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Preparation and application of a heavy metal-contaminated acidic soil remediation-improvement material

A technology of acidic soil and heavy metals, applied in the field of environmental science and engineering, can solve problems such as food safety and crop production reduction, and achieve the effect of improving soil compaction and low cost

Active Publication Date: 2021-02-09
NANJING FORESTRY UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the crop yield reduction and potential food safety problems caused by acidic soil polluted by heavy metals, the present invention uses agricultural and forestry waste as the basic raw material, hydrothermally treats, and designs the agricultural and forestry waste after high-temperature activation and carbonization of calcium carbonate, and skillfully converts the calcium carbonate Combining the decomposition and the preparation of porous biochar, the calcium salt-porous biochar composite material with high calcium salt content and developed pore structure was successfully prepared, which was applied to the acidic soil polluted by heavy metals to comprehensively improve the acidic soil and blunt heavy metals, and efficiently realize the remediation and improvement of acidic soil polluted by heavy metals

Method used

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  • Preparation and application of a heavy metal-contaminated acidic soil remediation-improvement material
  • Preparation and application of a heavy metal-contaminated acidic soil remediation-improvement material
  • Preparation and application of a heavy metal-contaminated acidic soil remediation-improvement material

Examples

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Embodiment 1

[0035] The present embodiment provides the preparation method of calcium salt-porous biomass charcoal composite material, comprises the following steps:

[0036] 1) Weigh a certain amount of soybean straw powder into a beaker, add water until the solid-to-liquid ratio is 320g / L, put it into a hydrothermal reaction kettle, heat at 220°C for 4 hours, take it out after cooling, and dry it in an oven at 70°C to obtain soybeans Straw hydrothermal charcoal.

[0037]2) Take 6g of soybean straw hydrothermal charcoal, mix it with 12g of calcium carbonate powder (the mass ratio of calcium carbonate to agricultural and forestry waste is 2:1), put it in a corundum crucible, heat up to 800°C at 5°C / min, Keep it for 1h, then cool down to room temperature, the nitrogen flow rate in the whole process is 200mL / min, and the black residue is the calcium salt-porous biochar composite material.

[0038] Such as figure 1 It is the X-ray diffraction pattern of the calcium salt-porous biochar compo...

Embodiment 2

[0042] The present embodiment provides the preparation method of calcium salt-porous biomass charcoal composite material, comprises the following steps:

[0043] 1) Weigh a certain amount of soybean straw powder into a beaker, add water until the solid-to-liquid ratio is 100g / L, put it into a hydrothermal reaction kettle, heat at 150°C for 12 hours, take it out after cooling, and dry it in an oven at 70°C to obtain soybeans Straw hydrothermal charcoal.

[0044] 2) Take 6g of soybean straw hydrothermal charcoal, mix it with 0.6g of calcium carbonate powder (the mass ratio of calcium carbonate to agricultural and forestry waste is 0.1:1), put it in a corundum crucible, and heat up to 600°C at 1°C / min , kept for 5h, then cooled to room temperature, the nitrogen flow rate in the whole process was 500mL / min, and the black residue was the calcium salt-porous biochar composite material.

Embodiment 3

[0046] The present embodiment provides the preparation method of calcium salt-porous biomass charcoal composite material, comprises the following steps:

[0047] 1) Weigh a certain amount of soybean straw powder into a beaker, add water until the solid-to-liquid ratio is 500g / L, put it into a hydrothermal reaction kettle, heat at 300°C for 1 hour, take it out after cooling, and dry it in an oven at 7°C to obtain soybeans Straw hydrothermal charcoal.

[0048] 2) Take 6g of soybean straw hydrothermal charcoal, mix it with 36g of calcium carbonate powder (the mass ratio of calcium carbonate to agricultural and forestry waste is 6:1), put it in a corundum crucible, heat up to 900°C at 10°C / min, Keep it for 0.5h, then cool down to room temperature, the nitrogen flow rate in the whole process is 50mL / min, and the black residue is the calcium salt-porous biochar composite material.

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Abstract

The invention discloses preparation and application of a heavy metal contaminated acid soil remediation-improvement material, and belongs to the technical field of environmental science and engineering. Calcium carbonate and agricultural and forestry waste subjected to hydrothermal treatment are mixed and subjected to high-temperature anaerobic carbonization to form a calcium salt-porous biomass charcoal compound, the calcium salt-porous biomass charcoal compound is applied to soil, and meanwhile the functions of efficiently improving the pH of the soil and passivating bioavailable heavy metals are achieved. After the compound is added into the soil, the compound can slowly release calcium salt, the pH of the soil is continuously increased, and a calcium element is provided; the porous biomass charcoal has a developed pore structure, and bioavailable heavy metals in the soil are passivated through pore filling and other effects; the porous biomass charcoal improves the content of organic matters, improves acid soil, and avoids potential negative effects such as soil hardening and element balance imbalance caused by calcium salt; compared with traditional biomass charcoal, the porous biomass charcoal is more stable, and can passivate soil heavy metals and improve acid soil for a long time.

Description

technical field [0001] The invention relates to the field of environmental science and engineering technology, and more specifically relates to the preparation and application of a remediation-improvement material for acidic soil polluted by heavy metals. Background technique [0002] Acidic soil refers to the soil with pH<6.6 in the plow layer. It is mostly distributed in tropical and subtropical regions with high temperature and rainy seasons. Leaching. In addition, with the acceleration of the global industrialization process, a large amount of acid gases (sulfur dioxide and nitrogen oxides, etc.) are continuously emitted into the atmosphere and deposited into the soil to accelerate the soil acidification process. According to statistics, acidic soil accounts for about 50% of the world's arable soil. In my country, red soil is a typical acidic soil, mainly distributed in Jiangxi and Hunan provinces, covering about 56.9 million hectares of farmland 2 . Acidic soil ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/06C09K109/00
CPCC09K17/06C09K2109/00
Inventor 程虎纪荣婷韩建刚张柳梦吴雅瑞
Owner NANJING FORESTRY UNIV