CN111229814A - Method for in-situ remediation and risk control of alkaline contaminated soil - Google Patents
Method for in-situ remediation and risk control of alkaline contaminated soil Download PDFInfo
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- CN111229814A CN111229814A CN202010089107.3A CN202010089107A CN111229814A CN 111229814 A CN111229814 A CN 111229814A CN 202010089107 A CN202010089107 A CN 202010089107A CN 111229814 A CN111229814 A CN 111229814A
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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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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B79/00—Methods for working soil
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N61/00—Biocides, pest repellants or attractants, or plant growth regulators containing substances of unknown or undetermined composition, e.g. substances characterised only by the mode of action
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- 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
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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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
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- C09K2101/00—Agricultural use
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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
- C09K2109/00—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE pH regulation
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Abstract
The invention discloses a method for in-situ remediation and risk management and control of alkaline contaminated soil, which comprises soil ploughing, humic acid adding, humic acid mixing and covering maintenance. According to the invention, hydrogen ions released by macromolecules of humic acid are adopted to reduce the pH value of polluted soil, and compared with the traditional acid-base neutralization method, the damage of chemical agents to the soil function is reduced, and the soil fertility is increased; compared with the traditional acid-base neutralization method, the method adopts the humic acid which is widely available in the nature and low in price as the neutralizing agent and the fertility intensifier, so that the pH of the polluted soil is reduced, the addition of chemical agents is reduced, the neutralizing effect is improved, the repairing cost is reduced, the soil fertility is enhanced, and the salinization and secondary pollution of the soil are avoided; the method has the advantages of simple control parameters, mild conditions, easy implementation and suitability for actual repair engineering.
Description
Technical Field
The invention belongs to the technical field of soil remediation, and particularly relates to a method for in-situ remediation and risk control of alkaline contaminated soil.
Background
Sodium sulfide is used as a basic chemical raw material and a necessity of national life, and is widely applied to various industry fields. In the dye industry for the manufacture of sulphur dyes, sulphur blue or dye intermediate reducing agents, mordants and the like; as a flotation agent for ores in the nonferrous industry; depilatory for hides in the tanning industry; cooking agent for paper pulp in the paper industry. Sodium sulfide is also used in the manufacture of sodium sulfide, sodium polysulfide, sodium hydrosulfide, and the like. The method is used in cyanide zinc plating and silver alloy plating electrolyte and silver recovery in electroplating. Also widely used in industries such as pigment, rubber, etc. Also used for rayon denitration and reduction of nitrated compounds. In the pharmaceutical industry, it is used for producing antipyretic drugs such as phenacetin. In recent years, the rapid development of the production of Chinese high-grade environmental protection coatings, high-grade special engineering plastics, polyphenylene (aryl) sulfide and polysulfide rubber and other high, fine and sharp industries promotes the flourishing of the sodium sulfide market.
The production of sodium sulfide mainly adopts the steps of calcining raw material nitre, raw material coal (anthracite) and fuel coal (bituminous coal) at high temperature, then hot melting, evaporating the obtained concentrated alkali liquor and obtaining the sodium sulfide. The sodium sulfide produced by the method can generate a large amount of sodium sulfide waste residues, and the sodium sulfide can be hydrolyzed in aqueous solution to be strong alkaline (hydrolysis formula: Na) through rainwater leaching and air exposure2S+H2O ═ NaOH + NaHS), the sodium sulfide in the solution is slowly oxidized by oxygen in the air to form sodium sulfide sulfate (equation: 2Na2S++2O2+H2O＝Na2S2O3+2NaOH), so the alkali sulfide waste is caused to be strongly alkaline.
After the sodium sulfide waste residue yard is leached by rainwater, the pH of the soil at the lower part of the sodium sulfide waste residue yard is strong alkali, the content of organic matters in the soil polluted by sodium sulfide is low, the physical and chemical properties are poor, the water and fertilizer retention capacity is low, more harmful anions and cations are generated in the soil for the growth of crops, the growth and development of the crops are not facilitated, and the land productivity and the bearing capacity are low.
In the existing research, the research on the soil polluted by the sodium sulfide is less, only relevant literature reports adopt the calcium hypochlorite, but the calcium hypochlorite is added into the soil, so that the soil has the tendency of salinization and salinization, the soil function is more easily damaged, the risk management and control are carried out on the soil polluted by the sodium sulfide, the repair of the polluted soil is researched, and the ecological function is recovered. Through the research of the method, technical support is provided for practical engineering.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an economical, efficient and green method for repairing alkaline polluted soil.
The purpose of the invention is realized by the following technical scheme: a method for in-situ remediation and risk control of alkaline contaminated soil comprises the following steps:
s1, soil ploughing: leveling and ploughing the polluted soil;
s2, adding humic acid: adding humic acid into the ploughed polluted soil, wherein the mass ratio of the adding amount of the humic acid to the soil is 0.01-0.15: 1;
s3, mixing humic acid: mixing humic acid and soil by a rotary cultivator or manually to ensure that the humic acid and the soil are uniformly mixed;
s4, covering and maintaining: and (4) sprinkling water to the mixed polluted soil, and maintaining a certain water content for covering and maintaining for a period of time.
Further, the alkaline polluted soil is sodium sulfide polluted soil.
Further, in the step S1, the pH value of the polluted soil is 9-14, and the water content is 10% -50%.
Further, the plowing area of the contaminated soil in the step S1 is a contaminated area, the plowing depth is a soil contamination depth, and the soil contamination depth is 0.2-1 m.
Further, in the step S2, the humic acid has a humic acid content of 30-50% by mass, an organic matter content of 60-90% by mass and a water content of 20-30% by mass.
Further, in the step S4, the certain water content is maintained to be 30% -80%, and the curing time is 1-10 d.
The principle of the invention is as follows: humic acid is also called humus, is weak acid which is insoluble in water and soluble in alkali, can be subjected to neutralization reaction with alkaline substances in soil to reduce the pH value of the soil, and can be combined with various cations in the soil to generate humate to form a humic acid-humate interconversion buffer system. Meanwhile, humic acid is colloid with negative electricity, and after being combined with soil, the humic acid can increase the adsorption capacity of cations, play roles in isolating salt and absorbing salt, inhibit the rise of salt, reduce the salt content of surface soil, and prevent saline-alkali soil from being generated.
The sodium sulfide content in the soil polluted by the sodium sulfide is high, after the humic acid is applied, the sodium sulfide reacts with the humic acid, and the reaction product sodium humate is a crop growth hormone. In addition, humic acid is applied to the alkaline polluted soil, so that the structure of the surface layer of the soil is changed, capillaries are cut off, the condition of salt rising is destroyed, the salt separation effect is achieved, and the salt accumulation of the surface layer of the soil is reduced; on the other hand, the characteristic of large replacement amount of humic acid is exerted, and sodium ions in the soil solution are replaced and absorbed on the humic acid colloid, so that the harm of the sodium ions to crops is reduced.
The invention has the following advantages:
(1) the method adopted by the invention not only reduces the damage of chemical agents to the soil function, but also increases the soil fertility;
(2) the adopted medicament is humic acid which can form a buffer system for regulating acid and alkali and neutralize alkaline substances in soil, can increase the adsorption capacity of cations, plays roles of isolating and absorbing salt, and has the functions of improving soil, increasing nutrients, stimulating crop growth, detoxifying, preventing and treating plant diseases and insect pests, improving the activity of a bactericide and an insecticide and the like;
(3) compared with the traditional acid-base neutralization method, the method adopts the humic acid which is widely available in the nature and low in price as the neutralizing agent and the fertility intensifier, so that the pH of the polluted soil is reduced, the addition of chemical agents is reduced, the neutralizing effect is improved, the repairing cost is reduced, the soil fertility is enhanced, and the salinization and secondary pollution of the soil are avoided;
(4) the method has the advantages of simple control parameters, mild conditions, easy implementation and suitability for actual repair engineering.
Drawings
FIG. 1 is a schematic block diagram of a soil remediation method according to a specific embodiment of the invention.
Detailed Description
The invention is further described below with reference to the drawings and examples, without limiting the scope of the invention to the following.
Example 1:
the pH value of the soil polluted by the sodium sulfide is 9. The alkaline contaminated soil is remediated by the following steps.
Of the contaminated soilThe water content is 40 percent, and the soil density is 1.4g/cm3(S1) adopting a rotary cultivator to level and turn the polluted soil, wherein the turning area is 300m2The ploughing depth is 30 cm;
(S2) adding 1260kg of humic acid into the ploughed polluted soil, (S3) carrying out rotary tillage by adopting a rotary cultivator to uniformly mix the humic acid and the polluted soil, sprinkling water to keep the water content of the soil at 40 percent, and (S4) covering the soil by adopting a plastic film and maintaining for 3 d. And measuring the pH value of the soil after 3d, wherein the pH value of the soil reaches 7.
In the reaction step, humic acid molecules have a neutralization effect on soil, and in the reaction process, the humic acid macromolecules continuously remove protons (namely H +), and H < + > continuously removes hydroxyl in the soil, so that the pH value in the soil is reduced; humic acid macromolecules are combined with various cations in soil to generate humate, and a buffering system for mutual conversion of humic acid and humate is formed.
Example 2:
the pH value of the soil polluted by the sodium sulfide is 10. The alkaline contaminated soil is remediated by the following steps.
The water content of the polluted soil is 60 percent, and the soil density is 1.4g/cm3(S1) adopting a rotary cultivator to level and turn the polluted soil, wherein the turning area is 600m2The ploughing depth is 30 cm;
(S2) adding 2520kg humic acid into the ploughed polluted soil, (S3) carrying out rotary tillage by using a rotary cultivator to uniformly mix the humic acid and the polluted soil, sprinkling water to keep the water content of the soil at 60 percent, and (S4) covering the soil by using a plastic film and maintaining for 6 days. After 6d, measuring the pH value of the soil, wherein the pH value of the soil reaches 7.8.
Claims (6)
1. A method for in-situ remediation and risk control of alkaline contaminated soil is characterized by comprising the following steps:
s1, soil ploughing: leveling and ploughing the polluted soil;
s2, adding humic acid: adding humic acid into the ploughed polluted soil, wherein the mass ratio of the adding amount of the humic acid to the soil is 0.01-0.15: 1;
s3, mixing humic acid: mixing humic acid and soil by a rotary cultivator or manually to ensure that the humic acid and the soil are uniformly mixed;
s4, covering and maintaining: and (3) spraying water on the polluted soil mixed with the humic acid, and maintaining a certain water content for covering and maintaining for a period of time.
2. The method for in situ remediation and risk management of alkaline contaminated soil according to claim 1, wherein the alkaline contaminated soil is a sodium sulfide contaminated soil.
3. The method for in-situ remediation and risk management and control of alkaline contaminated soil according to claim 1, wherein the contaminated soil in the step S1 has a pH of 9-14 and a water content of 10-50%.
4. The method for in situ remediation and risk management of alkaline contaminated soil according to claim 1, wherein the plowing area of the contaminated soil in step S1 is a contaminated area, and the plowing depth is a soil contaminated depth.
5. The method for in-situ remediation and risk management and control of alkaline contaminated soil according to claim 1, wherein the humic acid in step S2 comprises 30-50% by mass of humic acid, 60-90% by mass of organic matter and 20-30% by mass of water.
6. The method for in-situ remediation and risk management and control of alkaline contaminated soil according to claim 1, wherein in the step S4, the certain water content is maintained at 30% -80%, and the maintenance time is 1-10 days.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010089107.3A CN111229814A (en) | 2020-02-12 | 2020-02-12 | Method for in-situ remediation and risk control of alkaline contaminated soil |
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| CN202010089107.3A CN111229814A (en) | 2020-02-12 | 2020-02-12 | Method for in-situ remediation and risk control of alkaline contaminated soil |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706624A (en) * | 2013-12-18 | 2014-04-09 | 广西大学 | Remediation method of heavy metal contaminated soil |
| CN104117529A (en) * | 2014-07-09 | 2014-10-29 | 华南师范大学 | In-situ remediation method of acidic soil containing heavy metals |
| CN105638011A (en) * | 2016-01-29 | 2016-06-08 | 四川农业大学 | Improving method of coastal high-chlorine saline soil |
| CN109997442A (en) * | 2019-03-19 | 2019-07-12 | 湖州灵粮生态农业有限公司 | A kind of method of biology in situ rehabilitating soil |
| CN110121963A (en) * | 2018-02-02 | 2019-08-16 | 中国科学院寒区旱区环境与工程研究所 | A kind of quick recovery method in salt-soda soil |
| CN110387241A (en) * | 2019-06-21 | 2019-10-29 | 深圳袁大高科农业发展有限公司 | A kind of salt affected soil improvement restorative procedure and its application |
-
2020
- 2020-02-12 CN CN202010089107.3A patent/CN111229814A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706624A (en) * | 2013-12-18 | 2014-04-09 | 广西大学 | Remediation method of heavy metal contaminated soil |
| CN104117529A (en) * | 2014-07-09 | 2014-10-29 | 华南师范大学 | In-situ remediation method of acidic soil containing heavy metals |
| CN105638011A (en) * | 2016-01-29 | 2016-06-08 | 四川农业大学 | Improving method of coastal high-chlorine saline soil |
| CN110121963A (en) * | 2018-02-02 | 2019-08-16 | 中国科学院寒区旱区环境与工程研究所 | A kind of quick recovery method in salt-soda soil |
| CN109997442A (en) * | 2019-03-19 | 2019-07-12 | 湖州灵粮生态农业有限公司 | A kind of method of biology in situ rehabilitating soil |
| CN110387241A (en) * | 2019-06-21 | 2019-10-29 | 深圳袁大高科农业发展有限公司 | A kind of salt affected soil improvement restorative procedure and its application |
Non-Patent Citations (1)
| Title |
|---|
| 佚名: "四川省雅安市四川雅安经济开发区管理委员会雅安市永兴镇硫化碱渣场风险管控药剂采购项目公开招标中标公告", 《四川政府采购》 * |
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