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Repair method for chromium-polluted soil

A technology of chromium-contaminated soil and a remediation method is applied in the field of remediation of chromium-contaminated soil by using tangerine peel as a soil remediation agent, which can solve the problems of physical and chemical properties and negative effects of secondary polluted soil, and achieves low price, easy access, A wide range of effects

Active Publication Date: 2015-09-30
BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problem that repairing chromium-contaminated soil with remediation agents such as ferrous salts and sulfides is likely to cause secondary pollution and negatively affect the physical and chemical properties of the soil, and propose an environmentally friendly and suitable for different pollution degrees and Ways of Remediation of Chromium Contaminated Soil

Method used

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  • Repair method for chromium-polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The present embodiment provides a kind of remediation method of chromium-contaminated soil, specifically comprises the following steps:

[0040] (1) Grind the dried tangerine peel to 10-100 mesh, and take 5% tangerine peel of the dry weight of the soil (in this embodiment, the dry weight of the chromium repaired soil is 20 kg, and the amount of tangerine peel is 1 kg).

[0041] (2) water and the tangerine peel that step 1 obtains is evenly sprinkled in 20kg chromium-contaminated soil, and the moisture content of soil after controlling sprinkling is 40%;

[0042] (3) Place the chromium-contaminated soil mixture obtained in step 2 at 25° C. for repairing and culturing for 28 days.

[0043] Present embodiment provides the X-ray absorption spectrogram of the soil before and after remediation simultaneously, see figure 1 . Since Cr(Ⅵ) has an obvious front peak in the border area but trivalent chromium does not, it can be seen from this figure that there is more hexavalent ...

Embodiment 2

[0045] Compared with Example 1, the only difference is: in the present example, the consumption of tangerine peel is 0.5kg.

Embodiment 3

[0047] Compared with Example 1, the only difference is: in the present example, the consumption of tangerine peel is 3kg.

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Abstract

The invention relates to the field of polluted soil regeneration, in particular to a repair method for chromium-polluted soil. The method comprises the following steps: (1) pericarpium citri reticulatae is crushed for future use; (2) the crushed pericarpium citri reticulatae and the chromium-polluted soil are uniformly mixed to control the water content within 20-60% to obtain a chromium-polluted soil mixture; and (3) the chromium-polluted soil mixture is put at a temperature of 20-45 DEG C for repairing and culturing. The repair method for chromium-polluted soil, provided by the invention, has the following advantages: the removing rate of hexavalent chromium is the highest to reach 99.99%; the repair method is suitable for different chromium-polluted soils; compared with a curing stabilization method adopted in the prior art, the repair method is higher in chromium removing rate, is shorter in repair period, is free of secondary pollution, and can improve the soil quality; and the method is simple in operation, is strong in adaptability, is wide in repair medicament source, is easy in obtaining, and is low in cost.

Description

technical field [0001] The invention relates to the field of regeneration of polluted soil, in particular to a method for repairing chromium-polluted soil by using tangerine peel as a soil repair agent. Background technique [0002] Chromium is an important element in industrial production. Hexavalent chromium has strong toxicity, biological activity and mobility, and is very harmful to human health. The development of chromium-related industries has led to serious chromium pollution in the soil, which directly threatens the safety of the ecological environment and public health. The treatment and restoration of chromium-contaminated soil is imminent. [0003] The existing remediation technologies for chromium-contaminated soil mainly include physical remediation technology, biological remediation technology and chemical remediation technology. Physical remediation technology is the application of physical methods to remove the heavy metal chromium in the soil, mainly inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 刘增俊夏旭朱优清姚珏君夏天翔姜林张文毓钟茂生王世杰
Owner BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION