Method for restoring heavy metal contaminated soil through double-liquid-phase extraction
A technology of polluted soil and heavy metals, applied in the restoration of polluted soil, etc., to achieve high repair efficiency, high work efficiency, and high degree of greening
Inactive Publication Date: 2014-12-10
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology
[0005] The purpose of the present invention is to overcome the shortcomings of the extraction method for repairing heavy metal-contaminated soil, give full play to the advantages of the extraction method, and provide a new method for fast, efficient and green repair of heavy metal-contaminated soil
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Embodiment 1
[0025] (1) Infiltration of heavy metal contaminated soil
[0026] The heavy metal-contaminated soil was air-dried under natural conditions, crushed lightly and passed through a 2 mm sieve to remove impurities. Add 100 kg of heavy metal-contaminated soil with a dry weight and sieve to remove impurities in the extractor, add 500 kg of an aqueous solution with a mass percent concentration of 0.1% citric acid and 0.1% ammonium sulfate, and extract the heavy metal-contaminated soil and leaching solution at room temperature. Take the liquid (that is, 0.1% citric acid and 0.1% ammonium sulfate aqueous solution) and stir and mix thoroughly for 15 minutes to obtain a mixture of leachate and soil.
[0027] (2) Two-liquid phase extraction for separation of heavy metals
[0028] In the extractor containing 600 kg of "a mixture of leaching solution and soil", add 50 kg of P204 sulfonated kerosene organic phase with a saponification rate of 50% and a concentration of 15%, and fully stir an...
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The invention discloses a method for repairing heavy metal polluted soil by two-liquid phase extraction. The restoration system of the method has two liquid phases, one of which is an aqueous phase formed by dissolving a leaching agent in water, and the other liquid phase is an organic phase formed by dissolving an acidic extractant in an organic solvent. The method of the present invention mainly includes five basic steps: (1) infiltration of heavy metal-contaminated soil; (2) two-liquid phase extraction and separation of heavy metals; (3) stripping and recovery of heavy metals; (4) ammonia saponification of P204 organic phase; (5) ) soil washing. Using citric acid and ammonium sulfate as leaching agents and P204 as extraction agent, the removal rates of bioavailable lead and bioavailable cadmium can reach more than 90%. The invention has the advantages of fast restoration speed, high restoration efficiency, high utilization rate of the leaching agent, high restoration work efficiency, high greening degree, simultaneous recovery of heavy metals, and low restoration cost.
Description
technical field [0001] The invention relates to a method for repairing heavy metal-contaminated soil by two-liquid phase extraction, in particular to a method for synergistically repairing heavy metal-contaminated soil with a leaching agent and an extraction agent. Background technique [0002] With economic development, especially the acceleration of industrialization and urbanization, heavy metal elements continue to enter the soil with sewage, atmospheric deposition, solid waste, and agricultural materials, resulting in increasingly serious soil heavy metal pollution. At present, the area of arable land polluted by heavy metals in my country is about 150 million mu; the amount of food polluted by heavy metals in the country is as high as 12 million tons every year, and the annual production of food due to heavy metal pollution is reduced by more than 10 million tons, and the total economic loss exceeds 30 billion yuan. [0003] There are many types of remediation method...
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IPC IPC(8): B09C1/08
Inventor 钟学明
Owner NANCHANG HANGKONG UNIVERSITY