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A harmless and resourceful restoration method for chromium-contaminated soil

A technology of chromium-contaminated soil and remediation method is applied in the field of resource restoration and harmless chromium-contaminated soil, which can solve the problems of secondary pollution of hexavalent chromium and Cr, and achieves the improvement of the strength and hardness of the swivel, the increase of particle fineness, The effect of improving repair efficiency

Active Publication Date: 2020-07-31
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the toxicity of heavy metal chromium is mainly represented by hexavalent chromium Cr(VI), the toxicity of hexavalent chromium Cr(VI) is about 100 times that of trivalent chromium Cr(III), and the chromium in soil polluted by hexavalent chromium Cr(VI) Most of them exist in water-soluble and weakly acid-extractable forms, and trivalent chromium Cr(III) can be transformed into hexavalent chromium Cr(VI) under aerobic conditions, so there are still hexavalent chromium Cr( Ⅵ) and other secondary pollution risks

Method used

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  • A harmless and resourceful restoration method for chromium-contaminated soil
  • A harmless and resourceful restoration method for chromium-contaminated soil
  • A harmless and resourceful restoration method for chromium-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 Sintered brick technology remediation of chromium-contaminated soil in chemical industry

[0047] The polluted soil used in this example is collected from a chemical plant that has been polluted by heavy metal chromium for a long time, and the average total chromium concentration is 27000mg kg -1 , in which the average concentration of hexavalent chromium (Cr(VI)) reaches 5000mg·kg -1 . It can be seen through small test experiments that after the screening, reduction and material preparation described below, the hexavalent chromium (Cr(VI)) content of the mixed material is 120mg / Kg (using "solid waste-leaching toxicity leaching method acetate buffer solution "(HJ / T 300-2007) method), the content does not meet the sintering requirements, so after adjustment, a series of process methods of sieving, cleaning, reducing, material allocation and brick high-temperature sintering of fine-grained components of chromium-contaminated soil are used in sequence. Complete...

Embodiment 2

[0092] Example 2 Technical restoration of sintered bricks for a certain chromium-contaminated industrial site soil

[0093] The polluted soil used in this example is taken from a site polluted by heavy metal chromium for a long time, and the average total chromium concentration is 22500mg kg -1 , in which the average concentration of hexavalent chromium (Cr(VI)) reaches 4200mg·kg -1 . Through the small test experiment, it can be seen that after the screening, reduction and material preparation described below, the hexavalent chromium (Cr(VI)) content of the mixed material is 65mg / Kg (using "solid waste-leaching toxicity leaching method acetate buffer solution "(HJ / T 300-2007) method), the content does not meet the sintering requirements, so after adjustment, a series of process methods of sieving, cleaning, reducing, material allocation and brick high-temperature sintering of fine-grained components of chromium-contaminated soil are used in sequence. Complete the remediation...

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Abstract

The invention relates to a heavy-metal-contaminated soil remediation technology, in particular to a harmless and recycling remediation method for chromium-contaminated soil. The to-be-treated chromium-contaminated soil is subjected to particle-grade component screening through a two-stage screening method and cleaned, and fine sand particle components of 0.05-0.2 mm and powder particle / clay particle components of smaller than 0.05 mm are obtained; the soil components of 0.05-0.2 mm and smaller than 0.05 mm are treated through soil pH adjusting, pH stability strengthening and hexavalent chromium (Cr(VI)) reduction; then according to the mixed material parameter optimization requirements (the plastic index, the calorific value, the silicon aluminum mass ratio and the particle grade), the contaminated soil of the fine sand particle components, the contaminated soil of the powder particle / clay particle components, coal gangue and fly ash with the established weight ratio are matched and mixed, and the mixed material is fully stirred and homogenized; and the mixed material is subjected to green brick pressing after water content adjusting and sintered into a brick in the mode that hightemperature sintering is combined with brick body internal combustion, and thus harmless and recycling remediation for the contaminated soil sintered brick is achieved. The harmless and recycling remediation method has the characteristics of heavy-metal-chromium-contaminated soil remediation and recycling utilization, and has large economic advantages and industrialization prospects compared withother heavy-metal-contaminated soil remediation technologies.

Description

technical field [0001] The invention relates to a heavy metal-contaminated soil restoration technology, in particular to a harmless and resource-based restoration method for chromium-contaminated soil. Background technique [0002] Heavy metal contaminated soil remediation technology has been extensively researched and developed in recent years. Soil remediation technologies at this stage mainly include guest-soil method and leaching method in physical methods, fixed precipitation method, complexation stabilization method, and solid-phase adsorption in chemical methods. Phytoremediation, microbial remediation, and agricultural agronomic ecological restoration in biological methods. Although there are many types of methods, each technology has corresponding defects and deficiencies, such as destroying soil structure, reducing soil fertility, secondary pollution risks, and high remediation costs, making it difficult to realize large-scale contaminated soil remediation engineer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/00C02F1/62C02F101/22
CPCB09C1/00B09C1/08C02F1/62C02F2101/22
Inventor 郭书海王卅袁立竹姚存志李刚潘腾董畅李淑彩
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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