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Application of a phosphorus-based biochar material in the treatment of lead-contaminated soil

A technology of lead-contaminated soil and biochar, applied in the restoration of polluted soil, etc., can solve the problems of reducing the bioavailability of heavy metals, and achieve the effect of clean and sustainable process, slow release, and convenience for large-scale production

Active Publication Date: 2019-01-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When applied to the soil, biochar can adsorb heavy metals and fix them on the surface, significantly reducing the bioavailability of most heavy metals

Method used

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  • Application of a phosphorus-based biochar material in the treatment of lead-contaminated soil
  • Application of a phosphorus-based biochar material in the treatment of lead-contaminated soil
  • Application of a phosphorus-based biochar material in the treatment of lead-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] To prepare the phosphorus-based biochar material for repairing lead-contaminated soil of the present invention:

[0038] (1) Using PDA medium to activate and expand Aspergillus niger (Aspergillus niger), purchased from China Type Culture Collection, strain number CCTCC AF 91006;

[0039] (2) 1.0g of hydroxyapatite nanoparticles (particle size 97%) was added to 200mL of liquid PDA culture medium, and ultrasonic dispersion with a power of 100 watts was used for 2 hours;

[0040] (3) Put the PDA medium containing nano-hydroxyapatite into a high-temperature autoclave, set 115°C, and sterilize for 25 minutes. After high temperature and high pressure sterilization, the culture medium is transferred to the ultra-clean aseptic operation table, and the ultraviolet light is turned on for 60 minutes;

[0041] (4) In the ultra-clean aseptic operation table, inoculate the activated mycelium in step (1) into the sterilized medium of step (3), the inoculation volume is 2 mL; the mass concentr...

Embodiment 2

[0048] The soil was taken from low-polluted paddy soil around a lead-zinc tailings pond. After removing gravel and broken roots, the test soil is air-dried naturally, mixed evenly by quarter method, and crushed through an 18-mesh nylon sieve. The soil pH is 6.58, which is weakly acidic. The content of available Pb in the soil is 479.6mg / kg.

[0049] Separately add 0.2g of the phosphorus-based biochar material in Example 1 (the amount of n-HAP is equal to the amount of pure n-HAP weighed) and pure n-HAP into 5.0g of low-polluting soil, mix well, and add 10mL After fixing for 7 days, use 25mL DTPA to extract the effective form of lead in the soil. After testing, the effective lead content of low-polluted soil before and after treatment with phosphorus-based biochar material or pure n-HAP is shown in Table 1.

[0050] Table 1 Effective Pb content before and after treatment in low-polluted soil

[0051]

Embodiment 3

[0053] The soil was taken from highly polluted paddy soil around a lead-zinc tailings pond. After removing gravel and broken roots, the test soil is air-dried naturally, mixed evenly in quarters, and crushed through an 18-mesh nylon sieve. The soil pH is 6.52, which is weakly acidic. The content of available Pb in the soil is 1512.3mg / kg.

[0054] Separately add 0.2g of the phosphorus-based biochar material in Example 1 (containing the amount of n-HAP equal to the amount of pure n-HAP weighed) and pure n-HAP into 5.0g of highly contaminated soil, mix well, and add 10mL After fixation for 7 days, use 25mL DTPA to extract the effective form of lead in the soil. After testing, the effective content of lead in highly polluted soil before and after the phosphorus-based biochar material or pure n-HAP treatment is shown in Table 2 below.

[0055] Table 2 The content of available Pb before and after treatment of highly contaminated soil

[0056]

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Abstract

The invention discloses application of a phosphorus base charcoal material to remediation of lead contaminated soil. According to the phosphorus base charcoal material, microorganisms are used as raw materials; and a phosphorus base material with a specific ratio is doped to form the phosphorus base charcoal material with special structure and functions through anaerobic high-temperature carbonization. The material is simple in preparation process, lower in cost, biodegradable and free of secondary pollution; and the obtained phosphorus base charcoal material has a better effect on remediation of the lead contaminated soil, and the bioavailability of lead in the soil can be effectively reduced. The synthesized phosphorus base charcoal material is uniformly mixed with soil by a certain ratio; and after fixation by 7 days, available lead in the soil is reduced by 33.0-59.8%, so that the phosphorus base charcoal material has a better remediation effect compared with a pure phosphorus base material.

Description

Technical field [0001] The invention belongs to the technical field of soil heavy metal restoration, and specifically relates to the application of a phosphorus-based biochar material in the treatment of lead-contaminated soil. Background technique [0002] At present, the accumulation of heavy metal pollution in the soil environment in my country has increased the pressure on the soil environment, and large-scale regional pollution has occurred. According to a survey conducted by Guangming Daily in 2013, my country’s arable land contaminated by heavy metals amounts to 20 million hectares, accounting for 1 / 6 of the country’s total arable land. Lead in vegetables, food, fruits, meat, and livestock products in the suburbs of large and medium cities The over-standard rates were 38.6%, 28.0%, 27.6%, 41.9%, 71.1%. From the "Lead Pollution Incident" in Lushi County, Henan Province in 2006 to the "Blood Lead Excess Incident" in Zijin County, Heyuan, Guangdong Province in 2011, people gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/10
CPCB09C1/00B09C1/105
Inventor 杨志辉柴立元叶田田粱丽芬侍维王海鹰李青竹唐崇俭刘恢
Owner CENT SOUTH UNIV
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