A kind of curing agent and curing method thereof

A technology of curing agent and peat, applied in the field of environmental engineering, can solve the problems of unfavorable As fixation, easy leaching of Pb, no treatment method, etc., and achieve the effect of enhancing soil fertility level, low cost and strong metal adsorption capacity

Active Publication Date: 2019-01-18
广东旷野生态环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no effective treatment method for the compound pollution of Pb and As.
Because in the case of higher pH, it is conducive to the fixation of Pb, but not conducive to the fixation of As, conversely, in the case of lower pH, it is beneficial to the fixation of As and not conducive to the fixation of Pb; Pb is easy to leach at low pH

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Weigh 30% of fly ash, 35% of lime, and 35% of peat. The peat is calcined in a muffle furnace at a high temperature of 400°C for 4 hours, and then fully pulverized and mixed with a ball mill to obtain a curing agent;

[0037] 2) Weigh 100g of Pb and As contaminated soil, add 15g of the above curing agent, mix well, add 40% (weight ratio) tap water of the mixture, stir well for 10min, mix well, seal with a film, leave it for 15 days ;

[0038] 3) After 15 days, the solidified body was leached by solid waste leaching toxicity leaching method-Acetic acid buffer solution method (HJ / T300-2007) to obtain the leaching solution, and the soil was measured using "Soil pH Measurement" (Agricultural Industry Standard NY / T 1377-2007) pH value.

[0039] After testing, the leaching concentration of Pb dropped from 34.1 mg / L before curing to 3.8 mg / L after curing, which was lower than the detection value, and the leaching concentration of As dropped from 21.2 mg / L before curing to 2.0 mg / L...

Embodiment 2

[0041] 1) Weigh 40% fly ash, 40% lime, and 20% peat. The peat is calcined in a muffle furnace at a high temperature of 400°C for 4 hours, and then pulverized and mixed with a ball mill to obtain a curing agent;

[0042] 2) Weigh 100g of Pb and As contaminated soil, add 15g of the above curing agent, mix well, add 40% (weight ratio) tap water of the mixture, stir well for 10min, mix well, seal with a film, leave it for 15 days ;

[0043] 3) After 15 days, the solidified body was leached by solid waste leaching toxicity leaching method-Acetic acid buffer solution method (HJ / T300-2007) to obtain the leaching solution, and the soil was measured using "Soil pH Measurement" (Agricultural Industry Standard NY / T 1377-2007) pH value.

[0044] After testing, the leaching concentration of Pb dropped from 34.8 mg / L before curing to 3.3 mg / L after curing, which was lower than the detection value, and the leaching concentration of As dropped from 21.5 mg / L before curing to 2.1 mg / L after curing. ...

Embodiment 3

[0046] 1) Weigh 30% by weight of fly ash, 51% of lime, and 19% of peat. The peat is first calcined in a muffle furnace at a high temperature of 400°C for 4 hours, and then fully pulverized and mixed by a ball mill to obtain a curing agent;

[0047] 2) Weigh 100g of Pb and As contaminated soil, add 15g of the above curing agent, mix well, add 40% (weight ratio) tap water of the mixture, stir well for 10min, mix well, seal with a film, leave it for 15 days ;

[0048] 3) After 15 days, the solidified body was leached by solid waste leaching toxicity leaching method-Acetic acid buffer solution method (HJ / T300-2007) to obtain the leaching solution, and the soil was measured using "Soil pH Measurement" (Agricultural Industry Standard NY / T 1377-2007) pH value.

[0049] After testing, the leaching concentration of Pb dropped from 33.6 mg / L before curing to 2.5 mg / L after curing, which was lower than the detection value, and the leaching concentration of As dropped from 22.3 mg / L before curi...

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PUM

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Abstract

The invention relates to a curing agent and a curing method thereof. The polluted soil heavy metal curing agent is characterized by comprising, by weight, 30-40% of fly ash, 35-51% of lime, and 19-35% of peat. According to the present invention, when the curing agent is used to treat the polluted soil, the curing agent and the heavy metal-polluted soil are completely mixed according to a weight ratio of 1:15 so as to obtain a mixed material, water with the amount of 40% of the weight of the mixed material is added, and complete stirring mixing is performed; and the polluted soil heavy metal curing agent completely adopts the nature minerals as the raw materials so as not to produce secondary pollution, and the heavy metals are cured while the soil fertilizer efficiency can be effectively improved so as to solve the technical problems of significant soil pH value changing and soil hardening of the existing chemical repair method.

Description

Technical field [0001] The invention belongs to the technical field of environmental engineering, and particularly relates to a curing agent and a method of use. Background technique [0002] Heavy metals generally refer to about 45 elements with a specific gravity above 5.0g / cm3. Heavy money in environmental pollution research [0003] Genus mainly refers to elements with significant biological toxicity such as Pb, Cd, Hg, Cr and metal-like As, and also includes elements such as heavy metals such as Zn, Cu, Co, Ni and Sn with certain toxicity. The cadmium rice incidents that have occurred in China in recent years have attracted great attention from the party and the country. On February 18, 2011, the “Twelfth Five-Year Plan” for the Comprehensive Prevention and Control of Heavy Metal Pollution was formally approved by the State Council and became the first approved “Twelfth Five-Year Plan”. According to the requirements of the plan, the central government will invest in A speci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C09K17/08B09C1/08
Inventor 孟涛
Owner 广东旷野生态环境科技有限公司
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