CN110314929A - Sulfa antibiotics contaminated soil indirect thermal desorption processing method - Google Patents
Sulfa antibiotics contaminated soil indirect thermal desorption processing method Download PDFInfo
- Publication number
- CN110314929A CN110314929A CN201910643999.4A CN201910643999A CN110314929A CN 110314929 A CN110314929 A CN 110314929A CN 201910643999 A CN201910643999 A CN 201910643999A CN 110314929 A CN110314929 A CN 110314929A
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- Prior art keywords
- thermal desorption
- contaminated soil
- sulfa antibiotics
- soil
- kiln
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Classifications
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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
- B09C1/06—Reclamation of contaminated soil thermally
-
- 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
Abstract
The invention discloses a kind of sulfa antibiotics contaminated soil indirect thermal desorption processing methods, by sulfa antibiotics contaminated soil it is preprocessed after, it sequentially enters in low temperature thermal desorption kiln and high temperature thermal desorption kiln, evaporation or degradation enter tail gas after pollutant is heated, tail gas discharges after catalytic degradation and absorption, achievees the effect that completely remove pollutant in soil.The present invention effectively eliminates the sulfa antibiotics in soil, reduces energy consumption by being classified thermal desorption, and do not generate secondary pollution.Advantage is prominent in terms of contamination control in contaminated soil remediation effect and treatment process by the present invention, is suitble to large-scale popularization.
Description
Technical field
The invention belongs to technical field of soil remediation, indirect in particular to a kind of sulfa antibiotics contaminated soil
Thermal desorption processing method.
Background technique
In recent years, antibiotic pollution is increasingly taken seriously and pays close attention in soil, it has also become one of international research hot spot.It is anti-
Raw element is one of maximum drug of dosage in the world, and China's antibiotic usage amount is surprising, accounts for about the half of world's dosage, wherein
52% is used for livestock culture industry, and 48% uses for people, is discharged into soil and water resources per year over 50000 tons of antibiotic.It is most of
Antibiotic cannot be absorbed by organisms completely, and 85% or more antibiotic is discharged into environment by poultry fecaluria or patient, through different approaches pair
Soil and water body pollute.Soil is the important ownership place of antibiotic, and the physicochemical property of antibiotics is more stable,
And have certain inhibiting effect to microbial activities, therefore be persistent pollutant, it is easy to accumulate or be absorbed by plants in the soil,
The growth and development of plant and its absorption to nitrogen, phosphorus, potassium element are influenced, and then enters food chain and threatens human health.Antibiotic
Residual quantity in soil environment is generally at g/kg grades of μ, and some areas are up to mg/kg or g/kg grades.Wherein sulfa antibiotics
It is more common a kind of antibiotic in livestock and poultry cultivation and aquaculture.
Currently, the main restorative procedure of sulfa antibiotics contaminated soil is to have been provided by constantly screening with enriching and purifying
The engineering bacteria for sulfa antibiotics ability of degrading.Such as patent document " one plant of sulfa antibiotics degradation bacteria and its application
(201810297357.9) " saccharomycete (Sakaguchia cladiensis) the A5 bacterial strain and a kind of patent " antibiosis filtered out
The arthrobacterium Arthrobacter sp. that plain degradation mix bacterium agent and its application (201810464767.8) " filters out.These sides
Method all be using microorganism as degrade the main force, however microorganism exist in actual use it is complicated for operation, to existence
The outstanding problems such as environmental suitability difference and degradation efficiency are low.In view of the environmental risk and public safety of sulfa antibiotics,
Highly efficient contaminated soil processing method is developed, there is good social benefit and environmental benefit.
Summary of the invention
It is an object of the invention to solve the above-mentioned problems of the prior art, and then provide a kind of indirect thermal desorption processing
The method for repairing sulfa antibiotics contaminated soil.
Realizing the specific technical solution of the object of the invention is:
A kind of sulfa antibiotics contaminated soil indirect thermal desorption processing method, sulfa antibiotics contaminated soil is located in advance
After reason, low temperature thermal desorption kiln and high temperature thermal desorption kiln are passed sequentially through, the pollutant in soil is evaporated or degraded, thermal desorption
The tail gas generated in the process qualified discharge after catalytic degradation and absorption, specifically includes the following steps:
(1) pre-treatment step: sulfa antibiotics contaminated soil is screened, broken, adjusting moisture content removes iron operation
Afterwards, pretreated contaminated soil is obtained.
Wherein, the sulfa antibiotics include sulphadiazine, sulfamethazine, 5-methoxysulfadiazine, sulfanilamide (SN)
First oxazole.
Wherein, the screening is completed by soil screening machine, using the relative motion of bulk granular material and compass screen surface, makes partial particulate
Through sieve pore, the materials such as sand, gravel, rubble are divided into different stage by granular size, to complete to sieve.
Wherein, the soil breaking is completed by soil crusher, enters crushing chamber by the contaminated soil that Belt Conveying comes
Afterwards, crushing is played by crushing hammering.
Wherein, the partial size of the pretreated contaminated soil is less than 30mm, and moisture content is less than 20%.
The present invention uses moisture content higher than 20% contaminated soil and turns over the even rear method of natural air drying for a period of time, into
And obtain contaminated soil of the moisture content less than 20%.
Wherein, described except iron can be completed by the iron remover with magnetic separation function.
Purpose of the size controlling of contaminated soil in 30mm is made contaminated soil in thermal desorption kiln by the present invention
It is heated evenly.
The moisture content of contaminated soil is adjusted to be because the heated volatilization of moisture can consume a large amount of heat less than 20% by the present invention
Amount.For the efficiency for guaranteeing thermal desorption, the moisture content preferably less than 20% of soil is fed.
(2) by charging metering system, step (1) pretreated contaminated soil is initially entered into low temperature thermal desorption kiln
Furnace, subsequently into high temperature thermal desorption kiln, finally from high temperature thermal desorption treated soil by discharging device, after moistening and lowering temperature
Obtain the qualified soil of processing.
In step (2), the temperature of low temperature thermal desorption kiln is set in 120-150 DEG C, and contaminated soil is in residing time in furnace
For 30-60min；Preferably, the temperature of low temperature thermal desorption kiln is set in 150 DEG C, and contaminated soil is in residing time in furnace
60min。
In step (2), the temperature of high temperature thermal desorption kiln is set in 300-350 DEG C, and contaminated soil is in residing time in furnace
For 30-60min；Preferably, the temperature of high temperature thermal desorption kiln is set in 350 DEG C, and contaminated soil is in residing time in furnace
60min。
In step (2), after thermal desorption is handled, sulfa antibiotics removal rate can achieve 99% or more.
In step (2), moisture content is between 10%-15% after the humidified cooling of soil；It preferably, is 15%.
Wherein, the revolving speed of the low temperature thermal desorption kiln and high temperature thermal desorption kiln and unit time processing amount of soil and heat
Effective heated length that kiln is desorbed is related.
Low temperature thermal desorption kiln and high temperature thermal desorption kiln of the present invention is jacket type structure, including inner barrel and outer barrel, resistance to
Soak cotton is covered on the inner surface of outer cylinder, and heat tape is ordered in heat-preservation cotton surface, and inner cylinder is that rotary kiln form exists
Internal rotating guarantees that contaminated soil is heated evenly, wherein the revolving speed of rotary kiln is 5-10r/min.It preferably, is 10r/min.
Wherein, step (1) pretreated contaminated soil enters low temperature thermal desorption kiln, the moisture contained in soil and boiling
The lower organic pollutant of point, which is heated indirectly, to be evaporated, and enters in tail gas.Meanwhile the contaminated soil through desiccation is from low temperature
The outlet of thermal desorption kiln drops down onto high temperature thermal desorption kiln.
Wherein, it is described from low temperature thermal desorption kiln come out after " contaminated soil of desiccation " refer specifically in low temperature thermal desorption kiln
The soil of moisture is stripped of in furnace.
Due at this stage there is no the standard of residual antibiotic concentration in relevant soil, thus it is " qualified soil " of the invention
Refer to the soil that sulfa antibiotics removal effect is ideal after handling by the method for the invention, and passes through experimental verification, warp
Pollutants removal rate reaches 99% or more in the contaminated soil of thermal desorption processing, and effect is obvious.
It is a kind of completely new restorative procedure that indirect thermal desorption is classified for sulfa antibiotics contaminated soil.Existing skill
The stability of reparation sulfamido contaminated soil is poor in art, the period is long, effect is not ideal enough.Using the side of present invention classification thermal desorption
Formula effect is obvious.In addition, the present invention is classified the exploration and thermal desorption tail that the main technological difficulties of thermal desorption are thermal desorption parameter
The purification and processing of gas.
(3) condenser is initially entered from the tail gas that low temperature thermal desorption kiln comes out, after condensing, further uses cloth bag
Deduster I, is filtered dust present in tail gas, later the higher temperature of this strand of air-flow and the outflow of high temperature thermal desorption kiln
Tail gas mixing, flow into catalytic degradation unit, thus by organic pollutant catalytic degradation in tail gas.
In step (3), cellular transition metal oxide type catalyst V is installed in the catalytic degradation unit2O5-
WO3/TiO2, remove in tail gas 99% or more hydro carbons and benzene homologues.
In step (3), the organic pollutant that vapor and boiling point in tail gas are higher than 40 DEG C is removed in the condenser.
The purpose that the present invention handles the tail gas come out from low temperature thermal desorption kiln through solidifying cooler and bag filter I are as follows:
The moisture in soil is steamed first, heats moisture again in order not to allow the flue gas for having moisture to enter high temperature thermal desorption kiln
Bigger energy loss is caused, therefore removes moisture removal through condenser, and through I dedusting of bag filter, and high temperature thermal desorption kiln goes out
The flue gas come need to only be directly entered cyclone dust collectors without moisture.
Traditional thermal desorption processing unit only realizes the transfer of pollutant by the way of activated carbon adsorption pollutant,
And exhaustive oxidation degradation of the pollutant in repair process is not implemented；And in such a way that removal organic matter is burnt in dual firing chamber, then
It needs to consume mass energy, causes unnecessary energy dissipation.Thorough oxygen of the catalytic degradation technology because being able to achieve organic pollutant
Change degradation, it is considered to be a kind of most potential control technology, gating catalytic oxidation edman degradation Edman of the present invention have reaction temperature low,
Energy consumption is small, it can be achieved that the advantages that exhaustive oxidation is degraded.
(4) tail gas after catalytic degradation further uses activated carbon adsorption, realizes the thorough removing of organic pollutant.Together
When, it is for re-filtering to the dust in tail gas using bag filter II, further strengthen the purification process of pollutant.
(rotation speed determines dirt to the temperature of control thermal desorption kiln with thermal desorption kiln rotation speed in above method
Contaminate soil in the residence time in thermal desorption kiln) and tail gas catalytic degradation and purification for the indirect thermal desorption of the present invention at
The method that reason repairs sulfa antibiotics contaminated soil is vital.
Compared with prior art, beneficial effects of the present invention: present invention benefit thermally handles sulfamido contaminated soil
There is higher stability, better treatment effect, shorter process cycle compared with degradation bacteria technology.The present invention is to Polluted Soil
Earth carries out progressive solution, and low temperature thermal desorption kiln mainly realizes the drying process of contaminated soil, reduces the moisture content of soil, avoid
Moisture, because being heated at high temperature, and causes unnecessary energy loss in subsequent process.The present invention is real by the way of catalytic degradation
Exhaustive oxidation degradation of the existing pollutant in repair process, does not generate secondary pollution.The high temperature thermal desorption process that the present invention uses
Required temperature is only 300-350 DEG C, 99% removal rate of pollutant may be implemented, and at this temperature, entire treatment process
Influence to soil is smaller.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
In conjunction with following specific embodiments and attached drawing, the present invention is described in further detail, protection content of the invention
It is not limited to following embodiment.Without departing from the spirit and scope of the invention, those skilled in the art it is conceivable that change
Change and advantage is all included in the present invention, and using appended claims as protection scope.Implement process of the invention,
Condition, reagent, experimental method etc. are among the general principles and common general knowledge in the art in addition to what is specifically mentioned below,
There are no special restrictions to content by the present invention.
Fig. 1 is flow chart of the present invention.A kind of indirect thermal desorption of sulfa antibiotics contaminated soil involved in the present embodiment
Processing method, comprising the following steps:
One, contaminated soil it is screened, it is broken, adjust moisture content, except after iron pretreatment operation, contaminated soil partial size is less than
30mm, moisture content is less than 20%.
Two, by feeding metering system, the contaminated soil in step 1 initially enters low temperature thermal desorption kiln, by Low Temperature Thermal
The temperature of desorption kiln is set in 120-150 DEG C, and contaminated soil is 30-60min in residing time in furnace.The water contained in soil
Divide and the lower organic pollutant of boiling point is heated indirectly and is evaporated, enters in tail gas.Meanwhile the contaminated soil through desiccation
High temperature thermal desorption kiln entrance is dropped down onto from the outlet of low temperature thermal desorption kiln, the temperature of high temperature thermal desorption kiln is set in 300-
350 DEG C, contaminated soil is 30-60min in residing time in furnace.
Three, condenser is initially entered from the tail gas that low temperature thermal desorption kiln comes out, removes vapor and boiling point in tail gas
Organic pollutant higher than 40 DEG C.
Four, after condensing, further use bag filter I, dust present in tail gas be filtered, later this
Stock air-flow is mixed with the tail gas for the higher temperature that high temperature thermal desorption kiln flows out, and inflow is equipped with honeycomb V2O5-WO3/TiO2It urges
The catalytic degradation unit of agent, thus by organic pollutant catalytic degradation in tail gas.
Five, the tail gas after catalytic degradation further uses activated carbon adsorption, realizes the thorough removing of organic pollutant.Together
When, it is for re-filtering to the dust in tail gas using bag filter II, further strengthen the purification process of pollutant.
Six, high temperature thermal desorption treated soil obtains the qualified soil of processing after moistening and lowering temperature by discharging device.
In step 4, the V2O5-WO3/TiO2The content of vanadium of catalyst is 5wt.%, W content 10wt.%.
In step 6, by the way of water cooling, the clean soil moisture content after controlling spray cooling is between 10%-15%.
Embodiment 1
In certain sulfa antibiotics contaminated soil remediation project, using indirect thermal desorption repair system pair shown in FIG. 1
(sulfa antibiotics include sulphadiazine, sulfamethazine, 5-methoxysulfadiazine, sulphur to soil containing sulfa antibiotics
Amine first oxazole) it is disposed, setting heating temperature is 300 DEG C, is by adjusting rotary kiln revolving speed control residence time of material
60min.After the disposition of this set system, the concentration of sulfa antibiotics contained by it is sampled and surveyed to sample out, as a result such as following table
It is shown.
Each antibiotic content analyzes result before and after the indirect thermal desorption of 1 sulfa antibiotics contaminated soil of table
From in 1 data of table it can be seen that the thermal desorption discharging in each antibiotic content be reduced to 0.8mg/kg hereinafter, antibiosis
Plain removal rate is up to 99% or more.
And the benefit mentioned in patent document " one plant of sulfa antibiotics degradation bacteria and its application (201810297357.9) "
It also can only achieve within nine days general 50% treatment effect with the processing of saccharomycete (Sakaguchia cladiensis) A5 bacterial strain, and
The present invention can achieve 99% or more for 60 minutes, and microorganism growth conditions is stringent, and stability is poor.It can be said that Ming Benfa
Thermally processing sulfamido contaminated soil has higher stability, preferably processing effect to bright benefit compared with degradation bacteria technology
The advantages that fruit, shorter process cycle.
Protection content of the invention is not limited to above embodiments.Without departing from the spirit and scope of the invention, originally
Field technical staff it is conceivable that variation and advantage be all included in the present invention, and with appended claims be protect
Protect range.
Claims (9)
1. a kind of sulfa antibiotics contaminated soil indirect thermal desorption processing method, which is characterized in that by sulfa antibiotics dirt
Contaminate soil pretreatment after, pass sequentially through low temperature thermal desorption kiln and high temperature thermal desorption kiln, by soil pollutant evaporation or
Degradation, the tail gas that thermal desorption generates in the process qualified discharge after catalytic degradation and absorption, specifically includes the following steps:
(1) pre-treatment step: sulfa antibiotics contaminated soil is screened, broken, adjusting moisture content after operating except iron, obtains
To pretreated contaminated soil；
(2) by charging metering system, step (1) pretreated contaminated soil is initially entered into low temperature thermal desorption kiln, so
Enter high temperature thermal desorption kiln afterwards, finally from the high temperature thermal desorption treated soil by discharging device, after moistening and lowering temperature
Obtain the qualified soil of processing；
(3) condenser is initially entered from the tail gas that the low temperature thermal desorption kiln comes out, after condensing, further uses cloth bag
Deduster I, is filtered dust present in tail gas, this strand of air-flow flows out higher with the high temperature thermal desorption kiln later
The tail gas of temperature mixes, and catalytic degradation unit is flowed into, thus by organic pollutant catalytic degradation in tail gas；
(4) tail gas after the step (3) catalytic degradation further uses activated carbon adsorption, realizes the thorough of organic pollutant
Removing；Meanwhile it is for re-filtering to the dust in tail gas using bag filter II, further strengthen the cleaned of pollutant
Journey.
2. sulfa antibiotics contaminated soil indirect thermal desorption processing method as described in claim 1, which is characterized in that step
(1) in, the sulfa antibiotics include sulphadiazine, sulfamethazine, 5-methoxysulfadiazine, sulfamethoxazole.
3. sulfa antibiotics contaminated soil indirect thermal desorption processing method as described in claim 1, which is characterized in that step
(1) in, the partial size of the pretreated contaminated soil is less than 30mm, and moisture content is less than 20%.
4. sulfa antibiotics contaminated soil indirect thermal desorption processing method as described in claim 1, which is characterized in that step
(1) in, the revolving speed of the low temperature thermal desorption kiln and the rotary kiln in high temperature thermal desorption kiln is 5-10r/min.
5. sulfa antibiotics contaminated soil indirect thermal desorption processing method as described in claim 1, which is characterized in that step
(2) in, the temperature of the low temperature thermal desorption kiln is set in 120-150 DEG C, and contaminated soil is 30- in residing time in furnace
60min。
6. sulfa antibiotics contaminated soil indirect thermal desorption processing method as described in claim 1, which is characterized in that step
(2) in, the temperature of the high temperature thermal desorption kiln is set in 300-350 DEG C, and contaminated soil is 30- in residing time in furnace
60min。
7. sulfa antibiotics contaminated soil indirect thermal desorption processing method as described in claim 1, which is characterized in that through heat
After desorption processing, sulfa antibiotics removal rate can achieve 99% or more.
8. sulfa antibiotics contaminated soil indirect thermal desorption processing method as described in claim 1, which is characterized in that step
(3) in, moisture content is between 10%-15% after the humidified cooling of soil.
9. sulfa antibiotics contaminated soil indirect thermal desorption processing method as described in claim 1, which is characterized in that step
(3) in, cellular transition metal oxide type catalyst V is installed in the catalytic degradation unit2O5-WO3/ TiO2, removal
99% or more hydro carbons and benzene homologues in tail gas.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110586636A (en) * | 2019-10-12 | 2019-12-20 | 上海松沅环境修复技术有限公司 | Method and system for indirect thermal desorption treatment of tetracycline antibiotic contaminated soil |
| CN111872093A (en) * | 2020-06-16 | 2020-11-03 | 江苏省环境科学研究院 | Method for restoring petroleum hydrocarbon polluted soil |
| CN112317529A (en) * | 2020-11-09 | 2021-02-05 | 上海交通大学 | Chemical stabilization/high-temperature immobilization restoration method for organic arsenic contaminated soil in breeding industry |
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| CN104096709A (en) * | 2014-07-04 | 2014-10-15 | 北京高能时代环境技术股份有限公司 | Thermal desorption device for repairing mercury-polluted soil |
| CN109078975A (en) * | 2018-07-16 | 2018-12-25 | 北京建工环境修复股份有限公司 | A kind of contaminated soil is classified indirect thermal desorption coupling and catalyzing degradation repair system and method |
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2019
- 2019-07-17 CN CN201910643999.4A patent/CN110314929A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104096709A (en) * | 2014-07-04 | 2014-10-15 | 北京高能时代环境技术股份有限公司 | Thermal desorption device for repairing mercury-polluted soil |
| CN109078975A (en) * | 2018-07-16 | 2018-12-25 | 北京建工环境修复股份有限公司 | A kind of contaminated soil is classified indirect thermal desorption coupling and catalyzing degradation repair system and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110586636A (en) * | 2019-10-12 | 2019-12-20 | 上海松沅环境修复技术有限公司 | Method and system for indirect thermal desorption treatment of tetracycline antibiotic contaminated soil |
| CN111872093A (en) * | 2020-06-16 | 2020-11-03 | 江苏省环境科学研究院 | Method for restoring petroleum hydrocarbon polluted soil |
| CN112317529A (en) * | 2020-11-09 | 2021-02-05 | 上海交通大学 | Chemical stabilization/high-temperature immobilization restoration method for organic arsenic contaminated soil in breeding industry |
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