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Compound microbial remediation agent for cadmium-contaminated soil and technical method for remediation while production

A technology for cadmium-contaminated soil and compound microorganisms is applied in the field of compound microbial remediation agent for cadmium-contaminated soil and remediation while production, which can solve the problems of the remediation planting method being difficult to take into account economic benefits, unfavorable for wide-scale popularization, and poor remediation effect, etc. The effect of repairing efficiency and stability, ensuring safe and high-quality production, and improving farming performance

Active Publication Date: 2022-02-18
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, returning the straw to the field makes the Cd in the straw return to the field, and the removal of Cd is purely by means of phytoremediation to reduce the cadmium content in the soil, and the repaired plants are easily affected by external factors (such as climate, temperature, etc.) Lead to poor growth and reduce the repair effect
[0011] In summary, the existing restoration agents for cadmium-enriched auxiliary plants have technical defects such as poor restoration effect, instability, and unknown risks, and the restoration and planting methods are also difficult to take into account economic benefits, which is not conducive to large-scale promotion

Method used

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  • Compound microbial remediation agent for cadmium-contaminated soil and technical method for remediation while production
  • Compound microbial remediation agent for cadmium-contaminated soil and technical method for remediation while production
  • Compound microbial remediation agent for cadmium-contaminated soil and technical method for remediation while production

Examples

Experimental program
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Effect test

reference example 1

[0099] Reference Example 1 Si / Fe Composite Cadmium Contaminated Soil Improver

[0100] 1mol / L of Fe(NO 3 ) 3 solution and 4mol / L NaOH solution with Fe(NO 3 ) 3 After mixing and reacting with NaOH in a molar ratio of 1:0.5, the hydroxyl iron solution is obtained. According to the mass ratio of hydroxyl iron and diatomaceous earth as 3:1, diatomaceous earth is added to the hydroxyl iron solution and mixed, and stirred until it is muddy. Baking at 110°C for 48 hours to obtain Si / Fe composite cadmium-contaminated soil improver.

reference example 2

[0101] Reference example 2 C / Fe compound cadmium polluted soil amendment

[0102] FeSO 4 ·7H 2 O and wetland plant straw biochar are added to water at a molar mass ratio of 0.5:1:100mol / g / g, nitrogen gas is introduced, stirred, and then absolute ethanol (volume ratio to water is 0.5:1) is added, and the stirring is continued. Then add grape seed extract (volume ratio of water to 0.3:1), continue to stir until the solution turns black, vacuum filter, wash the filter residue with water and absolute ethanol four times successively, and dry it in vacuum at 80°C for 24 hours , to obtain a C / Fe composite cadmium-contaminated soil improver; the preparation method of the grape seed extract is as follows: the grape seed is placed in water with a mass-volume ratio of 4:100 g / mL, and heated in a sealed water bath for 1.0 h at 80° C. , filtered to obtain grape seed extract.

[0103] Cadmium Contaminated Soil Composite Microbial Restoration Agent Example 1

[0104] Cadmium-contaminated...

Embodiment 1

[0113] The planting period of rice-sorghum-sedum sedum is seamlessly connected, and divided into production period and repair period to form a closed cycle repair cycle:

[0114] (1) Production period:

[0115] Soil improvement and rice planting: On April 3, 2018, on the cadmium-contaminated plot, the plot was plowed, and the soil moisture content was kept at 85% of the field water capacity after plowing. Plowing rate ≥ 3 times / m, vegetation coverage rate ≥ 60% below the surface, vertical and back-fading rate ≤ 5%, plowing depth of 15cm, build ridges, start irrigation and drainage ditches;

[0116] On April 4, 2018, 200 kg / mu of Si / Fe compound cadmium-contaminated soil amendment and 30 kg / mu of base fertilizer (compound fertilizer with a mass ratio of N:P:K of 15:15:15) were applied;

[0117] On April 10, 2018, rice seedlings of Xiangzaoxian No. 32 were manually transplanted using conventional water seedling cultivation. The transplanting density was 0.933 million holes / mu, 5...

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Abstract

A compound microbial remediation agent for cadmium-contaminated soil and a technical method for repairing while producing it. The compound microbial remediation agent for cadmium-contaminated soil is a preparation of Burkholderia cepacia and a preparation of Ralstonia skinneri in a volume ratio of 1:0.8 to 1.2 complex bacterial preparations. The technical method is as follows: (1) production period: site preparation, applying Si / Fe or C / Fe compound cadmium-contaminated soil amendment and base fertilizer, planting rice, and harvesting; (2) restoration period: a. applying base fertilizer, site preparation and ridging , applying soil cadmium activator and cadmium-contaminated soil composite microbial remediation agent, planting sorghum, and harvesting; b. Weeding, fertilizing, site preparation, applying soil cadmium activator and cadmium-contaminated soil composite microbial remediation agent, planting Sedum sedum, and harvesting. The restoration agent of the invention has high cadmium reduction rate, good and stable restoration efficiency, and is green and safe; the method of the invention integrates soil conditioning, plant and microorganism restoration, has high economic benefits, short cycle, low cost, simple operation, and is suitable for agricultural promotion.

Description

technical field [0001] The invention relates to a cadmium-contaminated soil remediation agent and a remediation method, in particular to a cadmium-contaminated soil composite microbial remediation agent and a technical method for remediation while production. Background technique [0002] In recent years, due to the intensification of industrial and mining activities and the unreasonable use of various pesticides and fertilizers in agricultural production, soil heavy metal pollution has become increasingly serious. According to estimates, the loss of my country's grain production due to heavy metal (metalloid) pollution exceeds 10 million tons per year, resulting in a total economic loss of more than 20 billion yuan. Heavy metal pollution control has become one of the urgent environmental problems in my country. [0003] According to the survey, agricultural soil polluted by heavy metals accounts for about 16.7% of the farmland planting area, of which more than 40% of the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10B09C1/00B09C1/08
CPCB09C1/10B09C1/105B09C1/08
Inventor 朱健王平麻淳雅王玉竹谭淼王沛颖朱烨林
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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