CN111906137A - Method for soil remediation by using humic acid - Google Patents
Method for soil remediation by using humic acid Download PDFInfo
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- CN111906137A CN111906137A CN202010674016.6A CN202010674016A CN111906137A CN 111906137 A CN111906137 A CN 111906137A CN 202010674016 A CN202010674016 A CN 202010674016A CN 111906137 A CN111906137 A CN 111906137A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
- C09K17/18—Prepolymers; Macromolecular compounds
- C09K17/32—Prepolymers; Macromolecular compounds of natural origin, e.g. cellulosic materials
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a method for using humic acid to restore soil, and particularly relates to the technical field of soil restoration, which comprises the following steps: selecting lead-polluted soil, and detecting the content of effective lead in the soil; step two: uniformly spreading 0.5-1.0Kg of humic acid repairing agent per square meter on the soil surface of the selected soil area; step three: after deeply turning over the soil, covering a plastic film, and after 15 days, detecting the content of the effective lead in the soil again; step four: and comparing the two detection results, wherein the reduction rate of the effective state content of the soil is more than 20%, and the humic acid repairing agent can be stopped for carrying out the soil stopping and leveling period. The invention also provides the formula composition of the humic acid repairing agent, can obviously reduce the content of effective lead in soil, simultaneously improve the content of organic matters, can achieve the effect of applying the common soil repairing agent for several times by adding a small amount of the humic acid soil repairing agent, can reduce the use cost, and is beneficial to large-scale application.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a method for soil remediation by humic acid.
Background
The soil is an important component of ecological environment and one of main natural resources for human survival, the soil has certain self-cleaning capacity, but with the rapid development of world economy, pollutants such as various heavy metals and the like discharged in the production and life processes of human beings seriously exceed the self-cleaning capacity of the soil, the heavy metals can be continuously accumulated in the soil along with the passage of time, the normal growth of crops is influenced, and even the heavy metals are enriched in human bodies through ways such as food chains and the like, so the health of human beings is damaged;
lead pollution refers to the phenomenon that lead is used as a main pollutant to damage the environment, lead dust is emitted in the process of manufacturing lead powder and polar plates by using lead ingots to pollute the air, when lead smoke dust in the air reaches a certain concentration, the lead smoke dust is harmful to human bodies, the lead is used as an industrial raw material to be widely applied to industrial production currently, most of the lead is discharged into the environment in various forms of waste gas, waste water, waste residues and the like, heavy metal lead enters the soil, is difficult to degrade through the self-purification function of the soil, can be absorbed by crops and is harmful to the health of human beings.
Humic acid is a high molecular compound formed by animal and plant residues through complex biological and chemical actions, is rich in various active groups, has very wide application and is applied to various fields such as agriculture, industry, medicine, environmental protection and the like, has various types of humic acid, contains a large amount of regenerative humic acid in weathered coal, and the regenerative humic acid is one of important components of soil organic matters and can improve the soil structure, PH and other physicochemical properties;
the existing soil remediation agent has the problems of slow effect, large dosage and high input cost in the remediation of lead-contaminated soil.
Disclosure of Invention
In order to overcome the above defects in the prior art, the embodiments of the present invention provide a method for soil remediation with humic acid and a preparation process thereof, and the technical problems to be solved by the present invention are: the existing soil remediation agent has slow effect, large dosage and high input cost on the remediation of lead-polluted soil.
In order to achieve the purpose, the invention provides the following technical scheme: a method for restoring soil by humic acid comprises the following steps: selecting lead-polluted soil, and detecting the content of effective lead in the soil;
step two: uniformly spreading 0.5-1.0Kg of humic acid repairing agent per square meter on the soil surface of the selected soil area;
step three: after deeply turning over the soil, covering a plastic film, and after 15 days, detecting the content of the effective lead in the soil again;
step four: and comparing the two detection results, wherein the reduction rate of the effective state content of the soil is more than 20%, the humic acid repairing agent can be stopped, the soil is in a soil stopping and leveling period, otherwise, the steps II and III are repeated until the reduction rate of the effective state lead content in the soil and the effective state content of the soil measured for the first time is less than 20%, and the soil repairing process can be stopped.
In a preferred embodiment, the humic acid restoration agent comprises the following components in parts by weight: 30-40 parts of weathered coal humic acid, 25-35 parts of organic matter, 20-30 parts of sulfhydryl cellulose, 5-10 parts of trace elements and 50-60 parts of water.
In a preferred embodiment, the humic acid restoration agent comprises the following components in parts by weight: 35 parts of weathered coal humic acid, 30 parts of organic matter, 25 parts of sulfhydryl cellulose, 7.5 parts of trace elements and 55 parts of water.
In a preferred embodiment, in the formula of the humic acid repairing agent, the organic matter is crop straws and stubbles.
In a preferred embodiment, in the above formula of the humic acid repairing agent, the humic acid of weathered coal is extracted from weathered coal by using ultrasonic-KOH combined extraction process.
In a preferred embodiment, the ultrasonic-KOH combined extraction process comprises the following steps of firstly, adding a KOH solution into weathered coal according to a certain proportion, then, placing the weathered coal into an ultrasonic treatment device for treatment for a period of time, standing, centrifuging, taking out a supernatant, and finally, drying the taken-out supernatant to prepare powder for later use.
In a preferred embodiment, the input ratio of the weathered coal to the KOH solution is 1: 6.
In a preferred embodiment, the extraction power of the ultrasonic treatment device is 140W, the extraction time is 30-60min, and the temperature is adjusted to 40-60 ℃.
In a preferred embodiment, the drying treatment is freeze drying, the temperature is-40 ℃, the vacuum degree is 30Pa, and the treatment time is 24 h.
The invention has the technical effects and advantages that:
1. when the humic acid repairing agent prepared from weathered coal humic acid, organic matters, sulfhydryl cellulose, trace elements and water is applied to the lead-polluted soil for soil repairing, the content of effective lead in the soil is obviously reduced, the reduction rate of the content of the effective lead in the lead-polluted soil can reach 20% by one-time repairing, the content of the organic matters is improved, the sulfhydryl cellulose also has a certain adsorption effect on other heavy metals in the soil, and when the humic acid repairing agent is actually put into the soil repairing for use, the effect of applying the common soil repairing agent for several times can be achieved by adding a small amount of the humic acid soil repairing agent, the use cost can be reduced, the economic benefit is high, and the humic acid repairing agent is beneficial to large-scale application;
2. the invention is additionally added with the slow-release adhesive, weathered coal humic acid used in the humic acid repairing agent is extracted from weathered coal by adopting an ultrasonic-KOH combined extraction process, the weathered coal is one of main sources of mineral humic acid, the extraction process effectively extracts humic acid in the weathered coal, improves the overall application effect of the soil remediation agent, facilitates the application of humic acid in the weathered coal to reduce the content of effective lead in soil, can play a better role in repairing lead-polluted soil, can effectively reduce the lead content in plants, reduce the absorption of the plants to the lead in the soil and the toxic action of the lead to the plants, meanwhile, the weathered coal humic acid can improve the activities of sucrase, catalase and vein enzyme in soil, and after the humic acid is added into lead-polluted soil, the activity of soil enzyme is enhanced, thereby being beneficial to the rapid restoration of the soil.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for restoring soil by humic acid comprises the following steps: selecting lead-polluted soil, and detecting the content of effective lead in the soil;
step two: uniformly spreading 0.75Kg of humic acid repairing agent per square meter on the surface of the selected soil area;
step three: after deeply turning over the soil, covering a plastic film, and after 15 days, detecting the content of the effective lead in the soil again;
step four: and comparing the two detection results, wherein the reduction rate of the effective state content of the soil is more than 20%, the humic acid repairing agent can be stopped, the soil is in a soil stopping and leveling period, otherwise, the steps II and III are repeated until the reduction rate of the effective state lead content in the soil and the effective state content of the soil measured for the first time is less than 20%, and the soil repairing process can be stopped.
The humic acid repairing agent comprises the following components in parts by weight: the method comprises the following steps of firstly, adding a KOH solution into weathered coal according to the input ratio of 1:6, then, putting the weathered coal into an ultrasonic treatment device for treatment, wherein the extraction power is 140W, the extraction time is 45min, the temperature is adjusted to 50 ℃, standing and centrifuging the weathered coal, taking out supernatant, and finally, freeze-drying the taken-out supernatant to prepare powder for later use, wherein the temperature condition is-40 ℃, the vacuum degree is 30Pa, and the treatment time is 24 h.
Example 2
A method for restoring soil by humic acid comprises the following steps: selecting lead-polluted soil, and detecting the content of effective lead in the soil;
step two: uniformly spreading 0.75Kg of humic acid repairing agent per square meter on the surface of the selected soil area;
step three: after deeply turning over the soil, covering a plastic film, and after 15 days, detecting the content of the effective lead in the soil again;
step four: and comparing the two detection results, wherein the reduction rate of the effective state content of the soil is more than 20%, the humic acid repairing agent can be stopped, the soil is in a soil stopping and leveling period, otherwise, the steps II and III are repeated until the reduction rate of the effective state lead content in the soil and the effective state content of the soil measured for the first time is less than 20%, and the soil repairing process can be stopped.
The humic acid repairing agent comprises the following components in parts by weight: the method comprises the following steps of firstly, adding a KOH solution into weathered coal according to the input ratio of 1:6, then, putting the weathered coal into an ultrasonic treatment device for treatment, wherein the extraction power is 140W, the extraction time is 45min, the temperature is adjusted to 50 ℃, standing, centrifuging and taking out supernatant, and finally, freeze-drying the taken-out supernatant to prepare powder for later use, wherein the temperature condition is-40 ℃, the vacuum degree is 30Pa, and the treatment time is 24 hours.
Example 3
A method for restoring soil by humic acid comprises the following steps: selecting lead-polluted soil, and detecting the content of effective lead in the soil;
step two: uniformly spreading 0.75Kg of humic acid repairing agent per square meter on the surface of the selected soil area;
step three: after deeply turning over the soil, covering a plastic film, and after 15 days, detecting the content of the effective lead in the soil again;
step four: and comparing the two detection results, wherein the reduction rate of the effective state content of the soil is more than 20%, the humic acid repairing agent can be stopped, the soil is in a soil stopping and leveling period, otherwise, the steps II and III are repeated until the reduction rate of the effective state lead content in the soil and the effective state content of the soil measured for the first time is less than 20%, and the soil repairing process can be stopped.
The humic acid repairing agent comprises the following components in parts by weight: the method comprises the following steps of firstly, adding a KOH solution into weathered coal according to the input ratio of 1:6, then, putting the weathered coal into an ultrasonic treatment device for treatment, wherein the extraction power is 140W, the extraction time is 45min, the temperature is adjusted to be 50 ℃, standing and centrifuging the weathered coal, taking out supernatant, and finally, carrying out freeze drying on the taken-out supernatant to prepare powder for later use, wherein the temperature condition is-40 ℃, the vacuum degree is 30Pa, and the treatment time is 24 hours.
Example 4
A method for restoring soil by humic acid comprises the following steps: selecting lead-polluted soil, and detecting the content of effective lead in the soil;
step two: uniformly spreading the humic acid repairing agent with the dosage of 1.0Kg per square meter on the surface of the soil in the selected soil area;
step three: after deeply turning over the soil, covering a plastic film, and after 15 days, detecting the content of the effective lead in the soil again;
step four: and comparing the two detection results, wherein the reduction rate of the effective state content of the soil is more than 20%, the humic acid repairing agent can be stopped, the soil is in a soil stopping and leveling period, otherwise, the steps II and III are repeated until the reduction rate of the effective state lead content in the soil and the effective state content of the soil measured for the first time is less than 20%, and the soil repairing process can be stopped.
The humic acid repairing agent comprises the following components in parts by weight: the method comprises the following steps of firstly, adding a KOH solution into weathered coal according to the input ratio of 1:6, then, putting the weathered coal into an ultrasonic treatment device for treatment, wherein the extraction power is 140W, the extraction time is 45min, the temperature is adjusted to 50 ℃, standing, centrifuging and taking out supernatant, and finally, freeze-drying the taken-out supernatant to prepare powder for later use, wherein the temperature condition is-40 ℃, the vacuum degree is 30Pa, and the treatment time is 24 hours.
Soil restoration experiments are respectively carried out on the method for restoring soil by humic acid described in examples 1 to 4, so as to obtain the initial effective state lead content, the effective state lead content after restoration, the effective state lead content after secondary restoration, the lead content reduction rate and the organic matter average value of each example and the comparative example, the comparative example is that the soil is treated by the common soil restoration agent, and the test results are shown in the following table:
from the comparison in the table above, it can be seen that: comparative example 4 humic acid repairing agent prepared from 35 parts of humic acid of wind-cured coal, 30 parts of organic matter, 25 parts of sulfhydryl cellulose, 7.5 parts of trace elements and 55 parts of water,
according to the first step: selecting lead-polluted soil, and detecting the content of effective lead in the soil;
step two: uniformly spreading the humic acid repairing agent with the dosage of 1.0Kg per square meter on the surface of the soil in the selected soil area;
step three: after deeply turning over the soil, covering a plastic film, and after 15 days, detecting the content of the effective lead in the soil again;
step four: and comparing the two detection results, wherein the reduction rate of the effective state content of the soil is more than 20%, the humic acid repairing agent can be stopped, the soil is in a soil stopping and leveling period, otherwise, the steps II and III are repeated until the reduction rate of the effective state lead content in the soil and the effective state content of the soil measured for the first time is less than 20%, and the soil repairing process can be stopped.
When the humic acid soil remediation agent is applied to the soil remediation of the lead-contaminated soil, the initial effective lead content of the soil is reduced from 28.9mg/kg to 22.13mg/kg, the lead content reduction rate is 23.4%, and simultaneously the organic matter content is improved compared with that of a comparison group, meanwhile, the effective lead content reduction rate of the lead-contaminated soil can reach 20% through one-time remediation, and when the humic acid soil remediation agent is actually put into the soil remediation for use, the effect of applying the common soil remediation agent for several times can be achieved through the input of a small amount of humic acid soil remediation agent, the use cost can be reduced, the economic benefit is high, and the humic acid soil remediation agent is beneficial to large;
meanwhile, weathered coal humic acid used in the humic acid repairing agent is extracted from weathered coal by adopting an ultrasonic-KOH combined extraction process, the weathered coal is one of main sources of mineral humic acid, the humic acid in the weathered coal is effectively extracted by the extraction process, the overall application effect of the soil repairing agent is improved, the application of the weathered coal humic acid is favorable for reducing the content of effective lead in soil, the soil polluted by lead can be well repaired, the content of lead in plants can be effectively reduced, the absorption of the plants to the lead in the soil and the toxic action of the lead to the plants can be reduced, meanwhile, the weathered coal humic acid can improve the activities of sucrase, catalase and vein enzyme in the soil, and the activity of the soil enzyme is enhanced after the humic acid is added into the soil polluted by the weathered coal humic acid, so that the soil can be quickly repaired, and the weathered coal humic acid 35 parts of the weathered coal in the comparative example 4 is obtained The humic acid repairing agent prepared from 30 parts of organic matters, 25 parts of sulfhydryl cellulose, 7.5 parts of trace elements and 55 parts of water has the best repairing effect when applied to the soil polluted by lead for repairing the soil.
Finally, it should be noted that: although the present invention has been described in detail with reference to the general description and the specific embodiments, on the basis of the present invention, the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for restoring soil by humic acid comprises the following steps:
the method comprises the following steps: selecting lead-polluted soil, and detecting the content of effective lead in the soil;
step two: uniformly spreading 0.5-1.0Kg of humic acid repairing agent per square meter on the soil surface of the selected soil area;
step three: after deeply turning over the soil, covering a plastic film, and after 15 days, detecting the content of the effective lead in the soil again;
step four: and comparing the two detection results, wherein the reduction rate of the effective state content of the soil is more than 20%, the humic acid repairing agent can be stopped, the soil is in a soil stopping and leveling period, otherwise, the steps II and III are repeated until the reduction rate of the effective state lead content in the soil and the effective state content of the soil measured for the first time is less than 20%, and the soil repairing process can be stopped.
2. A method of using humic acid for soil remediation according to claim 1 wherein: the humic acid repairing agent comprises the following components in parts by weight: 30-40 parts of weathered coal humic acid, 25-35 parts of organic matter, 20-30 parts of sulfhydryl cellulose, 5-10 parts of trace elements and 50-60 parts of water.
3. A method of using humic acid for soil remediation according to claim 1 wherein: the humic acid repairing agent comprises the following components in parts by weight: 35 parts of weathered coal humic acid, 30 parts of organic matter, 25 parts of sulfhydryl cellulose, 7.5 parts of trace elements and 55 parts of water.
4. A method of using humic acid for soil remediation according to claim 2 wherein: in the formula of the humic acid repairing agent, organic matters are crop straws and stubbles.
5. A method of using humic acid for soil remediation according to claim 2 wherein: in the formula of the humic acid repairing agent, the weathered coal humic acid is extracted from weathered coal by adopting an ultrasonic-KOH combined extraction process.
6. A method of using humic acid for soil remediation according to claim 5 wherein: the ultrasonic-KOH combined extraction process comprises the following steps of firstly, adding a KOH solution into weathered coal according to a certain proportion, then, placing the weathered coal into an ultrasonic treatment device for treatment for a period of time, standing, centrifuging, taking out supernatant, and finally, drying the taken-out supernatant to prepare powder for later use.
7. A method of using humic acid for soil remediation according to claim 5 wherein: the input ratio of the weathered coal to the KOH solution is 1: 6.
8. A method of using humic acid for soil remediation according to claim 5 wherein: the extraction power of the ultrasonic treatment device is 140W, the extraction time is 30-60min, and the temperature is adjusted to 40-60 ℃.
9. A method of using humic acid for soil remediation according to claim 5 wherein: the drying treatment adopts a freeze drying method, the temperature condition is-40 ℃, the vacuum degree is 30Pa, and the treatment time is 24 h.
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