CN112222171B - Three-phase separation device, and thermal desorption treatment process and system for volatile contaminated soil - Google Patents
Three-phase separation device, and thermal desorption treatment process and system for volatile contaminated soil Download PDFInfo
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- CN112222171B CN112222171B CN202010974011.5A CN202010974011A CN112222171B CN 112222171 B CN112222171 B CN 112222171B CN 202010974011 A CN202010974011 A CN 202010974011A CN 112222171 B CN112222171 B CN 112222171B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Soil Sciences (AREA)
- General Chemical & Material Sciences (AREA)
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- Processing Of Solid Wastes (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The utility model discloses a three-phase separation device, a thermal desorption treatment process of volatile contaminated soil and a system thereof, wherein the three-phase separation device is divided into more than two separation cabins through the inside of a body, a water baffle is used for isolating adjacent separation cabins, so that sludge is separated by gravity gradually in the separation process, a mud bucket arranged at the bottom of the separation cabins is used for collecting and removing DNAPL and mud, an overflow device arranged at the upper part of a liquid level can collect separated LNAPL and discharge the LNAPL through an LNAPL outlet, and separated liquid is discharged through a sewage outlet to be treated in the next stage. In the thermal desorption treatment process and system for volatile contaminated soil, the volatile mixed gas is subjected to heat exchange and cooling by a thermal desorption means to form liquid, the liquid enters a three-phase separation device for separation, and then the separated sewage is further treated by a sewage treatment system until the sewage reaches the standard and is discharged.
Description
Technical Field
The utility model relates to a thermal desorption treatment process for volatile chlorine-free organic contaminated soil/mercury-contaminated soil/oil sludge, belonging to the field of contaminated soil remediation.
Background
With the acceleration of the urbanization process, many polluted enterprises originally located in urban areas migrate out from urban centers, and meanwhile, with the relocation, production halt and closing of industrial enterprises, a large number of various and complex polluted sites are left.
The main pollutants in the polluted site in China comprise heavy metals (such as chromium, cadmium, mercury, arsenic, lead, copper, zinc, nickel and the like), pesticides (such as dichlorodiphenyl, hexachloro cyclohexane, dicofol and the like), petroleum hydrocarbon, persistent organic pollutants (such as polychlorinated biphenyl, mirex, polycyclic aromatic hydrocarbon and the like), volatile or solvent organic pollutants (such as trichloroethylene, dichloroethane, carbon tetrachloride, benzene series and the like), semi-volatile organic pollutants, organic-metal pollutants (such as organic arsenic, organic tin and mancozeb) and the like, some sites also have acid pollution or alkali pollution, and most sites are in a composite and mixed pollution state.
Aiming at petroleum hydrocarbon, volatile chlorine-free organic pollutants, mercury-polluted soil and oil sludge, the thermal desorption technology is the repairing technology with the shortest repairing time and the most thorough repairing effect.
At present, thermal desorption equipment in the forms of rotary kilns, indirect heat screws, conveyer belt type heating furnaces and the like is used for thermal desorption treatment of chlorine-free semi-volatile organic contaminated soil/mercury contaminated soil/oil sludge at home and abroad, and can effectively remove target pollutants in the contaminated soil. The equipment of the type has the problems of high energy consumption, high consumption of consumables, high hazardous waste disposal capacity and the like. Meanwhile, the problem of recycling of target pollutants generated in the thermal desorption process is not considered.
Disclosure of Invention
The utility model aims to provide a three-phase separation device, a thermal desorption treatment process and a thermal desorption treatment system for volatile contaminated soil, which can effectively remove target pollutants or recover fuel oil in mercury contaminated soil, make the target pollutants or mercury have the possibility of being recovered after being gathered in a three-phase separator, and realize the standard discharge of tail gas and sewage. In addition, the equipment has mobility, and can finish soil remediation engineering of different polluted sites.
The purpose of the utility model is realized by the following technical scheme:
the utility model discloses a three-phase separation device, which comprises a device body, wherein the inner space of the device body is divided into more than two separation cabins in parallel, an overflow device is arranged on the inner upper surface of the device body, a water baffle is arranged between the adjacent separation cabins, the water baffle is arranged in one or two ways of upwards arranging the bottom surface of the device body or downwards arranging the bottom surface of the overflow device, and the top end of the water baffle arranged on the bottom surface of the device body is lower than the bottom surface of the overflow device; a water inlet pipe is arranged on one side of the device body; an LNAPL outlet is arranged on the side wall of the device body which is higher than the overflow device on the other side, a sewage outlet is arranged on the side wall of the device body which is lower than the overflow device, and a mud bucket is arranged at the bottom of each separation cabin.
Further, a base is arranged at the bottom of the device body.
Further, a liquid level meter is arranged inside the device body.
Further, the top end of the device body is provided with an access hole.
The utility model also discloses a thermal desorption treatment process for volatile contaminated soil, which comprises the following steps:
step 1, putting the polluted soil to be treated into thermal desorption equipment through feeding equipment for thermal desorption treatment;
step 2, cooling the thermal desorption tail gas subjected to thermal desorption treatment by adopting an indirect heat exchange mode to obtain cooled mixed liquid and the other part of gas, and purifying the gas;
and 3, sending the mixed liquid cooled in the step 2 into the three-phase separation device of claim 1 for separation, outputting and collecting the separated LNAPL through an LNAPL outlet, outputting and collecting the separated DNAPL and other solid matters through a mud bucket outlet, and outputting the separated sewage through a sewage outlet for further purification treatment.
Further, the sewage output through the sewage outlet in the step 3 is subjected to filtration treatment, air stripping treatment, oxidation treatment and adsorption treatment and then is discharged after reaching the standard.
The utility model also discloses a thermal desorption treatment system for the volatile contaminated soil, which comprises a feeding unit, a thermal desorption unit, a tail gas treatment unit and a sewage treatment unit; wherein the feed unit comprises a conveyor; the thermal desorption unit comprises thermal desorption equipment; the tail gas treatment unit comprises a dust remover, and the dust remover is connected with the heat exchanger; the sewage treatment unit comprises the three-phase separation device and a sewage treatment system connected with the three-phase separation device; the output of conveyer is connected to thermal desorption equipment's input, thermal desorption equipment's tail gas outlet connects the dust remover, the heat transfer medium outlet connection three-phase separator's of heat exchanger inlet tube.
Further, the heat exchanger is an indirect heat exchanger.
Furthermore, a heat exchange gas outlet of the heat exchanger is connected with an active carbon adsorption tank, and a gas outlet of the active carbon adsorption tank is connected with an induced draft fan.
Further, the sewage treatment system comprises a flocculation settling tank, a quartz sand filtering tank, a stripping device and an oxidation tower, wherein a sewage outlet of the three-phase separation device is connected with the flocculation settling tank, the flocculation settling tank is connected with the quartz sand filtering tank, the quartz sand filtering tank is connected with the stripping device, and the stripping device is connected with the oxidation tower.
Further, the feeding unit still includes feed bin, the belt weigher of taking the continuous weighing measurement function, and the conveyer is band conveyer simultaneously, and the exit end of feed bin is connected band conveyer, the belt weigher set up in band conveyer is last, can realize polluting the continuous even entering heat desorption room of soil.
Further, the thermal desorption equipment also comprises a combustor, a combustion chamber and a thermal screw conveyor. The flame generated by the burner heats the combustion chamber and the thermal auger conveyor, and the heat is indirectly transferred to the contaminated soil through the outer wall of the thermal desorption apparatus main body. The retention time of the contaminated soil in the thermal desorption main equipment is 20-30 min, the operation temperature is 500-650 ℃, and the target pollutants can be ensured to be volatilized and desorbed from the contaminated soil.
Further, volatile contaminated soil thermal desorption processing system still includes the discharge unit, the discharge unit includes the conveyer, the conveyer with thermal desorption equipment's material exit linkage.
Furthermore, the discharging unit further comprises a soil humidifying device, and the soil humidifying device is arranged beside the conveyor and used for cooling the discharged high-temperature soil and preventing dust. Preferably, the conveyor is a screw conveyor.
Furthermore, the dust remover of the tail gas treatment unit is a high-temperature cyclone dust remover.
Furthermore, the indirect heat exchanger is vertically arranged, the heat exchange mode is shell-and-tube heat exchange, and an ultrasonic dust removal device can be arranged in the heat exchanger, so that slurry formed by water and dust in high-temperature tail gas in the cooling process is prevented from being adhered to the tubes of the heat exchanger, and the heat exchange efficiency is further influenced; the bottom of the heat exchanger is provided with a dust collecting hopper and a hollow shaft type spiral conveyor, and collected dust can be conveyed to a designated position and is thermally desorbed again after being mixed with moist polluted soil.
Furthermore, the sewage treatment unit comprises a three-phase separation device, a flocculation precipitation device, a quartz sand filter, a blow-off device, an oxidation tower and an activated carbon adsorption device which are sequentially connected with one another. The oxidation tower is provided with an ozone and hydrogen peroxide synergistic oxidation device, and as the solubility of semi-volatile organic matters without chlorine, elemental mercury and petroleum substances in water is very low, in the cooling process of desorption tail gas, a small part of target pollutants are dissolved in condensed water, and most target pollutants exist in the form of LNAPL, DNAPL or elemental substances. The target pollutants are naturally layered after gravity precipitation for a certain time in the three-phase separator, LNAPL is collected to the bottom of the overflow device through the overflow device, the thickness of the LNAPL is gradually increased along with the continuous operation of the thermal desorption equipment, and after a certain amount of the LNAPL is accumulated (the thermal desorption equipment is operated for 2-3 months), the LNAPL is discharged through an LNAPL discharge pipe at the upper part of the three-phase separator and sent to a solvent recovery company for purification and then enters a circular economy industry circle. The DNAPL and the mud at the lower part are gathered in a mud collecting hopper at the bottom of the three-phase separator under the action of gravity, and are periodically discharged into a DNAPL collecting tank under the pumping action of a mud pump, and then are subjected to advanced treatment. The middle relatively clear liquid through gravity separation is conveyed to a flocculation precipitation device to carry out heavy metal removal and flocculation precipitation operation, and then conveyed to a quartz sand filtering device to remove larger particles in sewage, enter a blow-off device to remove VOCs and partial ammonia nitrogen in sewage, and then enter an oxidation tower to carry out synergistic oxidation to destroy organic matters in the sewage, and finally, the liquid is subjected to active carbon adsorption and then is subjected to pipe receiving discharge.
Because sewage is subjected to gravity precipitation separation by the three-phase separator and is not recycled in the thermal desorption system, the amount of target pollutants entering subsequent sewage treatment equipment is greatly reduced, the cost of sewage treatment is greatly reduced, and the continuous and stable operation capacity of the thermal desorption system is ensured.
Further, volatile contaminated soil thermal desorption processing system still includes the control unit, the control unit includes power, cable line connection, temperature multiple spot on-line monitoring and temperature automatic feedback control, pressure multiple spot on-line monitoring and temperature automatic feedback control, system automatic start and shut down, system fault automatic detection and fault signal feedback, system automatic recovery after the trouble is got rid of etc.. The normal operation of the system is ensured by monitoring and controlling the operating temperature in the thermal desorption process and monitoring the air pressure in the system to maintain the system in a micro-negative pressure state.
Furthermore, the thermal desorption treatment system for the volatile contaminated soil can integrate the thermal desorption unit, the tail gas treatment unit and the sewage treatment unit into a steel structure frame with the same size as a standard container respectively, so as to ensure the purposes of rapid transition and reduction of installation workload after the equipment is integrally hoisted.
The desorption tail gas generated by the thermal desorption unit is dedusted by high-temperature cyclone to remove about 70% of dust, then enters an indirect heat exchanger to cool the desorption tail gas at the temperature of 200-350 ℃ to 40-50 ℃, and finally is adsorbed by active carbon to ensure that the tail gas reaches the standard and is discharged. The method for removing dust at high temperature can prevent the target pollutant from condensing and adsorbing and gathering on solid particles removed by the cyclone dust collector, and is convenient for subsequent treatment of tail gas and recovery of the target pollutant.
Because the content of the target pollutants in the cooled tail gas is very low, the service life of the active carbon as a consumable material is greatly prolonged, the cooled tail gas can be ensured to be discharged after reaching the standard after being adsorbed by the active carbon or the quantity of non-condensable gas conveyed to the flame of a burner is greatly reduced, and the tail gas can be subjected to high-temperature incineration harmless treatment at the flame of the burner, so that the discharge of hot air exhaust of a combustion chamber reaching the standard can be ensured.
In the thermal desorption treatment system for the volatile contaminated soil, the tail gas treatment unit and the sewage treatment unit adopt a design concept of gradually reducing the load, so that the treatment scale miniaturization of each part in the unit is ensured to meet the requirements of equipment disassembly, assembly, transportation and transition, and the continuous and stable operation capability of the tail gas treatment unit and the sewage treatment unit is ensured.
According to the thermal desorption treatment system for the volatile contaminated soil, provided by the utility model, after the tail gas is cooled by the indirect heat exchanger, the target pollutants and the residual dust in the tail gas are naturally mixed with the cooling water and enter the sewage treatment system, so that the standard discharge of the target pollutants and the dust in the tail gas treated by the tail gas treatment unit is ensured, the using amount of mobile equipment is saved, the operation cost is also saved, and the thermal desorption treatment system conforms to the green restoration concept.
According to the thermal desorption treatment system for the volatile contaminated soil, provided by the utility model, after sewage enters the three-phase separator, the purpose of natural layering of LNAPL and DNAPL is achieved under the long-time natural separation effect of gravity, so that the risks of increased cost and safety caused by separation of used movable equipment and shutdown and maintenance of the equipment caused by faults of the movable equipment are reduced, and the load of later-stage sewage treatment is also reduced.
Compared with the prior art, the utility model has the following advantages:
(1) the three-phase separation device provided by the utility model can realize the recovery of LNAPL, DNAPL, petroleum substances and mercury, provides possibility for converting hazardous wastes formed by the target pollutants into resource utilization, and realizes the purpose of green restoration;
(2) the thermal desorption treatment system for the volatile contaminated soil provided by the utility model adopts the dust remover and the vertically arranged large-channel indirect heat exchanger to remove dust and cool the high-temperature tail gas, ensures that the target pollutant enters the three-phase separator in a pure substance form, and reduces the load of subsequent tail gas treatment and sewage treatment;
(3) compared with the production of the target pollutants, the purification of the target pollutants by the method has the advantages of less usage amount of social resources and obvious benefits.
(4) The thermal desorption treatment process for the volatile contaminated soil provided by the utility model has the advantages that the types of the contaminated soil can be treated more widely, and the adaptability of the process and equipment is stronger than that of similar products in the market.
Drawings
FIG. 1 is a schematic view of a three-phase separation apparatus as described in example 1;
FIG. 2 is a schematic view of the thermal desorption treatment system for volatile contaminated soil described in example 2;
FIG. 3 is a schematic view of a thermal desorption treatment system for volatile contaminated soil according to example 2, wherein a control unit is added;
in the above fig. 1-3, 1 is a device body, 2 is a separation chamber, 3 is an overflow device, 4 is a water baffle, 5 is a water inlet pipe, 6 is an LNAPL outlet, 7 is a sewage outlet, 8 is a hopper, 9 is a base, 10 is a level gauge, 11 is an access opening, 21 is a feeding unit, 22 is a thermal desorption unit, 23 is a tail gas processing unit, 24 is a sewage processing unit, 25 is a discharging unit, 26 is a control unit, 211 is a conveyor, 212 is a storage bin, 213 is a belt scale, 221 is a thermal desorption device, 231 is a dust remover, 232 is a heat exchanger, 233 is an activated carbon adsorption tank, 234 is an induced draft fan, 241 is a three-phase separation device, 242 is a flocculation precipitation tank, 243 is a quartz sand filtration tank, 244 is a stripping device, 245 is an oxidation tower, 246 is an activated carbon adsorption device, and 251 is a conveyor.
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals indicate the same or structurally similar but functionally identical parts throughout the several views.
Example 1
The embodiment provides a three-phase separation device, as shown in fig. 1, which comprises a device body 1, wherein the inner space of the device body 1 is divided into more than two separation cabins 2 in parallel, and an overflow device 3 is arranged on the inner part of the device body 1; a water baffle 4 is arranged between adjacent separating cabins, the water baffle 4 is arranged on the bottom surface of the device body 1 in an upward mode or on the bottom surface of the overflow device 3 in a downward mode, the top end of the water baffle 4 arranged on the bottom surface of the device body 1 is lower than the bottom surface of the overflow device 3, the separating cabins are separated from each other through the water baffle 4, and a water inlet pipe 5 is arranged on one side of the device body 1; an LNAPL outlet 6 is arranged on the side wall of the device body 1 higher than the overflow device 3 on the other side, a sewage outlet 7 is arranged on the side wall of the device body 1 below the overflow device 3, and a mud bucket 8 is arranged at the bottom of each separation cabin 2; a base 9 is arranged at the bottom of the device body 1, a liquid level meter 10 is arranged inside the device body 1, and an access hole 11 is formed in the top end of the device body 1.
According to the three-phase separation device provided by the embodiment, a primary sludge collecting tank is arranged between the bottom of the first separation cabin and the water inlet pipe through the water baffle, and sewage enters the three-phase separation device and then enters the sludge collecting tank at the bottom of the three-phase separation device to ensure that the sludge in the sewage is not diffused in the three-phase separation device in a large area; then, primarily gravity separating the sewage in a first separation chamber, primarily collecting the separated LNAPL through an overflow device arranged at the upper part of the liquid level, and sinking the DNAPL and the slurry into a sludge settling hopper at the bottom for collecting; in order to ensure that the sewage enters the overflow device due to the rise of the sewage liquid level, a liquid level meter is arranged in the first separation chamber, so that the liquid level can be observed and a high liquid level alarm signal can be provided; the primarily separated sewage enters a second separation chamber through a water baffle for gravity separation, and LNAPL, DNAPL and slurry are separated and collected from the sewage upwards and downwards respectively; and the sewage after the secondary separation enters a third separation chamber through a water baffle for gravity separation, so that LNAPL, DNAPL and mud in the sewage are further reduced, and the collection amount of the LNAPL, the DNAPL and the mud is increased. Through the gravity separation of the separation cabins, the contents of LNAPL and DNAPL at the sewage outlet are greatly reduced, the processing load of subsequent sewage treatment equipment is greatly reduced (the higher the content of organic matters in the polluted soil is, the lower the solubilities of the LNAPL and the DNAPL in water are, the more obvious the processing load is reduced), the operation cost of the sewage treatment unit is also reduced, and the capability of stable operation of the whole system is improved. The working principle of the three-phase separation device belongs to long-time gravity natural separation, and the collected LNAPL and DNAPL can be used as raw materials for recycling economy, so that the method conforms to the concept of green restoration.
Example 2
The embodiment provides a thermal desorption treatment system for volatile contaminated soil, as shown in fig. 2, which includes a feeding unit 21, a thermal desorption unit 22, a tail gas treatment unit 23 and a sewage treatment unit 24; wherein the feeding unit 21 comprises a conveyor 211; the thermal desorption unit 22 comprises a thermal desorption device 221; the tail gas treatment unit 23 comprises a dust remover 231, and the dust remover 231 is connected with a heat exchanger 232; the sewage treatment unit 24 comprises the three-phase separation device 241 of embodiment 1 and a sewage treatment system connected with the three-phase separation device 241; the output end of the conveyor 211 is connected to the input end of the thermal desorption device 221, the tail gas outlet of the thermal desorption device 221 is connected to the dust remover 231, and the heat exchange medium outlet of the heat exchanger 232 is connected to the water inlet pipe of the three-phase separation device 241.
The heat exchanger 232 is an indirect heat exchanger.
The heat exchange gas outlet of the heat exchanger 232 is connected with the activated carbon adsorption tank 233, and the gas outlet of the activated carbon adsorption tank 233 is connected with the induced draft fan 234.
The sewage treatment system comprises a flocculation precipitation tank 242, a quartz sand filter tank 243, a stripping device 244 and an oxidation tower 245, wherein a sewage outlet of the three-phase separation device 241 is connected with the flocculation precipitation tank 242, the flocculation precipitation tank 242 is connected with the quartz sand filter tank 243, the quartz sand filter tank 243 is connected with the stripping device 244, and the stripping device 244 is connected with the oxidation tower 245; further, the oxidation tower 245 is connected to an activated carbon adsorption device 246.
Further, the feeding unit further comprises a storage bin 212 and a belt scale 213 with a continuous weighing and metering function, the conveyor 211 is a belt conveyor, the outlet end of the storage bin 212 is connected with the belt conveyor, and the belt scale 213 is arranged on the belt conveyor.
Further, the thermal desorption equipment also comprises a combustor, a combustion chamber and a thermal spiral conveyor. The flame generated by the burner heats the combustion chamber and the hot screw conveyor.
Further, the thermal desorption treatment system for contaminated soil further comprises a discharge unit 25, wherein the discharge unit 25 comprises a conveyor 251, the conveyor 251 is connected with the material outlet of the thermal desorption device 221, the conveyor 251 is a screw conveyor, and a soil humidifying device is arranged beside the screw conveyor and can humidify the material of the screw conveyor.
Furthermore, the indirect heat exchanger is vertically arranged, the heat exchange mode is shell-and-tube heat exchange, and the ultrasonic dust removing device is arranged in the heat exchanger, so that slurry formed by water and dust in high-temperature tail gas in the cooling process is prevented from being adhered to the tubes of the heat exchanger, and the heat exchange efficiency is further influenced; the bottom of the heat exchanger is provided with a dust collecting hopper and a hollow shaft type screw conveyor, and collected dust can be conveyed to a designated position and mixed with moist polluted soil for thermal desorption again.
Further, as shown in fig. 3, the system further includes a control unit 26, and the control unit 26 is respectively connected to the feeding unit 21, the thermal desorption unit 22, the tail gas treatment unit 23, the sewage treatment unit 24, and the discharging unit 25, and controls operations of the units.
The treatment process of the thermal desorption treatment system for volatile contaminated soil comprises the steps of firstly putting contaminated soil to be treated into thermal desorption equipment through a feeding unit for thermal desorption treatment, cooling the thermal desorption tail gas subjected to the thermal desorption treatment in an indirect heat exchange mode to obtain mixed liquid and another part of gas which are cooled down, and purifying the gas, wherein the specific process comprises the following steps:
step 1, feeding of contaminated soil: the pretreated polluted soil enters a thermal desorption unit through a belt conveyor of a feeding unit;
step 2, thermal desorption treatment of the polluted soil: carrying out thermal desorption on the contaminated soil in thermal desorption equipment under the action of a thermal spiral conveyor of the thermal desorption equipment, wherein the retention time of the contaminated soil in the thermal desorption main equipment is 20-30 min, and the filling rate of the soil in the thermal spiral conveyor is not higher than 10%; the combustor of the thermal desorption equipment is used for heating the combustion chamber and the thermal screw conveyor, and heat is indirectly transferred to the polluted soil through the thermal screw conveyor and the outer wall of the thermal desorption equipment main body. And after the temperature of the polluted soil is increased to 500-650 ℃, the mercury-containing pollutants are volatilized and separated from the soil. In addition, the hot screw conveyor can be provided with a steel shoveling plate and a high-temperature-resistant metal stirring chain, so that the contaminated soil can be fully mixed and stirred, the soil is uniformly heated, and the heat transfer process is enhanced.
And 4, treating the desorption tail gas: the high-temperature desorption tail gas generated by the thermal desorption unit is subjected to dust removal and heat exchange by an indirect heat exchanger under the action of a draught fan, so that solid particles in the gas can be basically removed, the desorption tail gas at the temperature of 300-400 ℃ is cooled to 40-50 ℃ in the indirect heat exchanger, and finally, the desorption tail gas is adsorbed by an activated carbon adsorption tank, so that the tail gas is ensured to be discharged up to the standard;
and 5, recovering the target pollutants: target pollutants in the desorbed tail gas enter the three-phase separator, LNAPL, DNAPL and mercury stay in the three-phase separator for more than 10 hours, the LNAPL is gathered in the overflow device under the combined action of the partition plates, and the LNAPL is recovered after a certain amount of the LNAPL is accumulated; DNAPL, mercury and mud are gathered in a mud bucket at the bottom of the three-phase separator, and are conveyed to a plate-and-frame filter press through a mud pump to be subjected to filter pressing, and then mud cakes are subjected to thermal desorption again or are conveyed to a solvent recovery company to be recovered; or conveying the DNAPL and the thin mud slurry to a recovery vehicle of a solvent recovery company through a sludge pump, and purifying and recovering in the solvent recovery company;
The utility model and its embodiments have been described above schematically, without limitation, and the drawings show only one embodiment of the utility model, without limiting the actual structure. Therefore, if a person skilled in the art receives the teachings of the present invention, without inventive design, a similar structure and an embodiment to the above technical solution should be covered by the protection scope of the present patent.
Claims (10)
1. The three-phase separation device is characterized by comprising a device body (1), wherein the inner space of the device body (1) is divided into more than two separation cabins (2) in parallel, an overflow device (3) is arranged on the inner upper surface of the device body (1), a water baffle (4) is arranged between adjacent separation cabins, the water baffle (4) is arranged in one or two ways of upwards arranging the bottom surface of the device body (1) or downwards arranging the water baffle (4) on the bottom surface of the overflow device (3), and the top end of the water baffle (4) arranged on the bottom surface of the device body (1) is lower than the bottom surface of the overflow device (3); a water inlet pipe (5) is arranged on one side of the device body (1); an LNAPL outlet (6) is arranged on the side wall of the device body (1) which is higher than the overflow device (3) on the other side, a sewage outlet (7) is arranged on the side wall of the device body (1) which is lower than the overflow device (3), and a mud bucket (8) is arranged at the bottom of each separation cabin (2).
2. Three-phase separating device according to claim 1, characterised in that the bottom of the device body (1) is provided with a seat (9).
3. -three-phase separation device according to claim 1, characterised in that inside the device body (1) there is provided a level gauge (10).
4. A three-phase separating device according to claim 1, characterized in that the top end of the device body (1) is provided with an access opening (11).
5. A thermal desorption treatment process for volatile contaminated soil is characterized by comprising the following steps:
step 1, putting the polluted soil to be treated into thermal desorption equipment through feeding equipment for thermal desorption treatment;
step 2, cooling the thermal desorption tail gas subjected to thermal desorption treatment by adopting an indirect heat exchange mode to obtain cooled mixed liquid and the other part of gas, and purifying the gas;
and 3, sending the mixed liquid cooled in the step 2 into the three-phase separation device of claim 1 for separation, outputting and collecting the separated LNAPL through an LNAPL outlet, outputting and collecting the separated DNAPL and other solid matters through a mud bucket outlet, and outputting the separated sewage through a sewage outlet for further purification treatment.
6. The treatment process according to claim 5, wherein the sewage output from the sewage outlet in the step 3 is subjected to filtration treatment, air stripping treatment, oxidation treatment and adsorption treatment and then is discharged after reaching the standard.
7. The thermal desorption treatment system for the volatile contaminated soil is characterized by comprising a feeding unit (21), a thermal desorption unit (22), a tail gas treatment unit (23) and a sewage treatment unit (24); wherein the feeding unit (21) comprises a conveyor (211); the thermal desorption unit (22) comprises thermal desorption equipment (221); the tail gas treatment unit (23) comprises a dust remover (231), and the dust remover (231) is connected with a heat exchanger (232); the sewage treatment unit (24) comprising a three-phase separation device (241) according to claim 1 and a sewage treatment system to which the three-phase separation device (241) is connected; the output of conveyer (211) is connected to the input of thermal desorption equipment (221), the tail gas exit linkage dust remover (231) of thermal desorption equipment (221), the inlet tube of three-phase separator (241) is connected to the heat transfer medium exit linkage of heat exchanger (232).
8. The thermal desorption treatment system of claim 7, wherein the heat exchange gas outlet of the heat exchanger (232) is connected with an activated carbon adsorption tank (233), and the gas outlet of the activated carbon adsorption tank (233) is connected with an induced draft fan (234).
9. The thermal desorption treatment system according to claim 7, wherein the sewage treatment system comprises a flocculation precipitation tank (242), a quartz sand filter tank (243), a blow-off device (244) and an oxidation tower (245), the sewage outlet of the three-phase separation device (241) is connected with the flocculation precipitation tank (242), the flocculation precipitation tank (242) is connected with the quartz sand filter tank (243), the quartz sand filter tank (243) is connected with the blow-off device (244), and the blow-off device (244) is connected with the oxidation tower (245).
10. The thermal desorption treatment system according to claim 7, further comprising an outfeed unit (25), wherein the outfeed unit (25) comprises a conveyor (251), and wherein the conveyor (251) is connected to a material outlet of the thermal desorption apparatus (221).
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| CN202010974011.5A CN112222171B (en) | 2020-09-16 | 2020-09-16 | Three-phase separation device, and thermal desorption treatment process and system for volatile contaminated soil |
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| CN112222171B true CN112222171B (en) | 2022-07-08 |
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| CN112934936A (en) * | 2021-01-28 | 2021-06-11 | 苏州逸凡特环境修复有限公司 | Contaminated soil remediation and sewage purification combined system |
| CN112958604A (en) * | 2021-02-22 | 2021-06-15 | 上海格林曼环境技术有限公司 | Gas-liquid separation method for in-situ remediation of polluted soil and underground water |
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| CN104289513B (en) * | 2014-10-14 | 2016-08-31 | 中节能大地环境修复有限公司 | A kind of mercury contaminated soil thermal desorption processing means and processing method |
| CN210945002U (en) * | 2019-08-27 | 2020-07-07 | 赵峰 | Integral speed-reducing steady-flow three-phase separation sewage treatment device |
| CN210559979U (en) * | 2019-09-11 | 2020-05-19 | 中原康 | Oily sludge three-phase separation device |
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