CN203091406U - Reactor for treating contaminated soil with low-temperature plasma and photocatalysis - Google Patents
Reactor for treating contaminated soil with low-temperature plasma and photocatalysis Download PDFInfo
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- CN203091406U CN203091406U CN2012207251948U CN201220725194U CN203091406U CN 203091406 U CN203091406 U CN 203091406U CN 2012207251948 U CN2012207251948 U CN 2012207251948U CN 201220725194 U CN201220725194 U CN 201220725194U CN 203091406 U CN203091406 U CN 203091406U
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- temperature plasma
- photocatalysis
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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 utility model discloses a reactor for treating contaminated soil with low-temperature plasma and photocatalysis. The reactor comprises a reaction cylinder, wherein two ends of the reaction cylinder are respectively provided with an air inlet and an air outlet; the reaction cylinder is divided into two sections along the axial direction, wherein one section close to the air inlet is a low-temperature plasma reaction section, and the other section close to the air outlet is a photocatalysis reaction section; a vortex generator is arranged at the air inlet; and an airflow uniform distribution device is arranged on a junction of the low-temperature plasma reaction section and the photocatalysis reaction section. The contaminated soil is firstly subjected to a discharging reaction in the low-temperature plasma reaction section and then subjected to primary degradation; residual organic matters volatilized from the soil are led into the photocatalysis reaction section to be subjected to a photocatalysis reaction; and through synergetic degradation of the low-temperature plasma reaction section and the photocatalysis reaction section, organic pollutants in the soil are effectively removed, and secondary pollutants are few.
Description
Technical field
The utility model relates to the technical field that a kind of contaminated soil is handled, and especially relates to a kind of reactor of low-temperature plasma synergistic photocatalysis treatment contaminated soil.
Background technology
Soil is the material base that the mankind depend on for existence, is indispensable, non-renewable natural resources.The production of a large amount of chemical products causes soil pollution more and more serious, has caused the organic matter of organic enrichment, especially volatile organic matter (VOCs) in the soil, polycyclic aromatic hydrocarbon (PAHs), persistent organism difficult degradations such as (POPs).VOCs, PAHs and POPs have " three cause " effect, and can produce photic toxic effect, have in soil that latent fraud is big, grow incubation period, involve a wide range of knowledge, administer characteristics such as difficulty, as untimely removal, with serious threat food security and health.How a large amount of residual organic pollutions in the soil are repaired fast and effectively and become the technical barrier of needing solution badly.
Traditional restorative procedure of organic material contaminated soil has oxidizing fire, thermal desorption, chemistry reparation, physics reparation, biological restoration, gas phase extraction process etc.Wherein strange land oxidizing fire method and thermal desorption method are used more.But firing method can produce secondary pollutions such as bioxin in the process that soil is burned, will cause more severe contamination to atmosphere.Thermal desorption has then only carried out the simple physics separation, is another phase with pollutant from an inversion of phases, organic pollution is not played basic destruction, organic pollution thoroughly can not be degraded, therefore all there are some limitation in traditional organic material contaminated soil restorative procedure.
Plasma technique and photocatalysis technology are the hot spot technologies that the gaseous contaminant that occurs is in recent years administered the field.Than traditional air purifying process, plasma technique has characteristics such as handling process is short, efficient is high, energy consumption is low, applied widely, especially low temperature plasma (NTP) can produce a lot of highly active particles (as electronics, active group etc.), react with the organic pollution of difficult degradation, make its conversion or be decomposed into innocuous substance.Photocatalysis technology then has advantages such as energy consumption is low, simple to operate, reaction condition is gentle, secondary pollution is few.The both is considered to a kind of environmental pollution advanced purification technology that has future.These two kinds of purification techniques are effective in having become the new research direction in Air Pollution Control field.
Plasma technique and photocatalysis technology are applied in the process field of contaminated soil gradually, publication number be CN102671526A patent disclosure a kind of device with Low Temperature Plasma Treating soil volatile organic contaminant, the volatile organic contaminant that this device utilizes hot blast will be adsorbed in the soil disengages, hot blast carries volatile organic contaminant and enters in the reaction of low temperature plasma device by pipeline, utilize the active particle of low-temperature plasma generator discharge generation to handle volatile organic contaminant, this processing mode only adopts lower temperature plasma technology to handle organic pollution, can not single treatment complete, need to adopt the mode of handling repeatedly could remove volatile organic contaminant fully, the energy consumption height easily produces secondary pollution.
Publication number be CN102553901A patent disclosure a kind of photocatalysis soil sanitation system, this system is made up of soil heater, water back and non-woven cloth layer, be covered with titanium dioxide and adsorbent mixed layer, transparent film layer on the non-woven cloth layer successively, this system utilizes light-catalyzed reaction can remove chloride in the soil, but the part pollutant that comes out by heated volatile in the soil is only removed in light-catalyzed reaction, treatment effect is not good, can pollute the necessarily residual of thing.
The utility model content
The utility model is at having problems such as reactor for treatment weak effect, the secondary pollution of handling organic pollution in the soil are big now, a kind of reactor of low-temperature plasma synergistic photocatalysis treatment contaminated soil is provided, carry out the efficient processing of organic material contaminated soil, reduce it second environmental pollution.
A kind of reactor of low-temperature plasma synergistic photocatalysis treatment contaminated soil, comprise that two ends are provided with the reacting cylinder body of air inlet and gas outlet respectively, described reacting cylinder body is divided into two sections vertically, wherein a section near air inlet is the reaction of low temperature plasma section, and one section of close gas outlet is the light-catalyzed reaction section.
Contaminated soil is after the single treatment of reaction of low temperature plasma section process, the remaining organic matter that volatilizes enters the light-catalyzed reaction section and carries out after-treatment, this reactor has been broken through traditional reactor and has only been adopted single defective of planting the technical finesse contaminated soil, lower temperature plasma technology is combined with photocatalysis technology, give full play to both associated treatment effects, the contaminated soil treatment effect is good, and secondary pollution is low.The active material ozone that the reaction of low temperature plasma section produces can decompose in the photocatalysis stage, not only solve the problem that simple low temperature plasma produces accessory substances such as ozone, and the decomposition of ozone can improve photocatalysis performance, promoted organic degree of depth degraded.
The cross section of described reacting cylinder body is square, for the strengthening flow disturbance, increases the air-flow time of staying, improves the treatment effect of reaction of low temperature plasma section, and described air inlet place is provided with vortex generating means, and preferred vortex generating means is an eddy flow plate form.
Subsequently, in order to eliminate the eddy current that the reaction of low temperature plasma section produces, make air-flow enter the light-catalyzed reaction section uniformly, improve the degradation effect of light-catalyzed reaction section pollutant, described reaction of low temperature plasma section and light-catalyzed reaction section intersection are provided with airflow uniform distribution device, and preferred airflow uniform distribution device is the corrosion resistant plate of loose structure.
In the described reaction of low temperature plasma section being oppositely arranged arranged and be close to the upper strata metallic conduction plate and the lower metal conductive plate of reacting cylinder body inwall, upper strata metallic conduction plate surface attachment metal tip object, ground connection is as discharge anode, and the lower metal conductive plate connects negative high voltage as the discharge negative electrode; The material of preferred reaction cylindrical shell is a high-strength insulating material, and the conductive plate material is a stainless steel; Because the discharging gap of corona discharge reaches as high as about 600mm, guaranteed to place enough spaces of contaminated soil, so the preferred corona discharge of the utility model is the discharge mode of reaction of low temperature plasma section.
In corona discharge process, discharging gap is directly determining the development of time corona, discharging gap is big more, discharge is also just difficult more, it is also just high more to form the required voltage of time corona, in order better to produce strong time corona, promotes the generation of active material in the utility model, consider the performance issue of existing high voltage source and the thickness of handling soil simultaneously, the spacing of preferred described upper strata metallic conduction plate and lower metal conductive plate is 50～100mm;
The metal tip thing is arranged many more, time corona zone is big more, help the generation of active material, still, the metal tip thing is overstocked, cause the interference of each region of discharge easily, form inaccessible phenomenon of time, so, in order to improve the energy efficiency of corona discharge, the length of the metal tip object of preferred described upper strata metallic conduction plate surface attachment is 5～10mm, and spacing is 10～15mm.
In the described light-catalyzed reaction section cross section photocatalysis thin plate and ultraviolet tube group are set, photocatalysis thin plate and ultraviolet tube group are provided with along the cylindrical shell axially spaced-apart, and multilayer can be set; The light-catalyzed reaction section should be reserved the position of photocatalysis thin plate, the number of plies of determining the photocatalysis thin plate according to the kind and the concentration of organic pollution in the soil; Described ultraviolet tube group is made up of along the cylindrical shell arranged radially several ultraviolet tubes.
Described photocatalysis thin plate is by tabular carrier and load on supported catalyst and form, aspect photochemical catalyst, and TiO
2Causing concern widely, suspended phase TiO aspect pollutant waste water and the air cleaning with its excellent photocatalysis performance
2Photochemical catalyst easily condenses in water, inactivation, and the penetration power of light is obstructed, and TiO
2Film photocatalyst then can effectively be avoided this point, so described catalyst is TiO
2, described carrier is a ceramic honey comb.
The preparation of photocatalysis thin plate is that predecessor, absolute ethyl alcohol are that solvent, hydrochloric acid are that hydrolysis inhibitor, ceramic honey comb are carrier with the butyl titanate, and the ceramic honey comb material adopts porous cordierite, and its hole density is 400 ducts, wall thickness 0.2～0.5mm per square inch.At first dispose TiO
2Colloidal sol is put into TiO with the ceramic honey comb finished product
2After biofilm is finished in the colloidal sol, half-finished product plate is put into the Muffle furnace calcining finish.
Pending contaminated soil homogeneous reactor is put on the lower metal conductive plate of reaction of low temperature plasma section, from the air inlet bubbling air, the reaction of low temperature plasma section is connected power supply and is carried out exoelectrical reaction, air ionization is produced low temperature plasma (particularly high energy electron and strong oxidizing property free radical), organic pollution generation electron collision and radical reaction in low temperature plasma and the soil, the part organic pollution is broken down into innocuous substance, remaining not, the organic pollution of complete reaction will evaporate with gaseous material, and pass through airflow uniform distribution device, evenly enter the light-catalyzed reaction section and carry out further light-catalyzed reaction, under photocatalysis, finally be oxidized to CO
2And H
2Innocuous substances such as O can effectively be removed the organic pollution in the soil, reduce secondary pollution.
Compared with prior art, the beneficial effect that the utlity model has:
The utility model combines lower temperature plasma technology with photocatalysis technology, give full play to both synergies, shortened the degradation time of organic pollution in the soil, improved its degradation effect, made the organic pollution exhaustive oxidation in the soil be decomposed into harmless CO
2And H
2O can not cause secondary pollution to environment, efficiently solves an improvement difficult problem that contains organic pollution soil.
Description of drawings:
Fig. 1 is the structural representation of the reactor of low-temperature plasma synergistic photocatalysis treatment contaminated soil;
Fig. 2 is the A-A profile of reactor shown in Figure 1;
Fig. 3 is the B-B profile of reactor shown in Figure 1.
The specific embodiment:
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of reactor, comprise reacting cylinder body 13, cross section is square, and two ends are provided with air inlet 1 and gas outlet 4 respectively, reacting cylinder body 13 is made by insulating materials, as being coated with stainless steel of insulating coating etc., the utility model reacting cylinder body 13 is divided into two sections, wherein, part near air inlet 1 is a reaction of low temperature plasma section 2, and the part of close gas outlet 4 is a light-catalyzed reaction section 3.
The two opposite inner walls face is respectively equipped with upper strata metallic conduction plate 11 and lower metal conductive plate 12 about in the reaction of low temperature plasma section 2, upper strata metallic conduction plate 11 and lower metal conductive plate 12 are close to the inwall of reacting cylinder body 13, and the spacing between them is 50mm, according to practical situations, can be adjusted into 50～100mm.Upper strata metallic conduction plate 11 surface attachment have metal tip object 7, and the height of metal tip object 7 is 10mm, and adjacent two metal tip objects, 7 distances are 10mm, and similarly its specification also can be adjusted.
Photocatalysis thin plate 9 and ultraviolet light group 10 are set in the light-catalyzed reaction section 3, photocatalysis thin plate 9 and ultraviolet light group 10 all are axial arranged along reacting cylinder body 13, photocatalysis thin plate 9 is provided with 10 layers, every interlamellar spacing 30mm, the catalyst of photocatalysis thin plate 9 is TiO2, carrier is a ceramic honey comb, and each ultraviolet light group 10 includes the some ultraviolet lamp tubes that are parallel to each other, and its quantity is determined according to practical situations.
The catalyst sheet of present embodiment prepares by the following method:
(1) diatomite with defeat into the pie of tablet press machine with 10MPa, smash screening again to needed size, put into dry beaker, add a certain amount of absolute ethyl alcohol again, place on the magnetic stirring apparatus and stir, measure a certain amount of butyl titanate then and put into special-purpose small beaker, and dropwise join in the absolute ethyl alcohol with dropper, after mixed solution stirs 1h, dropwise add concentrated hydrochloric acid as inhibitor, in mixed solution, slowly add a small amount of distilled water again after stirring 30min, stop to stir after dropwising 5min, leave standstill, promptly form faint yellow TiO
2Colloidal sol.V wherein
Butyl titanate: V
Absolute ethyl alcohol: V
Distilled water: V
Concentrated hydrochloric acid=1: 4: 0.25: 0.25.
(2) the ceramic honey comb finished product is put into colloidal sol, at the uniform velocity promote behind the 5min,, repeat this step and can obtain the required number of plies, be advisable for 3～5 layers then at air drying 5min.
(3) with the half-finished product plate that makes at 75 ℃ of following vacuum drying 24h, put into 4 hours (be warming up to 500 degrees centigrade in 1st hour, kept 2 hours, be cooled to 60 degrees centigrade in last 1 hour) of 500 degrees centigrade of calcinings of Muffle furnace again.
Air inlet 1 place of reacting cylinder body 13 is provided with the board-like vortex generating means of eddy flow 6, make the air generation flow-disturbing that enters in the reacting cylinder body 13, the airflow uniform distribution device 8 that reacting cylinder body 13 inside between reaction of low temperature plasma section 2 and the light-catalyzed reaction section 3 have the loose structure corrosion resistant plate to make makes the air-distribution that enters light-catalyzed reaction section 3 more even.Whether finish dealing with in order to detect soil in addition, organic quality testing is set behind the airflow uniform distribution device between two sections 8 surveys mouth.
During use, upper strata metallic conduction plate 11 ground connection, as discharge anode, lower metal conductive plate 12 connects the high voltage source negative pole, and as the discharge negative electrode, its operation principle is as follows:
(1) with pending soil breaking, soil particle 5 is not more than 3mm, is tiled in then on the lower metal conductive plate 12;
(2) connect power supply (voltage 30～60kV), from air inlet 1 bubbling air, air velocity is 5～10cm/s, relative air humidity maintains 30～40%, air evenly enters in the reaction of low temperature plasma section 2 through vortex generating means 6, carry out corona discharge between upper strata metallic conduction plate 11 and the lower metal conductive plate 12, with air ionization, produce low temperature plasma, organic pollution generation electron collision and radical reaction in low temperature plasma and the soil, the part organic pollution is broken down into innocuous substance, remains not that the organic pollution of complete reaction will evaporate with gaseous material, and evenly enters light-catalyzed reaction section 3 by airflow uniform distribution device 8;
(3) TiO in light-catalyzed reaction section 3
2When photocatalysis thin plate 9 is subjected to energy greater than ultraviolet tube group 10 irradiation of energy gap, electronics on its valence band is excited, cross the forbidden band and enter conduction band, stay the hole of positively charged in valence band, light induced electron and photohole are under the space electric field effect, take place effectively to separate, they be adsorbed on TiO
2Photocatalysis thin plate 9 lip-deep material generation redox reactions can make OH
-And H
2The O effect produces strong oxidizer HO, and it is CO that strong oxidizer HO continues oxidation Decomposition with remaining organic pollution
2And H
2Innocuous substances such as O can effectively be removed the organic pollution in the soil, reduce secondary pollution;
(4) the detection mouth between two sections detect meet air quality standard contain the organic matter air from reaction of low temperature plasma section 2 output, expression soil is finished dealing with, deenergization takes out soil.
Application examples 1
Adopt the reactor in the present embodiment 1, in the laboratory, handle the simulating pollution soil that contains benzene, toluene respectively.
The concrete parameter of the processing method that adopts in the test is as follows: discharge voltage 35kV, air velocity 5cm/s, relative air humidity 30%; Reaction is at room temperature carried out, and the reaction time is 15～20min.
The treatment effect of pollutant is good, and result of the test is as follows:
Claims (7)
1. the reactor of a low-temperature plasma synergistic photocatalysis treatment contaminated soil, comprise that two ends are provided with the reacting cylinder body (13) of air inlet (1) and gas outlet (4) respectively, it is characterized in that: described reacting cylinder body (13) is divided into two sections vertically, wherein a section near air inlet (1) is reaction of low temperature plasma section (2), and one section of close gas outlet (4) is light-catalyzed reaction section (3).
2. reactor according to claim 1 is characterized in that: the cross section of described reacting cylinder body (13) is square.
3. reactor according to claim 1 is characterized in that: described air inlet (1) locates to be provided with vortex generating means (6); Described reaction of low temperature plasma section (2) is provided with airflow uniform distribution device (8) with light-catalyzed reaction section (3) intersection.
4. reactor according to claim 1, it is characterized in that: upper strata metallic conduction plate (11) that in the described reaction of low temperature plasma section (2) being oppositely arranged is arranged and be close to the reacting cylinder body inwall and lower metal conductive plate (12), upper strata metallic conduction plate (11) surface attachment metal tip object (7), ground connection is as discharge anode, and lower metal conductive plate (12) connects negative high voltage as the discharge negative electrode.
5. reactor according to claim 1 is characterized in that: photocatalysis thin plate (9) and ultraviolet tube group (10) are set in the described light-catalyzed reaction section (3), and photocatalysis thin plate (9) is arranged along the cylindrical shell axially spaced-apart with ultraviolet tube group (10).
6. reactor according to claim 4 is characterized in that: the spacing of double layer of metal conductive plate is 50～100mm up and down, and the length of metal tip thing (7) is 5～10mm, and the spacing of metal tip thing (7) is 10～15mm.
7. reactor according to claim 5 is characterized in that: described photocatalysis thin plate (9) is by tabular carrier and load on supported catalyst and form, and described catalyst is TiO2, and described carrier is a ceramic honey comb.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207251948U CN203091406U (en) | 2012-12-25 | 2012-12-25 | Reactor for treating contaminated soil with low-temperature plasma and photocatalysis |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012207251948U CN203091406U (en) | 2012-12-25 | 2012-12-25 | Reactor for treating contaminated soil with low-temperature plasma and photocatalysis |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103056155A (en) * | 2012-12-25 | 2013-04-24 | 浙江工商大学 | Reactor for treating contaminated soil with low-temperature plasma and photocatalysis and treatment method thereof |
| CN103978027A (en) * | 2014-05-06 | 2014-08-13 | 南京大学 | Spiral recursive discharge plasma soil purifying apparatus |
| CN104607457A (en) * | 2014-12-23 | 2015-05-13 | 中山大学 | Device for treating organic contaminated soil on plasma fluidized bed |
| CN105457999A (en) * | 2016-01-14 | 2016-04-06 | 杨俊锋 | Photocatalytic soil remediation method |
| CN105537262A (en) * | 2016-01-14 | 2016-05-04 | 杨俊锋 | Photocatalysis soil remediation device |
| CN113732035A (en) * | 2021-09-22 | 2021-12-03 | 中国科学院西北生态环境资源研究院 | Soil remediation device combining photocatalysis and electrolysis |
| CN115365288A (en) * | 2022-09-02 | 2022-11-22 | 中南大学 | Electric repair device and repair method for heavy metal contaminated soil by combining low-temperature driving |
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- 2012-12-25 CN CN2012207251948U patent/CN203091406U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103056155B (en) * | 2012-12-25 | 2014-06-25 | 浙江工商大学 | Reactor for treating contaminated soil with low-temperature plasma and photocatalysis and treatment method thereof |
| CN103056155A (en) * | 2012-12-25 | 2013-04-24 | 浙江工商大学 | Reactor for treating contaminated soil with low-temperature plasma and photocatalysis and treatment method thereof |
| CN103978027B (en) * | 2014-05-06 | 2016-08-24 | 南京大学 | A kind of helical delivery pushing-type discharge plasma soil sanitation processing means |
| CN103978027A (en) * | 2014-05-06 | 2014-08-13 | 南京大学 | Spiral recursive discharge plasma soil purifying apparatus |
| CN104607457A (en) * | 2014-12-23 | 2015-05-13 | 中山大学 | Device for treating organic contaminated soil on plasma fluidized bed |
| CN105537262A (en) * | 2016-01-14 | 2016-05-04 | 杨俊锋 | Photocatalysis soil remediation device |
| CN105457999A (en) * | 2016-01-14 | 2016-04-06 | 杨俊锋 | Photocatalytic soil remediation method |
| CN107639113A (en) * | 2016-01-14 | 2018-01-30 | 项敬来 | A kind of soil remediation method |
| CN105457999B (en) * | 2016-01-14 | 2018-02-06 | 项敬来 | A kind of photocatalysis soil remediation method |
| CN105537262B (en) * | 2016-01-14 | 2018-03-02 | 邱博 | A kind of photocatalysis soil restoring device |
| CN107639113B (en) * | 2016-01-14 | 2018-05-29 | 七台河广民环保科技有限公司 | A kind of soil remediation method |
| CN113732035A (en) * | 2021-09-22 | 2021-12-03 | 中国科学院西北生态环境资源研究院 | Soil remediation device combining photocatalysis and electrolysis |
| CN115365288A (en) * | 2022-09-02 | 2022-11-22 | 中南大学 | Electric repair device and repair method for heavy metal contaminated soil by combining low-temperature driving |
| CN115365288B (en) * | 2022-09-02 | 2024-02-27 | 中南大学 | Low-temperature-driven combined heavy metal polluted soil electric restoration device and restoration method |
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Granted publication date: 20130731 Termination date: 20141225 |
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