CN115318818B - Multifunctional multi-mode integrated soil ex-situ remediation system and method - Google Patents
Multifunctional multi-mode integrated soil ex-situ remediation system and method Download PDFInfo
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- CN115318818B CN115318818B CN202210836653.8A CN202210836653A CN115318818B CN 115318818 B CN115318818 B CN 115318818B CN 202210836653 A CN202210836653 A CN 202210836653A CN 115318818 B CN115318818 B CN 115318818B
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- 239000002689 soil Substances 0.000 title claims abstract description 168
- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000005067 remediation Methods 0.000 title claims abstract description 51
- 238000011066 ex-situ storage Methods 0.000 title claims abstract description 12
- 239000003814 drug Substances 0.000 claims abstract description 117
- 239000007788 liquid Substances 0.000 claims abstract description 111
- 239000007787 solid Substances 0.000 claims abstract description 92
- 238000003756 stirring Methods 0.000 claims abstract description 71
- 238000003860 storage Methods 0.000 claims abstract description 47
- 230000008439 repair process Effects 0.000 claims abstract description 34
- 238000002386 leaching Methods 0.000 claims abstract description 26
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 23
- 238000005243 fluidization Methods 0.000 claims abstract description 22
- 238000000605 extraction Methods 0.000 claims abstract description 17
- 230000006641 stabilisation Effects 0.000 claims abstract description 14
- 238000011105 stabilization Methods 0.000 claims abstract description 14
- 230000008023 solidification Effects 0.000 claims abstract description 13
- 238000007711 solidification Methods 0.000 claims abstract description 13
- 238000003795 desorption Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- 230000008569 process Effects 0.000 claims description 25
- 230000008878 coupling Effects 0.000 claims description 21
- 238000010168 coupling process Methods 0.000 claims description 21
- 238000005859 coupling reaction Methods 0.000 claims description 21
- 238000005507 spraying Methods 0.000 claims description 21
- 238000005728 strengthening Methods 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 11
- 235000011837 pasties Nutrition 0.000 claims description 10
- 239000012071 phase Substances 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 239000008346 aqueous phase Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- 239000003480 eluent Substances 0.000 claims description 6
- 239000011362 coarse particle Substances 0.000 claims description 5
- 239000003344 environmental pollutant Substances 0.000 claims description 5
- 231100000719 pollutant Toxicity 0.000 claims description 5
- 238000002076 thermal analysis method Methods 0.000 claims description 5
- 239000002265 redox agent Substances 0.000 claims description 4
- 238000005273 aeration Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 3
- 230000033116 oxidation-reduction process Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 15
- 238000001914 filtration Methods 0.000 description 13
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 239000005416 organic matter Substances 0.000 description 6
- 239000011343 solid material Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 238000012216 screening Methods 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- 238000009835 boiling Methods 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
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- 239000003802 soil pollutant Substances 0.000 description 2
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- 239000006028 limestone Substances 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- 229940126589 solid medicine Drugs 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
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Classifications
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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
- B09C1/08—Reclamation of contaminated soil chemically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a multifunctional multi-mode integrated soil ex-situ remediation system and method, the system comprises an integrated remediation device, a liquid medicament storage tank and a solid medicament storage tank, the integrated remediation device comprises a remediation barrel body and stirring paddles transversely arranged in the remediation barrel body, a gas inlet is further arranged at the bottom of the remediation barrel body, a gas fluidization distributor is further arranged at the gas inlet, a liquid feed inlet, a solid feed inlet and an exhaust outlet are further arranged at the top of the remediation barrel body, the liquid feed inlet and the solid feed inlet are respectively communicated with the liquid medicament storage tank and the solid medicament storage tank, and a discharge outlet is further arranged at the bottom of the remediation barrel body. Compared with the prior art, the method has the functions of solidification stabilization repair and leaching repair for heavy metal pollution, oxidation reduction, thermal desorption, vapor extraction and the like for organic pollutants.
Description
Technical Field
The invention belongs to the technical field of soil and restoration, and relates to a multifunctional multi-mode integrated soil ex-situ restoration system and method.
Background
With the development of the environment-friendly industry in China, the soil remediation technology is increasingly gaining social importance, and the multifunctional soil rapid remediation technology and the remediation method which can be used in complex environments or under sudden pollution conditions gradually become the focus of attention in the industry. At present, the traditional soil remediation technology mainly comprises single medicament remediation, leaching remediation or thermal desorption remediation technical equipment and the like, has limited functions and low integration degree, is difficult to realize a complex scene of coping with multiple pollution, and has great limitation in use of corresponding technical equipment.
Chinese patent 201610918974.7 discloses a multifunctional multi-mode integrated device for soil remediation, which comprises a screening unit, a feeding unit, a stirring unit and a control unit, wherein the screening unit and the feeding unit are arranged in parallel from inside to outside, the stirring unit is arranged on the left side of the feeding unit, and the stirring unit is provided with the control unit for controlling the whole device. This multi-functional multimode integration equipment is restoreed to soil adopts screening unit, feed unit, stirring unit and control unit to realize that soil intelligence is restoreed, and work efficiency is high, uses manpower sparingly financial resources. However, the equipment has single repair process and mode, and can not solve the problems of tail gas and waste water generated in the repair process.
Chinese patent 201910332008.0 discloses an intelligent integrated soil remediation device and a remediation method, wherein the output ends of a crushing and screening system, a remediation material step-by-step adding system and a liquid adding system of the device are connected with the output end of a mixing and stirring system, the output end of the mixing and stirring system is connected with the output end of a mixing and conveying system, and the output end of the mixing and conveying system is connected with a system. The repairing method comprises the following steps: 1) Determining the required repair material and water quantity; 2) Calculating the required usage amount of the repairing material and the liquid; 3) Starting each system; 4) Adding soil into the crushing and screening system, uniformly mixing and reacting the soil with a repairing material, a liquid material or water, and conveying the repaired soil to a maintenance area; 5) And (5) sampling and detecting the repaired soil, and finishing the repair after the detection is qualified. The invention can realize the efficient solidification, stabilization and restoration of heavy metal contaminated soil, solid waste, sludge and other materials, and has good restoration effect on heavy metal composite contaminated soil. However, the repairable soil in the invention has relatively single types, can only be suitable for the repairable soil by solidification/stabilization, and has extremely limited application scenes.
Disclosure of Invention
The invention aims to provide a multifunctional multi-mode integrated soil ex-situ remediation system and method, which can flexibly use different processes to cope with heavy metal, organic matters or composite pollution thereof and have a reinforced coupling technical means.
The aim of the invention can be achieved by the following technical scheme:
the invention provides a multifunctional multi-mode integrated soil ectopic repairing system which comprises an integrated repairing device, a liquid medicament storage tank and a solid medicament storage tank, wherein the integrated repairing device comprises a repairing cylinder body and stirring paddles transversely arranged in the repairing cylinder body, a gas inlet is further arranged at the bottom of the repairing cylinder body, a gas fluidization distributor is further arranged at the gas inlet, a liquid feed inlet, a solid feed inlet and an exhaust port are further arranged at the top of the repairing cylinder body, the liquid feed inlet and the solid feed inlet are respectively communicated with the liquid medicament storage tank and the solid medicament storage tank, and a discharge port is further arranged at the bottom of the repairing cylinder body. Here, the "gas fluidization distributor" is a conventional "gas distributor".
Further, a liquid spray pipe connected with the liquid feed inlet is also arranged in the repairing cylinder.
Further, the stirring paddle is rotatably arranged in the repairing cylinder body through a stirring shaft which is horizontally arranged, and the stirring shaft is also connected with an external stirring driving piece. Here, the stirring driver may be a stirring motor.
Furthermore, the outer wall of the repair cylinder is also provided with a heat exchange jacket, and the heat exchange jacket is also provided with a jacket circulating liquid inlet and a jacket circulating liquid outlet.
Further, the exhaust port is also sequentially connected with a cyclone separator, an induced draft fan and a gas-water separator, a coarse particle outlet at the bottom of the cyclone separator is also connected to the soil to be repaired in a return mode, two branches are also led out from the outlet of the gas-water separator, one branch is connected with a tail gas treatment device, and the other branch is connected with a water treatment device. Specifically, the particle size of small separated soil particles of the cyclone separator is 5 mu m, and the coarse particle outlet at the bottom of the cyclone separator can directly discharge the particles to the soil to be repaired. The tail gas treatment device can adopt active carbon adsorption equipment commonly used in the field, can also adopt other equipment in a composite form such as RTO/TO or RCO/CO and the like, and aims TO ensure that gas reaches relevant emission standards.
Further, the air inlet is also connected with an air inlet valve, an air heater and an air inlet fan in sequence. The air heater can adopt heating modes including but not limited to electrode heating, infrared heating, resistance heating, water heating and the like, and the heating temperature and power can be adjusted according to the process requirements, so that the principle of convenient process and cost saving is followed.
Further, a solid feeder is arranged between the solid medicament storage tank and the repair cylinder. The solid feeder adopts the feeding equipment of the solid materials commonly used in the field, the feeding mode can adopt a spiral feeding structure or a vibration feeding structure, and the feeding rate can be adjusted according to the working requirement of the system.
Further, a liquid feeding pump and a liquid inlet valve are arranged between the liquid medicament storage tank and the repairing cylinder.
Further, a collecting tank is further arranged below the discharge hole, a soil discharge valve is arranged on the collecting tank, and the collecting tank is further connected with a filter feed valve, a filter feed pump and a filter mechanism in sequence. Specifically, the filtering mechanism can adopt filtering equipment such as a plate-frame filter, a cloth-bag filter and the like, and the selected filtering equipment has the optimal automatic discharging function. Meanwhile, the filtering precision of the filtering mechanism can reach 1 mu m at most.
The second technical proposal of the invention provides a multifunctional multi-mode integrated soil ex-situ remediation method, which is based on the remediation system, and the method is divided into a medicament method for remediating the polluted soil mode, a thermal desorption matching vapor extraction remediation organic polluted soil mode and a leaching method for remediating the heavy metal polluted soil mode, wherein the medicament method for remediating the polluted soil mode is divided into two modes of remediating the heavy metal polluted soil by a solidifying and stabilizing medicament and remediating the organic matter polluted soil by a redox medicament,
the specific process of repairing the polluted soil mode by the medicament method comprises the following steps:
(1) Solid medicament feed: firstly starting a stirring paddle to a set rotating speed, and then adding a solid solidification stabilization agent or a redox agent in a solid agent storage tank and soil to be repaired into a repair cylinder from a solid feed inlet;
(2) Aqueous phase medicament feed: at the same time of feeding the solid medicament, spraying and feeding the solidifying and stabilizing medicament or the redox medicament of the water phase into the repairing cylinder from the liquid medicament storage tank;
(3) After the feeding of the solid medicament and the water-phase medicament is completed, stirring and mixing are carried out for a set time, and then the soil restoration is completed; the solid medicament feeding and the water phase medicament feeding are matched, so that dust in the feeding process can be prevented from being excessively large, and the mixing efficiency can be improved.
The specific process of thermal analysis matching vapor extraction for repairing the organic contaminated soil mode comprises the following steps:
1) Preheating the repair cylinder, starting a stirring paddle to a set rotating speed, and adding soil to be repaired into the repair cylinder from a solid feed inlet;
2) After the feeding of the soil to be repaired is finished, aerating the soil in the repair cylinder from a gas fluidization distributor at a gas inlet, and enabling the soil to reach a microfluidization state (microfluidization means that soil particles reach a fluidization state but do not reach a boiling state, wherein the state can be observed through a feeding hole of equipment, pressure change can be observed at an air inlet, and when the feeding hole is in the microfluidization state, gauge pressure is zero), so as to accelerate desorption of pollutants, and opening an air outlet and treating tail water of tail gas in the soil repair process;
the specific process of repairing heavy metal contaminated soil mode by leaching method is as follows:
(a) Feeding: starting a stirring paddle to a set rotating speed, and adding the soil to be restored into the restoration cylinder from the solid feed inlet;
(b) Stirring and leaching: after the soil feeding is completed, spraying and feeding the eluent from the liquid medicament storage tank to the repairing cylinder until the set liquid-solid ratio is reached, obtaining a pasty solid-liquid mixture and continuing stirring;
(c) Solid-liquid separation and discharging: and after the stirring and leaching are finished, discharging the pasty solid-liquid mixture, and carrying out solid-liquid separation to obtain the restored soil.
Furthermore, the modes of restoring the polluted soil by the medicament method, restoring the organic polluted soil by the thermal desorption matching vapor extraction method and restoring the heavy metal polluted soil by the leaching method can be mutually coupled, and a coupling strengthening restoring mode is formed, wherein the coupling strengthening restoring mode comprises a medicament restoring strengthening coupling mode and a leaching restoring heavy metal strengthening coupling mode.
Further, the medicament repairing and reinforcing coupling mode is as follows:
solid medicament feed: firstly starting a stirring paddle to a set rotating speed, and then adding a solid solidification stabilization agent or a redox agent in a solid agent storage tank and soil to be repaired into a repair cylinder from a solid feed inlet;
aqueous phase medicament feed: at the same time of feeding the solid medicament, spraying and feeding the solidifying and stabilizing medicament or the redox medicament of the water phase into the repairing cylinder from the liquid medicament storage tank;
after the feeding of the solid medicament and the aqueous medicament is completed, continuously aerating the soil in the restoration cylinder from the gas fluidization distributor of the gas inlet, and enabling the soil to reach a microfluidization state so as to strengthen the soil restoration effect;
the leaching repair reinforced coupling mode is as follows:
starting a stirring paddle to a set rotating speed, and adding the soil to be restored into the restoration cylinder from the solid feed inlet;
after the soil feeding is completed, spraying and feeding the eluent from the liquid medicament storage tank to the repairing cylinder until the set liquid-solid ratio is reached, obtaining a pasty solid-liquid mixture and continuing stirring;
then, the soil in the remediation cylinder is aerated from the gas fluidization distributor of the gas inlet, and the slurry-like solid-liquid mixture is allowed to reach an aeration state (microfluidization means that soil particles reach a fluidization state but do not reach a boiling state, and the state can be observed through a feeding hole of the equipment, and pressure change can be observed through an air inlet and can be also observed through the air inlet, and when the soil is in the microfluidization state, gauge pressure is zero), so that the soil remediation effect is enhanced.
In addition, the invention relates to the redox reagent used in the soil remediation process, which can be an organic or inorganic reagent, and the specific reagent form and the polluted soil pollutant are all reagents conventionally used in the field, and do not belong to the design point of the invention. In addition, the repairing process is at normal temperature and normal pressure, and has no other requirements.
Compared with the prior art, the invention has the following advantages:
(1) An intelligent movable equipment system integrating the repair function of heavy metal, organic matters or the composite contaminated soil thereof relates to the technical processes including but not limited to solidification and stabilization technology, redox technology, thermal analysis technology, vapor extraction technology, leaching technology and the like, and has high equipment integration level and wide application range.
(2) The system can flexibly switch modes, can mobilize the operation of a specific repair module according to the process requirements, and realizes the intensified coupling of various repair technologies by means of intensified heat and mass transfer and the like.
(3) The system is attached with tail gas, tail water and solid-liquid separation equipment, and the purpose of rapidly repairing soil without pollution can be realized according to requirements.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic structural view of an integrated prosthetic device;
the figure indicates:
1-exhaust port, 2-jacket circulating liquid outlet, 3-liquid inlet, 4-stirring driving piece, 5-heat exchange jacket, 6-gas fluidization distributor, 7-rack, 8-collecting tank, 9-gas inlet, 10-stirring shaft, 11-jacket circulating liquid inlet, 12-stirring paddle, 13-liquid spray pipe, 14-solid inlet, 15-integrated repairing device, 16-solid feeder, 17-solid medicine storage tank, 18-exhaust valve, 19-liquid inlet valve, 20-liquid feed pump, 21-liquid medicine storage tank, 22-induced draft fan, 23-gas-water separator, 24-separator liquid outlet valve, 25-tail gas treatment device, 26-water treatment device, 27-cyclone separator, 28-air inlet fan, 29-air heater, 30-air inlet valve, 31-discharge valve, 32-soil discharge valve, 33-filter feed valve, 34-feed pump, 35-filter mechanism, 36-filter liquid outlet valve.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments or examples of the present invention are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are correspondingly changed.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; may be directly connected or indirectly connected through an intermediate medium, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments or examples of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the embodiments or examples, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the combination of the technical solutions does not exist, and is not within the scope of protection required by the present invention.
The invention provides a multifunctional multi-mode integrated soil ex-situ remediation system, which can be seen in fig. 1 and 2, and comprises an integrated remediation device 15, a liquid medicament storage tank 21 and a solid medicament storage tank 17, wherein the integrated remediation device 15 comprises a remediation cylinder body, and a stirring paddle 12 transversely arranged in the remediation cylinder body, the bottom of the remediation cylinder body is also provided with a gas inlet 9, the gas inlet 9 is also provided with a gas fluidization distributor 6, the top of the remediation cylinder body is also provided with a liquid feed inlet 3, a solid feed inlet 14 and an exhaust port 1, the liquid feed inlet 3 and the solid feed inlet 14 are respectively communicated with the liquid medicament storage tank 21 and the solid medicament storage tank 17, and the bottom of the remediation cylinder body is also provided with a discharge port.
In some specific embodiments, a liquid spraying pipe 13 connected with the liquid feeding port 3 is further arranged in the repairing cylinder.
In some embodiments, the stirring paddle 12 is rotatably installed in the repair cylinder by a stirring shaft 10 horizontally arranged, and the stirring shaft 10 is also connected with the external stirring driving member 4. Here, the stirring driver 4 may be a stirring motor.
In some specific embodiments, the outer wall of the repair cylinder is further provided with a heat exchange jacket 5, and a jacket circulating fluid inlet 11 and a jacket circulating fluid outlet 2 are further arranged on the heat exchange jacket 5.
In some specific embodiments, the exhaust port 1 is further connected to a cyclone separator 27, an induced draft fan 22 and a gas-water separator 23 in sequence, a coarse particle outlet at the bottom of the cyclone separator 27 is further connected back to the soil to be repaired, and two branches are further led out from the outlet of the gas-water separator 23, one of which is connected to the tail gas treatment device 25, and the other of which is connected to the water treatment device 26. Specifically, the cyclone 27 has a particle size of 5 μm in the small separated soil particles, and a coarse particle outlet at the bottom thereof can discharge the particles directly to the soil to be remediated. The tail gas treatment device 25 may be an activated carbon adsorption device commonly used in the art, or may be other devices in a composite form such as RTO/TO or RCO/CO, so as TO enable the gas TO reach the relevant emission standard, the specific structure of the tail gas treatment device is not required TO be protected by the invention, and the water treatment device 26 is also a device commonly used in the art for treating heavy metal wastewater or organic pollutant wastewater, mainly for treating the tail water TO reach the standard and then discharging the tail water.
In some embodiments, the gas inlet 9 is further connected to a gas inlet valve 30, an air heater 29 and a gas inlet fan 28 in this order. The air heater 29 may take the form of heating including, but not limited to, electrode heating, infrared heating, resistance heating, water heating, etc., and the heating temperature and power may be adjusted according to the process requirements, following the principles of convenience of the process and cost saving.
In some embodiments, a solid feeder 16 is also provided between the solid medicament reservoir 17 and the reconditioning cylinder. The solid feeder 16 employs a solid material feeding device commonly used in the art, and the feeding mode may be a screw feeding structure or a vibration feeding structure, and the feeding rate may be adjusted according to the working requirement of the system.
In some embodiments, a liquid feeding pump 20 and a liquid feeding valve 19 are further arranged between the liquid medicament storage tank 21 and the repairing cylinder.
In some specific embodiments, a collecting tank 8 is further arranged below the discharge hole, a soil discharge valve 32 is arranged on the collecting tank 8, and the collecting tank 8 is further connected with a filter feed valve 33, a filter feed pump 34 and a filter mechanism 35 in sequence. Specifically, the filtering mechanism 35 may be a plate-frame filter, a cloth-bag filter or other filtering device, and the selected filtering device has an optimal automatic discharging function. Meanwhile, the filtering accuracy of the filtering mechanism 35 can reach up to 1 μm.
The invention also provides a multifunctional multi-mode integrated soil ex-situ remediation method, which is based on the remediation system, and the method is divided into a medicament method for remediating the polluted soil mode, a thermal desorption matching vapor extraction remediation organic polluted soil mode and a leaching method for remediating the heavy metal polluted soil mode, wherein the medicament method for remediating the polluted soil mode is divided into two modes of remediating the heavy metal polluted soil by a solidifying and stabilizing medicament and repairing the organic matter polluted soil by a redox medicament,
the specific process of repairing the polluted soil mode by the medicament method comprises the following steps:
(1) Solid medicament feed: firstly, starting a stirring paddle 12 to a set rotating speed, and then adding a solid solidification stabilization medicament or a redox medicament in a solid medicament storage tank 17 and soil to be restored into a restoration cylinder from a solid feed inlet 14;
(2) Aqueous phase medicament feed: at the same time of feeding the solid chemical, spraying and feeding the solidifying and stabilizing chemical or the redox chemical of the aqueous phase from the liquid chemical storage tank 21 to the repairing cylinder;
(3) After the feeding of the solid medicament and the water-phase medicament is completed, stirring and mixing are carried out for a set time, and then the soil restoration is completed;
the specific process of thermal analysis matching vapor extraction for repairing the organic contaminated soil mode comprises the following steps:
1) Preheating the repairing cylinder, starting the stirring paddle 12 to a set rotating speed, and adding soil to be repaired into the repairing cylinder from the solid feed inlet 14;
2) After the feeding of the soil to be repaired is finished, the soil in the repair cylinder is aerated from the gas fluidization distributor 6 of the gas inlet 9, and the soil is enabled to reach a microfluidization state (microfluidization means that soil particles reach a fluidization state but do not reach a boiling state, the state can be observed through a feeding hole of the equipment, pressure change can be observed at an air inlet, when the feeding hole is in the microfluidization state, the gauge pressure is zero), so that the desorption of pollutants is accelerated, and in the soil repair process, the exhaust outlet 1 is opened and tail gas tail water is treated;
the specific process of repairing heavy metal contaminated soil mode by leaching method is as follows:
(a) Feeding: starting a stirring paddle 12 to a set rotating speed, and adding soil to be restored into the restoration cylinder from a solid feed inlet 14;
(b) Stirring and leaching: after the soil feeding is completed, spraying and feeding the eluent from the liquid medicament storage tank 21 to the repairing cylinder until the set liquid-solid ratio is reached, obtaining a pasty solid-liquid mixture and continuing stirring;
(c) Solid-liquid separation and discharging: and after the stirring and leaching are finished, discharging the pasty solid-liquid mixture, and carrying out solid-liquid separation to obtain the restored soil.
In some specific embodiments, the modes of repairing the contaminated soil by the medicament method, repairing the organic contaminated soil by the thermal desorption matching vapor extraction method and repairing the heavy metal contaminated soil by the leaching method can be mutually coupled, and a coupling strengthening repairing mode is formed, wherein the coupling strengthening repairing mode comprises a medicament repairing strengthening coupling mode and a leaching repairing heavy metal strengthening coupling mode.
Further, the medicament repairing and reinforcing coupling mode is as follows:
solid medicament feed: firstly, starting a stirring paddle 12 to a set rotating speed, and then adding a solid solidification stabilization medicament or a redox medicament in a solid medicament storage tank 17 and soil to be restored into a restoration cylinder from a solid feed inlet 14;
aqueous phase medicament feed: at the same time of feeding the solid chemical, spraying and feeding the solidifying and stabilizing chemical or the redox chemical of the aqueous phase from the liquid chemical storage tank 21 to the repairing cylinder;
after the feeding of the solid medicament and the aqueous medicament is completed, continuously aerating the soil in the restoration cylinder from the gas fluidization distributor 6 of the gas inlet 9, and enabling the soil to reach a microfluidization state so as to strengthen the soil restoration effect;
the leaching repair reinforced coupling mode is as follows:
starting a stirring paddle 12 to a set rotating speed, and adding soil to be restored into the restoration cylinder from a solid feed inlet 14;
after the soil feeding is completed, spraying and feeding the eluent from the liquid medicament storage tank 21 to the repairing cylinder until the set liquid-solid ratio is reached, obtaining a pasty solid-liquid mixture and continuing stirring;
then, the soil in the remediation cylinder is aerated from the gas fluidization distributor 6 of the gas inlet 9, and the slurry-like solid-liquid mixture is brought into an aeration state (here, "microfluidization" means that the soil particles are brought into a fluidized state, but not into a boiling state, and this state can be observed through the apparatus feed inlet, and a pressure change can be observed by adding a pressure apparent pressure change to the air inlet, and the gauge pressure is zero when in the microfluidization state), so as to enhance the soil remediation effect.
The above embodiments are described in more detail below in connection with specific examples.
Example 1
The embodiment provides a multifunctional multi-mode integrated intelligent soil ex-situ remediation system, referring to fig. 1, the system mainly comprises an integrated remediation device 15, a solid feeder 16, a solid medicament storage tank 17, an exhaust valve 18, a liquid inlet valve 19, a liquid feed pump 20, a liquid medicament storage tank 21, an induced draft fan 22, a gas-water separator 23, a separator liquid outlet valve 24, a tail gas treatment device 25, a water treatment device 26, a cyclone separator 27, an air inlet fan 28, an air heater 29, an air inlet valve 30, a discharge valve 31, a soil discharge valve 32, a filter feed valve 33, a filter feed pump 34, a filtering mechanism 35 and a filter liquid outlet valve 36, wherein the integrated remediation device 15 comprises an exhaust port 1, a jacket circulation liquid outlet 2, a liquid feed port 3, a stirring driving piece 4 (namely, a stirring motor), a heat exchange jacket 5, a gas fluidization distributor 6, a rack 7, a collection tank 8, a gas inlet 9, a stirring shaft 10, a jacket circulation liquid inlet 11, a stirring paddle 12, a liquid spray pipe 13 and a solid feed port 14.
The solid feed inlet 14 of the integrated repairing device 15 is respectively connected with the solid feeder and the feed channel of the soil to be repaired, and can independently feed the soil to be repaired or the solid medicament into the integrated machine or can be mixed for feeding, and the solid feeder is connected with the solid medicament storage tank 17; the liquid feed inlet 3 of the integrated repairing device 15 is connected with the liquid feed valve 19, and the liquid feed valve 19, the liquid feed pump 20 and the liquid medicament storage tank 21 are connected; the exhaust port 1 of the integrated repairing device 15 is connected with the exhaust valve 18, and the exhaust valve 18 is connected with the cyclone separator 27; cyclone separator 27 is connected with induced draft fan 22, and the separated solids can fall into the soil area to be remediated; the induced draft fan 22 is connected with the gas-water separator 23, the gas-water separator 23 is respectively connected with the tail gas treatment device 25 and the water treatment device 26, and a separator liquid outlet valve 24 is connected between the gas-water separator 23 and the water treatment device 26; the air inlet 9 of the integrated repairing device 15 is connected with an air inlet valve 30, and the air inlet fan 28, the air heater 29 and the air inlet valve 30 are sequentially connected; the collecting tank 8 of the integrated repairing device 15 is respectively connected with a soil discharge valve 32 and a filter feed valve 33, the filter feed valve 33, a filter feed pump 34, a filter mechanism 35 and a filter outlet valve 36 are sequentially connected, and the filter outlet valve 36 is connected with the water treatment device 26.
In this embodiment, the integrated repairing device 15 is a 2-axis horizontal stirring device, the processing capacity is about 500 Kg/time, and is provided with a DN200 discharge port, a DN200 liquid inlet (i.e., a liquid inlet 3), a DN25 air inlet (i.e., a gas inlet 9), a DN25 air outlet 1 and other process ports, the outer cylinder wall has a jacket structure, heat conducting oil is introduced into the interior, and 6 fluidization air inlet structures (i.e., 6 gas fluidization distributors 6) are installed at the bottom of the cylinder.
In this embodiment, the solid state feeder is in the form of a screw feeding structure, and the screw rotation rate can be adjusted according to the working requirement of the system, so that the feeding rate is adjusted to be 0-50kg/min.
In this example, the cyclone 27 is placed above the raw soil and the minimum size of the separated soil particles is 5 μm.
In this embodiment, the air heater 29 is in the form of resistance heating, and the air heating density can be controlled in the range of normal temperature-80 ℃.
In this embodiment, the filtering mechanism 35 is a plate-frame filter, the filtering precision can reach 5 μm at the highest, and the selected filter has an automatic cake unloading function.
In this embodiment, the exhaust gas treatment device 25 is an activated carbon adsorption device.
In this embodiment, the water treatment device 26 may treat heavy metal wastewater, or may treat wastewater containing organic pollutants.
In the embodiment, the soil pollutant is Pb, the pollution concentration is about 2800mg/kg, and the solidification stabilization reinforced coupling repair technology is adopted. Setting and stirring speed to be 50r/min in advance, and the mass ratio of the medicament to the soil is 3:100, the total solid medicament feed was 5kg.
The method for restoring the soil ex-situ in the embodiment adopts a mode of restoring the polluted soil by a medicament method, and comprises the following specific processes:
(1) Soil to be restored and powder medicament
The stirring driver 4 was turned on, and a suitable feed rate was controlled to 10kg/h to 25kg/h, and then a solid chemical (industrial sodium thiosulfate) and soil to be remediated were added to the solid feed port 14.
(2) Spray-curing stabilization agent
And at the same time of feeding the solid materials, the liquid inlet valve 19 and the liquid feed pump 20 are opened, the liquid feed port 3 and the liquid spray pipe 13 are used for spraying the liquid solidification stabilization medicament (limestone, the concentration is 3 wt%) into the integrated repairing device 15 from the liquid medicament storage tank 21, the spraying flow is 25L/min, the spraying pressure is 0.6Mpa, and after the medicament spraying amount is finished, the liquid inlet valve 19 and the liquid feed pump 20 are closed. After the addition of the soil to be repaired and the agent is completed, the air inlet fan 28 is started to ventilate the soil and enable the soil to reach a microfluidization state, so that the mixing and mass transfer disturbance processes of the agent are accelerated, and the solidification, stabilization and repair are accelerated.
(3) Discharging material
After 15min of operation, all the equipment and valves are closed, the discharge valve 31 and the soil discharge valve 32 are opened, the batch repairing operation is completed, and the subsequent feeding is waited.
And (5) after the discharged restored soil is static for 48 hours, detecting the leaching toxicity of lead element in the soil. Compared with a simple excavator, the leaching concentration of heavy metal Pb is 56mg/kg after the strengthening technology is implemented, and the removal rate is 98%.
Example 2:
the system of example 1 was used to perform remediation of benzene contaminated soil at a concentration of 120mg/kg using oxidative remediation coupled thermal desorption/vapor extraction.
The implementation process specifically comprises the following steps:
(1) Preheating and feeding of equipment
Firstly, a jacket circulating fluid inlet 11 and a jacket circulating fluid outlet 2 on a heat exchange jacket 5 are opened, the equipment cylinder of the integrated repairing device 15 is preheated to 60 ℃, then a stirring motor is started, the stirring speed is adjusted to 150r/min, and 500kg of soil to be repaired is rapidly added into the solid feed inlet 14.
(2) Spraying an oxidizing agent
At the same time of feeding solid material, a liquid inlet valve 19 and a liquid feed pump 20 are opened to spray NaS from a liquid medicament storage tank 21 to the integrated repairing device 15 through a liquid feed port 3 and a liquid spray pipe 13 2 O 8 The concentration of the NaOH medicament is 3 per mill/5 per mill respectively, the spraying flow is 20L/min, the spraying pressure is 0.8Mpa, and when the medicament spraying amount is finished, the liquid inlet valve 19 and the liquid feeding pump 20 are closed.
(3) Blowing in heated air and starting vapor extraction
After the solid material feeding is finished, an air inlet fan 28, an air heater 29 and an air inlet valve 30 are started, 50 ℃ of air is introduced into the interior through the air fluidization distributor 6 of the integrated repairing device 15, the soil is enabled to reach a microfluidization state, and an air outlet valve 18, an induced draft fan 22, a gas-water separator 23, a separator liquid outlet valve 24, a tail gas treatment device 25 and a water treatment device 26 are opened.
(4) Discharging material
After the stirring and mixing and vapor extraction time reaches 30min, all the equipment and valves are closed, the discharge valve 31 and the restored soil discharge valve 32 are opened, the batch restoration work is completed, and the subsequent feeding is waited.
Through test analysis, the benzene organic matter in the restored soil is reduced to 3.6mg/kg from the original 120mg/kg, and the organic matter content is reduced by 97% compared with the original soil, so that the purpose of quick and efficient restoration is achieved.
Example 3:
in comparison with example 2, the vast majority are identical, except that the bottom gas inlet 9 is always closed, i.e. not aerated during soil remediation.
In the process, the step (3) does not blow heating air any more, and vapor extraction operation is directly performed, specifically, after the solid material feeding is finished, the exhaust valve 18, the induced draft fan 22, the gas-water separator 23, the separator liquid outlet valve 24, the tail gas treatment device 25 and the water treatment device 26 are opened. And (3) stirring and mixing the process step (4) and performing spot check analysis on the pollutant content in the soil after the gas phase extraction time reaches 30 min: the benzene organic matter in the restored soil is reduced from 120mg/kg to 41mg/kg, the organic matter content is reduced by 65.8% compared with the original soil, the pollutant content is still higher, and the stirring and extraction work needs to be continued.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (3)
1. The multifunctional multi-mode integrated soil ectopic repairing method is characterized by being implemented based on an integrated soil ectopic repairing system, wherein the integrated soil ectopic repairing system comprises an integrated repairing device, a liquid medicament storage tank and a solid medicament storage tank, the integrated repairing device comprises a repairing cylinder body and stirring paddles transversely arranged in the repairing cylinder body, a gas inlet is further arranged at the bottom of the repairing cylinder body, a gas fluidization distributor is further arranged at the gas inlet, a liquid feed port, a solid feed port and an exhaust port are further arranged at the top of the repairing cylinder body, the liquid feed port and the solid feed port are respectively communicated with the liquid medicament storage tank and the solid medicament storage tank, and a discharge port is further arranged at the bottom of the repairing cylinder body;
the repair cylinder is internally provided with a liquid spray pipe connected with the liquid feed inlet;
the stirring paddle is rotatably arranged in the repairing cylinder body through a stirring shaft which is horizontally arranged, and the stirring shaft is also connected with an external stirring driving piece;
the outer wall of the repairing cylinder body is also provided with a heat exchange jacket, and the heat exchange jacket is also provided with a jacket circulating liquid inlet and a jacket circulating liquid outlet;
the exhaust port is also sequentially connected with a cyclone separator, an induced draft fan and a gas-water separator, a coarse particle outlet at the bottom of the cyclone separator is also connected to the soil to be repaired in a return way, and two branches are also led out from the outlet of the gas-water separator, wherein one branch is connected with a tail gas treatment device, and the other branch is connected with a water treatment device;
the method is divided into a medicament method for restoring the polluted soil mode, a thermal desorption matching vapor extraction mode for restoring the organic polluted soil mode and a leaching method for restoring the heavy metal polluted soil mode, wherein the medicament method for restoring the polluted soil mode is divided into two modes of solidifying and stabilizing medicament for restoring the heavy metal polluted soil and redox medicament for restoring the organic polluted soil,
the specific process of repairing the polluted soil mode by the medicament method comprises the following steps:
(1) Solid medicament feed: firstly starting a stirring paddle to a set rotating speed, and then adding a solid solidification stabilization agent or a redox agent in a solid agent storage tank and soil to be repaired into a repair cylinder from a solid feed inlet;
(2) Aqueous phase medicament feed: at the same time of feeding the solid medicament, spraying and feeding the solidifying and stabilizing medicament or the redox medicament of the water phase into the repairing cylinder from the liquid medicament storage tank;
(3) After the feeding of the solid medicament and the water-phase medicament is completed, stirring and mixing are carried out for a set time, and then the soil restoration is completed;
the specific process of thermal analysis matching vapor extraction for repairing the organic contaminated soil mode comprises the following steps:
1) Preheating the repair cylinder, starting a stirring paddle to a set rotating speed, and adding soil to be repaired into the repair cylinder from a solid feed inlet;
2) After the feeding of the soil to be repaired is finished, the soil in the repair cylinder body is ventilated from the gas fluidization distributor of the gas inlet, and the soil is enabled to reach a microfluidization state so as to accelerate the desorption of pollutants, and in the soil repair process, an exhaust port is opened and tail gas tail water is treated;
the specific process of repairing heavy metal contaminated soil mode by leaching method is as follows:
(a) Feeding: starting a stirring paddle to a set rotating speed, and adding the soil to be restored into the restoration cylinder from the solid feed inlet;
(b) Stirring and leaching: after the soil feeding is completed, spraying and feeding the eluent from the liquid medicament storage tank to the repairing cylinder until the set liquid-solid ratio is reached, obtaining a pasty solid-liquid mixture and continuing stirring;
(c) Solid-liquid separation and discharging: after the stirring and leaching are completed, discharging the pasty solid-liquid mixture and carrying out solid-liquid separation to obtain the restored soil;
the modes of restoring the polluted soil by the medicament method, restoring the organic polluted soil by the thermal analysis matching vapor extraction method and restoring the heavy metal polluted soil by the leaching method can be mutually coupled to form a coupling strengthening restoring mode, and the coupling strengthening restoring mode comprises a medicament restoring strengthening coupling mode and a leaching restoring heavy metal strengthening coupling mode;
the medicament repairing and reinforcing coupling mode is as follows:
solid medicament feed: firstly starting a stirring paddle to a set rotating speed, and then adding a solid solidification stabilization agent or a redox agent in a solid agent storage tank and soil to be repaired into a repair cylinder from a solid feed inlet;
aqueous phase medicament feed: at the same time of feeding the solid medicament, spraying and feeding the solidifying and stabilizing medicament or the redox medicament of the water phase into the repairing cylinder from the liquid medicament storage tank;
after the feeding of the solid medicament and the aqueous medicament is completed, continuously aerating the soil in the restoration cylinder from the gas fluidization distributor of the gas inlet, and enabling the soil to reach a microfluidization state so as to strengthen the soil restoration effect;
the leaching repair reinforced coupling mode is as follows:
starting a stirring paddle to a set rotating speed, and adding the soil to be restored into the restoration cylinder from the solid feed inlet;
after the soil feeding is completed, spraying and feeding the eluent from the liquid medicament storage tank to the repairing cylinder until the set liquid-solid ratio is reached, obtaining a pasty solid-liquid mixture and continuing stirring;
then, the gas fluidization distributor at the gas inlet ventilates the soil in the remediation cylinder, and the pasty solid-liquid mixture reaches an aeration state, so that the soil remediation effect is enhanced.
2. The multifunctional multi-mode integrated soil ex-situ remediation method according to claim 1, wherein the gas inlet is further connected with an air inlet valve, an air heater and an air inlet fan in sequence;
a solid feeder is arranged between the solid medicament storage tank and the repair cylinder;
and a liquid feeding pump and a liquid inlet valve are further arranged between the liquid medicament storage tank and the repairing cylinder body.
3. The multifunctional multi-mode integrated soil ex-situ remediation method according to claim 1, wherein a collecting tank is further arranged below the discharge hole, a soil discharge valve is arranged on the collecting tank, and the collecting tank is further sequentially connected with a filter feed valve, a filter feed pump and a filter mechanism.
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