CN204974702U - Chromium -contaminated soil dystopy drip washing prosthetic devices - Google Patents
Chromium -contaminated soil dystopy drip washing prosthetic devices Download PDFInfo
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- CN204974702U CN204974702U CN201520566384.3U CN201520566384U CN204974702U CN 204974702 U CN204974702 U CN 204974702U CN 201520566384 U CN201520566384 U CN 201520566384U CN 204974702 U CN204974702 U CN 204974702U
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Abstract
The utility model belongs to the technical field of it administers to pollute the soil restoration, in particular to heavy metal (hexavalent chromium) pollutes the dystopy chemistry drip washing prosthetic devices of soil. Sexavalence chromium -contaminated soil dystopy drip washing prosthetic devices cleans the unit including the one -level: pulping machine, mixing homogenization equipment, one -level shale shaker, one -level swirler, the unit is cleaned to the second grade: intense agitation machine, two - stage swirler, second grade shale shaker, the liquid water disposal unit: the concentrator, wait to press mud tank and filter press, the medicament adds the unit: chemicals tank. Adopt the utility model discloses dystopy drip washing prosthetic devices carries out dystopy drip washing restoration to chromium -contaminated soil, and cr6+'s clearance can arrive more than 85% in the soil, the utility model discloses dystopy drip washing prosthetic devices can move in a flexible way, and portable extremely next engineering scene reuses after the engineering, consequently can effectively practice thrift cost, improve equipment utilization ratio.
Description
Technical field
The utility model belongs to contaminated soil remediation Treatment process field, particularly the ex-situ chemical washing prosthetic device of heavy metal (Cr VI) contaminated soil.
Background technology
Cr pollutes the waste water, the waste residue that are mainly derived from plating, process hides, chemical industry and metallurgy industry.Cr is mainly with Cr
3+and Cr
6+two kinds of valence states exist, Cr
3+toxicity is lower, not soluble in water, is the required trace element of human body and growth of animal; Cr
6+toxicity ratio Cr
3+exceed hundreds of times, easily enter human body cell, cause damage to the internal organs such as liver, kidney and DNA, having carcinogenicity and may suddenly change by modificator gene, is harmful industrial hazardous waste.In addition, Cr
6+very easily water-soluble, there is high animal migration, in soil, lateral transfer will expand pollution range, and vertical migration increases the earth volume of contaminated soil, strengthen the difficulty of repairing, and the pollution to underground water can be caused further, be classified as priority pollutant by U.S. EPA.Chromium is because of its high toxicity and carcinogenicity, and soil Cr is polluted becomes the most serious environmental problem.
The chromium generally adopted both at home and abroad at present and the restorative procedure of other heavy-metal contaminated soils comprise peripheral doses, chemical redemption and bioremediation technology.Wherein, peripheral doses is applicable to the heavy but situation that pollution range is little of the light or pollution level of pollution level, and the technology engineering time is shorter, but fund input is large, and mainly by pollutant transfer or fixing, does not really remove pollutant; Biotechnology utilizes the vital metabolic of microorganism or plant movable, and feature is safe and reliable, and secondary pollution is few, but repairing efficiency factory, the impact by environmental factors such as soil types, geological conditions, weathers is large; Chemical redemption is by adding curing agent, organic matter, chemical agent etc. in soil, by absorption, redox, antagonism, complexing chelating or precipitation, to reduce the biological effectiveness of heavy metal, mainly comprising elution technique, curing/stabilizing technology.
Drip washing recovery technique is divided into based technique for in-situ remediation and showering technology.Original position drip washing applies leacheate in soil, leacheate reacts with Cr in soil in the process of infiltration downwards, by effects such as dissolving, desorb, complexings, Cr forms migration state material and flows out with leacheate, carries out follow-up water treatment after entering wastewater collection well.Dystopy drip washing is dug out by contaminated soil, and adds leacheate and clean soil, finally contaminant water is carried out subsequent treatment in corresponding equipment, the method for clean earthen backfill.
Summary of the invention
The utility model is for the deficiencies in the prior art, and object is to provide a kind of chromium-polluted soil dystopy drip washing prosthetic device.
For achieving the above object, the technical scheme that the utility model adopts is:
A kind of chromium-polluted soil dystopy drip washing prosthetic device, is characterized in that, comprise
One-level scrubbing unit, it comprises pulper, mixing homogenization installation, primary vibration sieve and one-level cyclone, and described pulper, mixing homogenization installation are connected in turn with primary vibration sieve, exports and be connected with one-level cyclone under the sieve of described primary vibration sieve;
Secondary scrubbing unit, it comprises machine,massing, second cyclone and secondary vibration sieve, the underflow outlet of described one-level cyclone is connected with described machine,massing, machine,massing is connected with second cyclone, the underflow outlet of second cyclone is sieved with secondary vibration and is connected, export under the sieve of secondary vibration sieve and be again connected with second cyclone entrance, carry out second cyclone-vibratory sieve iterative cycles process;
Waste disposal unit, it comprises concentrator, treats pressure slurry tank and plate and frame filter press, the overflow outlet of the overflow outlet of described one-level cyclone, second cyclone is connected with concentrator respectively, described concentrator outlet at bottom with wait to press slurry tank to be connected, wait to press slurry tank to be connected with plate and frame filter press;
Medicament adding device, it comprises pharmacy jar, and described pharmacy jar is connected with mixing homogenization installation, machine,massing respectively.
In such scheme, described mixing homogenization installation is horizontal type drum, and during work, drum rotates about the axis.
In such scheme, described machine,massing comprises housing and vertical agitator, described vertical agitator comprises three layers of stirring vane assembly on shaft and fixing shaft, described every layer of stirring vane assembly comprises multiple equally distributed, blade with same tilt direction and same tilt angle, the incline direction of adjacent two layers stirring vane assembly blade is contrary.
In such scheme, the cross section of described housing is regular hexagon, described vertical agitator comprises three layers of stirring vane assembly of shaft and fixing shaft end, described every layer of stirring vane assembly comprises 6 equally distributed, to have same tilt direction and same tilt angle blades, blade between layers aligns in vertical direction.
In such scheme, the screen size of described primary vibration sieve is 5mm, described secondary vibration sieve screen size be 0.1mm.
In such scheme, the particle separation diameter of described one-level cyclone, second cyclone is 75 μm.
In such scheme, described all connections are pipeline and connect, and described pipeline is provided with control valve; Further, described control valve can realize PLC control.
In the utility model, described machine,massing adopts firm, wear-resisting, and easy care steel/stainless steel is prepared from, and agitator is multiple layers of vanes assembly, can form the contrary vortex in direction in whipping process; Further, the cross section of described strong stirring engine housing adopts regular hexagon moulding, effectively can increase collision probability and the intensity of mud particle and chamber wall, makes pollutant or fines are easier removes from large particle surface; Meanwhile, the collision between particle, between particle and chamber wall, friction make the temperature of soil slurries raise, and can accelerate the carrying out of drip washing reaction.
Adopt above-mentioned chromium-polluted soil dystopy drip washing prosthetic device chromium-polluted soil to be carried out to the technique of dystopy drip washing reparation, comprise the steps:
(1) one-level drip washing: be made into slurries after contaminated soil adds water in pulper, then mixing homogenization installation is pumped to, in mixing homogenization installation, add drip washing medicament simultaneously, open mixing homogenization installation and carry out first time drip washing, after drip washing terminates, slurries are pumped to primary vibration sieve compass screen surface, oversize is discharged as bulky grain clean earth after flushing water rinses, the lower slurries of sieve are pumped to one-level cyclone and are separated further, after one-level cyclone is separated, wherein fine grained suspension enters follow-up concentrator with overflow type and carries out liquid waste processing, underflow material enters next stage drip washing,
(2) two-step washing: underflow substance pump is delivered to machine,massing, in machine,massing, add drip washing medicament simultaneously, open machine,massing and carry out second time drip washing, after drip washing terminates, underflow material is pumped to second cyclone and is separated further, after second cyclone is separated, wherein fine grained suspension enters follow-up concentrator with overflow type and carries out liquid waste processing, underflow material is pumped to secondary vibration sieve compass screen surface and carries out regrading, oversize is discharged as clean earth after flushing water rinses, the lower slurries of sieve enter second cyclone again, carry out second cyclone-secondary vibration sieve iterative cycles process,
(3) liquid waste processing: add reducing agent, flocculant and pH adjusting agent in concentrator, abundant stirring, leave standstill after, fine grained suspension is flocculated precipitation and forms the underflow beds of precipitation and supernatant, the underflow beds of precipitation enter to be waited to press slurry tank, to treating to add curing agent in pressure slurry tank, entering plate and frame filter press press filtration subsequently and forming filter cake and filtrate.
In such scheme, the supernatant in described concentrator and the filtrate in plate and frame filter press can be used as rinse water reuse or discharge after doing process up to standard, and described filter cake can be used as general solid waste process.
In such scheme, the time of described first time drip washing is 30 ~ 60 minutes, and the time of second time drip washing is 30 ~ 60 minutes.
In such scheme, described drip washing medicament is ferrous sulfate (FeSO
4), the drip washing additive amount of medicament of twice drip washing is respectively 60g/kg soil, 30g/kg soil.
In such scheme, described pH adjusting agent is calcium hydroxide, and described reducing agent is ferrous sulfate, and described flocculant is PAM, and described curing agent is HAS soil-repairing agent.
In such scheme, the solid concentration of described slurries is 500g/L ~ 600g/L.
The beneficial effects of the utility model are: after (1) adopts the utility model chromium-polluted soil dystopy drip washing prosthetic device to carry out dystopy drip washing reparation to chromium-polluted soil, Cr in soil
6+clearance can to more than 85%, Cr in dense supernatant and press filtration filtrate
6+content is very low, and basic inspection does not measure, and can reflux and recycle as rinse water or discharge after doing process up to standard, filter cake can be used as general solid waste process; (2) dystopy drip washing prosthetic device described in the utility model can be moved as the case may be flexibly; Dystopy elution device is movable to next engineering site and reuses after engineering terminates, and therefore effectively can improve utilization rate of equipment and installations, cost-saving; (3) by adjustment drip washing medicament, the utility model dystopy drip washing prosthetic device also may be used for the drip washing of other heavy-metal contaminated soils, and effectively can reduce the content of Heavy Metals in Contaminated Soils.
Accompanying drawing explanation
Fig. 1 is the utility model dystopy drip washing prosthetic device schematic diagram, in figure, 1 represents pulper, and 2 represent pharmacy jar, 3 representative mixing homogenization installations, 4 represent primary vibration sieve, 5 represent one-level cyclone, and 6 represent machine,massing, and 7 represent second cyclone, 8 represent secondary vibration sieve, 9 represent concentrator, 10 represent wait press slurry tank, 11 represent plate and frame filter press.
Fig. 2 the utility model dystopy drip washing renovation technique schematic diagram.
Fig. 3 is the sketch of machine,massing, and wherein 1 is top view, and 2 is front view.
Detailed description of the invention
In order to understand the utility model better, illustrate content of the present utility model further below in conjunction with embodiment, but content of the present utility model is not only confined to the following examples.
See Fig. 1, a kind of chromium-polluted soil dystopy drip washing prosthetic device, comprises
One-level scrubbing unit, it comprises pulper 1, mixing homogenization installation 3, primary vibration sieve 4, one-level cyclone 5, described pulper 1, mixing homogenization installation 3 are connected in turn with primary vibration sieve 4, export and be connected with one-level cyclone 5 entrance under the sieve of described primary vibration sieve 4;
Secondary scrubbing unit, it comprises machine,massing 6, second cyclone 7, secondary vibration sieve 8, the underflow outlet of described one-level cyclone 5 is connected with described machine,massing 6, machine,massing 6 is connected with second cyclone 7 entrance, the underflow outlet of second cyclone 7 is sieved 8 with secondary vibration and is connected, and exports and be again connected with second cyclone 7 entrance under the sieve of secondary vibration sieve 8;
Waste disposal unit, it comprises concentrator 9, treats pressure slurry tank 10 and plate and frame filter press 11, the overflow outlet of described one-level cyclone 5, the overflow outlet of second cyclone 7 are connected with concentrator 8 respectively, the outlet at bottom of described concentrator 9 with wait to press slurry tank 10 to be connected, treat that pressure slurry tank 10 is connected with plate and frame filter press 11;
Medicament adding device, it comprises pharmacy jar 2, and described pharmacy jar 2 is connected with mixing homogenization installation 3, machine,massing 6 respectively.
In such scheme, described mixing homogenization installation is horizontal type drum, and during work, drum rotates about the axis.
In such scheme, described machine,massing comprises housing and vertical agitator, described vertical agitator comprises three layers of stirring vane assembly on shaft and fixing shaft, described every layer of stirring vane assembly comprises multiple equally distributed, blade with same tilt direction and same tilt angle, the incline direction of adjacent two layers stirring vane assembly blade is contrary.
Further, see Fig. 3, the cross section of described housing is regular hexagon, described vertical agitator comprises three layers of stirring vane assembly of shaft and fixing shaft end, described every layer of stirring vane assembly comprises 6 equally distributed, to have same tilt direction, same tilt angle blades, blade between layers aligns in vertical direction.
Machine,massing described in the utility model adopts firm, wear-resisting, and easy care steel/stainless steel is prepared from, and agitator is multiple layers of vanes assembly, can form the contrary vortex in direction in whipping process; Further, the cross section of described strong stirring engine housing adopts regular hexagon moulding, effectively can increase collision probability and the intensity of mud particle and chamber wall, makes pollutant or fines are easier removes from large particle surface; Meanwhile, the collision between particle, between particle and chamber wall, friction make the temperature of soil slurries raise, and can accelerate the carrying out of drip washing reaction.
In such scheme, the screen size of described primary vibration sieve is 5mm, described secondary vibration sieve screen size be 0.1mm.
In such scheme, the particle separation diameter of described one-level cyclone, second cyclone is 75 μm.
In such scheme, described all connections are pipeline and connect, and described pipeline is provided with control valve; Further, described control valve can realize PLC control.
Embodiment 1
Contaminated soil is taken from certain chemical plant and is discarded factory site, moisture content about 25%, adopts above-mentioned chromium-polluted soil dystopy drip washing prosthetic device to carry out drip washing reparation, comprises the steps:
(1) one-level drip washing: be made into the slurries that solid concentration is 500g/L after contaminated soil adds water in pulper, be then pumped to mixing homogenization installation, adds the drip washing medicament ferrous sulfate (FeSO of 60g/kg soil simultaneously in mixing homogenization installation
4), open mixing homogenization installation and carry out first time drip washing, the drip washing time is 40min, after drip washing terminates, slurries are pumped to the compass screen surface screening of primary vibration sieve and rinse with a certain amount of flushing water, lengthwise movement is done under the exciting force effect that compass screen surface produces at motor, large granular materials on compass screen surface is tossed on screen cloth, simultaneously moving linearly forward, the bulky grain stone of more than 5mm falls from one end of screen cloth thus is sized out discharges as clean earth, fine grained slurries are pumped to one-level cyclone (particle separation diameter is 75 μm) through screen cloth gap as the lower slurries of sieve and are separated further, after one-level cyclone is separated, wherein fine grained suspension (particle diameter is less than 75 μm) enters follow-up concentrator with overflow type and carries out liquid waste processing, underflow material enters next stage drip washing,
(2) two-step washing: underflow substance pump is delivered to machine,massing, in machine,massing, add 30g/kg soil drip washing medicament simultaneously, open machine,massing and carry out second time drip washing, the drip washing time is 40min, after drip washing terminates, underflow material is pumped to second cyclone (particle separation diameter is 75 μm) and is separated further, after second cyclone is separated, wherein fine grained suspension (particle diameter is less than 75 μm) enters follow-up concentrator with overflow type and carries out liquid waste processing, underflow material is pumped to secondary vibration sieve compass screen surface and carries out regrading, Sieving and casing 0.1mm, oversize is discharged as clean earth after flushing water rinses, the lower slurries of sieve enter second cyclone again, carry out second cyclone-secondary vibration sieve iterative cycles process,
(3) liquid waste processing: add reducing agent ferrous sulfate, flocculant PAM and pH adjusting agent calcium hydroxide and carry out Cr in concentrator
6+reduction and the precipitation of part metals ion, abundant stirring, leave standstill after, form the underflow beds of precipitation and supernatant, the underflow beds of precipitation enter to be waited to press slurry tank, to treating to add stabilizer HAS soil-repairing agent in pressure slurry tank, enter plate and frame filter press press filtration subsequently and form filter cake as general offal treatment, concentrator supernatant is the reuse of backflow effect rinse water together with filter press filtrate.
The utility model contaminated soil after drip washing repair process, Cr in soil
6+clearance 85%, Cr in dense supernatant and press filtration filtrate
6+content is very low, and basic inspection does not measure, and can be used as rinse water reuse or discharge after doing process up to standard, filter cake can be used as general solid waste process.
Embodiment 2
Contaminated soil is taken from certain machinery plant's electroplating workshop and is discarded factory site, moisture content about 30%, adopts above-mentioned chromium-polluted soil dystopy drip washing prosthetic device to carry out drip washing reparation, comprises the steps:
(1) one-level drip washing: be made into the slurries that solid concentration is 600g/L after contaminated soil adds water in pulper, be then pumped to mixing homogenization installation, adds the drip washing medicament ferrous sulfate (FeSO of 40g/kg soil simultaneously in mixing homogenization installation
4), open mixing homogenization installation and carry out first time drip washing, the drip washing time is 30min, after drip washing terminates, slurries are pumped to the compass screen surface screening of primary vibration sieve and rinse with a certain amount of flushing water, lengthwise movement is done under the exciting force effect that compass screen surface produces at motor, large granular materials on compass screen surface is tossed on screen cloth, simultaneously moving linearly forward, the bulky grain stone of more than 5mm falls from one end of screen cloth thus is sized out discharges as clean earth, fine grained slurries are pumped to one-level cyclone (particle separation diameter is 75 μm) through screen cloth gap as the lower slurries of sieve and are separated further, after one-level cyclone is separated, wherein fine grained suspension (particle diameter is less than 75 μm) enters follow-up concentrator with overflow type and carries out liquid waste processing, underflow material enters next stage drip washing,
(2) two-step washing: underflow substance pump is delivered to machine,massing, in machine,massing, add 20g/kg soil drip washing medicament simultaneously, open machine,massing and carry out second time drip washing, the drip washing time is 30min, after drip washing terminates, underflow material is pumped to second cyclone (particle separation diameter is 75 μm) and is separated further, after second cyclone is separated, wherein fine grained suspension (particle diameter is less than 75 μm) enters follow-up concentrator with overflow type and carries out liquid waste processing, underflow material is pumped to secondary vibration sieve compass screen surface and carries out regrading, Sieving and casing 0.1mm, oversize is discharged as clean earth after flushing water rinses, the lower slurries of sieve enter second cyclone again, carry out second cyclone-secondary vibration sieve iterative cycles process,
(3) liquid waste processing: add reducing agent ferrous sulfate, flocculant PAM and pH adjusting agent calcium hydroxide and carry out Cr in concentrator
6+reduction and the precipitation of part metals ion, abundant stirring, leave standstill after, form the underflow beds of precipitation and supernatant, the underflow beds of precipitation enter to be waited to press slurry tank, to treating to add stabilizer HAS soil-repairing agent in pressure slurry tank, enter plate and frame filter press press filtration subsequently and form filter cake as general offal treatment, concentrator supernatant is the reuse of backflow effect rinse water together with filter press filtrate.
After adopting chromium-polluted soil dystopy drip washing prosthetic device described in the utility model to carry out drip washing repair process to contaminated soil, Cr in soil
6+clearance 89%, Cr in dense supernatant and press filtration filtrate
6+content is very low, and basic inspection does not measure, and can be used as rinse water reuse or discharge after doing process up to standard, filter cake can be used as general solid waste process.
Above embodiment shows, chromium-polluted soil dystopy drip washing prosthetic device described in the utility model is adopted to carry out drip washing to contaminated soil, the Cr VI in contaminated soil can be made obviously to reduce, and described dystopy drip washing prosthetic device can be controlled by PLC, realize high-efficiency and continuous and run.Can adjusting process flexibly according to the character of contaminated soil and pollution level, the equipment related in system is all movable to next engineering site and reuses after engineering terminates, to improve utilization rate of equipment and installations.
Obviously, above-described embodiment is only for the example done clearly is described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And therefore amplified apparent change or variation are still within the protection domain of the utility model creation.
Claims (6)
1. a chromium-polluted soil dystopy drip washing prosthetic device, is characterized in that, comprise
One-level scrubbing unit, it comprises pulper, mixing homogenization installation, primary vibration sieve and one-level cyclone, and described pulper, mixing homogenization installation are connected in turn with primary vibration sieve, exports and be connected with one-level cyclone under the sieve of described primary vibration sieve;
Secondary scrubbing unit, it comprises machine,massing, second cyclone and secondary vibration sieve, the underflow outlet of described one-level cyclone is connected with described machine,massing, machine,massing is connected with second cyclone, the underflow outlet of second cyclone is sieved with secondary vibration and is connected, and exports and be again connected with the entrance of second cyclone under the sieve of secondary vibration sieve;
Waste disposal unit, it comprises concentrator, treats pressure slurry tank and plate and frame filter press, the overflow outlet of described one-level cyclone is connected with concentrator with the overflow outlet of second cyclone, described concentrator outlet at bottom with wait to press slurry tank to be connected, treat pressure slurry tank be connected with plate and frame filter press;
Medicament adding device, it comprises pharmacy jar, and described pharmacy jar is connected with mixing homogenization installation, machine,massing respectively.
2. chromium-polluted soil dystopy drip washing prosthetic device according to claim 1, it is characterized in that, described mixing homogenization installation is horizontal type drum, and during work, drum rotates about the axis.
3. chromium-polluted soil dystopy drip washing prosthetic device according to claim 1, it is characterized in that, described machine,massing comprises housing and vertical agitator, described vertical agitator comprises shaft and is fixed on three layers of stirring vane assembly on shaft, described every layer of stirring vane assembly comprises multiple equally distributed, blade with same tilt direction and same tilt angle, the incline direction of adjacent two layers stirring vane assembly blade is contrary.
4. chromium-polluted soil dystopy drip washing prosthetic device according to claim 3, it is characterized in that, the cross section of described housing is regular hexagon, described vertical agitator comprises shaft and is fixed on three layers of stirring vane assembly of shaft end, every layer of stirring vane assembly comprises 6 equally distributed, to have same tilt direction and same tilt angle blades, blade between layers aligns in vertical direction.
5. chromium-polluted soil dystopy drip washing prosthetic device according to claim 1, is characterized in that, the screen size of described primary vibration sieve is 5mm, and the screen size of secondary vibration sieve is 0.1mm.
6. chromium-polluted soil dystopy drip washing prosthetic device according to claim 1, it is characterized in that, the particle separation diameter of described one-level cyclone and second cyclone is 75 μm.
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| CN201520566384.3U CN204974702U (en) | 2015-07-31 | 2015-07-31 | Chromium -contaminated soil dystopy drip washing prosthetic devices |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057340A (en) * | 2015-07-31 | 2015-11-18 | 三川德青科技有限公司 | Chromium-contaminated soil different-position leaching repairing technology and device |
| CN105618281A (en) * | 2016-01-25 | 2016-06-01 | 中山大学 | Sorting method and device for contaminated soil particles with different particle sizes |
| CN111266397A (en) * | 2020-04-13 | 2020-06-12 | 北京中岩大地科技股份有限公司 | Polluted soil treatment system and application method thereof |
| CN112872000A (en) * | 2020-12-28 | 2021-06-01 | 华东理工大学 | Rotational flow field regulation and control method of soil rotational flow reduction treatment process |
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2015
- 2015-07-31 CN CN201520566384.3U patent/CN204974702U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057340A (en) * | 2015-07-31 | 2015-11-18 | 三川德青科技有限公司 | Chromium-contaminated soil different-position leaching repairing technology and device |
| CN105057340B (en) * | 2015-07-31 | 2018-05-22 | 三川德青科技有限公司 | A kind of chromium-polluted soil dystopy elution renovation technique and its device |
| CN105618281A (en) * | 2016-01-25 | 2016-06-01 | 中山大学 | Sorting method and device for contaminated soil particles with different particle sizes |
| CN111266397A (en) * | 2020-04-13 | 2020-06-12 | 北京中岩大地科技股份有限公司 | Polluted soil treatment system and application method thereof |
| CN111266397B (en) * | 2020-04-13 | 2024-03-29 | 北京中岩大地科技股份有限公司 | Polluted soil treatment system and use method thereof |
| CN112872000A (en) * | 2020-12-28 | 2021-06-01 | 华东理工大学 | Rotational flow field regulation and control method of soil rotational flow reduction treatment process |
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