CN102133578A - Light degradation method and device for eliminating PAHs (Polycyclic Aromatic Hydrocarbons) in polluted soil - Google Patents
Light degradation method and device for eliminating PAHs (Polycyclic Aromatic Hydrocarbons) in polluted soil Download PDFInfo
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- CN102133578A CN102133578A CN2010101015805A CN201010101580A CN102133578A CN 102133578 A CN102133578 A CN 102133578A CN 2010101015805 A CN2010101015805 A CN 2010101015805A CN 201010101580 A CN201010101580 A CN 201010101580A CN 102133578 A CN102133578 A CN 102133578A
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Abstract
The invention relates to soil remediation, in particular relating to a light degradation method and device for eliminating PAHs (Polycyclic Aromatic Hydrocarbons) in polluted soil. The light degradation method comprises the following steps: placing a soil stirring pool loaded with soil to be degraded under an ultraviolet condition; irradiating the soil to be tested, which is intermittently stirred in the soil stirring pool, through ultraviolet light until the PAHs in the soil to be tested are eliminated, wherein the distance from an ultraviolet light source to the soil to be tested is 40-60 cm, and the illumination intensity is 230-240 mu w/cm<2>. The light degradation device comprises a control unit and the soil stirring pool arranged on the control unit, wherein impellers for stirring and turning over the soil are arranged in the soil stirring pool and connected to an impeller shaft, two ends of the impeller shaft are respectively installed on the upper and lower surface of the soil stirring pool through bearings, and the lower end of the impeller shaft is connected with a drive motor in the control unit; and a sampling hole is arranged in the side wall of the soil stirring pool. According to the invention, environment conditions for receiving illumination, such as different turning speeds, different turning times, different intervals and the like can be provided; and the method and device provided by the invention can also be used for researching light degradation on the PAHs in deep soils with different types, different PAHs concentrations and different light sources.
Description
Technical field
The present invention relates to the reparation of contaminated soil, light degradation method and the device of PAHs in a kind of specifically pollution abatement soil.
Background technology
Polycyclic aromatic hydrocarbon compounds (PAHs) is a ubiquitous class organic pollution in the environment.There are two aspects in its source: natural source and artificial source.Natural source mainly is the synthetic of forest and grassland big fire, volcanic eruption, plant and microorganism, and wherein synthetic, the colcanism of higher plant and microorganism are the main factors that produces the PAHs background value; Artificial source is from industrial production and processing (as the refining of production, crude oil and the derivative thereof of coke, carbon black and coal tar and fractionation etc.), and process such as organic imperfect combustion.In artificial source, artificial fuel combustion is the main contribution factor of industrially developed country and urban area PAHs, and the PAHs of exposure has brought huge health hazard for the people that live in developed regions, the world.Why PAHs as environmental contaminants is subjected to people's attention, at first is because secondly carcinogenic, the teratogenesis of some PAHs and mutagenesis are because PAHs stablizes, is difficult to degraded, is ever-increasing trend in environment.Adopt the rational recovery technique of economic benefit and environmental benefit to administer PAHs and pollute, be subject to people's attention more and more.
At present, comprise biological restoration, physics reparation and chemistry reparation about the PAHs pollution remediation technology.The biological restoration of PAHs has a lot of researchs at home and abroad, and biological restoration has many good qualities, and also comes with some shortcomings simultaneously, and is long as the cycle, low to the PAHs treatment effeciency of HMW, and condition is difficult to be controlled etc.; Adopt physical methods such as heating and drip washing to remove, the expense height is handled and is not thoroughly caused secondary pollution easily.The big π key of the delocalization of PAH s can absorb visible (400-700nm) and ultraviolet (290-400nm) part of sunshine, therefore, and a kind of important channel that light degradation transforms as PAH s in the soil and be subjected to extensive attention.Because soil is to the shielding action of light, light degradation can only occur in the topsoil.PAHs in the deep soil can't obtain luminous energy and can not degrade.
Summary of the invention
The object of the present invention is to provide a kind ofly do not have that natural daylight disturbs, light degradation method and the device of PAHs in the pollution abatement soil simple to operate.
To achieve these goals, the technical solution adopted in the present invention is as follows:
The light degradation method of PAHs in a kind of pollution abatement soil: the soil stirring pool that will take up the soil that remains to be degraded places under the ultraviolet condition, by ultraviolet light the soil to be measured that soil stirring pool discontinuous stirs is shone, PAHs in eliminating soil to be measured, wherein ultraviolet source is apart from soil 40-60cm to be measured, and intensity of illumination is 230-240 μ w/cm
2
The described ultraviolet source irradiation soil to be measured that can't pass at room temperature carries out; Described ultraviolet source dominant wavelength is 254nm.Described intermittently stirring is to wait to degrade after soil stirs 20-30min by the soil stirring pool, stops to stir by ultraviolet source irradiation 10-30min, is once and intermittently stirs.
Device: comprise control module and position soil stirring pool thereon, wherein be provided with in the soil stirring pool and be used to stir the impeller that stirs soil, impeller is connected on the impeller shaft, the two ends of impeller shaft by bearing be installed in respectively soil stirring pool top and below, the lower end of impeller shaft links to each other with drive motors in the control module; Soil stirring pool sidewall is provided with sample tap.
Described sample tap is one or more, and when sample tap when being a plurality of, its position is provided with one to the top every 1cm from soil stirring pool sidewall bottom.Described control module comprises drive motors, timer, mixing speed controller and display screen, wherein timer is located in the control loop of drive motors, the mixing speed controller is located in the major loop of drive motors, and the output of timer also links to each other with display screen.Described display screen shows mixing time and blanking time.
The advantage that the present invention had:
1. apparatus of the present invention can be applied to small-sized simulation laboratory test, and it is simple in structure, applicable performance is strong, make research become possibility.
2. environmental condition is multiple and controlled.The present invention can provide difference to stir that speed, difference are stirred the time, different intervals is accepted environmental conditions such as illumination.Also can be used in variety classes, variable concentrations PAHs, Different Light to the photodegradative research of PAHs in the deep soil.
3. can prevent the influence of natural daylight to deep soil PAHs.The containers of soil of the present invention's design adopts the steel design material, can prevent the influence of natural daylight to deep soil PAHs.
4. apparatus of the present invention are easy to operate, by the degree that the control of mixing speed control handle is stirred, set certain mixing time and blanking time, realize stirring automatically.
5. apparatus of the present invention can be studied the influence of stirring the PAHs photodissociation of the different soils degree of depth.After setting certain mixing speed, set mixing time and blanking time, after one section of experience is stirred the time, take out the influence of PAHs photodissociation in the research different depth soil from the different sample taps of the sidewall of containers of soil.
6. apparatus of the present invention can be convenient to study the light degradation of PAHs in the deep soil, stir by stirring, making the deep layer pollutant reach the surface accepts illumination and degrades, result of study can be that the PAHs photodegradation provides theoretical foundation in the deep soil, administers the deep layer contaminated soil for photochemistry and is difficult to biodegradable organic contamination effective measures and technology are provided.
Description of drawings
Fig. 1 is the Photodegradation device structural representation of PAHs in the pollution abatement soil of the present invention.
Fig. 2 is a containers of soil structural representation of the present invention.
The specific embodiment
Comprise soil stirring pool 1 and control module 2 as shown in Figure 1, the two ends of impeller shaft 8 are installed in the top and bottom of soil stirring pool 1 by bearing, the bottom of impeller shaft 8 passes below soil stirring pool 1, link to each other with drive motors in the control module 2, be used to stir the impeller 26 that stirs soil and be connected impeller shaft 8, soil stirring pool 1 sidewall is provided with at least one sample tap 7.
Control module 2 comprises drive motors, timer 3, mixing speed controller 4 and display screen 5, wherein timer 3 is located in the control loop of drive motors, mixing speed controller 4 is located in the major loop of drive motors, adjusting by the knob gear, change main circuit voltage with control drive motors speed, the output of timer 3 also links to each other with display screen 5.Described display screen 5 shows mixing time and blanking time.
Described soil stirring pool 1 internal diameter is 6cm, highly is 8cm, and sidewall to the top, has a sample tap every 1cm by the bottom.Impeller 6 long 5.8cm, high 4cm.(referring to Fig. 2).
The illumination degrading method:
The making of soil sample to be measured: soil sample grinds at room-dry, crosses the 1mm sieve, adopts the sodium azide sterilization, add a certain amount of polycyclic aromatic hydrocarbon after, air-dry, make soil China and Philippines, pyrene, benzo [a] pyrene respectively be 40mg/kg, stand-by.
Take by weighing the above-mentioned soil sample of 100g and place the soil stirring pool of agitating device, pave, place under the lighting box medium ultraviolet condition, the soil to be measured that soil stirring pool discontinuous stirs is shone, PAHs in eliminating soil to be measured by ultraviolet light.Illumination condition in the lighting box: ultraviolet lighting dominant wavelength is 254nm, and sample is apart from light source 40cm, and intensity of illumination is 240 μ w/cm
2, temperature is 24 ℃.
Described intermittently stirring is to wait to degrade after soil stirs 30min by the soil stirring pool, stops to stir by ultraviolet source irradiation 10min, is once and intermittently stirs.Described mixing speed maximum (500 rev/mins).
Treatment effect: will add to the contaminated soil of 40mg/kg phenanthrene, pyrene, benzo [a] pyrene and put into the soil stirring pool, after 14 days irradiation, take by weighing soil 5g, put into the 100ml centrifuge tube, add the carrene of 25ml, ultrasonic water bath 2 hours, the centrifugal 5min of 5000rmp, cross decontaminating column, nitrogen dries up, and dissolves with methyl alcohol then.Measure the content of the polycyclic aromatic hydrocarbon in the mixed liquor.The degradation rate of PAHs is not 0 in the deep soil of Jiao Baning.Stir in the soil, the degradation rate of benzo in the deep soil [a] pyrene reaches 19.14%, reaches 16.4% through the degradation rate of pyrene after 14 days the irradiation, reaches 12.85% through degradation rate luxuriant and rich with fragrance after 14 days the irradiation.
Embodiment 2
Difference from Example 1 is:
The illumination degrading method:
The making of soil sample to be measured: soil sample grinds at room-dry, crosses the 1mm sieve, adopts the sodium azide sterilization, add a certain amount of polycyclic aromatic hydrocarbon after, air-dry, make soil China and Philippines, pyrene, benzo [a] pyrene respectively be 40mg/kg, stand-by.
Take by weighing the above-mentioned soil sample of 100g and place the soil stirring pool of agitating device, pave, place under the lighting box medium ultraviolet condition, the soil to be measured that soil stirring pool discontinuous stirs is shone, PAHs in eliminating soil to be measured by ultraviolet light.Illumination condition in the lighting box: ultraviolet lighting dominant wavelength is 254nm, and sample is apart from light source 50cm, and intensity of illumination is 235 μ w/cm
2, temperature is 25 ℃.
Described intermittently stirring is to wait to degrade after soil stirs 30min by the soil stirring pool, stops to stir by ultraviolet source irradiation 20min, is once and intermittently stirs.Described mixing speed maximum (500 rev/mins).
Treatment effect: will add to the contaminated soil of 40mg/kg phenanthrene, pyrene, benzo [a] pyrene and put into the soil stirring pool, after 14 days irradiation, take by weighing soil 5g, put into the 100ml centrifuge tube, add the carrene of 25ml, ultrasonic water bath 2 hours, the centrifugal 5min of 5000rmp, cross decontaminating column, nitrogen dries up, and dissolves with methyl alcohol then.Measure the content of the polycyclic aromatic hydrocarbon in the mixed liquor.The degradation rate of PAHs is not 0 in the deep soil of Jiao Baning.Stir in the soil, the degradation rate of benzo in the deep soil [a] pyrene reaches 16.12%, reaches 14.32% through the degradation rate of pyrene after 14 days the irradiation, reaches 12.15% through degradation rate luxuriant and rich with fragrance after 14 days the irradiation.
Embodiment 3
The illumination degrading method:
The making of soil sample to be measured: soil sample grinds at room-dry, crosses the 1mm sieve, adopts the sodium azide sterilization, add a certain amount of polycyclic aromatic hydrocarbon after, air-dry, make soil China and Philippines, pyrene, benzo [a] pyrene respectively be 40mg/kg, stand-by.
Take by weighing the above-mentioned soil sample of 100g and place the soil stirring pool of agitating device, pave, place under the lighting box medium ultraviolet condition, the soil to be measured that soil stirring pool discontinuous stirs is shone, PAHs in eliminating soil to be measured by ultraviolet light.Illumination condition in the lighting box: ultraviolet lighting dominant wavelength is 254nm, and sample is apart from light source 60cm, and intensity of illumination is 230 μ w/cm
2, temperature is 26 ℃.
Described intermittently stirring is to wait to degrade after soil stirs 30min by the soil stirring pool, stops to stir by ultraviolet source irradiation 30min, is once and intermittently stirs.Described mixing speed maximum (500 rev/mins).
Treatment effect: will add to the contaminated soil of 40mg/kg phenanthrene, pyrene, benzo [a] pyrene and put into the soil stirring pool, after 14 days irradiation, take by weighing soil 5g, put into the 100ml centrifuge tube, add the carrene of 25ml, ultrasonic water bath 2 hours, the centrifugal 5min of 5000rmp, cross decontaminating column, nitrogen dries up, and dissolves with methyl alcohol then.Measure the content of the polycyclic aromatic hydrocarbon in the mixed liquor.The degradation rate of PAHs is not 0 in the deep soil of Jiao Baning.Stir in the soil, the degradation rate of benzo in the deep soil [a] pyrene reaches 12.26%, reaches 10.85% through the degradation rate of pyrene after 14 days the irradiation, reaches 11.92% through degradation rate luxuriant and rich with fragrance after 14 days the irradiation.
Claims (7)
1. the light degradation method of PAHs in the pollution abatement soil, it is characterized in that: the soil stirring pool that will take up the soil that remains to be degraded places under the ultraviolet condition, by ultraviolet light the soil to be measured that soil stirring pool discontinuous stirs is shone, PAHs in eliminating soil to be measured, wherein ultraviolet source is apart from soil 40-60cm to be measured, and intensity of illumination is 230-240 μ w/cm
2
2. by the light degradation method of PAHs in the described pollution abatement soil of claim 1, it is characterized in that: the described ultraviolet source irradiation soil to be measured that can't pass at room temperature carries out; Described ultraviolet source dominant wavelength is 254nm.
3. press the light degradation method of PAHs in the described pollution abatement soil of claim 1, it is characterized in that: described intermittently stirring is to wait to degrade after soil stirs 20-30min by the soil stirring pool, stop to stir, be once and intermittently stir by ultraviolet source irradiation 10-30min.
4. device by PAHs light degradation method in the described pollution abatement soil of claim 1, it is characterized in that: comprise control module (2) and position soil stirring pool (1) thereon, wherein be provided with in the soil stirring pool (1) and be used to stir the impeller (6) that stirs soil, impeller (6) is connected on the impeller shaft (8), the two ends of impeller shaft (8) by bearing be installed in respectively soil stirring pool (1) top and below, the lower end of impeller shaft (8) links to each other with drive motors in the control module (2); Soil stirring pool (1) sidewall is provided with sample tap (7).
5. press the device of PAHs light degradation method in the described pollution abatement soil of claim 1, it is characterized in that: described sample tap (7) is for one or more, when sample tap (7) when being a plurality of, its position is provided with one to the top every 1cm from soil stirring pool (1) sidewall bottom.
6. press the device of PAHs light degradation method in the described pollution abatement soil of claim 1, it is characterized in that: described control module (2) comprises drive motors, timer (3), mixing speed controller (4) and display screen (5), wherein timer (3) is located in the control loop of drive motors, mixing speed controller (4) is located in the major loop of drive motors, and the output of timer (3) also links to each other with display screen (5).
7. by the device of PAHs light degradation method in the described pollution abatement soil of claim 3, it is characterized in that: described display screen (5) shows mixing time and blanking time.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102335550A (en) * | 2011-08-02 | 2012-02-01 | 浙江工商大学 | Reactor for filtering PAHs (polycyclic aromatic hydrocarbons) in composite electrocatalytic oxidation treatment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102335550A (en) * | 2011-08-02 | 2012-02-01 | 浙江工商大学 | Reactor for filtering PAHs (polycyclic aromatic hydrocarbons) in composite electrocatalytic oxidation treatment |
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Application publication date: 20110727 |