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Method for Improving Cd Adsorption and Fixation Capacity of Corn Stalk Biochar through Abdominal Transformation

A corn stalk, adsorption and fixation technology, applied in the field of agricultural waste recycling and soil heavy metal passivation restoration, can solve the problems of large energy consumption, high moisture content, large biomass of straw, etc., to reduce biomass and energy consumption , Improve the effect of adsorption and fixation capacity

Active Publication Date: 2021-04-16
SICHUAN AGRI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology cannot make full use of nutrients such as protein, amino acids, and sugars in straw. At the same time, due to the large biomass and high moisture content of straw, a large amount of energy is consumed in the process of biochar preparation.

Method used

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  • Method for Improving Cd Adsorption and Fixation Capacity of Corn Stalk Biochar through Abdominal Transformation
  • Method for Improving Cd Adsorption and Fixation Capacity of Corn Stalk Biochar through Abdominal Transformation
  • Method for Improving Cd Adsorption and Fixation Capacity of Corn Stalk Biochar through Abdominal Transformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Transabdominal transformation of corn stalks: Take fresh corn stalks, cut them into 2-3cm uniform pieces, mix them with 0.1% salt, and feed them to cattle as the only feed for more than 4 days.

[0024] (2) Cow dung collection and treatment: start to collect cow dung from the second day of feeding, and collect continuously for more than 3 days. The collected cow dung is air-dried at room temperature, and the water content is controlled at 15-20%.

[0025] (3) Preparation of biochar: put the above-mentioned dried cow dung into a crucible, put it into an oven, bake at 65-70°C for 22-24 hours, and control the water content at 4-8%. Then the dried cow dung was put into the muffle furnace, and biochar was prepared by one-step slow pyrolysis. The pyrolysis condition is to raise the temperature to 600°C or 700°C at 20°C / min in a nitrogen atmosphere, and then cool down to room temperature naturally after 3 hours of pyrolysis. Take out the product, grind it through a 40-mes...

Embodiment 2

[0031] (1) Transabdominal transformation of corn stalks: Take fresh corn stalks, cut them into 2-3cm uniform pieces, mix them with 0.1% salt, and feed them to cattle as the only feed for more than 4 days.

[0032] (2) Cow dung collection and treatment: start to collect cow dung from the second day of feeding, and collect continuously for more than 3 days. The collected cow dung is air-dried at room temperature, and the water content is controlled at 15-20%.

[0033] (3) Preparation of biochar: put the above-mentioned dried cow dung into a crucible, put it into an oven, bake at 65-70°C for 22-24 hours, and control the water content at 4-8%. Then the dried cow dung was put into the muffle furnace, and biochar was prepared by one-step slow pyrolysis. The pyrolysis condition is to raise the temperature to 600°C or 700°C at 20°C / min in a nitrogen atmosphere, and then cool down to room temperature naturally after 3 hours of pyrolysis. Take out the product, grind it through a 40-mes...

Embodiment 3

[0037] (1) Transabdominal transformation of corn stalks: Take fresh corn stalks, cut them into 2-3cm uniform pieces, mix them with 0.1% salt, and feed them to cattle as the only feed for more than 4 days.

[0038] (2) Cow dung collection and treatment: start to collect cow dung from the second day of feeding, and collect continuously for more than 3 days. The collected cow dung is air-dried at room temperature, and the water content is controlled at 15-20%.

[0039](3) Preparation of biochar: put the above-mentioned dried cow dung into a crucible, put it into an oven, and bake it at 65-70° C. for 22-24 hours, and control the water content at 4-8%. Then the dried cow dung was put into the muffle furnace, and biochar was prepared by one-step slow pyrolysis. The pyrolysis condition is to raise the temperature to 600°C or 700°C at 20°C / min in a nitrogen atmosphere, and then cool down to room temperature naturally after 3 hours of pyrolysis. Take out the product, grind it through ...

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Abstract

The invention discloses a method for improving corn stalk biochar cadmium adsorption and fixation capacity by transabdominal transformation. Fresh corn stalks are mixed with 0.1% salt, and cattle are fed with the only feed, and cow dung excreted by cattle is collected through transabdominal transformation and dried. After drying, put it into a muffle furnace, control the heating rate at 20°C / min under a nitrogen atmosphere, and pyrolyze at 600-700°C for 3 hours to prepare biochar. Through abdominal transformation of cattle, the properties of biochar were significantly changed, the maximum adsorption capacity of cadmium was 161.2-175.4mg / g, and the biochar prepared by abdominal transformation increased the fixation ability of soil cadmium by 45.1-47.2%. This method has the remarkable characteristics of low energy consumption and good quality, which not only realizes the multi-level recycling of corn straw resources, but also provides a good repair material for the passivation restoration of cadmium-contaminated soil.

Description

technical field [0001] The invention relates to the fields of agricultural waste recycling and soil heavy metal passivation restoration, in particular to a method for improving the adsorption and fixation capacity of corn stalk biochar and cadmium through abdominal transformation. Background technique [0002] The situation of heavy metal pollution in soil in my country is serious, which seriously threatens the safety of agricultural products and human health. It is very urgent to repair heavy metal-contaminated soil. The in-situ passivation restoration technology for soil heavy metal pollution has the advantages of low cost, simple operation, quick effect, and suitable for large-scale pollution control, and has attracted much attention in soil remediation applications. The key to in-situ passivation repair of heavy metals lies in the development of passivators, whose raw materials are mainly calcareous substances, clay ores, phosphorus-containing materials and organic ferti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C09K17/04
CPCB01J20/20B01J20/3078B01J2220/4887C09K17/04
Inventor 陶琦王昌全谢云波郭凌珂陈艺璇赵俊雯陈玉蓝李冰李启权
Owner SICHUAN AGRI UNIV
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