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Cadmium contaminated soil remediation agent and preparation method thereof

A technology for cadmium-contaminated soil and remediation agent, which is applied in the field of cadmium-contaminated soil remediation agent and its preparation, can solve the problems of entering and threatening the quality and safety of crops, and achieves the effects of improving soil activity, facilitating large-scale production and reducing cadmium concentration.

Inactive Publication Date: 2021-02-12
湖南迈清环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the cadmium content in the soil is too high, which seriously threatens the quality and safety of crops and enters human health through the food chain, the purpose of the present invention is to provide a method that can effectively reduce the cadmium concentration in the soil, meet the national secondary soil quality standard, and can improve The organic matter in the soil improves the activity of the soil and has the advantages of rapid restoration of the soil, and the preparation method is simple, and the raw materials are easy to obtain, which is conducive to large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Its specific preparation method is as follows:

[0021] Step 1: According to the number of mass components, pyrolysis and carbonization at 350 ° C to obtain 20 parts of charred lignin, 5 parts of sodium dimethylthiocarbamate, 2 parts of lime, 1 part of sepiolite, and 3 parts of fulvic acid 1 part of sulfuric acid with a concentration of 60%, 0.5 part of Bacillus licheniformis with an effective viable count of 10 cfu / g, 0.5 parts of boron, molybdenum, zinc, manganese, cobalt and vanadium in equal mass ratio, and 2 parts of water;

[0022] Step 2: Pyrolysis and carbonization at 350° C. to obtain 20 parts of carbonized lignin and 2 parts of water according to the ratio of mass components, and mix them uniformly to obtain a mixed slurry;

[0023] Step 3: 5 parts of sodium dimethyl thiocarbamate, 2 parts of lime, 3 parts of fulvic acid, 1 part of sulfuric acid with a concentration of 60% and 10 cfu / g lichens with the ratio of the number of components by mass 0.5 part of Bac...

Embodiment 2

[0027] Step 1: According to the number of mass components, 30 parts of charred lignin, 10 parts of sodium dimethylthiocarbamate, 4 parts of lime, 2 parts of sepiolite and 4 parts of fulvic acid were obtained by pyrolysis and carbonization at 400°C , 2 parts of sulfuric acid with a concentration of 60%, 1 part of Bacillus licheniformis with an effective viable count of 20cfu / g, 1 part of boron, molybdenum, zinc, manganese, cobalt and vanadium in equal mass ratio, and 4 parts of water;

[0028] Step 2: Pyrolysis and carbonization at 400° C. to obtain 30 parts of carbonized lignin and 4 parts of water according to the ratio of mass components, and mix them uniformly to obtain a mixed slurry;

[0029] Step 3: 10 parts of sodium dimethylthiocarbamate, 4 parts of lime, 4 parts of fulvic acid, 2 parts of sulfuric acid with a concentration of 60% and 20 cfu / g lichens with a ratio of 10 parts by mass components 1 part of Bacillus was added to the mixed slurry, heated, and then ultrason...

Embodiment 3

[0033] Step 1: According to the number of mass components, pyrolysis and carbonization at 450 ° C to obtain 40 parts of charred lignin, 15 parts of sodium dimethylthiocarbamate, 6 parts of lime, 3 parts of sepiolite, and 5 parts of fulvic acid , 3 parts of sulfuric acid with a concentration of 60%, 1.5 parts of Bacillus licheniformis with an effective viable count of 30cfu / g, 1.5 parts of boron, molybdenum, zinc, manganese, cobalt and vanadium in equal mass ratio, and 6 parts of water;

[0034] Step 2: Pyrolysis and carbonization at 450° C. to obtain 40 parts of carbonized lignin and 6 parts of water according to the ratio of mass components, and mix them uniformly to obtain a mixed slurry;

[0035] Step 3: 15 parts of sodium dimethylthiocarbamate, 6 parts of lime, 5 parts of fulvic acid, 3 parts of sulfuric acid with a concentration of 60%, and 30 cfu / g lichens with effective viable bacteria 1.5 parts of Bacillus were added to the mixed slurry, heated, and then ultrasonically...

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Abstract

The invention belongs to the technical field of heavy metal contaminated soil remediation, and provides a cadmium contaminated soil remediation agent and a preparation method thereof. The cadmium contaminated soil remediation agent is prepared from the following components in parts by mass: 20 to 40 parts of lignin carbide, 5 to 15 parts of sodium dimethylthiocarbamate, 2 to 6 parts of lime, 1 to3 parts of sepiolite, 3 to 5 parts of fulvic acid, 1 to 3 parts of activating agent, 0.5 to 1.5 parts of bacillus licheniformis, 0.5 to 1.5 parts of trace elements and 2 to 6 parts of water. Lignin carbide and sodium dimethylthiocarbamate are jointly matched for use, cadmium in soil is stabilized, lime, sepiolite, fulvic acid, an activating agent, bacillus licheniformis and microelements are addedfor auxiliary use, the concentration of cadmium in soil can be effectively reduced, the national secondary soil quality standard is met. The soil remediation agent can improve organic matters in soiland improve soil activity, has the advantage of rapid soil remediation, and is simple in preparation method, easily available in raw materials and beneficial to large-scale production.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, and specifically provides a cadmium-contaminated soil remediation agent and a preparation method thereof. Background technique [0002] In recent years, due to the impact of industrial and mining survival activities, a large amount of heavy metals have entered the water environment through mining and smelting, enterprise sewage, pesticides and fertilizers, and domestic garbage, and endanger human health through the amplification of the food chain. Existing soil heavy metal pollution remediation methods mainly use in-situ passivation agents. Although heavy metals in the soil can be deactivated within a certain period of time and are not absorbed by crops, there is a risk of reactivation over time. . Heavy metal pollution includes lead, mercury, cadmium and zinc, etc. Among them, cadmium pollution is becoming more and more serious with the mining, smelting and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/00B09C1/08B09C1/10C09K101/00
CPCB09C1/00B09C1/08B09C1/10C09K17/40C09K2101/00
Inventor 詹景春
Owner 湖南迈清环保科技股份有限公司