CN115318818A - 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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- 239000007788 liquid Substances 0.000 claims abstract description 113
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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 a 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 and a stirring paddle transversely arranged in the remediation barrel, a gas inlet is further arranged at the bottom of the remediation barrel, a gas fluidization distributor is further arranged at the gas inlet, a liquid feeding port, a solid feeding port and an exhaust port are further arranged at the top of the remediation barrel, the liquid feeding port and the solid feeding 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 remediation barrel. Compared with the prior art, the invention has the functions of curing stabilization repair and leaching repair aiming at heavy metal pollution, oxidation reduction, thermal desorption, gas phase extraction and the like aiming at organic pollutants.
Description
Technical Field
The invention belongs to the technical field of soil and remediation, and relates to a multifunctional multi-mode integrated soil ex-situ remediation system and method.
Background
With the development of the environmental protection industry in China, the soil remediation technology is more and more emphasized by the society, and the multifunctional soil rapid remediation technology and the remediation method which can be used in complex environments or under sudden pollution conditions become a focus of attention in the industry gradually. At present, the traditional soil remediation technology is mainly single agent remediation, leaching remediation or thermal desorption remediation technology equipment and the like, has limited functions and low integration degree, is difficult to deal with complex scenes with multiple pollutants, and restricts the use of corresponding technical equipment, so that the traditional soil remediation technology has great limitation.
Chinese patent 201610918974.7 discloses a multi-functional multi-mode integration equipment of soil remediation, including screening unit, feed unit, stirring unit and the control unit, one outer parallel mount in screening unit and the feed unit, the stirring unit is installed in the feed unit left side, is equipped with the control unit on the stirring unit and is used for controlling whole device. This multi-functional multi-mode integration equipment is restoreed to soil adopts screening unit, feed unit, stirring unit and the control unit to realize that soil intelligence is restoreed, and work efficiency is high, the financial resources of using manpower sparingly. But the equipment has single repair process and mode, and cannot solve the problem of tail gas and waste water generated in the repair process.
Chinese patent 201910332008.0 discloses intelligent integrated soil remediation equipment and a remediation method, wherein the output ends of a crushing and screening system, a repair material step-by-step feeding system and a liquid feeding system of the equipment are connected with the output end of a blending and stirring system, the output end of the blending and stirring system is connected with the output end of a blending and conveying system, and the output end of the blending and conveying system is connected with a system. The repairing method comprises the following steps: 1) Determining a repairing material and water quantity to be added; 2) Calculating the usage amount of the needed repairing material and 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 sampling and detecting the repaired soil, and finishing repairing after the detection is qualified. The invention can realize the efficient solidification and stabilization repair of materials such as heavy metal contaminated soil, solid waste, sludge and the like, and has good repair effect on heavy metal composite contaminated soil. However, the soil capable of being repaired in the invention is single in type, only suitable for soil capable of being cured/stabilized and repaired, and the application scene is extremely limited.
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 deal with heavy metals, organic matters or compound pollution thereof and have a reinforced coupling technical means.
The purpose of the invention can be realized by the following technical scheme:
one of the technical schemes of the invention provides a multifunctional multi-mode integrated soil ex-situ remediation system, which comprises an integrated remediation device, a liquid medicament storage tank and a solid medicament storage tank, wherein the integrated remediation device comprises a remediation barrel and a stirring paddle transversely arranged in the remediation barrel, a gas inlet is further arranged at the bottom of the remediation barrel, a gas fluidization distributor is further arranged at the gas inlet, a liquid feeding hole, a solid feeding hole and an exhaust port are further formed in the top of the remediation barrel, the liquid feeding hole and the solid feeding hole are respectively communicated with the liquid medicament storage tank and the solid medicament storage tank, and a discharge hole is further formed in the bottom of the remediation barrel. Here, a "gas fluidization distributor" is a conventional "gas distributor".
Furthermore, a liquid spraying pipe connected with the liquid feeding hole is further arranged in the repairing cylinder body.
Furthermore, the stirring paddle rotate through the horizontal (mixing) shaft and install in restoreing the barrel, the (mixing) shaft still is connected with outside stirring driving piece. Here, the stirring driving member may be a stirring motor.
Furthermore, the outer wall of the repair 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.
Further, the gas vent still connect gradually cyclone, draught fan and gas-water separator, cyclone's bottom coarse grain export still returns to be connected to and treats the soil department of restoreing, gas-water separator's export still draw forth two branches, one of them connects tail gas processing apparatus, another connects water processing apparatus. Specifically, the cyclone has a small separated soil particle size of 5 μm, and a coarse particle outlet at the bottom of the cyclone can discharge the particles directly to the soil to be restored. The tail gas treatment device can adopt active carbon adsorption equipment commonly used in the field, and can also be other equipment in a composite form such as RTO/TO or RCO/CO and the like, so that the gas reaches related emission standards.
Furthermore, the gas inlet is also sequentially connected with an air inlet valve, an air heater and an air inlet fan. The air heater can adopt heating forms including but not limited to electrode heating, infrared heating, resistance heating, water heating and the like, the heating temperature and power can be adjusted according to process requirements, and the principle of convenient process and cost saving is followed.
Furthermore, a solid feeder is arranged between the solid medicament storage tank and the repairing cylinder body. The solid feeder adopts solid material feeding equipment 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 further arranged between the liquid medicament storage tank and the repairing cylinder body.
Furthermore, the below of discharge gate still is equipped with the collecting vat, is equipped with the soil relief valve on this collecting vat, the collecting vat still connects gradually filter feed valve, filter charge pump and filtering mechanism. Specifically, the filtering mechanism can adopt a plate-frame filter, a cloth-bag filter and other filtering equipment, and the selected filtering equipment has the best automatic discharging function. Meanwhile, the filtering precision of the filtering mechanism can reach 1 μm at most.
The second technical scheme of the invention provides a multifunctional multi-mode integrated soil ex-situ remediation method, which is based on the remediation system and comprises a mode of remedying the contaminated soil by a medicament method, a mode of remedying the organic contaminated soil by thermal desorption matching and vapor extraction, and a mode of remedying the heavy metal contaminated soil by a leaching method, wherein the mode of remedying the contaminated soil by the medicament method comprises two modes of remedying the heavy metal contaminated soil by a curing and stabilizing medicament and remedying the organic contaminated soil by an oxidation-reduction medicament,
the specific process of the mode of repairing the polluted soil by the medicament method comprises the following steps:
(1) Feeding a solid medicament: starting a stirring paddle to a set rotating speed, and then adding a solid curing stabilizing agent or an oxidation reduction agent in a solid agent storage tank and soil to be repaired into a repairing cylinder from a solid feeding hole;
(2) Feeding water-phase medicaments: at the same time of feeding the solid medicament, spraying and feeding the curing stabilizing medicament or the oxidation reduction medicament of the water phase into the repairing cylinder from the liquid medicament storage tank;
(3) After the solid medicament and the water-phase medicament are fed, stirring and mixing for a set time to finish soil remediation; the solid medicament feeding and the water-phase medicament feeding are matched, so that the dust can be prevented from being excessively generated in the feeding process, and the mixing efficiency can be improved.
The specific process of the mode of thermal desorption matched with vapor extraction for repairing the organic contaminated soil comprises the following steps:
1) Preheating the repairing cylinder, starting a stirring paddle to a set rotating speed, and adding soil to be repaired into the repairing cylinder from a solid feeding hole;
2) When the feeding of the soil to be repaired is finished, ventilating the soil in the repairing cylinder from a gas fluidization distributor of a gas inlet, and enabling the soil to reach a microfluidization state (the microfluidization here means that soil particles reach a fluidization state but do not reach a boiling state, the state can be observed through a device feeding port, or a pressure gauge can be added into a gas inlet to observe pressure change, when the soil is in the microfluidization state, the gauge pressure is zero), so as to accelerate the desorption of pollutants, and in the soil repairing process, opening a gas outlet and treating tail water of tail gas;
the specific process of the leaching method for repairing the heavy metal contaminated soil mode comprises the following steps:
(a) Feeding: starting the stirring paddle to a set rotating speed, and adding the soil to be restored into the restoration cylinder from the solid feeding hole;
(b) Stirring and leaching: after the soil feeding is finished, spraying and feeding leacheate from a liquid medicament storage tank to the repair cylinder until a set liquid-solid ratio is reached to obtain a slurry solid-liquid mixture and continuously stirring;
(c) Solid-liquid separation and discharging: and after stirring and leaching are finished, discharging the slurry solid-liquid mixture, and performing solid-liquid separation to obtain the restored soil.
Furthermore, the mode of repairing the polluted soil by using a medicament method, the mode of repairing the organic polluted soil by using a thermal desorption matching gas-phase extraction method and the mode of repairing the heavy metal polluted soil by using a leaching method can be mutually coupled to form a coupling strengthening repair mode, wherein the coupling strengthening repair mode comprises a medicament repairing strengthening coupling mode and a leaching repairing heavy metal strengthening coupling mode.
Furthermore, the drug repair reinforced coupling mode is as follows:
feeding a solid medicament: starting a stirring paddle to a set rotating speed, and then adding a solid curing stabilizing agent or an oxidation reduction agent in a solid agent storage tank and soil to be repaired into a repairing cylinder from a solid feeding hole;
feeding a water-phase medicament: spraying and feeding the water-phase solidification stabilization medicament or redox medicament from the liquid medicament storage tank into the repair cylinder body while feeding the solid medicament;
after the solid medicament and the water-phase medicament are fed, continuously ventilating the soil in the repairing cylinder from the gas fluidization distributor at the gas inlet, and enabling the soil to reach a micro-fluidization state so as to strengthen the soil repairing effect;
the leaching repair strengthening coupling mode is as follows:
starting the stirring paddle to a set rotating speed, and adding the soil to be restored into the restoration cylinder from the solid feeding hole;
after the soil feeding is finished, spraying and feeding leacheate into the repairing cylinder from the liquid medicament storage tank until a set liquid-solid ratio is reached to obtain a slurry solid-liquid mixture and continuously stirring;
then, the soil in the remediation cylinder is aerated from a gas fluidization distributor of the gas inlet, and the slurry-like solid-liquid mixture is in an aeration state (the term "microfluidization" in this case means that soil particles are in a fluidization state, but do not reach a boiling state, and the state can be observed through a feed port of the device, or pressure change can be observed by adding a pressure gauge to the gas inlet, and when the soil particles are in the microfluidization state, the gauge pressure is zero), so as to enhance the soil remediation effect.
In addition, the soil remediation process of the invention can use redox agents, and can use organic or inorganic agents, and the specific forms of the agents and the pollutants in the polluted soil are all conventional agents in the field, and are not the design points of the invention. In addition, the repairing process of the invention is normal temperature and normal pressure, and has no other requirements.
Compared with the prior art, the invention has the following advantages:
(1) The intelligent movable equipment system integrates the heavy metal, organic matter or compound contaminated soil remediation function, relates to the technical processes including but not limited to a solidification stabilization technology, an oxidation reduction technology, a thermal desorption technology, a gas phase extraction technology, a leaching technology and the like, and has high equipment integration level and wide application range.
(2) The system can flexibly carry out multi-mode switching, can adjust the running of a specific repairing module according to the process requirement, and realizes the strengthened coupling of various repairing technologies by means of strengthening heat and mass transfer and the like.
(3) The system is attached with tail gas, tail water and solid-liquid separation equipment, and the aim of rapidly repairing soil without pollution can be fulfilled according to requirements.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic structural view of an integrated prosthetic device;
the notation in the figure is:
1-exhaust port, 2-jacket circulating liquid outlet, 3-liquid feed port, 4-stirring driving piece, 5-heat exchange jacket, 6-gas fluidization distributor, 7-frame, 8-collecting tank, 9-gas inlet, 10-stirring shaft, 11-jacket circulating liquid inlet, 12-stirring paddle, 13-liquid spraying pipe, 14-solid feed port, 15-integrated restoration device, 16-solid feeder, 17-solid medicament storage tank, 18-exhaust valve, 19-liquid inlet valve, 20-liquid feed pump, 21-liquid medicament 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-filter feed pump, 35-filter mechanism, 36-filter liquid outlet valve.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
It should be noted that all the directional indicators (such as up, down, left, right, front, back, 8230; \8230;) in the embodiments or examples of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise explicitly stated or limited, the terms "connected", "fixed", and the like are to be understood broadly, for example, "fixed" may be fixedly connected, may be detachably connected, or may be integrated; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art can understand the specific meaning of the above terms in the present invention according to specific situations.
In addition, technical solutions between the various embodiments or examples of the present invention may be combined with each other, but must be based on the realization of the capability of a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not to be within the protection scope of the present invention.
The invention provides a multifunctional multi-mode integrated soil ex-situ remediation system, which can be seen in a figure 1 and a figure 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 and a stirring paddle 12 transversely arranged in the remediation cylinder, the bottom of the remediation cylinder 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 is also provided with a liquid feed port 3, a solid feed port 14 and an exhaust port 1, the liquid feed port 3 and the solid feed port 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 is also provided with a discharge port.
In some specific embodiments, a liquid spray pipe 13 connected with the liquid inlet 3 is further arranged in the repairing cylinder.
In some specific embodiments, the stirring paddle 12 is rotatably installed in the repairing cylinder through a horizontal stirring shaft 10, and the stirring shaft 10 is further connected with an external stirring driving member 4. Here, the stirring drive member 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 the heat exchange jacket 5 is further provided with a jacket circulation liquid inlet 11 and a jacket circulation liquid outlet 2.
In some specific embodiments, the exhaust port 1 is further sequentially connected with a cyclone separator 27, an induced draft fan 22 and a gas-water separator 23, a coarse particle outlet at the bottom of the cyclone separator 27 is further connected to the soil to be repaired in a returning manner, two branches are further led out from an outlet of the gas-water separator 23, one branch is connected with a tail gas treatment device 25, and the other branch is connected with a water treatment device 26. Specifically, the cyclone 27 has a small separated soil particle size of 5 μm, and a coarse particle outlet at the bottom thereof can discharge the particles directly to the soil to be restored. The tail gas treatment device 25 can adopt active carbon adsorption equipment commonly used in the field, and can also be other equipment in a composite form such as RTO/TO or RCO/CO and the like, so that the gas reaches the relevant emission standard.
In some embodiments, the gas inlet 9 is further connected to an air inlet valve 30, an air heater 29 and an air inlet fan 28 in sequence. The air heater 29 may adopt heating forms 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 convenient process and cost saving.
In some embodiments, a solid feeder 16 is disposed between the solid medicament reservoir 17 and the repair cylinder. The solid feeder 16 is a feeding device for solid materials commonly used in the art, and the feeding mode may be a screw feeding structure or a vibration feeding structure, and the feeding rate can be adjusted according to the working requirement of the system.
In some specific embodiments, a liquid feeding pump 20 and a liquid inlet valve 19 are further arranged between the liquid medicament storage tank 21 and the repair cylinder.
In some specific embodiments, a collecting tank 8 is further arranged below the discharge port, 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 filtering mechanism 35 in sequence. Specifically, the filtering mechanism 35 may be a plate filter, a bag filter or other filtering devices, and the selected filtering device has the best automatic discharging function. Meanwhile, the filtering precision of the filtering mechanism 35 can reach 1 μm at most.
The invention also provides a multifunctional multi-mode integrated soil ex-situ remediation method which is based on the remediation system and comprises a mode of remedying the contaminated soil by a medicament method, a mode of remedying the organic contaminated soil by thermal desorption matching and vapor extraction, and a mode of remedying the heavy metal contaminated soil by a leaching method, wherein the mode of remedying the contaminated soil by the medicament method comprises two modes of remedying the heavy metal contaminated soil by a curing and stabilizing medicament and remedying the organic contaminated soil by an oxidation-reduction medicament,
the specific process of the mode for remedying the polluted soil by the medicament method comprises the following steps:
(1) Feeding a solid medicament: starting the stirring paddle 12 to a set rotating speed, and then adding the solid curing stabilizing agent or the oxidation reduction agent in the solid agent storage tank 17 and the soil to be repaired into the repairing cylinder from the solid feed inlet 14;
(2) Feeding water-phase medicaments: while feeding the solid medicament, spraying and feeding the curing and stabilizing medicament or the oxidation reduction medicament of the water phase into the repairing cylinder from the liquid medicament storage tank 21;
(3) After the solid medicament and the water-phase medicament are fed, stirring and mixing for a set time, and completing soil remediation;
the specific process of the mode of thermal desorption matched with vapor extraction for repairing the organic contaminated soil 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 feeding hole 14;
2) When the feeding of the soil to be repaired is finished, ventilating the soil in the repairing cylinder from the gas fluidization distributor 6 of the gas inlet 9, and enabling the soil to reach a microfluidization state (the microfluidization state means that soil particles reach a fluidization state but do not reach a boiling state, the state can be observed through a device feeding hole, a pressure gauge can be added into a gas inlet to observe pressure change, when the soil is in the microfluidization state, the gauge pressure is zero), so as to accelerate the desorption of pollutants, and in the soil repairing process, opening the gas outlet 1 and treating tail gas tail water;
the specific process of the leaching method for repairing the heavy metal contaminated soil mode comprises the following steps:
(a) Feeding: starting the stirring paddle 12 to a set rotating speed, and adding the soil to be restored into the restoration cylinder from the solid feeding hole 14;
(b) Stirring and leaching: after the soil feeding is finished, spraying and feeding leacheate from the liquid medicament storage tank 21 to the repair cylinder until a set liquid-solid ratio is reached to obtain a slurry solid-liquid mixture and continuously stirring;
(c) Solid-liquid separation and discharging: and after stirring and leaching are completed, discharging the slurry solid-liquid mixture, and performing solid-liquid separation to obtain the restored soil.
In some specific embodiments, the mode for remedying the contaminated soil by using the pharmaceutical method, the mode for remedying the organic contaminated soil by using the thermal desorption matching vapor extraction method and the mode for remedying the heavy metal contaminated soil by using the leaching method can be mutually coupled to form a coupling strengthening remediation mode, and the coupling strengthening remediation mode comprises a pharmaceutical strengthening coupling mode and a leaching strengthening coupling mode.
Further, the agent repair enhanced coupling mode is as follows:
feeding a solid medicament: starting the stirring paddle 12 to a set rotating speed, and then adding the solid curing stabilizing agent or the oxidation reduction agent in the solid agent storage tank 17 and the soil to be repaired into the repairing cylinder from the solid feed inlet 14;
feeding water-phase medicaments: while feeding the solid medicament, spraying and feeding the curing and stabilizing medicament or the oxidation reduction medicament of the water phase into the repairing cylinder from the liquid medicament storage tank 21;
after the solid medicament and the water-phase medicament are fed, continuously ventilating the soil in the repairing cylinder from the gas fluidization distributor 6 of the gas inlet 9, and enabling the soil to reach a micro-fluidization state so as to strengthen the soil repairing effect;
the leaching repair reinforced coupling mode is as follows:
starting the stirring paddle 12 to a set rotating speed, and adding the soil to be restored into the restoration cylinder from the solid feeding hole 14;
after the soil feeding is finished, spraying and feeding leacheate from the liquid medicament storage tank 21 to the repair cylinder until a set liquid-solid ratio is reached to obtain a slurry solid-liquid mixture and continuously 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 aerated state (here, "microfluidization" means that the soil particles are brought into a fluidized state, but not brought into a boiling state, and this state can be observed through the feed port of the facility, or a pressure gauge can be added to the gas inlet to observe the pressure change, and when the soil particles are brought into a microfluidization state, the gauge pressure is zero), so as to enhance the soil remediation effect.
The above embodiments will be described in more detail with reference to specific examples.
Example 1
The embodiment provides a multi-functional multi-mode integration intelligent soil dystopy repair system, refer to fig. 1, the system mainly comprises integration prosthetic devices 15, solid feeder 16, solid medicament storage tank 17, discharge valve 18, feed liquor valve 19, liquid charge pump 20, liquid medicament storage tank 21, draught fan 22, deareator 23, separator play liquid valve 24, tail gas processing apparatus 25, water processing apparatus 26, cyclone separator 27, air inlet fan 28, air heater 29, admission valve 30, discharge valve 31, soil relief valve 32, filter feed valve 33, filter feed pump 34, filter mechanism 35 and filter play liquid valve 36, integration prosthetic devices 15 includes gas vent 1, jacket circulation liquid export 2, liquid feed inlet 3, stirring driving piece 4 (stirring motor), heat transfer jacket 5, gas fluidization distributor 6, frame 7, collecting vat 8, gas inlet 9, stirring shaft 10, jacket circulation liquid import 11, stirring paddle 12, liquid shower 13, solid feed inlet 14.
The solid feeding hole 14 of the integrated restoration device 15 is respectively connected with a solid feeder and a feeding channel of soil to be restored, the soil restoration or the solid medicament can be fed into the integrated machine independently or in a mixed manner, and the solid feeder is connected with a solid medicament storage tank 17; the liquid feed port 3 of the integrated repairing device 15 is connected with a liquid inlet valve 19, and the liquid inlet valve 19, a liquid feed pump 20 and a liquid medicament storage tank 21 are connected; the exhaust port 1 of the integrated restoration device 15 is connected with the exhaust valve 18, and the exhaust valve 18 is connected with the cyclone separator 27; the cyclone separator 27 is connected with the induced draft fan 22, and the separated solids can fall into the soil area to be repaired; the induced draft fan 22 is connected with a gas-water separator 23, the gas-water separator 23 is respectively connected with a tail gas treatment device 25 and a 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 gas inlet 9 of the integrated repairing device 15 is connected with the 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 restoration 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 liquid valve 36 are sequentially connected, and the filter liquid valve 36 is connected with the water treatment device 26.
In this embodiment, the integrated repair device 15 is a 2-axis horizontal stirring device, has a processing capacity of about 500 Kg/time, and is provided with process ports such as a DN200 discharge port, a DN200 liquid inlet (i.e., a liquid feed port 3), a DN25 air inlet (i.e., a gas inlet 9) and a DN25 exhaust port 1, a jacket structure is arranged on an outer cylinder wall, heat conducting oil is introduced into the jacket structure, 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 feeder is in the form of a screw feeding structure, and the screw rotation rate can be adjusted according to the system working requirement, so that the feeding rate is adjusted to 0-50kg/min.
In this embodiment, the cyclone 27 is placed above the raw soil, and the minimum particle size of the separated soil is 5 μm.
In this embodiment, the air heater 29 is in the form of resistance heating, and can control the air heating density to be within the range of normal temperature to 80 ℃.
In the embodiment, the filtering mechanism 35 is a plate-and-frame filter, the highest filtering precision can reach 5 μm, and the selected filter has an automatic cake discharging function.
In this embodiment, the tail gas treatment device 25 is an activated carbon adsorption device.
In this embodiment, the water treatment device 26 may be used for treating heavy metal wastewater, and may also be used for treating wastewater containing organic pollutants.
In the embodiment, the soil pollutant is Pb, the pollution concentration is about 2800mg/kg, and a solidification stabilization strengthening coupling repairing technology is adopted. Setting in advance and setting the stirring speed to be 50r/min, wherein the mass ratio of the medicament to the soil is 3:100, total solid dose of 5kg.
The soil ectopic repair method of the embodiment adopts a mode of repairing polluted soil by a medicament method, and the specific process is as follows:
(1) Soil and powder chemical to be repaired
The agitation drive 4 is turned on and the appropriate feed rate is controlled between 10kg/h and 25kg/h, and then the solid agent (industrial sodium thiosulfate) and the soil to be remediated are added to the solid feed port 14.
(2) Spraying, solidifying and stabilizing medicine
At the same time of feeding solid materials, the liquid inlet valve 19 and the liquid inlet pump 20 are opened to spray a solution-like solidified stabilizing agent (limestone with the concentration of 3 wt%) from the liquid agent storage tank 21 into the integrated repair device 15 through the liquid inlet 3 and the liquid spray pipe 13, the spray flow is 25L/min, the spray pressure is 0.6Mpa, and when the agent spray amount is finished, the liquid inlet valve 19 and the liquid inlet pump 20 are closed. After the soil to be repaired and the agent are added, the air inlet fan 28 is started to ventilate the soil and enable the soil to reach a microfluidization state, so that the uniform mixing and mass transfer disturbance processes of the agent are accelerated, and the solidification stabilization repair is accelerated.
(3) Discharging material
After 15min of work, all equipment and valves are closed, the discharge valve 31 and the soil discharge valve 32 are opened, the batch of repair work is completed, and the follow-up feeding is waited.
And (5) after the discharged restored soil is static for 48 hours, detecting the leaching toxicity of the lead element in the soil. Compared with the simple digging machine with uniform stirring, the leaching concentration of the heavy metal Pb after the strengthening technology is implemented is 56mg/kg, and the removal rate is 98%.
Example 2:
the system of example 1 was used to remediate benzene contaminated soil at a contaminant concentration of 120mg/kg using a technical route of oxidative remediation coupled with thermal desorption/vapor extraction.
The implementation process specifically comprises the following steps:
(1) Preheating and feeding of equipment
Firstly, opening a jacket circulating liquid inlet 11 and a jacket circulating liquid outlet 2 on a heat exchange jacket 5, preheating an equipment cylinder of an integrated remediation device 15 to 60 ℃, then starting a stirring motor, adjusting the stirring speed to 150r/min, and quickly adding 500kg of soil to be remediated into a solid feed inlet 14.
(2) Spraying oxidizing agent
When solid materials are fed, the liquid inlet valve 19 and the liquid inlet pump 20 are opened to spray NaS from the liquid agent storage tank 21 into the integrated repair device 15 through the liquid inlet 3 and the liquid spray pipe 13 2 O 8 NaOH agent with concentration of 3 per mill/5 per mill, spraying flow rate of 20L/min, and spraying pressure of 0.8Mpa, and stopping liquid inlet valve 19 and liquid inlet pump 20 after the spraying amount of agent is completed.
(3) Blowing heated air and starting vapor extraction
After the solid material feeding is finished, the air inlet fan 28, the air heater 29 and the air inlet valve 30 are started, 50 ℃ air is introduced into the soil through the gas fluidization distributor 6 of the integrated repairing device 15 to enable the soil to reach a micro-fluidization state, and 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.
(4) Discharging
And when the stirring, mixing and vapor extraction time reaches 30min, closing all equipment and valves, opening the discharge valve 31 and the repaired soil discharge valve 32, completing the repairing work of the batch, and waiting for subsequent feeding.
Through test analysis, the benzene organic matter in the restored soil is reduced to 3.6mg/kg from the original 120mg/kg, the organic matter content is reduced by 97 percent compared with the original soil, and the aim of quick and efficient restoration is achieved.
Example 3:
in comparison with example 2, most of them are the same, except that the gas inlet 9 at the bottom is always closed, i.e. not aerated during the soil remediation process.
And (3) directly performing vapor extraction operation without blowing heating air in the step (3), specifically, after the solid material feeding is finished, opening the exhaust valve 18, the draught 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. And (5) after the stirring, mixing and gas phase extraction time in the process step (4) needs to reach 30min, performing spot check to analyze the content of the pollutants in the soil: the benzene organic matter in the restored soil is reduced to 41mg/kg from the original 120mg/kg, the organic matter content is reduced by 65.8 percent compared with the original soil, the pollutant content is still high, and the stirring and extraction work is required to be continued.
The embodiments described above are intended to facilitate a person of ordinary skill in the art in understanding and using the invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, 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 embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The utility model provides a multi-functional multi-mode integration soil ectopic repair system, a serial communication port, including integration prosthetic devices, liquid medicament storage tank and solid medicament storage tank, integration prosthetic devices is including repairing the barrel and transversely arranging the stirring rake at repairing the barrel, gas inlet has still been arranged to the bottom of repairing the barrel, still is equipped with gaseous fluidization distributor in gas inlet department, the top of repairing the barrel still is equipped with liquid feed inlet, solid feed inlet and gas vent, liquid feed inlet and solid feed inlet communicate respectively liquid medicament storage tank with the solid medicament storage tank, the bottom of repairing the barrel still is equipped with the discharge gate.
2. The multifunctional multi-mode integrated soil ex-situ remediation system as claimed in claim 1, wherein a liquid spray pipe connected with the liquid feed port is further arranged in the remediation cylinder.
3. The system of claim 1, wherein the stirring paddles are rotatably mounted in the remediation cylinder through a horizontally transverse stirring shaft, and the stirring shaft is further connected with an external stirring driving member.
4. The multifunctional multi-mode integrated soil ex-situ remediation system as claimed in claim 1, wherein a heat exchange jacket is further arranged on the outer wall of the remediation cylinder, and a jacket circulation fluid inlet and a jacket circulation fluid outlet are further arranged on the heat exchange jacket.
5. The system of claim 1, characterized in that the gas vent still connects gradually cyclone, draught fan and gas-water separator, cyclone's bottom coarse grain export still returns and is connected to the soil department that awaits repairing, gas-water separator's export still draw forth two branches, one of them connection tail gas processing apparatus, another connection water processing apparatus.
6. The multifunctional multi-mode integrated soil ex-situ remediation system as claimed in 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 also arranged between the solid medicament storage tank and the repairing cylinder body;
and a liquid feeding pump and a liquid inlet valve are also arranged between the liquid medicament storage tank and the repairing cylinder body.
7. The multifunctional multi-mode integrated soil ex-situ remediation system as claimed in claim 1, wherein a collecting tank is further arranged below the discharge port, 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 filtering mechanism in sequence.
8. A multifunctional multi-mode integrated soil ex-situ remediation method based on the remediation system as claimed in any one of claims 1 to 7, wherein the method is divided into a mode of remedying the contaminated soil by a pharmacological method, a mode of remedying the organic contaminated soil by thermal desorption matching vapor phase extraction, and a mode of remedying the heavy metal contaminated soil by a leaching method, the mode of remedying the contaminated soil by the pharmacological method is divided into two modes of remedying the heavy metal contaminated soil by a curing and stabilizing agent and remedying the organic contaminated soil by an oxidation-reduction agent,
the specific process of the mode of repairing the polluted soil by the medicament method comprises the following steps:
(1) Feeding a solid medicament: starting a stirring paddle to a set rotating speed, and then adding a solid curing stabilizing agent or an oxidation reduction agent in a solid agent storage tank and soil to be repaired into a repairing cylinder from a solid feeding hole;
(2) Feeding water-phase medicaments: at the same time of feeding the solid medicament, spraying and feeding the curing stabilizing medicament or the oxidation reduction medicament of the water phase into the repairing cylinder from the liquid medicament storage tank;
(3) After the solid medicament and the water-phase medicament are fed, stirring and mixing for a set time, and completing soil remediation;
the specific process of the mode of thermal desorption matched with vapor extraction for repairing the organic contaminated soil comprises the following steps:
1) Preheating the repairing cylinder, starting a stirring paddle to a set rotating speed, and adding soil to be repaired into the repairing cylinder from a solid feeding hole;
2) When the feeding of the soil to be repaired is finished, ventilating the soil in the repairing cylinder from a gas fluidization distributor of a gas inlet, and enabling the soil to reach a microfluidization state so as to accelerate the desorption of pollutants, wherein in the soil repairing process, an exhaust port is opened and tail water of tail gas is treated;
the specific process of the leaching method for repairing the heavy metal contaminated soil mode comprises the following steps:
(a) Feeding: starting the stirring paddle to a set rotating speed, and adding the soil to be restored into the restoration cylinder from the solid feeding hole;
(b) Stirring and leaching: after the soil feeding is finished, spraying and feeding leacheate into the repairing cylinder from the liquid medicament storage tank until a set liquid-solid ratio is reached to obtain a slurry solid-liquid mixture and continuously stirring;
(c) Solid-liquid separation and discharging: and after stirring and leaching are completed, discharging the slurry solid-liquid mixture, and performing solid-liquid separation to obtain the restored soil.
9. The multifunctional multi-mode integrated soil ex-situ remediation method of claim 8, wherein the modes of remediating contaminated soil by a medicament method, remediating organic contaminated soil by thermal desorption matching vapor extraction, and remediating heavy metal contaminated soil by elution method can be coupled with each other to form a coupling strengthening remediation mode, and the coupling strengthening remediation mode comprises a medicament remediation strengthening coupling mode and a elution remediation heavy metal strengthening coupling mode.
10. The multifunctional multi-mode integrated soil ex-situ remediation method of claim 9, wherein the agent remediation strengthening coupling mode is:
feeding a solid medicament: starting a stirring paddle to a set rotating speed, and then adding a solid curing stabilizing agent or an oxidation reduction agent in a solid agent storage tank and soil to be repaired into a repairing cylinder from a solid feeding hole;
feeding water-phase medicaments: at the same time of feeding the solid medicament, spraying and feeding the curing stabilizing medicament or the oxidation reduction medicament of the water phase into the repairing cylinder from the liquid medicament storage tank;
after the solid medicament and the water-phase medicament are fed, continuously ventilating the soil in the repairing cylinder from the gas fluidization distributor at the gas inlet, and enabling the soil to reach a micro-fluidization state so as to strengthen the soil repairing effect;
the leaching repair reinforced coupling mode is as follows:
starting the stirring paddle to a set rotating speed, and adding the soil to be restored into the restoration cylinder from the solid feeding hole;
after the soil feeding is finished, spraying and feeding leacheate into the repairing cylinder from the liquid medicament storage tank until a set liquid-solid ratio is reached to obtain a slurry solid-liquid mixture and continuously stirring;
then, the gas fluidization distributor at the gas inlet is used for ventilating the soil in the repairing cylinder, and the slurry solid-liquid mixture is aerated, so that the soil repairing effect is enhanced.
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