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A reduction-stabilization two-stage remediation method for chromium-contaminated soil

A technology of chromium-contaminated soil and remediation method, which is applied in the field of chromium-contaminated soil reduction-stabilization two-stage remediation, which can solve the problems of long remediation period of bioremediation method, great harm to operators, and high cost of soil replacement method, so as to avoid stabilization Poor stabilization effect, enhanced stabilization effect, and improved stabilization performance

Inactive Publication Date: 2018-06-26
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these treatment technologies have certain limitations, such as the high cost of the soil replacement method; the leaching method is prone to secondary pollution and is more harmful to the operators; the reduction method can only reduce the toxicity of chromium to a certain extent; The remediation method has a long remediation cycle and slow progress, and is restricted by various environmental conditions; the stabilization / stabilization method has generally poor stabilization effects on Cr(Ⅵ) in soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, the contaminated soil of a chromium residue stacking site of a chemical plant was selected for remediation experiments. The test soil Cr(VI) concentration was 1851.5 mg / kg, and the total Cr concentration was 12251.4 mg / kg. The method of the present invention was used for remediation treatment. The steps are as follows.

[0023] 1) After the soil sample is air-dried, pick out the rocks, grass roots and other debris, break the soil particles to make the particle size less than 0.5 cm, weigh 1500 g of the contaminated soil, place it in a plexiglass container, and add it to the soil. Add reducing agent (reducing agent includes alkaline activator Ca(OH) 2 And hexavalent chromium reducing agent NaHSO 3 ), in terms of mass percentage, of which NaHSO 3 Accounted for 90%, Ca(OH) 2 Accounted for 10%. The molar ratio of the reducing agent to the Cr(Ⅵ) in the contaminated soil is 9 to make it evenly mixed with the soil. Add an appropriate amount of distilled water t...

Embodiment 2

[0030] In this example, artificially prepared contaminated soil was selected for remediation experiments, to investigate the effect of the method of the present invention in simulating the emergency treatment of sudden soil pollution accidents, and the preparation of the soil used external sources to add K 2 Cr 2 O 7 The basic situation of the contaminated soil is shown in Table 3.

[0031] Table 3 shows the basic situation of contaminated soil.

[0032] Test index

[0033] The restoration operation steps and main index test methods of this embodiment are the same as those of embodiment 1. The difference is: 1) the contaminated soil used is the above artificially prepared soil; 2) in terms of mass percentage, the hexavalent chromium reducing agent NaHSO 3 Accounted for 85%, alkaline activator Ca(OH) 2 Accounted for 15%; 3) In terms of mass percentage, the soluble phosphate Ca(H 2 PO 4 ) 2 Accounted for 42%, alkaline auxiliary agent CaCO 3 It accounts for 8%, and the clay mineral a...

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Abstract

The invention belongs to the technical field of environment protection, and relates to a remediating technology for chromium-contaminated soil, in particular to a reduction-stabilization two-stage type remediating method for the chromium-contaminated soil. The method sequentially comprises the following steps that (1) after a chromium reducing agent and the chromium-contaminated soil are evenly mixed, the humidity of the soil is adjusted to 20%-40%, chromium in the soil and the chromium reducing agent fully react for 0.5-5 days, and the content of Cr (VI) in the soil is lowered to below 150 mg / kg, namely remediation of the reduction stage is completed; and (2) chromium stabilizing agents are added into the contaminated soil after reduction through the step (1), the chromium stabilizing agents and the soil are evenly mixed, the humidity of the soil is still kept at 20%-40%, and the soil is stabilized for 15-60 days, namely the stabilization stage of the chromium-contaminated soil is completed. By means of the method, the toxicity of the chromium can be lowered, and the total leaching concentration of the chromium in the soil is greatly lowered; the method can be used for ex-site remediation and in-site remediation, and is a rapid and efficient chromium-contaminated soil remediating method.

Description

Technical field [0001] The invention belongs to a chromium-contaminated soil remediation technology in the technical field of environmental protection, and specifically is a two-stage remediation method for chromium-contaminated soil reduction-stabilization. Background technique [0002] With the development of industry and society, the demand for chromium in human production and life is increasing year by year, and the world's chromium production is increasing. Wastewater, sludge, waste gas, etc. produced in leather processing, electroplating industry, paint and pigment production, printing and dyeing industry, pharmaceutical and organic synthesis industries all contain chromate or a large amount of chromium slag. By 2000, the total world production of hydrated sodium dichromate was approximately 740 thousand tons. Chromate and its compounds are highly corrosive and are highly toxic to animals, plants and microorganisms, and have lethal, carcinogenic and teratogenic effects. U...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 魏小娜李法云
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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