CN207709528U - A kind of persistent organism contaminated site repair system - Google Patents
A kind of persistent organism contaminated site repair system Download PDFInfo
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- CN207709528U CN207709528U CN201721466434.6U CN201721466434U CN207709528U CN 207709528 U CN207709528 U CN 207709528U CN 201721466434 U CN201721466434 U CN 201721466434U CN 207709528 U CN207709528 U CN 207709528U
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- soil
- thermal desorption
- stirring rod
- desiccation
- repair system
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Abstract
The utility model is related to the technical field of site remediation more particularly to a kind of persistent organism contaminated site repair systems.Including sequentially connected soil desiccation device, soil grinding device, rotary kiln heating device and exhaust gas processing device, soil desiccation device includes tank body, motor and cast feeder, stirring rod is equipped in tank body, double-layer stirring fan leaf is provided on stirring rod, motor and stirring rod axis connection, exhaust gas processing device includes condensing unit, cyclone dust collectors and active carbon adsorber.The utility model is directed to the clay of high humility, so that it is dehydrated in advance using soil additive, moisture content is reduced, to save follow-up thermal desorption cost, and be added while activated carbon and iron powder catalyst so that the thermal desorption efficiency of POPs reaches 96% or more；Utilize soil grinding device so that thermal desorption temperature substantially reduces；The global design of pretreatment+thermal desorption+aftertreatment device, ensure that the feasibility of entire soil repair system.
Description
Technical field
The utility model is related to the technical field of site remediation more particularly to a kind of persistent organism contaminated site reparations
System.
Background technology
Soil is that the important natural resources that the mankind depend on for existence and development and animal, plant and microorganism give birth to jointly
The place deposit, lived.In recent years industrial and mineral activity especially three industrial wastes discharge under the influence of, various xenobiotic pollutants constantly into
Enter soil ecosystem, causes the soil pollution situation in China increasingly severe.
Persistent organism (Persistent Organic Pollutants, abbreviation POPs) is polluted, early stage once adopted
Use security landfill method as reparation means.Currently, the technology for repairing POPs contaminated soils is broadly divided into peripheral doses, chemical remediation
With biological prosthetic 3 class.Thermal desorption technology wherein in peripheral doses method is considered one of most efficient method, thermal desorption (heat
Parsing) technology is that the organic contamination component in soil is heated to sufficiently high temperature by way of directly or indirectly heating,
It is set to be volatilized into the process that gaseous state is detached with soil, the pollutant volatilized is collected or directly burns cracking.
Thermal desorption technology includes two basic processes：First stage heats pending substance, target contaminant is volatilized into
Gaseous state detaches；Second stage is discharged after processing to the standard such as being condensed, being collected and being burned by the tail gas containing pollutant
Into air.Studies have shown that thermal desorption technology is to the volatility such as PCDD/Fs, PCBs, PAHs, insecticide, oil, half volatile
Organic pollution and mercury contaminated soil have preferable repairing effect.Compared to other contaminated soil remediation technologies, thermal desorption skill
Art has many advantages, such as that pollutant process range is wide, processing speed is high, recycling mouthful of soil after reparation.Contain especially for PCBs
The generation that can significantly reduce two uh English is desorbed in chlorine organic pollution Low Temperature Thermal.
Typical thermal desorption device includes thermal desorption ontology facility and pollution air handling device.Thermal desorption ontology facility is used
In heating pending substance, pollutant is volatilized into after gaseous state from soil and is detached；Air pollution treatment facility will contain dirt
The gas treatment of object is contaminated to meeting discharge standard heel row to air.Specifically the gas treatment mode containing pollutant may be selected cold
Solidifying, absorption or burning etc. means.Due to the primarily discrete process of thermal desorption process, there are significant difference, thermal desorption with burning
High contaminant degradation rate is not pursued, but by heating means, so that pollutant is transferred to gas phase from solid phase, and to gas phase
Pollutant is handled.Since persistent organism such as PCBs boiling points are higher, thermal desorption needs higher heating temperature.Foreign countries are learned
Person's studies have shown that is increased with heating temperature, and PCBs release rates gradually rise in analog PCB s contaminated soils, and is reached at about 400 DEG C
To maximum value, release rate is close to 100%；Temperature is less than 150 DEG C, and PCBs release rates are extremely low.
According to the newest publication of U.S. EPA《Hyper-base gold site remediation reports (the 14th edition)》, 72 were shared in 1982~2011 years
A U.S.'s super fund project is using dystopy thermal desorption as main recovery technique.And dystopy thermal desorption technology is answered in China
With in the starting stage, have shown in a small amount of application case.Current foreign countries are about 100-300 for middle-size and small-size place processing cost
Dollar m-3.It is about 50 dollars of m for large-scale place processing cost-3：Domestic processing cost is about 600~2000 yuan of t-1。
The type of the soil texture, moisture content and pollutant can all generate processing cost certain influence.It is de- for heat
The cost of attached technology did investigation：It was found that moisture, pollutant kind, pollutant concentration and treating capacity are to influence cost
Main factor.Although to site remediation, there are many researchs both at home and abroad, to differing texture soil, different contaminants place
Understanding it is inadequate, the cost for resulting in thermal desorption recovery technique is high, especially high clay or the higher Pollution Field of humidity
Ground can increase processing cost, thus the pretreatment technology for developing different pollution type soil is the key that optimize technique or equipment.
Therefore, it is necessary to develop a kind of cost-effective, efficient persistent organism contaminated site repair system.
Utility model content
The purpose of this utility model is to provide a kind of persistent organism contaminated site repair system, solves in background technology
The problem of, this persistent organism contaminated site repair system repairing effect is good, at low cost and easy promotion and implementation.
To achieve the goals above, the technical solution of the utility model is：A kind of persistent organism contaminated site reparation
System, including sequentially connected soil desiccation device, soil grinding device, rotary kiln heating device and exhaust gas processing device, institute
The soil desiccation device stated includes tank body, motor and cast feeder, and stirring rod is equipped in the tank body, is arranged on the stirring rod
There is a double-layer stirring fan leaf, the motor and stirring rod axis connection, the rotary kiln heating device includes rotary furnace and combustion chamber,
The tail portion of the rotary furnace is provided with drawing mechanism, the exhaust gas processing device include condensing unit, cyclone dust collectors and
Active carbon adsorber.
The utility model has technical effect that：
(1) the utility model adds soil additive and composite catalyst by cast feeder, for the clay of high humility, profit
So that it is dehydrated in advance with soil additive, moisture content is reduced, to save follow-up thermal desorption cost, and activated carbon and iron powder
It is added while catalyst so that the thermal desorption efficiency of POPs reaches 96% or more；
(2) utilize soil grinding device that the soil after desiccation is crushed to the fine grained for 250 microns of grain size ＜ so that heat is de-
Enclosure temperature substantially reduces, to save heating cost；
(3) global design of pretreatment+thermal desorption+aftertreatment device, ensure that the feasible of entire soil repair system
Property, especially for the clay POPs contaminated site reparations of high humility, achieved the purpose that it is cost-effective, avoid secondary pollution.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model；
Reference numeral：10- soil desiccation devices；20- soil grinding devices；30- rotary kiln heating devices；At 40- tail gas
Manage device；11- tank bodies；12- motors；13- cast feeders；14- stirring rods；15- double-layer stirring fan leaves；31- rotary furnaces；32- burns
Room.
Specific implementation mode
With reference to attached drawing 1, a kind of persistent organism contaminated site repair system, it is characterised in that：Including sequentially connected
Soil desiccation device 10, soil grinding device 20, rotary kiln heating device 30 and exhaust gas processing device 40, the soil desiccation
Device 10 includes tank body 11, motor 12 and cast feeder 13, and stirring rod 14 is equipped in the tank body 11, is set on the stirring rod 14
It is equipped with double-layer stirring fan leaf 15, the motor 12 and 14 axis connection of stirring rod, the rotary kiln heating device 30 includes revolution
Stove 31 and combustion chamber 32, heating and temperature control heat 60min within the scope of 200-250 DEG C, that is, have reached preferable thermal desorption effect
Fruit, the desorption efficiency of POPs reach 96% or more, and the tail portion of the rotary furnace 31 is provided with drawing mechanism, at the tail gas
It includes condensing unit, cyclone dust collectors and active carbon adsorber to manage device 40, can cause secondary pollution to avoid tail gas and dust,
It is absorbed and is purified.
Wherein soil additive and catalyst are added into the soil being stirred for cast feeder 13, and additive includes certain ratio
Bentonite, aluminium polychloride, chitosan and the calcium carbonate of example.Aluminium polychloride is added and has played charge neutrality effect, destroys height and contains
The stability of water rate clay, and bentonite and chitosan enhance the ability of charge neutrality, the two collaboration plays bridge formation and net catches work
With, calcium carbonate contributes to the precipitation of solid, so achieving fine dehydrating effect, the soil mixture of formation has porosity,
Mud cake is solid.Catalyst is Powdered Activated Carbon and iron powder.In order to ensure sufficiently high desorption and degradation efficiency, should subtract as far as possible
Energy consumption in few desorption process, is reduced cost, can be promoted desorption and the degradation of POPs using catalyzing cooperation desorption, specifically
Zeroth order nanometer iron powder and activated carbon is added.Wherein, adding the soil texture after iron powder becomes loose, it is easier to the de- of POPs occur
It is attached, and desorption effect is more notable at a lower temperature.
Preferably, the soil after desiccation is ground into fine grained by the soil grinding device 20, and the grain size of the particle is small
In or equal to 250 microns.The grain size of soil is smaller, and specific surface area is bigger, is more conducive to the thermal desorption of soil.Fine grained with it is thick
Particle is compared, and when obtaining identical thermal desorption effect, the heating temperature of fine grained soil is lower.
Basic principles, main features, and advantages of the present invention has been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the present utility model is not limited to the above embodiments, described in above embodiments and description
Only the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model the utility model also have respectively
Kind changes and improvements, these changes and improvements are both fallen in claimed the scope of the utility model.The requires of the utility model
Protection domain defined by appended claims and its equivalent.
Claims (2)
1. a kind of persistent organism contaminated site repair system, it is characterised in that：Including sequentially connected soil desiccation device
(10), soil grinding device (20), rotary kiln heating device (30) and exhaust gas processing device (40), the soil desiccation device
(10) include tank body (11), motor (12) and cast feeder (13), stirring rod (14), the stirring are equipped in the tank body (11)
Double-layer stirring fan leaf (15) is provided on bar (14), the motor (12) and stirring rod (14) axis connection, the rotary kiln add
Thermal (30) includes rotary furnace (31) and combustion chamber (32), and the tail portion of the rotary furnace (31) is provided with drawing mechanism, institute
The exhaust gas processing device (40) stated includes condensing unit, cyclone dust collectors and active carbon adsorber.
2. a kind of persistent organism contaminated site repair system according to claim 1, it is characterised in that：The soil
Soil after desiccation is ground into fine grained by grinding device (20), and the grain size of the particle is less than or equal to 250 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721466434.6U CN207709528U (en) | 2017-11-07 | 2017-11-07 | A kind of persistent organism contaminated site repair system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721466434.6U CN207709528U (en) | 2017-11-07 | 2017-11-07 | A kind of persistent organism contaminated site repair system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207709528U true CN207709528U (en) | 2018-08-10 |
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ID=63061198
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| CN201721466434.6U Active CN207709528U (en) | 2017-11-07 | 2017-11-07 | A kind of persistent organism contaminated site repair system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109290352A (en) * | 2018-08-27 | 2019-02-01 | 深圳市环境监测中心站 | A kind of thermal desorption repair process device and method of POPs contaminated soil |
| CN109848197A (en) * | 2019-01-04 | 2019-06-07 | 北京坤达胜源环境科技有限公司 | A kind of thermal desorption repair system of organic material contaminated soil |
| CN112691755A (en) * | 2020-12-07 | 2021-04-23 | 生态环境部南京环境科学研究所 | Ectopic thermal desorption treatment method based on thermal desorption auxiliary agent |
| CN114871264A (en) * | 2022-06-02 | 2022-08-09 | 天津中材工程研究中心有限公司 | Treatment system and method for polychlorinated biphenyl-containing pollutants |
-
2017
- 2017-11-07 CN CN201721466434.6U patent/CN207709528U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109290352A (en) * | 2018-08-27 | 2019-02-01 | 深圳市环境监测中心站 | A kind of thermal desorption repair process device and method of POPs contaminated soil |
| CN109290352B (en) * | 2018-08-27 | 2020-11-06 | 深圳市环境监测中心站 | Thermal desorption remediation treatment device and method for POPs contaminated soil |
| CN109848197A (en) * | 2019-01-04 | 2019-06-07 | 北京坤达胜源环境科技有限公司 | A kind of thermal desorption repair system of organic material contaminated soil |
| CN112691755A (en) * | 2020-12-07 | 2021-04-23 | 生态环境部南京环境科学研究所 | Ectopic thermal desorption treatment method based on thermal desorption auxiliary agent |
| CN112691755B (en) * | 2020-12-07 | 2022-04-12 | 生态环境部南京环境科学研究所 | Ectopic thermal desorption treatment method based on thermal desorption auxiliary agent |
| CN114871264A (en) * | 2022-06-02 | 2022-08-09 | 天津中材工程研究中心有限公司 | Treatment system and method for polychlorinated biphenyl-containing pollutants |
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