Method for preparing compound contaminated-soil in-situ repairing agent with abandoned biomass

A technology of waste biomass and in-situ remediation agent, applied in the restoration of polluted soil, etc., can solve the problems of complex soil pollution, low efficiency, and expensive in-situ remediation agent for complex polluted soil, and achieve environmental friendliness and low cost Effect

Inactive Publication Date: 2017-07-21
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current situation that the existing in-situ remediation agent for composite polluted soil is expensive, low in efficiency and serious soil composite pollution, combined with the adv

Method used

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  • Method for preparing compound contaminated-soil in-situ repairing agent with abandoned biomass
  • Method for preparing compound contaminated-soil in-situ repairing agent with abandoned biomass
  • Method for preparing compound contaminated-soil in-situ repairing agent with abandoned biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Material preparation

[0022] Crush the corn stalks to less than 5mm and set aside. PAHs (Σ2-ring PAHs 5261μg / kg; Σ3-ring PAHs 9220μg / kg; Σ4-ring PAHs 17301μg / kg; Σ5-ring PAHs 592μg / kg 5; Σ6-ring PAHs 2966μg / kg) and Cd (7.6mg / kg) pollution The soils were all taken from actual polluted soils (PAHs-contaminated soils were taken from coking plants; Cd-contaminated soils were taken from chemical smelters). After the soil samples were dried in a fume hood for 24 hours, the leaves, plant roots, and stones were removed, crushed, passed through a 2mm sieve, and stored in the dark.

[0023] 2. Preparation of restoration agent

[0024] 1) Mix corn stalks (dry basis), quicklime, and water in a ratio of 4:1:20, then mechanically stir for 30 minutes;

[0025] 2) After the mixture is transferred to the hydrothermal reaction kettle, seal it;

[0026] 3) Heat the reactor to 220°C for hydrothermal treatment, stop heating after 40 minutes of hydrothermal treatment, and then cool d...

Embodiment 2

[0067] In addition to using pig manure instead of straw.

[0068] In the preparation of repairing agent 3), the reactor was heated to 240°C for hydrothermal treatment, and the hydrothermal treatment time was 60 minutes, which was the same as that of Example 1.

[0069] Table 1. Effect of remediation agents on Cd in soil.

[0070]

[0071]

[0072] Table 3 Effect of remediation agent on PAHs in soil

[0073]

[0074] As can be seen from Table 1, by adding the remediation agent prepared by the present invention to the Cd polluted soil, the Cd in the soil is transformed from the exchangeable state to the carbonate binding state, and the Cd in the soil is efficiently passivated. The highest passivation rate can reach 90%.

[0075] As can be seen from Table 3, the total amount of free state and bioavailable PAHs has been greatly reduced by adding the remediation agent prepared by the present invention in polluted soil, especially the total amount of free state PAHs, the ...

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Abstract

The invention discloses a novel process for preparing an environment-friendly compound contaminated-soil in-situ repairing agent with abandoned biomass by combining the advantage of rich abandoned biomass resources in our country and the current situation that the soil combined pollution is serious in our country. According to the process, the abandoned biomass and a certain amount of quick lime are mixed and then subjected to hydro-thermal treatment under a certain condition, centrifugal solid-liquid separation is performed, and the compound contaminated-soil in-situ repairing agent is obtained. The soil repairing agent is simple in preparation process, regenerable and low in cost, the occurrence mode of heavy metal in soil can be changed, the heavy metal in the contaminated soil is efficiently passivated, and the total amount of bioavailable organic pollutants PAHs in the soil can also be remarkably lowered, in other words, efficient in-situ repairing of the organic-inorganic compound contaminated soil is achieved. The repairing agent is prepared through the abandoned biomass, and efficient in-situ repairing of the compound contaminated soil is achieved while clean recycling utilization of the abandoned biomass is achieved.

Description

[0001] technical field [0002] The invention relates to waste biomass treatment and disposal, belongs to the new technology of resource utilization of solid waste in the fields of environmental protection and comprehensive utilization of resources, and is suitable for the resource utilization of high added value of huge quantities of straw, livestock and poultry manure, etc. Background technique [0003] A large amount of waste biomass is produced in our country every year, and its untimely or incorrect treatment has caused serious environmental pollution. Straw and livestock and poultry manure have become important agricultural non-point source pollution in my country. At the same time, due to the sewage irrigation of agricultural production and life, the unreasonable use of agricultural inputs such as chemical fertilizers, pesticides, and agricultural films, and livestock and poultry breeding, the complex pollution of farmland soil (heavy metals, organic pollutants) is very...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 刘振刚盖超
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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