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Method for restoring polycyclic aromatic hydrocarbon contaminated soil by charcoal

A technology for polluted soil and polycyclic aromatic hydrocarbons, applied in the field of polluted soil remediation, can solve the problems of no relevant research reports, secondary pollution, affecting the remediation effect, etc., and achieves low management requirements, soil fertility can be improved, and the operation process is simple. Effect

Inactive Publication Date: 2010-01-06
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although microbial remediation has achieved satisfactory remediation results under artificially simulated pollution conditions or in the laboratory, the remediation of natural polluted sites cannot achieve the expected purpose due to various reasons.
Phytoremediation also has certain limitations: plants have different tolerance or accumulation of PAHs, and a plant can only eliminate one or several PAHs; and phytoremediation must provide the necessary environmental conditions for plant growth. Soil fertility, water content, texture, salinity, pH and climatic conditions have high requirements, but the soil environment is complex, so it often affects the efficiency of phytoremediation. At the same time, natural disasters such as pests and diseases, floods, etc. will also affect the restoration effect; in addition, Improper disposal of harvested parts of plants will also cause secondary pollution to a certain extent
However, there are no relevant research reports on the preparation of biochar from livestock and poultry manure and the use of biochar prepared from livestock and poultry manure to remove PAHs in polluted soil.

Method used

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  • Method for restoring polycyclic aromatic hydrocarbon contaminated soil by charcoal
  • Method for restoring polycyclic aromatic hydrocarbon contaminated soil by charcoal
  • Method for restoring polycyclic aromatic hydrocarbon contaminated soil by charcoal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Using chicken manure as a raw material, the chicken manure was retrieved from the chicken factory, dried, and stored for later use. Put the dried chicken manure in a high-temperature-resistant airtight container, heat it at 400°C for 5 hours under anaerobic conditions, and cool it down to room temperature naturally. The soil was collected from PAHs-contaminated soil around Sanming Iron and Steel Plant in Fujian Province. After the soil is taken back, clean up debris, grass roots and other sundries, pass through a 5mm soil sieve, put into cultivation tanks, 4kg per tank, crush the prepared chicken manure biochar into 2mm particles, and mix it with the polluted soil according to the ratio of 3%. Mix evenly, treat under natural conditions for 170 days, and keep the soil water content between 12-15% during the treatment. After the treatment, the PAHs content was determined. The samples were pretreated by Soxhlet extraction method, and the content of PAHs was...

Embodiment 2

[0022] Embodiment 2: Utilize duck manure as raw material, take back duck manure from duck farm, dry, store for later use. Put the dried duck manure in a high-temperature-resistant airtight container, heat it at 450°C for 4.5 hours under anaerobic conditions, and cool it down to room temperature naturally. The soil was collected from PAHs-contaminated soil around Sanming Iron and Steel Plant in Fujian Province. After the soil is taken back, clean up debris, grass roots and other sundries, pass through a 5mm soil sieve, put into cultivation tanks, 4kg per tank, crush the prepared chicken manure biochar into 5mm particles, and mix it with the polluted soil according to the ratio of 6%. Mix evenly, treat under natural conditions for 170 days, and keep the soil water content between 13-17% during the treatment. After the treatment, the PAHs content was determined. The samples were pretreated by Soxhlet extraction method, and the content of PAHs was determined by GC-MS. The exper...

Embodiment 3

[0025] Embodiment 3: Using pig manure as a raw material, take back the pig manure from the pig farm, dry it, and store it for later use. Put the dried pig manure in a high-temperature-resistant airtight container, heat it at 500°C for 4 hours under anaerobic conditions, and cool it down to room temperature naturally. The soil was collected from PAHs-contaminated soil around Sanming Iron and Steel Plant in Fujian Province. After the soil is taken back, clean up debris, grass roots and other sundries, pass through a 5mm soil sieve, put into cultivation tanks, 4kg per tank, crush the prepared pig manure biochar into 2mm particles, and mix with polluted soil at a ratio of 5%. Mix evenly, treat under natural conditions for 150 days, and keep the soil water content between 10-13% during the treatment. After the treatment, the PAHs content was determined. The samples were pretreated by Soxhlet extraction method, and the content of PAHs was determined by GC-MS. The experimental res...

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Abstract

The invention discloses a method for restoring polycyclic aromatic (PAHs) polluted soil by charcoal which is prepared by livestock and poultry manure and belongs to the field of polluted soil restoration. The method comprises the following steps: preparing charcoal by using livestock and poultry manure output by a livestock and poultry plant by a thermal cracking method under the conditions of oxygen deficiency and high temperature of 350-600 DEG C; crushing the prepared charcoal into grains of 2-8mm; mixing the charcoal and polluted soil sufficiently in proportion of 0.5-10 percent; maintaining the water content of soil from 10 to 17 percent; and processing the mixture for 30-300 days to remove various PAHs in the soil. The method for restoring polycyclic aromatic (PAHs) polluted soil by charcoal not only can be used for processing PAHs polluted soil in different places, but also can be used for restoring the land on site.

Description

Technical field: [0001] The invention relates to a method for remediating soil polluted by polycyclic aromatic hydrocarbons (PAHs) by using biochar prepared from livestock and poultry manure, and the PAHs are 16 priority controlled PAHs compounds specified in US EPA 610. The method specifically uses the organic waste produced by the livestock and poultry breeding industry-livestock manure to prepare a biochar material, and then adds the biochar to the polluted soil to remove PAHs, which belongs to the field of polluted soil remediation. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) refer to compounds in which two or more benzene rings are connected in the form of fused or non-fused rings. PAHs are ubiquitous in the environment, with a large number, many types, and a wide distribution. Most of them have strong carcinogenicity and mutagenicity, and also have the effect of environmental hormones. 70% to 90% of human and animal cancers are caused by chem...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 蔡超郭明新陈少华俞慎朱永官
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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