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Biochar and application thereof in treatment of pollution of polycyclic aromatic hydrocarbons in soil

A polycyclic aromatic hydrocarbon and biochar technology, applied in the field of contaminated soil remediation, can solve the problems of unpredictable PAHs removal efficiency, secondary soil pollution, etc., and achieve the effects of strong PAHs affinity, huge application potential, and strong polarity.

Inactive Publication Date: 2019-04-12
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent "A Method for Remediating Polycyclic Aromatic Hydrocarbon-Contaminated Soil Using Biochar (200910157237.X)" discloses a method for remediating polycyclic aromatic hydrocarbon-contaminated soil using biochar prepared from livestock manure, and specifically discloses that the livestock manure is chicken Manure, duck manure and pig manure, soil PAHs reduced by 44% after chicken manure biochar treatment, 48% reduction in soil PAHs treated with duck manure biochar, 40% reduction in soil PAHs treated with chicken manure biochar, However, in the soil treated by this patent, the concentration of PAHs added is too high, and the concentration of PAHs is significantly higher than the PAHs in the actual soil. The higher the content of PAHs, the better the adsorption effect of biochar. The biochar simulated in the patent removes aroma The efficiency of hydrocarbons cannot predict the removal efficiency of PAHs in real soil. The content of biochar background PAHs prepared by the materials and preparation methods described in the patent may exceed the safety limit, which will lead to secondary pollution of the soil

Method used

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  • Biochar and application thereof in treatment of pollution of polycyclic aromatic hydrocarbons in soil
  • Biochar and application thereof in treatment of pollution of polycyclic aromatic hydrocarbons in soil
  • Biochar and application thereof in treatment of pollution of polycyclic aromatic hydrocarbons in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Preparation of Cow Dung Biochar

[0039] Select cow dung, a characteristic agricultural and animal husbandry waste in Lanzhou, as the raw material for biochar: dry the cow dung, crush and grind it through a 60-mesh nylon sieve, and wait for burning. Put the sieved cow dung into a porcelain crucible, wrap it with a cover, put it into a muffle furnace, burn it at 300°C, 400°C, 500°C, and 600°C for 6 hours, cool it to room temperature, take it out and store it in a desiccator spare.

Embodiment 2

[0040] Example 2 Preparation of sheep dung biochar

[0041] Select sheep manure, a characteristic agricultural and animal husbandry waste in Lanzhou, as the raw material for biochar: dry the sheep manure, crush and grind it through a 60-mesh nylon sieve, put the sieved sheep manure into a porcelain crucible, wrap it with a cover, and put it into a muffler Furnace, fired at 300°C, 400°C, 500°C, 600°C for 6 hours, cooled to room temperature, took it out and stored it in a desiccator for later use.

Embodiment 3

[0042] Example 3 Preparation of wheat straw biochar

[0043] The characteristic agricultural and animal husbandry waste in Lanzhou was selected as the raw material of biochar: the wheat straw was washed and cut into 5cm pieces, and put into an oven for drying, wherein the temperature of the oven was controlled at 80°C; the dried wheat The straw was crushed and ground through a 60-mesh nylon sieve, and the sieved wheat straw was put into a porcelain crucible, covered and wrapped, then put into a muffle furnace, fired at 300°C, 400°C, 500°C, and 600°C for 6 hours, and cooled to After room temperature, take it out and store in a desiccator for later use.

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PUM

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Abstract

The invention belongs to the field of contaminated soil remediation, and particularly relates to a biochar which is prepared by sintering biological materials such as sheep manure, cow dung, wheat straw and peanut shells and application of the biochar in treatment of pollution of polycyclic aromatic hydrocarbons (PAHs) in soil. The biochar is prepared by the following method: (1) drying the biological materials at 80 DEG C, and conducting pulverizing and sieving; (2) placing the biological materials processed in the step (1) into a porcelain crucible, conducting covering wrapping, and then putting the porcelain crucible into a muffle furnace for firing at a firing temperature of 300-600 DEG C for 6 h; and (3) cooling fired biochar to room temperature, and placing the cooled biochar in a desiccator for storage. The biochar provided by the invention has strong affinity and adsorption capacity for PAHs, has a low content of polycyclic aromatic hydrocarbons in the background, and can be used for eliminating pollution of polycyclic aromatic hydrocarbons in soil with a huge application potential.

Description

technical field [0001] The invention belongs to the field of contaminated soil remediation, and in particular relates to biochar fired from biological materials such as sheep dung, cow dung, wheat straw, peanut shells and the like and its application in remediating polycyclic aromatic hydrocarbons (PAHs) pollution in soil. Background technique [0002] In recent years, with the continuous intensification of industrial modernization and the improvement of people's living standards, the discharge of organic pollutants produced in the production and living process to the environment has continued to increase, which has seriously affected the quality of the terrestrial ecosystem, especially the soil environment. Impact. As a typical class of persistent organic pollutants, polycyclic aromatic hydrocarbons (PAHs) are toxic, persistent, and bioaccumulative. pose certain health risks. Water resources are in short supply in the arid area of ​​Northwest China, and a large amount of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00C10B53/02
CPCB09C1/00C10B53/02Y02E50/10
Inventor 高宏
Owner LANZHOU UNIVERSITY