Repairing agent for repairing lead, arsenic and cadmium combined polluted soil and repairing method thereof

A technology for compound pollution and soil remediation, applied in the field of soil pollution remediation, can solve the problems of difficulty in remediation and dissolution of heavy metal contaminated soil, and achieve the effects of resource utilization, environmental risk reduction, and strong practicability.

Pending Publication Date: 2021-07-02
中铝环保节能集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For this reason, the present invention provides a kind of remediation agent and its remediation method for remediating lead, arsenic, cadmium composite polluted soil, to solve the problem of soil anion (arsenic) and cation (lead, cadmium) in the prior art due to remediation agent simultaneously repairing There are certain defects. It is difficult to remediate heavy metal-contaminated soil where anions and cations coexist. The main performance is that the anion (cation) ion is stable but the cation (anion) ion is dissolved

Method used

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  • Repairing agent for repairing lead, arsenic and cadmium combined polluted soil and repairing method thereof
  • Repairing agent for repairing lead, arsenic and cadmium combined polluted soil and repairing method thereof
  • Repairing agent for repairing lead, arsenic and cadmium combined polluted soil and repairing method thereof

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Embodiment 1

[0036] This embodiment is a repairing agent for repairing lead, arsenic and cadmium composite polluted soil and its repairing method

[0037] The restoration agent includes a first composition and a second composition; wherein the first composition includes red mud, calcium dihydrogen phosphate and sodium fluorophosphate; the second composition includes ferric sulfate and calcium chloride.

[0038] A remediation agent for lead, arsenic, and cadmium composite polluted soil, the addition of its raw material components relative to the soil is 2.55g / kg red mud, 1.5g / kg calcium dihydrogen phosphate, 0.15g / kg sodium fluorophosphate, 5.3 g / kg ferric sulfate, 0.5g / kg calcium chloride.

[0039] Take the soil for testing and pass it through a 20-mesh sieve after being air-dried naturally, and then pass through a 20-mesh sieve. Take two parts of 200g contaminated soil, and add the first composition (0.51g red mud, 0.3g calcium dihydrogen phosphate and 0.03g sodium fluorophosphate) to one p...

Embodiment 2

[0043] This embodiment is a repairing agent for repairing lead, arsenic and cadmium composite polluted soil and its repairing method

[0044] The restoration agent includes a first composition and a second composition; wherein the first composition includes red mud, calcium dihydrogen phosphate and sodium fluorophosphate; the second composition includes ferric sulfate and calcium chloride.

[0045] A remediation agent for lead, arsenic, and cadmium composite polluted soil, its raw material components are added in an amount of 1g / kg red mud, 0.05g / kg calcium dihydrogen phosphate, 0.86g / kg sodium fluorophosphate, and 3.2g / kg ferric sulfate, 0.05g / kg calcium chloride.

[0046] Take the soil for testing and pass it through a 20-mesh sieve after being air-dried naturally, and then pass through a 20-mesh sieve. Take two parts of 200g contaminated soil, and add the first composition (0.2g red mud, 0.01g calcium dihydrogen phosphate and 0.172g sodium fluorophosphate) to one part, Mi...

Embodiment 3

[0050] This embodiment is a repairing agent for repairing lead, arsenic and cadmium composite polluted soil and its repairing method

[0051] The restoration agent includes a first composition and a second composition; wherein the first composition includes red mud, calcium dihydrogen phosphate and sodium fluorophosphate; the second composition includes ferric sulfate and calcium chloride.

[0052] A remediation agent for lead, arsenic, and cadmium composite polluted soil, the addition of its raw material components relative to the soil mass is 50g / kg red mud, 10g / kg calcium dihydrogen phosphate, 1g / kg sodium fluorophosphate, 1g / kg Iron sulfate, 1g / kg calcium chloride.

[0053] Take the soil to be tested, air-dry it naturally, grind it, pass it through a 20-mesh sieve, take two parts of 200g contaminated soil, add the first composition (10g red mud, 2g calcium dihydrogen phosphate and 0.2g sodium fluorophosphate) to one part, and turn it over Mix well, add 30% deionized water...

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Abstract

The invention discloses a repairing agent for repairing lead, arsenic and cadmium combined polluted soil and a repairing method thereof. The repairing agent comprises a first composition and a second composition. The first composition comprises red mud, monocalcium phosphate and sodium fluorophosphate; and the second composition comprises ferric sulfate and a calcium chloride aqueous solution. The method comprises the following steps of weighing the lead, arsenic and cadmium combined polluted soil and a first component, uniformly mixing, adding water, and stabilizing, dissolving the second component in water, and adding into the polluted soil, and continuously maintaining to obtain the repaired soil. The repairing agent is simple in component, high in practicability, suitable for heavy metal polluted soil, capable of efficiently and rapidly repairing heavy metal pollution, remarkably reducing the leaching concentration of heavy metal in the soil and guaranteeing the stability of lead, arsenic and cadmium in the soil for a long time, so that the heavy metal cannot be secondarily released, the materials are cheap and easy to obtain, red mud waste is utilized, the repairing cost is reduced and the environmental pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of soil pollution remediation, in particular to a remediation agent for remediating lead, arsenic and cadmium compound polluted soil and a remediation method thereof. Background technique [0002] Lead, arsenic, and cadmium are common chemicals in environmental chemical pollution, and they are also the most serious pollutants that endanger human health. Especially with the rapid development of modern industry and agriculture, the threat of lead, arsenic, and cadmium pollution to the environment is becoming more and more serious. At present, the mining, dressing and smelting of lead-zinc mines, which are relatively widely distributed in my country, have caused continuous pollution to the environment, and are the main sources of lead, arsenic and cadmium pollution; The discharge of lead, arsenic or cadmium compounds causes the pollution of the surrounding environment; the extensive use of lead, arsenic or cadmi...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08Y02P10/20
Inventor 杜心范传芳周晓峰颜珣畅拓崔岩山尹乃毅常旭卉
Owner 中铝环保节能集团有限公司
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