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Acid phosphate stabilization reparation method of lead contaminated soil

A technology of lead-contaminated soil and phosphate, applied in the restoration of polluted soil and other directions, can solve the problems of reducing the effectiveness of lead, long consumption cycle, insufficiency, etc., and achieve the effect of short cycle

Active Publication Date: 2015-04-01
重庆汇亚环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that adding phosphate solution alone to stabilize lead-contaminated soil is not only inefficient, but also takes a long time
[0004] CN102416403A discloses a combination of hydrochloric acid and potassium dihydrogen phosphate to stabilize lead in calcareous lead-contaminated soil. Adding hydrochloric acid and potassium dihydrogen phosphate to calcareous lead-contaminated soil can significantly reduce lead in calcareous lead-contaminated soil. The effective effect of this method, the maintenance period of this method is long, and the effect of completely stabilizing lead in the soil cannot be achieved. Before and after stabilization, the lead content in the soil leachate is still about 20% of that before treatment.
no significant effect
It cannot meet the requirements of the maximum concentration limit of 0.25 mg / L in the "Standards for Pollution Control of Domestic Waste Landfill Sites"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Lead content in the original soil leachate: According to the method of "Acetic Acid Buffer Method for Leaching Toxicity in Solid Waste Leaching" HJ / T 300-2007 method, the lead content in the leachate of contaminated soil is 1000mg / kg, 3000mg / kg, 6000mg / kg and 9000mg / kg The lead contents in the samples were 51.8mg / L, 81.9mg / L, 161.6mg / L and 278.9 mg / L respectively.

Embodiment 2

[0022] 1000mg / kg soil stabilization treatment: take by weighing 100g five parts of soil whose lead concentration is about 1000mg / kg; Dissolve the salt in 10mL of phosphoric acid solution with a mass fraction of 10%; spray the mixed solution prepared above evenly into the soil, stir evenly so that the pH of the soil is less than 5, adjust the soil water content to 18%-23%, and maintain the water content After curing at room temperature for 3 days, the lead contents in the test soil leachate were 1.762mg / L, 0.8926mg / L, 0.6614mg / L, 0.4651mg / L, 0.2187mg / L, 0.1867mg / L and 0.1534mg / L respectively. Among them, the experiment of adding 5.0-7.0% sodium phosphate can meet the requirement that the lead content in the leachate is lower than 0.25 mg / L.

Embodiment 3

[0024] 3000mg / kg soil stabilization treatment: take by weighing 100g five parts of soil whose lead concentration is about 3000mg / kg; Dissolve sodium in 10mL of phosphoric acid solution with a mass fraction of 13%; spray the mixed solution prepared above into the soil evenly, and stir evenly so that the pH of the soil is less than 5, stir evenly, and adjust the soil water content to 18%-23%, After maintaining the moisture content and curing at room temperature for 3 days, the lead contents in the test soil leachate were 1.861mg / L, 1.131mg / L, 0.6272mg / L, 0.4211mg / L, 0.2294mg / L, 0.1876mg / L and 0.1438mg respectively / L. Among them, the experiment of adding 6.0-8.0% sodium phosphate can meet the requirement that the lead content in the leachate is lower than 0.25 mg / L.

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PUM

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Abstract

The invention discloses an acid phosphate stabilization reparation method of lead contaminated soil. The acid phosphate stabilization reparation method is characterized by comprising the following steps: adding a sodium phosphate and phosphoric acid mixed solution into lead contaminated soil, stirring uniformly, and then maintaining. According to the invention, after stabilization treatment, the lead content of leachate in the lead contaminated soil is less than the lead content concentration limit value 0.25mg / L in standard for pollution control on the landfill site of municipal solid waste. The stabilization treatment time only needs 3 days, and the cycle is short; the reason for the short stabilization treatment time by using the acid phosphate solution is that a hydrogen ion can promote lead at the weak acid state to be dissolved, and moreover, a phosphate anion and a lead ion can generate lead phosphate precipitate which is insoluble in water.

Description

technical field [0001] The invention relates to a method for repairing lead-contaminated soil, in particular to a method for stabilizing and repairing acidic phosphate in lead-contaminated soil. Background technique [0002] With the development of social economy, people pay more and more attention to environmental problems. Heavy metal pollutants enter the soil through various channels, among which lead is one of the most common heavy metals in soil pollution. The main causes of soil lead pollution can be attributed to coal burning, industrial lead, vehicle exhaust, mining and smelting, etc. After lead in the soil enters the human body through the food chain or breathing, the body presents symptoms such as nausea, vomiting, constipation, and diarrhea; severe cases also present liver disease, peripheral neuropathy, and hemolytic anemia. Lead is a non-essential element of plants. When it comes into contact with plants, it will have a certain poisonous effect on plants. At th...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 高焕方谭怀琴黄国文
Owner 重庆汇亚环保工程有限公司
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