CN115739950A - Spraying-instant-control and multiple-resistance-control green degradable foam base liquid and application thereof in treatment of odor of polluted soil - Google Patents
Spraying-instant-control and multiple-resistance-control green degradable foam base liquid and application thereof in treatment of odor of polluted soil Download PDFInfo
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- CN115739950A CN115739950A CN202211466409.3A CN202211466409A CN115739950A CN 115739950 A CN115739950 A CN 115739950A CN 202211466409 A CN202211466409 A CN 202211466409A CN 115739950 A CN115739950 A CN 115739950A
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Images
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- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
Abstract
The invention belongs to the technical field of treatment and control of malodorous smell in polluted sites, and particularly relates to an immediate-spraying immediate-control and multiple-resistance-control green degradable foam base liquid and application thereof in treatment of malodorous smell in polluted soil. The invention provides an immediate spraying and immediate control and multiple resistance control green degradable foam base fluid, which comprises: 6 to 10 portions of vegetable protein, 1.5 to 2 portions of peculiar smell absorbent, 2 to 4 portions of first surfactant, 0.2 to 0.4 portion of first stabilizer and 83.6 to 92.3 portions of water. According to the invention, the plant protein and the peculiar smell absorbent are compounded, and the first surfactant and the first stabilizer are compounded to form the green degradable foam which can be sprayed and controlled immediately and can be subjected to multiple resistance control, so that the problems of single existing stinky smell dissipation control method and inflexible use scene are solved, and the purpose of multiple resistance control of the stinky smell can be realized. After the composite material is sprayed, the odor released by the polluted soil can be inhibited, the foam stabilizing time is longer than 48h, and the foam components are green and degradable, so that secondary pollution is avoided.
Description
Technical Field
The invention belongs to the technical field of treatment and control of malodorous smell in polluted sites, and particularly relates to an immediate-spraying immediate-control and multiple-resistance-control green degradable foam base liquid and application thereof in treatment of malodorous smell in polluted soil.
Background
With the development of the polluted site repairing work, a series of environmental safety problems are exposed, wherein the problem of odor dissipation in the site repairing process is particularly prominent.
In the contaminated site soil remediation process, the problem of odor dissipation is generally solved by building an inflatable greenhouse and the like to physically control the dissipated odor. Although the technology can temporarily relieve the problem of odor dissipation in soil remediation, the problem of inflexible use scenes is still faced in the actual use process.
Disclosure of Invention
The invention aims to provide an instant-spraying instant-control and multiple-resistance-control green degradable foam base liquid and application thereof in treatment of malodorous smell of polluted soil.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides an immediate-spraying immediate-control and multiple-resistance-control green degradable foam base fluid which comprises the following components in parts by weight:
6 to 10 portions of vegetable protein, 1.5 to 2 portions of peculiar smell absorbent, 2 to 4 portions of first surfactant, 0.2 to 0.4 portion of first stabilizer and 83.6 to 92.3 portions of water;
the peculiar smell absorbent is prepared from the following components in percentage by mass: 39.3 to 45.4 weight percent of clay, 22.5 to 25 weight percent of urea, 31.5 to 35 weight percent of hydrogen peroxide, 0.3 to 0.5 weight percent of second stabilizer and 0.2 to 0.3 weight percent of second surfactant.
Preferably, the raw material for preparing the vegetable protein comprises one or more of waste rice bran, soybean meal and soybeans.
Preferably, the preparation method of the vegetable protein comprises the following steps:
soaking the preparation raw material of the plant protein in an aqueous solution of inorganic strong base for leaching, and performing solid-liquid separation to obtain an alkaline solution of the plant protein, wherein the liquid-solid ratio during leaching is (10-20): 1; and neutralizing the alkaline solution of the plant protein to be neutral to obtain the aqueous solution of the plant protein.
Preferably, the leaching temperature is 20-30 ℃; the heat preservation time of the leaching is 0.5 to 12 hours; the molar concentration of the aqueous solution of the inorganic strong base is 0.6-1 mol/L; the grain size of the raw materials for preparing the vegetable protein is less than or equal to 0.18mm.
Preferably, the particle size of the odor absorbent is 5-20 μm; the clay in the peculiar smell absorbent comprises one or more of bentonite, attapulgite and kaolin. .
Preferably, the first surfactant is a nonionic surfactant.
Preferably, the first stabilizer is one or more of xanthan gum, gum arabic, guar gum, gelatin and carrageenan.
The invention provides application of the instant-spraying instant-control and multiple-resistance-control green degradable foam base solution in the technical scheme in treating the odor in the polluted soil.
Preferably, the odor generating substances in the polluted soil comprise one or more of benzene series substances, halogenated hydrocarbons and thioether substances; the content of the malodorous substances in the polluted soil is 1g/kg.
Preferably, the application comprises the following steps:
spraying the instant-spraying instant-control and multiple-resistance-control green degradable foam base solution on the surface of the polluted soil after foaming;
during foaming, the volume ratio of the immediate-spraying immediate-control and multiple-resistance-control green degradable foam base liquid to air is 1 (5-15);
when the green degradable foam is sprayed, the spraying thickness of the formed instant spraying instant control and multiple resistance control green degradable foam is 10-30 cm.
The invention provides an immediate-spraying immediate-control and multiple-resistance-control green degradable foam base fluid which comprises the following components in parts by weight: 6 to 10 portions of vegetable protein, 1.5 to 2 portions of peculiar smell absorbent, 2 to 4 portions of first surfactant, 0.2 to 0.4 portion of first stabilizer and 83.6 to 92.3 portions of water; the peculiar smell absorbent is prepared from the following components in percentage by mass: 39.3 to 45.4 weight percent of clay, 22.5 to 25 weight percent of urea, 31.5 to 35 weight percent of hydrogen peroxide, 0.3 to 0.5 weight percent of second stabilizer and 0.2 to 0.3 weight percent of second surfactant. In the invention, protein matrix foam generated by foaming vegetable protein is used as the first physical resistance control; the adsorption effect of the organic bentonite in the peculiar smell absorbent is the second adsorption resistance control; the third degradation prevention and control is that the hydrogen peroxide in the odor absorbent can slowly release active oxygen to degrade the substances of the odor; the invention can realize the purposes of spraying and controlling as well as long-acting resistance control by the superposition of triple resistance control means. The scheme provided by the invention solves the problems of single existing malodorous smell dissipation control method and inflexible use scene, and can realize the purpose of multiple control of malodorous smell. Meanwhile, the spray-to-control and multiple-resistance-control green degradable foam base solution provided by the invention is compounded with the vegetable protein and the peculiar smell absorbent through the first surfactant and the first stabilizer, so that the viscoelasticity of the foam is enhanced, the stability time of the foam is greatly prolonged and is more than 48h, and the practical application requirement of long-acting resistance control of the odor is met.
The immediate spraying and immediate control and multiple resistance control green degradable foam base liquid provided by the invention can be widely applied to control of peculiar smell substances in various polluted sites, and comprises the following steps: the method has the advantages that the odor substances are prevented from being volatilized acutely in the excavation process of the polluted site, the safety of construction personnel is guaranteed, and the quality of the surrounding air environment is improved; the covering soil is replaced in the refuse landfill, so that the diffusion of peculiar smell substances can be effectively prevented, and manpower and material resources required by the covering soil can be saved. The scheme provided by the invention is used for treating the odor pollution source exposed in the air, so that the diffusion of odor substances to the atmosphere can be effectively prevented, and the effective time is more than 48h.
Further, the preparation raw material of the vegetable protein comprises one or more of waste rice bran, waste soybean meal and waste soybeans. The green degradable foam base fluid which is controlled immediately by spraying and multiple resistance control has low cost and is suitable for large-scale application.
Drawings
Fig. 1 is a schematic flow chart of preparation and application of an instant-spraying instant-control and multiple-resistance-control green degradable foam base fluid provided by an embodiment of the invention.
Detailed Description
The invention provides an immediate-spraying immediate-control and multiple-resistance-control green degradable foam base fluid which comprises the following components in parts by weight:
6 to 10 portions of vegetable protein, 1.5 to 2 portions of peculiar smell absorbent, 2 to 4 portions of first surfactant, 0.2 to 0.4 portion of first stabilizer and 83.6 to 92.3 portions of water;
the peculiar smell absorbent is prepared from the following components in percentage by mass: 39.3 to 45.4 weight percent of clay, 22.5 to 25 weight percent of urea, 31.5 to 35 weight percent of hydrogen peroxide, 0.3 to 0.5 weight percent of second stabilizer and 0.2 to 0.3 weight percent of second surface activity.
In the present invention, all the preparation starting materials/components are commercially available products well known to those skilled in the art unless otherwise specified.
The instant-spraying instant-control and multiple-resistance-control green degradable foam base solution provided by the invention comprises 6-10 parts by mass of vegetable protein, preferably 6-8 parts by mass, and particularly preferably 6 or 8 parts by mass.
In the present invention, the raw material for preparing the vegetable protein preferably includes one or more of waste rice bran, soybean meal and soybeans.
In the present invention, the preparation method of the plant protein preferably comprises the steps of:
soaking the preparation raw material of the plant protein in an aqueous solution of inorganic strong base for leaching, and performing solid-liquid separation to obtain an alkaline solution of the plant protein, wherein the liquid-solid ratio during leaching is (10-20): 1; and neutralizing the alkaline solution of the plant protein to be neutral to obtain the aqueous solution of the plant protein.
In the present invention, the particle size of the raw material for producing the vegetable protein is preferably 0.18mm or less, more preferably 0.125mm or less.
In the present invention, the present invention preferably crushes the raw material for the production of the plant protein before the leaching. The invention has no special requirements on the specific implementation process of the crushing, and the preparation raw material of the vegetable protein is crushed until the particle size range is preferably less than or equal to 0.18mm.
In the present invention, the strong inorganic base preferably includes sodium hydroxide and/or potassium hydroxide.
In the present invention, the molar concentration of the aqueous solution of the inorganic strong base is preferably 0.6 to 1mol/L, and more preferably 1mol/L.
In the present invention, the liquid-solid ratio at the time of leaching is preferably 15.
In the present invention, the temperature of the leaching is preferably 20 to 30 ℃, more preferably 25 ℃.
In the present invention, the soaking time for the leaching is preferably 0.5 to 12 hours, and more preferably 12 hours.
In the invention, the leaching is directly carried out to obtain leaching materials, and the invention preferably carries out solid-liquid separation on the leaching materials to obtain alkaline solution of the vegetable protein. In the present invention, the solid-liquid separation is particularly preferably filtration.
After the alkaline solution of the plant protein is obtained, the alkaline solution of the plant protein is neutralized to be neutral, and the aqueous solution of the plant protein is obtained.
The invention preferably takes the plant protein aqueous solution with neutral pH value as the plant protein component and the water component of the spraying-instant-control and multiple-resistance-control green degradable foam base solution directly, and when the water in the plant protein aqueous solution is different from the water in the spraying-instant-control and multiple-resistance-control green degradable foam base solution in parts by mass, the invention preferably removes part of the water in the plant protein aqueous solution or supplements part of the water in the plant protein aqueous solution.
Based on the mass parts of the vegetable protein, the instant-spraying instant-control and multiple-resistance-control green degradable foam base liquid provided by the invention comprises 1.5-2 parts of an odor absorbent, preferably 1.5-1.8 parts, and particularly preferably 1.5 parts or 1.8 parts.
In the present invention, the particle size of the odor absorbent is preferably 5 to 20 μm, and more preferably 5.5 to 18 μm.
In the invention, the peculiar smell absorbent is prepared from the following components in percentage by mass: 39.3 to 45.4 weight percent of clay, 22.5 to 25 weight percent of urea, 31.5 to 35 weight percent of hydrogen peroxide, 0.3 to 0.5 weight percent of second stabilizer and 0.2 to 0.3 weight percent of second surface activity.
In the present invention, the odor absorbent is preferably prepared from the following components by weight percent: 39.3wt% of clay, 25wt% of urea, 35wt% of hydrogen peroxide, 0.5wt% of a second stabilizer, 0.2wt% of a second surfactant.
In the invention, the peculiar smell absorbent is preferably prepared from the following components in percentage by mass: 45.4wt% of clay, 22.5wt% of urea, 31.5wt% of hydrogen peroxide, 0.3wt% of a second stabilizer, 0.3wt% of a second surfactant.
In the present invention, the clay in the odor absorbent preferably comprises one or more of bentonite, attapulgite and kaolin.
In the invention, the bentonite is preferably organic modified bentonite of which quaternary ammonium salt, and the content of montmorillonite in the bentonite is preferably more than 90wt%.
In the present invention, the second stabilizer preferably includes one or more of tartaric acid, salicylic acid, citric acid, ethylenediaminetetraacetic acid, and sodium phosphate.
In the present invention, the second surfactant preferably includes one or more of dodecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide, octadecyl trimethyl ammonium bromide, and chitosan.
In the present invention, the content of montmorillonite in the organic bentonite is preferably > 90wt%, and the organic bentonite is preferably a quaternary ammonium salt organically modified bentonite.
In the invention, the hydrogen peroxide is added in the form of a hydrogen peroxide solution, the mass fraction of the hydrogen peroxide solution is 30%, and the dosage of the hydrogen peroxide solution is not particularly limited, so that the content of the hydrogen peroxide in the odor absorbent can be ensured to be 31.5-35 wt%.
The invention also provides a preparation method of the peculiar smell absorbent, which comprises the following steps:
mixing urea, a second stabilizer and a hydrogen peroxide solution, and recrystallizing to obtain a urea peroxide solution;
mixing clay, a second surfactant and an organic solvent to obtain gel;
and mixing the urea peroxide solution and the gel, and drying to obtain the peculiar smell absorbent.
The urea peroxide solution is obtained by mixing urea, a second stabilizing agent and a hydrogen peroxide solution and recrystallizing.
In the present invention, the mixing is preferably performed at 30 ℃ with stirring, and the rotation speed of the stirring is preferably 500 to 600r/min.
In the embodiment of the present invention, it is preferable to add urea to the hydrogen peroxide solution, add the stabilizer, heat to 30 ℃, and magnetically stir until it is dissolved.
In the present invention, the temperature of the recrystallization is preferably room temperature, and no additional heating or cooling is required.
The invention mixes the clay, the second surfactant and the organic solvent to obtain the gel.
In the present invention, the organic solvent is preferably methanol or ethanol. The amount of the organic solvent used in the present invention is not particularly limited, and a gel can be obtained.
In the present invention, the mixing is preferably performed at 30 ℃ with stirring, and the rotation speed of the stirring is preferably 200 to 300r/min.
After the urea peroxide solution and the gel are obtained, the urea peroxide solution and the gel are mixed and dried to obtain the peculiar smell absorbent.
According to the invention, the urea peroxide solution is preferably added into the gel for impregnation, and then ice bath and suction filtration are sequentially carried out. In the present invention, the temperature of the impregnation is preferably 30 ℃ and the time is preferably 4 hours.
The present invention is not limited to specific parameters of the ice bath and the suction filtration.
After the suction filtration is finished, the obtained solid product is preferably dried and ball-milled in sequence to obtain the peculiar smell absorbent.
In the present invention, the drying temperature is preferably 50 ℃ and the drying time is preferably 24 hours, and the drying is preferably performed in an oven.
In the present invention, the ball milling is preferably carried out until the resulting material is sieved through a 400 mesh sieve, and the ball milling is preferably carried out in a ball mill.
The instant-spraying instant-control and multiple-resistance-control green degradable foam base solution provided by the invention comprises 2-4 parts of first surfactant, preferably 2-3 parts, and particularly preferably 2 or 3 parts by mass of plant protein.
In the present invention, the first surfactant is preferably a nonionic surfactant, and more preferably one or more of dodecyl glycoside, sodium dodecylbenzenesulfonate, hydroxypropylmethylcellulose, sodium dodecylsulfate and sodium fatty acid methyl ester sulfonate.
The green degradable foam base solution capable of controlling spraying and multiple resistances comprises 0.2-0.4 parts of first stabilizer, preferably 0.2-0.3 part, and particularly preferably 0.2 part or 0.3 part by mass of plant protein.
In the present invention, the first stabilizer is preferably one or more of xanthan gum, gum arabic, guar gum, gelatin and carrageenan.
The instant-spraying instant-control and multiple-resistance-control green degradable foam base solution provided by the invention comprises 83.6-92.3 parts of water, preferably 84-92 parts of water in parts by weight.
In the present invention, the plant protein and water are preferably added as an aqueous solution of the plant protein according to the above-mentioned embodiment. When the water in the aqueous solution of the plant protein is different from the water in the immediate spraying, immediate control and multiple resistance control green degradable foam base liquid in parts by mass, the invention preferably removes part of the water in the aqueous solution of the plant protein or supplements part of the water in the aqueous solution of the plant protein.
The invention provides a preparation method of immediate-spraying immediate-control and multiple-resistance-control green degradable foam base fluid, which preferably comprises the following steps:
mixing the vegetable protein, the peculiar smell absorbent, the first surfactant, the first stabilizer and water to obtain the spraying-while-spraying and multiple-resistance-control green degradable foam base liquid.
In the present invention, the plant protein and water are preferably added as an aqueous solution of the plant protein according to the above-mentioned embodiment. When the water in the aqueous solution of the plant protein is different from the water in the immediate spraying, immediate control and multiple resistance control green degradable foam base liquid in parts by mass, the invention preferably removes part of the water in the aqueous solution of the plant protein or supplements part of the water in the aqueous solution of the plant protein.
The invention provides application of the instant-spraying instant-control and multiple-resistance-control green degradable foam base solution in the technical scheme in treating the odor in the polluted soil.
In the present invention, the malodor smell-generating substance in the contaminated soil preferably includes one or more of benzene series, halogenated hydrocarbon and thioether series.
In the present invention, the content of the malodorous substance in the contaminated soil is preferably 1g/kg.
In the present invention, the application preferably comprises the steps of:
the green degradable foam base liquid which is instantly sprayed and controlled and is multiply blocked and controlled according to the technical scheme is sprayed on the surface of the polluted soil after being foamed,
during foaming, the volume ratio of the immediate-spraying immediate-control and multiple-resistance-control green degradable foam base liquid to air is 1 (5-15), and preferably 1 (5-10).
When the green degradable foam is sprayed, the spraying thickness of the formed instant spraying instant control and multiple resistance control green degradable foam is 10-30 cm, and preferably 10-25 cm.
In the present invention, the foaming is preferably carried out in a foam spray device.
In the invention, the green degradable foam base liquid which is sprayed and controlled immediately and controlled by multiple resistance is foamed by gas-liquid mixing and pore impact.
The invention provides an immediate-spraying immediate-control and multiple-resistance-control green degradable foam base fluid. In the invention, protein matrix foam generated by plant protein foaming obtained by extracting waste plants is used as a first physical resistance control, the adsorption effect of organic bentonite in the peculiar smell absorbent is a second physical resistance control, and hydrogen peroxide in the peculiar smell absorbent slowly releases active oxygen to degrade foul smell to be a third physical resistance control; the main raw materials of the spraying-instant-control and multiple-resistance-control green degradable foam base solution provided by the invention are plant protein and an odor absorbent extracted from waste plants, and are compounded with a first surfactant and a first stabilizer to form spraying-instant-control and multiple-resistance-control green degradable foam, so that the odor released by polluted soil can be inhibited after spraying, the foam stabilizing time is more than 48 hours, the foam components are green and degradable, and no secondary pollution is generated.
In order to further illustrate the present invention, the following detailed description of the technical solutions provided by the present invention is made with reference to the accompanying drawings and examples, but they should not be construed as limiting the scope of the present invention.
Example 1
According to a schematic diagram of a preparation process and an application flow of the spraying-while-spraying-controlling and multiple-resistance-controlling green degradable foam base fluid shown in fig. 1, the spraying-while-spraying-controlling and multiple-resistance-controlling green degradable foam base fluid provided by the embodiment comprises the following components in parts by mass: 86.9 parts of water, 8 parts of soybean protein, 3 parts of surfactant (dodecyl glucoside), 0.3 part of stabilizer (guar gum), 1.8 parts of peculiar smell absorbent and 5 mu m of particle size.
The odor absorbent of the embodiment is prepared from the following components in percentage by mass: 39.3% by weight of organobentonite (quaternary ammonium salt organically modified bentonite, montmorillonite content > 90% by weight), 25% by weight of urea, 35% by weight of hydrogen peroxide, 0.5% by weight of stabilizer (diethylamine tetraacetic acid), 0.2% by weight of surfactant (dodecyltrimethylammonium bromide), wherein the hydrogen peroxide is added in the form of a 30% by weight hydrogen peroxide solution. Mixing urea prepared in proportion with a stabilizer, adding a certain amount of hydrogen peroxide solution, quickly stirring at 30 ℃ (500 r/min) until the hydrogen peroxide solution is completely dissolved, and recrystallizing to obtain a urea peroxide solution; after the surfactant is matched with the organic bentonite, adding an organic solvent methanol, and stirring at a low speed (200 r/min) to obtain gel; adding the prepared urea peroxide solution into the gel, stirring and soaking at 30 ℃ for 4h, then carrying out ice bath, carrying out suction filtration, drying in an oven at 50 ℃ for 24h, then crushing and grinding in a ball mill, and sieving with a 400-mesh sieve to obtain the peculiar smell absorbent.
Crushing the waste soybean meal to 80 meshes, soaking the crushed waste soybean meal into a sodium hydroxide aqueous solution (1 mol/L) for alkaline leaching, wherein the leaching temperature is 25 ℃, the liquid-solid ratio is 15. And (3) adjusting the pH value of the alkaline solution of the soybean protein to be neutral, adding the surfactant, the stabilizer and the peculiar smell absorbent according to the mass part ratio, uniformly stirring at 500rpm for 10min, and thus obtaining the spraying-while-spraying and multiple-resistance-control green degradable foam base solution.
The main odor of the polluted soil is trichloroethylene, the concentration of the trichloroethylene in the soil is 1g/kg, and the concentration of the trichloroethylene in the air 20cm above the polluted soil is 722mg/m 3 The instant-spraying instant-control and multiple-resistance-control green degradable foam base solution prepared in the embodiment is foamed by a matched foam spraying device and is sprayed on the surface of the polluted soil, and the spraying thickness is 10cm. And starting timing sampling for analysis after the foam is laid.
After the green degradable foam base solution prepared by the embodiment is covered above the trichloroethylene polluted soil for 10min, the concentration of the trichloroethylene in the air 20cm away from the polluted soil is from 722mg/m 3 Reduced to 3mg/m 3 The removal rate reaches 99.6 percent.
Example 2
According to a schematic diagram of preparation and application processes of the spraying-as-controlling and multiple-resistance-controlling green degradable foam base fluid shown in fig. 1, the spraying-as-controlling and multiple-resistance-controlling green degradable foam base fluid provided by the embodiment comprises the following components in parts by mass: 90.3 parts of water, 6 parts of soybean protein, 2 parts of surfactant (sodium dodecyl benzene sulfonate), 0.2 part of stabilizer (gelatin), 1.5 parts of peculiar smell absorbent and 5 mu m of particle size.
The odor absorbent of the embodiment is prepared from the following components in percentage by mass: 45.4% by weight of organobentonite (quaternary ammonium salt organically modified bentonite, montmorillonite content > 90% by weight), 22.5% by weight of urea, 31.5% by weight of hydrogen peroxide, 0.3% by weight of stabilizer (salicylic acid), 0.3% by weight of surfactant (chitosan), wherein the hydrogen peroxide is added in the form of a 30% by weight hydrogen peroxide solution. Mixing urea prepared in proportion with a stabilizer, adding a certain amount of hydrogen peroxide solution, quickly stirring at 30 ℃ (600 r/min) until the hydrogen peroxide solution is completely dissolved, and recrystallizing to obtain a urea peroxide solution; after the surfactant is matched with the organic bentonite, adding an organic solvent methanol, and stirring at a low speed (300 r/min) to obtain gel; adding the prepared urea peroxide solution into the gel, stirring and soaking at 30 ℃ for 4h, carrying out ice bath, carrying out suction filtration, drying in an oven at 50 ℃ for 24h, grinding by using a ball mill, and sieving by using a 400-mesh sieve to obtain the peculiar smell absorbent.
Crushing the waste soybean meal to 80 meshes, soaking the crushed waste soybean meal into a potassium hydroxide aqueous solution (1 mol/L) for alkaline leaching, wherein the leaching temperature is 25 ℃, the liquid-solid ratio is 15. And (3) adjusting the pH value of the alkaline solution of the soybean protein to be neutral, adding the surfactant, the stabilizer and the peculiar smell absorbent according to the mass part ratio, uniformly stirring at 500rpm for 10min, and thus obtaining the spraying-while-spraying and multiple-resistance-control green degradable foam base solution.
The main odor of the polluted soil is dimethyl disulfide, the concentration of the dimethyl disulfide in the soil is 1g/kg, and the concentration of the dimethyl disulfide in the air 20cm above the polluted soil is 863mg/m 3 This example was preparedThe instant-spraying instant-control and multiple-resistance-control green degradable foam base liquid is foamed by a matched foam spraying device and is sprayed on the surface of the polluted soil, and the spraying thickness is 10cm. And starting timing sampling for analysis after the foam is laid.
After the green degradable foam base solution prepared by the embodiment is covered above the dimethyl disulfide polluted soil for 10min, the concentration of dimethyl disulfide in the air 20cm above the polluted soil is 863mg/m 3 Reduced to 23mg/m 3 The removal rate reaches 97.3 percent.
In conclusion, the environment-friendly degradable foam base liquid which is sprayed and controlled instantly and is subjected to multiple resistance control instantly meets the flexible use requirements of site remediation for odor resistance control in multiple scenes. In the invention, protein matrix foam generated by foaming of plant extract protein is used as a first physical resistance control, organobentonite adsorption of the odor absorbent is used as a second physical resistance control, and hydrogen peroxide in the odor absorbent slowly releases active oxygen to degrade odor to be a third physical resistance control; the triple resistance control means are superposed to solve the problem of single resistance control method for dissipating the odor in China, and the aim of multiple resistance control of the odor can be achieved. The compounded active substances in the invention strengthen the viscoelasticity of the foam, greatly prolong the stability time of the foam and meet the actual application requirement of long-acting prevention and control of the odor. More importantly, the invention takes the green degradable waste biomass as the raw material, has low cost, no toxicity, green degradability, simple and efficient treatment method, effectively treats the volatile peculiar smell substances in the polluted soil, and has the effective time of more than 48 hours.
Although the above embodiments have been described in detail, they are only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and all of the embodiments belong to the protection scope of the present invention.
Claims (10)
1. The immediate-spraying immediate-control and multiple-resistance-control green degradable foam base fluid is characterized by comprising the following components in parts by mass:
6 to 10 portions of vegetable protein, 1.5 to 2 portions of peculiar smell absorbent, 2 to 4 portions of first surfactant, 0.2 to 0.4 portion of first stabilizer and 83.6 to 92.3 portions of water;
the peculiar smell absorbent is prepared from the following components in percentage by mass: 39.3 to 45.4 weight percent of clay, 22.5 to 25 weight percent of urea, 31.5 to 35 weight percent of hydrogen peroxide, 0.3 to 0.5 weight percent of second stabilizer and 0.2 to 0.3 weight percent of second surfactant.
2. The immediate-spraying immediate-control and multiple-resistance-control green degradable foam base solution as claimed in claim 1, wherein the raw material for preparing the plant protein comprises one or more of waste rice bran, soybean meal and soybeans.
3. The spray-and-control and multiple-resistance-and-control green degradable foam base fluid as claimed in claim 1 or 2, wherein the preparation method of the plant protein comprises the following steps:
soaking the preparation raw material of the plant protein in an aqueous solution of inorganic strong base for leaching, and performing solid-liquid separation to obtain an alkaline solution of the plant protein, wherein the liquid-solid ratio during leaching is (10-20): 1; and neutralizing the alkaline solution of the plant protein to be neutral to obtain the aqueous solution of the plant protein.
4. The immediate spraying and controlling and multiple resistance controlling green degradable foam base solution as claimed in claim 3, wherein the leaching temperature is 20-30 ℃; the heat preservation time of the leaching is 0.5 to 12 hours; the molar concentration of the aqueous solution of the inorganic strong base is 0.6-1 mol/L; the particle size of the raw materials for preparing the vegetable protein is less than or equal to 0.18mm.
5. The immediate-spraying immediate-control and multiple-resistance-control green degradable foam base fluid as claimed in claim 1, wherein the particle size of the odor absorbent is 5-20 μm; the clay in the peculiar smell absorbent comprises one or more of bentonite, attapulgite and kaolin.
6. The spray-and-control and multiple-resistance-and-control green degradable foam base fluid as claimed in claim 1, wherein the first surfactant is a nonionic surfactant.
7. The spray-on-control and multiple-resistance-control green degradable foam base fluid as claimed in claim 1, wherein the first stabilizer is one or more of xanthan gum, gum arabic, guar gum, gelatin and carrageenan.
8. The use of the immediate spraying and immediate control, multiple resistance control green degradable foam base fluid of any one of claims 1 to 7 for treating the odor of the foul in the polluted soil.
9. The use of claim 8, wherein the malodour generating substances in the contaminated soil comprise one or more of benzene series, halogenated hydrocarbons and thioethers; the content of the malodorous substances in the polluted soil is 1g/kg.
10. The application according to claim 8, characterized in that it comprises the following steps:
spraying the instant-spraying and instant-controlling and multiple-resistance-controlling green degradable foam base solution of any one of claims 1 to 7 on the surface of the polluted soil after foaming;
during foaming, the volume ratio of the immediate-spraying immediate-control and multiple-resistance-control green degradable foam base liquid to air is 1 (5-15);
when the green degradable foam is sprayed, the spraying thickness of the formed instant spraying instant control and multiple resistance control green degradable foam is 10-30 cm.
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| CN116651912A (en) * | 2023-05-23 | 2023-08-29 | 生态环境部南京环境科学研究所 | Soil pretreatment device and pretreatment method for heavy metal contaminated soil remediation |
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