CN108723069A - A kind of restorative procedure of organic polluted soil - Google Patents
A kind of restorative procedure of organic polluted soil Download PDFInfo
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- CN108723069A CN108723069A CN201810461318.8A CN201810461318A CN108723069A CN 108723069 A CN108723069 A CN 108723069A CN 201810461318 A CN201810461318 A CN 201810461318A CN 108723069 A CN108723069 A CN 108723069A
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- soil
- container bag
- organic
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- restorative procedure
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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
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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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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a kind of restorative procedures of organic polluted soil to isolate bulk soil first with screening；The method of cyclone fraction grade is by land classification again, and with separating coarse-grained soil, level-one desorption is carried out to the organic matter in soil sieving and desorbing agent and remover booster being added in classification process；The fine-grained soil that cyclone overflow is separated carries out two level ultrasound desorption；The drum mixer of the container bag group equipped with adsorbent, organic pollutant molecule is recycled to enter container bag, adsorbent adsorbs organic pollutant molecule.Absorption recycles vibrosieve to separate out fine-grained soil later, and container bag group is recycled, and adsorbent therein is continued with as power generation raw material, and fine-grained soil carries out concentration press filtration.Present invention efficiently solves the reparation problems of organic polluted soil, and whole process is environmentally protective, non-secondary pollution, and sorbent used is the lower carbon-based material of added value, of low cost.
Description
Technical field
The invention belongs to technical field of soil remediation, are related to a kind of restorative procedure of organic polluted soil.
Background technology
In recent years, the level of economic development in China improves rapidly, and urbanization process is accelerated, and industrialized pattern occurs larger
Change, a large amount of industrial and mineral land used receives larger pollution.The most serious is industrial land, the models of pollution for pollution level
It encloses and compares concentration, the depth of pollution reaches beneath tens of rice, and underground water and soil all receive serious pollution.Soil is dirty
So that living resources diversity is increasingly reduced after dye, land resource is increasingly in short supply, this seriously threatens the health of human body, ecology
Stabilization and social harmony of environment etc..Although although China has formulated the text of corresponding specification contaminated site environmental management
Part, but it is fewer to ambient soil repairing research, and therefore, repairing situation to soil pollution and study has important show
Sincere justice.
For soil remediation problem, the present invention has found when investigating organic polluted soil situation, benzene homologues, polycyclic
Aromatic hydrocarbons is most important pollutant in coke-oven plant, and chemical industry coal chemical enterprise is in process of production by a organized way and amorphous
Pollution object is discharged into air or soil by discharge, and pollutant is spread rapidly, in addition, in storage, transport and machining object
During material, material leaks to cause soil pollution, and the workshop that the contaminated material of omission is mainly distributed includes：Coking, coal
Gas purifies and tar product recovery workshop, the soil layer of pollution are predominantly located at the silt layer region of 0-5m.Pollution to soil
Object carries out experimental study, it is found that the diversity ratio of the polycyclic aromatic hydrocarbon content in soil is larger.When observing the pollutant of underground water,
It should focus on the concentration of concern benzene.In short, during to coke-oven plant's soil remediation, to determine and select appropriate reparation countermeasure.
Invention content
In response to the problems existing in the prior art, the purpose of the present invention is to provide a kind of restorative procedures of organic polluted soil.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of restorative procedure of organic polluted soil, includes the following steps：
Step a will carry out removal of impurities by the soil of organic contamination and remove iron, removes wherein non-soil part and chalybeate
Matter obtains soil material；
Step b sieves the obtained soil materials of step a, and in screening process be added containing desorbing agent with
And the recirculated water of remover booster, organic pollution is subjected to level-one desorption from soil, the soil after crushing and screening enters follow-up place
Reason, isolate grain size 13mm or more bulk soil；Wherein, in recirculated water, a concentration of 100-300g/t of desorbing agent is helped
A concentration of 25-75g/t of de- agent；
Step c, then the Soil Utilization classifying cyclone after step b crushing and screenings is classified, isolate 6mm's or more
Soil coarse grained, grain size enters less than or equal to 6mm fine fraction soil to be handled in next step；
Fine fraction soil that step c is obtained is added agitator and is stirred by step d, and be wherein passed through in step b
The identical recirculated water containing desorbing agent and remover booster and additional ultrasonic wave carry out two level desorption；
The obtained products of step d are passed through in the drum mixer equipped with container bag group, are filled in container bag group by step e
There is adsorbent, wherein the organic pollutant molecule to get off is desorbed in water phase enters container bag through container bag non-woven fabrics housing,
Adsorbent adsorbs organic pollutant molecule；
Product after step e absorption is passed through in vibrating screen, by container bag group and grain size less than or equal to 6mm's by step f
Fine fraction soil is detached；
The step f fine-grained soils separated are passed through in sedimentation basin by step g, and flocculant and flocculating agent is added, it is laggard
Row precipitation, then carries out press filtration, drying, filtrate is passed through in circulation, is recycled；
Container bag group after step f absorption is passed through in drier and is dried, adsorbent therein is made by step h
It is utilized again for steam power plant's raw material；
Step i monitors the concentration of desorbing agent and remover booster in circulating water pool, if the concentration of desorbing agent is less than 100g/t, helps
The concentration of de- agent is less than 25g/t, then prepares the aqueous solution containing desorbing agent and remover booster and be added thereto, keep desorbing agent concentration extensive
Again to 100-300g/t, remover booster concentration is restored to 25-75g/t；
Step j if quantity of circulating water is less than the 80% of initial water then needs that clear water is added.
Further, in the step b, desorbing agent is nonionic surfactant Tween80, DNP10, and anion is caught
Receive agent SDS, one kind of cation-collecting agent CTAB or the mixture of nonionic surfactant TX-100 and EDTA；
Further, in the step b, remover booster is acetone.
Further, in the step e, adsorbent is carbon-based material.
Further, the adsorbent be particulate coke powder, particulate coal dust, particulate semi-coke powder it is one or more.
Further, in the step f, container bag group is made of multiple container bags, and the material of container bag is terylene, brocade
The non-woven fabrics of synthetic fibre fiber synthesis.
Further, in the step g, flocculating agent is ferric trichloride, and flocculant is ferric-polysilicate.
Further, in the step g, the addition of flocculant is 10-30g/t, and the addition of flocculating agent is 1-5g/t.
Further, in the step h, when dry, drying temperature will be less than the volatilization temperature of pollutant.
Beneficial effects of the present invention are：The present invention utilizes the method successfully dirt by enrichment in the soil of desorption-absorption
Dye object is transferred in carbon-based material, and adsorption efficiency is high, and the removal rate of organic matter is good.
Sorbent used is the lower product of added value, it is made to get the efficient use.Used sorbing material can
To be continued with directly as heat source.It is simple with flow, processing cost is low, resource utilization is high, do not have secondary pollution, ring
The advantages that border is friendly.
Description of the drawings
Fig. 1 is the process flow chart of the present invention；
Fig. 2 is the adsorption process schematic diagram of step e.
Specific implementation mode
The present invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of restorative procedure of organic polluted soil of the present invention, includes the following steps：
Step a will carry out removal of impurities by the soil of organic contamination and remove iron, removes wherein non-soil part and chalybeate
Matter obtains soil material；
Step b sieves the obtained soil materials of step a, and in screening process be added containing desorbing agent with
And the recirculated water of remover booster, organic pollution is subjected to level-one desorption from soil, the soil after crushing and screening enters follow-up place
Reason isolates grain size in the bulk soil of 13mm or more, and the soil after crushing and screening is the soil that grain size is less than or equal to 13mm,
Product as this step；Wherein, in recirculated water, a concentration of 100-300g/t of desorbing agent, a concentration of 25- of remover booster
75g/t；Desorbing agent is nonionic surfactant Tween80, DNP10, anionic collector SDS, cation-collecting agent CTAB
One kind or nonionic surfactant TX-100 and EDTA mixture；Remover booster is acetone；
Step c, then (grain size i.e. obtained in the previous step is less than or equal to the soil of 13mm by the soil after step b crushing and screenings
Earth) it is classified using classifying cyclone, the soil coarse grained of 6mm or more is isolated, grain size is less than or equal to 6mm fine fraction soil
It is handled into next step；
The fine fraction soil that step c is obtained is added agitator and is stirred, and is passed through wherein and step b by step d
In the identical recirculated water containing desorbing agent and remover booster and additional ultrasonic wave carry out two level desorption；
The obtained products of step d are passed through in the drum mixer equipped with container bag group, are filled in container bag group by step e
There is adsorbent, wherein the organic pollutant molecule to get off is desorbed in water phase enters container bag through container bag non-woven fabrics housing,
Adsorbent adsorbs organic pollutant molecule；Adsorption process is as shown in Figure 2；Wherein, adsorbent using cost 200 yuan/
The ton lower carbon-based material of particulate added value below, such as particulate coke powder, particulate coal dust, particulate semi-coke powder；
Product after step e absorption is passed through in vibrating screen, container bag group and grain size is less than or equal to 6mm by step f
Fine fraction soil detached；Container bag group is made of multiple container bags, and the material of container bag is terylene, nylon fibre conjunction
At non-woven fabrics；
The step f fine-grained soils separated are passed through in sedimentation basin by step g, flocculant and flocculating agent are added, later
It is precipitated, then carries out press filtration, drying, filtrate is passed through in circulation, is recycled；Wherein, flocculating agent is
Ferric trichloride, flocculant are ferric-polysilicate；The addition of flocculant is 10-30g/t, and the addition of flocculating agent is 1-5g/t；
Container bag group after step f absorption is passed through in drier and is dried, adsorbent therein is made by step h
It is utilized again for steam power plant's raw material；When dry, temperature will determine that drying temperature will be less than depending on pollutant kind when dry
The volatilization temperature of pollutant, temperature excessively high should not prevent its volatilization；
Step i monitors the concentration of desorbing agent and remover booster in circulating water pool, if the concentration of desorbing agent is less than 100g/t, helps
The concentration of de- agent is less than 25g/t, then prepares the aqueous solution containing desorbing agent and remover booster and be added thereto, keep desorbing agent concentration extensive
Again to 100-300g/t, remover booster concentration is restored to 25-75g/t；
Step j if quantity of circulating water is less than the 80% of initial water then needs that clear water is added.
With reference to specific embodiment, the present invention will be further described.
Embodiment
Pollution source soil comes from Soils In The Region within Xuzhou coke-oven plant periphery 1km, will be carried out by the soil of organic contamination
Removal of impurities with remove iron, remove wherein non-soil part and iron compound, obtain soil material, by obtained soil material into
Row screening, and be added in screening process and contain recirculated waters of the CTAB as desorbing agent and acetone as remover booster, it will be organic
Pollutant carries out level-one desorption from soil, and the soil after crushing and screening enters subsequent processing, isolates grain size in 13mm or more
Bulk soil；Obtained soil material is classified using classifying cyclone again, isolates the thick of grain size 6mm or more
Grain soil, grain size enters less than or equal to the fine-graded soil of 6mm to be handled in next step；Stirring is added in soil after crushing and screening
Bucket be stirred, and be passed through wherein the recirculated water containing desorbing agent and remover booster identical with concentration before and it is additional surpass
Sound wave carries out two level desorption；Obtained product is passed through in the drum mixer equipped with container bag group, and carbon is housed in container bag group
The adsorbent of sill enters wherein the organic pollutant molecule to get off is desorbed in water phase through container bag non-woven fabrics housing
Container bag, adsorbent adsorb organic pollutant molecule；Product after absorption is passed through in vibrating screen, by container bag group
Fine-grained soil with grain size less than or equal to 6mm is detached；The fine-grained soil separated is passed through in sedimentation basin, and cohesion is added
A concentration of 3.0g/t is added in agent ferric trichloride, and flocculant ferric-polysilicate PASF is added, a concentration of 20g/t is added, carries out later
Precipitation then carries out press filtration, drying, filtrate is passed through in circulation, is recycled；Container bag after absorption
Group, which is passed through in drier, to be dried, and is utilized adsorbent therein as steam power plant's raw material again.
Experimental Research result is as shown in table 1 below：
Table 1
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of restorative procedure of organic polluted soil, it is characterised in that：Include the following steps：
Step a will carry out removal of impurities by the soil of organic contamination and remove iron, removes wherein non-soil part and iron compound, obtain
To soil material；
Step b sieves the obtained soil materials of step a, and is added containing desorbing agent and helps in screening process
The recirculated water of de- agent, level-one desorption is carried out by organic pollution from soil, and the soil after crushing and screening enters subsequent processing, point
Separate out grain size 13mm or more bulk soil；Wherein, in recirculated water, a concentration of 100-300g/t of desorbing agent, remover booster
A concentration of 25-75g/t；
Step c, then the Soil Utilization classifying cyclone after step b crushing and screenings is classified, isolate the coarse grain of 6mm or more
Soil, grain size enters less than or equal to 6mm fine fraction soil to be handled in next step；
The fine fraction soil that step c is obtained is added agitator and is stirred by step d, and identical with step b being wherein passed through
The recirculated water containing desorbing agent and remover booster and additional ultrasonic wave carry out two level desorption；
The obtained products of step d are passed through in the drum mixer equipped with container bag group by step e, equipped with suction in container bag group
Attached dose, wherein the organic pollutant molecule to get off is desorbed in water phase enters container bag through container bag non-woven fabrics housing, absorption
Organic pollutant molecule is adsorbed in agent；
Product after step e absorption is passed through in vibrating screen, container bag group and grain size is less than or equal to the particulate of 6mm by step f
Grade soil is detached；
The step f fine-grained soils separated are passed through in sedimentation basin by step g, and flocculant and flocculating agent is added, is sunk later
It forms sediment, then carries out press filtration, drying, filtrate is passed through in circulation, is recycled；
Container bag group after step f absorption is passed through in drier and is dried, using adsorbent therein as heat by step h
Power plant's raw material is utilized again；
Step i monitors the concentration of desorbing agent and remover booster in circulating water pool, if the concentration of desorbing agent is less than 100g/t, remover booster
Concentration be less than 25g/t, then prepare the aqueous solution containing desorbing agent and remover booster be added thereto, make desorbing agent concentration restore to
100-300g/t, remover booster concentration are restored to 25-75g/t；
Step j if quantity of circulating water is less than the 80% of initial water then needs that clear water is added.
2. the restorative procedure of organic polluted soil according to claim 1, it is characterised in that：In the step b, desorbing agent
For nonionic surfactant Tween80, DNP10, anionic collector SDS, one kind of cation-collecting agent CTAB or it is non-from
The mixture of sub- surfactant TX-100 and EDTA.
3. the restorative procedure of organic polluted soil according to claim 1, it is characterised in that：In the step b, remover booster
For acetone.
4. the restorative procedure of organic polluted soil according to claim 1, it is characterised in that：In the step e, adsorbent
For carbon-based material.
5. the restorative procedure of organic polluted soil according to claim 4, it is characterised in that：The adsorbent is that particulate is burnt
Powder, particulate coal dust, particulate semi-coke powder it is one or more.
6. the restorative procedure of organic polluted soil according to claim 1, it is characterised in that：In the step f, container bag
Group is made of multiple container bags, and the material of container bag is the non-woven fabrics that terylene, nylon fibre synthesize.
7. the restorative procedure of organic polluted soil according to claim 1, it is characterised in that：In the step g, flocculating agent
For ferric trichloride, flocculant is ferric-polysilicate.
8. the restorative procedure of organic polluted soil according to claim 1 or claim 7, it is characterised in that：In the step g, wadding
The addition of solidifying agent is 10-30g/t, and the addition of flocculating agent is 1-5g/t.
9. the restorative procedure of organic polluted soil according to claim 1, it is characterised in that：It is dry in the step h
When, drying temperature will be less than the volatilization temperature of pollutant.
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| CN201810461318.8A CN108723069A (en) | 2018-05-15 | 2018-05-15 | A kind of restorative procedure of organic polluted soil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109940034A (en) * | 2019-04-24 | 2019-06-28 | 河南省岩石矿物测试中心 | Method for repairing heavy metal contaminated soil by flotation |
| CN109985895A (en) * | 2019-03-14 | 2019-07-09 | 中国矿业大学 | Organic polluted soil prosthetic device and method |
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| CN109940034A (en) * | 2019-04-24 | 2019-06-28 | 河南省岩石矿物测试中心 | Method for repairing heavy metal contaminated soil by flotation |
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