CN112521949A - Heavy metal soil leaching composition containing organic acid, application thereof and heavy metal soil remediation method - Google Patents
Heavy metal soil leaching composition containing organic acid, application thereof and heavy metal soil remediation method Download PDFInfo
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- CN112521949A CN112521949A CN201910875477.7A CN201910875477A CN112521949A CN 112521949 A CN112521949 A CN 112521949A CN 201910875477 A CN201910875477 A CN 201910875477A CN 112521949 A CN112521949 A CN 112521949A
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- heavy metal
- organic acid
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- metal soil
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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
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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
Abstract
The invention relates to the field of heavy metal contaminated soil remediation, and discloses a heavy metal soil leaching composition containing organic acid, application thereof and a heavy metal soil remediation method, wherein the composition comprises the following components in parts by weight: the organic acid-based organic light-emitting diode comprises tween, organic phosphonate and organic acid, wherein the mass ratio of tween to organic phosphonate to organic acid is 0.5-10: 0.5-8: 1. the organic acid-containing heavy metal soil leaching composition provided by the invention can create a good leaching environment, is environment-friendly in components, and has high removal efficiency on heavy metals.
Description
Technical Field
The invention relates to the field of heavy metal contaminated soil remediation, in particular to a heavy metal soil leaching composition containing organic acid, application thereof and a heavy metal soil remediation method.
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.
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.
Disclosure of Invention
The invention provides a heavy metal soil leaching composition containing organic acid, application thereof and a heavy metal soil remediation method. The heavy metal soil leaching composition containing the organic acid provided by the invention can create a good leaching environment, is environment-friendly in components and high in removal efficiency of heavy metals.
The present invention provides in a first aspect an organic acid-containing heavy metal soil washing composition comprising: tween, organic phosphonic acid and organic acid, wherein the mass ratio of the Tween to the organic phosphonic acid to the organic acid is 0.5-10: 0.5-8: 1.
preferably, the mass ratio of the tween to the organic phosphonate to the organic acid is 3.5-5.5: 2-3.5: 1.
the second aspect of the invention provides application of the composition in repairing heavy metal soil. When the heavy metal soil leaching composition provided by the invention is used for repairing heavy metal soil, all bioavailable heavy metals are removed under the action of acid.
In a third aspect, the present invention provides a method for remediating heavy metal soil, including: the heavy metal soil leaching composition containing the organic acid is adopted to repair heavy metal soil to be repaired.
Preferably, the method comprises: and leaching the heavy metal soil to be repaired by adopting an eluent containing the heavy metal soil leaching composition containing the organic acid.
The heavy metal soil leaching composition containing the organic acid has a removing effect on all bioavailable heavy metals, and the composition provided by the invention has high removal efficiency on bioavailable heavy metals and is environment-friendly. In addition, the problem of difficult leaching of low-permeability soil can be solved, and the method is effective to both silt and clay.
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.
The inventor of the invention finds that the tween can create a good leaching environment in soil leaching, has the effects of solubilizing, increasing the flow, promoting ion exchange and the like, and can enhance the solubility of heavy metal pollutants in water in the process of research; the organic phosphonate can effectively prevent salt from precipitating in water, can prevent and treat the blockage of leaching solution in the environment of leached water and soil mixture, keeps leaching smooth, is beneficial to separating heavy metal from a soil structure, and accelerates the formation of soluble chelate; organic acids, on the one hand, regulate acidity and, on the other hand, can bind heavy metal ions as chelating agents. The three components can also play a synergistic role on the basis of independently playing roles.
The present invention provides in a first aspect an organic acid-containing heavy metal soil washing composition comprising: tween, organic phosphonate and organic acid;
the mass ratio of the tween to the organic phosphonate to the organic acid is 0.5-10: 0.5-8: 1.
the heavy metal soil leaching composition containing the organic acid solves the problem of difficulty in leaching low-permeability soil.
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. The heavy metal soil is soil polluted by heavy metals. The heavy metal contaminated soil contains heavy metals, has a large content application range and can exceed the control value of the construction land.
The heavy metal soil leaching composition containing the organic acid provided by the invention does not contain components which can destroy the soil environment, so that secondary pollution can not be caused when the heavy metal soil leaching composition is used for soil remediation.
Preferably, in the heavy metal soil leaching composition containing the organic acid, the mass ratio of the tween to the organic phosphonate to the organic acid is 3.5-5.5: 2-3.5: 1. that is, the content of tween is preferably 3.5 to 5.5 parts by weight, for example, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, 5.5 parts by weight, and any value within a range of any two of these points, based on 1 part by weight of the organic acid; the organic phosphonate is present in an amount of 2 to 3.5 parts by weight, for example, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, and any value within the range of any two of these points.
According to a preferred embodiment of the present invention, the tween is selected from at least one of tween 20, tween 21, tween 40 and tween 60.
According to a preferred embodiment of the invention, the organic phosphonate is selected from at least one of sodium aminotrimethylenephosphonate, sodium ethylenediaminetetramethylenephosphonate, sodium diethylenetriaminepentamethylenephosphonate and sodium hydroxyethylenediphosphonate.
According to a preferred embodiment of the present invention, the organic acid is at least one selected from the group consisting of oxalic acid, tartaric acid, citric acid and fulvic acid.
The second aspect of the invention provides the application of the composition in repairing heavy metal soil. The heavy metal soil leaching composition containing the organic acid is particularly suitable for repairing the soil polluted by the heavy metal.
In a third aspect, the present invention provides a method for remediating heavy metal soil, including: the heavy metal soil leaching composition containing the organic acid provided by the invention is used for repairing heavy metal soil to be repaired.
The inventor of the present invention needs to explain here that, when the heavy metal soil to be repaired is repaired by using the heavy metal soil leaching composition containing organic acid provided by the present invention, each component of the heavy metal soil leaching composition containing organic acid may be added to the heavy metal soil separately, or may be added to the soil together in a ratio. In any form, the above components are added to the soil, and the heavy metal soil to be remediated is considered to be remediated using the above heavy metal soil leaching composition containing an organic acid.
According to a specific embodiment of the present invention, the method comprises: and leaching the heavy metal soil to be repaired by adopting an eluent containing the heavy metal soil leaching composition containing the organic acid.
According to the method for remediating heavy metal soil provided by the present invention, preferably, the concentration of the composition in the eluent containing the organic acid-containing heavy metal soil leaching composition is 1 to 9.5 wt%, preferably 3.25 to 5 wt%, for example, 3.25 wt%, 4 wt%, 4.5 wt%, 5 wt%, and any value within the range of any two of these points. The solvent of the eluent containing the organic acid-containing heavy metal soil leaching composition may be water.
According to the method for restoring heavy metal soil provided by the invention, preferably, the weight ratio of the eluting agent containing the organic acid-containing heavy metal soil eluting composition to the heavy metal soil to be restored is 1-6: 1, preferably 4 to 5: 1.
according to the method for restoring the heavy metal soil provided by the invention, the leaching rate is preferably 1-3mL/min, and preferably 1.5-2 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.
The method provided by the invention is suitable for removing various heavy metals, preferably, the heavy metals are selected from at least one of copper, cadmium and lead elements. The heavy metal soil leaching composition provided by the invention is particularly suitable for removing heavy metal elements such as copper, cadmium and lead.
The present invention will be described in detail below by way of examples.
Taking silt from a certain factory, removing broken stone sundries, sieving with a 20-mesh sieve, and drying to obtain heavy metal soil to be repaired containing 4722mg/kg of copper, 161mg/kg of cadmium and 3903mg/kg of lead.
The content of heavy metals in the soil is measured by an atomic fluorescence analysis method.
Oxalic acid, tartaric acid, citric acid and fulvic acid were purchased from Saibo technologies, Inc. in Hubei; tween 20, tween 21, tween 40 and tween 60 were purchased from shanghai allied biotechnology limited; aminotrimethylene sodium phosphonate, ethylenediamine tetramethylene sodium phosphonate, diethylenetriamine pentamethylene sodium phosphonate and hydroxyethylidene sodium diphosphonate are available from Hubei Kyovich scientific and technological Limited.
Example 1
The composition and the content of each component of the organic acid-containing heavy metal soil leaching composition are shown in table 1.
And adding water to dissolve the heavy metal soil leaching composition containing the organic acid, and diluting to 600g to obtain the heavy metal soil composite leaching agent.
And filling 120g of the heavy metal soil sample to be repaired into a leaching column, controlling the leaching rate to be 1.5mL/min, leaching the heavy metal soil to be repaired by adopting 600g of the heavy metal soil composite leaching agent containing the organic acid, drying the soil sample after leaching, digesting and measuring the heavy metal content which is 661mg/kg of copper, 31.4mg/kg of cadmium and 582mg/kg of lead respectively. The heavy metal removal rates are listed in table 2.
Example 2
The method of example 1 was followed except that the composition and the contents of the components of the organic acid-containing heavy metal soil leaching composition were as shown in table 1. After leaching, the heavy metal content in the soil sample is as follows: 471mg/kg of copper, 30.3mg/kg of cadmium and 445mg/kg of lead. The heavy metal removal rates are listed in table 2.
Example 3
The method of example 1 was followed except that the composition and the contents of the components of the organic acid-containing heavy metal soil leaching composition were as shown in table 1. After leaching, the heavy metal content in the soil sample is as follows: 548mg/kg of copper, 27.2mg/kg of cadmium and 418mg/kg of lead. The heavy metal removal rates are listed in table 2.
Example 4
The method of example 1 was followed except that the composition and the contents of the components of the organic acid-containing heavy metal soil leaching composition were as shown in table 1. After leaching, the heavy metal content in the soil sample is as follows: 661mg/kg of copper, 23.7mg/kg of cadmium and 562mg/kg of lead. The heavy metal removal rates are listed in table 2.
Example 5
The method of example 1 was followed except that the composition and the contents of the components of the organic acid-containing heavy metal soil leaching composition were as shown in table 1. After leaching, the heavy metal content in the soil sample is as follows: 458mg/kg of copper, 29.3mg/kg of cadmium and 445mg/kg of lead. The heavy metal removal rates are listed in table 2.
Example 6
The method of example 1 was followed except that the composition and the contents of the components of the organic acid-containing heavy metal soil leaching composition were as shown in table 1. After leaching, the heavy metal content in the soil sample is as follows: 449mg/kg copper, 30.6mg/kg cadmium and 433mg/kg lead. The heavy metal removal rates are listed in table 2.
Example 7
The method of example 1 was followed except that the composition and the contents of the components of the organic acid-containing heavy metal soil leaching composition were as shown in table 1. After leaching, the heavy metal content in the soil sample is as follows: 501mg/kg of copper, 33.2mg/kg of cadmium and 457mg/kg of lead. The heavy metal removal rates are listed in table 2.
Example 8
The method of example 1 was followed except that the composition and the contents of the components of the organic acid-containing heavy metal soil leaching composition were as shown in table 1. After leaching, the heavy metal content in the soil sample is as follows: 987mg/kg of copper, 47.8mg/kg of cadmium and 785mg/kg of lead. The heavy metal removal rates are listed in table 2.
Example 9
The method of example 1 was followed except that the composition and the contents of the components of the organic acid-containing heavy metal soil leaching composition were as shown in table 1. After leaching, the heavy metal content in the soil sample is as follows: 826mg/kg of copper, 51.7mg/kg of cadmium and 968mg/kg of lead. The heavy metal removal rates are listed in table 2.
Comparative example 1
The method of example 1 was followed except that the composition and the contents of the components of the heavy metal soil washing composition were as shown in table 1. After leaching, the heavy metal content in the soil sample is as follows: 1265mg/kg of copper, 63.3mg/kg of cadmium and 1097mg/kg of lead. The heavy metal removal rates are listed in table 2.
Comparative example 2
The method of example 1 was followed except that the composition and the contents of the components of the heavy metal soil washing composition were as shown in table 1. After leaching, the heavy metal content in the soil sample is as follows: 1044mg/kg of copper, 82.9mg/kg of cadmium and 1233mg/kg of lead. The heavy metal removal rates are listed in table 2.
Comparative example 3
The method of example 1 was followed except that the composition and the contents of the components of the heavy metal soil washing composition were as shown in table 1. After leaching, the heavy metal content in the soil sample is as follows: copper 1332mg/kg, cadmium 62.1mg/kg, lead 785 mg/kg. The heavy metal removal rates are listed in table 2.
TABLE 1
Note: the amounts of the components in Table 1 are given in "grams".
TABLE 2
The results in table 2 show that the organic acid-containing heavy metal soil leaching composition provided by the invention has high removal efficiency on heavy metals, particularly has higher removal rate on copper, cadmium and lead, and is suitable for polluted soil with high copper, cadmium and lead contents.
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. An organic acid-containing heavy metal soil washing composition comprising: tween, organic phosphonates and organic acids;
the mass ratio of the tween to the organic phosphonate to the organic acid is 0.5-10: 0.5-8: 1.
2. the composition according to claim 1, wherein the mass ratio of tween, organic phosphonate and organic acid is 3.5-5.5: 2-3.5: 1.
3. the composition according to claim 1 or 2, wherein the tween is selected from at least one of tween 20, tween 21, tween 40 and tween 60.
4. The composition of claim 1 or 2, wherein the organic phosphonate is selected from at least one of sodium aminotrimethylenephosphonate, sodium ethylenediaminetetramethylenephosphonate, sodium diethylenetriaminepentamethylenephosphonate, and sodium hydroxyethylenediphosphonate.
5. The composition according to any one of claims 1 to 4, wherein the organic acid is selected from at least one of oxalic acid, tartaric acid, citric acid and fulvic acid.
6. Use of a composition according to any one of claims 1 to 5 for the remediation of heavy metal soils.
7. A method for restoring heavy metal soil, which comprises the following steps: the heavy metal soil to be remediated is remediated using the organic acid-containing heavy metal soil rinse composition of any one of claims 1 to 5.
8. The method of claim 7, wherein the method comprises: leaching the heavy metal soil to be repaired by adopting an eluent containing the heavy metal soil leaching composition containing organic acid;
preferably, the concentration of the composition in the eluting agent containing the heavy metal soil leaching composition is 1 to 9.5 wt%, preferably 3.25 to 5 wt%.
9. The method according to claim 8, wherein the weight ratio of the eluting agent containing the organic acid-containing heavy metal soil eluting composition to the heavy metal soil to be remediated is 1-6: 1, preferably 4 to 5: 1;
preferably, the elution rate is 1-3mL/min, preferably 1.5-2 mL/min.
10. The method according to claim 7, wherein the heavy metal soil to be repaired contains heavy metals, and the heavy metals are selected from at least one of copper, cadmium and lead elements.
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| CN114806585A (en) * | 2022-03-29 | 2022-07-29 | 湖州蔚复来为民环保科技有限公司 | Soil eluting agent, soil remediation method and method for preparing organic nutrient soil |
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Application publication date: 20210319 |