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A preparation and application method of PCBS-contaminated soil in-situ remediation agent based on waste biomass

A technology of waste biomass and in-situ remediation agent, which is applied in the field of high value-added resource utilization of waste biomass, can solve the problems of lack, low cost, and low biodegradation efficiency, so as to save production costs, reduce environmental pollution, and use simple effect

Active Publication Date: 2021-05-25
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the bioremediation method is that the strong hydrophobicity of PCBs leads to low biodegradation efficiency; in addition, there are still great difficulties in the biodegradation of PCBs substituted with high Cl
However, the cost of pyrolysis is generally high, and it is basically not suitable for the treatment of low-concentration contaminated soil.
So far, there is a lack of cheap and green in-situ remediation agents for PCBs-contaminated soil

Method used

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  • A preparation and application method of PCBS-contaminated soil in-situ remediation agent based on waste biomass
  • A preparation and application method of PCBS-contaminated soil in-situ remediation agent based on waste biomass
  • A preparation and application method of PCBS-contaminated soil in-situ remediation agent based on waste biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Preparation of raw materials

[0025] The corn stalks were crushed to less than 5mm and used for later use; the PCBs-contaminated soil was taken from the storage point of discarded capacitors. The soil samples were dried in a fume hood for 24 hours, and then the leaves, plant roots, and stones were removed, and then crushed and passed through a 120-mesh sieve. The samples were stored away from light in aluminum foil sample bags (the chlorine content in the soil was 8.26%, and all of them existed in the form of organic chlorine).

[0026] 2. Preparation of restoration agent

[0027] 1) Mix the crushed straw with iron acetate, add water and stir evenly to prepare a mixed material, wherein straw (dry basis): iron acetate is mixed in a mass ratio of 5:1; the ratio of straw (dry basis) to water mass 1:5.

[0028] 2) Add the mixed materials into the hydrothermal reaction kettle and heat the reaction kettle to 200° C., and conduct hydrothermal treatment for 60 minutes.

...

Embodiment 2

[0043] In addition to using rice straw as biomass as raw material;

[0044] In the repairing agent preparation process, in addition to step 1), rice stalk (dry basis): the ratio of the mass of iron acetate is 5:1, and the ratio of rice stalk (dry basis) to water is mixed in a ratio of 1:5; step 2) Heating the reactor to 200°C for 80 minutes; Step 4) Performing thermochemical treatment at 700°C for 60 minutes, the rest is the same as in Example 1. The dechlorination effect of PCBs in soil is shown in Table 1.

Embodiment 3

[0046] In addition to using pig manure as biomass as raw material;

[0047] In the repairing agent preparation process, in addition to step 1), pig manure (dry basis): the ratio of the mass of iron acetate is 5:2, and the ratio of pig manure (dry basis) to water is 1:5; the step 2) Heating the reactor to 220° C. for 60 minutes; step 4) performing heat treatment at 600° C. for 60 minutes, the rest is the same as in Example 1.

[0048] The dechlorination effect of PCBs in soil is shown in Table 1.

[0049] Table 1. Dechlorination effect of PCBs in contaminated soil.

[0050]

[0051] It can be seen from Table 1 that the restoration agent prepared by the present invention can realize rapid and efficient in-situ degradation and dechlorination of PCBs after being added to PCBs-contaminated soil. After 60 days, the dechlorination rate of PCBs is as high as 57%, and the restoration The agent is prepared from waste biomass, so it has the characteristics of green, environmental pr...

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Abstract

Combining the serious soil PCBs pollution and the huge amount of waste biomass in my country, the present invention establishes a new process suitable for preparing an environmentally friendly PCBs-contaminated soil in-situ remediation agent using waste biomass as a raw material, including the following steps: 1) The hydrothermal co-processing of biomass, water and iron salt is carried out to prepare iron-loaded hydrothermal charcoal; 2) the iron-loaded hydrothermal charcoal is obtained after high-temperature heat treatment. The invention uses waste biomass as a carbon source to prepare a PCBs-contaminated soil in-situ remediation agent. The preparation process is simple, and not only can realize the rapid and efficient dechlorination and degradation of PCBs in soil, but also the remediation agent has the characteristics of greenness, environmental protection, and low price.

Description

technical field [0001] The invention relates to the treatment and disposal of waste biomass, which belongs to the new technology of resource utilization of solid waste in the fields of environmental protection and comprehensive utilization of resources, and is especially suitable for the resource utilization of high value-added waste biomass such as straws in large quantities. Background technique [0002] PCBs are typical persistent organic pollutants (POPs), which can be enriched, concentrated and magnified into animals and humans through the biological chain, causing lesions on the skin, liver, gastrointestinal system, nervous system, reproductive system, and immune system. Even carcinogenesis has an inducing effect. The acute toxicity of PCBs is very low, but if humans are exposed to low-dose environments for a long time, they may cause proliferative reactions, endocrine disorders, liver toxicity, reproductive system toxicity, and carcinogenesis. Social hazards have bee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10
CPCB09C1/10B09C2101/00
Inventor 刘振刚盖超
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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