CN106424129A - Method for remedying soil contaminated with 2,2',4,4'-tetrabromodiphenyl ether - Google Patents
Method for remedying soil contaminated with 2,2',4,4'-tetrabromodiphenyl ether Download PDFInfo
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- CN106424129A CN106424129A CN201610894681.XA CN201610894681A CN106424129A CN 106424129 A CN106424129 A CN 106424129A CN 201610894681 A CN201610894681 A CN 201610894681A CN 106424129 A CN106424129 A CN 106424129A
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- composting material
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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
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Biotechnology (AREA)
- Health & Medical Sciences (AREA)
- Inorganic Chemistry (AREA)
- Biomedical Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Mycology (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for remedying soil contaminated with 2,2',4,4'-tetrabromodiphenyl ether. The method comprises the following steps that agricultural solid waste is mixed with the soil contaminated with 2,2',4,4'-tetrabromodiphenyl ether to obtain a compost raw material; fatty alcohol-polyoxyethylene ether is added in the compost raw material, and a rhodococcus RAH1 strain is inoculated for composting, so that remedying of the soil contaminated with 2,2',4,4'-tetrabromodiphenyl ether is completed. The soil contaminated with 2,2',4,4'-tetrabromodiphenyl ether is remedied with agricultural solid waste, the potential of indigenous microorganisms in the soil is stimulated, the indigenous microorganisms are abundantly bred within the short time, and the activity of the microorganisms is improved; and the RAH1 strain is inoculated, so that the ability of degrading contaminants is improved greatly, and the method has the advantages of being simple to operate and maintain, low in operation cost, and low in environmental risk.
Description
Technical field
The present invention relates to technical field of soil remediation, more particularly, to a kind of reparation 2,2 ', 4,4 '-tetrabromo Biphenyl Ether Polluted Soil
The method of earth.
Background technology
PBDE (Polybrominated dipheny lethers, PBDEs) is prevalent in environment
One class persistence organic pollutant (Persistent Organic Pollutants, POPs).Due to larger to environmental hazard,
European Union in 2006 passes a resolution and clearly limits use in electronic product for the PBDEs.And in May, 2009, because PBDEs is serious
Harm human health and natural environment,《Convention of Stockholm》Added into pact.Research shows, PBDEs average molecular
Quality is big, steam forces down, water-soluble low and Kow (octanol-water partition coefficient) value height, is easily adsorbed being accumulated in soil, such as exists
The place such as China's Delta of the Pearl River is detected by the PBDEs containing high concentration in soil.PBDEs has 209 kinds of monomeric compounds.
Wherein 2,2 ', 4,4 '-tetrabromo Biphenyl Ether (BDE-47) is extensively to be detected and a kind of larger PBDEs of bio-toxicity, has research
Show that BDE-47 and its metabolite can lead to nervous system development abnormal, occur noting lacking often in contact with the children to BDE-47
The risk falling into many dynamic impairment property can greatly increase.
Remove 2,2 ', 4 in soil at present, the method species of 4 '-tetrabromo Biphenyl Ether is less, common are light degradation method, main
If using organic solvent etc. by 2 in soil, 2 ', 4,4 '-tetrabromo Biphenyl Ether leaches out, then carries out ultraviolet light to leacheate
Irradiate, thus reaching degraded 2,2 ', 4, the purpose of 4 '-tetrabromo Biphenyl Ether.But the method is relatively costly, and during drip washing
The physicochemical property of soil can be impacted, therefore range of application has certain limitation.And it is at present and traditional physico
Learn restorative procedure to compare, biological prosthetic because itself having that expense is low, environmental risk is little, be not likely to produce secondary pollution, be easy to
Management with operate the advantages of and widely paid close attention to, the engineering practice of repairing polluted soil has been given play to the work becoming more and more important
With showing good development prospect.But it is affected by the quantity of Soil Microorganism and activity limits, and 2,2 ', 4,4 '-four
Bromo biphenyl ether hydrophily is weaker, leads to be difficult with biotechnology efficient degradation soil 2,2 ', 4,4 '-tetrabromo Biphenyl Ether.
Generally, surfactant such as AEO etc., can indissoluble organic pollution in effective solubilization soil,
It is widely used in soil remediation practice.Meanwhile, it is generally considered using hardly degraded organic substance in compost treatment soil
It is a kind of effective method, therefore how to utilize Composting technology, increase the bioavailability of BDE-47, improve contaminated soil
The removal efficiency of middle BDE-47, and then the method developing BDE-47 in a kind of effective biological removal soil, are this areas
The direction that scholar is studying.
Content of the invention
The technical problem to be solved in the present invention is to overcome conventional physical, chemical redemption 2,2 ', 4,4 '-tetrabromo Biphenyl Ether
(BDE-47) deficiency of contaminated soil, provides the reparation BDE-47 contaminated soil that a kind of environmental risk is low, management is easy to operate
Method, can not only effectively remove the BDE-47 in soil, and can also effectively carry by using agricultural solid waste compost
The utilization rate of high agricultural wastes, reduces agricultural wastes pollution；This restorative procedure is simple to operate simultaneously, management service facilitates, and is one
The method planting the reparation BDE-47 contaminated soil that environmental risk is low, repairing effect is stable.
For solving above-mentioned technical problem, there is provided a kind of reparation 2,2 ', 4, the method for 4 '-tetrabromo Biphenyl Ether contaminated soil,
The method comprising the steps of：
S1, by agricultural solid waste and 2,2 ', 4,4 '-tetrabromo Biphenyl Ether contaminated soil is mixed to get composting material；
S2, in described composting material, add AEO, and inoculate Rhod RAH1 bacterial strain, carry out heap
Fertilizer, completes to 2,2 ', 4, the reparation of 4 '-tetrabromo Biphenyl Ether contaminated soil.
Above-mentioned method is it is preferred that described S2 step is specially：
S2-1, preparation AEO solution, will be former to described AEO solution and described compost
Expect the mixture being obtained by mixing；
S2-2, is configured to bacteria suspension after RAH1 bacterium is activated, is added in the described mixture of S2-1 step；
S2-3, regulation moisture content are 45%～60%, carry out compost.
Above-mentioned method is it is preferred that the concentration of described AEO solution is 10g/L～20g/L.
Above-mentioned method is it is preferred that the concentration of bacteria suspension described in step S2-2 is 1 × 106CFU/mL～1 × 107CFU/
ML, the addition of described bacteria suspension is the 3%～5% of described mixture dry weight.
Above-mentioned method is it is preferred that in described S1 step, described agricultural solid waste includes straw, dish leaf and wheat bran.
Above-mentioned method it is preferred that in described S1 step, described 2,2 ', 4,4 '-tetrabromo Biphenyl Ether contaminated soil, straw,
Dish leaf, the mass ratio of wheat bran are (8～20): (7～13): (3～5): (1～3).
Above-mentioned method is it is preferred that the carbon-nitrogen ratio of described composting material is 20～30: 1.
Above-mentioned method it is preferred that AEO described in described S2 step addition be 0.1g/kg～
0.5g/kg.
Above-mentioned method is it is preferred that described compost is aerobic compost；The time of described compost is 45d～90d；Described heap
Fertile temperature is 20 DEG C～70 DEG C.
Above-mentioned method is it is preferred that in described composting process, compost 1d～30d control composting material moisture content is
55%～60%, control composting material moisture content to be 45%～55% after the 31d of compost.
Compared with prior art, it is an advantage of the current invention that：
(1) the invention provides a kind of repair 2,2 ', 4, the method for 4 '-tetrabromo Biphenyl Ether contaminated soil, by cultural solid
Waste and 2,2 ', 4,4 '-tetrabromo Biphenyl Ether contaminated soil mixes, and repairs 2,2 ', 4 using agricultural solid residue, and 4 '-tetrabromo joins
In the composting process of phenylate contaminated soil, excite the potentiality of indigenous microorganism in soil so as to a large amount of in the short period of time
Breeding, microbial activity rises significantly.And be vaccinated with and have preferable degradation capability to 2,2 ', 4,4 '-tetrabromo Biphenyl Ether
Rhodococcus sp.RHA1 bacterial strain is so as to the ability of degradation of contaminant is greatly improved.Instant invention overcomes it is physico
Learn reparation the physicochemical property of soil is damaged, reduce soil function and be also easy to produce the defects such as secondary pollution, there is operation
Safeguard simple, operating cost is low, the advantage such as environmental risk is little, is a kind of side of BDE-47 in soil of can quickly effectively degrading
Method.
(2) present invention has added AEO in composting process, can make 2,2 ', 4,4 '-tetrabromo Biphenyl Ether
In being soluble in the aqueous phase, solve typically biological prosthetic because of 2,2 ', 4,4 '-tetrabromo Biphenyl Ether is insoluble in water and can not be utilized by microorganism
Decompose, the problem of repairing effect difference.
(3) the invention provides a kind of repair 2,2 ', 4, the method for 4 '-tetrabromo Biphenyl Ether contaminated soil, by 2,2 ', 4,
4 '-tetrabromo Biphenyl Ether contaminated soil, straw, dish leaf, the mass ratio of wheat bran are (8～20): (7～13): (3～5): (1～3).
Wherein straw provides carbon source, and wheat bran mainly provides nitrogen source, and dish leaf act as providing easily biodegradable organicses, and soil provides micro- life.Four
The mass ratio of kind of composition is in (8～20): (7～13): (3～5): can provide suitable carbon-nitrogen ratio in the range of (1～3) it is ensured that heap
Fertilizer is smoothed out.If exceeding, the too high carbon causing to be available for consuming of C/N is many, and nitrogen nutriment lacks relatively, great majority
The growth of microorganism is restricted, and organic matter degradation is slow.If C/N is low, the carbon being available for consuming is few, can lead to compost temperature
The low and high temperature phase is short, and the phase of becoming thoroughly decomposed is delayed, and due to nitrogen relative surplus, then nitrogen will become ammoniacal nitrogen and volatilize.Compost is led to go out
Show stench and nitrogen is lost in a large number.
(4) the invention provides a kind of repair 2,2 ', 4, the method for 4 '-tetrabromo Biphenyl Ether contaminated soil, compost 1d～
It is 55%～60% growth being conducive to microorganism that 30d controls composting material moisture content.Compost antecedent moisture is excessive, reduces free
Porosity, impact air diffusion, easily cause anaerobic state, produce percolate process problem simultaneously；Moisture is less than 40%, microorganism
Activity reduces, and compost temperature declines therewith.
Brief description
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, clear, complete description is carried out to the technical scheme in the embodiment of the present invention.
Fig. 1 is the time dependent broken line scatterplot of 2,2 ', 4,4 '-tetrabromo Biphenyl Ether residual rate under compost and natural conditions
Figure.
Fig. 2 temperature variation in composting process for the heap body in the embodiment of the present invention 1 and comparative example 2.
Specific embodiment
Below in conjunction with Figure of description and concrete preferred embodiment, the invention will be further described, but not therefore and
Limit the scope of the invention.
Embodiment
Material employed in following examples and instrument are commercially available.
Embodiment 1
A kind of reparation 2 of the present invention, 2 ', 4, the method for 4 '-tetrabromo Biphenyl Ether (BDE-47) contaminated soil, walk including following
Suddenly：
(1) pretreatment of raw material：Respectively straw, dish leaf are air-dried, are broken into length about 1～1.5cm.Take BDE-47 content
For the soil breaking of 0.384mg/kg (dry weight), cross 10 mesh sieves.
(2) preparation of composting material：By pretreated soil, straw, dish leaf and wheat bran according to mass ratio be 15: 11: 3
: 2 are mixed to get composting material, and the carbon-nitrogen ratio making composting material is 25: 1.
(3) will be soluble in water for AEO (AEO-9), it is configured to the fatty alcohol polyoxy second that concentration is 10g/L
Alkene ethereal solution.Above-mentioned AEO solution is added (to add fatty alcohol polyoxy in rear composting material in composting material
The initial concentration of vinethene is about 0.35g/kg dry weight), adjust moisture content and obtain mixed soil to 58%.
(4) RHA1 bacterial strain is taken to be activated, being configured to concentration is 5 × 106The bacteria suspension of CFU/mL.Above-mentioned bacteria suspension is added
It is added in the mixed soil of step (3) (bacteria suspension dosage by the 5% of mixed soil dry weight), then carry out compost treatment.Heap
During extensive use of chemical fertilizer, it is 55%～60%, 1～15d that compost early stage (i.e. 1～30d of compost) controls composting material moisture content, often
Turning oxygen supply in three days, 15～30d, every 10d turning is supported, due to using bar buttress formula compost, independently heating up.Therefore can adopt and add water,
The modes such as turning prevent compost temperature too high, generally 40 DEG C～50 DEG C of temperature.The compost later stage (i.e. 31～75d of compost) is controlled
Composting material moisture content processed is 45%～50%.In composting process, 30～50d, every 10d turning is once；50d～75d, often
Once, temperature is generally 20 DEG C～30 DEG C for 20d turning.Heap body is designated as heap body A.
Comparative example 1
A kind of method of reparation BDE-47 contaminated soil, after BDE-47 contaminated soil is sieved, at compost under nature
Reason 75d, is designated as heap body B.
Comparative example 2
According to embodiment 1 method repair 2,2 ', 4,4 '-tetrabromo Biphenyl Ether (BDE-47) contaminated soil, during it not
Inoculation RHA1 bacterial strain, remaining step is consistent with embodiment 1, is designated as heap body C.
In the processing procedure of 75d, investigate BDE-47 residual rate in heap body A, B, C respectively over time, specifically residual
Stay rate result referring to table 1 and Fig. 1.
Table 1：BDE-47 residual rate table over time in heap body
Fig. 1 is degraded tendency chart.Knowable to the result of table 1 and Fig. 1：Substantially excellent to the removal efficiency of BDE-47 by compost
The removal efficiency to BDE-47 under nature, and better than not inoculating heap body (initial stage in Fig. 1 of Rhod RAH1 bacterial strain
BDE-47 residual rate is the error brought using internal mark method determination BDE-47 more than 100%).Almost identical in initial concentration
In the case of (after testing the initial concentration of heap body A and B be respectively 0.185mg/kg and 0.183mg/kg, dry weight), under nature
The residual rate of BDE-47 still reaches 96.88% after 75d；Not inoculating RAH1 bacterial strain residual rate is 60.2%, and in compost 75d
Afterwards, the residual rate of BDE-47 is only 50.8%, and clearance is 16.4 times in its natural state of the same period, and removal effect is good.
Investigate to heap body A and heap body C temperature change during compost 75d, investigate result referring to table 2 and Fig. 2.
Table 2：The change table of heap temperature in compost
The above, be only presently preferred embodiments of the present invention, and not the present invention is made with any pro forma restriction.Though
So the present invention is disclosed as above with preferred embodiment, but is not limited to the present invention.Any it is familiar with those skilled in the art
Member, in the case of the Spirit Essence without departing from the present invention and technical scheme, can be utilized in the methods and techniques of the disclosure above
Hold and technical solution of the present invention is made with many possible variations and modification, or the Equivalent embodiments being revised as equivalent variations.Therefore,
Every content without departing from technical solution of the present invention, the technical spirit of the foundation present invention is to made for any of the above embodiments any simple
Modification, equivalent, equivalence changes and modification, all still fall within the range of technical solution of the present invention protection.
Claims (10)
1. a kind of repair 2,2 ', 4, the method for 4 '-tetrabromo Biphenyl Ether contaminated soil it is characterised in that methods described include following
Step：
S1, by agricultural solid waste and 2,2 ', 4,4 '-tetrabromo Biphenyl Ether contaminated soil is mixed to get composting material；
S2, in described composting material, add AEO, and inoculate Rhod RAH1 bacterial strain, carry out compost,
Complete the reparation to 2,2 ', 4,4 '-tetrabromo Biphenyl Ether contaminated soil.
2. method according to claim 1 is it is characterised in that described S2 step is specially：
S2-1, preparation AEO solution, described AEO solution and described composting material are mixed
Mixture obtained from conjunction；
S2-2, is configured to bacteria suspension after RAH1 bacterium is activated, is added in the mixture described in S2-1 step；
S2-3, regulation moisture content are 45%～60%, carry out compost.
3. method according to claim 2 is it is characterised in that the concentration of described AEO solution is 10g/
L～20g/L.
4. method according to claim 2 it is characterised in that bacteria suspension described in step S2-2 concentration be 1 ×
106CFU/mL～1 × 107CFU/mL, the addition of described bacteria suspension is the 3%～5% of described mixture dry weight.
5. method according to any one of claim 1 to 4 is it is characterised in that in described S1 step, described cultural solid
Waste includes straw, dish leaf and wheat bran.
6. method according to claim 5 is it is characterised in that in described S1 step, described 2,2 ', 4,4 '-four bromo biphenyls
Ether contaminated soil, straw, dish leaf, the mass ratio of wheat bran are (8～20): (7～13): (3～5): (1～3).
7. method according to any one of claim 1 to 4 is it is characterised in that the carbon-nitrogen ratio of described composting material is 20
～30: 1.
8. method according to any one of claim 1 to 4 is it is characterised in that poly alkyl alcohol described in described S2 step
The addition of oxygen vinethene is 0.1g/kg～0.5g/kg.
9. method according to any one of claim 1 to 4 is it is characterised in that described compost is aerobic compost；Described heap
The fertile time is 45d～90d；Described compost temperature is 20 DEG C～70 DEG C.
10. method according to any one of claim 1 to 4 is it is characterised in that in described composting process, compost 1d
～30d control composting material moisture content be 55%～60%, after the 31d of compost control composting material moisture content be 45%～
55%.
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Cited By (1)
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