Remediation method for cadmium-contaminated soil

A technology of cadmium-contaminated soil and restoration method, applied in the direction of restoration of polluted soil, etc., can solve the problems of energy consumption, difficult natural degradation, farmland hardening, etc., and achieve the effect of ensuring the harvest and strengthening the restoration effect.

Inactive Publication Date: 2015-09-02
南京宇行环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technique involves combining two different techniques: one for removing heavy metals called Cd2+ or other harmful substances found in soil through biodeposition with an active component made up mainly of bacteria like Bacillus subtilis spores. Another approach includes applying vegetable vaporized liquids containing calcium onto affected areas where they were previously covered without any layers of plaster afterwards. These methods help prevent damage caused by these chemical agents during excavations but still allow us to create effective treatment solutions against this problem.

Problems solved by technology

This patented technical problem addressed in this patent relates to reducing concentrations of contaminant metals (Cu) from soil while maintaining good fertility properties during plant growth cycles without causing negative side effects like poor nutrient absorption due to excessively high levels of certain compounds used in pesticides).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Biochar and wood vinegar were prepared from rice straw as raw materials.

[0024] Apply 90kg / mu of biochar to the cadmium-contaminated soil 10 days before rice planting, and then plant rice in the soil normally (3 kg of rice seeds per mu), and harvest when the ears of rice hang down and are golden and plump to obtain low-cadmium of rice. At this time, the cadmium content in the rice was measured to be 0.18 mg / kg. The obtained rice stalks are used to prepare biochar and wood vinegar for recycling.

[0025] After the paddy rice is harvested, put 0.4 jin of rapeseed in the cadmium-contaminated soil to make the rapeseed grow normally. water) / mu, the rapeseed will be harvested after it continues to grow to full maturity. The obtained rape stalks are used to prepare biochar and wood vinegar for recycling.

[0026] Through the graphite furnace atomic absorption spectrophotometry method of GB / T 17141-1997, the content of cadmium in the soil was measured to be 0.24mg / kg. Th...

Embodiment 2

[0028] Biochar and wood vinegar were respectively prepared from rape straw as raw materials.

[0029] Apply 100kg / mu of biochar to the cadmium-contaminated soil 20 days before rice planting, and then plant rice in the soil normally (4 kg of rice seeds per mu). When the ears of rice hang down and are golden and full, they can be harvested to obtain low-cadmium of rice. The cadmium content in rice was measured to be 0.17mg / kg. The obtained rice stalks are used to prepare biochar and wood vinegar for recycling.

[0030] After the paddy rice is harvested, put 0.5 jin of rapeseed in the cadmium-contaminated soil to make the rapeseed grow normally. water) / mu, the rapeseed will be harvested after it continues to grow to full maturity. The obtained rape stalks are used to prepare biochar and wood vinegar for recycling.

[0031] Through the graphite furnace atomic absorption spectrophotometry of GB / T 17141-1997, the content of cadmium in the soil was measured to be 0.22 mg / kg. Tha...

Embodiment 3

[0033] Biochar and wood vinegar were prepared from rice straw and rapeseed straw, respectively.

[0034] Apply 110kg / mu of biochar to the cadmium-contaminated soil 30 days before rice planting, and then plant rice in the soil normally (sow 6 kg of rice seeds per mu). When the ears of rice hang down and are golden and full, you can harvest low-cadmium of rice.

[0035] The cadmium content in rice was measured to be 0.18mg / kg. The obtained rice stalks are used to prepare biochar and wood vinegar for recycling.

[0036] After the paddy rice is planted, put 0.6 jin of rapeseed in the cadmium-contaminated soil to make the rapeseed grow normally, and apply the activator wood vinegar solution (8kg wood vinegar+800kg water) / mu, the rapeseed will be harvested after it continues to grow to full maturity. The obtained rape stalks are used to prepare biochar and wood vinegar for recycling.

[0037] Through the graphite furnace atomic absorption spectrophotometry of GB / T 17141-1997, th...

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PUM

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Abstract

The invention discloses a remediation method for cadmium-contaminated soil, and belongs to the field of soil remediation. In the remediation method, wood vinegar and biochar are prepared from rice straw and/or oilseed rape straw; paddy rice is planted in the cadmium-contaminated soil from May to October of each year firstly, and biochar is applied before paddy rice planting, so that paddy rice conforming to the national standard can be prepared in the cadmium-contaminated soil (to be specific, the cadmium content conforms to the national standard); oilseed rape is planted in the cadmium-contaminated soil from the time after the harvest of the paddy rice to May of next year, and wood vinegar is applied in a specific period to remove cadmium in the cadmium-contaminated soil safely and effectively, so that cadmium in the soil is effectively removed. Moreover, the method effectively utilizes the whole year, thereby guaranteeing the harvest of cereal crops while realizing the remediation of contaminated soil.

Description

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Claims

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Application Information

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Owner 南京宇行环保科技有限公司
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