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Method for stabilizing Pb in calcareous Pb-contaminated soil by combining hydrochloric acid and monopotassium phosphate

A technology of potassium dihydrogen phosphate and lead-contaminated soil, which is applied to the field of lead stabilization by applying hydrochloric acid and potassium dihydrogen phosphate in calcareous lead-contaminated soil, which can solve the problems of poor lead stabilization effect and reduced soil lead availability, and achieves less effective, less effective effect

Inactive Publication Date: 2012-04-18
HENAN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method of applying hydrochloric acid and potassium dihydrogen phosphate into calcareous lead-contaminated soil simultaneously to reduce the effectiveness of soil lead, so as to overcome the existing method of only adding phosphate in calcareous lead-contaminated soil , the disadvantage of poor effect of stabilizing lead

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Embodiment Construction

[0014] The method of utilizing hydrochloric acid and potassium dihydrogen phosphate to stabilize the lead in lead-contaminated soil of the present invention can be described in detail with a specific example, and its concrete steps are as follows:

[0015] 1. Take a small amount of calcareous lead-contaminated soil with a water content of less than 5% and a lead content of 2337mg / kg that has passed through a 2mm sieve to measure its water content, and then take soil equivalent to 3200g of dried soil according to the water content.

[0016] 2. According to P:Pb=2, calculate the potassium dihydrogen phosphate (KH 2 PO 4 ) quantity, the calculation result is 9.8237g. Calculate the volume of concentrated hydrochloric acid added by adding 1.50 mL per kilogram, and the calculated result is 4.80 mL.

[0017] 2. Accurately weigh 9.8237g KH according to the calculation result 2 PO 4 , dissolved in distilled water to make about 100mL solution, and set aside; draw 4.80mL concentrated...

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Abstract

The invention, belonging to the field of heavy metal contaminated soil remediation, relates to a method for stabilizing Pb in calcareous Pb-contaminated soil, in particular to a method for stabilizing Pb by adding hydrochloric acid and monopotassium phosphate in the calcareous Pb-contaminated soil. The invention solves the technical problem that Pb in the calcareous Pb-contaminated soil has high effectiveness, and the direct addition of monopotassium phosphate has little impact on reducing the effectiveness of Pb in the soil. The method comprises the following steps: first, taking calcareous Pb-contaminated soil which has a water content of less than 5% and is screened by a sieve of 2 mm, calculating the mass of monopotassium phosphate according to the following relation: P / Pb(mol:mol)=1.5-2.5:1, calculating the volume of concentrated hydrochloric acid according to the relation that 1.2-1.7 ml concentrated hydrochloric acid is added in per kg of soil, then weighing monopotassium phosphate and dissolving the monopotassium phosphate in distilled water to prepare an 5-15 % (g / ml)aqueous solution; then taking hydrochloric acid and diluting the hydrochloric acid with distilled water by 10-15 times; and finally uniformly spraying the prepared solutions in the Pb-contaminated soil, uniformly mixing, adjusting the water content to 15-25%, and culturing for more than 50 d.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal-contaminated soil, and relates to a method for stabilizing lead in lead-contaminated soil, in particular to a method for stabilizing lead by applying hydrochloric acid and potassium dihydrogen phosphate in calcareous lead-contaminated soil. Background technique [0002] Soil lead pollution is relatively common in some areas of China, especially in some non-ferrous metal mining areas and surrounding areas of smelters. Lead is an accumulative poison. Lead in the soil can be absorbed by organisms and transferred to organisms. Lead-contaminated soil can also enter children's bodies through the hand-mouth route, affecting children's health. Compared with pollutants such as cadmium and arsenic, lead in soil is not easily absorbed by plants. Compared with background lead in soil, lead in polluted soil has higher availability and mobility. Therefore, adding various stabilizers Reducing the effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 李立平向国强邢维芹王亚利
Owner HENAN UNIVERSITY OF TECHNOLOGY
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