Modified biochar and method for repairing heavy metal pollution of soil by using modified biochar

A technology for repairing soil and biochar, which is applied in botany equipment and methods, restoration of polluted soil, non-metallic elements, etc. It can solve the problem of limited adsorption capacity of heavy metals, small specific area and pore volume, and poor soil restoration effect, etc. problems, to achieve the effect of enriching oxygen-containing functional groups, large specific area, and strong pollutant adsorption capacity

Pending Publication Date: 2021-10-15
江苏苏环生态科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption of heavy metals by biochar mainly depends on the specific area and pore volume, but the specific area and pore volume of the existing biochar are small, resulting in limited adsorption capacity for heavy metals and poor soil restoration effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A modified biophaco, prepared from the following method:

[0039] S1, dry the corn straw;

[0040] S2, crushing corn straw to get straw powder, straw powder over 0.8cm screen;

[0041] S3, stir the stirring of straw powder, so that the water content of straw powder is 20%;

[0042] S4, send straw powder into the charcoal furnace, close the carbonization furnace;

[0043] S5, the carbon dioxide gas is introduced, and the air in the carbonifination furnace is purified;

[0044] S6, the temperature rise rate is 5 ° C / min, rises to 100 ° C, and heat it for 15 min;

[0045] S7, the temperature rises to the carbonization temperature, the temperature rise rate is 10 ° C / min, the carbonization temperature is 680 ° C, carbonization time 2 h, to obtain modified bio;

[0046] S8, after the carbonization is completed, then the carbon dioxide gas is transferred at the time of cooling, and when the temperature drops below 600 ° C, the gas supply is stopped;

[0047] S9, the modified ...

Embodiment 2

[0049] A modified biophaco, prepared from the following method:

[0050] S1, dry the corn straw;

[0051] S2, crushing corn straw to get straw powder, straw powder over 1 cm screen;

[0052] S3, stir the stirring of straw powder, so that the water content of straw powder is 25%;

[0053] S4, send straw powder into the charcoal furnace, close the carbonization furnace;

[0054] S5, the carbon dioxide gas is introduced, and the air in the carbonifination furnace is purified;

[0055] S6, the temperature rise rate is 8 ° C / min, raised to 100 ° C, and heat insulation 25min;

[0056] S7, the temperature rises to the carbonization temperature, the temperature rise rate is 20 ° C / min, the carbonization temperature is 700 ° C, and the carbonization time is 1.5 h, and the modified bio;

[0057] S8, after the carbonization is completed, then the carbon dioxide gas is transferred at the time of cooling, and when the temperature drops below 600 ° C, the gas supply is stopped;

[0058] S9,...

Embodiment 3

[0060] A modified biophaco, prepared from the following method:

[0061] S1, dry the corn straw;

[0062] S2, crushing corn straw to get straw powder, straw powder over 1 cm screen;

[0063] S3, stir the stirring of straw powder, so that the water content of straw powder is 30%;

[0064] S4, send straw powder into the charcoal furnace, close the carbonization furnace;

[0065] S5, the carbon dioxide gas is introduced, and the air in the carbonifination furnace is purified;

[0066] S6, the temperature rise rate is 10 ° C / min, raised to 100 ° C, and heat the temperature for 30 min;

[0067] S7, the temperature rises to the carbonization temperature, the temperature rise rate is 20 ° C / min, the carbonization temperature is 750 ° C, and the carbonization time is 1 h, and the modified bio;

[0068] S8, after the carbonization is completed, then the carbon dioxide gas is transferred at the time of cooling, and when the temperature drops below 600 ° C, the gas supply is stopped;

[...

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Abstract

The invention relates to biochar, in particular to modified biochar and a method for repairing heavy metal pollution of soil by using the modified biochar. The modified biochar is prepared by the following method: S1, air-drying corn straws; s2, crushing the corn straws to obtain straw powder; s3, adding water into the straw powder, and stirring until the water content of the straw powder is 20-30%; s4, feeding the straw powder into a carbonization furnace, and closing the carbonization furnace; s5, introducing carbon dioxide gas, and emptying air in the carbonization furnace; s6, increasing the temperature to 100 DEG C, and performing heat preservation for 15-30 min; s7, increasing the temperature to the carbonization temperature, wherein the carbonization temperature ranges from 680 DEG C to 750 DEG C, the carbonization time ranges from 1 h to 2 h, and obtaining the modified biochar; s8, cooling to room temperature after carbonization is finished; and S9, heating the modified biochar into a ball mill, and grinding to obtain the modified biochar powder with the particle size of 10-20nm. The modified biochar has larger specific area and pore volume, richer oxygen-containing functional groups and stronger pollutant adsorption capacity.

Description

Technical field [0001] The present invention relates to a method of biocompancing, especially a modified bio-carbon and its repairing soil heavy metal contamination. Background technique [0002] Biochar is also known as biomass carbon, refers to a class of carbon-containing, stable, highly aromatic solid substances obtained by bracing under hypoxic or aerobic conditions. [0003] The raw material of biocompatient is low, the source is wide, and the commonly used raw materials are most organic waste, which can be divided into three categories of farmers, industrial and domestic garbage. Agricultural animal waste has straw scales, poultry livestock, green garbage, wood chip bark, grape seed, husk, rice bran, sugar cane, etc., industrial waste has a lidin, sludge, paper mill pulp, leather waste, etc. Garbage has kitchen garbage, food packaging waste, etc. Biochacoal has a highly aromatic structure containing a large amount of phenolic hydroxyl group, a carboxyl group, and a carbony...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/336B01J20/20B09C1/08B09C1/00A01G13/02C09K17/52C09K101/00
CPCC01B32/324C01B32/336B01J20/20B09C1/08B09C1/00A01G13/0275C09K17/52B09C2101/00C09K2101/00Y02A40/28
Inventor 史虹田崇新陈洁王玺琦
Owner 江苏苏环生态科技有限公司
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