A green degradable foam base liquid with instant spraying and control and multiple barrier controls and its application in treating foul odor of polluted soil

Abstract

The present invention belongs to the technical field of odor treatment and control of contaminated sites, and specifically relates to a spray-control, multi-blocking green degradable foam base liquid and its application in treating the odor of contaminated soil. The spray-control, multi-blocking green degradable foam base liquid provided by the present invention comprises: 6 to 10 parts of plant protein, 1.5 to 2 parts of odor absorbent, 2 to 4 parts of first surfactant, 0.2 to 0.4 parts of first stabilizer, and 83.6 to 92.3 parts of water. The present invention uses plant protein and odor absorbent, and compound the first surfactant and the first stabilizer at the same time to form a spray-control, multi-blocking green degradable foam, which solves the problem of the single odor emission control method and the inflexible use scenario of the existing odor, and can achieve the purpose of multiple blocking of odor. After spraying, the odor released by the contaminated soil can be suppressed, the foam stability time is greater than 48 hours, and the foam components are green and degradable, and no secondary pollution is generated.

Description

Technical Field

[0001] The present invention belongs to the technical field of odor treatment and control of polluted sites, and specifically relates to an instant-spray-and-control, multi-barrier-control, green, degradable foam base liquid and its application in treating the odor of polluted soil. Background Art

[0002] As the remediation of contaminated sites progresses, a series of environmental safety issues have been exposed, among which the problem of foul odor emission during the site remediation process is particularly prominent.

[0003] In order to solve the problem of odor emission during soil remediation of contaminated sites, inflatable greenhouses are usually built to physically block the odor. Although this type of technology can temporarily alleviate the problem of odor emission during soil remediation, it still faces the problem of inflexible usage scenarios during actual use. Summary of the invention

[0004] The object of the present invention is to provide a green degradable foam base liquid that can be sprayed and controlled immediately and has multiple barrier controls, and its application in treating the odor of contaminated soil. The green degradable foam base liquid that can be sprayed and controlled immediately and has multiple barrier controls provided by the present invention has the characteristics of being sprayed and controlled immediately and having long-term barrier controls. It can meet the needs of spraying and controlling immediately in different usage scenarios of odor emission in contaminated soil remediation sites, and solves the problems of the existing odor emission control methods being single and the usage scenarios being inflexible.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides an instant-spray-and-controllable, multi-resistance-controlled, green, degradable foam base liquid, comprising the following components in parts by mass:

[0007] 6-10 parts of vegetable protein, 1.5-2 parts of odor absorbent, 2-4 parts of first surfactant, 0.2-0.4 parts of first stabilizer, 83.6-92.3 parts of water;

[0008] The odor absorbent is prepared from the following components in percentage by weight: 39.3-45.4 wt% of clay, 22.5-25 wt% of urea, 31.5-35 wt% of hydrogen peroxide, 0.3-0.5 wt% of a second stabilizer, and 0.2-0.3 wt% of a second surfactant.

[0009] Preferably, the raw materials for preparing the plant protein include one or more of waste rice bran, soybean meal and soybeans.

[0010] Preferably, the method for preparing the vegetable protein comprises the following steps:

[0011] The raw material for preparing the plant protein is immersed in an aqueous solution of an inorganic strong alkali for leaching, and after solid-liquid separation, an alkaline solution of the plant protein is obtained, and the liquid-solid ratio during the leaching is (10-20):1; the alkaline solution of the plant protein is neutralized to neutrality to obtain an aqueous solution of the plant protein.

[0012] Preferably, the extraction temperature is 20-30° C.; the extraction insulation time is 0.5-12 h; the molar concentration of the aqueous solution of the inorganic strong alkali is 0.6-1 mol / L; and the particle size of the raw material for preparing the plant protein is ≤0.18 mm.

[0013] Preferably, the particle size of the odor absorbent is 5 to 20 μm; the clay in the odor absorbent includes one or more of bentonite, attapulgite and kaolin.

[0014] Preferably, the first surfactant is a nonionic surfactant.

[0015] Preferably, the first stabilizer is one or more of xanthan gum, gum arabic, guar gum, gelatin and carrageenan.

[0016] The present invention provides the use of the instant-spraying and instant-controlling, multi-blocking and green degradable foam base liquid described in the above technical solution in the treatment of malodor in contaminated soil.

[0017] Preferably, the substances producing the malodor in the contaminated soil include one or more of benzene series, halogenated hydrocarbons and thioethers; and the content of the substances producing the malodor in the contaminated soil is 1 g / kg.

[0018] Preferably, the application comprises the following steps:

[0019] The instant-spray-and-control, multi-block-control green degradable foam base liquid described in the above technical solution is foamed and then sprayed on the surface of the contaminated soil;

[0020] During the foaming, the volume ratio of the instant-spraying and controllable, multi-resistance-controlled green biodegradable foam base liquid to air is 1:(5-15);

[0021] During the spraying, the spraying thickness of the formed green degradable foam with instant spraying and control and multiple resistance control is 10 to 30 cm.

[0022] The present invention provides a green degradable foam base liquid with instant spraying and multiple barrier controls, including the following components in mass fractions: 6-10 parts of plant protein, 1.5-2 parts of odor absorbent, 2-4 parts of first surfactant, 0.2-0.4 parts of first stabilizer, and 83.6-92.3 parts of water; the odor absorbent is prepared from the following components in mass percentage: 39.3-45.4wt% clay, 22.5-25wt% urea, 31.5-35wt% hydrogen peroxide, 0.3-0.5wt% second stabilizer, and 0.2-0.3wt% second surfactant. In the present invention, the protein matrix foam produced by the foaming of plant protein serves as the first physical barrier control; the adsorption effect of the organic bentonite in the odor absorbent serves as the second adsorption barrier control; the hydrogen peroxide in the odor absorbent can slowly release active oxygen to degrade substances with malodorous odors as the third degradation barrier control; the present invention can achieve the purpose of instant spraying and long-term barrier control by superimposing the triple barrier control means. The solution provided by the present invention solves the problem that the existing methods for controlling the emission of malodor are single and the usage scenarios are inflexible, and can achieve the purpose of multiple malodor control. At the same time, the instant spray-on, multiple-control green biodegradable foam base liquid provided by the present invention is compounded with the first surfactant and the first stabilizer with the plant protein and the odor absorbent, which strengthens the viscoelasticity of the foam and greatly prolongs the stability time of the foam. The foam stability time is greater than 48 hours, achieving the practical application demand for long-term malodor control.

[0023] The instant-spray-and-control, multi-blocking and green biodegradable foam base liquid provided by the present invention can be widely used to control odor substances in various polluted sites, including: preventing the acute volatilization of odor substances during the excavation of polluted sites, ensuring the safety of construction workers, and improving the quality of the surrounding air environment; replacing soil covering in landfills can effectively prevent the spread of odor substances and save manpower and material resources required for soil covering. Using the solution provided by the present invention to control odor pollution sources exposed to the air can effectively prevent the spread of odor substances into the atmosphere, and the effective time is greater than 48 hours.

[0024] Furthermore, the raw materials for preparing the plant protein include one or more of waste rice bran, waste soybean meal and waste soybean. The instant-sprayable and controllable, multi-resistance-controlled green degradable foam base liquid provided by the present invention has low cost and is suitable for large-scale application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the preparation and application process of the instant-sprayable, controllable, multi-resistance-controlled green biodegradable foam base liquid provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention provides an instant-spray-and-controllable, multi-resistance-controlled, green, degradable foam base liquid, comprising the following components in parts by mass:

[0027] 6-10 parts of vegetable protein, 1.5-2 parts of odor absorbent, 2-4 parts of first surfactant, 0.2-0.4 parts of first stabilizer, 83.6-92.3 parts of water;

[0028] The odor absorbent is prepared from the following components in percentage by weight: 39.3-45.4 wt% of clay, 22.5-25 wt% of urea, 31.5-35 wt% of hydrogen peroxide, 0.3-0.5 wt% of a second stabilizer, and 0.2-0.3 wt% of a second surfactant.

[0029] In the present invention, unless otherwise specified, all preparation raw materials / components are commercially available products well known to those skilled in the art.

[0030] Calculated by weight, the instant-sprayable, multi-blocking, green, degradable foam base liquid provided by the present invention comprises 6 to 10 parts of plant protein, preferably 6 to 8 parts, and particularly preferably 6 or 8 parts.

[0031] In the present invention, the raw materials for preparing the plant protein preferably include one or more of waste rice bran, soybean meal and soybean.

[0032] In the present invention, the method for preparing the vegetable protein preferably comprises the following steps:

[0033] The raw material for preparing the plant protein is immersed in an aqueous solution of an inorganic strong alkali for leaching, and after solid-liquid separation, an alkaline solution of the plant protein is obtained, and the liquid-solid ratio during the leaching is (10-20):1; the alkaline solution of the plant protein is neutralized to neutrality to obtain an aqueous solution of the plant protein.

[0034] In the present invention, the particle size of the raw material for preparing the plant protein is preferably ≤0.18 mm, more preferably ≤0.125 mm.

[0035] In the present invention, before the extraction, the raw material for preparing the plant protein is preferably crushed. The present invention has no special requirements for the specific implementation process of the crushing, and the raw material for preparing the plant protein is crushed to a particle size range of preferably ≤0.18 mm.

[0036] In the present invention, the inorganic strong base preferably includes sodium hydroxide and / or potassium hydroxide.

[0037] In the present invention, the molar concentration of the aqueous solution of the inorganic strong base is preferably 0.6 to 1 mol / L, more preferably 1 mol / L.

[0038] In the present invention, the liquid-to-solid ratio during the extraction is preferably 15:1.

[0039] In the present invention, the extraction temperature is preferably 20-30°C, more preferably 25°C.

[0040] In the present invention, the leaching insulation time is preferably 0.5 to 12 hours, more preferably 12 hours.

[0041] In the present invention, the leaching directly obtains an extract, and the present invention preferably performs solid-liquid separation on the extract to obtain the alkaline solution of the plant protein. In the present invention, the solid-liquid separation is preferably filtration.

[0042] After obtaining the alkaline solution of the plant protein, the present invention neutralizes the alkaline solution of the plant protein to neutrality to obtain the aqueous solution of the plant protein.

[0043] The present invention preferably uses the aqueous solution of plant protein with a neutral pH value directly as the plant protein component and water component of the instant-spray-and-control, multi-resistance-controlled green degradable foam base liquid. When the mass fraction of water in the aqueous solution of plant protein is different from that in the instant-spray-and-control, multi-resistance-controlled green degradable foam base liquid, the present invention preferably removes part of the water in the aqueous solution of plant protein or adds part of water to the aqueous solution of plant protein.

[0044] Based on the mass fraction of the plant protein, the instant-sprayable, multi-barrier green biodegradable foam base liquid provided by the present invention includes 1.5 to 2 parts of odor absorbent, preferably 1.5 to 1.8 parts, and specifically preferably 1.5 parts or 1.8 parts.

[0045] In the present invention, the particle size of the odor absorbent is preferably 5 to 20 μm, more preferably 5.5 to 18 μm.

[0046] In the present invention, the odor absorbent is prepared from the following components in percentage by weight: 39.3-45.4 wt% clay, 22.5-25 wt% urea, 31.5-35 wt% hydrogen peroxide, 0.3-0.5 wt% second stabilizer, and 0.2-0.3 wt% second surfactant.

[0047] In the present invention, the odor absorbent is preferably prepared from the following components in percentage: 39.3 wt % clay, 25 wt % urea, 35 wt % hydrogen peroxide, 0.5 wt % second stabilizer, and 0.2 wt % second surfactant.

[0048] In the present invention, the odor absorbent is preferably made of the following components in percentage by weight: 45.4 wt % clay, 22.5 wt % urea, 31.5 wt % hydrogen peroxide, 0.3 wt % second stabilizer, and 0.3 wt % second surfactant.

[0049] In the present invention, the clay in the odor absorbent preferably includes one or more of bentonite, attapulgite and kaolin.

[0050] In the present invention, the bentonite is preferably a quaternary ammonium salt organically modified bentonite, and the montmorillonite content in the bentonite is preferably >90wt%.

[0051] In the present invention, the second stabilizer preferably includes one or more of tartaric acid, salicylic acid, citric acid, diethylaminetetraacetic acid and sodium phosphate.

[0052] In the present invention, the second surfactant preferably includes one or more of dodecyltrimethylammonium bromide, hexadecyltrimethylammonium bromide, octadecyltrimethylammonium bromide and chitosan.

[0053] In the present invention, the content of montmorillonite in the organic bentonite is preferably greater than 90 wt %, and the organic bentonite is preferably a quaternary ammonium salt organically modified bentonite.

[0054] In the present 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 present invention has no special limitation on the amount of the hydrogen peroxide solution as long as the content of hydrogen peroxide in the odor absorbent is 31.5-35wt%.

[0055] The present invention also provides a method for preparing the odor absorbent, comprising the following steps:

[0056] Mixing urea, a second stabilizer and a hydrogen peroxide solution for recrystallization to obtain a urea peroxide solution;

[0057] mixing clay, a second surfactant and an organic solvent to obtain a gel;

[0058] The urea peroxide solution and the gel are mixed and then dried to obtain the odor absorbent.

[0059] The present invention mixes urea, a second stabilizer and a hydrogen peroxide solution for recrystallization to obtain a urea peroxide solution.

[0060] In the present invention, the mixing is preferably carried out by stirring at 30° C., and the stirring speed is preferably 500 to 600 r / min.

[0061] In a specific embodiment of the present invention, urea is preferably first added to the hydrogen peroxide solution, and then a stabilizer is added, heated to 30° C., and magnetically stirred until the stabilizer is dissolved.

[0062] In the present invention, the recrystallization temperature is preferably room temperature, and no additional heating or cooling is required.

[0063] The present invention mixes clay, a second surfactant and an organic solvent to obtain a gel.

[0064] In the present invention, the organic solvent is preferably methanol or ethanol. The present invention has no particular limitation on the amount of the organic solvent used, as long as a gel can be obtained.

[0065] In the present invention, the mixing is preferably carried out by stirring at 30° C., and the stirring speed is preferably 200 to 300 r / min.

[0066] After obtaining the urea peroxide solution and the gel, the present invention mixes the urea peroxide solution and the gel and then dries them to obtain the odor absorbent.

[0067] In the present invention, the urea peroxide solution is preferably added to the gel for immersion, followed by ice bathing and suction filtration. In the present invention, the immersion temperature is preferably 30° C. and the immersion time is preferably 4 hours.

[0068] The present invention has no particular limitation on the specific parameters of the ice bath and filtration.

[0069] After the filtration is completed, the present invention preferably sequentially dries and ball-mills the obtained solid product to obtain the odor absorbent.

[0070] In the present invention, the drying temperature is preferably 50° C., the drying time is preferably 24 hours, and the drying is preferably performed in an oven.

[0071] In the present invention, the ball milling is preferably performed until the obtained material passes through a 400-mesh sieve, and the ball milling is preferably performed in a ball mill.

[0072] Calculated by the mass percentage of the plant protein, the instant-spray-and-control, multi-blocking green biodegradable foam base liquid provided by the present invention comprises 2 to 4 parts of the first surfactant, preferably 2 to 3 parts, and particularly preferably 2 or 3 parts.

[0073] In the present invention, the first surfactant is preferably a nonionic surfactant, more preferably one or more of dodecyl glucoside, sodium dodecylbenzene sulfonate, hydroxypropyl methylcellulose, sodium dodecyl sulfate and sodium fatty acid methyl ester sulfonate.

[0074] Calculated by the mass fraction of the plant protein, the instant-sprayable, multi-blocked, green biodegradable foam base liquid provided by the present invention includes 0.2 to 0.4 parts of the first stabilizer, preferably 0.2 to 0.3 parts, and particularly preferably 0.2 parts or 0.3 parts.

[0075] In the present invention, the first stabilizer is preferably one or more of xanthan gum, gum arabic, guar gum, gelatin and carrageenan.

[0076] Calculated by the mass fraction of the plant protein, the instant-sprayable, multi-resistance-controlled green biodegradable foam base liquid provided by the present invention comprises 83.6 to 92.3 parts of water, preferably 84 to 92 parts.

[0077] In the present invention, the vegetable protein and water are preferably added in the form of the aqueous solution of the vegetable protein described in the above technical solution. When the mass fraction of water in the aqueous solution of the vegetable protein is different from the mass fraction of water in the instant spray-controllable, multi-resistance controlled green biodegradable foam base liquid, the present invention preferably removes part of the water in the aqueous solution of the vegetable protein or adds part of the water to the aqueous solution of the vegetable protein.

[0078] The present invention provides a method for preparing the instant-spraying and controllable, multi-resistance-controlled green biodegradable foam base liquid described in the above technical solution, preferably comprising the following steps:

[0079] The vegetable protein, the odor absorbent, the first surfactant, the first stabilizer and water are mixed to obtain the instant-sprayable and controllable, multi-blocking and green degradable foam base liquid.

[0080] In the present invention, the vegetable protein and water are preferably added in the form of the aqueous solution of the vegetable protein described in the above technical solution. When the mass fraction of water in the aqueous solution of the vegetable protein is different from the mass fraction of water in the instant spray-controllable, multi-resistance controlled green biodegradable foam base liquid, the present invention preferably removes part of the water in the aqueous solution of the vegetable protein or adds part of the water to the aqueous solution of the vegetable protein.

[0081] The present invention provides the use of the instant-spraying and instant-controlling, multi-blocking and green degradable foam base liquid described in the above technical solution in the treatment of malodor in contaminated soil.

[0082] In the present invention, the malodor-producing substances in the contaminated soil preferably include one or more of benzene series, halogenated hydrocarbons and thioethers.

[0083] In the present invention, the content of the foul-smelling substance in the contaminated soil is preferably 1 g / kg.

[0084] In the present invention, the application preferably comprises the following steps:

[0085] The instant-spray-and-control, multi-blocking and green degradable foam base liquid described in the above technical solution is foamed and sprayed on the surface of the contaminated soil.

[0086] During the foaming, the volume ratio of the instant-spraying and controllable, multi-resistance-controlled green biodegradable foam base liquid to air is 1:(5-15), preferably 1:(5-10).

[0087] During the spraying, the spraying thickness of the formed instant-spraying and controllable, multi-blocking and controllable green degradable foam is 10 to 30 cm, preferably 10 to 25 cm.

[0088] In the present invention, the foaming is preferably carried out in a foam spraying device.

[0089] In the present invention, the instant-spraying and controllable, multi-resistance-controlled green degradable foam base liquid is foamed by gas-liquid mixing and pore collision.

[0090] The instant-spray-and-control, multi-barrier-control green degradable foam base liquid provided by the present invention is an instant-spray-and-control, multi-barrier-control green degradable foam base liquid. In the present invention, the protein matrix foam produced by the foaming of plant protein obtained by extracting waste plants is used as the first physical barrier control, the adsorption effect of the organic bentonite in the odor absorbent is the second adsorption barrier control, and the hydrogen peroxide in the odor absorbent slowly releases active oxygen to degrade the malodor as the third degradation barrier control; the instant-spray-and-control, multi-barrier-control green degradable foam base liquid provided by the present invention mainly comprises plant protein and odor absorbent extracted from waste plants, and is compounded with a first surfactant and a first stabilizer to form an instant-spray-and-control, multi-barrier-control green degradable foam, which can suppress the malodor released by contaminated soil after spraying, and the foam stability time is greater than 48 hours, and the foam components are green and degradable without generating secondary pollution.

[0091] In order to further illustrate the present invention, the technical solution provided by the present invention is described in detail below in conjunction with the accompanying drawings and embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0092] Example 1

[0093] according to Figure 1 The schematic diagram of the preparation and application process of the instant-spray-and-controllable, multi-barrier-controlled green degradable foam base liquid shown in the figure, the instant-spray-and-controllable, multi-barrier-controlled green degradable foam base liquid provided in this embodiment includes the following components in parts by mass: 86.9 parts of water, 8 parts of soy protein, 3 parts of surfactant (dodecyl glucoside), 0.3 parts of stabilizer (guar gum), 1.8 parts of odor absorbent, and the particle size is 5 μm.

[0094] The odor absorbent of the present embodiment is prepared from the following components in percentage by weight: 39.3wt% of organic bentonite (quaternary ammonium salt organic modified bentonite, montmorillonite content>90wt%), 25wt% of urea, 35wt% of hydrogen peroxide, 0.5wt% of stabilizer (diethylaminetetraacetic acid), 0.2wt% of surfactant (dodecyltrimethylammonium bromide), wherein hydrogen peroxide is added in the form of 30wt% hydrogen peroxide solution. The urea and stabilizer prepared in proportion are mixed, a certain amount of hydrogen peroxide solution is added, and the solution is rapidly stirred (500r / min) at 30°C until the solution is completely dissolved for recrystallization to obtain a urea peroxide solution; after the surfactant is mixed with the organic bentonite, the organic solvent methanol is added and stirred at a low speed (200r / min) to obtain a gel; the prepared urea peroxide solution is added to the gel, and the solution is stirred and immersed at 30°C for 4 hours, and then ice-bathed, and then filtered, dried in an oven at 50°C for 24 hours, and then crushed and ground in a ball mill, and passed through a 400-mesh sieve to obtain an odor absorbent.

[0095] The waste soybean meal was crushed to 80 mesh and then immersed in a sodium hydroxide aqueous solution (1 mol / L) for alkaline extraction at a temperature of 25°C and a liquid-to-solid ratio of 15:1. After 12 hours of extraction, the alkaline solution of soybean protein was filtered to obtain. After adjusting the pH value of the alkaline solution of soybean protein to neutral, a surfactant, a stabilizer and an odor absorbent were added according to the above-mentioned mass proportions and stirred evenly at 500 rpm for 10 minutes to obtain a spray-and-control, multi-blocking, green, degradable foam base liquid.

[0096] The main odor of the contaminated soil in this implementation is trichloroethylene. The concentration of trichloroethylene in the soil is 1g / kg. The concentration of trichloroethylene in the air 20cm above the contaminated soil is 722mg / m 3 The instant-spray-and-control, multi-block-control green biodegradable foam base liquid prepared in this embodiment is foamed with a matching foam spraying device and sprayed on the surface of the contaminated soil with a spraying thickness of 10 cm. After the foam is laid, start timing sampling for analysis.

[0097] After the instant-spray-and-control, multi-blocking green biodegradable foam base liquid prepared in this example was applied to the trichloroethylene-contaminated soil for 10 minutes, the concentration of trichloroethylene in the air at 20 cm above the contaminated soil decreased from 722 mg / m 3 Reduced to 3 mg / m 3 , the removal rate reached 99.6%.

[0098] Example 2

[0099] according to Figure 1The schematic diagram of the preparation and application process of the instant-spray-and-controllable, multi-barrier-controlled green degradable foam base liquid shown in the figure, the instant-spray-and-controllable, multi-barrier-controlled green degradable foam base liquid provided in this embodiment includes the following components in parts by mass: 90.3 parts of water, 6 parts of soy protein, 2 parts of surfactant (sodium dodecylbenzene sulfonate), 0.2 parts of stabilizer (gelatin), 1.5 parts of odor absorber, and the particle size is 5 μm.

[0100] The odor absorbent of the present embodiment is prepared from the following components in percentage by weight: 45.4wt% of organic bentonite (quaternary ammonium salt organic modified bentonite, montmorillonite content>90wt%), 22.5wt% of urea, 31.5wt% of hydrogen peroxide, 0.3wt% of stabilizer (salicylic acid), 0.3wt% of surfactant (chitosan), wherein hydrogen peroxide is added in the form of 30wt% hydrogen peroxide solution. The urea and stabilizer prepared in proportion are mixed, a certain amount of hydrogen peroxide solution is added, and the solution is rapidly stirred (600r / min) at 30°C until the solution is completely dissolved for recrystallization to obtain a urea peroxide solution; after the surfactant is mixed with the organic bentonite, the organic solvent methanol is added and stirred at a low speed (300r / min) to obtain a gel; the prepared urea peroxide solution is added to the gel, and the solution is stirred and immersed at 30°C for 4 hours, and then ice-bathed, and then filtered, dried in an oven at 50°C for 24 hours, and then crushed and ground in a ball mill, and passed through a 400-mesh sieve to obtain an odor absorbent.

[0101] The waste soybean meal was crushed to 80 mesh and then immersed in a potassium hydroxide aqueous solution (1 mol / L) for alkaline extraction at a temperature of 25°C and a liquid-to-solid ratio of 15:1. After 12 hours of extraction, the alkaline solution of soybean protein was filtered to obtain. After adjusting the pH value of the alkaline solution of soybean protein to neutral, a surfactant, a stabilizer and an odor absorbent were added according to the above mass proportions and stirred evenly at 500 rpm for 10 minutes to obtain a spray-and-control, multi-blocking, green, degradable foam base liquid.

[0102] The main odor of the contaminated soil in this implementation is dimethyl disulfide, the concentration of dimethyl disulfide in the soil is 1g / kg, and the concentration of dimethyl disulfide in the air 20cm above the contaminated soil is 863mg / m 3 The instant-sprayable and controllable, multi-blocking and green biodegradable foam base liquid prepared in this example was foamed with a matching foam spraying device and sprayed on the surface of the contaminated soil with a spraying thickness of 10 cm. After the foam was laid, timed sampling and analysis were started.

[0103] After the instant-spray-and-control, multi-blocking green biodegradable foam base liquid prepared in this example was applied to the dimethyl disulfide contaminated soil for 10 minutes, the concentration of dimethyl disulfide in the air at 20 cm above the contaminated soil decreased from 863 mg / m 3 Reduced to 23 mg / m3 , the removal rate reached 97.3%.

[0104] In summary, the instant-spray-and-control, multi-blocking, green and degradable foam base liquid provided by the present invention can be sprayed and controlled, meeting the flexible use requirements of multiple scenarios for odor control in site remediation. In the present invention, the protein matrix foam produced by the foaming of plant-extracted protein serves as the first physical control, the organic bentonite adsorption of the odor absorbent serves as the second adsorption control, and the slow release of active oxygen by hydrogen peroxide in the odor absorbent to degrade the odor serves as the third degradation control; the superposition of the triple control means solves the problem of the single control method for the escape of odor in China, and can achieve the purpose of multiple control of odor. The various active substances compounded in the present invention enhance the viscoelasticity of the foam, greatly prolong the stability time of the foam, and achieve the practical application requirements of long-term control of odor. More importantly, the present invention uses green and degradable waste biomass as raw materials, is low-cost, non-toxic, green and degradable, and has a simple and efficient treatment method, which can effectively treat volatile odor substances in contaminated soil, with an effective time of more than 48 hours.

[0105] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A green biodegradable foam base liquid with instant spraying and controllable function and multiple resistance control, characterized in that: It is composed of the following components in parts by mass: 6-10 parts of vegetable protein, 1.5-2 parts of odor absorbent, 2-4 parts of first surfactant, 0.2-0.4 parts of first stabilizer, 83.6-92.3 parts of water; The odor absorbent is made of the following components in percentage by weight: 39.3-45.4 wt% clay, 22.5-25 wt% urea, 31.5-35 wt% hydrogen peroxide, 0.3-0.5 wt% second stabilizer, 0.2-0.3 wt% second surfactant; the second stabilizer is one or more of tartaric acid, salicylic acid, citric acid, diethylaminetetraacetic acid and sodium phosphate; the second surfactant is one or more of dodecyltrimethylammonium bromide, hexadecyltrimethylammonium bromide, octadecyltrimethylammonium bromide and chitosan; The particle size of the odor absorbent is 5 to 20 μm; The first stabilizer is one or more of gum arabic, guar gum, gelatin and carrageenan; the first surfactant is one or more of dodecyl glucoside, sodium dodecylbenzene sulfonate, hydroxypropyl methylcellulose, sodium dodecyl sulfate and sodium fatty acid methyl ester sulfonate; The method for preparing the vegetable protein comprises the following steps: The raw material for preparing the plant protein is immersed in an aqueous solution of an inorganic strong alkali for leaching, and the alkaline solution of the plant protein is obtained after solid-liquid separation. The raw material for preparing the plant protein is one or more of waste rice bran and soybean meal; the molar concentration of the aqueous solution of the inorganic strong alkali is 0.6-1 mol / L; the liquid-solid ratio during the leaching is (10-20):1; the insulation time of the leaching is 12 hours; the alkaline solution of the plant protein is neutralized to neutrality to obtain the aqueous solution of the plant protein.

2. The instant-spray-and-controllable, multi-resistance-controlled green biodegradable foam base liquid according to claim 1, characterized in that: The extraction temperature is 20-30° C.; the particle size of the raw material for preparing the plant protein is ≤0.18 mm.

3. The instant-spray-and-controllable, multi-resistance-controlled green biodegradable foam base liquid according to claim 1, characterized in that: The clay in the odor absorbent includes one or more of bentonite, attapulgite and kaolin.

4. Use of the instant-sprayable, multi-blocking, green, degradable foam base liquid as claimed in any one of claims 1 to 3 in treating malodor in contaminated soil.

5. The use according to claim 4, characterized in that: The substances producing the malodor in the contaminated soil include one or more of benzene series, halogenated hydrocarbons and thioethers; and the content of the substances producing the malodor in the contaminated soil is 1 g / kg.

6. The use according to claim 4, characterized in that: The application comprises the following steps: The instant-sprayable, multi-blocking and green degradable foam base liquid of any one of claims 1 to 3 is foamed and then sprayed on the surface of the contaminated soil; During the foaming, the volume ratio of the instant-spraying and controllable, multi-resistance-controlled green biodegradable foam base liquid to air is 1:(5-15); During the spraying, the spraying thickness of the formed green degradable foam with instant spraying and control and multiple resistance control is 10 to 30 cm.

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