CN103406346B - Method and treatment system for restoring organic pollution soil through combination of room temperature desorption and chemical oxidation - Google Patents
Method and treatment system for restoring organic pollution soil through combination of room temperature desorption and chemical oxidation Download PDFInfo
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- CN103406346B CN103406346B CN201310300985.5A CN201310300985A CN103406346B CN 103406346 B CN103406346 B CN 103406346B CN 201310300985 A CN201310300985 A CN 201310300985A CN 103406346 B CN103406346 B CN 103406346B
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- 239000002689 soil Substances 0.000 title abstract description 177
- 238000000034 method Methods 0.000 title abstract description 62
- 238000003795 desorption Methods 0.000 title abstract description 41
- 230000003647 oxidation Effects 0.000 title abstract description 40
- 238000007254 oxidation reaction Methods 0.000 title abstract description 40
- 239000000126 substance Substances 0.000 title abstract description 28
- 239000012286 potassium permanganate Substances 0.000 abstract description 24
- 230000008569 process Effects 0.000 abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 16
- 239000005416 organic matter Substances 0.000 abstract description 13
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- 239000002957 persistent organic pollutant Substances 0.000 abstract description 5
- 238000005507 spraying Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 22
- 238000012545 processing Methods 0.000 description 19
- 230000008439 repair process Effects 0.000 description 16
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- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical class CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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Abstract
The present invention discloses a method and a treatment system for restoring organic pollution soil through combination of room temperature desorption and chemical oxidation. The method comprises: placing organic matter polluted soil in a room temperature desorption workshop; adopting a moveable soil turner to turn the polluted soil, wherein one turning is performed every 2 h, a portable photoionization detector is adopted to rapidly detect the concentration of volatile or semi-volatile organic matters at a position above 15-25 cm of the polluted soil during a turning process, and turning is stopped until the detection data is stabilized; and adding a 6% potassium permanganate solution to a liquid tank, opening a water pump and a manual control valve, spraying the potassium permanganate solution to the polluted soil, concurrently adopting the soil turner to uniformly turn the potassium permanganate solution and the polluted soil, and stopping spraying and turning until the potassium permanganate content in the soil achieves the preset addition amount. The present invention further provides a treatment system for the method. With the method, organic pollutant soil restoring efficiency is high, the cost is low, and the method is a combination restoring method with strong practicability in the project.
Description
Technical field
The present invention relates to a kind of normal temperature desorb of organic polluted soil and chemical oxidation combined remediation method and treatment system, belong to environment remediation technical field, be particularly suitable for the reparation of the solid dielectrics such as the volatilization/half volatile organic co-contaminated soil produced in the industries such as chemical industry, oil, coking, printing and dyeing.
Background technology
Soil organic pollutant refers to and enters soil environment and the organic compound polluted, the organic pollution discharge industry related to mainly contains petrochemical industry, coking, paint and coating manufacture, pesticide producing, rubber manufactures, leather shoes manufacture, wood-based plate and wood furniture manufacture, automobile and accessory spraying, Electronic products manufacturing, steel-making, manufacture of cement etc., and soil organic pollutant mostly is the combined pollutant of volatility and/or semi-volatile organic matter, the continuous migration and conversion of these pollutants, pass through respiratory tract, alimentary canals etc. enter human body, great threat is formed to human body.The method of renovation of organic pollution soil is a lot, at present, China's repair process organic co-contaminated soil commonly uses peripheral doses method and dystopy chemical repair method, wherein normal temperature desorb restorative procedure is the physical treatment method for volatility and/or half volatile organic polluted soil, refer to, in the room temperature desorption workshop that seal is good, repeatedly throwing is turned over to soil, volatility in contaminated soil and/or semi-volatile organic matter are evaporated, reduce organic concentration in soil or reach the object of repairing polluted soil, the gas evaporated is collected by room temperature desorption workshop, carry out the emerging soil remediation method of one of vent gas treatment again.Normal temperature desorption method technique is simple, strong operability, processing cost is low, light-concentration volatile and/or half volatile organic polluted soil in effectively processing, but to high concentration volatility and/or the half volatile organic polluted soil processing time long, there is conditions of streaking, effect is relatively poor, greatly limit its application on Practical Project.Dystopy chemical oxidation method refers to and add oxidant in the contaminated soil dug out clearly, by the strong oxidation of oxidant, decomposes the organic pollution in soil.Although dystopy chemical oxidation can decompose organic pollution in soil by the efficient oxidation, but every batch of oxidation repairing polluted soil amount is little and need the oxidant content that adds more, because soil moisture content is higher after oxidation Decomposition organic pollution, cause repairing the transport of rear soil, storing difficulty.
All there is certain defect for the reparation of high concentration volatility and/or half volatile organic co-contaminated soil in normal temperature desorb and chemical oxidation techniques, cannot meet the reparation requirement of organic co-contaminated soil.For making up the deficiency of normal temperature desorb and chemical oxidation recovery technique, the present invention adopts normal temperature desorb to combine chemical oxidation techniques renovation of organic pollution soil, realizes their mutual supplement with each other's advantages.
Summary of the invention
Technical problem to be solved by this invention is for normal temperature desorb, (repair time is long for the deficiency that the single soil remediation method of dystopy chemical oxidation exists when processing high concentration volatility and/or semi-volatile organic matter contaminated soil and defect problem, smearing, cost is high, single batch processed amount is few), a kind of restorative procedure adopting normal temperature desorb to combine chemical oxidation treated high concentration volatility and/or semi-volatile organic matter contaminated soil is provided, first turned over by normal temperature desorb and throw soil removal some volatile and/or semi-volatile organic matter, the concentration of 15-25cm place organic pollution above contaminated soil is detected fast with portable photo-ionization detector (PID), liquor potassic permanganate is added when data to be tested tend to be steady, oxidation Decomposition is carried out to organic pollution in contaminated soil, effectively can avoid the appearance of normal temperature desorb " conditions of streaking ", remarkable shortening repair time.Sprinkling liquor potassic permanganate carries out normal temperature desorb to contaminated soil while carrying out oxidation repairing polluted soil and turns over throwing, remove volatility and/or semi-volatile organic matter on the one hand, reduce content of organics in soil, the use amount of potassium permanganate can be reduced simultaneously, reduce moisture content and rehabilitation cost that rear soil is repaired in oxidation; On the other hand, soil is after turning over throwing, and particle diameter reduces, and effectively facilitates the contact of potassium permanganate and soil, improves organic oxidation Decomposition efficiency.
The combined remediation method of a kind of organic material contaminated soil of the present invention, is characterized in that comprising the following steps:
(1) organic material contaminated soil is placed in room temperature desorption workshop, smooth stacking slivering buttress;
(2) moveable-type soil turner is used to turn over throwing to contaminated soil, turning over and throwing frequency is 2 hours/time, turn in throwing process and use portable photo-ionization detector to detect the volatility at 15-25cm place above contaminated soil or the concentration of semi-volatile organic matter (VOC/SVOC) fast, tend to be steady until detect data, stop turning over throwing;
(3) potassium permanganate is poured into liquid fill with in, being made into concentration is 6%(w/w) the aqueous solution;
(4) open water pump and manual control valve, the flow regulating liquor potassic permanganate is 1-8m
3/ h, makes the addition of potassium permanganate be 0.316-20g/(kg soil);
(5) start moveable-type soil turner simultaneously, repeatedly repeat to spray liquor potassic permanganate, while turn over throwing to contaminated soil, liquor potassic permanganate is mixed with contaminated soil until potassium permanganate content reaches default addition in soil;
(6) turn over the gas evaporated in throwing process, collected by the gas-collecting pipe at room temperature desorption workshop top;
(7) tail gas collected carries out adsorption treatment by exhaust gas processing device.
Meanwhile, present invention also offers a kind of normal temperature desorb for above method associating chemical oxidation repair system, the repair process to high-enriched organics contaminated soil can be realized by this system.
Realize a system for above-mentioned restorative procedure, it is characterized in that: this system comprises room temperature desorption workshop, moveable-type soil turns over polishing apparatus, volatilization gas collection tubes apparatus, portable photo-ionization detector, blast pipe and exhaust gas processing device; Wherein
Described room temperature desorption workshop is the closed structure with sealing logistics door, it is built-in with moveable-type soil and turns over polishing apparatus and portable photo-ionization detector, soil turns over polishing apparatus and throws process for turning over the soil of the Organic Pollution be transported in it, promote the volatilization of organic contaminants in soil, portable photo-ionization detector is for detecting the volatility at 15-25cm place or the concentration of semi-volatile organic matter above contaminated soil;
Described moveable-type soil turns over polishing apparatus and comprises soil turner, liquid filling, water pump, flexible pipe, flowmeter, manual control valve and jet pipe;
Described liquid is filled with and is positioned at soil turner outside, for storing liquor potassic permanganate;
Described water pump is connected by flexible pipe with described flow container, for extracting liquor potassic permanganate;
Described jet pipe is connected by flexible pipe with described water pump, is placed in the stirrer gear top of soil turner, and in the punching of jet pipe bottom, for spraying liquor potassic permanganate;
Described manual control valve is arranged on the flexible pipe before flowmeter, for regulating the flow of liquor potassic permanganate;
Described flowmeter is arranged between jet pipe and water pump, is used to indicate the flow that liquor potassic permanganate enters jet pipe;
Described volatilization gas collection tubes apparatus comprises gas-collecting pipe and air-introduced machine, is positioned at the top of room temperature desorption workshop, and is connected with exhaust gas processing device by blast pipe;
Described gas-collecting pipe links with room temperature desorption workshop top is airtight.
In the present invention, preferably, the bottom of described room temperature desorption workshop is the water-tight concrete layer of setting thickness.
In the present invention, preferably, the film material of described room temperature desorption workshop is polyvinylidene fluoride film.
In the present invention, preferably, described volatilization gas collection tubes apparatus comprises three row's gas-collecting pipes, spacing is separated by 3m, room temperature desorption workshop top and gas-collecting pipe are all opened the hole of diameter 200mm, room temperature desorption workshop is welded at hole place with gas-collecting pipe, pitch of holes 2m on every root gas-collecting pipe.
In the present invention, preferably, gas-collecting pipe adopts lightweight, corrosion-resistant and easily weld with film material, and the tubing that air-tightness is good, is more preferably Kynoar.
In the present invention, preferably, the dischargeable capacity of described flow container is 2m
3.
In the present invention, preferably, described water pump uses dc source, and opening flow is 10m
3/ h.
In the present invention, preferably, described jet pipe is DN25 steel pipe, long 3000mm, and jet pipe bottom is equipped with 3 rounds, and row and row are separated by 10mm, make a call to a hole in same row every 100mm, and the hole between adjacent two rows misplaces mutually, and aperture is 3mm.
During work, smoothly in room temperature desorption workshop stack organic polluted soil, first organic material contaminated soil is carried out to the normal temperature desorb process of certain hour, namely moveable-type soil turner is used to turn over throwing to soil, turning over and throwing frequency is 2 hours/time, turn in throwing process the VOC/SVOC concentration using PID to detect 15-25cm place above contaminated soil fast, tend to be steady until detect data, stop turning over throwing; Be placed in liquid on moveable-type soil turner fill with fill 6%(w/w) liquor potassic permanganate; Open water pump and manual control valve, adjust flux is 1-8m
3/ h, controlling potassium permanganate addition is 0.316-20g/(kg soil); Start moveable-type soil turner simultaneously, repeatedly repeat on one side to spray liquor potassic permanganate, while carry out normal temperature desorb to contaminated soil to turn over throwing, liquor potassic permanganate is mixed until potassium permanganate content reaches default addition (0.316-20g/(kg soil) in soil with contaminated soil); Normal temperature desorb turn over throw and chemical oxidation of gold in volatilization and generation gas collected by room temperature desorption workshop after, by being positioned at the gas-collecting pipe at room temperature desorption workshop top under the effect of air-introduced machine, entering exhaust gas processing device by gas-collecting pipe and processing.Soil particle diameter after repair process is less than 2cm.
The present invention compared with prior art its advantage is:
(1) normal temperature desorb associating chemical oxidation repair process high concentration volatilization/half volatile organic polluted soil, effectively can avoid the appearance of " conditions of streaking ", significantly shorten repair time, reduce quantities;
(2) throw soil in room temperature desorption workshop varus, organic matter is evaporated, remove part volatilization/half volatile organic contaminant, be conducive to the use amount reducing Soil oxidation agent, reduce processing cost;
(3) carry out normal temperature desorb to soil and turn over throwing, soil particle diameter reduces, and oxidant is sprayed at the stirrer gear front of soil turner, can the contact of accelerating oxidation agent and contaminated soil effectively, and improve the utilization rate of oxidant, process afterwards soil particle diameter is less than 2cm;
(4) adopt a small amount of principle repeatedly when spraying liquor potassic permanganate, spray solution turns over throwing while carry out normal temperature desorb, and what be conducive to that potassium permanganate disperses in soil homogenizes, the utilization rate of raising potassium permanganate;
(5) for volatilization/half volatile organic contaminant in high density pollution soil, there is good elimination effect, accessible pollutant kind is many, as polycyclic aromatic hydrocarbon, petroleum-type, benzene homologues, organic agricultural chemicals etc., be particularly suitable for repairing volatilization half volatile organic double compound contaminated soil;
(6) system features in convenient of the present invention, single batch of project treatment amount is large, and be different from domestic existing soil remediation equipment and be only applicable to laboratory or pilot scale utilization, the present invention is more suitable for the larger Practical Project of contaminated soil earth volume;
(7) whole processing procedure is all in room temperature desorption workshop, and all organic pollutants are all collected by room temperature desorption workshop and carried out subsequent treatment, can not cause the secondary pollution of gaseous organic pollutant.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below.Apparently, the accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, can also obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the structural principle block diagram of soil remediation method of the present invention;
Fig. 2 is the treatment system schematic diagram (front view) for normal temperature desorb associating chemical oxidation renovation of organic pollution soil of one embodiment of the invention;
Fig. 3 is the flow chart of steps of soil remediation method embodiment of the present invention;
The concentration curve of naphthalene in soil when Fig. 4 is different restorative procedure process high-concentration naphthalene contaminated soil.
Description of reference numerals
1 contaminated soil
2 moveable-type soil turners
3 liquid are filled with
4 water pumps
5 manual control valves
6 flowmeters
7 flexible pipes
8 jet pipes
9 stirrer gears
10 room temperature desorption workshop devices
11 volatilization gas collection tubes apparatus
12 blast pipes
13 exhaust gas processing devices
14 portable photo-ionization detectors
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not paying the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
To be placed in existing equipment room temperature desorption workshop (Beijing Dingshi Environmental Engineering Co., Ltd.'s production) by organic material contaminated soil, smooth stacking slivering buttress, soil turner is used to turn over throwing to contaminated soil, turning over and throwing frequency is 2 hours/time, turn in throwing process the VOC/SVOC concentration using portable photo-ionization detector (PID) to detect 15-25cm place above contaminated soil fast, tend to be steady until detect data, stop turning over throwing.Poured into by potassium permanganate during liquid fills with, being made into concentration is 6%(w/w) solution, open water pump and manual control valve, regulate the flow of liquor potassic permanganate to be 1-8m
3/ h, the addition controlling potassium permanganate is 0.316-20g/(kg soil), start moveable-type soil turner simultaneously, repeatedly repeat on one side to spray liquor potassic permanganate, throw process while turn over soil, liquor potassic permanganate and contaminated soil are fully mixed until potassium permanganate content reaches preset concentration in soil.After adding liquor potassic permanganate, turning in throwing process, except the effect of oxidant, the part volatilization/semi-volatile organic matter in contaminated soil also evaporates, collected by the discharge at room temperature desorption workshop top, substantially increase organic removal efficiency in soil.The structural principle block diagram of soil remediation method of the present invention as shown in Figure 1.
Organic material contaminated soil restorative procedure of the present invention and treatment system, the showering for high-enriched organics contaminated soil has good application prospect.By turning over, throw can not only fully the contacting of accelerating oxidation agent and soil, the volatilization of organic pollution in contaminated soil can also be improved, thus reduce the use amount of oxidant, also effectively reduce a large amount of soil physical and chemical performance change using oxidant to cause simultaneously, reduce processing cost.Devise gathering-device and the exhaust gas processing device of volatilization gas in treatment system of the present invention, prevent volatilization gas to be diffused in air, cause secondary pollution.
Method of the present invention comprises:
In room temperature desorption workshop, throwing is turned over to contaminated soil, in contaminated soil, sprays 6%(w/w by jet pipe simultaneously) liquor potassic permanganate, potassium permanganate addition is 0.316-20g/(kg soil).
Normal temperature desorption step:
Find in experiment, use existing normal temperature stripping apparatus (Beijing Dingshi Environmental Engineering Co., Ltd.'s production), in room temperature desorption workshop, contaminated soil is turned over by soil turner and throw process, volatility/the semi-volatile organic matter in soil can be made to evaporate, and the organic removal rate of the high concentration such as dichloroethanes, vinyl chloride contaminated soil reaches 90%.
Method: use moveable-type soil turner to turn over throwing to contaminated soil in room temperature desorption workshop, turning over and throwing frequency is 2 hours/time, turn in throwing process the VOC/SVOC concentration using PID to detect 15-25cm place above soil fast, tend to be steady until detect data, stop turning over throwing.
Oxidant adds operation:
Found through experiments, do not adding and adding in potassium permanganate two kinds of situations, organic clearance significant difference in contaminated soil, therefore think that the interpolation of potassium permanganate can promote the organic oxidation Decomposition in contaminated soil effectively, substantially increase organic removal efficiency in contaminated soil.
Oxidant adding method:
Take a certain amount of potassium permanganate to be placed in liquid and to fill with, being made into concentration is 6%(w/w) the aqueous solution, spill to soil by jet pipe, use moveable-type soil turner fully to be mixed with soil by liquor potassic permanganate simultaneously and contact.
Below, composition graphs 2 and Fig. 3, be described in detail a preferred embodiment of the present invention.
Embodiment 1
Fig. 2 is the schematic diagram (front view) of the present invention for a preferred embodiment of the treatment system of repairing organic polluted soil; As shown in Figure 2, this treatment system comprises: room temperature desorption workshop 10, and moveable-type soil turns over polishing apparatus, volatilization gas collection tubes apparatus 11, blast pipe 12, exhaust gas processing device 13 and portable photo-ionization detector 14; Wherein
Described room temperature desorption workshop 10 is for having the closed structure of sealing logistics door, it is built-in with moveable-type soil and turns over polishing apparatus and portable photo-ionization detector, soil turns over polishing apparatus and throws process for turning over the soil 1 of the Organic Pollution be transported in it, promote the volatilization of organic contaminants in soil, portable photo-ionization detector 14 is for detecting the volatility at 15-25cm place or the concentration of semi-volatile organic matter above contaminated soil;
Described moveable-type soil turns over polishing apparatus and comprises moveable-type soil turner 2, liquid filling 3, water pump 4, manual control valve 5, flowmeter 6, flexible pipe 7 and jet pipe 8;
Described liquid fills with the outside that 3 are positioned at moveable-type soil turner 2, for storing liquor potassic permanganate;
Described water pump 4 is connected, for twitching liquor potassic permanganate by flexible pipe 7 with described flow container 3;
Described jet pipe 8 is connected by flexible pipe 7 with described water pump 4, is placed in stirrer gear 9 top of soil turner, and punches in jet pipe 8 bottom;
Described manual control valve 5 is arranged on the flexible pipe before flowmeter 6, for regulating the flow of liquor potassic permanganate;
Described flowmeter 6 is arranged between jet pipe 8 and water pump 4, is used to indicate the flow that liquor potassic permanganate enters jet pipe 8;
Described volatilization gas collection tubes apparatus 11 comprises gas-collecting pipe and air-introduced machine (not shown), is positioned at the top of room temperature desorption workshop 10, and is connected with exhaust gas processing device 13 by blast pipe 12;
Described room temperature desorption workshop 10 top and gas-collecting pipe all have hole, and room temperature desorption workshop 10 is welded at hole place with volatilization gas collection tubes apparatus 11.
Wherein, the bottom of described room temperature desorption workshop is the water-tight concrete layer of setting thickness, and the film material of described room temperature desorption workshop is Kynoar.
Wherein, described volatilization gas collection tubes apparatus 11 comprises three row's gas-collecting pipes, gas-collecting pipe adopts Kynoar to be prepared from, spacing is separated by 3m, room temperature desorption workshop top and gas-collecting pipe are all opened the hole of diameter 200mm, room temperature desorption workshop is welded at hole place with gas-collecting pipe, pitch of holes 2m on every root gas-collecting pipe.
Wherein, the dischargeable capacity of described flow container 3 is 2m
3.
Wherein, described water pump 4 uses dc source, and opening flow is 10m
3/ h.
Wherein, described jet pipe 8 is DN25 steel pipe, long 3000mm, and jet pipe bottom is equipped with 3 rounds, and row and row are separated by 10mm, make a call to a hole in same row every 100mm, and the hole between adjacent two rows misplaces mutually, and aperture is 3mm.
Enclosed conveying machine is used to be transported in room temperature desorption workshop 10 by the high concentration organic polluted soil 1 mainly polluted by naphthalene, smooth stacking slivering buttress, each the wide 3m in buttress bottom, the wide 2m in top, stacking is highly 1.5m, spacing 1m between buttress, length 80m, each bar of piling up altogether piles up neatly 10, and repairing organic polluted soil is about 3000m altogether
3.
Moveable-type soil turner 2 is used first to turn over throwing to soil, turning over and throwing frequency is 2 hours/time, turn in throwing process the VOC/SVOC concentration using portable photo-ionization detector 14 to detect 15-25cm place above soil fast, until detection data tend to be steady, (about 8h) stops turning over throwing afterwards, and the soil particle after turning over and throwing process is dispersed to about 2cm.
To 6%(w/w be filled) liquid of liquor potassic permanganate fills with 3 and is placed on moveable-type soil turner 2, and open water pump 4 and manual control valve 5, manually by-pass valve control 5 regulates liquor potassic permanganate flow to be 5m
3/ h, is sprayed in the contaminated soil in stirrer gear 9 front by liquor potassic permanganate, the addition of potassium permanganate is 9g/(kg soil), start soil turner, throwing is turned over to soil, liquor potassic permanganate is fully mixed with soil, carry out oxidation Decomposition.Switch off the pump 4 and manual control valve 5.
The organic gas evaporated in whole processing procedure is all collected by the volatilization gas collection tubes apparatus 11 arranged in room temperature desorption workshop 10, is then delivered to exhaust gas processing device 13 by blast pipe 12 and processes.
Use the present embodiment to repair naphthalene contaminated soil, before process, in soil, the content of naphthalene is up to 2504.3mg/kg, and after treatment, within every 2 hours, carry out sample detecting to soil, experimental result is as shown in table 1 below.
Table 1
| Processing time (h) | Concentration (mg/kg) | Clearance (%) |
| 0 | 2504.3 | 0 |
| 2 | 2339.46 | 6.58 |
| 4 | 2293.46 | 8.42 |
| 6 | 1930.73 | 22.90 |
| @ | 1691.06 | 32.47 |
| 10 | 1341.43 | 46.43 |
| 12 | 1143.11 | 54.35 |
| 14 | 816.41 | 67.40 |
| 16 | 521.05 | 79.19 |
| 18 | 204.29 | 91.84 |
| 20 | 138.21 | 94.48 |
Can see from preferred embodiment result, pollution concentration reaches in the naphthalene contaminated soil of 2504.3mg/kg through the inventive method process after 20 hours, naphthalene clearance reaches 94.48%, in soil, the content of naphthalene is 138.21mg/kg, lower than B grade standard value (530mg/kg) in " exhibition land used evaluation criteria of soil environment quality ".
Comparative experimental example 1
In order to further illustrate the technique effect that the inventive method produces, the present invention compares the effect that normal temperature desorb, chemical oxidation and normal temperature of the present invention desorb-chemical oxidation combined remediation method repair high concentration volatility and/or half volatile organic co-contaminated soil, and soil major pollutants are naphthalenes.
The organic co-contaminated soil of identical amount is after room temperature desorption workshop heap slivering buttress, wherein during normal temperature desorb repair process, every 2h turns over throwing once, during chemical oxidation repair process, potassium permanganate is sprayed in contaminated soil as a solution, mix rear every 2h with contaminated soil and sample the concentration surveying naphthalene in soil, during normal temperature desorb-chemical oxidation combined remediation technology repair process, 0-8h carries out normal temperature desorb, spray liquor potassic permanganate after 8h and oxidation Decomposition is carried out to naphthalene in soil, identical when its potassium permanganate dosage and chemical oxidation repair process (9g/kg soil), result is illustrated in fig. 4 shown below.
Fig. 4 shows, normal temperature desorb-chemical oxidation combined remediation technology process contaminated soil, before 8h, the removal of pollutant in soil is substantially identical with normal temperature desorb, not as good as chemical oxidation treatment contaminated soil effect, add potassium permanganate oxidant rear oxidation and decompose pollutant in soil naphthalene, the smearing occurred when eliminating normal temperature desorb process, comparatively chemical oxidation is high for its last treatment effect.As can be seen here, normal temperature desorb associating chemical oxidation recovery technique is better than normal temperature desorb, chemical oxidation monotechnics repair process high concentration organic co-contaminated soil.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a method for normal temperature desorb associating chemical oxidation renovation of organic pollution soil, is characterized in that comprising the following steps:
(1) organic material contaminated soil is placed in room temperature desorption workshop, smooth stacking slivering buttress;
(2) moveable-type soil turner is used to turn over throwing to contaminated soil, turning over and throwing frequency is that every 2h turns over throwing once, turn in throwing process and use portable photo-ionization detector to detect the volatility at 15-25cm place or the concentration of semi-volatile organic matter above contaminated soil fast, tend to be steady until detect data, stop turning over throwing;
(3) potassium permanganate is poured in flow container, be made into the aqueous solution that concentration is 6% (w/w);
(4) open water pump and manual control valve, the flow regulating liquor potassic permanganate is 1-8m
3/ h, makes the addition of potassium permanganate be 0.316-20g/kg soil;
(5) start moveable-type soil turner simultaneously, repeatedly repeat on one side to spray liquor potassic permanganate, throwing is turned over to contaminated soil, liquor potassic permanganate is mixed with contaminated soil, until potassium permanganate content reaches default addition in soil, stop spraying and turning over throwing;
(6) turn over the gas evaporated in throwing process, collected by the gas-collecting pipe at room temperature desorption workshop top;
(7) tail gas collected carries out adsorption treatment by exhaust gas processing device.
2. the treatment system for the method for normal temperature desorb associating chemical oxidation renovation of organic pollution soil according to claim 1, it is characterized in that: this system comprises room temperature desorption workshop, moveable-type soil turns over polishing apparatus, volatilization gas collection tubes apparatus, portable photo-ionization detector, blast pipe and exhaust gas processing device; Wherein
Described room temperature desorption workshop is the closed structure with sealing logistics door, it is built-in with moveable-type soil and turns over polishing apparatus and portable photo-ionization detector, soil turns over polishing apparatus and throws process for turning over the soil of the Organic Pollution be transported in it, promote the volatilization of organic contaminants in soil, portable photo-ionization detector is for detecting the volatility at 15-25cm place or the concentration of semi-volatile organic matter above contaminated soil;
Described moveable-type soil turns over polishing apparatus and comprises soil turner, flow container, water pump, flexible pipe, manual control valve, flowmeter and jet pipe;
It is outside that described flow container is positioned at soil turner, for storing liquor potassic permanganate;
Described water pump is connected by flexible pipe with described flow container, for extracting liquor potassic permanganate;
Described jet pipe is connected by flexible pipe with described water pump, is placed in the stirrer gear top of soil turner, and in the punching of jet pipe bottom, for spraying liquor potassic permanganate to soil; Described jet pipe is DN25 steel pipe, long 3000mm, and jet pipe bottom is equipped with 3 rounds, and row and row are separated by 10mm, make a call to a hole in same row every 100mm, and the hole between adjacent two rows misplaces mutually, and aperture is 3mm;
Described manual control valve is arranged on the flexible pipe before flowmeter, for regulating the flow of liquor potassic permanganate;
Described flowmeter is arranged between jet pipe and water pump, is used to indicate the flow that liquor potassic permanganate enters jet pipe;
Described volatilization gas collection tubes apparatus comprises gas-collecting pipe and air-introduced machine, is positioned at the top of room temperature desorption workshop, and is connected with exhaust gas processing device by blast pipe; Described volatilization gas collection tubes apparatus comprises three row's gas-collecting pipes, spacing is separated by 3m, room temperature desorption workshop top and gas-collecting pipe are all opened the hole of diameter 200mm, room temperature desorption workshop is welded at hole place with gas-collecting pipe, pitch of holes 2m on every root gas-collecting pipe;
Described gas-collecting pipe links with room temperature desorption workshop top is airtight.
3. treatment system as claimed in claim 2, is characterized in that: the bottom of described room temperature desorption workshop is the water-tight concrete layer of setting thickness.
4. treatment system as claimed in claim 2 or claim 3, is characterized in that: the film material of described room temperature desorption workshop is polyvinylidene fluoride film.
5. treatment system as claimed in claim 2, is characterized in that: the material of described gas-collecting pipe is Kynoar, is convenient to gas-collecting pipe and is connected with room temperature desorption workshop tight.
6. treatment system as claimed in claim 2, is characterized in that: the dischargeable capacity of described flow container is 2m3.
7. treatment system as claimed in claim 2, is characterized in that: described water pump uses dc source, and opening flow is 10m
3/ h.
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