Cadmium-contaminated soil composite microbial remediation agent 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 the field of remediation while production, which can solve the problems that the remediation planting method is difficult to take into account the economic benefits, reduce the remediation effect, and the risk is unknown, so as to achieve fast green Removal, Enhanced Quick Removal, Strong Tolerance

Active Publication Date: 2020-07-14
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • 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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  • Cadmium-contaminated soil composite microbial remediation agent and technical method for remediation while production
  • Cadmium-contaminated soil composite microbial remediation agent and technical method for remediation while production
  • Cadmium-contaminated soil composite microbial remediation agent and technical method for remediation while production

Examples

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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

The invention discloses a cadmium-contaminated soil composite microbial remediation agent and a technical method for remediation while production. The cadmium-contaminated soil composite microbial remediation agent is a composite microbial preparation of a Burkholderia cepacia preparation and a Ralstonia pickettii preparation in a volume ratio of 1:(0.8-1.2). The technical method comprises the following steps: (1) a production period: preparing soil, applying a Si / Fe or C / Fe composite cadmium polluted soil conditioner and a base fertilizer, planting rice, and harvesting; (2) repairing stage: a, applying base fertilizer, preparing soil and ridging, applying a soil cadmium activating agent and a cadmium-contaminated soil compound microorganism repairing agent, planting sorghum, and harvesting; b, weeding, fertilizing, preparing land, applying a soil cadmium activating agent and a cadmium contaminated soil composite microbial remediation agent, planting sedum alfredii hance, and harvesting. The restoration agent is high in cadmium reduction rate, good in restoration efficiency, stable, green and safe; the method disclosed by the invention integrates soil conditioning, plant and microorganism remediation, and is high in economic benefit, short in period, low in cost, simple to operate and suitable for agricultural popularization.

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 Applications(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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