CN108971215A - The heavy-metal contaminated soil restorative procedure filtered based on ultrasound - Google Patents
The heavy-metal contaminated soil restorative procedure filtered based on ultrasound Download PDFInfo
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- CN108971215A CN108971215A CN201810595297.9A CN201810595297A CN108971215A CN 108971215 A CN108971215 A CN 108971215A CN 201810595297 A CN201810595297 A CN 201810595297A CN 108971215 A CN108971215 A CN 108971215A
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- soil
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- acid
- ultrasound
- heavy metal
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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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
A kind of heavy-metal contaminated soil restorative procedure filtered based on ultrasound, the sprinkling of organic multicomponent acid is carried out to soil to be processed first or is impregnated to realize that multivalent state heavy metal ion is dissociated, then carrying out ultrasonication by needle-type ultrasound tamping equipment makes upper soll layer form continuous water-filling phase, and the aqueous solution of heavy metal is included finally by vacuum pad rapid filtration under suction recycling soil aperture.Chemical characteristic of the present invention according to polluted heavy metals in soil, using targetedly organic multicomponent acid soak, have the characteristics that the improvement period is short, removal efficiency of heavy metals is high, Environment Ecological Safe is high, can be widely used for the improvement and reparation of all kinds of heavy-metal contaminated soils.
Description
Technical field
The present invention relates to a kind of technologies in soil remediation field, and in particular to a kind of heavy metal pollution filtered based on ultrasound
Soil remediation method.
Background technique
Heavy-metal contaminated soil Treatment process includes physics, chemistry and biological method, and there are pollutant removals for these methods
Many defects such as low efficiency, at high cost, period length, or even soil can not still continue to cultivate after improvement.It is electronic such as physical method
It repairs, in order to improve transport efficiency of the heavy metal ion in soil porous media, needs to be greatly reduced the pH value of the soil liquid
And apply lasting consistent electric field to soil, higher cost and take a long time；Chemical fastening techniques are that soil conditioner is added
Change soil physics, chemical property, by absorption, precipitating or the co-precipitation to heavy metal, changes heavy metal in the soil
Existence, to reduce its bioavailability, fixed efficiency is poor, and still may be in crop in cultivation process
Lasting accumulation；Plant extraction technology be by planting some heavy metal super-enriched plants, will be in contaminated soil using its root system
Heavy metal accumulation removes Heavy Metals in Contaminated Soils to aboveground vegetation part, and and periodically gathering in, there are bioaccumulation efficiency
Under, administer the period it is longer the defects of.
Summary of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of heavy-metal contaminated soil reparation sides filtered based on ultrasound
Method, according to the chemical characteristic of polluted heavy metals in soil, using targetedly organic multicomponent acid soak, then with ultrasonic treatment+
The method that vacuum filtration realizes removal of heavy metal ions, with administering, the period is short, removal efficiency of heavy metals is high, Environment Ecological Safe
The features such as property is high, can be widely used for the improvement and reparation of all kinds of heavy-metal contaminated soils.
The present invention is achieved by the following technical solutions:
The present invention carries out the sprinkling of organic multicomponent acid to soil to be processed first or impregnates to realize multivalent state heavy metal ion
It is free, then make upper soll layer form continuous water-filling phase by needle-type ultrasound tamping equipment progress ultrasonication, most
The aqueous solution that soil aperture includes heavy metal is recycled by vacuum pad rapid filtration under suction afterwards.
The immersion refers to: for the chemical characteristic of polluted heavy metals in soil, using effective component for amino carboxylic acid
The composite organic acid of class, hydroxycarboxylic acid or hydroxylamino carboxylic acid quasi-chelate compound impregnates, by organic multicomponent acid to heavy metal ion
Elution complexing realize the free of multivalent state heavy metal ion.
The organic multicomponent acid includes: disodium ethylene diamine tetraacetate, diethylene triamine pentacetic acid (DTPA), ammonium citrate or its group
It closes.
The organic multicomponent acid is preferably are as follows: is directed to Pb and Zn contaminated soil, uses molar ratio for the ethylenediamine tetraacetic of 1:3
The mixed solution of acetic acid disodium and ammonium citrate uses molar ratio for the diethylenetriamine of 1:5 for Cd and Cr contaminated soil
The mixed solution of pentaacetic acid and ammonium citrate.
The immersion, the organic multicomponent acid that compounding is added after preferably water logging 12-48h continue to impregnate 6-24h.
The ultrasonication, preferably first passes through and turns over processing, that is, uses but be not limited to sickle type Cultivator, to sprinkling
Or the upper soll layer after impregnating is turned over.
The ultrasonication drives needle-type ultrasound tamping equipment to carry out ultrasonic vibration to upper soll layer by Cultivator
Smash processing 2h.
The topsoil, depth 10-30cm.
The vacuum pad rapid filtration under suction refers to: the covering vacuum pad in continuous water-filling phase, using vacuum hydro-exhaustion machine to dirt
It contaminates region and realizes that continuous vacuum filters, extract the aqueous solution that soil aperture includes heavy metal, realize a huge sum of money in polluted soil
The disengaging of category.
The recycling refers to: forming and is added according to heavy metal type after the soil liquid after extraction is collected by tank car
The compounding organic multicomponent acid added adds corresponding chemical precipitation agent such as lime, vulcanizing agent, molysite etc. respectively and realizes the heavy of heavy metal
It forms sediment and separates.Technical effect
Compared with prior art, the present invention is based on the system researches that heavy metal deposits figuration state in the soil, propose with polynary
Organic acid+ultrasonic treatment realizes efficiently separating for heavy metal and soil particle, and the technology that continuously filters in conjunction with vacuum realizes that soil is molten
The continuous suction filtration of liquid is with the chemical precipitation processing of smoke filtrate, it can be achieved that the rapidly and efficiently reparation of heavy-metal contaminated soil, medicament are residual
Taking a photograph, it is small and low to soil composition damage to ring.
Detailed description of the invention
Fig. 1 is needle-type ultrasound tamping equipment composition of the present invention；
In figure: A is needle-type ultrasound tamping equipment side view, and B is the axonometric drawing of the ultrasonic needle roller that vibrates；
In figure: energy converter 1, amplitude transformer 2, roller bearing 3, needle roller 4, filter cloth 5, flexible pressure pad 6, aluminium alloy buckle side 7.
Fig. 2 is that vacuum dehydration of the present invention pads composition.
Specific embodiment
Embodiment 1
The present embodiment near the Pb-Zn deposits of Hunan by a piece of terraced fields of weathering slag leachate contamination to be tested, soil
Earth is sticky red soil, and pH meta-alkalescence is 7.62, and the content of organic matter is relatively low, only 4.8g/kg, and conductivity is obviously higher, about
1140μS/m；The total concentration mean value of Pb and Zn is respectively 1624mg/kg and 2287mg/kg, mainly deposits figuration state such as following table institute
Show.
The present embodiment specific steps include:
It is then 1:3's by molar ratio 1. being turned over and being filled the water using surface layer Cultivator after clearing up ground flora and impregnate 48h
Disodium ethylene diamine tetraacetate and ammonium citrate, which are uniformly dissolved, is sprayed onto contaminated land surface layer；
2. driving needle-type ultrasound tamping equipment to carry out ultrasound to topsoil and vibrate to handle 2h with Cultivator after impregnating 6h；
As shown in Figure 1, the needle-type ultrasound tamping equipment includes: that amplitude transformer 2 and several groups are rotatably dispose in it
On roller bearing 3, energy converter 1 and needle roller 4, in which: energy converter 1 is set to the inside of roller bearing 3 and is connected with high frequency electric source, and needle roller 4 is consolidated
Surely it is set to outside roller bearing 3, the machinery with electric current identical frequency is generated by the energy converter 1 that high-frequency alternating current keeps roller bearing 3 embedded
Vibration, and amplitude is transmitted to needle roller 4 fixed on roller bearing 3 by amplitude transformer 2, to make needle roller 4 that ultrasonic vibration occur.
The needle roller length is 15cm, horizontal spacing 15cm.
3. then with 4 × 6m2Vacuum pad mulching soil and connecting opens vacuum hydro-exhaustion machine after tank car and is filtered that (single width is taken out
Filter 0.5h), 0.8kg/m in mass ratio after the soil liquid collected in tank car is stood3Lime complexing agent, which is added, keeps chelating agent de-
Steady precipitating recycling heavy metal.
As shown in Fig. 2, the vacuum pad includes: the filter cloth 5 being mutually in contact with continuous water-filling, is set on filter cloth 5
Flexible pressure pad 6 and the aluminium alloy for being set to 6 surrounding of filter cloth 5 and flexible pressure pad buckle side 7, and flexible pressure pad 6 is equipped with true for connecting
The channel of sky pump is covered in continuous water-filling phase by filter cloth 5 and by the temporarily isolating overlay area pulp in aluminium alloy button side 7 soil
Earth, so that the continuous suction filtration for vacuum pump provides the soil horizon of opposing seal.
After the above method is handled, the total concentration mean value of P in soil b and Zn are respectively 219mg/kg and 193mg/ in terraced fields
Kg reaches GB15618-1995 secondary standard, and bioavailability is greatly reduced.
Embodiment 2
The present embodiment is tested with the width arable land of Guangdong industrial wastewater pollution, and soil is sticky brown earth, and pH is inclined
Faintly acid is 6.45, and it is 12.7g/kg that the content of organic matter is normal, and conductivity is higher, about 820 μ S/m；Polluted heavy metals Cd
Total concentration mean value with Cr is respectively 470 μ g/kg and 191.5mg/kg, and it is as shown in the table mainly to deposit figuration state.
The present embodiment specific steps include:
1. water filling is impregnated for 24 hours after harvesting cultivation crop, then turns over surface layer 20cm soil using surface layer Cultivator and be crushed；
Contaminated land surface layer is sprayed into being uniformly dissolved the diethylene triamine pentacetic acid (DTPA) that molar ratio is 1:5 with ammonium citrate；
2. with Cultivator drive needle-type ultrasound tamping equipment (needle roller long 20cm, horizontal spacing 20cm) to topsoil into
Row ultrasound, which is vibrated, handles 3h；
3. with 4 × 6m2Vacuum pad mulching soil and connecting opens vacuum hydro-exhaustion machine after tank car and is filtered that (single width filters
1h), 1.2kg/m in mass ratio after the soil liquid collected in tank car being stood3Lime, which is added, makes the de- steady precipitating of chelating agent to return
Receive heavy metal.
The total concentration mean value of the Cd and Cr of soil are respectively 241 μ g/kg and 67mg/kg after the above method is handled, substantially
Reach GB15618-1995 secondary standard, and bioavailability is greatly reduced.
Above-mentioned specific implementation can by those skilled in the art under the premise of without departing substantially from the principle of the invention and objective with difference
Mode carry out local directed complete set to it, protection scope of the present invention is subject to claims and not by above-mentioned specific implementation institute
Limit, each implementation within its scope is by the constraint of the present invention.
Claims (10)
1. it is a kind of based on ultrasound filter heavy-metal contaminated soil restorative procedure, which is characterized in that first to soil to be processed into
The sprinkling of row organic multicomponent acid is impregnated to realize the free of multivalent state heavy metal ion, and needle-type ultrasound tamping equipment is then passed through
Carrying out ultrasonication makes upper soll layer form continuous water-filling phase, finally by vacuum pad rapid filtration under suction recycling soil aperture
Aqueous solution containing heavy metal.
2. according to the method described in claim 1, it is characterized in that, the immersion refers to: for polluted heavy metals in soil
Chemical characteristic uses effective component for the composite organic acid of aminocarboxylic acids, hydroxycarboxylic acid or hydroxylamino carboxylic acid quasi-chelate compound
It impregnates, the free of multivalent state heavy metal ion is realized by elution complexing of the organic multicomponent acid to heavy metal ion.
3. method according to claim 1 or 2, characterized in that the organic multicomponent acid includes: ethylenediamine tetra-acetic acid two
Sodium, diethylene triamine pentacetic acid (DTPA), ammonium citrate or combinations thereof.
4. method according to claim 1 or 2, characterized in that the organic multicomponent acid are as follows: polluted for Pb and Zn
Soil uses molar ratio for the mixed solution of the disodium ethylene diamine tetraacetate of 1:3 and ammonium citrate, the soil polluted for Cd and Cr
Earth uses molar ratio for the mixed solution of the diethylene triamine pentacetic acid (DTPA) of 1:5 and ammonium citrate.
5. according to the method described in claim 1, it is characterized in that, compounding is added after preparatory water logging 12-48h for the immersion
Organic multicomponent acid continues to impregnate 6-24h.
6. according to the method described in claim 1, it is characterized in that, the ultrasonication first passes through turn over processing in advance, that is, adopts
With sickle type Cultivator, the upper soll layer after immersion is turned over.
7. method according to claim 1 or 6, characterized in that the ultrasonication drives needle roller by Cultivator
Formula ultrasound tamping equipment, which vibrates to upper soll layer progress ultrasound, handles 2h.
8. method described according to claim 1 or 6 or 7, characterized in that the needle-type ultrasound tamping equipment includes: to become
Width bar and several groups are rotatably dispose in roller bearing, energy converter and needle roller thereon, in which: energy converter be set to inside roller bearing and with
High frequency electric source is connected, and needle roller is fixedly installed on outside roller bearing, is generated and electricity by the energy converter that high-frequency alternating current keeps roller bearing embedded
The mechanical oscillation of identical frequency are flowed, and amplitude are transmitted to needle roller fixed on roller bearing by amplitude transformer, to make needle roller
Ultrasonic vibration.
9. according to the method described in claim 1, it is characterized in that, the vacuum pad rapid filtration under suction refers to: in continuous water-filling phase
Upper covering vacuum pad realizes that continuous vacuum filters to Polluted area using vacuum hydro-exhaustion machine, extracts soil aperture and include a huge sum of money
The aqueous solution of category realizes the disengaging of heavy metal in polluted soil.
10. according to claim 1 or method described in 9, characterized in that the vacuum pad includes: to connect with continuous water-filling
The filter cloth of touching, the flexible pressure pad being set on filter cloth and it is set to filter cloth and the aluminium alloy of flexible pressure pad surrounding buckles side, flexibility pressure
Pad is equipped with channel for connecting vacuum pump, by filter cloth be covered in continuous water-filling phase and by aluminium alloy button side it is temporarily isolating
Overlay area pulp soil, so that the continuous suction filtration for vacuum pump provides the soil horizon of opposing seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810595297.9A CN108971215B (en) | 2018-06-11 | 2018-06-11 | Heavy metal contaminated soil remediation method based on ultrasonic suction filtration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810595297.9A CN108971215B (en) | 2018-06-11 | 2018-06-11 | Heavy metal contaminated soil remediation method based on ultrasonic suction filtration |
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| CN108971215A true CN108971215A (en) | 2018-12-11 |
| CN108971215B CN108971215B (en) | 2020-07-24 |
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Citations (5)
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|---|---|---|---|---|
| JP2004066129A (en) * | 2002-08-07 | 2004-03-04 | National Institute Of Advanced Industrial & Technology | Method of restoring soil polluted with heavy metal |
| KR20090127550A (en) * | 2008-06-09 | 2009-12-14 | 한국해양대학교 산학협력단 | Method for heavy metal immobilization using phosphate and ultrasound |
| CN103852359A (en) * | 2014-03-04 | 2014-06-11 | 中国农业大学 | Method for extracting soil heavy metal ion |
| CN104607452A (en) * | 2015-01-21 | 2015-05-13 | 浙江农林大学 | Method for ultrasonically repairing heavy metal contaminated soil |
| CN204747063U (en) * | 2015-04-14 | 2015-11-11 | 桑德环境资源股份有限公司 | Drip washing repair system is reinforceed to heavy metal chromium -contaminated soil's supersound |
-
2018
- 2018-06-11 CN CN201810595297.9A patent/CN108971215B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004066129A (en) * | 2002-08-07 | 2004-03-04 | National Institute Of Advanced Industrial & Technology | Method of restoring soil polluted with heavy metal |
| KR20090127550A (en) * | 2008-06-09 | 2009-12-14 | 한국해양대학교 산학협력단 | Method for heavy metal immobilization using phosphate and ultrasound |
| CN103852359A (en) * | 2014-03-04 | 2014-06-11 | 中国农业大学 | Method for extracting soil heavy metal ion |
| CN104607452A (en) * | 2015-01-21 | 2015-05-13 | 浙江农林大学 | Method for ultrasonically repairing heavy metal contaminated soil |
| CN204747063U (en) * | 2015-04-14 | 2015-11-11 | 桑德环境资源股份有限公司 | Drip washing repair system is reinforceed to heavy metal chromium -contaminated soil's supersound |
Non-Patent Citations (1)
| Title |
|---|
| 吴阳东等: "超声波辅助浸取分离污泥中的重金属", 《环境科学与技术》 * |
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