CN111842445A - In-situ extraction and remediation method for heavy metal contaminated soil - Google Patents
In-situ extraction and remediation method for heavy metal contaminated soil Download PDFInfo
- Publication number
- CN111842445A CN111842445A CN202010664708.2A CN202010664708A CN111842445A CN 111842445 A CN111842445 A CN 111842445A CN 202010664708 A CN202010664708 A CN 202010664708A CN 111842445 A CN111842445 A CN 111842445A
- Authority
- CN
- China
- Prior art keywords
- remediation
- soil
- heavy metal
- repairing
- metal contaminated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses an in-situ extraction and remediation method for heavy metal contaminated soil, and belongs to the field of soil remediation. According to the in-situ extraction and remediation method for the heavy metal contaminated soil, the remediation agent is placed in a remediation device made of polytetrafluoroethylene and then is put into the soil, in the soil remediation process, the remediation agent adsorbs precious metals in the soil, the remediation device can protect the remediation agent from being damaged, meanwhile, the remediation agent is more concentrated, the adsorption range is expanded, and the adsorption performance is improved; on the other hand, the repairing agent is arranged in the repairing device and is convenient to recycle. The method has the advantages of simple operation, easy large-area implementation, no secondary pollution, low maintenance cost, and capability of adsorbing a large amount of noble metals in soil and reducing soil pollution.
Description
Technical Field
The invention belongs to the field of soil remediation, and particularly relates to an in-situ extraction and remediation method for heavy metal contaminated soil.
Background
The soil pollution is continuously increased along with the development of science and technology. In the aspect of mining area land, along with the continuous excavation of mineral resources, the mining area polluted soil is more serious. According to the investigation result: the mine pollution standard exceeding point accounts for 33.4%, and the main pollutants are cadmium, lead, arsenic and polycyclic aromatic hydrocarbon. The pollution of cadmium, arsenic, lead and the like of the soil around the nonferrous metal mining area is serious. At present, the soil pollution condition is limited by conditions of climate and soil type, different pollution characteristics are presented, and the pollution is easy, the repair is difficult, the investment is large, and the effect is slow due to the characteristics of the soil.
The conventional method only controls and converts the heavy metals in the soil, and if the heavy metals in the soil can be reused, the conventional method is a great resource. Therefore, how to solve the problems of low cost, high efficiency, simple operation, capability of treating compound polluted soil, no secondary pollution, capability of recovering heavy metals and the like is imperative to realize the soil heavy metal remediation system.
Disclosure of Invention
The invention aims to overcome the defect that the existing soil remediation method is easy to generate secondary pollution, and provides an in-situ extraction remediation method for heavy metal contaminated soil.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
an in-situ extraction and remediation method for heavy metal contaminated soil comprises the following steps:
1) putting the repairing agent into a repairing device, and then putting the repairing agent into soil to be repaired;
taking zeolite, bentonite or corn straws as raw materials, and granulating to obtain particles which are used as a repairing agent;
the repairing device is a hollow sphere which is made of high polymer materials and can be opened and closed, and a plurality of holes communicated with the inside of the sphere are distributed on the sphere;
the aperture of the holes is larger than the particle size of the particles;
2) and after the preset time for repairing, taking out the repairing devices distributed in the soil.
Further, in the step 1), the throwing depth is 0-50 cm.
Furthermore, the small holes are uniformly distributed on the ball body.
Further, the following operations are also included after the step 2):
and taking out the repairing agent and eluting the heavy metal.
Further, the prosthetic device is made of polytetrafluoroethylene.
Further, the particle size of the particles is 8 mm;
the aperture of the holes is 5 mm.
Compared with the prior art, the invention has the following beneficial effects:
according to the in-situ extraction and remediation method for the heavy metal contaminated soil, the remediation agent is placed in a remediation device made of polytetrafluoroethylene and then is put into the soil, in the soil remediation process, the remediation agent adsorbs precious metals in the soil, the remediation device can protect the remediation agent from being damaged, meanwhile, the remediation agent is more concentrated, the adsorption range is expanded, and the adsorption performance is improved; on the other hand, the repairing agent is arranged in the repairing device and is convenient to recycle. The method has the advantages of simple operation, easy large-area implementation, no secondary pollution, low maintenance cost, and capability of adsorbing a large amount of noble metals in soil and reducing soil pollution.
Furthermore, the repairing agent is taken out, the heavy metal is eluted, the repairing agent can be reused, and the eluted heavy metal can be separated and recycled.
Detailed Description
Technical solutions in embodiments of the present invention are clearly and completely described in order to enable those skilled in the art to better understand the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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 protection scope of the present invention.
It is noted that the terms first, second and the like in the description and in the claims of the present invention are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
(1) Preparation of a repair agent
Mixing natural zeolite with water, putting into a granulator to prepare particles with the particle size of 8mm, and drying the particles at 60 ℃ for 24 h;
(2) remediation of heavy metal contaminated soil
a. The soil to be tested is cadmium-polluted soil
b. Applying a repairing agent: weighing 7g of repairing agent, putting into a repairing device, putting the repairing device into soil with the depth of 0-50cm, keeping the water content of the soil at 65%, and putting for 2, 4, 6 and 8 days.
c. And (3) recovering: and taking out the repairing agent in the repairing device, digesting the collected sample, drying, grinding and sieving the soil sample.
Weighing 0.25g of soil sample, putting the soil sample into a digestion tube, adding 10mL of nitric acid and 4mL of hydrofluoric acid, soaking for 12h at room temperature, then heating to 120 ℃ for soaking for 1h, then heating to 150 ℃ for soaking for 2h, then heating to 175 ℃, then slowly cooling, uncovering, acid removing, constant volume and filtering, and finally determining the content of the adsorbed cadmium.
d. And (3) regeneration and utilization: and eluting the heavy metal from the repairing agent, and using the heavy metal as the repairing agent again to realize efficient continuous repairing.
TABLE 1 change of cadmium content
| Time interval | Content (mg/kg) |
| 0 | 7.61 |
| 2 | 7.88 |
| 4 | 7.80 |
| 6 | 8.61 |
| 8 | 8.34 |
As can be seen from table 1, the embodiment is restoreed heavy metal contaminated soil effect and is showing, and it is seen that through putting into prosthetic devices with the prosthetic agents and distributing in soil, the effectual absorption that has strengthened the Cd element, measures the discovery, places the increase of heavy metal concentration around the prosthetic devices, explains that the prosthetic devices who is equipped with the prosthetic agents have absorbent effect to heavy metal, can adsorb heavy metal from soil, has greatly improved heavy metal contaminated soil's remediation efficiency.
Example 2
(1) Preparation of a repair agent
Uniformly mixing bentonite and water, putting the mixture into a granulator to prepare particles with the particle size of 10mm, and drying the particles at 50 ℃ for 24 hours to serve as a repairing agent;
(2) remediation of heavy metal contaminated soil
Filling the repairing agent into a repairing device, and putting the repairing agent into soil; the prosthetic devices are hollow spheres, holes with the diameter of 6mm are evenly distributed on the spheres, the holes are communicated with the inner hollow space, and the prosthetic devices can be opened and closed.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. The in-situ extraction and remediation method for the heavy metal contaminated soil is characterized by comprising the following steps:
1) putting the repairing agent into a repairing device, and then putting the repairing agent into soil to be repaired;
taking zeolite, bentonite or corn straws as raw materials, and granulating to obtain particles which are used as a repairing agent;
the repairing device is a hollow sphere which is made of high polymer materials and can be opened and closed, and a plurality of holes communicated with the inside of the sphere are distributed on the sphere;
The aperture of the holes is larger than the particle size of the particles;
2) and after the preset time for repairing, taking out the repairing devices distributed in the soil.
2. The in-situ extraction and remediation method for heavy metal contaminated soil according to claim 1, wherein in the step 1), the putting depth is 0-50 cm.
3. The in-situ extraction and remediation method for heavy metal contaminated soil according to claim 1, wherein the small holes are uniformly distributed on the sphere.
4. The in-situ extraction and remediation method for heavy metal contaminated soil according to claim 1, wherein the step 2) is followed by the following steps:
and taking out the repairing agent and eluting the heavy metal.
5. The in-situ extraction and remediation method for heavy metal contaminated soil according to claim 1, wherein the remediation device is made of polytetrafluoroethylene.
6. The in-situ extraction and remediation method for heavy metal contaminated soil according to claim 1, wherein the particle size of the particulate matter is 8 mm;
the aperture of the holes is 5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664708.2A CN111842445B (en) | 2020-07-10 | 2020-07-10 | In-situ extraction and remediation method for heavy metal contaminated soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664708.2A CN111842445B (en) | 2020-07-10 | 2020-07-10 | In-situ extraction and remediation method for heavy metal contaminated soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111842445A true CN111842445A (en) | 2020-10-30 |
| CN111842445B CN111842445B (en) | 2022-06-17 |
Family
ID=72984021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010664708.2A Active CN111842445B (en) | 2020-07-10 | 2020-07-10 | In-situ extraction and remediation method for heavy metal contaminated soil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111842445B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264981A (en) * | 2008-04-15 | 2008-09-17 | 华东师范大学 | Stair device used for river water body ecological restoring |
| CN102923798A (en) * | 2012-11-08 | 2013-02-13 | 中国环境科学研究院 | Device and method for repairing underground water ammonia nitrogen pollution in normal position and abnormal position combined mode |
| CN104743667A (en) * | 2015-03-13 | 2015-07-01 | 环境保护部环境规划院 | Device for in-situ remediation of underground water pollution of agricultural irrigator well and method for remediation of underground water by using device |
| CN110373205A (en) * | 2019-06-20 | 2019-10-25 | 安徽壹陆红现代农业科技有限公司 | A kind of preparation method of high concentration cobalt, lead contamination soil soil-repairing agent |
-
2020
- 2020-07-10 CN CN202010664708.2A patent/CN111842445B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264981A (en) * | 2008-04-15 | 2008-09-17 | 华东师范大学 | Stair device used for river water body ecological restoring |
| CN102923798A (en) * | 2012-11-08 | 2013-02-13 | 中国环境科学研究院 | Device and method for repairing underground water ammonia nitrogen pollution in normal position and abnormal position combined mode |
| CN104743667A (en) * | 2015-03-13 | 2015-07-01 | 环境保护部环境规划院 | Device for in-situ remediation of underground water pollution of agricultural irrigator well and method for remediation of underground water by using device |
| CN110373205A (en) * | 2019-06-20 | 2019-10-25 | 安徽壹陆红现代农业科技有限公司 | A kind of preparation method of high concentration cobalt, lead contamination soil soil-repairing agent |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111842445B (en) | 2022-06-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104941583B (en) | A kind of cadmium arsenic adsorbent material, Preparation method and use | |
| Chen et al. | Adsorption of cadmium by biochar derived from municipal sewage sludge: impact factors and adsorption mechanism | |
| Nithya et al. | Packed bed column optimization and modeling studies for removal of chromium ions using chemically modified Lantana camara adsorbent | |
| Long et al. | Packed bed column studies on lead (II) removal from industrial wastewater by modified Agaricus bisporus | |
| Fernández-González et al. | Effective removal of zinc from industrial plating wastewater using hydrolyzed olive cake: Scale-up and preparation of zinc-Based biochar | |
| CN110699084B (en) | Soil heavy metal pollution curing and repairing composite reagent and curing and repairing method | |
| CN105131960A (en) | Preparation method and application of lead-polluted soil restoration material | |
| CN107185491A (en) | A kind of modification biological Carbon Materials and preparation method and application | |
| CN110624506B (en) | Method for preparing water purifying agent by utilizing coal gasification furnace slag and obtained water purifying agent | |
| CN103623782A (en) | Preparation method for composite magnetic adsorption material and method for removing heavy metal ions in waste water | |
| CN109622581B (en) | Method for removing heavy metals in polluted soil by using magnetically modified biochar | |
| CN105618472A (en) | Method for removing effective-state heavy metal in heavy metal contaminated soil permanently | |
| CN108188162B (en) | Method for treating heavily polluted land | |
| Shanmugaprakash et al. | Batch and fixed-bed column studies for biosorption of Zn (II) ions onto pongamia oil cake (Pongamia pinnata) from biodiesel oil extraction | |
| CN108114974B (en) | Method for repairing cadmium-polycyclic aromatic hydrocarbon composite polluted soil | |
| CN111704905A (en) | Soil remediation agent and preparation method and application thereof | |
| CN112076727A (en) | Heavy metal pollution repairing agent and preparation method thereof | |
| CN111570494A (en) | Heavy metal contaminated soil remediation method | |
| CN106166473B (en) | Method for preparing adsorbent by using non-metal separators in waste circuit boards | |
| CN111842445B (en) | In-situ extraction and remediation method for heavy metal contaminated soil | |
| Adetoro et al. | Adsorption and desorption studies of Carica papaya stem activated with zinc chloride for mining wastewater treatment | |
| CN111922070B (en) | Floating material, heavy metal contaminated soil remediation method based on floating material and application | |
| CN106367076A (en) | Preparation method of organic-inorganic composite heavy metal contaminated soil passivator | |
| CN107824609A (en) | One heavy metal species soil-repairing agent and preparation method and application | |
| CN111575016B (en) | Heavy metal contaminated soil remediation material and preparation method and application method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |