CN111983094A - Method and system for testing and evaluating volatilization effect of foam barrier VOCs (volatile organic Compounds) - Google Patents
Method and system for testing and evaluating volatilization effect of foam barrier VOCs (volatile organic Compounds) Download PDFInfo
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Abstract
The invention relates to a method and a system for testing and evaluating volatilization effects of foam barrier VOCs, wherein the method comprises the following steps: 1) covering the foam layer on the surface of an organic solvent liquid beach or organic contaminated soil, and then putting the foam layer and the organic solvent liquid beach or organic contaminated soil surface into a VOCs release cabin; 2) controlling the temperature and humidity of the VOCs release cabin, and collecting gas samples in the VOCs release cabin through a gas sampling pump at intervals; 3) the collected gas sample enters a gas chromatograph for analysis to obtain the concentration c of the organic matters to be detected in the VOCs release cabin1(ii) a 4) Replacing the organic solvent liquid beach or the organic contaminated soil which is not covered by the foam layer into the VOCs release cabin, and repeating the step 2) and the step 3) to obtain the maximum value c of the concentration of the organic matters to be detected in the VOCs release cabin0And calculating to obtain the volatilization blocking rate of the foam to the organic matter to be detected. Compared with the prior art, the inventionThe method can be used for evaluating and verifying the blocking effect of the VOCs in the field of environmental remediation, and has the characteristics of simple and convenient operation, high accuracy of detected data and good repeatability.
Description
Technical Field
The invention belongs to the technical field of soil remediation, and relates to a method and a system for testing and evaluating volatilization effects of foam barrier VOCs.
Background
The soil remediation method can be classified into ex-situ remediation and in-situ remediation, but neither method can avoid excavation, turning and transportation of the polluted soil in the remediation process. In the process, the odor, peculiar smell and volatile organic pollutants which are generated by site disturbance and discharged in an unorganized mode can cause secondary pollution to the atmosphere, and the health of residents nearby a repair site and site repair operators is affected.
Scott Metcalf (Pollution Engineering,2005(2):12-15) reported 3 methods of inhibiting odor and VOCs contaminants in contaminated sites of gas plants: temporary storage collection, film covering and aqueous foam covering. Wherein, the buildings such as temporary storage and thin film greenhouses have the defects of high cost, incapability of moving, easy secondary pollution caused by the need of treating the collected tail gas and the like. The method for covering by the water-based foam has the advantages of convenience in use, long acting time, good effect, high economy, no delay in construction progress, no secondary pollution and the like, and the method is to spray the water-based foam on the polluted area of a gas plant and can effectively inhibit the release of stink and VOCs pollutants within 13-14 hours. At present, research on aqueous foams has been gradually conducted domestically.
US7659316B2 discloses a foam composition suitable for applications such as landfill covering, forest fire prevention, volatile gas emission control, and the like. The foam is composed of hydrolyzed protein, ferrous sulfate, cation modified starch and other components. The patent relates to the influence of different foam formulations on the viscosity of the foaming liquid, but does not mention specific application cases, effects and evaluation methods of the foam.
Chinese patent CN103484127A discloses a method for treating contaminated soil with foam, the foam components are: hydrolyzed protein, cation modified starch GPC X201, FeSO4Hexanediol, 4-chloro-2-benzylphenol, sodium lignosulfonate, the polysaccharide xanthan gum, polyacrylamide and water. Covering the surface layer of the polluted soil with foamed foam, adsorbing and eliminating pollutants in the soil by utilizing the surface adsorption capacity and the sterilization components of the foam, cleaning the foam for more than twenty hours, spraying the foam again, and circulating until the soil reaches the standard. The method only relates to the degradation effect of the foam on the polluted soil, and does not refer to the peculiar smell and the odor of the foam, the volatilization blocking function of VOCs and an evaluation method.
Zhongbing (Emergency rescue, 1996, 1: 45) covered toxic, harmful, flammable and explosive liquids with different foams to block their vapor diffusion, a method of measuring the change in weight per unit area of the liquid before and after foam covering to evaluate the foam inhibition. However, the liquid and the vapor have different volatilization amounts under different temperatures, pressures and humidities, and the accuracy and the repeatability of the method cannot be ensured only by measuring the weight of the liquid.
In general, the water-based foam can block the volatilization and diffusion of peculiar smell and VOCs pollutants, can be used for fire prevention and extinguishing, dust prevention, emergency rescue of chemical leakage and the like, and has very wide application prospect. However, although there are related studies in China at present, the evaluation method of the pollutant blocking effect of the foam is very few and is basically blank. The lack of the detection method is not beneficial to the control of enterprises on the quality of the foam products, and the government regulatory departments also lack the supervision basis. Therefore, it is necessary to develop a test and evaluation method for the odor barrier and the volatilization effect of VOCs.
Disclosure of Invention
The invention aims to provide a method and a system for testing and evaluating the volatilization effect of foam barrier VOCs, which can be used for evaluating and verifying the blocking effect of VOCs in the field of environmental remediation and have the characteristics of simple and convenient operation, high accuracy of detection data and good repeatability.
The purpose of the invention can be realized by the following technical scheme:
a testing and evaluating method for volatile effect of foam barrier VOCs comprises the following steps:
1) covering the foam layer on the surface of an organic solvent liquid beach or organic contaminated soil, and then putting the foam layer and the organic solvent liquid beach or organic contaminated soil surface into a VOCs release cabin;
2) controlling the temperature and humidity of the VOCs release cabin, and collecting gas samples in the VOCs release cabin through a gas sampling pump at intervals;
3) the collected gas sample enters a gas chromatograph for analysis to obtain the peak area of the organic matter to be detected, and the concentration c of the organic matter to be detected in the VOCs release cabin is obtained by utilizing the standard working curve of the organic matter to be detected1；
4) Cleaning the VOCs release cabin, replacing gas in the VOCs release cabin with air, then placing an organic solvent liquid beach or organic contaminated soil which is not covered by a foam layer into the VOCs release cabin, and repeating the step 2) and the step 3) to obtain the maximum value c of the concentration of the organic matters to be detected in the VOCs release cabin0From c1And c0And calculating to obtain the volatilization blocking rate of the foam to the organic matter to be detected.
Further, in the organic solvent pool or the organic contaminated soil, the organic matter to be detected comprises one or more of carbon tetrachloride, dichloromethane, chloroform, tetrachloroethylene, dibromoethylene, trichloroethylene, chloromethane, n-heptane, n-butane, n-pentane, n-hexane, toluene or xylene.
Further, in the step 2), the temperature of the VOCs in the releasing cabin is 20-60 ℃, and the humidity is 10% -60% R.H.
Further, in the step 2), the sampling time of the gas sampling pump is 1-60s, and the sampling interval is 1-30 min.
Further, in the step 3), the detector of the gas chromatograph is FID, ECD or TCD, the temperature of the detector is 50-300 ℃, and the temperature of the column oven is 50-300 ℃.
Further, in step 3), the standard working curve is drawn in the following process: preparing standard solutions of the organic matters to be detected with different concentrations, respectively introducing the solutions into a gas chromatograph for analysis, and drawing a standard working curve of the organic matters to be detected by taking the concentration of the organic matters to be detected as a horizontal coordinate and taking a peak area as a vertical coordinate.
Further, in the step 4), cleaning the VOCs release cabin by adopting ethanol; when air is replaced, the air flow rate is 0.4-10.0m/s, the air replacement rate is 0.2-2 times/h, and the air replacement time is 20-28 h.
Further, in the step 4), a calculation formula of the volatilization blocking rate of the foam to the organic matter to be detected is as follows: (c)0-c1)/c0X 100%, in mg/L.
Further, the foam comprises the following components in parts by weight: 10-20 parts of surfactant, 1-5 parts of inorganic salt, 1-5 parts of oxidant, 5-15 parts of starch, 1-5 parts of thickener, 1-5 parts of insoluble particulate matter and 55-81 parts of water; mixing the foam with water according to the mass ratio of 1 (0.5-20), and then stirring and foaming to form a foam layer.
Wherein the surfactant is a protein-based surfactant; the inorganic salt comprises one or more of sulfate, nitrate, borate or chlorine metal salt; the oxidant comprises one or more of a peroxide, a persulfate, or a permanganate; the thickener comprises one or more of xanthan gum, carrageenan, pectin or cellulose; the insoluble particulate matter comprises one or more of quartz sand, bentonite, zeolite powder, activated carbon or molecular sieve, and has a particle size of 50-500 meshes.
A system for implementing the testing and evaluating method for the volatilization effect of the foam barrier VOCs comprises a VOCs release cabin, a gas sampling pump and a gas chromatograph which are sequentially communicated. The system also comprises an air compressor, a mass flow controller, a six-way valve and other components.
Compared with the prior art, the invention has the following characteristics:
1) the invention provides a method and a system for testing and evaluating the volatilization effect of foam barrier VOCs, which can effectively fill the technical blank in the technical field;
2) compared with the similar test evaluation method, the method provided by the invention has the advantages of accurate and controllable test environment temperature and humidity, good data repeatability, high accuracy, simple and convenient operation and the like.
Drawings
FIG. 1 is a schematic structural diagram of a test evaluation system in an embodiment;
the notation in the figure is:
1-air compressor, 2-relief pressure valve, 3-mass flow controller, 4-VOCs release cabin, 5-gas sampling pump, 6-gas drier, 7-six-way valve, 8-gas chromatograph, 9-computer workstation.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the following embodiments, as shown in fig. 1, the test evaluation system includes an air compressor 1, a pressure reducing valve 2, a mass flow controller 3, a VOCs release chamber 4, a gas sampling pump 5, a gas dryer 6, a six-way valve 7, a gas chromatograph 8, and a computer workstation 9, which are connected in series in this order. Wherein the pressure reducing valve 2 and the mass flow controller 3 are used for controlling the air flow and the water flow entering the VOCs releasing cabin 4; the VOCs release cabin 4 is used for controlling the temperature, the humidity and the air circulation frequency of the experiment; the gas sampling pump 5 is used for collecting gas samples in the VOCs release cabin 4 and controlling the sample collection flow and the collection time; the gas dryer 6 is used for drying and purifying the collected sample to prevent the sample from polluting the gas chromatograph 8; the six-way valve 7 controls the volume of the gas sample entering the gas chromatograph 8; the gas chromatograph 8 performs qualitative and quantitative analysis on the sample; the data processing work is finally completed on the computer workstation 9.
In the experimental process, firstly, the temperature, the humidity and the air circulation frequency of the VOCs release cabin 4 are set, after the equipment reaches a stable state, a sample to be tested is put into the VOCs release cabin 4, after the equipment reaches the stable state again, the gas sample in the VOCs release cabin 4 is collected through the gas sampling pump 5 according to a certain time interval, the gas sample is dried and purified and then is injected through the six-way valve 7 of the gas chromatograph 8, and the test process is completed after the gas sample is analyzed through the gas chromatograph 8. The test evaluation system ensures accurate and repeatable control of the temperature and humidity of the test environment, avoids the influence of impurity components in the ambient air on the test result, and can qualitatively and quantitatively analyze the volatilization blocking effect of the foam barrier material on VOCs pollutants by combining the gas chromatograph 8.
Example 1:
the embodiment is used for analyzing and evaluating the volatile concentration of volatile organic solvents and toxic and harmful steam under certain atmospheric conditions.
The embodiment comprises the following steps when in application:
step (1): 50g of n-hexane is filled into a glass beaker, and then the glass beaker is placed into a VOCs release cabin;
step (2): and adjusting the temperature of the VOCs release cabin to 30 ℃, the humidity to 40% R.H., the air flow rate to be 1.0m/s and the air replacement rate to be 1.1 times/h.
And (3): setting the sampling time of the gas sampling pump to be 5s, and setting the sampling interval to be 4 min;
and (4): the temperature of the gas chromatograph FID detector was set to 200 ℃ and the column oven temperature was set to 115 ℃.
And (5): and (4) converting the concentration of the n-hexane in the VOCs release cabin according to the peak area of the n-hexane displayed on the gas chromatogram and the standard curve of the n-hexane. The concentration of n-hexane in the release cabin of VOCs at different times is shown in Table 1.
TABLE 1 concentration of n-hexane in VOCs Release Chamber at different times
Example 2:
the embodiment is used for evaluating the volatilization effect of the foam for blocking toxic and harmful steam, volatile pollutants and organic solvent liquid pools. The foam material comprises the following components in percentage by mass: 12% of protein-based surfactant, 1% of ferrous sulfate, 1% of sodium persulfate, 8% of starch, 1% of cellulose, 1% of quartz sand and 76% of deionized water.
The embodiment comprises the following steps when in application:
step (1): 50g of n-hexane was charged into a glass beaker;
step (2): mixing the components of the foam material and ionized water according to the mass ratio of 1: and 3, diluting, uniformly stirring, covering 15g of foam on the surface liquid level of the n-hexane surface layer, and then putting the n-hexane beaker covered with the foam into a VOCs release cabin.
And (3): and adjusting the temperature of the VOCs release cabin to 30 ℃, the humidity to 40% R.H., the air flow rate to be 1.0m/s and the air replacement rate to be 1.1 times/h.
And (4): the sampling time of the gas sampling pump is set to 5s, and the sampling interval is set to 4 min.
And (5): the temperature of the gas chromatograph FID detector was set to 200 ℃ and the column oven temperature was set to 115 ℃.
And (6): and (4) converting the concentration of the n-hexane in the VOCs release cabin according to the peak area of the n-hexane displayed on the gas chromatogram and the standard curve of the n-hexane. According to the formula: (c)0-c1)/c0X 100%, calculating the volatilization blocking rate of the foam to the normal hexane. According to example 1, c0The content of the polymer was 80.7ppm, and the volatilization blocking rate of n-hexane at different foam timings is shown in Table 2.
TABLE 2 blocking rate of foam to n-hexane volatilization at different times
From the above table it can be seen that: the foam covers n-hexane for 360min, the volatilization blocking rate of the n-hexane is 99.5%, and the volatilization of the n-hexane is effectively inhibited.
Example 3:
the embodiment is used for analyzing and evaluating the volatile concentration of volatile organic solvents and toxic and harmful steam under certain atmospheric conditions.
The embodiment comprises the following steps when in application:
step (1): 20g of toluene is filled in a glass beaker, and then the glass beaker is placed in a VOCs release cabin;
step (2): and adjusting the temperature of the VOCs release cabin to 40 ℃, the humidity to 40% R.H., the air flow rate to be 2.0m/s and the air replacement rate to be 1 time/h.
And (3): setting the sampling time of a gas sampling pump to be 2s and setting the sampling interval to be 5 min;
and (4): the temperature of the gas chromatograph FID detector was set to 180 ℃ and the column oven temperature was set to 100 ℃.
And (5): and converting the concentration of the toluene in the VOCs release cabin according to the peak area of the toluene displayed on the gas chromatogram and a standard curve of the toluene. The concentration of toluene in the release vessel for VOCs at different times is shown in table 3.
TABLE 3 concentration of toluene in VOCs Release Chamber at different times
Example 4:
the embodiment is used for evaluating the volatilization effect of the foam for blocking toxic and harmful steam, volatile pollutants and organic solvent liquid pools. The foam material comprises the following components in percentage by mass: 14% of protein-based surfactant, 2% of sodium chloride, 1% of sodium persulfate, 10% of starch, 2% of pectin, 1.5% of bentonite and 69.5% of deionized water.
The embodiment comprises the following steps when in application:
step (1): a glass beaker was charged with 20g of toluene;
step (2): mixing the components of the foam material and ionized water according to the mass ratio of 1: and 5, diluting, uniformly stirring, covering 20g of foam on the surface liquid level of the toluene, and then putting the toluene beaker covered with the foam into a VOCs release cabin.
And (3): and adjusting the temperature of the VOCs release cabin to 40 ℃, the humidity to 40% R.H., the air flow rate to be 2.0m/s and the air replacement rate to be 1 time/h.
And (4): the sampling time of the gas sampling pump is set to be 2s, and the sampling interval is set to be 5 min.
And (5): the temperature of the gas chromatograph FID detector was set to 180 ℃ and the column oven temperature was set to 100 ℃.
And (6): and converting the concentration of the toluene in the VOCs release cabin according to the peak area of the toluene displayed on the gas chromatogram and a standard curve of the toluene. According to the formula: (c)0-c1)/c0X 100%, calculating the volatilization blocking rate of the foam to toluene. According to example 3, c065.7ppm, and the blocking rate of toluene volatilization at different foam times is shown in Table 4.
TABLE 4 blocking rate of toluene volatilization at different foam times
From the above table it can be seen that: the volatilization blocking rate of the toluene after the foam covers the toluene for 360min is 98.5 percent, and the volatilization of the toluene is effectively inhibited.
Example 5:
the embodiment is used for analyzing and evaluating the volatile concentration of volatile organic solvents and toxic and harmful steam under certain atmospheric conditions.
The embodiment comprises the following steps when in application:
step (1): putting 70g of tetrachloroethylene into a glass beaker, and then putting the glass beaker into a VOCs release cabin;
step (2): and adjusting the temperature of the VOCs release cabin to 40 ℃, the humidity to 30% R.H., the air flow rate to be 5.0m/s and the air replacement rate to be 1.5 times/h.
And (3): setting the sampling time of a gas sampling pump as 2s and setting the sampling interval as 10 min;
and (4): the temperature of the gas chromatograph FID detector was set to 200 ℃ and the column oven temperature was set to 80 ℃.
And (5): and (4) converting the concentration of the tetrachloroethylene in the VOCs release cabin according to the peak area of the tetrachloroethylene displayed on a gas chromatograph and a standard curve of the tetrachloroethylene. The concentration of tetrachloroethylene in the release capsule of VOCs at different times is shown in Table 5.
TABLE 5 concentration of tetrachloroethylene in VOCs Release Chamber at different times
Example 6:
the embodiment is used for evaluating the volatilization effect of the foam for blocking toxic and harmful steam, volatile pollutants and liquid pools. The foam material comprises the following components in percentage by mass: 11% of protein-based surfactant, 1.5% of ferrous sulfate, 1% of sodium percarbonate, 8% of starch, 1.5% of xanthan gum, 1.5% of bentonite and 75.5% of deionized water.
The embodiment comprises the following steps when in application:
step (1): a glass beaker was charged with 70g of tetrachloroethylene;
step (2): mixing the components of the foam material and ionized water according to the mass ratio of 1: 3, diluting, uniformly stirring, covering 30g of foam on the liquid surface of the tetrachloroethylene surface layer, and then putting the tetrachloroethylene beaker covered with the foam into a VOCs release cabin.
And (3): and adjusting the temperature of the VOCs release cabin to 40 ℃, the humidity to 30% R.H., the air flow rate to be 5.0m/s and the air replacement rate to be 1.5 times/h.
And (4): the sampling time of the gas sampling pump is set to be 2s, and the sampling interval is set to be 10 min.
And (5): the temperature of the gas chromatograph FID detector was set to 200 ℃ and the column oven temperature was set to 80 ℃.
And (6): converting the concentration of tetrachloroethylene in the VOCs release chamber according to the peak area of tetrachloroethylene displayed on a gas chromatograph and a standard curve of tetrachloroethylene. According to the formula: (c)0-c1)/c0X 100%, calculating the volatilization blocking rate of the foam to the tetrachloroethylene. According to example 5, c089.1ppm, and the blocking rate of volatilization of tetrachloroethylene at different points in the foam is shown in Table 6.
TABLE 6 blocking rate of foam to volatilization of tetrachloroethylene at different times
From the above table it can be seen that: the blocking rate of the foam covering the tetrachloroethylene to the volatilization of the tetrachloroethylene after 360min is 88.9 percent, and the volatilization of the tetrachloroethylene is effectively inhibited.
In the above embodiments, the organic substance to be detected may be replaced by one or more of carbon tetrachloride, dichloromethane, chloroform, tetrachloroethylene, dibromoethylene, trichloroethylene, chloromethane, n-heptane, n-butane, n-pentane, n-hexane, toluene, or xylene.
The VOCs are released into the cabin, the temperature can be replaced by 20 ℃, 45 ℃ or 60 ℃, and the humidity can be replaced by 10% R.H., 40% R.H. or 60% R.H.
The sampling time of the gas sampling pump can be replaced by 1s, 20s, 50s or 60s, and the sampling interval can be replaced by 1min, 15min or 30 min.
The detector of the gas chromatograph can be replaced by FID, ECD or TCD, the temperature of the detector can be replaced by 50 ℃, 150 ℃ or 300 ℃, and the temperature of the column oven can be replaced by 50 ℃, 150 ℃ or 300 ℃.
The air flow rate can be replaced by 0.4m/s, 5m/s or 10.0m/s, the air replacement rate can be replaced by 0.2 times/h, 1 time/h or 2 times/h, and the air replacement time can be replaced by 20h, 24h or 28 h.
The foam comprises the following components in parts by weight: 10-20 parts (for example, 12 parts or 18 parts) of a surfactant, 1-5 parts (for example, 2 parts or 4 parts) of an inorganic salt, 1-5 parts (for example, 2 parts or 4 parts) of an oxidizing agent, 5-15 parts (for example, 8 parts or 12 parts) of starch, 1-5 parts (for example, 2 parts or 4 parts) of a thickener, 1-5 parts (for example, 2 parts or 4 parts) of insoluble particulate matter, and 55-81 parts (for example, 60 parts or 75 parts) of water; mixing the foam with water according to the mass ratio of 1 (0.5-20), and then stirring and foaming to form a foam layer.
The embodiments described above are described to facilitate an understanding and appreciation of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make modifications and alterations without departing from the scope of the present invention.
Claims (10)
1. A testing and evaluating method for volatile effects of foam barrier VOCs is characterized by comprising the following steps:
1) covering the foam layer on the surface of an organic solvent liquid beach or organic contaminated soil, and then putting the foam layer and the organic solvent liquid beach or organic contaminated soil surface into a VOCs release cabin;
2) controlling the temperature and humidity of the VOCs release cabin, and collecting gas samples in the VOCs release cabin through a gas sampling pump at intervals;
3) the collected gas sample enters a gas chromatograph for analysis to obtain the peak area of the organic matter to be detected, and the concentration c of the organic matter to be detected in the VOCs release cabin is obtained by utilizing the standard working curve of the organic matter to be detected1；
4) Cleaning the VOCs release cabin, replacing gas in the VOCs release cabin with air, then placing an organic solvent liquid beach or organic contaminated soil which is not covered by a foam layer into the VOCs release cabin, and repeating the step 2) and the step 3) to obtain the maximum value c of the concentration of the organic matters to be detected in the VOCs release cabin0From c1And c0And calculating to obtain the volatilization blocking rate of the foam to the organic matter to be detected.
2. The method of claim 1, wherein the organic substances to be tested in the organic solvent pool or the organic contaminated soil include one or more of carbon tetrachloride, dichloromethane, chloroform, tetrachloroethylene, dibromoethylene, trichloroethylene, chloromethane, n-heptane, n-butane, n-pentane, n-hexane, toluene, or xylene.
3. The method for testing and evaluating the volatilization effect of the foam-barrier VOCs according to claim 1, wherein in the step 2), the temperature in the VOCs release cabin is 20-60 ℃, and the humidity is 10% -60% R.H.
4. The method according to claim 1, wherein in step 2), the sampling time of the gas sampling pump is 1-60s, and the sampling interval is 1-30 min.
5. The method according to claim 1, wherein in step 3), the detector of the gas chromatograph is FID, ECD or TCD, the temperature of the detector is 50-300 ℃, and the temperature of the column oven is 50-300 ℃.
6. The method for testing and evaluating the volatilization effects of the foam-barrier VOCs according to claim 1, wherein in the step 3), the standard working curve is drawn by the following process: preparing standard solutions of the organic matters to be detected with different concentrations, respectively introducing the solutions into a gas chromatograph for analysis, and drawing a standard working curve of the organic matters to be detected by taking the concentration of the organic matters to be detected as a horizontal coordinate and taking a peak area as a vertical coordinate.
7. The method for testing and evaluating the volatilization effect of the foam-blocking VOCs according to claim 1, wherein in the step 4), the VOCs release cabin is cleaned by ethanol; when air is replaced, the air flow rate is 0.4-10.0m/s, the air replacement rate is 0.2-2 times/h, and the air replacement time is 20-28 h.
8. The method for testing and evaluating the volatilization effect of the foam-blocking VOCs according to claim 1, wherein in the step 4), the volatilization blocking rate of the foam to the organic matter to be tested is calculated according to the following formula: (c)0-c1)/c0×100％。
9. The method for testing and evaluating the volatilization effect of the foam-blocking VOCs according to claim 1, wherein the foam comprises the following components in parts by weight: 10-20 parts of surfactant, 1-5 parts of inorganic salt, 1-5 parts of oxidant, 5-15 parts of starch, 1-5 parts of thickener, 1-5 parts of insoluble particulate matter and 55-81 parts of water; mixing the foam with water according to the mass ratio of 1 (0.5-20), and then stirring and foaming to form a foam layer.
10. A system for implementing the method for testing and evaluating the volatilization effect of the foam-blocking VOCs according to any one of claims 1 to 9, wherein the system comprises a VOCs release chamber, a gas sampling pump and a gas chromatograph which are communicated in sequence.
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| CN115479880A (en) * | 2022-10-17 | 2022-12-16 | 大连理工大学 | Method for measuring permeability coefficient of high-density polyethylene film in process of blocking volatile organic compounds |
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| CN115479880A (en) * | 2022-10-17 | 2022-12-16 | 大连理工大学 | Method for measuring permeability coefficient of high-density polyethylene film in process of blocking volatile organic compounds |
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