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Hydrothermal carbon based heavy metal contaminated soil in-situ remediation agent and preparation method thereof

A technology of in-situ remediation agent and polluted soil, which is applied in the field of waste biomass treatment and disposal, and can solve the problems of low efficiency and long time of soil in-situ remediation agent

Pending Publication Date: 2017-08-04
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

[0003] The present invention aims at the serious soil heavy metal pollution in our country, the existing heavy metal polluted soil in-situ remediation agent has low efficiency and long time, and combines the advantages of rich waste biomass resources in our country, and establishes a method for preparing hydrothermal charcoal by using waste biomass as raw material. A new technology of in-situ remediation agent for heavy metal-contaminated soil

Method used

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  • Hydrothermal carbon based heavy metal contaminated soil in-situ remediation agent and preparation method thereof
  • Hydrothermal carbon based heavy metal contaminated soil in-situ remediation agent and preparation method thereof
  • Hydrothermal carbon based heavy metal contaminated soil in-situ remediation agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Material preparation

[0025] The pig manure was dried and crushed to less than 5mm, and set aside. Soil samples include actual polluted soil and simulated polluted soil, in which simulated polluted soil is prepared by adding target pollutants Cd and Pb to uncontaminated soil (Cd and Pb concentrations are 5mg / kg and 1000mg / kg respectively); actual polluted soil The concentrations of Cd and Pb were 7.2mg / kg and 346mg / kg respectively.

[0026] 2. Preparation of restoration agent

[0027] 1) Mix pig manure (dry basis) with water at a ratio of 1:5 and put it into a hydrothermal reactor.

[0028] 2) Heating the reactor to 200°C and maintaining it for 60 minutes; then cooling by an electric fan and internal circulating cooling water, and then performing solid-liquid separation to obtain hydrothermal charcoal;

[0029] 3) Hydrothermal charcoal and quicklime were mixed in a ratio of 4:1, and mechanically stirred for 2 hours to obtain the in-situ remediation agent for heav...

Embodiment 2

[0047] In addition to using corn stover instead of pig manure.

[0048] In the repairing agent preparation step 2), the rest is the same as that of Example 1, except for the treatment at 220° C. for 80 minutes.

[0049] Influence of remediation agent on heavy metals available to plants in soil Steps are the same as in Example 1 except that 5% remediation agent is put into the soil in 1).

[0050] The analysis results are shown in Table 1 and Table 2.

Embodiment 3

[0052] In addition to using kitchen waste instead of pig manure.

[0053] In the preparation steps of the restorative agent, 1) mix kitchen waste (dry basis) and water at a ratio of 1:5;

[0054] In the passivation of the heavy metals in the soil by the remediation agent, except that 7% of the remediation agent was added in 1), the rest was the same as in Example 1.

[0055] Influence of the remediation agent on the heavy metals available to plants in the soil Steps are the same as in Example 1 except that 1) 15% of the remediation agent is put into the soil.

[0056] The analysis results are shown in Table 1 and Table 2.

[0057] Table 1 Passivation of heavy metals in soil by remediation agents.

[0058]

[0059] Table 2 Analysis results of heavy metals in mustard roots and stems and leaves.

[0060]

[0061] It can be seen from Table 1 that the simultaneous high-efficiency passivation of two heavy metals in the polluted soil is achieved by adding 5% of the restorati...

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Abstract

The invention establishes a new technology for preparing an environment-friendly hydrothermal carbon based heavy metal contaminated soil in-situ remediation agent by taking a waste biomass as a raw material, on the basis of the current situations of serious heavy metal pollution of soil and a large amount of rural waste biomass in China. The technology comprises the following steps: 1) hydrothermally treating the waste biomass and converting into hydrothermal carbon and 2) adding a certain amount of quick lime into the hydrothermal carbon and fully mixing. The hydrothermal carbon based heavy metal contaminated soil in-situ remediation agent prepared from the waste biomass disclosed by the invention can simultaneously realize the efficient in-situ passivation for various heavy metals in soil and can effectively block the paths of the heavy metals entering into the crops. The remediation agent has the characteristics of green, environmental protection, low cost, and the like.

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 field of environmental protection and comprehensive utilization of resources, and is especially suitable for the high added value of waste biomass such as straw, livestock and poultry manure, kitchen waste, etc. resource utilization. Background technique [0002] A large number of waste residues discharged by industrial and mining enterprises, sewage irrigation from agricultural production activities, and livestock and poultry breeding have caused serious heavy metal pollution in my country's farmland and cultivated soil. Food safety problems such as "cadmium rice" and "heavy metal vegetables" caused by polluted farmland seriously threaten human health. At present, the in-situ remediation of heavy metal-contaminated cultivated soil in engineering applications mainly adopts phytoremediation methods, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06
CPCC09K17/06
Inventor 刘振刚盖超
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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