CN112694892A - Soil leaching composition for removing mercury, application thereof and method for repairing soil - Google Patents
Soil leaching composition for removing mercury, application thereof and method for repairing soil Download PDFInfo
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- CN112694892A CN112694892A CN201911007004.1A CN201911007004A CN112694892A CN 112694892 A CN112694892 A CN 112694892A CN 201911007004 A CN201911007004 A CN 201911007004A CN 112694892 A CN112694892 A CN 112694892A
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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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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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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 relates to the field of heavy metal contaminated soil remediation, and discloses a soil leaching composition for removing mercury, application thereof and a method for remediating soil, wherein the composition comprises the following components in parts by weight: cysteine and biosurfactants; wherein the mass ratio of the cysteine to the biosurfactant is (0.3-8): 1. the method for restoring soil comprises the following steps: and (3) restoring the mercury-polluted soil to be restored by using the soil leaching composition for removing mercury. The soil leaching composition for removing mercury provided by the invention not only solves the problem that the treatment efficiency and the environmental friendliness of the mercury-polluted soil leaching agent in the prior art cannot be considered at the same time, but also can overcome the problem that the low-permeability soil is difficult to leach, and is effective to both silt and clay.
Description
Technical Field
The invention relates to the field of heavy metal contaminated soil remediation, in particular to a soil leaching composition for removing mercury, application thereof and a method for remediating soil.
Background
With the rapid development of industry, the heavy metal soil pollution is continuously increased, land resources are damaged, and the social development process is seriously hindered. Corresponding soil remediation technologies are produced at the same time and can be roughly divided into three categories: physical repair, chemical repair, and biological repair. The physical remediation also comprises an electrodynamic method, an electric heating remediation, a vitrification technology, a frozen soil technology and the like besides the traditional methods of soil dressing, soil dumping, soil replacement and the like; the chemical remediation is that according to the soil property and the heavy metal type, a proper chemical remediation agent is selected, and the heavy metal in the soil is removed by utilizing the effects of desorption activation, oxidation reduction, chelation dissolution and the like; bioremediation is soil remediation by using the effects of heavy metal absorption, fixation, extraction and the like of plants or microorganisms.
Compared with the restoration technology of methods such as stabilization, immobilization and the like, the soil leaching method has high treatment efficiency and can fundamentally remove heavy metals in the soil so as to thoroughly eliminate the potential threat of the heavy metals. The core problem of the leaching method is the choice of the leaching agent, so that the development of a green and efficient leaching agent is very important.
CN107365585A discloses an environment-friendly cadmium metal polluted soil eluting agent and a preparation method thereof. The invention comprises the following steps: preparing 10-30 parts of natural chelating agent with the mass concentration of 1-5%, 20-40 parts of biosurfactant with the mass concentration of 0.5-5% and 0.1-1 part of pH regulator, uniformly mixing, and diluting to 100 parts to obtain the cadmium metal polluted soil eluting agent. Although the eluting agent is easy to degrade and has no secondary pollution, the removing efficiency of the eluting agent on heavy metals needs to be improved.
CN102976577A discloses a composite eluent for removing heavy metals in precipitated sludge. The eluting agent comprises the following main components: the preparation A is sodium dodecyl benzene sulfonate, the preparation B is TritonX-100, the preparation C is an ethanol solution of a biosurfactant, and the mass ratio of the preparation A to the preparation B is as follows: the agent B is 1:10-1:15, and the agent C is 0.5-1% of the mass of the compound eluting agent. The compound eluting agent disclosed by the invention can effectively remove heavy metals in precipitated sludge generated by urban water treatment, but is used for eluting general soil, lacks of dissolving and dispersing effects on the soil and is difficult to achieve the aim of removing the heavy metals in the soil.
For mercury pollution, the leaching agent in the prior art is difficult to play a good role, and research needs to be carried out on mercury removal.
Disclosure of Invention
The invention aims to solve the problem of low mercury treatment efficiency of a heavy metal soil eluting agent in the prior art, and provides a soil eluting composition for removing mercury, application thereof and a method for repairing soil. The soil leaching composition for removing mercury provided by the invention is environment-friendly in components and high in mercury removal efficiency.
In a first aspect, the present invention provides a soil washing composition for mercury removal, the composition comprising cysteine and a biosurfactant; wherein the mass ratio of the cysteine to the biosurfactant is (0.3-8): 10.
in a second aspect, the invention provides the use of a soil washing composition as described above for mercury removal in remediation of mercury contaminated soil. When the soil leaching composition provided by the invention is used for repairing mercury-polluted soil, the mercury removal efficiency is improved more favorably, and the environment is friendly.
In a third aspect, the present invention provides a method of remediating soil comprising: the soil leaching composition for removing mercury provided by the invention is used for repairing the mercury-polluted soil to be repaired.
Preferably, the method comprises: and leaching the mercury-contaminated soil to be repaired by using an eluent containing the soil leaching composition for removing mercury.
Cysteine is a natural amino acid containing sulfydryl, and can have strong complexation capacity on mercury to form thiolate; biosurfactants can aid in the flow of thiolates from the soil into the liquid phase. The mercury-contaminated soil can be efficiently repaired by matching the two. The soil leaching composition has high mercury removal efficiency.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In a first aspect the present invention provides a soil washing composition for mercury removal, the composition comprising: cysteine and biosurfactants;
wherein the mass ratio of the cysteine to the biosurfactant is (0.3-8): 10.
preferably, the mass ratio of the cysteine to the biosurfactant is (1-8): 10, preferably (4-5): 10. that is, the content of cysteine is preferably 1 to 8 parts by weight, for example, 1 part by weight, 4 parts by weight, 8 parts by weight, and any value within a range of any two of these points, based on 10 parts by weight of the biosurfactant. The content of cysteine is more preferably 4 to 5 parts by weight, for example, 4 parts by weight, 4.3 parts by weight, 4.7 parts by weight, 5 parts by weight, and any value within a range of any two of these points, based on 10 parts by weight of the biosurfactant. The preferred mass ratio of cysteine to biosurfactant used in the present invention is more favorable for improving the mercury removal efficiency.
The biosurfactant is preferably selected from one or more of sophorolipid, rhamnolipid, algal glycolipid, iturin and fengycin.
The soil washing composition for removing mercury provided by the invention does not contain components which can damage the soil environment, so that secondary pollution can not be caused when the soil washing composition is used for soil remediation. Compared with the prior art, the soil leaching composition for removing mercury provided by the invention has the advantages that the soil leaching efficiency is obviously improved, the problem of difficulty in leaching low-permeability soil can be solved, and the soil leaching composition is effective to both silt and clay. Therefore, the problem that the treatment efficiency and the environmental friendliness of the mercury-polluted soil eluting agent in the prior art cannot be considered at the same time and the problem that the low-permeability soil is difficult to elute are solved.
In a second aspect, the present invention provides the use of a soil washing composition as described above for mercury removal for remediation of mercury contaminated soil. The soil leaching composition for removing mercury provided by the invention is particularly suitable for repairing soil polluted by mercury.
According to the invention, the soil is soil in the meaning known in the art, being a mixture of minerals, organic matter, living organisms and water and air.
According to the invention, the mercury-contaminated soil is soil contaminated by mercury. The mercury-contaminated soil contains mercury, and the content of mercury in the soil is not particularly limited, and for example, the mercury content in the mercury-contaminated soil may be several times of the regulated value of a construction site.
In a third aspect, the present invention provides a method of remediating soil comprising: the soil leaching composition for removing mercury provided by the invention is used for repairing the mercury-polluted soil to be repaired.
The inventor of the present invention needs to explain here that, when the soil leaching composition provided by the present invention is used for remedying the mercury-contaminated soil to be remediated, the components in the soil leaching composition for removing mercury need to be proportioned together and added to the soil to be remediated.
According to a specific embodiment of the present invention, the method comprises: and leaching the mercury-contaminated soil to be repaired by using an eluent containing the soil leaching composition for removing mercury.
According to the method for restoring soil provided by the present invention, preferably, the concentration of the soil leaching composition for removing mercury in the leaching agent is 2 to 3.6 wt%, more preferably 2.8 to 3 wt%, for example, 2.8 wt%, 2.9 wt%, 3 wt%, and any value within the range formed by any two of these points. The solvent of the eluent can be water.
According to the method for restoring soil provided by the invention, preferably, the weight ratio of the eluting agent to the mercury-contaminated soil to be restored (2-10) is as follows: 1, preferably (5-6): 1. e.g., 5:1, 5.2:1, 5.4:1, 5.6:1, 5.8:1, 6:1, and any value within the range of any two of these point values.
According to the method for restoring soil provided by the invention, the leaching rate is preferably 1-3mL/min, and preferably 1.8-2.2 mL/min. The specific operation of the leaching is not particularly limited in the present invention, and can be carried out according to a conventional technique in the art. The present invention will not be described herein.
According to an embodiment of the invention, the mercury-contaminated soil to be remediated contains mercury. The method provided by the invention is particularly suitable for removing the mercury element.
The present invention will be described in detail below by way of examples.
The mercury content in the soil was measured by atomic fluorescence analysis.
Cysteine was purchased from comedy cyclodextrin technologies ltd, shorea, shandong;
rhamnolipid, sophorolipid, algal glycolipid and iturin were purchased from west amp bo di speciality chemical ltd; finelefin is purchased from Biotech, Inc.
Example 1
The polluted soil is taken from silt of a factory in Hebei, crushed stone impurities are removed, the soil is dried and sieved by a 50-mesh sieve, and the mercury-polluted soil to be repaired is obtained and contains 133mg/kg of mercury.
The composition and the content of each component of the soil washing composition for removing mercury are shown in table 1, wherein the mass ratio of cysteine to biosurfactant is 2: 5.
and adding water to dissolve the soil leaching composition for removing mercury and diluting to 1600g to obtain the composite leaching agent. And filling 250g of the soil sample of the mercury-polluted soil to be repaired into a leaching column, leaching the mercury-polluted soil to be repaired at a leaching rate of 1.8mL/min by adopting 1250g of the composite leaching agent, and after leaching, drying the soil sample, digesting and measuring the mercury content. The mercury removal rates are listed in table 2.
Example 2
The polluted soil is taken from silt of a factory in Hebei, crushed stone impurities are removed, the soil is dried and sieved by a 50-mesh sieve, and the mercury-polluted soil to be repaired is obtained and contains 133mg/kg of mercury.
The composition and the content of each component of the soil washing composition for removing mercury are shown in table 1, wherein the mass ratio of cysteine to biosurfactant is 4.5: 10.
and adding water to dissolve the soil leaching composition for removing mercury and diluting to 1600g to obtain the composite leaching agent. And filling 250g of the soil sample of the mercury-polluted soil to be repaired into a leaching column, leaching the mercury-polluted soil to be repaired by adopting 1300g of the composite leaching agent at a leaching rate of 2mL/min, taking the soil sample after leaching, drying, digesting and measuring the mercury content. The mercury removal rates are listed in table 2.
Example 3
The polluted soil is taken from silt of a factory in Hebei, crushed stone impurities are removed, the soil is dried and sieved by a 50-mesh sieve, and the mercury-polluted soil to be repaired is obtained and contains 133mg/kg of mercury.
The composition and the content of each component of the soil washing composition for removing mercury are shown in table 1, wherein the mass ratio of cysteine to biosurfactant is 1: 2.
and adding water to dissolve the soil leaching composition for removing mercury and diluting to 1600g to obtain the composite leaching agent. And filling 250g of the soil sample of the mercury-contaminated soil to be repaired into a leaching column, leaching the mercury-contaminated soil to be repaired at a leaching rate of 1.9mL/min by adopting 1350g of the composite leaching agent, leaching the mercury-contaminated soil to be repaired, taking the soil sample after leaching, drying, digesting and measuring the mercury content. The mercury removal rates are listed in table 2.
Example 4
The polluted soil is taken from silt of a factory in Hebei, crushed stone impurities are removed, the soil is dried and sieved by a 50-mesh sieve, and the mercury-polluted soil to be repaired is obtained and contains 133mg/kg of mercury.
The composition and the content of each component of the soil washing composition for removing mercury are shown in table 1, wherein the mass ratio of cysteine to biosurfactant is 15: 32.
And adding water to dissolve the soil leaching composition for removing mercury and diluting to 1600g to obtain the composite leaching agent. And filling 250g of the soil sample of the mercury-contaminated soil to be repaired into a leaching column, leaching the mercury-contaminated soil to be repaired at a leaching rate of 2.1mL/min by using 1400g of the composite leaching agent, leaching the mercury-contaminated soil to be repaired, drying the soil sample after leaching, digesting and measuring the mercury content. The mercury removal rates are listed in table 2.
Example 5
The polluted soil is taken from silt of a factory in Hebei, crushed stone impurities are removed, the soil is dried and sieved by a 50-mesh sieve, and the mercury-polluted soil to be repaired is obtained and contains 133mg/kg of mercury.
The composition and the content of each component of the soil washing composition for removing mercury are shown in table 1, wherein the mass ratio of cysteine to biosurfactant is 1: 2.
And adding water to dissolve the soil leaching composition for removing mercury and diluting to 1600g to obtain the composite leaching agent. And filling 250g of the soil sample of the mercury-polluted soil to be repaired into a leaching column, leaching the mercury-polluted soil to be repaired at a leaching rate of 2.2mL/min by adopting 1500g of the composite leaching agent, leaching the mercury-polluted soil to be repaired, taking the soil sample after leaching, drying, digesting and measuring the mercury content. The mercury removal rates are listed in table 2.
Example 6
The polluted soil is taken from silt of a factory in Hebei, crushed stone impurities are removed, the soil is dried and sieved by a 50-mesh sieve, and the mercury-polluted soil to be repaired is obtained and contains 133mg/kg of mercury.
The composition and the content of each component of the soil washing composition for removing mercury are shown in table 1, wherein the mass ratio of cysteine to biosurfactant is 1: 32.
And adding water to dissolve the soil leaching composition for removing mercury and diluting to 1600g to obtain the composite leaching agent. And filling 250g of the soil sample of the mercury-contaminated soil to be repaired into a leaching column, leaching the mercury-contaminated soil to be repaired by adopting 1500g of the composite leaching agent at a leaching rate of 2mL/min, taking the soil sample after leaching, drying, digesting and measuring the mercury content. The mercury removal rates are listed in table 2.
Example 7
The polluted soil is taken from silt of a factory in Hebei, crushed stone impurities are removed, the soil is dried and sieved by a 50-mesh sieve, and the mercury-polluted soil to be repaired is obtained and contains 133mg/kg of mercury.
The composition and the content of each component of the soil washing composition for removing mercury are shown in table 1, wherein the mass ratio of cysteine to biosurfactant is 1: 4.
And adding water to dissolve the soil leaching composition for removing mercury and diluting to 1600g to obtain the composite leaching agent. And filling 250g of the soil sample of the mercury-contaminated soil to be repaired into a leaching column, leaching the mercury-contaminated soil to be repaired at a leaching rate of 2.2mL/min by using 1400g of the composite leaching agent, leaching the mercury-contaminated soil to be repaired, drying the soil sample after leaching, digesting and measuring the mercury content. The mercury removal rates are listed in table 2.
Comparative example 1
The polluted soil is taken from silt of a factory in Hebei, crushed stone impurities are removed, the soil is dried and sieved by a 50-mesh sieve, and the mercury-polluted soil to be repaired is obtained and contains 133mg/kg of mercury.
The composition and the content of each component of the soil eluting agent for removing mercury are shown in table 1, using only cysteine.
And (3) adding water to the soil eluting agent for removing mercury to dissolve and dilute the soil eluting agent to 1600g to obtain the eluting agent. And filling 250g of the soil sample of the mercury-contaminated soil to be repaired into a leaching column, leaching the mercury-contaminated soil to be repaired at a leaching rate of 2mL/min by adopting 1500g of leaching agent, taking the soil sample after leaching, drying, digesting and measuring the mercury content. The mercury removal rates are listed in table 2.
Comparative example 2
The polluted soil is taken from silt of a factory in Hebei, crushed stone impurities are removed, the soil is dried and sieved by a 50-mesh sieve, and the mercury-polluted soil to be repaired is obtained and contains 133mg/kg of mercury.
The composition and the content of each component of the soil eluting agent for removing mercury are shown in table 1, and only biosurfactant is used.
And (3) adding water to the soil eluting agent for removing mercury to dissolve and dilute the soil eluting agent to 1600g to obtain the eluting agent. And filling 250g of the soil sample of the mercury-contaminated soil to be repaired into a leaching column, leaching the mercury-contaminated soil to be repaired at a leaching rate of 2mL/min by adopting 1500g of leaching agent, taking the soil sample after leaching, drying, digesting and measuring the mercury content. The mercury removal rates are listed in table 2.
TABLE 1
As can be seen from the results of table 2, the soil washing composition for removing mercury provided by the present invention has high mercury removal efficiency. In addition, the components in the soil leaching composition for removing mercury provided by the invention are environment-friendly, and the problem that the treatment efficiency and the environment friendliness of the mercury-polluted soil leaching agent in the prior art cannot be considered at the same time can be solved by adopting the soil leaching composition for removing mercury provided by the invention.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A soil washing composition for removing mercury, the composition comprising: cysteine and biosurfactants;
wherein the mass ratio of the cysteine to the biosurfactant is (0.3-8): 10.
2. the soil washing composition for mercury removal according to claim 1, wherein the mass ratio of cysteine to biosurfactant is (1-8): 10, preferably (4-5): 10.
3. the soil washing composition for mercury removal according to claim 1 or 2, wherein the biosurfactant is selected from one or more of sophorolipids, rhamnolipids, algal glycolipids, iturins and camellin.
4. Use of a soil washing composition for mercury removal according to any one of claims 1 to 3 for remediation of mercury contaminated soil.
5. A method of remediating soil, the method comprising: repairing mercury contaminated soil to be repaired using the soil washing composition for mercury removal according to any one of claims 1 to 3.
6. The method of claim 5, wherein the method comprises: and leaching the mercury-contaminated soil to be repaired by using an eluent containing the soil leaching composition for removing mercury.
7. A method according to claim 6, wherein the concentration of the soil leaching composition for mercury removal in the leaching agent is 2-3.6 wt%, preferably 2.8-3 wt%.
8. The method according to claim 6, wherein the weight ratio of the eluting agent to the mercury-contaminated soil to be remediated is (2-10): 1, preferably (5-6): 1.
9. the method according to any of claims 6-8, wherein the elution rate is 1-3mL/min, preferably 1.8-2.2 mL/min.
10. The method according to any one of claims 5 to 9, wherein the mercury-contaminated soil to be remediated contains mercury.
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Citations (3)
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| US20110033913A1 (en) * | 2008-04-07 | 2011-02-10 | Giuseppina Bestetti | Method and apparatus for themicrobiological removal of mercury from contaminated materials, |
| CN106958153A (en) * | 2017-03-17 | 2017-07-18 | 苏州经贸职业技术学院 | A kind of compound textile auxiliary and its preparation technology |
| CN110305668A (en) * | 2019-04-11 | 2019-10-08 | 苏州市宏宇环境科技股份有限公司 | Heavy metals in paddy soils eluent and preparation method thereof |
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- 2019-10-22 CN CN201911007004.1A patent/CN112694892B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110033913A1 (en) * | 2008-04-07 | 2011-02-10 | Giuseppina Bestetti | Method and apparatus for themicrobiological removal of mercury from contaminated materials, |
| CN106958153A (en) * | 2017-03-17 | 2017-07-18 | 苏州经贸职业技术学院 | A kind of compound textile auxiliary and its preparation technology |
| CN110305668A (en) * | 2019-04-11 | 2019-10-08 | 苏州市宏宇环境科技股份有限公司 | Heavy metals in paddy soils eluent and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| 王秀玲: "《环境化学》", 30 September 2013, 华东理工大学出版社 * |
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