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Heavy metal polluted soil composite eluting agent

A compound eluent and polluted soil technology, applied in the restoration of polluted soil, soil conditioning materials, fertilizer mixtures, etc., can solve the problems of affecting the normal growth of plants in the later season and low EDTA biodegradation rate.

Inactive Publication Date: 2016-11-09
汪立刚
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Problems solved by technology

[0006] The artificial chelating agent EDTA can effectively increase the solubility of heavy metals in the soil and improve the mobility of heavy metals in the soil, but there are some problems in itself, such as the low biodegradation rate of EDTA, and its long-term residue in the soil will affect the normal growth of off-season plants. growth, the negative impact on the environment may last for a considerable period of time

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  • Heavy metal polluted soil composite eluting agent

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Embodiment Construction

[0010] The test soil was collected from a smelter leftover site, and the main pollutants were heavy metals Cu, Cr, and Pb.

[0011] The indoor simulated soil column is a glass tube with a height of 50cm and an inner diameter of 50mm. The soil column contains 553g of soil, the height of the soil layer is about 20cm, and the soil compactness is 1.42g / cm 3 . The bottom of the soil column is fixed with a 400-mesh screen, which can bear the soil and allow the rinsing solution to flow out. Wet the saturated soil sample with double distilled water first, then add each eluent, at about 1mL·min -1 The uniform flow rate is used for leaching, and the lower end of the glass tube is used to collect each leachate in turn with a beaker and concentrate on processing separately. The eluent volume is 6 times the soil pore volume (the soil pore volume used in this experiment was determined to be about 230mL).

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Abstract

The invention relates to a heavy metal polluted soil composite eluting agent, and discloses a new preparation method and an eluting method of a new eluting agent against soil polluted by heavy metals comprising lead, chromium and copper. The preparation method of the heavy metal eluting agent comprises the following steps: mixing Na2EDTA with Na3EDDS in an equimolar manner (with the respective mole concentration of 0.1 M) to form a composite eluting solution, and adjusting the pH value of the composite eluting solution to 10 by using 0.1 M of an NaOH solution. The eluting method comprises the following steps: moistening a saturated soil sample with re-distilled water, and eluting the saturated soil sample with the composite eluting agent according to a uniform flow velocity of about 1 mL.min<-1>, wherein the use amount of the eluting solution is 6 times the aperture volume of the soil. The composite eluting agent allows the lead eluting removal rate to be 76%, the chromium eluting removal rate to be 48% and the copper eluting removal rate to be 86%, and has obvious better effects than single eluting agents.

Description

technical field [0001] The invention belongs to the field of contaminated soil remediation, and the pollutants are heavy metals lead (PB), chromium (Cr) and copper (Cu), and relates to the preparation and leaching method of a heavy metal leaching agent in polluted soil. Background technique [0002] Metal pollution in soil has become one of the problems of sustainable development of agriculture in our country. At present, the rate of excessive heavy metal pollution in cultivated land soil in my country is 16.7%, and the polluted soil is about 300 million mu, accounting for 1 / 6 of the total cultivated land area. Heavy metal pollution mainly comes from sewage irrigation, extensive use of chemical fertilizers and pesticides, "three wastes" from electroplating and dye factories, urban garbage, and atmospheric deposition. [0003] There are about 45 million mu of land polluted by metal mining in my country. Metal mine mining, mineral processing, smelting and other activities le...

Claims

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Application Information

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IPC IPC(8): C09K17/14B09C1/02B09C1/08
CPCB09C1/02B09C1/08C09K17/14
Inventor 汪立刚
Owner 汪立刚
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