Method for controlling peculiar smell substances in soil of polluted land parcels

Abstract

The invention relates to a method for controlling peculiar smell substances in soil of a polluted land parcel, which belongs to the technical field of polluted land parcel soil treatment and comprises the following steps: 1) preparing materials: preparing a combustion agent, a foaming agent, an absorbent, loose soil, an ignition device, a foam injection machine, a soil detector, a soil turning machine and the like; 2) combustion treatment: firstly spreading the prepared combustion agent on a polluted land parcel; according to the method for controlling the odorous substances in the soil of the polluted plot, the odorous substances and part of combustible odorous gas in the soil of the polluted plot are combusted by using the combustion agent, then the incombustible odorous gas in the soil of the polluted plot is adsorbed by using the loose soil, and the unburned odorous gas is isolated by using the foam layer; and finally, an absorbent is used for absorbing a small amount of residual peculiar smell for ending, so that the cost of treating the peculiar smell substances in the soil of the polluted plot is reduced, and meanwhile, the treatment process is convenient to manage.

Description

Technical Field

[0001] The invention relates to the technical field of contaminated land soil treatment, and in particular to a method for controlling odorous substances in contaminated land soil. Background Art

[0002] Soil treatment of contaminated land is a complex and important process. Its main goal is to remove or reduce pollutants in the soil to prevent them from causing harm to the environment and human health. It includes odor treatment and material treatment of contaminated soil. Soil treatment of contaminated land can effectively protect the surrounding environment and ensure the health of people living nearby. It can not only restore the utilization value of land, realize the sustainable use of land resources, alleviate the problem of tight land resources, and promote the sustainable development of cities or regions. When selecting remediation technology, the nature of pollutants, soil conditions, remediation costs, environmental impacts and other factors should be comprehensively considered to formulate scientific and reasonable remediation plans.

[0003] In the prior art, the treatment of soil from contaminated plots is usually carried out by ozone method, biological method, dry neutralization method, etc. Among them, the biological method uses microorganisms to degrade organic matter into nutrients required by themselves, which has an inhibitory effect on the overflow of odors in solid and liquid substances, but it is difficult to take effect on the odors that have already been emitted, and it occupies a large area, has high investment, and is more troublesome to operate and manage. Therefore, a method for controlling odorous substances in soil from contaminated plots is proposed to solve the above problems. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides a method for controlling odorous substances in the soil of contaminated land, which has the advantages of low cost and easy management, and solves the problems that the soil of contaminated land is usually treated by ozone method, biological method, dry neutralization method, etc. Among them, the biological method uses microorganisms to degrade organic matter into nutrients required by themselves, which has an inhibitory effect on the overflow of odor in solid and liquid substances, but is difficult to take effect on odor that has already been emitted, and it occupies a large area, has high investment, and is relatively troublesome in operation and management.

[0006] (II) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solution: a method for controlling odorous substances in soil of polluted land, comprising the following steps:

[0008] 1) Material preparation: prepare combustion agent, foaming agent, absorbent, loose soil, ignition device, foam sprayer, soil detector and tiller, etc.;

[0009] 2) Combustion treatment: First, spread the prepared combustion agent on the contaminated land, and then use the ignition device to ignite the combustion agent, use the combustion agent to burn the soil of the contaminated land and remove the combustible odor, until the combustion agent is burned out, use a tiller to turn the soil of the contaminated land and mix it with the combustion agent to burn the remaining ashes;

[0010] 3) Adsorption filling: Then use loose soil to spread on the soil of the burned contaminated plot, and use the remaining ashes and loose soil after the combustion agent is burned to absorb the non-combustible odor in the soil of the contaminated plot;

[0011] 4) Physical isolation: Add the foaming agent to the foam sprayer, and use the foam sprayer to spray the foam onto the soil of the contaminated plot to form a foam layer. Use the formed foam layer to isolate the odor emitted by the soil of the contaminated plot, and wait for the ash and loose soil to absorb the odor for 2 days;

[0012] 5) Waste treatment: Clean the foam layer on the soil of the contaminated plot, and then use a soil detector to detect the odor of the soil of the contaminated plot. According to the test results, select absorbents of different concentrations to spray on the soil of the contaminated plot for neutralization, and keep the soil area of ​​the contaminated plot ventilated, so as to complete the control of odor substances in the soil of the contaminated plot.

[0013] Preferably, the combustion agent is dry firewood and dry crop straw.

[0014] Preferably, the thickness of the combustion agent is 2-3 cm, the thickness of the loose soil with a humidity of 5% is 2-5 cm, and the thickness of the foam layer is 3 cm.

[0015] Preferably, the loose soil is a mixture of small-particle soil with 5% moisture and dry small-particle soil.

[0016] Preferably, the foaming agent is prepared by mixing a surfactant, a thickener, a stabilizer, an oxidant, nanoparticles and water in a specific ratio.

[0017] Preferably, the absorbent is a biological agent or activated carbon.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention provides a method for controlling odorous substances in soil of polluted land, which has the following beneficial effects:

[0020] 1. The method for controlling odorous substances in the soil of the contaminated plot is to use a combustion agent to burn the odorous substances and some combustible odorous gases in the soil of the contaminated plot, and then use loose soil to absorb the non-combustible odorous gases in the soil of the contaminated plot, and use a foam layer to isolate the unburned odorous gases to prevent the odorous gases from diffusing into the air and polluting the environment, and finally use an absorbent to absorb the small amount of residual odor to finish, thereby reducing the cost of treating odorous substances in the soil of the contaminated plot and facilitating the management of the treatment process.

[0021] 2. The method for controlling odorous substances in the soil of the contaminated land is to mix the ashes produced by the combustion of the combustion agent into the soil of the contaminated land and combine it with loose soil to improve the adsorption efficiency of non-combustible odorous gases, so that the odorous gases can be treated more quickly. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1: A method for controlling odorous substances in soil of a polluted plot of land, comprising the following steps:

[0024] 1) Material preparation: prepare combustion agent, foaming agent, absorbent, loose soil, ignition device, foam sprayer, soil detector and tiller, etc.;

[0025] 2) Combustion treatment: First, spread the prepared combustion agent on the contaminated land, and then use the ignition device to ignite the combustion agent, use the combustion agent to burn the soil of the contaminated land and remove the combustible odor, until the combustion agent is burned out, use a tiller to turn the soil of the contaminated land and mix it with the combustion agent to burn the remaining ashes;

[0026] The thickness of the combustion agent is 2-3 cm, which is convenient for fully burning the combustible odorous gases and odorous substances. The combustion agent is dry firewood and dry crop straw, which reduces the impact of the combustion of the combustion agent on the surrounding environment, and uses the residual ashes after the combustion agent is burned to absorb the odorous gas.

[0027] 3) Adsorption filling: Then use loose soil to spread on the soil of the burned contaminated plot, and use the remaining ashes and loose soil after the combustion agent is burned to absorb the non-combustible odor in the soil of the contaminated plot;

[0028] In addition, the paving thickness of the loose soil with a humidity of 5% is 2-5 cm, and the loose soil is a mixture of small-particle soil with a humidity of 5% and dry small-particle soil, which is convenient for adsorbing non-flammable gases.

[0029] 4) Physical isolation: Add the foaming agent to the foam sprayer, and use the foam sprayer to spray the foam onto the soil of the contaminated plot to form a foam layer. Use the formed foam layer to isolate the odor emitted by the soil of the contaminated plot, and wait for the ash and loose soil to absorb the odor for 2 days;

[0030] It should be noted that the foaming agent is prepared by mixing surfactants, thickeners, stabilizers, oxidants, nanoparticles and water in a specific proportion. The thickness of the foam layer is 3 cm, which makes it easy to use the foam layer to isolate the diffusion of odorous gases.

[0031] 5) Waste treatment: Clean the foam layer on the soil of the contaminated plot, and then use a soil detector to detect the odor of the soil of the contaminated plot. According to the test results, select absorbents of different concentrations to spray on the soil of the contaminated plot for neutralization. The absorbent is a biological agent or activated carbon, which is convenient for absorbing and treating the small amount of residual odorous gas, and keep the soil area of ​​the contaminated plot ventilated, so as to complete the control of odorous substances in the soil of the contaminated plot.

[0032] The beneficial effects of the present invention are:

[0033] Combustion agents are used to burn off odorous substances and some combustible odorous gases in the soil of contaminated plots. The ash produced after the combustion of the combustion agent is mixed with the soil of the contaminated plot and combined with loose soil to improve the adsorption efficiency of non-combustible odorous gases. The odorous gases can be treated more quickly, and the foam layer is used to isolate the unburned odorous gases to prevent the odorous gases from diffusing into the air and polluting the environment. Finally, the absorbent is used to absorb the small amount of residual odor to finish off the process, thereby reducing the cost of treating odorous substances in the soil of contaminated plots and facilitating the management of the treatment process.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for controlling odorous substances in contaminated soil, characterized in that: The following steps are involved: 1) Material preparation: prepare combustion agent, foaming agent, absorbent, loose soil, ignition device, foam sprayer, soil detector and tiller, etc.; 2) Combustion treatment: First, spread the prepared combustion agent on the contaminated land, and then use the ignition device to ignite the combustion agent, use the combustion agent to burn the soil of the contaminated land and remove the combustible odor, until the combustion agent is burned out, use a tiller to turn the soil of the contaminated land and mix it with the combustion agent to burn the remaining ashes; 3) Adsorption filling: Then use loose soil to spread on the soil of the burned contaminated plot, and use the remaining ashes and loose soil after the combustion agent is burned to absorb the non-combustible odor in the soil of the contaminated plot; 4) Physical isolation: Add the foaming agent to the foam sprayer, and use the foam sprayer to spray the foam onto the soil of the contaminated plot to form a foam layer. Use the formed foam layer to isolate the odor emitted by the soil of the contaminated plot, and wait for the ash and loose soil to absorb the odor for 2 days; 5) Waste treatment: Clean the foam layer on the soil of the contaminated plot, and then use a soil detector to detect the odor of the soil of the contaminated plot. According to the test results, select absorbents of different concentrations to spray on the soil of the contaminated plot for neutralization, and keep the soil area of ​​the contaminated plot ventilated, so as to complete the control of odor substances in the soil of the contaminated plot.

2. The method for controlling odorous substances in contaminated soil according to claim 1, characterized in that: The combustion agent is dry firewood and dry crop straw.

3. The method for controlling odorous substances in contaminated soil according to claim 1, characterized in that: The thickness of the combustion agent is 2-3 cm, the thickness of the loose soil with a humidity of 5% is 2-5 cm, and the thickness of the foam layer is 3 cm.

4. The method for controlling odorous substances in contaminated soil according to claim 1, characterized in that: The loose soil is a mixture of small-particle soil with 5% moisture and dry small-particle soil.

5. The method for controlling odorous substances in contaminated soil according to claim 1, characterized in that: The foaming agent is prepared by mixing a surfactant, a thickener, a stabilizer, an oxidant, nanoparticles and water in a specific proportion.

6. The method for controlling odorous substances in contaminated soil according to claim 1, characterized in that: The absorbent is a biological agent or activated carbon.