided discharge amount control valve 76E.

  The pressurized water filled in the tank is swirled by the swirl flow forming pipe 76D, but the center water discharge port 76C is provided at the center position of the upper end surface of the tank. A portion of the water is discharged from the central water discharge port 76C, and the water in the outer portion of the swirl flow is discharged from the pressurized liquid discharge port 76E.

  Since the water in the tank is swirled, the part with a relatively large specific gravity including ultrafine bubbles is outside the swirl, and the water containing the bubbles larger than this has a relatively small specific gravity and collects in the central part of the swirling flow. The portion of the liquid flowing into the tank containing relatively large bubbles is discharged from the central water discharge port 76C, and the remaining water is discharged from the pressurized water discharge port 76B in a state containing more ultrafine bubbles. .

  Next, the subcritical water treatment apparatus 30 will be described in detail.

  As shown in FIG. 7, the subcritical water treatment device 30 injects high-temperature and high-pressure steam into the pressure vessel 32 and decomposes the dewatered floating scum in the pressure vessel 32 as a processing object. Is.

  As shown in FIGS. 7 to 9 and FIG. 11, the subcritical water treatment device 30 includes a pressure vessel 32, a steam supply device 34, a stirring device 36, a steam control device 38, and a rotary shaft control device 40. It is configured with.

  The pressure vessel 32 is provided with an inlet 42A for introducing the treatment object, an outlet 42B for discharging the treatment object after the subcritical water treatment, and high-temperature and high-pressure steam is injected into the pressure vessel 32. The water vapor inlet 42C (two places) is provided.

  The input port 42A is formed to protrude in a cylindrical shape at the upper part of the pressure vessel 32, and is opened and closed by a clutch door 43A at the upper end.

  Reference numeral 44 in FIGS. 7 and 8 denotes a steam pipe, which is formed in a cylindrical shape standing upward from the upper end of the pressure vessel 32 and discharges dust and excess steam to the outside. ing. There is also a steam outlet 32E at the upper end of the cylindrical body.

  The outlet 42B is attached to the right end of the pressure vessel 32 so as to be inclined downward in FIG. 8, and is opened by a handle 32F so that the processing object after the subcritical water treatment can be discharged to the outside. . At this time, the rotation shaft 36A of the stirring device 36 is rotated so as to push the processing object inside in the direction of the outlet 42B.

  The steam supply device 34 supplies the high-temperature and high-pressure steam produced by the boiler 34A into the pressure vessel 32 from the steam inlet 42C via the pressure adjustment valve 34B and the steam on-off valve 38D (described later). Has been.

  The stirrer 36 includes a rotary shaft 36A disposed substantially horizontally through the center of the pressure vessel 32, and a plurality of the rotary shafts 36A that extend in the radial direction at a plurality of locations in the longitudinal direction. And a stirring blade 36B. The rotary shaft 36A is driven from a motor 37A provided on the lower left side in FIG. 8 via a speed reducer 37B, and a processing object in the pressure vessel 32 is stirred.

  Here, during normal operation, the rotation shaft 36A is rotated in a clockwise direction or a counterclockwise direction at regular intervals, and the stirring blade 36B removes the object to be processed from the outlet 42B side toward the motor 37A. It is sent in the opposite direction.

  As shown in FIG. 11, the water vapor control device 38 includes temperature sensors 38A and 38B attached to two locations outside the pressure vessel 32, and similarly, pressure sensors 39A and 38A attached to the upper outside of the pressure vessel 32. 39B, a steam on-off valve 38D for adjusting the amount of steam supplied to the steam inlet 42C, a steam discharge valve 37 for discharging steam in the pressure vessel 32, and a control device main body 38C. ing.

  The temperature sensors 38A and 38B are configured to detect the temperature inside the pressure vessel 32, and the pressure sensors 39A and 39B are configured to detect the pressure inside the pressure vessel 32.

  Detection output signals from the temperature sensors 38A and 38B and the pressure sensors 39A and 39B are output to the control device main body 38C.

  The control device main body 38C is composed of a CPU, and drives the steam on-off valve 38D via the on-off valve driving device 38E based on the detected temperature signal and the detected pressure signal from the temperature sensors 38A and 38B and the pressure sensors 39A and 39B. The amount of steam supplied into the pressure vessel 32 can be adjusted.

Rotation shaft controller 40, mounted on the rotation shaft 36A, and the rotational speed sensor 50A which detects the rotational speed, based on the sensor output signal from the torque sensor 50B for detecting the rotational torque of the rotation shaft 36A The rotation speed is controlled.

Specifically, the rotation shaft control device 40 has a constant product of the rotation speed of the rotation shaft 36A based on the output signal from the rotation speed sensor 50A and the rotation torque of the rotation shaft 36A based on the output signal from the rotation torque sensor 50B. The rotation speed of the rotary shaft 36A is controlled via the speed reducer 37B so as to be a value.

  In the subcritical water treatment apparatus 30, the object to be treated is brought into a subcritical state by high-temperature and high-pressure steam, so that biodegradation by soil microorganisms is difficult, so-called hardly degradable substances, heavy metal-containing organic substances, organophosphorus compounds, dioxins, etc. Organic substances such as chlorine-containing poisons, organic solvent organic substances, etc. are easily decomposed, heavy metals are condensed and solidified in a granular form, taken out as a slurry together with other decomposition products, and taken out from the outlet 42B. In 60, it is separated and carried out.

  The remainder is biologically processed in the activated sludge treatment device 62 and greatly reduced in volume.

  The water ejector device 50 is provided between the exhaust pipe 44 of the subcritical water treatment device 30 and the high-concentration activated sludge treatment device 62, and removes dust by passing the exhaust gas from the exhaust pipe 44 through the wash water. Dust-containing water including dust is supplied to the high-concentration activated sludge treatment device 62 as a treatment object.

  The water ejector device 50 includes a water ejector 52A that exposes exhaust gas from the exhaust pipe 44 to cleaning water, a circulating water tank 52B into which exhaust gas and cleaning water flows from the water ejector 52A, and an upper end of the circulating water tank 52B. It has a water ejector exhaust pipe 52C that exhausts exhaust gas after being exposed to the cleaning water, and a dust removal device 52D that removes dust from the water ejector exhaust pipe 52C.

  Moreover, the wash water in the circulating water tank 52B is pumped up by the circulation pump 52E, and is supplied to the water ejector 52A as the wash water.

  The dust separated by the dust removing device 52D is sent from the floating material dewatering device 26 to the input material feed system that reaches the input port 42A of the subcritical water treatment device 30, and is input to the input port 42A. .

  In addition, you may comprise so that the dust containing water from the water ejector apparatus 50 may be sent to the 2nd circulation pipe 81B which is a treated water pipe of the high concentration activated sludge processing apparatus 62. FIG.

  In the present invention, the contaminated water may be sent directly to the pressurized flotation device 20 via the pressurized water mixing device 14 without using the flocculant reaction device 12. It is also applied when not using.

  Further, the exhaust gas from the exhaust pipe 44 may be sent to the dust removing device 52D without using the water ejector device 50. Further, the activated sludge treatment device 62 may be any device that can reduce the volume of slurry by biological treatment.

  It can be used in industries that condense and decompose pollutants from water and soil containing pollutants such as chemical substances and radioactive substances, and significantly reduce the volume of contaminated water and soil.

DESCRIPTION OF SYMBOLS 10 ... Pollutant separation volume reduction system 12 ... Coagulant reaction apparatus 14 ... Pressurized water mixing apparatus 20 ... Pressurized flotation apparatus 21A ... Inlet 21B ... Discharge port 22 ... Pressurized flotation tank 23 ... Circulation apparatus 23A ... Swirling discharge pipe 23B ... Swirl flow forming guide 23C ... Gap 24 ... Separate product takeout device 24A ... Endless chain 24B ... Skimer 24C ... Feed screw 26 ... Floating matter dewatering device 27 ... Suction pipe 28 ... Collecting pipe 29 ... Rising pipe 30 ... Subcritical water treatment equipment 32 ... Pressure vessel 34 ... Steam supply device 36 ... Stirring device 38 ... Steam control device 38A, 38B ... Temperature sensor 38C ... Control device body 38D ... Steam on-off valve 38E ... On-off valve drive device 39A, 39B ... Pressure sensor 40 ... Rotating shaft Control device 41 ... steam supply port 42A ... inlet port 42B ... outlet 42C ... steam inlet port 44 ... Exhaust pipe 50 ... Water ejector device 52A ... Water ejector 52B ... Circulating water tank 52C ... Water ejector exhaust pipe 52D ... Dust removal device 52E ... Circulating pump 60 ... Solid matter separation device 62 ... Activated sludge treatment device 62A ... High concentration activated sludge treatment Device 62B ... High-concentration membrane treatment activated sludge treatment device 64 ... Excess sludge dewatering device 70 ... Pressurized water production device 71 ... Ejector 72 ... Pressurized water supply system 73 ... Inflow pipe 74 ... Pressure pump 75 ... Pressurized water tube 76 ... Bubble-containing water separator DESCRIPTION OF SYMBOLS 80 ... Water circulation system 90 ... Contaminated soil washing | cleaning system 91 ... 1st washing pond 92 ... 2nd washing pond 93A ... 1st submersible agitator 93B ... 2nd underwater agitator 94 ... Contaminated soil carrying in and carrying out heavy equipment 94A, 94C ... Dump truck 94B ... Yumbo 95 ... overflow discharge pipe

Claims (11)

A pressurized water mixing device for mixing pressurized water containing ultrafine bubbles having a diameter of 100 nm or less with contaminated water containing contaminants;
It includes a pressurized levitation tank having an inlet of contaminated water mixed with the pressurized water at one end. The pressurized water containing the ultrafine bubbles is mixed into the contaminated water and injected into the pressurized levitation tank from the inlet. In the pressurized levitation tank, suspended surfaces in the contaminated water and dissolved components are adsorbed and floated on the interface of the ultrafine bubbles, taken out from the contaminated water as levitation scum , and the remaining liquid as treated water A pressurized flotation device for discharging;
A levitated dewatering device for dewatering the levitated scum taken out in the pressurized levitating device and separating it into a dehydrated levitating scum and a dehydrated filtrate;
A pressurized water production apparatus that mixes the ultrafine bubbles with the treated water in the pressurized levitation apparatus and supplies the pressurized water as the pressurized water to the pressurized water mixing apparatus;
Injecting high-temperature and high-pressure steam into the pressure vessel, using the dewatered levitated scum introduced from the inlet as a processing object, a subcritical water treatment apparatus for decomposing the processing object as a subcritical state,
In the subcritical water treatment device, a solid matter separation device that has been treated with subcritical water and separates the solid matter from the discharged treatment target;
A biological treatment device for treating sludge after the solid matter is separated by the solid matter separation device;
Surplus sludge dewatering device for dewatering surplus sludge from the biological treatment device and sending the dewatered sludge to the inlet of the subcritical water treatment device;
A water circulation system that circulates the dehydrated filtrate generated in the levitated dewatering device, the treatment liquid in the biological treatment device, and the dehydrated filtrate generated in the surplus sludge dewatering device as the contaminated water;
Contaminant separation and volume reduction system. In claim 1,
A pollutant separation and volume reduction characterized by providing an agglomeration reaction apparatus for mixing at least one of a flocculant, a neutralizing agent, and a chemical reactant with the contaminated water before mixing the pressurized water with the contaminated water. system. In claim 1 or 2,
The subcritical water treatment device is:
A steam supply device for supplying high-temperature, high-pressure steam into the pressure vessel;
In the pressure vessel, a plurality of stirring blades for stirring the object to be processed, and a stirring device including a rotating shaft for driving the stirring blades;
A water vapor control device that controls the water vapor supply device to control the amount of water vapor supplied to the pressure vessel;
Wherein provided in the pressure vessel, and the process inlet of the object, outlet for taking out the processing object processed, and the high temperature, water steam inlet for injecting high-pressure steam,
Having
The water vapor control device includes a temperature sensor that measures the temperature of one or more locations in the pressure vessel, a pressure sensor that measures the pressure of one or more locations in the pressure vessel, and a control to which these sensor output signals are input. An apparatus main body, and an on-off valve driving apparatus for driving a steam on-off valve for adjusting a water vapor supply amount by the water vapor supply apparatus based on a command signal from the control apparatus main body,
A pollutant separation and volume reduction system characterized by comprising: In any one of Claims 1 thru | or 3,
The subcritical water treatment apparatus has an exhaust pipe that discharges exhaust gas containing dust and water vapor, and the exhaust gas discharged from the exhaust pipe is supplied to the biological treatment apparatus. Volume reduction system. In claim 4,
Between the exhaust pipe and the biological treatment apparatus, exhaust gas from the exhaust pipe is passed through washing water to remove dust, and dust-containing water containing the removed dust is supplied to the biological treatment apparatus as an object to be treated. A pollutant separation and volume reduction system characterized by providing a water ejector device. In claim 4 ,
Between the exhaust pipe and the biological treatment apparatus, exhaust gas from the exhaust pipe is passed through cleaning water to remove dust, and dust-containing water containing the removed dust is used for the treated water from the biological treatment apparatus. A pollutant separation and volume reduction system, characterized in that a water ejector device configured to be sent to a pipe is provided . In claim 5 or 6,
The water ejector device exposes the exhaust gas from the exhaust pipe to the cleaning water, the circulating water tank into which the exhaust gas and the cleaning water from the water ejector flow, and the cleaning water from the upper end of the circulating water tank. A pollutant separation and volume reduction system comprising: a water ejector exhaust pipe for discharging exhaust gas after being discharged; and a dust removing device for removing dust from the exhaust of the water ejector exhaust pipe. In claim 7,
The dust separated by the dust removal device is sent from the floating material dewatering device to the input material feed system leading to the input port of the subcritical water treatment device, and is input to the input port. A feature of the pollutant separation volume reduction system In any one of Claims 1 thru | or 8.
The pressure levitation device includes:
A circulating device that circulates mixed water of contaminated water and pressurized water containing ultrafine bubbles in the pressurized levitation tank, and the ultrafine bubbles contained in the pressurized water float to the liquid surface in the pressurized levitation tank. And a separated substance take-out device for taking out the floated scum . In any one of Claims 1 thru | or 9,
Having a contaminated soil cleaning system that cleans contaminated soil containing contaminants and separates it into suspended water consisting of contaminated water containing cleaning materials and silt and settled washed soil;
The water circulation system is configured to send the contaminated water in the contaminated soil cleaning system to the pressurized water mixing device via or without going through the agglomeration reaction device,
A part of the pressurized water produced by the pressurized water producing apparatus and a part of the treated water in the pressurized levitation apparatus are supplied to the contaminated soil cleaning system as contaminated soil cleaning water. Contaminant separation and volume reduction system. Using the pollutant separation and volume reduction system according to any one of claims 1 to 10, taking out the floating scum from the contaminated water containing the pollutant and treating it with subcritical water to obtain a slurry containing condensed metal, A method for separating and reducing pollutants, wherein the metal is separated from the slurry, and the remainder is biologically treated to reduce the volume.

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