CN112122325A - Arsenic-polluted soil eluting agent and preparation method and application thereof - Google Patents
Arsenic-polluted soil eluting agent and preparation method and application thereof Download PDFInfo
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- CN112122325A CN112122325A CN202010765825.8A CN202010765825A CN112122325A CN 112122325 A CN112122325 A CN 112122325A CN 202010765825 A CN202010765825 A CN 202010765825A CN 112122325 A CN112122325 A CN 112122325A
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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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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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
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses an arsenic-polluted soil eluting agent and a preparation method and application thereof. The eluent of the embodiment of the invention fully utilizes the characteristics of tripolyphosphate and sodium hydroxide, and can transfer arsenic in soil to solution through the actions of ion exchange, dissolution and the like, and the solution of the invention can ensure that the removal rate of total arsenic in soil can reach more than 50 percent, so that the content of arsenic in soil is lower than the relevant standard, and the remediation target is achieved; the eluent of the scheme of the invention has simple components, is beneficial to the subsequent treatment of the elution waste liquid, has the advantages of low price of all selected reagents, environmental friendliness, small damage to soil matrix and the like, is beneficial to cost control, is also beneficial to environmental protection, and can simultaneously give consideration to economic benefits and environmental benefits.
Description
Technical Field
The invention relates to a field contaminated soil remediation technology, in particular to an arsenic contaminated soil eluting agent and a preparation method and application thereof.
Background
The mining and smelting of arsenic and arsenic-containing metals, the production of glass, pigments, raw chemicals and paper using arsenic or arsenic compounds as raw materials, the combustion of coal and other processes can produce arsenic-containing waste water, waste gas and waste residues, which pollute the environment. At present, how to improve arsenic pollution is a very serious environmental problem facing the world.
In the prior art, the remediation technology for arsenic-contaminated soil mainly adopts three approaches: 1) the isolation method is to isolate the polluted soil from the surrounding environment by adopting isolation technologies such as cement sealing, isolation walls and the like, so that the harm to the environment is reduced; 2) the occurrence form of arsenic in soil is changed by a physical, chemical or biological method, and the mobility, bioavailability and toxicity of arsenic are reduced; 3) arsenic is extracted from the polluted soil through technologies such as leaching, extraction, biological enrichment and the like, so that the arsenic content of the soil is reduced fundamentally. Although the leaching remediation technology inevitably causes different degrees of influence and damage to the physical and chemical properties of the soil, the leaching remediation technology not only can rapidly remove pollutants in the soil and has a stable remediation effect, but also has the advantages of simple operation, no direct contact of operators with the pollutants and the like, and thus becomes one of the hot spots and development directions of rapid remediation research of the polluted soil.
The arsenic in the soil has various forms, mainly comprises organic arsenic and inorganic arsenic, wherein the inorganic arsenic comprises arsine, arsenite (III) and arsenate (V), the toxicity of the arsenic in various states is greatly different, and the toxicity order is arsine, trivalent arsenic, pentavalent arsenic and organic arsenic. Although the toxicity of organic arsenic is the lowest, the amount of residual organic arsenic in the soil of the pesticide application area is about 1/2 of the total arsenic amount, so that in the arsenic-polluted soil remediation, arsenic in various forms needs to be remedied so as to thoroughly purify the soil. Chinese patent application CN109967513A discloses a method for remediating leaching of soil contaminated by cationic and anionic complex heavy metals, which discloses using polyphosphate as an eluent under acidic conditions to enable arsenate and phosphate in the soil to compete for adsorption sites on soil particles, thereby promoting desorption of anionic heavy metal arsenic in the soil, then adding ferrous sulfide to the eluent after solid-liquid separation, and adding the same to remove anionic and cationic heavy metals in the eluent.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the arsenic-polluted soil eluting agent provided by the invention can greatly improve the removal rate of total arsenic in soil.
The invention also provides a preparation method of the arsenic-polluted soil eluting agent.
The invention also provides an application of the arsenic-polluted soil eluting agent.
According to an embodiment of the first aspect of the present invention, the arsenic-contaminated soil eluting agent includes a tripolyphosphate solution and an inorganic base solution.
According to some embodiments of the invention, the concentration of tripolyphosphate in the arsenic-contaminated soil eluting agent is 0.1-1 mol/L; preferably 0.2 to 0.5 mol/L.
According to some embodiments of the invention, the inorganic base solution has a pH ≧ 13.
According to some embodiments of the invention, the inorganic base is selected from at least one of sodium hydroxide or potassium hydroxide.
According to some embodiments of the invention, the arsenic-contaminated soil leachant is comprised of a sodium tripolyphosphate solution and a sodium hydroxide solution.
The eluting agent according to the embodiment of the invention has at least the following beneficial effects: the eluent of the embodiment of the invention combines the characteristics of polyphosphate and inorganic strong base, can exchange arsenate ions from soil by using phosphate ions, and further dissolves arsenic in the soil by using sodium hydroxide, so that the removal rate of the total arsenic in the soil can reach more than 50%, the content of the arsenic in the soil is lower than the relevant standard, and the remediation target is achieved; the eluent of the scheme of the invention has simple components, is beneficial to the subsequent treatment of the elution waste liquid, has the advantages of low price of all selected reagents, environmental friendliness, small damage to soil matrix and the like, is beneficial to cost control, is also beneficial to environmental protection, and can simultaneously give consideration to economic benefits and environmental benefits.
The preparation method according to the second aspect embodiment of the present invention comprises the steps of:
and mixing and stirring the components of the eluting agent, and uniformly dispersing to obtain the arsenic-polluted soil eluting agent.
The preparation method according to the embodiment of the invention has at least the following beneficial effects: the preparation method of the scheme of the invention has the advantages of simplicity, few process steps, simple and convenient operation and wide industrial prospect.
According to the application of the third aspect of the invention, the method for leaching by using the arsenic-polluted soil leaching agent comprises the following steps:
adding a tripolyphosphate solution into the arsenic-polluted soil, stirring, performing solid-liquid separation, adding an inorganic alkali solution into the solid phase part, stirring again, performing solid-liquid separation, and collecting the obtained solid phase part, namely the repaired soil.
According to some embodiments of the invention, the volume-to-mass ratio of the tripolyphosphate solution to the arsenic-contaminated soil is (3-20) ml:1 g; preferably (3-15) ml:1 g; more preferably (5 to 10) ml:1 g.
According to some embodiments of the invention, the reaction time of the tripolyphosphate solution or the inorganic alkali solution and the arsenic-polluted soil is 30-180 min independently; preferably 60-120 min.
The application of the embodiment of the invention has at least the following beneficial effects: the eluent provided by the scheme of the invention is used for repairing arsenic-polluted soil, and the total arsenic content in the soil can be effectively reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description will be given with reference to the embodiments. The test methods used in the examples are all conventional methods unless otherwise specified; the materials, reagents and the like used are commercially available reagents and materials unless otherwise specified.
The first embodiment of the invention is as follows: the arsenic-polluted soil eluting agent comprises a sodium tripolyphosphate solution (hereinafter abbreviated as an eluting agent A) and a sodium hydroxide solution (hereinafter abbreviated as an eluting agent B), wherein the concentration of the sodium tripolyphosphate solution is 0.5mol/L, and the concentration of the sodium hydroxide solution is 0.5 mol/L.
The arsenic-polluted soil eluting agent is used for repairing arsenic-polluted soil, and the specific operation is as follows:
weighing 10g of contaminated soil (collected from an actual contaminated site in Guangzhou city, the total arsenic content in the soil is 135mg/kg, and the water content is 10%), placing the contaminated soil into a centrifuge tube, adopting a two-step leaching method, namely adding 50mL of leacheate A for reaction for 2h (the rotating speed is 40r/min, and the temperature is room temperature), centrifuging the sample, pouring out supernatant (reserving part of supernatant for measuring the arsenic content in the solution), adding 50mL of leacheate B, placing the mixture on a rotator for reaction for 2h (the rotating speed is 40r/min, and the temperature is room temperature), centrifuging the sample, and pouring out supernatant (reserving part of supernatant for measuring the arsenic content in the solution). The solid-to-liquid ratio of example 1 was 1g: 5 ml.
The second embodiment of the invention is an application of the arsenic-polluted soil eluting agent, which is different from the first embodiment in that: the solid-liquid ratio of the polluted soil to the leacheate A and the leacheate B is 1g to 10 ml.
The arsenic content in the solution is measured by an atomic fluorescence photometer to determine the arsenic concentration in the leacheate (after the reaction is finished, the sample is centrifuged, the supernatant is taken to pass through a 0.45 mu m filter membrane and then diluted by dilute nitric acid solution), and the residual arsenic content is determined by digesting the sample in the soil, so that the total arsenic removal rate in the soil is calculated.
The formula for calculating the removal rate of arsenic is as follows: the arsenic removal rate is the residual arsenic content in the soil after leaching/the arsenic content in the soil before leaching.
The arsenic content, arsenic removal rate and total arsenic removal rate of the leacheate leached in examples 1-2 were measured, and the results are shown in table 1 below:
TABLE 1 arsenic concentration in solutions treated in inventive examples 1-2
The single eluting agent has the following effects on the arsenic-polluted soil:
the first comparative example of the present invention is: an arsenic contaminated soil eluting agent, which is 0.5mol/L sodium hydroxide solution.
The second comparative example of the present invention is: an arsenic contaminated soil eluting agent is 0.5mol/L sodium tripolyphosphate solution.
The third comparative example of the present invention is: an arsenic contaminated soil eluting agent, which is 0.5mol/L phosphoric acid solution.
Comparative example four of the present invention is: an arsenic contaminated soil eluting agent is 0.5mol/L citric acid solution.
The fifth comparative example of the present invention is: an arsenic contaminated soil eluting agent, which is 0.5mol/L oxalic acid solution.
The arsenic-polluted soil eluting agent is used for repairing arsenic-polluted soil, and the specific operation is as follows:
weighing 10g of arsenic-contaminated soil, placing the arsenic-contaminated soil into a centrifuge tube (collected from an actual contaminated site in Guangzhou city, the arsenic content in the soil is 135mg/kg, the water content is 10%), adding 50mL of eluent, and placing the mixture on a rotator to react for 4h (the rotation speed is 40r/min, and the temperature is room temperature). After the reaction is finished, centrifuging the sample, taking supernate, filtering the supernate with a 0.45 mu m filter membrane, diluting the supernate with dilute nitric acid solution, and measuring the content of arsenic in the leacheate by using an atomic fluorescence spectrophotometer.
The arsenic content, arsenic removal rate and total arsenic removal rate of the leacheate leached by the comparative examples 1-5 are measured, and the results are shown in the following table 2:
TABLE 2 arsenic concentration in the solutions treated in comparative examples 1 to 5 according to the invention
As can be seen by comparing tables 1 and 2, the leaching effect is limited with sodium hydroxide or sodium tripolyphosphate alone.
The sixth comparative example of the present invention is: an arsenic-polluted soil eluting agent is a 0.5mol/L sodium tripolyphosphate solution (hereinafter referred to as an eluting solution A) and a 0.5mol/L phosphoric acid solution (hereinafter referred to as an eluting solution C).
The seventh comparative example of the present invention is: an arsenic-polluted soil eluting agent is 0.5mol/L sodium tripolyphosphate solution (hereinafter referred to as an eluting solution A) and 0.5mol/L citric acid solution (hereinafter referred to as an eluting solution C).
The arsenic-polluted soil eluting agent is used for repairing arsenic-polluted soil, and the specific operation is as follows:
weighing 10g of contaminated soil, placing the contaminated soil into a centrifuge tube (which is collected from an actual contaminated site in Guangzhou city, the arsenic content is 133.34mg/kg, and the water content is about 10%), adopting a two-step leaching method, namely adding 50mL of leacheate A for reaction for 2h (the rotating speed is 40r/min, the temperature is room temperature), centrifuging the sample, pouring out supernatant (the remaining part of the supernatant is used for measuring the arsenic content in the solution), adding 50mL of leacheate C, placing the mixture on a rotator for reaction for 2h (the rotating speed is 40r/min, the temperature is room temperature), centrifuging the sample, and pouring out the supernatant (the remaining part of the supernatant is used for measuring the arsenic content in the solution).
The arsenic content, arsenic removal rate and total arsenic removal rate of the leacheate leached by the comparative examples 6-7 were measured, and the results are shown in the following table 3:
TABLE 3 arsenic concentration in the solutions treated in comparative examples 6 to 7 according to the invention
The results of comparing table 1 and table 3 show that the total arsenic removal effect can be significantly improved by adopting the embodiment of the invention.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention in the specification or directly or indirectly applied to the related technical field are included in the scope of the present invention.
Claims (9)
1. The arsenic-polluted soil eluting agent is characterized by comprising the following components in parts by weight: the arsenic-contaminated soil eluting agent comprises a tripolyphosphate solution and an inorganic alkali solution.
2. The arsenic-contaminated soil eluting agent according to claim 1, wherein: the concentration of tripolyphosphate in the arsenic-polluted soil eluting agent is 0.1-1 mol/L; preferably 0.2 to 0.5 mol/L.
3. The arsenic-contaminated soil eluting agent according to claim 1, wherein: the pH value of the inorganic alkali solution is more than or equal to 13.
4. The arsenic-contaminated soil eluting agent according to claim 1, wherein: the inorganic base is at least one of sodium hydroxide or potassium hydroxide.
5. The arsenic-contaminated soil eluting agent according to claim 4, wherein: the arsenic-polluted soil eluting agent consists of a sodium tripolyphosphate solution and a sodium hydroxide solution.
6. A method for preparing the arsenic-contaminated soil eluting agent according to any one of claims 1 to 5, wherein: the method comprises the following steps:
and mixing and stirring the components of the eluting agent, and uniformly dispersing to obtain the arsenic-polluted soil eluting agent.
7. A method of leaching with the arsenic-contaminated soil leaching agent according to any one of claims 1 to 5, wherein: the method comprises the following steps:
adding a tripolyphosphate solution into the arsenic-polluted soil, stirring, performing solid-liquid separation, adding an inorganic alkali solution into the solid phase part, stirring again, performing solid-liquid separation, and collecting the obtained solid phase part, namely the repaired soil.
8. The method of claim 7, wherein: the volume mass ratio of the tripolyphosphate solution to the arsenic-polluted soil is (3-20) ml:1 g; preferably (3-15) ml:1 g; more preferably (5 to 10) ml:1 g.
9. The method of claim 7, wherein: the reaction time of the tripolyphosphate solution or the inorganic alkali solution and the arsenic-polluted soil is 30-180 min independently; preferably 60-120 min.
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| CN202010765825.8A CN112122325A (en) | 2020-08-03 | 2020-08-03 | Arsenic-polluted soil eluting agent and preparation method and application thereof |
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| CN202010765825.8A CN112122325A (en) | 2020-08-03 | 2020-08-03 | Arsenic-polluted soil eluting agent and preparation method and application thereof |
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Cited By (1)
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| CN115351060A (en) * | 2022-08-22 | 2022-11-18 | 广东环境保护工程职业学院 | Compound eluting agent, preparation method thereof and application thereof in removing cadmium and lead in soil |
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| US6210078B1 (en) * | 1999-06-02 | 2001-04-03 | Southern Company Services | Methods for the in situ removal of a contaminant from soil |
| JP2002018421A (en) * | 2000-07-10 | 2002-01-22 | National Institute Of Advanced Industrial & Technology | Washing agent for arsenic contaminated soil, stabilizer for the same and repairing method for the same by using these |
| CN103240267A (en) * | 2013-04-28 | 2013-08-14 | 华中师范大学 | Soil restoration method based on oxygen activation of iron powder and polyphosphoric acid molecules |
| CN105032910A (en) * | 2015-06-12 | 2015-11-11 | 湖南大学 | Composite eluting agent for repairing arsenic contaminated soil and application method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115351060A (en) * | 2022-08-22 | 2022-11-18 | 广东环境保护工程职业学院 | Compound eluting agent, preparation method thereof and application thereof in removing cadmium and lead in soil |
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Application publication date: 20201225 |