CN112090952B - Boiling type micro-foam soil pollution desorption device and method suitable for coking field - Google Patents
Boiling type micro-foam soil pollution desorption device and method suitable for coking field Download PDFInfo
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Abstract
The invention discloses a boiling type micro-foam soil pollution desorption device and a boiling type micro-foam soil pollution desorption method suitable for a coking field, wherein the device comprises a pollutant desorption device, an ozone conveying pipeline, an air flow conveying pipeline, a micro-foam generating device and a waste gas and waste liquid collecting device, wherein the ozone conveying pipeline is connected with an ozone inlet of the pollutant desorption device and is used for providing ozone for the pollutant desorption device so as to oxidize organic pollutants in coking soil; the air flow conveying pipeline is connected with an air flow inlet of the pollutant desorption device and provides air flow for the pollutant desorption device so as to realize soil fluidization and boiling; the micro-foam generating device is connected with the foam inlet; the waste gas and waste liquid collecting device is respectively connected with the waste liquid outlet and the waste gas outlet; the desorption method comprises three stages: (1) ozone oxidation and soil boiling, starting an ozone conveying pipeline and an airflow conveying pipeline; (2) eluting surfactant microfoam, closing an ozone conveying pipeline and an air flow conveying pipeline, and starting a microfoam generating device; (3) and collecting waste gas and waste liquid.
Description
Technical Field
The invention relates to a contaminated site soil remediation technology, in particular to a boiling type micro-foam soil pollution desorption device and method suitable for a coking site.
Background
In the process of repairing the polluted soil, the polycyclic aromatic hydrocarbon has strong lipophilicity, so that once pollution is generated, a polluted medium is difficult to repair, and the polycyclic aromatic hydrocarbon has low water solubility and large water distribution coefficient of n-octanol and is easy to enrich in organisms and lipid substances. At present, the research on the soil polycyclic aromatic hydrocarbon pollution remediation technology at home and abroad is relatively wide, and in the existing soil remediation technology, the chemical leaching method is widely applied to remediation of the organic polluted soil due to simple operation, low cost and good remediation effect. However, in the leaching process, a pore channel effect is easy to occur, that is, the leacheate flows along the soil pore channel with good permeability preferentially, is greatly influenced by the soil permeability, and is easy to generate fixed channel flow, so that pollutants cannot be effectively removed, the remediation effect is not ideal, and the consumption of the leacheate is high.
In order to solve the problems of chemical leaching, the invention proposes to use a micro-foam washing technology to replace the chemical leaching. The micro-foam is foam with the diameter of hundreds of nanometers to 10 micrometers when the foam is generated, has large specific surface area, high mass transfer efficiency and long retention time in water, and can generate a large amount of free radicals. In addition, since the foam flow rate can be controlled by the pressure gradient, foam delivery allows greater control over the amount of fluid injected, thereby minimizing contaminant diffusion.
Researches show that a stable foam surfactant gas-liquid mixing system can more efficiently restore organic contaminated soil and greatly reduce the treatment cost of the contaminated soil, the invention for removing soil pollutants by using a surfactant foam flushing technology is provided, for example, a patent (CN 108607879A) named as a system and a method for restoring the organic contaminated soil by oxidizing persulfate assisted by surfactant foam is disclosed, the method comprises the steps of generating foam by a foam generating system through a medicament mixture, pressurizing and conveying the foam to a reaction system to react with pollutants in the soil so as to achieve the purpose of degrading the organic pollutants, and the reacted foam mixture is recycled and reused through a recycling treatment system. The system is suitable for soil in-situ remediation, but the surfactant adsorbed on the soil is difficult to remove, and whether foam residue exists in the soil cannot be determined. In the in-situ injection process, the foam is extruded by soil during injection and is easy to break to recover the liquid state, so that various problems existing in the chemical leaching method still cannot be avoided.
In the prior invention, a micro-foam generating device is improved, a micro-foam desorption device is less and not mature enough, and foam injection is uneven, for example, the invention patent with the publication number of CN 102371268B is named as a surfactant foam flushing technology for restoring polychlorinated biphenyl polluted soil, the invention uses a surfactant and nitrogen to manufacture ectopic foam, controls the property of the foam by controlling the gas-liquid ratio and the particle size of the foam, and flushes the foam in a pressurizing injection mode. In the invention, the foam has poor stability in the soil column, exists stably in the form of the foam only in a certain distance from the top end of the column, is almost equal to the effect of chemical leaching at the bottom end of the soil column, and is still influenced by the pore channel effect.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a boiling type micro-foam soil pollution desorption device and method suitable for a coking field, which realize the removal of organic matters such as polycyclic aromatic hydrocarbon in soil by adopting the technology of synergy of ozone oxidation and air flow impact for boiling the soil and ultrasonic vibration.
In order to achieve the purpose, the invention adopts the following technical scheme:
the boiling type micro-foam soil pollution desorption device suitable for a coking field comprises a pollutant desorption device, an ozone conveying pipeline, an air flow conveying pipeline, a micro-foam generating device and a waste gas and waste liquid collecting device, wherein the pollutant desorption device comprises a chassis, the chassis consists of a support and a funnel-shaped groove fixed at the center of the support, and the bottom surface of the funnel-shaped groove is provided with an air flow inlet, a foam inlet and a waste liquid outlet; an elution reaction chamber is arranged at the upper part of the bracket, a porous bearing plate is arranged at the bottom of the elution reaction chamber, a plurality of micropores and a plurality of airflow branch openings are arranged on the porous bearing plate, the lower ends of the airflow branch openings are respectively connected with the air outlet end of the airflow inlet through airflow branch pipes, airflow circulation baffles are arranged on the airflow branch openings, and the bottoms of the airflow circulation baffles are fixed on the porous bearing plate; a top cover is arranged at the top of the elution reaction chamber; the top cover is provided with an ozone inlet, a foam backflow port and a waste gas outlet, and the pollutant desorption device is arranged in the ultrasonic vibration container; the ozone conveying pipeline comprises an ozone generator, a gas input end of the ozone generator is connected with an oxygen cylinder, a gas output end of the ozone generator is connected with an ozone inlet through an ozone pipeline, and a first one-way valve is arranged on the ozone pipeline and used for providing ozone for a pollutant desorption device to oxidize organic pollutants in the coking soil; the air flow conveying pipeline comprises a first air pump, the first air pump is connected with the air flow inlet through an air flow pipeline and provides air flow for the pollutant desorption device so as to realize soil fluidization and boiling; the micro-foam generating device comprises a foaming agent conveying pipeline and an air conveying pipeline, wherein the foaming agent conveying pipeline comprises a peristaltic pump, an input port of the peristaltic pump extends into the surfactant container through a liquid pipeline, an output end of the peristaltic pump is connected with a first end of the tee joint through the liquid pipeline, and a second one-way valve is arranged on the peristaltic pump and the liquid pipeline of the tee joint; the air conveying pipeline comprises a second air pump, the second air pump is connected with a second end of a tee joint through a gas pipeline, a third end of the tee joint is connected with one end of the porous consolidation sand core through a foam pipeline, the other end of the porous consolidation sand core is connected with the lower end of a foam buffer container through a foam pipeline, the upper end of the foam buffer container is connected with a foam inlet through the foam pipeline, meanwhile, the upper end of the foam buffer container is connected with a foam backflow port through a foam backflow pipeline, and a third one-way valve is arranged on the foam backflow pipeline; waste gas waste liquid collection device includes waste gas collecting bottle and waste liquid absorption bottle, the waste gas collecting bottle passes through waste gas pipeline and exhaust outlet, the waste liquid absorption bottle passes through waste liquid pipeline and waste liquid exit linkage to be equipped with the vacuum pump on waste liquid pipeline.
The ozone has strong oxidizing ability, high speed of degrading organic pollutants, mild reaction condition and no secondary pollutants. The ultrasonic vibration can remove polycyclic aromatic hydrocarbon contained in soil micropores by utilizing the principle of capillary action, the surfactant microfoam emulsion is vibrated and decomposed by utilizing the ultrasonic wave to form smaller liquid drops so as to be convenient for moving, and the soil boiling is realized by the air flow impact so as to efficiently elute pollutants. The invention introduces ultrasonic vibration and ozone, combines oxidation and micro-foam leaching to achieve higher organic matter removal rate and reduce the usage amount of leacheate.
Further, a first flowmeter is arranged on an ozone pipeline between a first one-way valve and an ozone inlet in the ozone conveying pipeline and used for metering ozone flow; a second flowmeter is arranged on an airflow pipeline between the first air pump and the airflow inlet in the airflow conveying pipeline and is used for metering the flow of the first air pump; a third flow meter is arranged on a liquid pipeline between a second one-way valve in the foaming agent conveying pipeline and the first end of the tee joint and used for metering the flow of the surfactant; and a fourth flow meter is arranged on a gas pipeline between the second air pump in the air conveying pipeline and the second end of the tee joint and used for metering the flow of the second air pump.
Furthermore, the airflow circulating baffle is umbrella-shaped; the aperture of the micropores is less than 0.1mm, and a plurality of micropores and a plurality of airflow branch ports are mutually spaced and uniformly distributed on the porous bearing plate; and a first valve is arranged on the vacuum pump and a waste liquid pipeline of the waste liquid outlet, and a second valve is arranged on the foam buffer container and a pipeline of the foam inlet.
Furthermore, a nylon net with 100 meshes is arranged between the top end of the elution reaction chamber and the top cover; the elution reaction chamber and the top cover as well as the elution reaction chamber and the bottom plate are movably connected.
Still further, the aperture of the porous consolidated sand core is 0.01 mm.
Furthermore, activated carbon is arranged in the waste gas collecting bottle; and a waste liquid adsorbent is arranged in the waste liquid absorption bottle.
The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device comprises the following steps:
(1) paving the polluted soil: opening the top cover, and spreading the polluted soil of the coking field to be desorbed on a porous bearing plate at the bottom of the elution reaction chamber;
(2) ozone oxidation and soil "boiling": starting an ozone generator in the ozone conveying pipeline, enabling ozone output by the ozone generator to enter an elution reaction chamber through an ozone inlet, adjusting the flow of the ozone, and oxidizing organic matters in the soil polluted by the coking field; simultaneously starting a first air pump of the air flow conveying pipeline, sending air into the plurality of air flow branch ports from the air flow inlet by the first air pump, uniformly distributing air through the air flow circulating baffle, controlling the flow of the first air pump to realize soil boiling, and accelerating the escape of volatile organic compounds to the waste gas outlet;
(3) surfactant microfoam elution: closing the ozone generator and the first air pump to ensure that the first valve is closed, opening a second valve on the foam pipeline, opening a peristaltic pump in the foaming agent conveying pipeline, pumping the surfactant solution, simultaneously starting a second air pump of the air conveying pipeline to output air, mixing the surfactant solution with the air through a tee joint, controlling the gas-liquid ratio of the air output by the second air pump and the pumped surfactant solution to generate micro-foam at the porous consolidation sand core, temporarily storing the micro-foam in a foam buffer container, then injecting a pollutant desorption device into a foam inlet, closing the peristaltic pump, the second air pump and the second valve after the whole elution reaction chamber is filled with the pollutant desorption device, opening the first valve, placing the desorption device in an ultrasonic vibration container, opening the ultrasonic vibration of the ultrasonic vibration container to desorb the organic matters in the polluted soil of the coking site, wherein the first valve is arranged on a waste liquid pipeline between the vacuum pump and the waste liquid outlet, and the second valve is arranged on a pipeline between the foam buffer container and the foam inlet. And the foam is supplemented in time in the desorption process of the pollutants.
(4) Collecting waste gas and waste liquid: waste gas in the elution process enters a waste gas collecting bottle from a waste gas outlet and is adsorbed by activated carbon;
after the elution is finished, closing the ultrasonic vibration of the ultrasonic vibration container; opening the vacuum pump, taking the waste liquid that the elution process produced out through the vacuum pump to collect by the waste liquid receiving flask, adopt the waste liquid absorbent to carry out the processing of defoaming and pollutant, the waste liquid absorbent is polycyclic aromatic hydrocarbon degradation bacterial suspension.
The invention provides a boiling type high-efficiency microfoam desorption technology suitable for a coking field, which adopts a staged removal method for pollutants with different properties: oxidation and sterilization before desorption are realized by ozone; aiming at volatile organic compounds, the soil in the device is boiled by utilizing the airflow impact, and the brownian motion of volatile gas is enhanced in the continuous motion process of soil particles, so that the volatile gas is separated from the soil medium more quickly. The surfactant solution is converted into the micro-foam, the micro-foam is used for soaking the polluted soil under ultrasonic vibration, the flowing speed of the leacheate is reduced, the integral sweep efficiency is improved, the pore effect similar to that generated in the soil column leaching is avoided, and the using amount of the leacheate is saved.
Further, in the (2) ozone oxidation and soil boiling, the flow rate of ozone in the ozone conveying pipeline is 0.1-0.3L/min; the air flow in the air flow conveying pipeline is 90-120L/min; the implementation time of ozone oxidation and soil boiling is 2-5 min.
Further, in the surfactant microfoam elution in the step (3), the gas-liquid ratio of the air output by the second air pump to the pumped surfactant solution is 3.3-20: 1; the ultrasonic vibration frequency of the ultrasonic vibration container is 40 KHz; and starting ultrasonic vibration of the ultrasonic vibration container, wherein the desorption time of the organic matters in the polluted soil in the coking field is 30-60 min.
Further, the (1) coking site polluted soil in the polluted soil laying is paved to a thickness not exceeding 2/3 of the height of the airflow circulating baffle plate.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can realize the staged treatment of volatile organic compounds and organic compounds adsorbed on soil, the soil is boiled by the air flow input by the air flow conveying pipeline, the air flow circulation baffle ensures the uniform distribution of the air flow, and the volatile organic compounds are removed by the action of the air flow.
2. The surfactant is applied to the ectopic remediation of the polluted soil in the coking field in the form of micro-foam, the surfactant is fully contacted with the pollutants in the soil, the dissolution efficiency of the pollutants is high, the leaching time is shortened, and the cost is low. Foams with uniform size and stable properties can be generated through the porous consolidation sand core, and foams with different pore diameters can be generated by replacing the sand core.
3. The boiling type micro-foam soil pollution desorption device ensures that the soil is eluted without dead angles, micro-foam homogenization is realized through the porous consolidation sand core and the porous bearing plate, and the whole elution reaction chamber is filled with foam in the pollutant elution process, so that the soil is fully immersed without dead angles; ultrasonic vibration makes soil and foam fully contact, has improved the desorption efficiency of pollutant. Simultaneously, the device is equipped with waste gas waste liquid collection device, can effectively avoid secondary pollution.
Drawings
Fig. 1 is a schematic structural diagram of the boiling type micro-foam soil pollution desorption device of the invention.
FIG. 2 is a schematic structural diagram of a bracket, a funnel-shaped groove and a porous supporting plate in the boiling type micro-foam soil pollution removing device.
Wherein, 1-an oxygen bottle, 2-an ozone generator, 3-a first one-way valve, 4-a first flowmeter, 5-a first air pump, 6-a second flowmeter, 7-a surfactant container, 8-a peristaltic pump, 9-a second one-way valve, 10-a third flowmeter, 11-a tee joint, 12-a second air pump, 13-a fourth flowmeter, 14-a porous consolidation sand core, 15-a foam buffer container, 16-a support, 17-a funnel-shaped groove, 18-an air flow inlet, 19-a foam inlet, 20-a waste liquid outlet, 21-an ozone inlet, 22-a foam reflux port, 23-a waste gas outlet, 24-a porous supporting plate, 25-an air flow circulating baffle, 26-an elution reaction chamber and 27-an ultrasonic vibration container, 28-vacuum pump, 29-waste liquid absorption bottle, 30-waste gas collection bottle, 31-first valve, 32-second valve, 33-third one-way valve, 34-micropore, 35-airflow branch port and 36-top cover.
Detailed Description
The technical scheme of the invention is further explained by the specific embodiment in combination with the attached drawings. It should be understood by those skilled in the art that the specific embodiments are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
As shown in fig. 1, the boiling type micro-foam soil pollution desorption device suitable for a coking field comprises a pollutant desorption device, an ozone conveying pipeline, an air flow conveying pipeline, a micro-foam generation device and a waste gas and waste liquid collection device, wherein the pollutant desorption device comprises a chassis, the chassis consists of a bracket 16 and a funnel-shaped groove 17 fixed in the center of the bracket, the bottom surface of the funnel-shaped groove is provided with an air flow inlet 18, a foam inlet 19 and a waste liquid outlet 20, and the air outlet end of the air flow inlet is provided with a plurality of small connectors; an elution reaction chamber 26 is arranged at the upper part of the bracket, a porous supporting plate 24 is arranged at the bottom of the elution reaction chamber 26, a plurality of micropores 34 and airflow branch ports 35 with the number equal to that of the small ports are arranged on the porous supporting plate 24, the lower ends of the airflow branch ports 35 are connected with the small ports at the air outlet end of the airflow inlet 18 through airflow branch pipes, an airflow circulating baffle 25 is arranged above the airflow branch ports 35, and the bottom of the airflow circulating baffle 25 is fixed on the porous supporting plate 24; a top cover 36 is arranged at the top of the elution reaction chamber 26; the top cover 36 is provided with an ozone inlet 21, a foam backflow port 22 and a waste gas outlet 23, and the pollutant desorption device is arranged in the ultrasonic vibration container 27; the ozone conveying pipeline comprises an ozone generator 2, a gas input end of the ozone generator 2 is connected with an oxygen cylinder 1, a gas output end of the ozone generator is connected with an ozone inlet 21 through an ozone pipeline, a first one-way valve 3 and a first flow meter 4 are arranged on the ozone pipeline and used for measuring the ozone flow, and ozone is provided for a pollutant desorption device and used for oxidizing organic pollutants in coking soil; the air flow conveying pipeline comprises a first air pump 5, the first air pump 5 is connected with an air flow inlet 18 through an air flow pipeline, a second flow meter 6 is arranged on the air flow pipeline and used for metering the flow of the first air pump, and air flow is provided for a pollutant desorption device to realize soil fluidization and boiling; the microfoam generating device comprises a foaming agent conveying pipeline and an air conveying pipeline, the foaming agent conveying pipeline comprises a peristaltic pump 8, an input port of the peristaltic pump 8 extends into the surfactant container 7 through a liquid pipeline, an output end of the peristaltic pump 8 is connected with a first end of a tee joint 11 through a liquid pipeline, and a second one-way valve 9 and a third flow meter 10 are arranged on the liquid pipelines of the peristaltic pump 8 and the tee joint 11 and used for metering the flow of the surfactant; the air conveying pipeline comprises a second air pump 12, the second air pump 12 is connected with the second end of the tee joint 11 through a gas pipeline, and a fourth flow meter 13 is arranged on the gas pipeline and used for metering the flow of the second air pump; the third end of the tee joint 11 is connected with one end of a porous consolidation sand core 14 through a foam pipeline, the other end of the porous consolidation sand core 14 is connected with the lower end of a foam buffer container 15 through a foam pipeline, the upper end of the foam buffer container 15 is connected with a foam inlet 19 through a foam pipeline, a second valve 32 is arranged on the foam pipeline, meanwhile, the upper end of the foam buffer container 15 is connected with a foam return port 22 through a foam return pipeline, and a third one-way valve 33 is arranged on the foam return pipeline; waste gas waste liquid collection device includes waste gas receiving flask 30 and waste liquid absorption bottle 29, waste gas receiving flask 30 passes through the waste gas pipeline and is connected with exhaust outlet 23, waste liquid absorption bottle 29 passes through the waste liquid pipeline and is connected with waste liquid outlet 20 to be equipped with vacuum pump 28 on the waste liquid pipeline, be equipped with first valve 31 on the waste liquid pipeline of vacuum pump 28 and waste liquid export.
Wherein, the airflow circulating baffle 25 is umbrella-shaped; the aperture of the micropores 34 is less than 0.1mm, and the micropores 34 and the airflow branch ports 35 are spaced from each other and uniformly distributed on the porous bearing plate 24.
A nylon net with 100 meshes is arranged between the top end of the elution reaction chamber and the top cover; the elution reaction chamber 26 is connected with the top cover 36 by screws or can be connected by a bolt structure and threads; the elution reaction chamber 26 is connected with the chassis by screws, or can be in a bolt structure and is in screwed connection by threads;
the aperture of the porous consolidated sand core 14 is 0.01 mm.
A waste liquid absorbent is arranged in the waste liquid absorption bottle 29, and can be selected according to the components of the desorbed pollutants; in this embodiment, the waste liquid absorbent is a suspension of polycyclic aromatic hydrocarbon degrading bacteria, and the waste gas collecting bottle 30 is provided with activated carbon therein.
The soil pollution desorption method using the boiling type microfoam soil pollution desorption device of the invention relates to parameters of ozone flow in an ozone conveying pipeline, air flow in an air flow conveying pipeline, gas-liquid ratio in a foaming agent conveying pipeline, ultrasonic vibration and the like, and the following examples 2-4 mainly verify the elution effect of the soil pollution desorption method of the invention on polycyclic aromatic hydrocarbon, and simultaneously compare the change of polycyclic aromatic hydrocarbon removal effect, the foam stability formed by different gas-liquid ratios, the solubilization effect of polycyclic aromatic hydrocarbon and the influence of ultrasonic vibration effect on the pollutant elution effect after the air flow is introduced to boil the soil. The foam stability is determined by a half-life method, and the polycyclic aromatic hydrocarbon content is determined by a High Performance Liquid Chromatograph (HPLC).
Example 2
The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device of the invention firstly assembles the desorption device:
connecting an ozone conveying pipeline: a silicone tube is sequentially connected with an oxygen cylinder 1, an ozone generator 2, a first one-way valve 3 and a first flowmeter 4 and is connected with an ozone inlet 21;
connecting an airflow conveying pipeline: a silica gel tube is connected with the first air pump 5 and the second flowmeter 6 and is connected with the airflow inlet 18;
connecting the foam generating device: adding the selected surfactant solution into a surfactant container 7, wherein one end of a peristaltic pump 8 extends into the surfactant solution, and the other end of the peristaltic pump is connected with a second one-way valve 9 and a third flowmeter 10 in sequence through a silica gel tube and then connected to the first end of a tee joint 11; connecting a second air pump 12 and a fourth flowmeter 13 in sequence by a silicone tube and then connecting the two to a second end of the tee joint 11; a third end interface of the tee joint 11 is sequentially connected to the lower ends of the porous consolidation sand core 14 and the foam buffer container 15 and the foam inlet 19 through a silicone tube;
and fourthly, connecting a pollutant desorption device: the small port at the air outlet end of the airflow inlet 18 is connected with an airflow branch port 35 on the porous bearing plate 24 through a thin tube, the chassis and the elution reaction chamber 26 are screwed through a bolt structure, a layer of sieved coking site polluted soil is paved in the elution reaction chamber 26, a layer of 100-mesh nylon net is clamped between the top end of the elution reaction chamber 26 and a top cover 36, the top cover 36 and the elution reaction chamber 26 are screwed through the bolt structure, and the desorption device is placed in the ultrasonic vibration container 27.
The waste gas and liquid collecting device is connected: the exhaust gas collecting means is connected to the exhaust gas outlet 23 provided on the top cover 36. Connect waste liquid collecting flask, vacuum pump, be connected with waste liquid export 20.
After the desorption device is assembled, the elution reaction chamber 26 is a closed space during the whole desorption process.
The soil pollution desorption method specifically comprises the following steps:
(1) paving the polluted soil: collecting polluted soil of a certain coking site in the Taiyuan city, freeze-drying, grinding, sieving by a 2mm sieve, and flatly paving the soil on a porous bearing plate at the bottom of an elution reaction chamber, wherein the thickness of the flatly paved soil is not more than 2/3 of the height of an airflow circulating baffle;
(2) ozone oxidation and soil "boiling": starting an ozone generator in an ozone conveying pipeline, enabling ozone output by the ozone generator to enter an elution reaction chamber from an ozone inlet, adjusting the flow of the ozone to be 0.3L/min, and oxidizing organic matters in the soil polluted by the coking field; simultaneously starting a first air pump of the air flow conveying pipeline, sending air into the plurality of air flow branch openings from the air flow inlet by the first air pump, uniformly distributing air through the air flow circulating baffle, and adjusting the air flow of the air flow conveying pipeline to be 90L/min to realize the boiling of soil; the implementation time of ozone oxidation and soil boiling is 3 min;
(3) surfactant microfoam elution: the ozone generator and the first air pump are closed to ensure that the first valve is closed, the second valve on the foam pipeline is opened, the peristaltic pump in the foaming agent conveying pipeline is opened, the surfactant solution is pumped in (the surfactant solution is 20mmol/L Tween 80 aqueous solution), meanwhile, the second air pump of the air conveying pipeline is started to output air, the surfactant solution is mixed with the air through the tee joint, and the gas-liquid ratio of the air output by the second air pump to the pumped surfactant solution is controlled to be 3.3: 1, generating micro-foam at a porous consolidation sand core, temporarily storing the micro-foam in a foam buffer container, injecting a pollutant desorption device from a foam inlet, closing a peristaltic pump, a second air pump and a second valve after the whole elution reaction chamber is filled with the pollutant desorption device, opening the first valve, placing the desorption device in an ultrasonic vibration container (the ultrasonic vibration frequency is 40KHz), starting the ultrasonic vibration of the ultrasonic vibration container, desorbing organic matters (polycyclic aromatic hydrocarbons) in the polluted soil of a coking site, timely supplementing the foam in the pollutant desorption process, and keeping the desorption time at 30 min; wherein the first valve is arranged on a waste liquid pipeline between the vacuum pump and the waste liquid outlet, and the second valve is arranged on a pipeline between the foam buffer container and the foam inlet;
(4) collecting waste gas and waste liquid: waste gas in the elution process enters a waste gas collecting bottle from a waste gas outlet and is adsorbed by activated carbon;
after the elution is finished, closing the ultrasonic vibration of the ultrasonic vibration container; and opening a vacuum pump, pumping out the waste liquid generated in the elution process through the vacuum pump, collecting the waste liquid by a waste liquid collecting bottle, and defoaming and treating pollutants by adopting a waste liquid absorbent (the waste liquid absorbent is polycyclic aromatic hydrocarbon degrading bacteria suspension).
And (3) measuring the content of the polycyclic aromatic hydrocarbon in the desorbed soil by using a High Performance Liquid Chromatograph (HPLC), wherein the measurement parameters are as follows:
the mobile phase A is ultrapure water, and the mobile phase B is acetonitrile. The gradient elution program was set up as: 0-2.0 min, mobile phase A, B volume ratio (V)A:VB)＝3:7；2.0～28.0min，VA:VB＝1:9；28.0～28.5min，VA:VB＝3:7；28.5～35.0min，VA:VB3: 7. The sample volume is 10 mu L, the column temperature is 35 ℃, and the flow rate is 1 mL/min. The test results are shown in table 1.
Example 3
The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device of the invention has the same steps as the embodiment 2, and the differences are only that: and adjusting the flow of the gas flow conveying pipeline to be 120L/min, and after the desorption is finished, measuring the content of the polycyclic aromatic hydrocarbon in the desorbed soil by using a High Performance Liquid Chromatography (HPLC) instrument, wherein the measurement parameter setting is the same as that in example 2. The test results are shown in table 1.
Example 4
The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device of the invention has the same steps as the embodiment 2, and the differences are only that: the flow rate of the air flow conveying pipeline is adjusted to be 0L/min, namely, the soil pollution desorption is carried out without boiling. After the desorption, the polycyclic aromatic hydrocarbon content of the desorbed soil is measured by High Performance Liquid Chromatography (HPLC) and the measurement parameters are set as in example 2. The test results are shown in table 1.
Table 1:
it can be seen from the data of examples 2-4 that when the air flow in the air flow conveying pipeline in the volatile organic compound removal stage is 0, only foam elution is performed, and the removal rate of polycyclic aromatic hydrocarbon is low; the boiling process can enhance the movement of soil and improve the removal efficiency of polycyclic aromatic hydrocarbon.
Example 5
The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device of the invention has the same steps as the embodiment 2, and the differences are only that: adjusting the air flow of the air flow conveying pipeline to be 100L/min and the ozone flow to be 0.2L/min; the implementation time of oxidation and soil boiling is 2 min; the desorption time is 40 min; after the desorption, the polycyclic aromatic hydrocarbon content of the desorbed soil is measured by High Performance Liquid Chromatography (HPLC) and the measurement parameters are set as in example 2. The test results are shown in table 2.
Example 6
The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device of the invention has the same steps as the embodiment 2, and the differences are only that: adjusting the air flow of the air flow conveying pipeline to be 100L/min and the ozone flow to be 0.2L/min; controlling the gas-liquid ratio of the air output by the second air pump to the pumped surfactant solution to be 10: 1, the implementation time of oxygen oxidation and soil boiling is 2 min; the desorption time is 40 min; after the desorption, the polycyclic aromatic hydrocarbon content of the desorbed soil is measured by High Performance Liquid Chromatography (HPLC) and the measurement parameters are set as in example 2. The test results are shown in table 2.
Example 7
The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device of the invention has the same steps as the embodiment 2, and the differences are only that: adjusting the air flow of the air flow conveying pipeline to be 100L/min and the ozone flow to be 0.2L/min; controlling the gas-liquid ratio of the air output by the second air pump to the pumped surfactant solution to be 20:1, the implementation time of oxygen oxidation and soil boiling is 2 min; the desorption time is 40 min; after the desorption, the polycyclic aromatic hydrocarbon content of the desorbed soil is measured by High Performance Liquid Chromatography (HPLC) and the measurement parameters are set as in example 2. The test results are shown in table 2.
Table 2:
as can be seen from the data of examples 5-7, the difference of the gas-liquid ratio during the foam generation process causes the difference of the removal rate of polycyclic aromatic hydrocarbons, which indicates that the gas-liquid ratio during the foam generation process is a key factor influencing the foam property. Within a certain range, the polycyclic aromatic hydrocarbon removal rate is increased along with the reduction of the gas-liquid ratio (namely, the increase of the content of the surfactant).
Example 8
The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device of the invention has the same steps as the embodiment 2, and the differences are only that: adjusting the air flow of the air flow conveying pipeline to be 120L/min and the ozone flow to be 0.1L/min; the implementation time of ozone oxidation and soil boiling is 5 min; the desorption time is 60 min; after the desorption, the polycyclic aromatic hydrocarbon content of the desorbed soil is measured by High Performance Liquid Chromatography (HPLC) and the measurement parameters are set as in example 2. The test results are shown in table 3.
Example 9
The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device of the invention has the same steps as the embodiment 2, and the differences are only that: adjusting the air flow rate of the air flow conveying pipeline to be 120L/min; the flow rate of ozone is 0.1L/min; ultrasonic vibration is not adopted; the implementation time of ozone oxidation and soil boiling is 5 min; the desorption time is 60 min; after the desorption, the polycyclic aromatic hydrocarbon content of the desorbed soil is measured by High Performance Liquid Chromatography (HPLC) and the measurement parameters are set as in example 2. The test results are shown in table 3.
Example 10
The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device of the invention has the same steps as the embodiment 2, and the differences are only that: the flow rate of ozone is 0; adjusting the air flow rate of the air flow conveying pipeline to be 120L/min; the implementation time of ozone oxidation and soil boiling is 5 min; the desorption time is 60 min; after the desorption, the polycyclic aromatic hydrocarbon content of the desorbed soil is measured by High Performance Liquid Chromatography (HPLC) and the measurement parameters are set as in example 2. The test results are shown in table 3.
Example 11
The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device of the invention has the same steps as the embodiment 2, and the differences are only that: the flow rate of ozone is 0; adjusting the air flow rate of the air flow conveying pipeline to be 120L/min; ultrasonic vibration is not adopted; the implementation time of ozone oxidation and soil boiling is 5 min; the desorption time is 60 min; after the desorption, the polycyclic aromatic hydrocarbon content of the desorbed soil is measured by High Performance Liquid Chromatography (HPLC) and the measurement parameters are set as in example 2. The test results are shown in table 3.
Table 3:
it can be seen from the data of examples 8-11 that, under the conditions of no ozone introduction and no ultrasonic vibration, only soil boiling and foam elution are performed, and the polycyclic aromatic hydrocarbon removal rate reaches 28.2%, while in the traditional washing experiment with tween 80 surfactant, the polycyclic aromatic hydrocarbon removal rate is only about 25.7%, which indicates that the foam elution improves the polycyclic aromatic hydrocarbon removal rate, and further enhances the polycyclic aromatic hydrocarbon removal effect after the ozone and ultrasonic vibration are added.
Claims (10)
1. Boiling type microfoam soil pollution desorption device suitable for coking field, its characterized in that: the device comprises a pollutant desorption device, an ozone conveying pipeline, an air flow conveying pipeline, a micro-foam generating device and a waste gas and waste liquid collecting device, wherein the pollutant desorption device comprises a chassis, the chassis consists of a bracket and a funnel-shaped groove fixed in the center of the bracket, and the bottom surface of the funnel-shaped groove is provided with an air flow inlet, a foam inlet and a waste liquid outlet; an elution reaction chamber is arranged at the upper part of the bracket, a porous bearing plate is arranged at the bottom of the elution reaction chamber, a plurality of micropores and a plurality of airflow branch openings are arranged on the porous bearing plate, the lower ends of the airflow branch openings are respectively connected with the air outlet end of the airflow inlet through airflow branch pipes, airflow circulation baffles are arranged on the airflow branch openings, and the bottoms of the airflow circulation baffles are fixed on the porous bearing plate; a top cover is arranged at the top of the elution reaction chamber; the top cover is provided with an ozone inlet, a foam backflow port and a waste gas outlet, and the pollutant desorption device is arranged in the ultrasonic vibration container; the ozone conveying pipeline comprises an ozone generator, a gas input end of the ozone generator is connected with an oxygen cylinder, a gas output end of the ozone generator is connected with an ozone inlet through an ozone pipeline, and a first one-way valve is arranged on the ozone pipeline and used for providing ozone for a pollutant desorption device to oxidize organic pollutants in the coking soil; the air flow conveying pipeline comprises a first air pump, the first air pump is connected with the air flow inlet through an air flow pipeline and provides air flow for the pollutant desorption device so as to realize soil fluidization and boiling; the micro-foam generating device comprises a foaming agent conveying pipeline and an air conveying pipeline, wherein the foaming agent conveying pipeline comprises a peristaltic pump, an input port of the peristaltic pump extends into the surfactant container through a liquid pipeline, an output end of the peristaltic pump is connected with a first end of the tee joint through the liquid pipeline, and a second one-way valve is arranged on the peristaltic pump and the liquid pipeline of the tee joint; the air conveying pipeline comprises a second air pump, the second air pump is connected with a second end of a tee joint through a gas pipeline, a third end of the tee joint is connected with one end of the porous consolidation sand core through a foam pipeline, the other end of the porous consolidation sand core is connected with the lower end of a foam buffer container through a foam pipeline, the upper end of the foam buffer container is connected with a foam inlet through the foam pipeline, meanwhile, the upper end of the foam buffer container is connected with a foam backflow port through a foam backflow pipeline, and a third one-way valve is arranged on the foam backflow pipeline; waste gas waste liquid collection device includes waste gas collecting bottle and waste liquid absorption bottle, the waste gas collecting bottle passes through waste gas pipeline and exhaust outlet, the waste liquid absorption bottle passes through waste liquid pipeline and waste liquid exit linkage to be equipped with the vacuum pump on waste liquid pipeline.
2. The boiling type micro-foam soil pollution desorption device suitable for the coking field according to claim 1, is characterized in that: the ozone pipeline between the first one-way valve and the ozone inlet in the ozone conveying pipeline is provided with a first flowmeter for metering the ozone flow; a second flowmeter is arranged on an airflow pipeline between the first air pump and the airflow inlet in the airflow conveying pipeline and is used for metering the flow of the first air pump; a third flow meter is arranged on a liquid pipeline between a second one-way valve in the foaming agent conveying pipeline and the first end of the tee joint and used for metering the flow of the surfactant; a fourth flow meter is arranged on a gas pipeline between a second air pump in the air conveying pipeline and the second end of the tee joint and used for metering the flow of the second air pump; and a first valve is arranged on the vacuum pump and a waste liquid pipeline of the waste liquid outlet, and a second valve is arranged on the foam buffer container and a pipeline of the foam inlet.
3. The boiling type micro-foam soil pollution desorption device suitable for the coking field according to claim 1, is characterized in that: the airflow circulating baffle is umbrella-shaped; the aperture of the micropores is less than 0.1mm, and a plurality of micropores and a plurality of airflow branch ports are mutually spaced and uniformly distributed on the porous bearing plate; the air outlet end of the air inlet is provided with small connectors with the number equal to that of the air branch openings, and the lower ends of the air branch openings are connected with the small connectors of the air outlet end of the air inlet through air branch pipes.
4. The boiling type micro-foam soil pollution desorption device suitable for the coking field according to claim 1, is characterized in that: a nylon net with 100 meshes is arranged between the top end of the elution reaction chamber and the top cover; the elution reaction chamber and the top cover as well as the elution reaction chamber and the bottom plate are movably connected.
5. The boiling type micro-foam soil pollution desorption device suitable for the coking field according to claim 1, is characterized in that: the aperture of the porous consolidation sand core is 0.01 mm.
6. The boiling type micro-foam soil pollution desorption device suitable for the coking field according to claim 1, is characterized in that: the waste gas collecting bottle is internally provided with activated carbon; and a waste liquid absorbent is arranged in the waste liquid absorption bottle.
7. The soil pollution desorption method using the boiling type microfoam soil pollution desorption apparatus as set forth in any one of claims 1 to 6, which is characterized in that: the method comprises the following steps:
(1) paving the polluted soil: opening the top cover, and spreading the polluted soil of the coking field to be desorbed on a porous bearing plate at the bottom of the elution reaction chamber;
(2) ozone oxidation and soil "boiling": starting an ozone generator in the ozone conveying pipeline, enabling ozone output by the ozone generator to enter an elution reaction chamber through an ozone inlet, adjusting the flow of the ozone, and oxidizing organic matters in the soil polluted by the coking field; simultaneously starting a first air pump of the air flow conveying pipeline, sending air into the plurality of air flow branch openings from the air flow inlet by the first air pump, uniformly distributing air through the air flow circulating baffle plate, and adjusting the air flow of the air flow conveying pipeline to realize 'boiling' of soil;
(3) surfactant microfoam elution: closing the ozone generator and the first air pump to ensure that the first valve is closed, opening a second valve on the foam pipeline, opening a peristaltic pump in the foaming agent conveying pipeline, pumping the surfactant solution, simultaneously starting a second air pump of the air conveying pipeline to output air, mixing the surfactant solution with the air through a tee joint, controlling the gas-liquid ratio of the air output by the second air pump and the pumped surfactant solution to generate micro-foam at the porous consolidation sand core, temporarily storing the micro-foam in a foam buffer container, then injecting a pollutant desorption device into a foam inlet, closing the peristaltic pump, the second air pump and the second valve after the whole elution reaction chamber is filled with the pollutant desorption device, opening the first valve, placing the desorption device in an ultrasonic vibration container, opening the ultrasonic vibration of the ultrasonic vibration container to desorb the organic matters in the polluted soil of the coking site, wherein the first valve is arranged on a waste liquid pipeline between the vacuum pump and the waste liquid outlet, and the second valve is arranged on a pipeline between the foam buffer container and the foam inlet;
(4) collecting waste gas and waste liquid: waste gas in the elution process enters a waste gas collecting bottle from a waste gas outlet and is adsorbed by activated carbon;
after the elution is finished, closing the ultrasonic vibration of the ultrasonic vibration container; and opening a vacuum pump, pumping out the waste liquid generated in the elution process through the vacuum pump, collecting the waste liquid by a waste liquid collecting bottle, and defoaming and pollutant treatment by adopting a waste liquid absorbent.
8. The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device according to claim 7, wherein: in the (2) ozone oxidation and soil boiling, the flow rate of ozone in the ozone conveying pipeline is 0.1-0.3L/min; the air flow in the air flow conveying pipeline is 90-120L/min; the implementation time of ozone oxidation and soil boiling is 2-5 min.
9. The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device according to claim 7, wherein: in the surfactant microfoam elution in the step (3), the gas-liquid ratio of air output by the second air pump to pumped surfactant solution is 3.3-20: 1; the ultrasonic vibration frequency of the ultrasonic vibration container is 40 KHz; and starting ultrasonic vibration of the ultrasonic vibration container, wherein the desorption time of the organic matters in the polluted soil in the coking field is 30-60 min.
10. The soil pollution desorption method using the boiling type micro-foam soil pollution desorption device according to claim 7, wherein: and (1) the tiling thickness of the coking field polluted soil in the polluted soil laying process is not more than 2/3 of the height of the airflow circulating baffle.
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| CN115121296B (en) * | 2022-07-05 | 2023-09-05 | 国家电投集团河南电力有限公司平东发电分公司 | Method for treating severe organic matter pollution of anion exchange resin |
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