CN104249077B - A kind of leaching repairing method of molybdenum polution soil - Google Patents
A kind of leaching repairing method of molybdenum polution soil Download PDFInfo
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- CN104249077B CN104249077B CN201410527765.0A CN201410527765A CN104249077B CN 104249077 B CN104249077 B CN 104249077B CN 201410527765 A CN201410527765 A CN 201410527765A CN 104249077 B CN104249077 B CN 104249077B
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Abstract
The invention provides a kind of leaching repairing method of molybdenum polution soil, adopt tricresyl phosphate sodium salt as eluent, can either remove the molybdenum of part in soil, can not produce obvious adverse effect to soil fertility again, be a kind of character close friend, the restorative procedure of the molybdenum polution soil drawing materials conveniently, easily implement.
Description
Technical field
The invention belongs to contaminated soil recovery technique field, be specifically related to a kind of leaching repairing method of molybdenum polution soil.
Background technology
Soil pollution is because having strong potential hazard, become the important environmental problem receiving much concern. At soilIn all kinds of polluting, inorganic pollution is a most important class. The national soil that national environmental protection portion and Ministry of Land and Resources issueSurvey of contaminating status communique shows that China's soil pollution type is taking inorganic type as main. Soil inorganic pollution is mainly heavy metal-pollutedDye, traditional heavy metal pollution of soil refers to Cadmium in Soil, lead, arsenic, chromium, mercury, nickel, copper, zinc pollution. But along with soil environment investigationThat launches and study gos deep into, and the harmful element beyond above-mentioned heavy metal also progressively causes people's attention.
Molybdenum is the necessary trace element of organism, and scarce molybdenum can cause its undergrowth, even produce various diseases. Plant lacksMolybdenum shows as poor growth, blade yellow etc. It is growth retardation, depauperation that animal lacks molybdenum main manifestations, fall the symptoms such as hair. PeopleBody lacks molybdenum and there will be nerve degeneration and bring out various diseases. Therefore soil contains appropriate molybdenum and to plant, animal and human's body is allUseful. If but molybdenum too high levels in soil will endanger plant, animal and human's body. There is plant in the molybdenum of high concentrationThe symptoms such as blade chlorisis, yellow, deformity. The too high meeting of molybdenum in feed causes that the diseases such as growth retardation, deformity, internal organ appear in animalBecome. The molybdenum of human body excess intake, can bring out gout, copper deficiency, and intoxicating phenomenon even occurs. Tolerating of China adult molybdenumHigh intake is 350 μ g/d(Chinese Soclety of Nutrition, 2010). Therefore, the same with other heavy metals when Molybdenum in Soils too high levels,Also referred to as soil pollution element, should give reparation. China there is no the environmental quality standards of Molybdenum in Soils content at present. In the world also onlyHave several countries to have corresponding standard, as the repairing standard of Molybdenum in Soils is decided to be 100mg/kg by Holland, France protects Molybdenum in SoilsStandard is decided to be 100mg/kg.
The restorative procedure that soil harmful element pollutes mainly contains plant extraction method, drip washing repairing method, passivation repairing method, moving electricityRepairing method, soil moved in to improve the original method etc., wherein elution method refers to and utilizes eluent (chemical solution) to clean soil, soil harmful element is enteredLeacheate, then leaves the method for soil with leacheate. The advantage of elution method is the harmful element that can remove in soil, therebyReduce the content of soil harmful element. The selection of eluent is the decisive factor of drip washing effect. Eluent select according to being toolHave higher clearance, lower cost, little etc. to the side effect of soil. The eluent of common heavy-metal contaminated soil comprisesAcid solution, aqueous slkali, chelating agent solution, salting liquid and surfactant solution etc. Have not yet to see about molybdenum polution soilThe report of ELUTION METHOD.
Summary of the invention
The object of the present invention is to provide a kind of leaching repairing method of molybdenum polution soil, adopt tricresyl phosphate sodium salt as pouringLotion, can either remove molybdenum partly in soil, can not produce obvious adverse effect to soil fertility again, is a kind of character friendThe restorative procedure of the molybdenum polution soil of drawing materials conveniently well,, easily implement.
For achieving the above object, the present invention adopts following technical scheme:
A kind of leaching repairing method of molybdenum polution soil comprises the following steps:
(1) Na that compound concentration is 0.10mol/L3PO4Solution is as leached soil solutions;
(2) be 5:1 ml/g according to leacheate volume with soil weight ratio, leacheate and molybdenum polution soil are placed in to 50In milliliter centrifuge tube, shake up;
(3) centrifuge tube is placed in to oscillator, at 22-28 DEG C, oscillation rate is 200 revs/min, vibrates 1.5 hours;
(4) again centrifuge tube is placed in to centrifuge, with 3000 revs/min of centrifugations 10 minutes, supernatant inclined;
(5), behind residual soil repeating step (2) again-(4) 2-3 time, the content of Molybdenum in Soil can obviously reduce.
Remarkable advantage of the present invention is:
It is leached soil solutions that the present invention adopts trisodium phosphate aqueous solution, because the pH value of (1) tertiary sodium phosphate saline solution is highReach 12, be conducive to the dissolving of molybdenum in acid ground, its solution product is with molybdate (MoO4 2?) be main; Tricresyl phosphate sodium salt is water-solubleProduct after dissociating in liquid is with phosphate radical (PO4 3-) be main, with a small amount of hydrogen phosphate (HPO4 2-); Phosphate radical can be replaced soilThe molybdate of solid phase surface sticking, is discharged in leacheate it, thereby is removed; (2) phosphate drip washing molybdenum polution soilDominant mechanism is anion exchange effect, can not produce obvious destruction to the basic proterties of soil, can keep wellThe original productivity of soil, this is advantageous particularly for agricultural soil; (3) phosphate is ubiquitous a large amount of nutrition in soilMaterial, therefore adopts phosphate solution to carry out drip washing, can not cause secondary pollution to soil; (4) with low cost, easy operating,Wide adaptability.
The present invention requires Continuous leaching 2-3 time, because 2-3 drip washing of drip washing is higher than the clearance of 1 drip washing, and concrete 2 timesDrip washing or 3 drip washing, should determine according to edaphic condition that (soil that partially glues of quality can be selected drip washing 3 times, all the other Soil leachings 2Inferior), and increase again drip washing number of times (as 4 times, 5 times) although can increase the clearance of molybdenum, the increase of clearance isLimited, there is no need.
Detailed description of the invention
Embodiment 1
A kind of ELUTION METHOD of repairing molybdenum polution soil is:
1. get a kind of molybdenum polution soil (the full molybdenum content of soil is 54.73mg/kg) 5.00g in 50 milliliters of centrifuge tubes,Adding concentration is the Na of 0.10mol/L3PO425 milliliters of solution.
2. centrifuge tube is placed in to parallel oscillation device, at room temperature under (25 ± 3 DEG C) condition, oscillation rate be 200 turn/Minute, vibrate 1.5 hours.
3. the centrifuge tube having vibrated is placed in to centrifuge, with centrifugation under 3000 revs/min of speed 10 minutes, inclinesSupernatant.
4. residual soil adds 25 milliliters of leacheates again, with hand, the soil block of centrifuge tube bottom is shaken loosely, then centrifuge tube is putIn parallel oscillation device, at room temperature under (25 ± 3 DEG C) condition, oscillation rate is 200 revs/min, vibrate 1.5 hours.
5. the centrifuge tube having vibrated is placed in to centrifuge, with centrifugation under 3000 revs/min of speed 10 minutes, inclinesRemove supernatant.
6. residual soil adds 25 milliliters of leacheates again, with hand, the soil block of centrifuge tube bottom is shaken loosely, then centrifuge tube is putIn parallel oscillation device, at room temperature under (25 ± 3 DEG C) condition, oscillation rate is 200 revs/min, vibrate 1.5 hours.
7. the centrifuge tube having vibrated is placed in to centrifuge, with centrifugation under 3000 revs/min of speed 10 minutes, inclinesRemove supernatant.
Result: after 3 drip washing, the clearance of Molybdenum in Soil is 12.93%.
Embodiment 2
A kind of ELUTION METHOD of repairing molybdenum polution soil is:
1. get a kind of molybdenum polution soil (the full molybdenum content of soil is 93.74mg/kg) 5.00g in 50 milliliters of centrifuge tubes,Adding concentration is the Na of 0.10mol/L3PO425 milliliters of solution.
2. centrifuge tube is placed in to parallel oscillation device, at room temperature under (25 ± 3 DEG C) condition, oscillation rate be 200 turn/Minute, vibrate 1.5 hours.
3. the centrifuge tube having vibrated is placed in to centrifuge, with centrifugation under 3000 revs/min of speed 10 minutes, inclinesSupernatant.
4. residual soil adds 25 milliliters of leacheates again, with hand, the soil block of centrifuge tube bottom is shaken loosely, then centrifuge tube is putIn parallel oscillation device, at room temperature under (25 ± 3 DEG C) condition, oscillation rate is 200 revs/min, vibrate 1.5 hours.
5. the centrifuge tube having vibrated is placed in to centrifuge, with centrifugation under 3000 revs/min of speed 10 minutes, inclinesRemove supernatant.
6. residual soil adds 25 milliliters of leacheates again, with hand, the soil block of centrifuge tube bottom is shaken loosely, then centrifuge tube is putIn parallel oscillation device, at room temperature under (25 ± 3 DEG C) condition, oscillation rate is 200 revs/min, vibrate 1.5 hours.
7. the centrifuge tube having vibrated is placed in to centrifuge, with centrifugation under 3000 revs/min of speed 10 minutes, inclinesRemove supernatant.
Result: after 3 drip washing, the clearance of Molybdenum in Soil is 11.12%.
Embodiment 3
A kind of ELUTION METHOD of repairing molybdenum polution soil is:
1. get a kind of molybdenum polution soil (the full molybdenum content of soil is 127.49mg/kg) 5.00g in 50 milliliters of centrifuge tubesIn, adding concentration is the Na of 0.10mol/L3PO425 milliliters of solution.
2. centrifuge tube is placed in to parallel oscillation device, at room temperature under (25 ± 3 DEG C) condition, oscillation rate be 200 turn/Minute, vibrate 1.5 hours.
3. the centrifuge tube having vibrated is placed in to centrifuge, with centrifugation under 3000 revs/min of speed 10 minutes, inclinesSupernatant.
4. residual soil adds 25 milliliters of leacheates again, with hand, the soil block of centrifuge tube bottom is shaken loosely, then centrifuge tube is putIn parallel oscillation device, at room temperature under (25 ± 3 DEG C) condition, oscillation rate is 200 revs/min, vibrate 1.5 hours.
5. the centrifuge tube having vibrated is placed in to centrifuge, with centrifugation under 3000 revs/min of speed 10 minutes, inclinesRemove supernatant.
6. residual soil adds 25 milliliters of leacheates again, with hand, the soil block of centrifuge tube bottom is shaken loosely, then centrifuge tube is putIn parallel oscillation device, at room temperature under (25 ± 3 DEG C) condition, oscillation rate is 200 revs/min, vibrate 1.5 hours.
7. the centrifuge tube having vibrated is placed in to centrifuge, with centrifugation under 3000 revs/min of speed 10 minutes, inclinesRemove supernatant.
Result: after 3 drip washing, the clearance of Molybdenum in Soil is 17.66%.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change withModify, all should belong to covering scope of the present invention.
Claims (1)
1. a leaching repairing method for molybdenum polution soil, is characterized in that: comprise the following steps:
(1) Na that compound concentration is 0.10mol/L3PO4Solution is as leached soil solutions;
(2) be 5:1 ml/g according to leacheate volume with soil weight ratio, leacheate and molybdenum polution soil are placed in to 50 millilitersIn centrifuge tube, shake up;
(3) centrifuge tube is placed in to oscillator, at 22-28 DEG C, oscillation rate is 200 revs/min, vibrates 1.5 hours;
(4) again centrifuge tube is placed in to centrifuge, with 3000 revs/min of centrifugations 10 minutes, supernatant inclined;
(5), behind residual soil repeating step (2) again-(4) 2-3 time, the content of Molybdenum in Soil can obviously reduce.
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| CN113182338A (en) * | 2021-04-25 | 2021-07-30 | 三明学院 | Method for restoring molybdenum-polluted soil by ultrasonic/oscillation-assisted chemical leaching |
| CN115805230A (en) * | 2022-07-25 | 2023-03-17 | 哈尔滨工业大学 | Method for restoring high-molybdenum-polluted soil by combining plant, microbial inoculum and biochar |
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| NL194502C (en) * | 1994-04-28 | 2002-06-04 | C J Schouten Beheer B V Mede H | Method for the treatment of contaminated dredging spoil for obtaining building materials. |
| CZ284931B6 (en) * | 1997-03-19 | 1999-04-14 | Eko-Vuk, S. R. O. | Process of mercury neutralization in waste |
| JP2001019954A (en) * | 1999-07-05 | 2001-01-23 | Kayoko Sora | Photodegradable ground surface purifier |
| US8735178B2 (en) * | 2006-03-27 | 2014-05-27 | University Of Kentucky Research Foundation | Withanolides, probes and binding targets and methods of use thereof |
| US20100209194A1 (en) * | 2007-09-26 | 2010-08-19 | Verutek Technologies, Inc. | System for soil, groundwater, and surface water remediation, and related methods |
| CA2630894A1 (en) * | 2008-05-02 | 2009-11-02 | Northex Environnement | Method for removing an inorganic contaminant from soils using physico-chemical washing |
| CN202036905U (en) * | 2011-02-15 | 2011-11-16 | 江苏南大光电材料股份有限公司 | Leaching tower device for treatment of tail gas generated in production of metal organic (MO) source |
| CN102225425B (en) * | 2011-04-29 | 2013-01-30 | 沈阳大学 | Leaching method for remedying heavy metal-polluted soil |
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| CN104070059B (en) * | 2014-06-06 | 2016-05-11 | 浙江省环境保护科学设计研究院 | A kind of drip washing stabilisation restorative procedure of processing lead-contaminated soil |
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