CN105855287A - Method for ex-situ remediation of organic contaminated soil by virtue of sodium percarbonate-biological pile technique - Google Patents
Method for ex-situ remediation of organic contaminated soil by virtue of sodium percarbonate-biological pile technique Download PDFInfo
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- CN105855287A CN105855287A CN201610373295.6A CN201610373295A CN105855287A CN 105855287 A CN105855287 A CN 105855287A CN 201610373295 A CN201610373295 A CN 201610373295A CN 105855287 A CN105855287 A CN 105855287A
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- sodium percarbonate
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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
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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
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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Abstract
The invention discloses a method for ex-situ remediation of organic contaminated soil by virtue of a sodium percarbonate-biological pile technique. An organic contaminated soil pile is pre-oxidized by virtue of a sodium percarbonate solution and is subjected to ex-situ bioremediation remediation. According to the method, a sodium percarbonate oxidation technique and an ex-situ bioremediation remediation technique are combined for treating high-concentration organic contaminated soil for the first time, and the advantages of the sodium percarbonate oxidation technique and the ex-situ bioremediation remediation technique are cooperatively enhanced and mutually complemented. The defects of high cost and low practicability of the single sodium percarbonate oxidation technique as well as low efficiency and long period of the single microbiological degradation technique are overcome. By virtue of the method, organic pollutants can be rapidly oxidized, and the rapid and efficient degradation of degradation-resistant organic pollutants in soil can be realized. The method has the advantages of high efficiency, short period, low cost and no secondary pollution and can be applied to large-scale popularization and application.
Description
Technical field
The invention belongs to contaminated soil remediation technical field, being specifically related to a kind of employing SODIUM PERCARBONATE-biology heap technology showering has
The method of machine contaminated soil.
Background technology
Soil, as important surrounding medium, not only carries out matter and energy circulation in system, and with air, water body and biology
Between the most constantly carry out exchanges of mass and energy.Since industrialization, soil in the environmental problem of social economy's fast development association
Become the main gathering ground of pollutant, by various organic pollutions (polycyclic aromatic hydrocarbon (PAHs), Polychlorinated biphenyls (PCBs), adjacent benzene
Dicarboxylic acid esters (PAEs) etc.) contaminated soil area increases day by day, and most organic pollutants is the carcinogenesis that has of more than 4 rings,
And the harm to agricultural product and health has started to appear, serious threat health and Environmental security, therefore to organic contamination soil
Earth carries out repairing extremely the most urgent.
At present, the restorative procedure for organic contamination place soil mainly has peripheral doses, chemical redemption, biological restoration and compound repaiies
The method such as multiple.And for low-concentration organic contaminated soil, owing to biological restoration has efficient low expense and the advantage of non-secondary pollution,
The biggest development has been obtained in terms of soil remediation.And for high-enriched organics contaminated soil, due to organic contaminants in soil
Concentration be greatly increased, permeability and the nutrient needed for growth of microorganism of soil there occurs bigger change, and this makes raw
Thing reparation is limited by very large.And simple biological restoration exists, and repairing efficiency length, degraded are thorough, environmental condition requirement is tight
The problems such as lattice.
Summary of the invention
The defect existed for the technology of existing biologically rehabilitating soil, it is an object of the invention to provide a kind of efficiently, the cycle short,
The method of low cost, rehabilitating soil standard compliant employing SODIUM PERCARBONATE-biology heap technology showering organic polluted soil.
In order to realize above-mentioned technical purpose, the invention provides a kind of employing SODIUM PERCARBONATE-biology heap technology showering organic contamination
The method of soil, after using SODIUM PERCARBONATE solution pre-oxidation organic polluted soil heap body, then is processed by Ex situ bioremediation.
The present invention farther includes following preferred technical scheme:
Preferably in scheme, during utilizing SODIUM PERCARBONATE solution pre-oxidation contaminated soil heap body, described SODIUM PERCARBONATE solution is with organic
The mass ratio of contaminated soil heap body is 1:(2～4).
Preferably in scheme, during utilizing SODIUM PERCARBONATE solution pre-oxidation organic polluted soil heap body, described SODIUM PERCARBONATE solution
Mass percentage concentration is 25～35%.
Preferably in scheme, during utilizing SODIUM PERCARBONATE solution pre-oxidation organic polluted soil heap body, add relative contaminated soil heap
Weight mark is wood flour and the mushroom slag of 2%～4% of 1.5%～2.5%.
By adding wood flour and mushroom slag, not only soil structure improved addictive is had good usefulness, increases soil heap body opening gap, moreover it is possible to give soil
Earth supplements the nutrient substance such as organic matter, nitrogen, phosphorus, potassium and trace element.
Preferably in scheme, during utilizing SODIUM PERCARBONATE solution pre-oxidation organic polluted soil heap body, control reaction temperature be 65～
85 DEG C, react 8～10h.
Preferably in scheme, during Ex situ bioremediation, to the beta-schardinger dextrin-solution of contaminated soil surface sprinkling 20～40g/L, β-
Cyclodextrin solution is (0.05～0.15) with the mass ratio of organic polluted soil heap body: 1.
Preferably in scheme, during Ex situ bioremediation, add original inhabitants' bacterium solution, make the number of original inhabitants bacterium in organic polluted soil heap body
Amount is 8*108Cfu/kg～1.8*109cfu/kg。
Preferably in scheme, during Ex situ bioremediation, spray in contaminated soil heap body containing C, N, the fertilizer of P element,
By pH and nutrient and the monitoring of moisture, adjusting growth and the metabolism environment of microorganism, maintenance contaminated soil heap temperature is
30～40 DEG C, pH is 6.8～7.5, and moisture content is 50～55%, and C:N:P is 100～110:10～15:1.
Under above-mentioned pH, SODIUM PERCARBONATE pre-oxidation degradation capability is relatively strong, and less to ecological environment of soil harm.
Preferably in scheme, during Ex situ bioremediation, by aerating system, organic polluted soil heap body is carried out intermittent aerating,
Every day aeration 3～4 times, each aeration 1～3h, air velocity is 0.8～1.2m3/h。
The method of the present invention, particularly preferably comprises the following steps:
(1) organic polluted soil heap body being crushed aperture is 3-5mm screen cloth, removes bulk gravel；
(2) wood flour and mushroom slag, mix homogeneously are added；
(3) add SODIUM PERCARBONATE solution further, be sufficiently stirred for, mix homogeneously, obtain mixing stockpile；
(4) being stacked in by compound in cuboid isothermal reactor, design temperature is 65～85 DEG C, sustained response 8～10h, and
Reactor is provided with aerating system, spray system, on-line monitoring system and collection and confinement of gases pipeline；
(5) biosurfactant beta-schardinger dextrin-solution is sprayed；
(6) original inhabitants' bacterium solution is added；
(7) sprayed in organic polluted soil heap body containing C, N, the fertilizer of P element by nutrition add-on system；
(8) by aerating system, organic polluted soil heap body is carried out intermittent aerating.
Original inhabitants bacterium of the present invention can be extracted according to following extracting method, comprises the following steps:
1, primary dcreening operation
(1) enrichment culture: 10g contaminated soil is inoculated in the culture medium of enrichment pollutant, 30 DEG C, 140rpm, shaking table
Cultivate 7 days.
(2) mixed vaccine and dilution spread are preserved: draw 0.5mL enrichment culture liquid with liquid-transfering gun and be equipped with 0.5mL40% glycerol
In centrifuge tube, to preserve the mixed vaccine after being enriched with.Draw the enrichment culture liquid 0.5mL after enrichment culture with liquid-transfering gun, move into equipped with
In the test tube of 4.5mL sterilized water, make 10-1Diluent, then draw 10-1Diluent 0.5mL, move into another equipped with 4.5mL without
In the test tube of bacterium water, make 10-2Diluent, the rest may be inferred is respectively prepared 10-3,10-4, 10-5,10-6,10-7,10-8Dilute
Release liquid.Then 0.1mL 10 is drawn with liquid-transfering gun-5,10-6,10-7, three dilution bacterium solution, it is inoculated into the training of corresponding solid
Supporting on base, smoothen with spreader, each dilution factor repeats three, is finally put in 30 DEG C of constant temperature biochemical cultivation cases cultivation 2-3 days,
Observe the growing state of microorganism on isolation medium.
(3) picking colony: select single bacterium colony of well-grown, different colours and form in culture medium, be inoculated in slant culture
In base, put into after the constant temperature biochemical cultivation case of 30 DEG C cultivates 24h, be placed in 4 DEG C of refrigerators preservation, for screening further.
2, multiple sieve
Mixed vaccine and single bacterium are accessed beef extract-peptone fluid medium, and 30 DEG C, 140rpm cultivates 48h, take mixed bacteria liquid and
Single bacterium solution the most by volume mark be 5% inoculum concentration access 50mL crude oil liquid culture medium, 30 DEG C of shaking table shaken cultivation 7 days,
Use determined by ultraviolet spectrophotometry contaminant degradation rate.
3, the preservation of strain
Use inclined-plane Storage in refrigerator method to preserve strain, slant strains is placed in 4 DEG C, in the environment of relative humidity 60%-70%, preserve
In general refrigerator.
Hinge structure, the Advantageous Effects that technical scheme is brought:
Although having the biological heap of use to process contaminated soil in prior art, but it existing cost height, length reaction time, treatment effect
The problems such as the best, workload is big.Inventor also attempted being combined other various chemical oxidization methods with biological heap technology at the research initial stage,
But all do not obtain preferable effect.
Finally, by SODIUM PERCARBONATE oxidation technology is combined with Ex situ bioremediation technology, it is thus achieved that unexpected synergy,
When SODIUM PERCARBONATE oxidation technology and Ex situ bioremediation technology are combined for processing high concentration organic polluted soil, it is possible to obtain non-
The most collaborative reinforced effects.
Present invention specifically aims at organic dirt that Organic substance (such as phenanthrene, naphthalene, acenaphthene, pyrene, phenol) concentration is 1500～3000mg/kg
Dye soil, has extraordinary repairing effect.
As in concrete experimentation, the present invention is directed to the organic polluted soil that organic concentration is 1500～3000mg/kg, warp
After SODIUM PERCARBONATE oxidation 8h, the clearance of each organic pollution is between 47.4%～59.2%, and reacts one through biological heap again
After cycle, clearance reaches more than 70%, after two reaction times, each organic pollution clearance rise to 86.1% with
On, the highest clearance reaches 91.8%.The present invention is greatly improved the repairing effect of prior art, and improves treatment effeciency, logical
Cross coordinated to process, just can obtain preferable repairing effect at short notice.
SODIUM PERCARBONATE oxidation technology and Ex situ bioremediation technology are combined the organic contamination for processing high concentration by the present invention first
Soil, the advantage of SODIUM PERCARBONATE oxidation technology and Ex situ bioremediation technology is collaborative to be strengthened, and has complementary advantages.Overcome single percarbonic acid
Sodium oxidation cost is high, and practicality is low, uses single microbial degradation efficiency low, the defect of cycle length.Energy Quick Oxidation of the present invention
Organic pollution, it is achieved the rapidly and efficiently degraded of soil persistent organic pollutants.Have that efficiency is high, the cycle is short, low cost, nothing
The advantage of secondary pollution, can popularization and application on a large scale.
Present invention obtains the good result of Synergistic being difficult to expect, but the present invention is not merely the letter of existing two schemes
Unijunction closes, and the present inventor is on the basis of probing in a large number, to the step in concrete processing procedure, parameter, addition
Materials etc. have all carried out substantial amounts of improvement, have ensured the acquisition of more beneficial effect further.
The present invention has the most great practicality and using value.
Detailed description of the invention
Following example are intended to further illustrate present invention rather than limit the protection domain of the claims in the present invention.
Embodiment 1
Contaminated soil takes from certain resettlement place, coke-oven plant, pollutes based on polycyclic aromatic hydrocarbon, after testing, contaminated soil China and Philippines, naphthalene, acenaphthene,
The concentration of pyrene is respectively 2367.5mg/kg, 2582.9mg/kg, 2498.4mg/kg, 2518.8mg/kg.
(1) contaminated soil crushing aperture is 4mm screen cloth, removes bulk gravel；
(2) adding, at contaminated soil, wood flour and the mushroom slag of 3% that mass fraction is 2%, it is 4mm's that mushroom slag and wood flour cross aperture
Screen cloth, mix homogeneously；
(3) preparation mass concentration is the SODIUM PERCARBONATE solution of 30%；
(4) SODIUM PERCARBONATE solution is joined in organic polluted soil according to the ratio that mass ratio is 1:3, be sufficiently mixed, stirring
Uniformly；
(5) being stacked in by compound in cuboid isothermal reactor, design temperature is 80 DEG C, sampling detection after sustained response 8h
Each organic concentration, wherein isothermal reactor utilizes the circulation of solar energy heating water to maintain reaction temperature required, and is provided with in reactor
Aerating system, spray system, on-line monitoring system and collection and confinement of gases pipeline；
(6) biosurfactant (beta-schardinger dextrin-solution) of 30g/L, beta-schardinger dextrin-solution and contaminated soil is sprayed to heap body
Mass ratio is 0.1:1；
(7) adding and extract and the indigenous bacterium solution of amplification culture from contaminated soil, making the quantity of antibacterial in soil is 1.5*109cfu/kg。
(8) spray containing C, N, the fertilizer of P element in soil by nutrition add-on system, by pH and nutrient and moisture
The monitoring of content, adjusts growth and the metabolism environment of microorganism, and keeping the soil moisture is 30～40 DEG C, and pH is 7.5, moisture content
Being 53%, C:N:P is 105:11:1.
(9) by aerating system soil carried out intermittent aerating, every day aeration 4 times, each aeration 3h, air velocity is 1.2m3/h。
(10) heap temperature from begin to ramp up at a temperature of to be down to temperature stabilization be a heap running body cycle, each heap running body
After cycle, the concentration of sampling detection target contaminant.
Being found by monitoring, the cycle of operation of heap body is 14 days, takes each organic pollution of sample detection soil of 3 diverse locations
Concentration, testing result is as shown in table 1.
Table 1: each organic analyte detection analysis
As shown in Table 1, after SODIUM PERCARBONATE oxidation 8h, the clearance of each organic pollution is between 47.4%～59.2%, and again
After biological heap one cycle of reaction, clearance reaches more than 70%, and after two reaction times, each organic pollution goes
Except rate rises to more than 86.1%, the highest clearance reaches 91.8%, and after three reaction times, pollutant levels reduce speed
Degree starts to slow down, and tendency is stable, and the highest clearance is 95.5%.
Embodiment 2
Contaminated soil takes from phenol contaminated site, and after testing, in contaminated soil, phenol concentration is 1815.6mg/kg.
(1) contaminated soil crushing aperture is 4mm screen cloth, removes bulk gravel；
(2) adding, at contaminated soil, wood flour and the mushroom slag of 3% that mass fraction is 2%, it is 4mm's that mushroom slag and wood flour cross aperture
Screen cloth, mix homogeneously；
(3) preparation mass concentration is the SODIUM PERCARBONATE solution of 30%；
(4) SODIUM PERCARBONATE solution is joined in organic polluted soil according to the ratio that mass ratio is 1:3, be sufficiently mixed, stirring
Uniformly；
(5) being stacked in by compound in cuboid isothermal reactor, design temperature is 80 DEG C, sampling detection after sustained response 10h
Each organic concentration, wherein isothermal reactor utilizes the circulation of solar energy heating water to maintain reaction temperature required, and is provided with in reactor
Aerating system, spray system, on-line monitoring system and collection and confinement of gases pipeline；
(6) biosurfactant (beta-schardinger dextrin-solution) of 30g/L, beta-schardinger dextrin-solution and contaminated soil is sprayed to heap body
Mass ratio is 0.1:1；
(7) adding and extract and the indigenous bacterium solution of amplification culture from contaminated soil, making the quantity of antibacterial in soil is 1.8*109cfu/kg。
(8) spray containing C, N, the fertilizer of P element in soil by nutrition add-on system, by pH and nutrient and moisture
The monitoring of content, adjusts growth and the metabolism environment of microorganism, and keeping the soil moisture is 30～40 DEG C, and pH is 7.0, moisture content
Being 54%, C:N:P is 108:13:1.
(9) by aerating system soil carried out intermittent aerating, every day aeration 4 times, each aeration 3h, air velocity is 1.2m3/h。
(10) heap temperature from begin to ramp up at a temperature of to be down to temperature stabilization be a heap running body cycle, each heap running body
After cycle, the concentration of sampling detection target contaminant.
Being found by monitoring, the cycle of operation of heap body is 12 days, and the sample detection soil organic pollutant taking 3 diverse locations is dense
Degree.1,2, No. 3 position initial concentrations are respectively 1815.6mg/kg, 1816.4mg/kg, 1815.9mg/kg after testing.Pass through
After SODIUM PERCARBONATE oxidation 10h, the clearance of phenol reaches more than 60%, and the clearance that biological heap reacts the 1st all after date phenol reaches
More than 80%, to react the 2nd week after date clearance and reach more than 90%, react the 3rd all after date and tend to stable, the highest of phenol is gone
Except rate reaches 95.3%.
Table 2: phenol detection is analyzed
Claims (10)
1. the method using SODIUM PERCARBONATE-biology heap technology showering organic polluted soil, it is characterised in that used carbon
After acid sodium solution pre-oxidation organic polluted soil heap body, then processed by Ex situ bioremediation.
Method the most according to claim 1, it is characterised in that SODIUM PERCARBONATE solution and the quality of organic polluted soil heap body
Ratio is 1:(2～4).
Method the most according to claim 1 and 2, it is characterised in that the mass percentage concentration of described SODIUM PERCARBONATE solution is
25～35%.
Method the most according to claim 1, it is characterised in that SODIUM PERCARBONATE solution pre-oxidation organic polluted soil heap body mistake
Cheng Zhong, adds wood flour and the mushroom slag of 2%～4% that relative organic polluted soil heap weight mark is 1.5%～2.5%.
Method the most according to claim 1, it is characterised in that SODIUM PERCARBONATE solution pre-oxidation organic polluted soil heap body mistake
Cheng Zhong, it is 65～85 DEG C that reaction temperature controls, and reacts 8～10h.
Method the most according to claim 1, it is characterised in that during Ex situ bioremediation, to organic polluted soil heap
The beta-schardinger dextrin-solution of 20～40g/L is sprayed in surface, and beta-schardinger dextrin-solution is (0.05～0.15) with the mass ratio of contaminated soil: 1.
7., according to the method described in claim 1 or 6, it is characterised in that during Ex situ bioremediation, add original inhabitants' bacterium solution,
Making the quantity of original inhabitants bacterium in organic polluted soil heap body is 8*108Cfu/kg～1.8*109cfu/kg。
Method the most according to claim 1, it is characterised in that during Ex situ bioremediation, to organic polluted soil heap
Body sprays containing C, N, the fertilizer of P element, by pH and nutrient and the monitoring of moisture, adjust microorganism growth and
Metabolism environment, maintaining contaminated soil heap temperature is 30～40 DEG C, and pH is 6.8～7.5, and moisture content is 50～55%, and C:N:P is
100～110:10～15:1.
9., according to the method described in claim 1 or 8, it is characterised in that during Ex situ bioremediation, pass through aerating system
Organic polluted soil heap body is carried out intermittent aerating, every day aeration 3～4 times, each aeration 1～3h, air velocity is 0.8～1.2m3/h。
10. according to claim 1,2, method described in any one of 4-6, it is characterised in that comprise the following steps:
(1) organic polluted soil heap body being crushed aperture is 3-5mm screen cloth, removes bulk gravel；
(2) wood flour and mushroom slag, mix homogeneously are added；
(3) add SODIUM PERCARBONATE solution further, be sufficiently stirred for, mix homogeneously, obtain mixing stockpile；
(4) being stacked in by compound in cuboid isothermal reactor, design temperature is 65～85 DEG C, sustained response 8～10h, and
Reactor is provided with aerating system, spray system, on-line monitoring system and collection and confinement of gases pipeline；
(5) biosurfactant beta-schardinger dextrin-solution is sprayed；
(6) original inhabitants' bacterium solution is added further；
(7) sprayed containing C, N, the fertilizer of P element by nutrition add-on system；
(8) by aerating system, contaminated soil heap body is carried out intermittent aerating.
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| CN108690632A (en) * | 2018-07-02 | 2018-10-23 | 中国石油天然气集团有限公司 | A kind of soil pollution remediation composition and its application |
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| CN111573935A (en) * | 2020-05-29 | 2020-08-25 | 山东大学 | Water treatment process for enhancing coagulation and odor removal of drinking water and application |
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| CN111573935B (en) * | 2020-05-29 | 2021-09-28 | 山东大学 | Water treatment process for enhancing coagulation and odor removal of drinking water and application |
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