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Preparation and using method for in-situ remediation agent for PCBs contaminated soil 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: 2017-06-23
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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  • Preparation and using method for in-situ remediation agent for PCBs contaminated soil based on waste biomass
  • Preparation and using method for in-situ remediation agent for PCBs contaminated soil based on waste biomass
  • Preparation and using method for in-situ remediation agent for PCBs contaminated soil 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 for use; PCBs contaminated soil was taken from the waste capacitor storage site. After the soil samples were dried in a fume hood for 24 hours, the leaves, plant rhizomes and stones were removed from the soil samples. The samples were stored in an aluminum foil sample bag protected from light (the chlorine content in the soil is 8.26%, and all are in the form of organic chlorine).

[0026] 2. Preparation of repair agent

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

[0028] 2) The mixture is added to the hydrothermal reactor and the reactor is heated to 200°C for 60 minutes of hydrothermal treatment.

[0029] 3) Perform solid-liquid separation after cooling to room temperature, and dry the obtained solid p...

Embodiment 2

[0043] In addition to using rice stalks as biomass as raw materials;

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

Embodiment 3

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

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

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

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

[0050]

[0051] It can be seen from Table 1 that the repair agent prepared by the present invention can achieve 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 repair The agent is prepared with waste biomass as raw material, so it has the characteristics of green, environmental protection, and low price...

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Abstract

Combined with the current situations of serious contamination of soil PCBs and a huge quantity of waste biomass in China, the invention discloses a novel technology suitable for preparing an environmental-friendly in-situ remediation agent for PCBs contaminated soil with the waste biomass serving as raw materials. The novel technology comprises the following steps that (1) the biomass, water and ferric salts are mixed and subjected to hydrothermal coprocessing to prepare iron-loaded hydrothermal carbon; and (2) the iron-loaded hydrothermal carbon is obtained after high temperature heat treatment. The in-situ remediation agent for the PCBs contaminated soil is prepared with the waste biomass serving as a carbon source, the preparation process is simple, rapid and efficient dechlorination degradation of PCBs in the soil can be realized, and the remediation agent has the characteristics of environmental protection, low price and the like.

Description

Technical field [0001] The invention relates to the treatment and disposal of waste biomass, belongs to a new technology of solid waste resource utilization in the field of environmental protection and comprehensive utilization of resources, and is particularly suitable for the high value-added resource utilization of waste biomass such as a huge amount of straw. Background technique [0002] PCBs are a typical persistent organic pollutants (POPs) that can accumulate, concentrate and amplify through the biological chain and enter animals and human bodies, and cause damage to the skin, liver, gastrointestinal system, nervous system, reproductive system, and immune system. Even cancer has an inducing effect. The acute toxicity of PCBs is very low, but if humans are exposed to a low-dose environment for a long time, it may cause proliferative reactions, endocrine disorders, liver poisoning, reproductive system poisoning and carcinogenesis. Social hazards have been formed in industr...

Claims

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Application Information

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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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