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A remediation method for cohesive soil in heavy metal-contaminated sites with high load

A cohesive soil and repair method technology, applied in the restoration of polluted soil, removal of solid waste, etc., to achieve a high degree of waste treatment, conducive to ecological restoration, and strong universality

Inactive Publication Date: 2016-05-25
INST OF SOIL SCI CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies in the technical methods for remediating cohesive soil polluted by heavy metals on the site with high loads in the prior art, and the technical problem of low efficiency in applying the leaching technology to cohesive soils, the present invention provides a method for remediating cohesive soils polluted by heavy metals with high loads, It is proposed to use waste incineration slag to modify cohesive soil to solve the applicability of leaching technology, use landfill leachate (including leachate and leachate) to prepare mild and environmentally friendly leaching agent, and use domestic sewage Plant sludge to prepare phosphorus-rich biochar, coupled with leaching and in-situ passivation technology to achieve risk control of heavy metals in soil

Method used

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Examples

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Embodiment 1

[0042] A kind of repairing method of cohesive soil of heavy metal polluted site with high load of the present embodiment, its specific steps are:

[0043] Step 1. Modification of contaminated soil

[0044] Preparation of slag powder: The slag was taken from a municipal solid waste incineration plant in East China. After aging for 30 days at room temperature, fine slag particles with a particle size of less than 5 mm were obtained by sieving; 0.05 mol / L hydrochloric acid was added to the It was pickled twice, each time for 10 minutes, then washed with water until neutral, dried and crushed to obtain slag powder;

[0045] Taking an electroplating site in East China as an example, the results of site investigation and risk assessment show that the type of contaminated soil is yellow-brown soil, and the main pollutants are heavy metals Cr and Ni; Stir and crush the soil with a crushing bucket so that more than 90% of the soil particles have a particle size of less than 2cm. After...

Embodiment 2

[0057] A kind of repairing method of cohesive soil of heavy metal polluted site with high load of the present embodiment, its specific steps are:

[0058] Step 1. Modification of contaminated soil

[0059] Preparation of slag powder: The slag was taken from a municipal solid waste incineration plant in central China, aged for 30 days at room temperature and sieved to obtain slag particles with a particle size of less than 5mm; 0.05mol / L of The slag particles are pickled twice with hydrochloric acid, each time for 20 minutes, then washed with water until neutral, dried and crushed to obtain slag powder, the particle size of the slag powder is between 0.05 and 2mm;

[0060] Taking a non-ferrous metal smelting site in central China as an example, the site investigation and risk assessment results show that the type of contaminated soil is red soil, and the main pollutants are heavy metals Cd, Cu, Pb and Zn; the contaminated soil is excavated in situ in the area to be restored , ...

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Abstract

The invention discloses a method for restoring clayed soil of a high-load heavy metal polluted site, belonging to the technical field of site pollution control and restoring. The method comprises the following steps: step I, modified treatment of polluted soil; preparing slag powder, adding water into a mixture of clay particles and slag powder with dry basis mass ratio of 1:(1-4), mixing uniformly, aging and curing for 7-15d to obtain the modified polluted soil; step II, preparation of leacheate A and leacheate B; adding the leacheate A and the leacheate B sequentially for leaching the modified polluted soil in the step I twice, and collecting the polluted soil and the leacheate respectively after solid-liquid separation; and step III, passivating stabilization improvement; and preparing phosphorous-enriched charcoal powder, mixing the charcoal powder with the leached soil in the step II, adding water, stirring uniformly, aging and curing for 7-20d to achieve the soil restoring process. The method comprehensively utilizes wastes and waste liquid, modified materials, leacheate and a passivator, the preparation process is environmentally friendly and has low soil environmental disturbance, and the method facilitates the ecological restoration of the soil.

Description

technical field [0001] The invention relates to the technical field of site pollution control and restoration, and more specifically, relates to a restoration method for cohesive soil on a site polluted by heavy metals with a high load. Background technique [0002] Site soil pollution derived from high-speed, continuous, and extensive industrial processes is obviously different from other pollution types, showing relatively concentrated polluted areas but large spatial variability, heavy pollution loads, and pollutants with significant industrial characteristics. Heavy metals are a common pollutant in the soil of the site. The control technologies for heavy metal pollution in soil at home and abroad can be generally divided into two categories: one is to reduce hazards and risks by changing the occurrence of heavy metals in the soil. Or combined with the soil to stabilize it in the soil, thereby reducing its activity, toxicity, migration and bioavailability in the environme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09B3/00
Inventor 吴骏张后虎李春平韩璐晏井春陈梦舫
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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