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A kind of preparation method of compound leaching agent for chromium polluted soil

A technology of chromium-contaminated soil and compound eluent, applied in the field of soil remediation, to achieve the effect of easy-to-obtain, simple raw materials, and cost reduction

Inactive Publication Date: 2018-03-30
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Screening out a suitable and effective soil leaching agent is very critical and important for soil remediation, but the prior art uses organic acid leaching for chromium-contaminated soil, especially the highly toxic hexavalent chromium soil leaching agent agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of preparation method of chromium-contaminated soil compound eluent that the present invention proposes comprises the steps:

[0021] S1, take the inclined-plane PDA containing Aspergillus niger, rinse the surface of the inclined-plane PDA with sterile water to obtain the first mixed material, place the first mixed material in a sterile Erlenmeyer flask, and vibrate at a speed of 145rpm for 13h to obtain black Aspergillus liquid, culture temperature is 28 ℃;

[0022] S2. Grind the saponin shell to a particle size of 2-3mm, add water and mix it, and then sterilize at high temperature. The mass-volume ratio (g / L) of the crushed saponin shell to water is 6:5, and the high-temperature sterilization temperature is 125 ℃, the time of high temperature sterilization is 18min, after cooling to room temperature, add Aspergillus niger liquid, place on constant temperature shaker and cultivate for 125h to obtain the second mixed material, the cultivation temperature of const...

Embodiment 2

[0025] A kind of preparation method of chromium-contaminated soil compound eluent that the present invention proposes comprises the steps:

[0026] S1. Take the inclined-plane PDA containing Aspergillus niger, rinse the surface of the inclined-plane PDA with sterile water to obtain the first mixed material, place the first mixed material in a sterile Erlenmeyer flask, and vibrate at a speed of 155 rpm for 11 hours to obtain black Aspergillus liquid, culture temperature is 32 ℃;

[0027] S2. Grind the saponin shell to a particle size of 2-3mm, add water and mix it and then sterilize it at high temperature. The mass volume ratio (g / L) of the crushed saponin shell to water is 8:15, and the temperature of high temperature sterilization is 120 ℃, the time of high-temperature sterilization is 21min, after cooling to room temperature, add Aspergillus niger liquid, place it on a constant temperature shaker and cultivate for 115h to obtain the second mixed material, the cultivation tem...

Embodiment 3

[0030] A kind of preparation method of chromium-contaminated soil compound eluent that the present invention proposes comprises the steps:

[0031] S1. Take the inclined-plane PDA containing Aspergillus niger, rinse the surface of the inclined-plane PDA with sterile water to obtain the first mixed material, place the first mixed material in a sterile Erlenmeyer flask, and shake and cultivate it at a speed of 152rpm for 11.5h to obtain Aspergillus niger liquid, culture temperature is 31 ℃;

[0032] S2. Crush the saponin shell to a particle size of 2-3mm, add water and mix it and then sterilize at high temperature. The mass-volume ratio (g / L) of the crushed saponin shell to water is 9:14, and the high-temperature sterilization temperature is 120 ℃, the time of high temperature sterilization is 20min, after cooling to room temperature, add Aspergillus niger liquid, place it on a constant temperature shaker and cultivate it for 119h to obtain the second mixed material. Wherein th...

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Abstract

The invention discloses a preparation method of a composite leaching agent for chromium-contaminated soil, which comprises the following steps: taking an inclined-plane PDA containing Aspergillus niger, washing the surface of the inclined-plane PDA with sterile water to obtain a first mixed material, and dissolving the first mixture The material is placed in a sterile Erlenmeyer flask, shaken and cultured for 11-13h to obtain the Aspergillus niger liquid; crush the saponins shell until the particle size is 2-3mm, add water and mix it, then sterilize it at high temperature, add the Aspergillus niger liquid after cooling to room temperature, Place it on a constant temperature shaker and cultivate it for 115-125 hours to obtain the second mixed material; after the second mixed material is left to settle completely, take the upper liquid and add it to citric acid and mix evenly to obtain a chromium-contaminated soil eluent. The raw material of the invention is simple and easy to obtain, the preparation process is simple, the preparation cost is greatly reduced, the leaching rate of chromium in the soil is high, and the remediation soil will not bring secondary pollution.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a preparation method of a composite leaching agent for chromium-contaminated soil. Background technique [0002] With the extensive use of chromium salts in manufacturing, metal processing, tanning, printing and dyeing and other industries, the accumulation of high concentrations of chromium in the environment has become an environmental problem that cannot be ignored. In recent years, due to the illegal dumping of highly toxic chromium slag by chemical plants, which caused the death of local livestock, and the serious pollution of farmland and water quality, the incident of chromium poisoning has aroused the attention of all parties. At the same time, due to historical reasons, the solid waste generated in the production process of most chromium salt factories in my country, that is, chromium slag, is mainly disposed of by simple stockpiling without anti-seepage measure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10
Inventor 熊华斌魏薇刘晓海高云涛李晓芬刘天成罗利军熊艳高金婷张继谢尧娟陈佳静
Owner YUNNAN MINZU UNIV
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