CN110076183B - Heavy metal polluted mine soil remediation method - Google Patents
Heavy metal polluted mine soil remediation method Download PDFInfo
- Publication number
- CN110076183B CN110076183B CN201910396943.3A CN201910396943A CN110076183B CN 110076183 B CN110076183 B CN 110076183B CN 201910396943 A CN201910396943 A CN 201910396943A CN 110076183 B CN110076183 B CN 110076183B
- Authority
- CN
- China
- Prior art keywords
- electrodes
- modified montmorillonite
- heavy metal
- montmorillonite
- soil
- 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.)
- Expired - Fee Related
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
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/062—Reclamation of contaminated soil thermally by using electrode or resistance heating elements
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a heavy metal contaminated mine soil remediation method, which comprises the following operation steps: (1) adding montmorillonite into buffer solution, dispersing uniformly by ultrasonic wave, adding sodium silicate, filtering to obtain precipitate, and drying the precipitate to obtain modified montmorillonite; (2) adding ferric chloride hexahydrate into ionized water, carrying out ultrasonic treatment, continuing to add ammonia water into the ionized water, heating, continuing to add sodium citrate into the ionized water, heating, carrying out heat preservation treatment, adding modified montmorillonite into the ionized water, and carrying out stirring reaction to obtain magnetic modified montmorillonite; (3) inserting a plurality of electrodes into soil, then embedding magnetic modified montmorillonite around the electrodes, electrifying the electrodes, extracting heavy metal pollutants in the soil through an extraction well, and then performing harmless treatment on the heavy metals. The method for restoring the heavy metal polluted mine soil has the advantages of short treatment period, high removal rate of target pollutants and deep restoration depth.
Description
Technical Field
The invention belongs to the technical field of soil remediation, and particularly relates to a heavy metal contaminated mine soil remediation method.
Background
As is known, mineral resources are one of the most basic resources for human production and life, heavy metal resources rich in mines are various in types, wide in distribution range and extremely rich in reserves, and although the development of the heavy metal resources in mines creates huge material wealth, a series of serious ecological environment pollution problems are caused due to unreasonable exploitation. Mining causes pollution of various heavy metals, and mining, selecting and smelting of metal mining all discharge heavy metal elements to the environment. For example, the heavy metal elements are introduced into the mine area by the waste sulfides produced during the mining of the primary sulfide deposits through long-term natural oxidation and rain leaching. In addition, weathering of solid waste can also cause leaching of heavy metal primary colors, particularly lead-zinc ores, lead, zinc, arsenic and accompanying components such as pickaxe, chromium and copper in surrounding rocks and tailings enter soil under leaching of rainwater and are accumulated in the process of mining and utilization.
The physical and chemical properties of most heavy metals are relatively stable, the heavy metals have weaker migration capacity, the heavy metals are easily adsorbed by particles in soil, the heavy metals cannot be degraded by microorganisms but are completely eliminated from the environment, the heavy metals can be directly accumulated in a food chain through plants when the content of the heavy metals is higher, extremely adverse effects are generated on soil conditions, crop growth environment, human body health and the like, in addition, the heavy metals can generate considerable toxic action on the plants when the heavy metals are accumulated to a certain degree, the metabolic process of the plants is disturbed, normal growth and development are inhibited, even a large-area death phenomenon occurs, and the crop yield is greatly reduced. Heavy metal pollution also affects the growth of microorganisms in the soil, reducing the activity and stability of the microorganisms in the soil.
Heavy metal pollution is not only shown in harm to crops and underground water systems, but also possibly enters human bodies through complicated food chains, so that the possibility of various complications is increased, and great harm is brought to human health.
The physiological mechanism that heavy metal pollution harms human health is mainly that heavy metal elements and protein and enzyme in a human body undergo chemical reaction, so that the protein and the enzyme lose activity, and the metabolic pathway and the physiological function of the human body are greatly changed. Heavy metal in some organs of a human body is enriched too much to exceed the tolerance limit of the human body, and various complications of acute poisoning, chronic poisoning and the like of the human body can be caused. For example, after eating mercury, the mercury can directly enter the liver of a human body, and the damage to the brain and the nervous system is extremely large; too high pick element can cause hypertension and even cardiovascular and cerebrovascular diseases; lead is the most toxic and discharged in heavy metal pollution, is difficult to completely eliminate as long as a little lead enters a human body, is easy to form typical blood lead syndrome and directly causes direct damage to human brain cells. Therefore, the remediation of heavy metal pollution in mines becomes an urgent and unpredictable problem.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for restoring heavy metal contaminated mine soil, which is mainly characterized in that magnetic modified montmorillonite with adsorption and conduction functions is added around an electrode, so that the effects of improving the extraction effect and the soil conductivity are achieved, and the effect of removing heavy metal contaminants in the soil is further effectively improved.
The invention is realized by the following technical scheme.
A heavy metal contaminated mine soil remediation method comprises the following operation steps:
(1) adding montmorillonite into buffer solution with pH value of 8-9, ultrasonically dispersing uniformly, adding sodium silicate, reacting for 3-4 hr, filtering to obtain precipitate, and drying the precipitate to obtain modified montmorillonite;
(2) adding 24-28 parts by weight of ferric chloride hexahydrate into 300 parts by weight of deionized water (250-300 parts), ultrasonically dispersing uniformly, continuing to add 35-40 parts of ammonia water, heating to 30-35 ℃, continuing to add sodium citrate, heating to 65-70 ℃, preserving heat for 2-3 hours to prepare ferroferric oxide, adding 75-80 parts of modified montmorillonite, stirring for reaction for 30-40min, filtering to obtain precipitate, and drying the precipitate to obtain magnetic modified montmorillonite;
(3) inserting a plurality of electrodes into soil, then embedding magnetic modified montmorillonite around the electrodes, electrifying the electrodes, extracting heavy metal pollutants in the soil through an extraction well, and then performing harmless treatment on the heavy metals.
Specifically, in the step (1), the buffer solution is prepared by using 0.1mol/L disodium hydrogen phosphate and 0.1mol/L sodium dihydrogen phosphate according to the volume ratio of 1: 1, and the pH value of the buffer solution is adjusted to 8-9 by using a sodium hydroxide solution.
Specifically, in the step (1), the adding mass ratio of the montmorillonite to the sodium silicate is 10: 1-3.
Specifically, in the step (2), the addition amount of the sodium citrate is 3% of the mass of the deionized water.
Specifically, in the step (2), before adding ammonia water, nitrogen is introduced for 15min under mechanical stirring to remove oxygen in the solution after ultrasonic dispersion.
Specifically, in the step (3), the linear distance between the electrodes is equal and is 1.0-1.5m, and the depth of the electrode insertion is 8-10 m.
Specifically, in the step (3), the addition amount of the magnetic modified montmorillonite is as follows: 1kg of magnetic modified montmorillonite was added around each electrode.
Specifically, the electrifying time of the electrode is 12-14 hours per day, the electrifying days are 30 days, and the magnetic modified montmorillonite is added every 10 days.
Specifically, the number of extraction wells is half of the number of electrodes.
According to the technical scheme, the beneficial effects of the invention are as follows:
the method for restoring the heavy metal polluted mine soil has the advantages of short treatment period, high removal rate of target pollutants and deep restoration depth. According to the invention, the montmorillonite is added, so that the montmorillonite can well adsorb and gather heavy metal pollutants in the polluted soil, the heating effect of the electrode on the heavy metal pollutants is further improved, and the removal rate and the removal speed of the heavy metal pollutants are finally improved; in the step (1), sodium silicate is used for modifying montmorillonite, and the prepared montmorillonite-sodium polysilicate mixture has excellent compatibility with heavy metal pollutants, so that the adsorption effect of montmorillonite on heavy metal pollutants can be further improved; in the step (2), the magnetic ferroferric oxide is added into the modified montmorillonite, so that the conductivity of the soil around the electrode can be effectively improved, the efficiency of converting electric energy into heat energy by the soil is effectively improved, the effect of heating the soil is effectively improved, meanwhile, the mobility of heavy metals in the soil is also improved, and the effect of removing heavy metal pollutants in the soil is further improved.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
A heavy metal contaminated mine soil remediation method comprises the following operation steps:
(1) adding montmorillonite into a buffer solution with the pH value of 8, uniformly dispersing by ultrasonic, adding sodium silicate into the buffer solution, reacting for 3 hours, filtering to obtain a precipitate, and drying the precipitate to obtain modified montmorillonite, wherein the buffer solution is prepared by 0.1mol/L disodium hydrogen phosphate and 0.1mol/L sodium dihydrogen phosphate according to the volume ratio of 1: 1, the pH value of the buffer solution is adjusted to 8 by adopting a sodium hydroxide solution, and the adding mass ratio of the montmorillonite to the sodium silicate is 10: 1;
(2) adding 24 parts by weight of ferric chloride hexahydrate into 250 parts by weight of deionized water, after uniform ultrasonic dispersion, introducing nitrogen for 15min under mechanical stirring to remove oxygen in the solution after ultrasonic dispersion, continuously adding 35 parts by weight of ammonia water into the solution, heating to 30 ℃, continuously adding sodium citrate with the mass of deionized water being 3%, then heating to 65 ℃, carrying out heat preservation treatment for 2 hours, then adding 75 parts by weight of modified montmorillonite into the solution, carrying out stirring reaction for 30min, filtering to obtain a precipitate, and drying the precipitate to obtain magnetic modified montmorillonite;
(3) inserting a plurality of electrodes into soil, enabling the linear distance between the electrodes to be equal and to be 1.0m, enabling the inserting depth of the electrodes to be 8m, then embedding 1kg of magnetic modified montmorillonite around the electrodes, electrifying the electrodes, extracting heavy metal pollutants in the soil through an extraction well, and then carrying out innocent treatment on the heavy metals, wherein the electrifying time of the electrodes every day is 12 hours, the electrifying days are 30 days, the magnetic modified montmorillonite is added again every 10 days, and the setting number of the extraction wells is one half of the number of the electrodes.
Example 2
A heavy metal contaminated mine soil remediation method comprises the following operation steps:
(1) adding montmorillonite into a buffer solution with the pH value of 8, uniformly dispersing by ultrasonic, adding sodium silicate into the buffer solution, reacting for 3.5 hours, filtering to obtain a precipitate, and drying the precipitate to obtain modified montmorillonite, wherein the buffer solution is prepared by 0.1mol/L disodium hydrogen phosphate and 0.1mol/L sodium dihydrogen phosphate according to the volume ratio of 1: 1, the pH value of the buffer solution is adjusted to 8 by adopting a sodium hydroxide solution, and the adding mass ratio of the montmorillonite to the sodium silicate is 10: 2;
(2) adding 26 parts by weight of ferric chloride hexahydrate into 280 parts by weight of deionized water, after uniform ultrasonic dispersion, introducing nitrogen for 15min under mechanical stirring to remove oxygen in the solution after ultrasonic dispersion, continuously adding 38 parts by weight of ammonia water into the solution, heating to 33 ℃, continuously adding sodium citrate with the mass of deionized water being 3%, then heating to 68 ℃, carrying out heat preservation treatment for 2.5 hours, then adding 78 parts by weight of modified montmorillonite into the solution, carrying out stirring reaction for 35min, filtering to obtain a precipitate, and drying the precipitate to obtain magnetic modified montmorillonite;
(3) inserting a plurality of electrodes into soil, enabling the linear distance between the electrodes to be equal and to be 1.3m, enabling the inserting depth of the electrodes to be 9m, then embedding 1kg of magnetic modified montmorillonite around the electrodes, electrifying the electrodes, extracting heavy metal pollutants in the soil through an extraction well, and then carrying out innocent treatment on the heavy metals, wherein the electrifying time of the electrodes every day is 13 hours, the electrifying days are 30 days, the magnetic modified montmorillonite is added again every 10 days, and the setting number of the extraction wells is one half of the number of the electrodes.
Example 3
A heavy metal contaminated mine soil remediation method comprises the following operation steps:
(1) adding montmorillonite into a buffer solution with the pH value of 9, uniformly dispersing by ultrasonic, adding sodium silicate into the buffer solution, reacting for 4 hours, filtering to obtain a precipitate, and drying the precipitate to obtain modified montmorillonite, wherein the buffer solution is prepared by 0.1mol/L disodium hydrogen phosphate and 0.1mol/L sodium dihydrogen phosphate according to the volume ratio of 1: 1, the pH value of the buffer solution is adjusted to 9 by adopting a sodium hydroxide solution, and the adding mass ratio of the montmorillonite to the sodium silicate is 10: 3;
(2) adding 28 parts by weight of ferric chloride hexahydrate into 300 parts by weight of deionized water, after uniform ultrasonic dispersion, introducing nitrogen for 15min under mechanical stirring to remove oxygen in the solution after ultrasonic dispersion, continuously adding 40 parts by weight of ammonia water into the solution, heating to 35 ℃, continuously adding sodium citrate with the mass of deionized water being 3%, then heating to 70 ℃, carrying out heat preservation treatment for 3 hours, then adding 80 parts by weight of modified montmorillonite into the solution, carrying out stirring reaction for 40min, filtering to obtain a precipitate, and drying the precipitate to obtain magnetic modified montmorillonite;
(3) inserting a plurality of electrodes into soil, enabling the linear distance between the electrodes to be equal and to be 1.5m, enabling the inserting depth of the electrodes to be 10m, then embedding 1kg of magnetic modified montmorillonite around the electrodes, electrifying the electrodes, extracting heavy metal pollutants in the soil through an extraction well, and then carrying out innocent treatment on the heavy metals, wherein the electrifying time of the electrodes every day is 14 hours, the electrifying days are 30 days, the magnetic modified montmorillonite is added again every 10 days, and the setting number of the extraction wells is one half of the number of the electrodes.
Comparative example 1
The montmorillonite used in step (2) is not modified by sodium silicate in step (1), and the rest of the operation steps are completely the same as those in example 1.
Comparative example 2
The modified montmorillonite prepared in the step (1) is directly added to the periphery of the electrode in the step (3) without being treated in the step (2), and the rest of the operation steps are completely the same as the embodiment 2.
Comparative example 3
In step (3), nothing was added around the electrode, and the remaining operation was exactly the same as in example 3.
The method of each example and the method of each comparative example are respectively used for repairing the land blocks polluted by heavy metal in the same area, the treatment effect is shown in the table 2,
TABLE 1 detection data of each pollutant in heavy metal contaminated soil before treatment
| Heavy metal elements | Maximum amount detected, mg/kg |
| Copper (Cu) | 748 |
| Zinc | 810 |
| Lead (II) | 670 |
| Chromium (III) | 20 |
TABLE 2 detection data of each pollutant in heavy metal contaminated soil after treatment
As can be seen from table 2, after the montmorillonite is treated by the sodium silicate, the montmorillonite has better adsorptivity to the heavy metal pollutants and has more obvious effect of removing the heavy metal pollutants; the addition of the magnetic ferroferric oxide effectively improves the conductivity of the soil and enhances the heated effect of the soil.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should understand that they can make various changes, modifications, additions and substitutions within the spirit and scope of the present invention.
Claims (9)
1. The heavy metal contaminated mine soil remediation method is characterized by comprising the following operation steps:
(1) adding montmorillonite into buffer solution with pH value of 8-9, ultrasonically dispersing uniformly, adding sodium silicate, reacting for 3-4 hr, filtering to obtain precipitate, and drying the precipitate to obtain modified montmorillonite;
(2) adding 24-28 parts by weight of ferric chloride hexahydrate into 300 parts by weight of deionized water (250-300 parts), ultrasonically dispersing uniformly, continuing to add 35-40 parts of ammonia water, heating to 30-35 ℃, continuing to add sodium citrate, heating to 65-70 ℃, preserving heat for 2-3 hours to prepare ferroferric oxide, adding 75-80 parts of modified montmorillonite, stirring for reaction for 30-40min, filtering to obtain precipitate, and drying the precipitate to obtain magnetic modified montmorillonite;
(3) inserting a plurality of electrodes into soil, then embedding magnetic modified montmorillonite around the electrodes, electrifying the electrodes, extracting heavy metals in the soil through an extraction well, and then performing harmless treatment on the heavy metals.
2. The method for remedying the mine soil contaminated with heavy metals according to claim 1, wherein the buffer solution is prepared by using 0.1mol/L disodium hydrogen phosphate and 0.1mol/L sodium dihydrogen phosphate in a volume ratio of 1: 1 in the step (1), and the pH value of the buffer solution is adjusted to 8 to 9 by using a sodium hydroxide solution.
3. The method for restoring mine soil polluted by heavy metal according to claim 1, wherein in the step (1), the addition mass ratio of the montmorillonite to the sodium silicate is 10: 1-3.
4. The method for restoring mine soil polluted by heavy metals according to claim 1, wherein in the step (2), the addition amount of the sodium citrate is 3% of the mass of the deionized water.
5. The method for restoring mine soil polluted by heavy metals according to claim 1, wherein in the step (2), before adding ammonia water, nitrogen is introduced for 15min under mechanical stirring to remove oxygen in the solution after ultrasonic dispersion.
6. The method for remedying the mine soil contaminated by heavy metals according to claim 1, wherein in the step (3), the linear distance between the electrodes is equal and is 1.0 to 1.5m, and the depth of the electrode insertion is 8 to 10 m.
7. The method for restoring mine soil polluted by heavy metal according to claim 6, wherein in the step (3), the addition amount of the magnetic modified montmorillonite is as follows: 1kg of magnetic modified montmorillonite was added around each electrode.
8. The method for restoring mine soil polluted by heavy metals according to claim 1, wherein the electrifying time of the electrode is 12-14 hours per day, the electrifying days are 30 days, and the magnetic modified montmorillonite is added again every 10 days.
9. The method for restoring mine soil polluted by heavy metals according to claim 1, wherein the number of the extraction wells is one half of the number of the electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910396943.3A CN110076183B (en) | 2019-05-01 | 2019-05-01 | Heavy metal polluted mine soil remediation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910396943.3A CN110076183B (en) | 2019-05-01 | 2019-05-01 | Heavy metal polluted mine soil remediation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110076183A CN110076183A (en) | 2019-08-02 |
| CN110076183B true CN110076183B (en) | 2021-06-04 |
Family
ID=67420030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910396943.3A Expired - Fee Related CN110076183B (en) | 2019-05-01 | 2019-05-01 | Heavy metal polluted mine soil remediation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110076183B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111589851B (en) * | 2020-04-27 | 2021-09-14 | 广西盎之然环保科技有限公司 | Parallel remediation method for heavy metal pollution of farmland |
| CN117417185A (en) * | 2023-10-23 | 2024-01-19 | 苏州佺和中谊新型材料科技有限公司 | Super-flat fine glazed tile and preparation process thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106076249A (en) * | 2016-06-13 | 2016-11-09 | 环境保护部南京环境科学研究所 | A kind of modified alta-mud prepares the method for heavy metal particles adsorbent |
| CN108080408A (en) * | 2017-12-28 | 2018-05-29 | 台州泰捷化工科技有限公司 | A kind of method of repairing heavy metal in soil pollution |
-
2019
- 2019-05-01 CN CN201910396943.3A patent/CN110076183B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106076249A (en) * | 2016-06-13 | 2016-11-09 | 环境保护部南京环境科学研究所 | A kind of modified alta-mud prepares the method for heavy metal particles adsorbent |
| CN108080408A (en) * | 2017-12-28 | 2018-05-29 | 台州泰捷化工科技有限公司 | A kind of method of repairing heavy metal in soil pollution |
Non-Patent Citations (1)
| Title |
|---|
| 永州铅锌矿尾渣形态特征及生态风险评价;彭晖冰;《中国优秀硕士学位论文全文数据库（电子期刊）》;20071115;第9-15页，第18-24页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110076183A (en) | 2019-08-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Lin et al. | Technologies for removing heavy metal from contaminated soils on farmland: A review | |
| Gong et al. | An overview of field-scale studies on remediation of soil contaminated with heavy metals and metalloids: Technical progress over the last decade | |
| Kikuchi et al. | Biological removal and recovery of toxic heavy metals in water environment | |
| Li et al. | Bioleaching of gold from waste printed circuit boards by Chromobacterium violaceum | |
| Jalali et al. | The role of microorganisms in mobilization and phytoextraction of rare earth elements: a review | |
| CN106147775B (en) | A kind of fixed renovation agent of biochemistry combined soil heavy metal pollution and application | |
| CN110076183B (en) | Heavy metal polluted mine soil remediation method | |
| CN107737803B (en) | Remediation method for farmland polluted by heavy metal cadmium | |
| Ramla et al. | The potential utilisation of indigenous South African grasses for acid mine drainage remediation | |
| Muddarisna et al. | Phytoremediation of mercury-contaminated soil using three wild plant species and its effect on maize growth | |
| Mir et al. | Review on phytoremediation: An ecofriendly and green technology for removal of heavy metals | |
| Di Gregorio et al. | Brassica juncea can improve selenite and selenate abatement in selenium contaminated soils through the aid of its rhizospheric bacterial population | |
| CN112970777A (en) | Method for strengthening copper pollution resistance of reed by using gas molecule NO | |
| Lai et al. | Mechanisms and Influencing Factors of Biomineralization Based Heavy Metal Remediation: a Review | |
| Chen et al. | The interplay between microalgae and toxic metal (loid) s: mechanisms and implications in AMD phycoremediation coupled with Fe/Mn mineralization | |
| Zaghloul et al. | Modern technologies in remediation of heavy metals in soils | |
| Vo et al. | Biomining for sustainable recovery of rare earth elements from mining waste: A comprehensive review | |
| CN110016345B (en) | Cadmium-reducing arsenic-stabilizing soil passivator and use method thereof | |
| Jena et al. | Heavy metals | |
| Rostami et al. | The effect of cow manure application on the distribution fractions of Fe, Mn and Zn in agricultural soils | |
| Xiao et al. | Biosolubilization of rock phosphates in a bioreactor using a microbial consortium from rhizospheric soils: An analysis of the microbial community and technical feasibility | |
| CN110028975B (en) | Ecological environment-friendly soil remediation agent | |
| CN113578943A (en) | Method for repairing lead-polluted soil by using microalgae-montmorillonite compound | |
| CN112547784A (en) | Method for repairing heavy metal contaminated soil by high-phosphorus-loading microalgae passivator | |
| Aldaini et al. | EVALUATION OF THE EFFICIENCY OF SOME MINERALOGICAL AND ORGANIC MATERIALS TO REMOVE SOME HEAVY METALS FROM CONTAMINATED SOIL |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210604 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |