CN203281600U - Low-temperature plasma processing device for soil persistent organic pollutants - Google Patents
Low-temperature plasma processing device for soil persistent organic pollutants Download PDFInfo
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- CN203281600U CN203281600U CN2013202306544U CN201320230654U CN203281600U CN 203281600 U CN203281600 U CN 203281600U CN 2013202306544 U CN2013202306544 U CN 2013202306544U CN 201320230654 U CN201320230654 U CN 201320230654U CN 203281600 U CN203281600 U CN 203281600U
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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
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Abstract
A low-temperature plasma processing device for soil persistent organic pollutants comprises a reaction kettle and a reaction stand, wherein the reaction kettle is composed of a reaction kettle container and a reaction kettle cover plate; an air inlet and an air outlet are arranged in the reaction kettle container; the reaction kettle cover plate is arranged on the reaction kettle container; the reaction stand comprises an insulation board, an electric conductive base, a low-temperature plasma power source and a fan; support rods are arranged on the electric conductive base; the insulation board is arranged on the support rods; a high voltage electrode and an upper binding post are arranged on the insulation board; a grounding electrode and a lower binding post are arranged on the electric conductive base, and the high voltage electrode and the grounding electrode are oppositely arranged; the fan is arranged towards the electrodes; the upper binding post is connected with the low-temperature plasma power source; the lower binding post is connected with a ground wire; the reaction kettle is arranged between the high voltage electrode and the grounding electrode. The processing device is simple in operation, high in pollutant removing efficiency, less in equipment investment, low in processing cost and suitable for small-scale test for soil restoration with persistent organic pollution.
Description
Technical field
The utility model belongs to organic polluted soil recovery technique field, is specifically related to a kind of apparatus for low-temperature plasma treatment of soil persistent organic pollutant using.
Background technology
Persistence organic pollutant (Persistent Organic Pollutants is called for short POPs) mainly is divided into three major types: the byproduct (dioxin and furans) in pesticide (drinox, Niran, DDT etc.), industrial chemical (Polychlorinated biphenyls and hexachloro-benzene) and production.In recent years, pesticide and industrial chemical are widely used in China's industrial and agricultural production.Strong toxicity, degraded are difficult, easily enrichment because these materials have, and the most of agricultural land soil of China and industrial land can detect all that it is residual, and human security is brought potential hazard.Therefore, cause that people pay close attention to widely.
POPs refer to by various surrounding mediums (atmosphere, water, organism etc.) can long-distance migration and long-term existence in environment, have extended residual, bioconcentration, half volatile and high toxicity, human health and environment are had the natural of serious harm or artificial synthetic organic pollution materials.POP after entered environment, can cause serious impact and destruction to the ecosystem by all means, and correlative study shows, organism is exposed to POPs also can cause that dysgenesia, deformity, organ increase, the phenomenons such as body death.Harm is mainly contained: a class is the impact on children's birth weight, the obstacle of skeleton development and the disorder of metabolism; Equations of The Second Kind is to nervous system, the disorder of notice, immune inhibition; The 3rd class is the harm to reproductive system.The 4th class is carcinogenic.Therefore, the soil after persistence organic pollutant is polluted must carry out properly and science is disposed, to guarantee its safety.
At present, the recovery technique of persistence organic pollutant commonly used mainly contains: high temperature incineration, cement kiln disposal, thermal desorption, mechanochemistry dehalogenation, vitrification etc., it is high that yet high temperature incineration and cement kiln disposal technology require, and have the potential danger that forms secondary pollution, thermal desorption, mechanochemistry dehalogenation and vitrification processing cost are higher.
In atmos low-temperature plasma technical gas discharge plasma, high vibration excited state or electron excitation metastable state N that electronics and airborne nitrogen, oxygen, hydrone collision generate
2Material, strong oxidizing property material, these species act on pollutant, finally generate carbon dioxide and water, for removing at low temperatures noxious pollutant, have opened up new approach.Dielectric barrier discharge is a kind of mode that produces low temperature plasma, it refers to dielectric is inserted a kind of nonequilibrium state gas discharge of discharge space, when applying sufficiently high alternating voltage between two electrodes, interelectrode gas is understood breakdown and is produced discharge, has namely produced dielectric barrier discharge.
What patent JP2002153834 adopted is after pending soil is heated to uniform temperature, carry out the method for Low Temperature Plasma Treating after forcing pollutant in pending soil to be overflowed in the gas mode, the method is because of the obvious original physicochemical property of spoiled soil of heat treated.What patent JP2004283684 adopted is after volatile organic contaminant extracting in soil, dusty gas to be carried out the method for Low Temperature Plasma Treating.Yet these two kinds of methods relatively are applicable to the volatile organic contaminant contaminated soil and organic pollution pollutes shorter soil of time, for processing persistence organic pollutant, certain limitation are arranged.And these two kinds for the treatment of system equipment investments are larger, and processing cost is higher.
Summary of the invention
The technical problem that solves: the application, for severe persistent organism contaminated soil (especially contaminated soil of site), provides a kind of apparatus for low-temperature plasma treatment with good repairing effect.
Technical scheme: a kind of apparatus for low-temperature plasma treatment of soil persistent organic pollutant using, comprise reactor and reaction bench, described reactor is comprised of reactor container and reactor cover plate, described reactor container is provided with air inlet and gas outlet, and the reactor cover plate is located on the reactor container; Reaction bench comprises insulation board, conductive seat, low-temperature plasma electrical source and fan, conductive seat is provided with support bar, insulation board is located on support bar, insulation board is provided with high-field electrode and upper binding post, and conductive seat is provided with earth electrode and lower binding post, and high-field electrode and earth electrode are oppositely arranged, fan is towards the electrode setting, upper binding post is connected with low-temperature plasma electrical source, and lower binding post is connected with ground wire, and reactor is located between high-field electrode and earth electrode.
Described support bar is provided with the insulation board arrangement for adjusting height, and described arrangement for adjusting height is nut.
Two opposite flanks of described insulation board are provided with adjusting nut, in order to the fixation reaction still.
Described high-field electrode and earth electrode are cylinder, and the cylinder side is provided with one group of groove.
Described reactor is comprised of quartz reaction kettle cover plate and reactor container, and described reactor container consists of quartzy annulus and stainless steel base plate, offers two holes on quartzy annulus, is connected with quartz ampoule on hole.
Described low-temperature plasma electrical source power output is 0～2kW, frequency-tuning range 5～30kHz, and the output voltage adjustable range is 0～30kV.
Described device is processed the method for soil persistent organic pollutant using, and step is: the first step, and the natural air drying contaminated soil after screening is put into reactor, and make it uniform fold in the reactor bottom; Second step, be placed in reactor between electrode, and after switching on power, dielectric barrier discharge generation low temperature plasma and persistence organic pollutant react and make it to be removed.
When processing gesarex polluted soil, low-temperature plasma electrical source power output 1kW, processing time 20min, atmospherical discharges atmosphere, soil particle diameter＜1mm.
When processing polycyclic aromatic hydrocarbon pollution, low-temperature plasma electrical source power output 1kW, processing time 15min, atmospherical discharges atmosphere, soil particle diameter＜1mm.
Beneficial effect: the application provides the apparatus for low-temperature plasma treatment of soil persistent organic pollutant using, utilizes existing O in reactor
2, N
2High energy electron in the low temperature plasma that produces with a small amount of water equimolecular and dielectric barrier discharge bumps, and generates OH, H, O, O
3, HO
2Etc. active free radical, these free radicals and contaminant molecule produce a series of reaction and produce free of contamination CO
2And H
2O。This treating apparatus is simple to operate, removes pollutant efficiency high, and equipment investment is little, and processing cost is low, is applicable to the small-scale test of persistency organic contaminant soil remediation.
Description of drawings
Fig. 1 is the apparatus for low-temperature plasma treatment structural representation of the utility model soil persistent organic pollutant using;
Fig. 2 is reaction of low temperature plasma still structural representation in Fig. 1;
Fig. 3 is the impact of processing time on total DDT concentration;
Fig. 4 be the processing time to o, p'-DDE, p, p'-DDE, o, p'-DDT and p, the impact of p'-DDT concentration;
Fig. 5 is the impact of processing time on total polycyclic aromatic hydrocarbon and benzo [a] pyrene concentration.
The specific embodiment
Following examples further illustrate content of the present utility model, but should not be construed as restriction of the present utility model.In the situation that do not deviate from the utility model spirit and essence, modification and replacement to the utility model method, step or condition are done, all belong to scope of the present utility model.
If do not specialize, the conventional means that in embodiment, technological means used is well known to those skilled in the art.
Embodiment 1:
The Low Temperature Plasma Treating method of soil persistent organic pollutant using of the present utility model is mainly: the first step, natural air drying contaminated soil after screening is put into reactor, and make it uniform fold in reactor container 1 bottom, then reactor cover plate 2 is covered on reactor container 1; Second step, be placed in reactor on earth electrode 3, and the height of regulating high-field electrodes 6 by the nut 5 of rotation stainless steel support bar 4 makes it to fit tightly with reactor, then the nut 8 of tightening insulation board 7 both sides makes it to keep fixing; The 3rd goes on foot, and, if need to build deacration other discharge atmosphere in addition, required atmosphere can be entered reaction system by reactor air inlet 9, then 10 discharges through gas outlet; The 4th step, upper binding post 11 on the insulation board of polytetrafluoroethylene (PTFE) material 7 is joined with low-temperature plasma electrical source 12, lower binding post 14 on stainless steel conductive seat 13 is joined with ground wire, open low-temperature plasma electrical source 12 and power output and be set to 1kW, open cooling fan 15; In the 5th step, keep good discharge condition, makes dielectric barrier discharge produce existing O in low temperature plasma and reaction system
2, N
2Generate OH, H, O, O with a small amount of water equimolecular
3, HO
2Deng Active Radicals Produced, until these free radicals and contaminant molecule complete reaction, then regulating power is closed low-temperature plasma electrical source 12 after lower than 200W.
Embodiment 2:
A kind of apparatus for low-temperature plasma treatment of soil persistent organic pollutant using, comprise reactor and reaction bench, described reactor is comprised of reactor container 1 and reactor cover plate 2, and described reactor container is provided with air inlet 9 and gas outlet 10, and reactor cover plate 2 is located on reactor container 1; Reaction bench comprises insulation board 7, conductive seat 13, low-temperature plasma electrical source 12 and fan 15, conductive seat 13 is provided with support bar 4, insulation board 7 is located on support bar 4, insulation board 7 is provided with high-field electrode 6 and upper binding post 11, conductive seat 13 is provided with earth electrode 3 and lower binding post 14, high-field electrode 6 and earth electrode 3 are oppositely arranged, fan 15 is towards the electrode setting, upper binding post 11 is connected with low-temperature plasma electrical source 12, lower binding post 14 is connected with ground wire, and reactor is located between high-field electrode 6 and earth electrode 3.Described support bar 4 is provided with the insulation board arrangement for adjusting height, and described arrangement for adjusting height is nut 5.Two opposite flanks of described insulation board 7 are provided with adjusting nut 8, in order to the fixation reaction still.Described high-field electrode 6 and earth electrode 3 are cylinder, and the cylinder side is provided with one group of groove.Described reactor is comprised of quartz reaction kettle cover plate and reactor container, and described reactor container consists of quartzy annulus and stainless steel base plate, offers two holes on quartzy annulus, is connected with quartz ampoule on hole.Low-temperature plasma electrical source (CTP-2000K, Nanjing Rong Man Electronics Co., Ltd.) power output is 0～2kW, frequency-tuning range 5～30kHz, and the output voltage adjustable range is 0～30kV.
Embodiment 3:
With embodiment 2, a kind of apparatus for low-temperature plasma treatment of soil persistent organic pollutant using, comprise low-temperature plasma electrical source, two stainless steel discharge electrodes, reactor and external cooling fans.Described reactor is placed between two stainless steel electrodes, and the three fits tightly.Described low-temperature plasma electrical source power output is 0～2kW, frequency-tuning range 5～30kHz, and the output voltage adjustable range is 0～30kV.Described sparking electrode is the stainless steel cylinder of diameter 150mm, thickness 26mm, the electrode sidewall periphery design 5 road grooves, the surface area that this design has increased electrode is beneficial to electrode heat radiation in discharge process.Described sparking electrode consists of high-field electrode and earth electrode, the high-field electrode that wherein is fixed on polytetrafluoroethylene (PTFE) material insulation board connects low-temperature plasma electrical source by positive pole, and the earth electrode that is fixed on the stainless steel base is connected with ground wire by negative terminal.The teflon insulation plate by two threaded stainless steel columns be supported on the stainless steel base directly over.Reactor comprises that a container and a diameter are that 214mm, thickness are the quartzy cover plate of 3mm, and this container is that 214mm, internal diameter are that 150mm, thickness are that the quartzy annulus of sheet of 8mm and diameter are that 168mm, thickness are that the stainless-steel sheet of 3mm is bonded up and down by a slice external diameter.Quartzy annulus both sides at container, have the aperture that a diameter is 6mm separately, and this small pitch is from quartzy upper surface 1mm, and the quartz round tube of an external bending.This design can be used for passing into the required various gases of experimental design in reactor, thereby builds Different hypothermia plasma discharge atmosphere.Described external cooling fan is NMB2110KL-03B-B65, power 3.6W, is used for the stainless steel electrode cooling.
Embodiment 4: adopt embodiment 3 equipment to investigate the impact of processing time on DDT (DDTs) clearance
For trying soil: pick up from the discarded production site of Zhangjiakou DDT, its basic physical and chemical is as shown in table 1.Pollutant in soil mainly comprises 6 kinds of DDT and derivative thereof etc., and soil after natural air drying, is crossed 20 orders (1mm) sieve, and is standby.
Table 1 is for the basic physical and chemical of examination soil
Basic parameter arranges: discharge power 1kW, soil particle diameter＜1mm, atmospherical discharges atmosphere, frequency 50Hz and voltage 220V(standard line voltage); Processing time: establish 0,1,5,10,15,20,25,30,40min totally 9 levels, each level is done 4 repetitions.After the low temperature plasma post processing, soil is crossed 60 mesh sieves, for analyzing DDTs content.
Interpretation of result:
As shown in Figure 3, along with the increase in processing time, ∑ DDT concentration is remarkable downward trend.In 0～15min time period, ∑ DDT descends comparatively slow; Between 15～20min, ∑ DDT is from 207.6mgkg
-1Drop to 9.23mgkg
-1After 20min, downward trend is mild.When the processing time was 20min, the clearance of ∑ DDT can reach 98.1%.
For different component pollutant levels variation tendency as shown in Figure 4.Wherein, p, p'-DDE, o, p'-DDT and p, p'-DDT concentration all significantly descends along with the increase in processing time, and o, p'-DDE concentration is to rise to some extent in the incipient stage, descends gradually after 5min.After 20min, each component downward trend all tends towards stability, and its concentration almost no longer changes.As seen from Figure 7, the processing time, while being 20min, DDTs concentration sharply descended, and slightly descended afterwards, and clearance is 95.3%～99.9%.
As shown in Table 2, when the processing time is 20min, o, p'-DDD and p, the clearance of p'-DDD are 99.3% and 98.1%.
Table 2 processing time is to o, p'-DDD and p, the impact of p'-DDD removal effect
Result shows, when processing time 5min, and o, p'-DDE concentration reaches maximum, is subsequently remarkable decline, and this may be because the free radical, excited atom, excited state molecule isoreactivity material and the finite energy that produce in 0～5min, can not make o, the p'-DDT complete oxidation generates CO
2, HO
2Deng, thereby only there are part C-H key and C-Cl key fracture to generate o, p'-DDE.And p, downward trend after p'-DDE concentration does not obviously first increase, may be also due to the p in soil, and the p'-DDT relative concentration is lower, and the p of generation, p'-DDE are also lower thereby variation tendency is not obvious.Be 20min when the processing time, DDTs clearance 95.3%～99.9%; During 40min, clearance 98%～100%.And when the processing time was increased to 40min, although energy consumption doubles, clearance had only risen 2.7%.Simultaneously, ∑ DDT, o during 20min, p'-DDE, p, p'-DDE, o, p'-DDD, p, p'-DDD, o, p'-DDT and p, p'-DDT concentration is respectively 9.23,5.36,3.39,0.048,0.023,0.29 and 0.13mgkg
-1, all lower than place soil environmental risk assessment screening value and place soil remediation suggestion desired value.Therefore from the angle of construction budget as can be known, 20min is the optimized processing time, can guarantee to reach repairing effect, also avoids too much energy waste simultaneously.When discharge power 1kW, processing time 20min, atmospherical discharges atmosphere, soil particle diameter 0～0.9mm, the clearance of DDTs is 95.3%～99.9%, has reached relevant criterion, can be used as the suitable condition of Low Temperature Plasma Treating DDTs contaminated soil.
Embodiment 5: adopt embodiment 3 equipment to investigate the impact of processing time on polycyclic aromatic hydrocarbon (PAHs) clearance
For trying soil: pick up from jiangsu wuxi PAHs contaminated soil, its basic physical and chemical is: for the examination physiochemical properties of soil be: water content 3.5%, organic 23.4gkg
-1, full nitrogen 1.44gkg
-1, full phosphorus 0.86gkg
-1, full potassium 12.3gkg
-1, cation exchange capacity 15.6cmolkg
-1Pollutant in soil mainly comprises 16 kinds of PAHs of EPA regulation, and soil after natural air drying, passes through 4 orders successively, 10 orders, and 20 purpose sub-sieves, obtain respectively＜1mm, 1～2mm, 2～5mm soil particle.
Basic parameter arranges: discharge power 1kW, soil particle diameter＜1mm, atmospherical discharges atmosphere, frequency 50Hz and voltage 220V(standard line voltage); Processing time: establish a 10min and 15min2 level, each level is done 4 repetitions.After the low temperature plasma post processing, soil is crossed 60 mesh sieves, for analyzing PAHs content.
As shown in Figure 5, along with the increase in processing time, three rings of three kinds of different-grain diameters, Fourth Ring, five rings, six rings, total polycyclic aromatic hydrocarbon and benzo [a] pyrene concentration are remarkable downward trend.When the processing time was 15min, the clearance of total polycyclic aromatic hydrocarbon can reach 98.5%, and the clearance of benzo [a] pyrene is up to 99.9%.
Claims (6)
1. the apparatus for low-temperature plasma treatment of a soil persistent organic pollutant using, it is characterized in that comprising reactor and reaction bench, described reactor is comprised of reactor container (1) and reactor cover plate (2), described reactor container is provided with air inlet (9) and gas outlet (10), and reactor cover plate (2) is located on reactor container (1), reaction bench comprises insulation board (7), conductive seat (13), low-temperature plasma electrical source (12) and fan (15), conductive seat (13) is provided with support bar (4), insulation board (7) is located on support bar (4), insulation board (7) is provided with high-field electrode (6) and upper binding post (11), conductive seat (13) is provided with earth electrode (3) and lower binding post (14), high-field electrode (6) and earth electrode (3) are oppositely arranged, fan (15) is towards the electrode setting, upper binding post (11) is connected with low-temperature plasma electrical source (12), lower binding post (14) is connected with ground wire, reactor is located between high-field electrode (6) and earth electrode (3).
2. a kind of apparatus for low-temperature plasma treatment of soil persistent organic pollutant using according to claim 1, is characterized in that described support bar (4) is provided with the insulation board arrangement for adjusting height, and described arrangement for adjusting height is nut (5).
3. a kind of apparatus for low-temperature plasma treatment of soil persistent organic pollutant using according to claim 1, is characterized in that two opposite flanks of described insulation board (7) are provided with adjusting nut (8), in order to the fixation reaction still.
4. a kind of apparatus for low-temperature plasma treatment of soil persistent organic pollutant using according to claim 1, is characterized in that described high-field electrode (6) and earth electrode (3) are cylinder, and the cylinder side is provided with one group of groove.
5. a kind of apparatus for low-temperature plasma treatment of soil persistent organic pollutant using according to claim 1, it is characterized in that described reactor is comprised of quartz reaction kettle cover plate and reactor container, described reactor container consists of quartzy annulus and stainless steel base plate, offer two holes on quartzy annulus, be connected with quartz ampoule on hole.
6. a kind of apparatus for low-temperature plasma treatment of soil persistent organic pollutant using according to claim 1, it is characterized in that described low-temperature plasma electrical source power output is 0～2 kW, frequency-tuning range 5～30 kHz, the output voltage adjustable range is 0～30 kV.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103272839A (en) * | 2013-04-28 | 2013-09-04 | 中国科学院南京土壤研究所 | Low-temperature plasma processing device and method for persistent organic pollutants in soil |
| CN105312308A (en) * | 2014-07-24 | 2016-02-10 | 台境企业股份有限公司 | Electrokinetic soil treatment device |
| CN106189379A (en) * | 2016-08-15 | 2016-12-07 | 宁波德泰化学有限公司 | A kind of white carbon black removes the method for PAHs |
-
2013
- 2013-04-28 CN CN2013202306544U patent/CN203281600U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103272839A (en) * | 2013-04-28 | 2013-09-04 | 中国科学院南京土壤研究所 | Low-temperature plasma processing device and method for persistent organic pollutants in soil |
| CN103272839B (en) * | 2013-04-28 | 2014-12-24 | 中国科学院南京土壤研究所 | Low-temperature plasma processing device and method for persistent organic pollutants in soil |
| CN105312308A (en) * | 2014-07-24 | 2016-02-10 | 台境企业股份有限公司 | Electrokinetic soil treatment device |
| CN105312308B (en) * | 2014-07-24 | 2018-04-10 | 台境企业股份有限公司 | Electric power land forming device |
| CN106189379A (en) * | 2016-08-15 | 2016-12-07 | 宁波德泰化学有限公司 | A kind of white carbon black removes the method for PAHs |
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Effective date of registration: 20210909 Address after: 253000 floors 1-2, East Annex building, Block E, No. 6596, Dongfanghong East Road, Yuanqiao Town, economic and Technological Development Zone, De Zhou City, Shandong Province Patentee after: Zhongke Hualu soil remediation engineering Co.,Ltd. Address before: 210008 Xuanwu District, Jiangsu, Beijing East Road 71, Nanjing Patentee before: INSTITUTE OF SOIL SCIENCE, CHINESE ACADEMY OF SCIENCES |
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