CN111420981B - Method for removing heavy metals in polluted soil for ecological garden treatment - Google Patents
Method for removing heavy metals in polluted soil for ecological garden treatment Download PDFInfo
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- CN111420981B CN111420981B CN202010272231.3A CN202010272231A CN111420981B CN 111420981 B CN111420981 B CN 111420981B CN 202010272231 A CN202010272231 A CN 202010272231A CN 111420981 B CN111420981 B CN 111420981B
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- heavy metals
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- leacheate
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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
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a method for removing heavy metals in polluted soil for ecological garden treatment, which uses leacheate containing 2-oxo-1, 3-imidazoline bisdithioformic acid as an active ingredient and is treated by microwaves. The leacheate disclosed by the invention can remove heavy metals in polluted soil and can avoid the loss of soil nutrient elements. The 1, 3-bis (sodium dithioformate) -2-oxo-imidazoline is selected as an eluent, has strong adsorption capacity on heavy metals, but has weak combination on metals such as Mg, Ca and the like.
Description
Technical Field
The invention belongs to the technical field of treatment of heavy metals in garden soil, and particularly relates to a method for removing heavy metals in polluted soil for ecological garden treatment.
Background
The current statistical data show that national soil pollution is serious, while the soil pollution is mainly inorganic pollution, wherein the heavy metal pollution accounts for more than 80%. The overproof rates of cadmium, mercury, arsenic and copper in the soil are respectively 7.0%, 1.6%, 2.7% and 2.1%. In ecological garden construction, in order to ensure normal growth of plants and human health, contaminated soil needs to be treated to remove heavy metals and other pollutants in the contaminated soil.
The physical remediation comprises the traditional methods of soil dressing, soil discharging, soil replacement and the like, an electrokinetic method, an electrothermal remediation technology, a vitrification technology, a frozen soil technology and the like. The chemical remediation is to select a proper chemical remediation agent according to the soil property and the heavy metal type and remove the heavy metal in the soil by utilizing the actions of desorption activation, oxidation reduction, chelation dissolution and the like. Bioremediation is the absorption, fixation, extraction and other actions of heavy metals by plants or microorganisms. The leaching method has high efficiency, can fundamentally remove heavy metals, and is the key to the selection of the leaching agent.
The eluting agent mainly comprises inorganic acid, inorganic salt, surfactant, chelating agent and the like, wherein the chelating agent can be well combined with heavy metal so as to effectively remove the heavy metal. Common chelating agents are ethylenediaminetetraacetic acid (EDTA), ethylenediamine disuccinic acid (EDDS), and the like. However, the chelating agent used at present can remove heavy metal ions and chelate other nutrients in the soil, such as Mg, Ca, etc., which results in nutrient loss. Therefore, there is a need to develop new eluting agents of chelating agents to minimize the loss of nutrients while removing heavy metals.
Through a large number of experiments, the known chelating agent is screened and modified, and the 2-oxo-1, 3-imidazoline bisdithioformic acid is found to be capable of acting with various heavy metal ions, but is weaker in combination with metals such as Mg, Ca and the like, and can be used as an eluent for soil heavy metals. So far, no research report of the 2-oxo-1, 3-imidazoline bisdithioformic acid for treating the soil heavy metal is found. In addition, the existing leaching method mostly adopts a mode of stirring the leacheate and the polluted soil, but the action of the leacheate and the heavy metal in the mode is not enough, and a new leaching method needs to be developed.
Disclosure of Invention
The invention aims to provide a method for removing heavy metals in polluted soil for ecological garden treatment and an improved leaching method.
The invention is realized by the following technical scheme:
a soil heavy metal leacheate comprises 2-oxo-1, 3-imidazoline bisdithioformic acid, alkali metal hydroxide and water, wherein the proportions of the 2-oxo-1, 3-imidazoline bisdithioformic acid and the alkali metal hydroxide are respectively 4-15% and 1-3% in parts by weight.
Preferably, the leacheate is added with 0.5 to 2 mass percent of reducing substances, such as sodium ascorbate, citric acid and the like, which can be used for reducing high-valence heavy metals possibly existing into low-valence easy-chelating forms, such as reducing hexavalent Cr into tetravalent Cr.
The active component of the leacheate adopted by the invention is 2-oxo-1, 3-imidazoline bisdithioformic acid, and the chemical structure is as follows:
wherein, a plurality of chelating sites such as thiocarbonyl, N atom, carbonyl and the like exist simultaneously, and a plurality of chelating modes are endowed to the chelating agent, so that the complexing effect on transition metal ions such as Pb, Cu and the like is increased, and the binding effect on alkaline earth metal is very weak. Thus, with 2-oxo-1, 3-imidazoline bisdithiocarboxylic acid as active ingredientThe leacheate can leach heavy metals in polluted soil and avoid the loss of soil nutrient elements.
A method for removing heavy metals in polluted soil for ecological garden improvement comprises the following steps:
an eluent containing 2-oxo-1, 3-imidazoline bisdithioformic acid as an active ingredient was used, and treated with microwave.
Preferably, the frequency of the microwave is 500-1000W, and the treatment time is 3-30 minutes.
The invention has the beneficial effects that:
the leacheate disclosed by the invention can remove heavy metals in polluted soil and can avoid the loss of soil nutrient elements. The 1, 3-bis (sodium dithioformate) -2-oxo-imidazoline is selected as an eluent, has strong adsorption capacity on heavy metals, but has weak combination on metals such as Mg, Ca and the like.
Detailed Description
The technical solutions in the present invention will be clearly and completely described below with reference to specific embodiments, and it should be understood 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 scope of protection of the present patent.
Example 1: preparation of leacheate
Dissolving 8g of 2-oxo-1, 3-imidazoline bisdithioformic acid in 92g of NaOH solution with the mass concentration of 2%, stirring for 1.5 hours, and obtaining the eluent after complete dissolution.
Example 2: soil remediation
Selecting polluted soil near a chemical plant, drying the soil, crushing the soil, and analyzing the content of metal in the soil by an atomic absorption spectrophotometer to obtain the following result:
the heavy metal content is: pb 189.36Mg/Kg, Cu 316.24Mg/Kg, 6-valent Cr 72.38Mg/Kg, and the nutrient elements Mg 168.26Mg/Kg and Ca 76.24 Mg/Kg.
The above dried soil was further ground into fine powder and sieved through a 40 mesh sieve. 20 g of the eluate was weighed into a reaction flask, 300mL of the eluate obtained in example 1 was added thereto, and the mixture was stirred slightly and subjected to 800W microwave treatment for 10 minutes. Transferring the soil into a centrifuge tube and carrying out centrifugal treatment to separate the treated soil from leacheate, removing supernatant after centrifugation, drying the lower soil, and testing the content of metal elements in the lower soil, wherein the results are shown as follows:
the contents (mg/Kg) of metals in the soil after the leacheate is combined with the microwave treatment are as follows in sequence: 42.68, 92.38, 18.35, 147.52, 69.76.
Therefore, the leaching solution of the invention has high removal efficiency on heavy metals, and the leaching method combined with microwave treatment has high efficiency and improves removal efficiency.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (5)
1. A method for removing heavy metals in polluted soil for ecological garden management is characterized by comprising the following steps: using an eluent containing as an active ingredient a compound having the structure:
and treating with microwave; the rinse solution also contains an alkali metal hydroxide and water.
2. The method for removing heavy metals from contaminated soil for ecological landscape architecture improvement, according to claim 1, wherein: the leacheate also contains a reducing substance.
3. The method for removing heavy metals from contaminated soil for ecological landscape architecture improvement, according to claim 2, wherein: the reducing substance is sodium ascorbate and citric acid.
4. The method for removing heavy metals from contaminated soil for ecological landscape management as set forth in any one of claims 1 to 3, wherein: the active ingredients in the leacheate account for 4-15% of the total leacheate by weight.
5. The method for removing heavy metals from contaminated soil for ecological landscape management as set forth in any one of claims 1 to 3, wherein: the frequency of the microwave is 500-1000W, and the treatment time is 3-30 minutes.
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| CN202010272231.3A CN111420981B (en) | 2020-04-09 | 2020-04-09 | Method for removing heavy metals in polluted soil for ecological garden treatment |
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| CN202010272231.3A CN111420981B (en) | 2020-04-09 | 2020-04-09 | Method for removing heavy metals in polluted soil for ecological garden treatment |
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| CN111420981B true CN111420981B (en) | 2021-05-04 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5968245A (en) * | 1997-09-17 | 1999-10-19 | Encapco | Composition for solid waste remediation |
| CN101805293A (en) * | 2010-04-14 | 2010-08-18 | 聂世保 | 1 (dimethylamino) ethyl, 3-hydroxy-imidazoline hydrochloride and preparation method thereof |
| CN102492071A (en) * | 2011-12-09 | 2012-06-13 | 湖南科技大学 | Macromolecule chelating agent and preparation method thereof |
| CN102491473A (en) * | 2011-12-09 | 2012-06-13 | 湖南科技大学 | High molecular heavy metal chelating flocculant and preparation method thereof |
| CN106238449A (en) * | 2016-08-30 | 2016-12-21 | 樊之雄 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN107470341A (en) * | 2017-07-26 | 2017-12-15 | 昆明理工大学 | A kind of restorative procedure of heavy-metal contaminated soil |
-
2020
- 2020-04-09 CN CN202010272231.3A patent/CN111420981B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5968245A (en) * | 1997-09-17 | 1999-10-19 | Encapco | Composition for solid waste remediation |
| CN101805293A (en) * | 2010-04-14 | 2010-08-18 | 聂世保 | 1 (dimethylamino) ethyl, 3-hydroxy-imidazoline hydrochloride and preparation method thereof |
| CN102492071A (en) * | 2011-12-09 | 2012-06-13 | 湖南科技大学 | Macromolecule chelating agent and preparation method thereof |
| CN102491473A (en) * | 2011-12-09 | 2012-06-13 | 湖南科技大学 | High molecular heavy metal chelating flocculant and preparation method thereof |
| CN106238449A (en) * | 2016-08-30 | 2016-12-21 | 樊之雄 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN107470341A (en) * | 2017-07-26 | 2017-12-15 | 昆明理工大学 | A kind of restorative procedure of heavy-metal contaminated soil |
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