CN112940731A - Heavy metal composite pollution site treatment and restoration agent - Google Patents
Heavy metal composite pollution site treatment and restoration agent Download PDFInfo
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- CN112940731A CN112940731A CN202110069091.4A CN202110069091A CN112940731A CN 112940731 A CN112940731 A CN 112940731A CN 202110069091 A CN202110069091 A CN 202110069091A CN 112940731 A CN112940731 A CN 112940731A
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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
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a heavy metal composite pollution site treatment and restoration agent, which comprises the following components, by weight, 10-50% of calcium carbonate powder, 10-50% of humic acid raw ore powder and 5-30% of ferrous sulfate; the agent is used for treating the pollution of heavy metals cadmium, arsenic, lead and chromium in soil.
Description
Technical Field
The invention belongs to the field of soil remediation, and particularly relates to a heavy metal composite contaminated site treatment and remediation agent
Background
Soil is the material foundation on which humans and other organisms live, and plays an important role in maintaining the balance of the ecosystem. When the content of some metal elements in the soil exceeds the standard value of the heavy metal content of the soil in China or is obviously higher than the natural background value of the soil, the phenomenon of causing the deterioration of the ecological environment is called soil heavy metal pollution. The pollution sources of heavy metals (Pb, Cd, etc.) in soil are wide, and the pollution sources and the distribution characteristics can be mainly divided into natural factors and human factors. Under natural conditions, soil heavy metals mainly come from matrix of the soil and other biological substances brought by natural physical and chemical migration, and the low content of the heavy metals has no obvious influence on the ecological system and the health of human beings and other organisms; however, under unnatural conditions, the influence degree of human activities on the heavy metal content in soil exceeds the action of natural factors, and the soil is a main source of heavy metal pollution of soil, wherein industrial and mining production, atmospheric sedimentation, sewage irrigation, application of agricultural chemical fertilizers and the like are main factors causing the Pb and Cd content in soil to exceed the standard.
The remediation principle of the heavy metal pollution of the soil mainly comprises two principles, namely, the occurrence form of the heavy metal in the soil is changed through the actions of adsorption, complexation, precipitation, coordination, oxidation reduction and the like, and the biological effectiveness of the heavy metal in the soil is reduced; and secondly, the heavy metal is thoroughly removed from the polluted soil. The contaminated soil remediation methods can thus be broadly divided into physical remediation, biological remediation and chemical remediation. In recent years, heavy metal pollution events such as cadmium rice, lead poison and the like caused by soil pollution problems are commonly reported, and the soil heavy metal, especially the common lead and cadmium pollution problems are more and more concerned. The search for a scientific, reasonable and efficient method for treating the heavy metal pollution of the soil becomes a very urgent task.
Disclosure of Invention
The invention aims to provide a remediation agent for heavy metal content in soil, aiming at the defects of the prior art.
In order to achieve the aim, the heavy metal composite pollution site treatment and restoration agent adopts the following technical scheme:
a heavy metal composite pollution site treatment and restoration agent comprises, by weight, 10-50% of calcium carbonate powder, 10-50% of humic acid raw ore powder and 5-30% of ferrous sulfate.
As a better embodiment, the heavy metal composite pollution site treatment and restoration agent comprises 40% of calcium carbonate powder, 40% of humic acid raw ore powder and 20% of ferrous sulfate.
As a better embodiment, in the heavy metal composite pollution site treatment and remediation agent, the particle sizes of calcium carbonate powder and humic acid raw ore powder are 500-100 meshes;
as a preferred embodiment, the particle size of the calcium carbonate powder and the raw humic acid mineral powder is preferably 800 meshes.
The invention also aims to provide the application of the heavy metal composite pollution site treatment and remediation agent in treating soil heavy metal pollution.
In a preferred embodiment, the heavy metal is cadmium, arsenic, lead or chromium.
As a preferred embodiment, the heavy metal is arsenic or cadmium.
Compared with the prior art, the invention has the following beneficial effects:
after the calcium carbonate, the humic acid and the ferrous sulfate are used in a combined manner, the content of the As in the soil in the effective state is remarkably reduced, the content of the As in the soil in the effective state is only 1.94mg/kg, and the reduction rate is 69.88%; in addition, after the calcium carbonate, the humic acid and the ferrous sulfate are used in combination, the content of the As in the soil in the effective state is remarkably reduced, the content of the As in the soil in the effective state is only 0.405mg/kg, and the reduction rate is 22.12%.
Detailed Description
The invention will be better understood from the following examples. However, those skilled in the art will readily appreciate that the description of the embodiments is only for illustrating the present invention and should not be taken as limiting the invention as detailed in the claims.
Example 1: influence of different treatments on the content of As and Cd in the soil in the available state
The tested soil is collected from a certain farmland base of the research institute of subtropical crops in the autonomous region of Zhuang nationality in Guangxi province. Sampling plough layer with depth of 0-25cm, air drying to remove impurities, and sieving with 20 mesh sieve. The total cadmium of the soil to be tested is 0.215mg/kg, and the total arsenic is 10.2 mg/kg.
Preparing polluted soil: weighing 100g of soil, and spraying 5ml of 0.05g/L CdCl2Mixing well, spraying 5mL of 0.80g/L Na3AsO45mL of distilled water is sprayed on the solution, the water content is adjusted to 10-15% (w/w), the solution is uniformly mixed, the total cadmium in the soil reaches 1.8mg/kg, the total arsenic reaches 40mg/kg, then the prepared polluted soil is respectively placed in 200mL wide-mouth plastic bottles, and the soil is balanced for 15 days in a constant-temperature intelligent incubator at the temperature of (25 +/-1) ° C. Adding into polluted soil according to the formula in the table 1; each treatment was repeated 3 times. Fully and uniformly mixing 0.5% of fixing agent and 99.5% of soil, sealing with kraft paper to keep ventilation, culturing in a constant-temperature intelligent incubator at the temperature of (25 +/-1) DEG C, and supplementing deionized water to the soil by a weighing method every other day to keep constant water content. And (5) sampling after culturing for 28 days, and determining the pH value, the Cation Exchange Capacity (CEC), the organic carbon content and the contents of available Cd and As of the soil sample.
TABLE 1 formulation
The determination method comprises the following steps: the total arsenic in soil is measured by adopting a microwave digestion method to digest (nitric acid and hydrochloric acid), and the effective As is dissolved by 0.5mol/L NaHCO3And measuring As in the leaching solution, the digestion solution and the leaching liquor by using an atomic fluorescence spectrophotometer. The total cadmium is digested by a microwave digestion method (nitric acid, hydrochloric acid and hydrofluoric acid), and the effective state Cd of the soil is 0.005mol/LDTPA-0.1 mol/LTEA-0.01 mol/LCaCl2The leaching method comprises the step of measuring Cd in digestion liquid and leaching liquor by using an inductively coupled plasma mass spectrometer.
And (3) measuring results:
TABLE 2 Effect of different treatments on As content in soil in the available State
As can be seen from table 2, the treatments of formulas 1-5 significantly reduced the content of As in the soil available state by 69.88%, 34.01%, 40.99%, 46.43% and 29.81%, respectively, As compared to the control. Compared with the formula 2-4, after the calcium carbonate, the humic acid and the ferrous sulfate are used in combination, the content of the As in the soil in the effective state is remarkably reduced, and the content of the As in the soil in the effective state is only 1.94 mg/kg.
Table 3: influence of different treatments on Cd content in soil in effective state
As can be seen from Table 3, the treatment of formulations 1-5 significantly reduced the content of As in the soil in the available state by 22.12%, 9.23%, 2.31%, 5.00%, and 6.54%, respectively, As compared to the control. Compared with the formula 2-4, after the calcium carbonate, the humic acid and the ferrous sulfate are used in combination, the content of the As in the soil in the effective state is remarkably reduced, and the content of the As in the soil in the effective state is only 0.405 mg/kg.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that modifications may be made without departing from the invention as claimed in the invention and these modifications are within the scope of the invention.
Claims (6)
1. The heavy metal composite pollution site treatment and restoration agent is characterized in that: comprises the following components, by weight, 10-50% of calcium carbonate powder, 10-50% of humic acid raw ore powder and 5-30% of ferrous sulfate.
2. The heavy metal composite polluted site treatment and remediation agent as claimed in claim 1, wherein the calcium carbonate powder is 40%, the humic acid raw ore powder is 40%, and the ferrous sulfate is 20%.
3. The heavy metal composite polluted site treatment and remediation agent of claim 1 or 2, wherein the heavy metal composite polluted site treatment and remediation agent is a heavy metal composite polluted site treatment and remediation agent; the particle sizes of the calcium carbonate powder and the humic acid raw ore powder are 500-100 meshes; preferably 800 mesh.
4. Use of the heavy metal complex contaminated site remediation agent of any one of claims 1-3 for remediation of soil heavy metal contamination.
5. Use according to claim 4, characterized in that the heavy metals are cadmium, arsenic, lead, chromium; preferred heavy metals are arsenic, cadmium.
6. Use according to claim 4, characterized in that the medicament is used in an amount of 0.1-1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110069091.4A CN112940731A (en) | 2021-01-19 | 2021-01-19 | Heavy metal composite pollution site treatment and restoration agent |
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| CN202110069091.4A CN112940731A (en) | 2021-01-19 | 2021-01-19 | Heavy metal composite pollution site treatment and restoration agent |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575011A (en) * | 2020-05-22 | 2020-08-25 | 赛恩斯环保股份有限公司 | Heavy metal contaminated soil composite remediation agent and application method thereof |
| CN111944538A (en) * | 2020-09-21 | 2020-11-17 | 湖南凯迪工程科技有限公司 | Stabilizer for repairing soil cadmium, lead and arsenic combined pollution and preparation method thereof |
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2021
- 2021-01-19 CN CN202110069091.4A patent/CN112940731A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575011A (en) * | 2020-05-22 | 2020-08-25 | 赛恩斯环保股份有限公司 | Heavy metal contaminated soil composite remediation agent and application method thereof |
| CN111944538A (en) * | 2020-09-21 | 2020-11-17 | 湖南凯迪工程科技有限公司 | Stabilizer for repairing soil cadmium, lead and arsenic combined pollution and preparation method thereof |
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Application publication date: 20210611 |
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