CN110681687A - Neutral soil heavy metal cleaning agent and cleaning method thereof - Google Patents
Neutral soil heavy metal cleaning agent and cleaning method thereof Download PDFInfo
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- CN110681687A CN110681687A CN201810734871.4A CN201810734871A CN110681687A CN 110681687 A CN110681687 A CN 110681687A CN 201810734871 A CN201810734871 A CN 201810734871A CN 110681687 A CN110681687 A CN 110681687A
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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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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses a neutral soil heavy metal cleaning agent, which comprises: 1 molar unit of aqueous solvent; a solute dissolved in the water solvent, wherein the solute is at least one salt compound, and 0.01-1.8 mol of solute is dissolved in 1 mol of water solvent, so that when the solute dissolved in the water solvent contacts polluted soil containing heavy metals, the heavy metals can be separated from the polluted soil. The invention also discloses a cleaning method by using the neutral soil heavy metal cleaning agent.
Description
Technical Field
The invention relates to a neutral soil heavy metal cleaning agent and a cleaning method by using the neutral soil heavy metal cleaning agent.
Background
The pollutants generated by human activities and industrialization not only affect the balance of the natural environment, but also indirectly affect the health of human beings and natural organisms. For the pollution of soil, the health of natural organisms is damaged, the growth and the health of crops are further reduced, and the human health is particularly influenced. For soil pollution, the soil pollution can be mainly divided into organic pollution and heavy metal pollution; for organic contamination, whether pesticides or oil stains, it is now possible to remove them effectively, for example by enzymatic decomposition, microbial decomposition, or by surfactant binding. However, for heavy metal pollution in soil, although many researchers have proposed many treatment techniques, there remain relative disadvantages.
The conventional solidification method (solidification) is to solidify the contaminated soil through a solidifying agent, thereby limiting the movement and diffusion of the contaminants. The fixed soil condensate can be removed and buried, or can be directly solidified in the field; the disadvantage is that the waste is discarded in the form of solidified material, not only occupying space, but also the occupied space can not be used for cultivation or for the recycling of natural environment. In the case of the Stabilization method, harmful components in soil or waste are chemically treated by chemical agents to make them harmless or unable to release, but the treatment is generally carried out as industrial waste, which is not only expensive but also risks recontamination.
Similarly, a method called Vitrification (vitrifying) method is a method that can selectively pass through high temperature heating, and the resistance of the soil polluted by metal is low, and the soil is transformed into high temperature after being charged with a large amount of electric energy, so that the soil is vitrified by mistake, besides no curing agent is needed to be added, the volume and the surface area of the soil solidified by Vitrification method are smaller, the possibility of releasing pollutants can be reduced, and the soil can be treated to the polluted soil in the deep layer of more than 20 feet underground. Similarly, the treated soil has a large amount of solidified materials, and thus it is difficult to perform cultivation or reuse the soil as a natural environment.
In addition, there are techniques for separation, concentration and decontamination, such as thermal desorption for mercury; or the pollution is removed by a leaching (SoilWashing) or acid washing method, and the part needs to be cleaned by clean water, organic solvent or acid according to different components of the pollutants. For example, lead can be independently leached by clean water and separated by gravity, but the method consumes a large amount of water due to repeated rinsing, relatively limits the types of pollutants capable of being treated and the amount of soil capable of being treated, but has the advantage that the treated soil can be smoothly backfilled for reuse; the type, composition and particle size of the soil can also affect the leaching effect. Even though the leached soil can be backfilled to the original position, the sludge containing a high proportion of heavy metals needs to be further treated or discarded according to the properties of the sludge. And the gravity leaching method alone is mostly only suitable for heavy metals with larger molecular weight, which also becomes a limit of leaching technology.
Similar to those in the leaching arts, there are also acid (base) washing methods, the main difference being that the acid washing method is to separate heavy metals using aqueous solutions such as dilute hydrochloric acid, phosphoric acid, acetic acid, etc. as cleaning agents. In contrast, acid (alkaline) washing techniques separate the smaller molecular weight heavy metals in the soil more readily than washing, and can achieve removal efficiencies of about 50% as described in the aforementioned mainland chinese patent. On the one hand, however, the pickling requires a plurality of washing cycles, and generates a large amount of waste liquid. According to the record of Chinese patent CN103357655A, the soil of acid washing technology: the water ratio is 1: 15; in other words, washing 10 tons of soil uses up to 100 tons of acid wash. After the separation step, the implementation of the pickling technique will further treat the sludge together with the pickling aqueous solution, and a large amount of heat energy will be generated in the process.
Further disadvantageously, the acid residue of the soil after acid washing treatment must be subjected to post-treatment steps such as neutralization/stabilization before backfilling. In addition, because the soil is washed by aqueous solutions such as acid and alkali, the original characteristics of the soil are seriously damaged, and even if the soil is backfilled, natural organisms and microorganisms still have adaptation problems. In addition, the waste liquid, whether the waste liquid is acid-washed or post-treated, needs to be treated additionally to be safely discarded; meanwhile, the technology can cause great safety hazards to the environment and personnel.
In short, in the existing heavy metal contaminated soil treatment technology, the solidification/stabilization method and the vitrification method occupy the treatment space or are forced to abandon the land for reuse; on the other hand, although the existing cleaning technology or acid washing technology can backfill soil for use, on one hand, the efficiency of removing heavy metal pollution still has room for improvement, and the washing process is complicated, especially a large amount of waste liquid and sludge are produced, the natural utilization capacity of the soil is damaged in the acid washing process, and the room for improvement is still left in all aspects.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is desirable to provide a neutral soil heavy metal cleaning agent according to the embodiments of the present invention, which is aimed at achieving the following objectives: (1) heavy metals are removed through neutral salt compounds, so that the damage to soil is reduced, and the effect of environmental friendliness is achieved; (2) the heavy metal is removed by taking the neutral salt compound as a solute, so that the safety hazard to the working environment and personnel in the working process is reduced; (3) by using the neutral salt compound as the solute, the removal efficiency is better than that of acid washing, and the method is not limited to heavy metals with high molecular weight.
According to the embodiments of the present invention, it is also desirable to provide a soil cleaning method using a neutral soil heavy metal cleaning agent, which aims to achieve the following objects: (1) by using choline salicylate as solute, soil nutrition is increased during cleaning, and anti-inflammatory component can be provided in future crops, which is helpful for future planting or cultivation; (2) the soil polluted by heavy metal is cleaned by using the neutral salt compound as a solute, so that the process can be simplified, the subsequent treatment of waste liquid can be simplified, and the decontamination cost can be greatly reduced; (3) by using the neutral salt compound as the solute, the aqueous solution after being applied can be recycled and reused instead of being used as waste liquid, thereby greatly reducing the subsequent treatment cost; (4) by using the neutral salt compound as the solute, less cleaning agent can be used than acid (alkali) cleaning, so as to achieve the purposes of environmental protection and reducing the use cost of the cleaning agent.
According to the embodiment, the invention provides a neutral soil heavy metal cleaning agent, which comprises:
1 molar unit of aqueous solvent;
a solute dissolved in the water solvent, wherein the solute is at least one salt compound, and 0.01-1.8 mol of solute is dissolved in 1 mol of water solvent, so that when the solute dissolved in the water solvent contacts polluted soil containing heavy metals, the heavy metals can be separated from the polluted soil.
According to the embodiment, the soil cleaning method using the neutral soil heavy metal cleaning agent provided by the invention comprises the following steps:
(a) providing 1 unit weight of contaminated soil;
(b) providing 2 to 15 unit weight of a neutral soil heavy metal cleaner for mixing with the contaminated soil for at least 30 minutes, wherein the neutral soil heavy metal cleaner comprises:
1 molar unit of aqueous solvent;
a solute dissolved in the aqueous solvent, the solute being at least one salt compound, and 0.01 to 1.8 mol of the solute being dissolved in 1 mol of the aqueous solvent, such that: when a solute dissolved in an aqueous solvent contacts contaminated soil containing heavy metals, the heavy metals can be separated from the contaminated soil to produce a contaminated fraction;
(c) filtering out the neutral soil heavy metal cleaning agent and the polluted part.
Compared with the prior art, the neutral soil heavy metal cleaning agent and the soil cleaning method using the same provided by the invention have the advantages that the neutral salt compound is used as the solute, so that the processing procedure can be simplified, the operation cost can be reduced, the waste liquid can be reduced, the removal efficiency is better than that of an acid (alkali) washing technology, the burden or safety hazard of the cleaning to the environment and related operators can be reduced, and meanwhile, the nutrition of the soil can be increased, so that the planting and the cultivation are facilitated; meanwhile, the aqueous solution after being applied can be recycled, thereby further achieving the purposes of environmental protection and cost reduction. Of course, the neutral salt compound as a solute is not limited to being dissolved in water after being combined into a single compound, and may be a neutral soil heavy metal cleaning agent formed by adding an aqueous solution of an acidic compound and an aqueous solution of a basic compound to each other.
Drawings
FIG. 1 is a flow chart showing the steps of a first preferred embodiment of the present invention (for explaining the preparation and cleaning method of the neutral soil heavy metal cleaner in this embodiment).
FIG. 2 is a schematic diagram of the operation of the embodiment of FIG. 1.
FIG. 3 is a flow chart showing the steps of a second preferred embodiment of the present invention (for explaining the neutral soil heavy metal cleaning agent, its preparation, cleaning and recovery method).
Fig. 4 is an operational schematic diagram of the embodiment of fig. 3.
FIG. 5 is a schematic diagram illustrating the operation of recovering the neutral heavy metal detergent in the embodiment of FIG. 3.
Wherein: 21 is a water pipe; 22. 42 and 54 are neutral soil heavy metal cleaning agents; 23. 43 is contaminated soil; 24 is a dripping groove; 25 is a receiving barrel; 26 is an aqueous solution doped with heavy metal ions; 41 is supernatant water solution; 44 is a barrel; a dc power supply; 52 is an anode electrode; 53 is a cathode electrode; 55 is an electroplating bath; 91. 92, 93 are first embodiment steps; 91 ', 921 ', 92 ', 93 ', 94 ' are second embodiment steps.
Detailed Description
The foregoing and other features, aspects and utilities of the present general inventive concept will be apparent from the following detailed description of the presently preferred embodiments, read in conjunction with the accompanying drawings; moreover, in the various embodiments, like components will be referred to by like reference numerals.
First preferred embodiment
The first preferred embodiment of the present invention, as shown in fig. 1 and 2, is an aqueous solution with choline salicylate as solute and a cleaning method thereof. In this example, the formulation is shown with 1 mole ratio of aqueous solvent to 1.8 mole ratio of choline salicylate as the salt compound. When the choline salicylate is dissolved in the hydrosolvent to form the aqueous solution, the pH value of the aqueous solution is between 6.0 and 6.5, so that the aqueous solution is used as a neutral soil heavy metal cleaning agent.
However, if one or more of 1, 3-dimethyl imidazolium iodide, 1-dimethyl piperidine, tetramethylamine cation or tetramethylphosphate is used as a positive ion, the following negative ions correspond to the following: [ AlCl ]4]-、[FeCl4]-、[AlBr]-、[FeBr]-、[CuBr]-、[ZnBr]-、[Al2Cl7]-、[Al3Cl10]-、[Al(Et)Cl3]-、[Al(OCH2CF3)4]-、Cl-、Br-、I-、[N3]-、[SCN]-、[OCN]-、[N(CN)2]-、[C(CN)3]-、[B(CN)4]-、[BF4]-、[B(oxalato)2]-、[B(C6H44-CF3)4]-、[PF6]-、[P(C2F5)3F3]-、[SbF6]-、[NO3]-、[NO2]-、[ROSO3]-、[(RO)2PO2]-、[MeCO2]-、[CF3CO2]-、[lactate]-、[amino acidate]-、[p-MeC6H4SO3]-、[CF3SO3]-、[(CF3SO2)2N]-、Na2EDTA、Na4IDS, sodium salicylate, sodium gluconate, sodium oxalate, sodium citrate and amino sodium triacetate, and the salt compound is dissolved in the hydrosolvent to prepare the neutral soil heavy metal cleaning agent, which does not influence the aim of the invention.
In this example, step 91 provides 1 unit by weight of contaminated soil, which is a total of 10 kg of soil 23 from zinc (Zn) and copper (Cu) contaminated farmland; step 92, providing 2 weight units of neutral soil heavy metal cleaning agent 22 corresponding to 10 kilograms of 1 polluted soil and 20 kilograms of 1 polluted soil from a water pipe 21, and placing the neutral soil heavy metal cleaning agent and the neutral soil heavy metal cleaning agent together in a dripping tank 24, wherein the dosage of the neutral soil heavy metal cleaning agent is far less than that of the cleaning agent in the acid washing technology described in Chinese patent CN 103357655A; next, at step 92, the neutral soil heavy metal detergent 22 corresponding to 2 weight units is mixed with the contaminated soil 23 by continuous stirring for 30 minutes. Of course, as one skilled in the art will readily appreciate, mixing as a drum or mixing followed by standing is part of the mixing.
When the contaminated soil 23 is mixed with the neutral soil heavy metal cleaning agent 22, the positive ions in the neutral soil heavy metal cleaning agent can replace the zinc ions and the copper ions in the contaminated soil, so that the zinc ions and the copper ions are separated from the contaminated soil 23; the separated zinc ions and copper ions enter the aqueous solution of the neutral soil heavy metal cleaning agent to become polluted aqueous solution.
Finally, the water solution 26 mixed with heavy metal ions is received by the receiving barrel 25 below in a screen mesh manner in the step 93, and the cleaned soil is left, so that the soil can be backfilled to the originally polluted farmland and can be used for cultivation or planting, and the effect of cleaning the soil is achieved; therefore, the subsequent neutralization/stabilization process in the acid washing technology is omitted, the neutral soil heavy metal cleaning agent still maintains neutrality after cleaning, and the whole operation process can not cause the burden of the environment and workers. Of course, those skilled in the art can easily understand that the effect of the present invention is not affected if the cleaning agent and the contaminated part of the neutral soil heavy metal are removed by extraction or dumping.
The content of zinc ions in the soil cleaned by the present embodiment is reduced from 1344ppm to 589ppm, and the rate of separating heavy metal zinc ions from the soil is about 56% as the removal efficiency. In addition, the experiment tests show that the neutral soil heavy metal cleaning agent reduces the content of copper (Cu) polluted soil from 1959ppm to 762ppm compared with the original content of copper ions, and the removal efficiency after cleaning can reach about 61 percent respectively. Also higher than the removal efficiency of the acid washing technology described in Chinese patent CN 103357655A.
Second preferred embodiment
In a second preferred embodiment of the present invention, choline chloride is used as the positive ion, corresponding to the following negative ions: [ AlCl ]4]-、[FeCl4]-、[AlBr]-、[FeBr]-、[CuBr]-、[ZnBr]-、[Al2Cl7]-、[Al3Cl10]-、[Al(Et)Cl3]-、[Al(OCH2CF3)4]-、Cl-、Br-、I-、[N3]-、[SCN]-、[OCN]-、[N(CN)2]-、[C(CN)3]-、[B(CN)4]-、[BF4]-、[B(oxalato)2]-、[B(C6H44-CF3)4]-、[PF6]-、[P(C2F5)3F3]-、[SbF6]-、[NO3]-、[NO2]-、[ROSO3]-、[(RO)2PO2]-、[MeCO2]-、[CF3CO2]-、[lactate]-、[amino acidate]-、[p-MeC6H4SO3]-、[CF3SO3]-、[(CF3SO2)2N]-、Na2EDTA、Na4IDS, sodium salicylate, sodium gluconate, sodium oxalate, sodium citrate and amino sodium triacetate, wherein the salt compound is 0.01 mol, and is correspondingly dissolved in an aqueous solution formed by 1 mol of a water solvent to serve as the neutral soil metal cleaning agent in the embodiment, and the pH value of the neutral soil metal cleaning agent is between 6.0 and 6.5.
Referring to fig. 3 and 4 together, in this embodiment, in step 91 ', a contaminated soil containing 2013ppm copper metal and 1276ppm zinc metal is provided at 10 kg, and then in step 921', impurities in the soil are removed through a mesh device with different mesh sizes; however, as can be easily understood by those skilled in the art, the method of removing stones, dead branches, leaves, other types of waste, etc. with larger particles in the soil, such as removing impurities in the soil by a sorting method, can be applied to the present invention without affecting the implementation thereof; the polluted soil after the impurities are removed can be more thoroughly mixed with the neutral soil heavy metal cleaning agent.
Subsequently, step 92' provides 2 times the weight of the neutral soil heavy metal detergent, 30 kg total of the neutral soil heavy metal detergent 42, and mixes with the contaminated soil 43 in the barrel 44 for at least 2 hours, wherein the standing and the precipitation are included for 30 minutes; then, step 93' is performed to mix the supernatant water solution 41 after being filtered and stirred by the sun exposure in a pumping manner, wherein the supernatant water solution comprises the neutral soil heavy metal cleaning agent 42 and heavy metal pollutants mainly comprising copper ions. Furthermore, in this embodiment, the cation choline chloride used in the neutral soil heavy metal cleaning agent 42 is a precursor of the biosynthetic vitamin B, so that after cleaning, when the positive ions replace the positively charged heavy metal ions in the polluted soil, the nutrient content of the soil can be increased, and the growth of plants and microorganisms planted or cultivated later can be facilitated.
Experimental tests show that the copper content of the cleaned polluted soil is 750ppm and the zinc content of the cleaned polluted soil is 673ppm, and the removal efficiencies of about 56 percent and 48 percent are respectively achieved. In addition, copper ions are heavy metal ions lighter than lead ions, and are also heavy metal pollution which cannot be removed by a leaching process; of course, it can be easily understood by those skilled in the art that the rinsing process is used as the mixing process in the present embodiment, and the concept of the present invention is not affected. In particular, although the embodiment is shown as stirring and standing in a mixing tank, in practice, the operation can be performed in situ even in contaminated fields, that is, only a region of soil is dug on site, the neutral soil heavy metal cleaning agent is directly poured into the soil, after being uniformly stirred for a sufficient time, standing is performed, and the supernatant solution 41 is taken out, so that all steps of removing heavy metal ions contamination can be completed by solarization in situ, and the soil purification effect can be achieved.
Finally, step 94' is recovered after extraction; the recovered soil heavy metal cleaning agent containing the polluted part can be reused, and the supernatant water solution can be stored in a chemical liquid storage container and used for carrying out secondary or more repeated cleaning. According to experimental tests, the recovered soil heavy metal cleaning agent is directly used for cleaning copper (Cu)3477ppm, zinc (Zn)2023ppm, chromium (Cr)72ppm and nickel (Ni)54ppm for the second time, and after the cleaning is finished, the heavy metal content is reduced to copper (Cu)1612ppm, zinc (Zn)1101ppm, (Cr)41ppm and nickel (Ni)26 ppm; the cleaning efficiency can still reach the removal efficiency of 54%, 50%, 43% and 52% respectively.
As shown in FIG. 5, the recovered neutral soil heavy metal cleaner 54 can be placed in a plating tank 55 to recover copper ions by plating, for example, the cathode 53 is made of stainless steel, the anode 52 is made of platinum-titanium mesh, and the DC power supply 51 applies electric energy to the cathode 53, so that the copper ions in the neutral soil heavy metal cleaner 54 are plated on the cathode 53, and the neutral soil heavy metal cleaner 54 can be cleaned and reused. Similarly, one skilled in the art can easily precipitate heavy metal ions by, for example, acid-base reaction without changing the essence of the present invention. Therefore, the neutral soil heavy metal cleaning agent can be repeatedly utilized for several times to lose the activity, and the heavy metal ions can be effectively recovered, so that the waste generated by the soil cleaning method is greatly reduced.
Of course, it will be readily understood by those skilled in the art that the neutral soil heavy metal cleaner may further comprise a chelating agent of at least one selected from ethylenediaminetetraacetic acid, aminocarboxylates, iminodisuccinic acid, tmdtta, DE, ethylenediaminedisuccinic acid, and diethyltriaminepentaacetic acid, which is exemplified by tmdtta. However, it is also readily understood by those skilled in the art that the chelating agent may also be used as an anion or cation in a neutral soil heavy metal cleaning agent, and does not affect the essence of the present invention.
In addition, it can be easily understood by those skilled in the art that the neutral detergent in the present invention can be formed by mixing the acidic salt compound and the basic salt compound into aqueous solutions without pre-combination and then mixing them together, for example, a neutral detergent in which oxalic acid (oxalic acid) is used as the acidic solute (pH 1) and sodium nitrilotriacetate (Na3NTA) is used as the basic solute (pH 12.5). The concentration ranges from 1.8 moles to 0.005 moles.
According to experimental tests, the heavy metal content of the polluted soil before cleaning originally is 804ppm of copper (Cu), 951ppm of zinc (Zn), 432ppm of chromium (Cr) and 490ppm of nickel (Ni), and after cleaning by using a neutral cleaning agent, the heavy metal content is reduced to 353ppm of chromium copper (Cu), 534ppm of zinc (Zn), (245 ppm of Cr) and 283ppm of nickel (Ni); the cleaning efficiency is respectively 56%, 44%, 42% and 42%, the effect of removing heavy metals in the soil is completely achieved, the neutrality of the pH value of the soil is still maintained, and the difficulty of soil cleaning and the cost of soil cleaning are greatly reduced.
Claims (9)
1. The neutral soil heavy metal cleaning agent is characterized by comprising the following components in parts by weight:
1 molar unit of aqueous solvent;
a solute dissolved in the water solvent, wherein the solute is at least one salt compound, and 0.01-1.8 mol of the solute is dissolved in the 1 mol of the water solvent, so that when the solute dissolved in the water solvent contacts polluted soil containing heavy metals, the heavy metals can be separated from the polluted soil.
2. The neutral soil heavy metal cleaner as claimed in claim 1, wherein the salt compound is formed by at least one positive ion corresponding to at least one negative ion; the positive ion is selected from 1, 3-dimethyl imidazolium iodide, 1-dimethyl piperidine, tetramethylamine cation and tetramethylphosphate; the negative ions are selected from AlCl4]-、[FeCl4]-、[AlBr]-、[FeBr]-、[CuBr]-、[ZnBr]-、[Al2Cl7]-、[Al3Cl10]-、[Al(Et)Cl3]-、[Al(OCH2CF3)4]-、Cl-、Br-、I-、[N3]-、[SCN]-、[OCN]-、[N(CN)2]-、[C(CN)3]-、[B(CN)4]-、[BF4]-、[B(oxalato)2]-、[B(C6H44-CF3)4]-、[PF6]-、[P(C2F5)3F3]-、[SbF6]-、[NO3]-、[NO2]-、[ROSO3]-、[(RO)2PO2]-、[MeCO2]-、[CF3CO2]-、[lactate]-、[amino acidate]-、[p-MeC6H4SO3]-、[CF3SO3]-、[(CF3SO2)2N]-、Na2EDTA、Na4IDS, sodium salicylate, sodium gluconate, sodium oxalate, sodium citrate, and sodium aminotriacetate.
3. The neutral soil heavy metal cleaner of claim 1, further comprising a chelating agent.
4. A neutral soil heavy metal cleaner as defined in claim 3 wherein the chelating agent is selected from the group consisting of ethylenediaminetetraacetic acid, aminocarboxylates, iminodisuccinic acid, TMDTA, DE, ethylenediaminedisuccinic acid and diethyltriaminepentaacetic acid.
5. A neutral soil heavy metal cleaner as claimed in claim 2, 3 or 4, wherein said salt compound has a cation comprising at least choline chloride.
6. A soil cleaning method by using a neutral soil heavy metal cleaning agent is characterized by comprising the following steps:
(a) providing 1 unit weight of contaminated soil;
(b) providing 2 to 15 unit weight of a neutral soil heavy metal cleaner for mixing with the contaminated soil for at least 30 minutes, wherein the neutral soil heavy metal cleaner comprises:
1 molar unit of aqueous solvent;
a solute dissolved in the water solvent, the solute being at least one salt compound, and 0.01 to 1.8 mol of the solute being dissolved in the 1 mol unit water solvent such that: when the aforementioned solute dissolved in the aqueous solvent contacts the contaminated soil containing the heavy metal, the heavy metal can be separated from the contaminated soil to produce a contaminated portion;
(c) filtering out the neutral soil heavy metal cleaning agent and the polluted part.
7. The soil cleaning method using neutral soil heavy metal detergent as claimed in claim 6, wherein there is a step (b-1) between the step (a) and the step (b): removing impurities in the polluted soil.
8. The soil washing method using neutral soil heavy metal detergent as claimed in claim 6 or 7, further comprising the following steps after step (c):
(d) collecting the filtered neutral soil heavy metal cleaning agent and the polluted part;
(e) and recovering the neutral soil heavy metal cleaning agent.
9. The method for cleaning soil using neutral soil heavy metal detergent according to claim 8, wherein the recovering in the step (e) is electroplating recovering, whereby the contaminated part is separated from the neutral soil heavy metal detergent.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810734871.4A CN110681687A (en) | 2018-07-06 | 2018-07-06 | Neutral soil heavy metal cleaning agent and cleaning method thereof |
| TW108123718A TW202006143A (en) | 2018-07-06 | 2019-07-05 | Neutral soil heavy metal detergent and cleaning method thereof using a neutral salt compound to separate heavy metals from the contaminated soil |
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| CN201810734871.4A CN110681687A (en) | 2018-07-06 | 2018-07-06 | Neutral soil heavy metal cleaning agent and cleaning method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023244198A1 (en) * | 2022-06-14 | 2023-12-21 | Akpinar Aysegul | An efficient, sustainable and economical method for reducing heavy metal accumulation and eliminating heavy metal toxicity in plants |
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| TWI754452B (en) * | 2020-11-13 | 2022-02-01 | 煒業中央投資有限公司 | Intelligent processing system for removing harmful heavy metal substances in pollutants |
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| CN101879521A (en) * | 2010-06-11 | 2010-11-10 | 中国地质大学（北京） | Method for remedying arsenic polluted soil |
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| CN103320139A (en) * | 2013-06-09 | 2013-09-25 | 沈阳大学 | Environment-friendly eluent for treating heavy-metal-polluted soil |
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