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Phytoremediation method for chromium polluted soil

A chromium-contaminated soil and phytoremediation technology, applied in the field of environmental protection, can solve problems such as yellowing, difficulty in suppressing yellowing, and short validity period of reducing agents, and achieve obvious environmental benefits

Inactive Publication Date: 2017-02-15
李尧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the adsorption characteristics of the soil to hexavalent chromium and the short effectiveness of reducing agents, many hexavalent chromium-contaminated soils have the phenomenon of "returning yellow" after solidification / stabilization and repair, that is, the content of hexavalent chromium in the leaching solution of the repaired soil After a certain period of time, it increases, resulting in the appearance of (hexavalent chromium color (yellow)) on the surface of the cured body
Even if an excessive amount of reducing agent is added, it is difficult to suppress the occurrence of the phenomenon of "returning yellow". The reason is that the release time of hexavalent chromium in the soil is long and the effective period of reducing agent is short.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step 1, first use an excavator to dig out the surface deep soil, and then apply organic fertilizer to the deep soil layer; then use a rotary tiller to plow and stir the soil to make the organic fertilizer evenly distributed, and then continue to add organic fertilizer to the soil and plowing;

[0018] Compost the plowed soil, and design the composting body, so that the reference level of the composting operation is 60cm underground; add water to the soil to the maximum field water holding capacity, so that the soil is in an anaerobic environment; Lay plastic film on the surface of the body to maintain the anaerobic environment in the soil for 2 months.

[0019] Step 2. After the anaerobic composting is completed, remove the surface plastic film, plow and compost, add organic fertilizer before plowing, and the sequence of plowing is opposite to the previous one; the frequency of plowing and composting is once every 6 days. Composting for 1 month completes aerobic compos...

Embodiment 2

[0024] Step 1, first use an excavator to dig out the surface deep soil, and then apply organic fertilizer to the deep soil layer; then use a rotary tiller to plow and stir the soil to make the organic fertilizer evenly distributed, and then continue to add organic fertilizer to the soil and plowing;

[0025] Compost the plowed soil, and design the composting body, so that the reference level of the composting operation is 60cm underground; add water to the soil to the maximum field water holding capacity, so that the soil is in an anaerobic environment; Lay plastic film on the surface of the body to maintain the anaerobic environment in the soil for 2 months.

[0026] Step 2. After the anaerobic composting is completed, remove the surface plastic film, plow and compost, add organic fertilizer before plowing, and the sequence of plowing is opposite to the previous one; the frequency of plowing and composting is once every 6 days. Composting for 1 month completes aerobic compos...

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Abstract

The invention discloses a phytoremediation method for chromium polluted soil. Plants are planted on a polluted land twice: other plants are planted at the second time after 2 to 6 months when certain plants are planted at the first time. The plants comprise leaf mustards, ramies, alfalfas, summer squashes and corns. Trees are planted on the chromium polluted soil; and hexavalent chromium in the soil is migrated into crops, such as lawns and the corns, with thick roots under the photosynthesis action and the action that the roots absorb water, so that the aim of remediating the chromium polluted soil is fulfilled. The phytoremediation method is a technology which is safe, secondary pollution-free and obvious in economic benefit, social benefit and environmental benefit.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a phytoremediation method for chromium-contaminated soil. Background technique [0002] Chromium salt is one of the main series of inorganic chemical products in my country. It is widely used in industries such as metallurgy, tanning, pigments, dyes, spices, metal surface treatment, wood preservation, and military industry. It is listed as the eight most competitive resources. One of the raw material products. my country is the main producer of chromium salts, with an annual output of about 400,000 tons and an annual increase of 10%, accounting for about 40% of the world's output. In my country, chromium salts are mainly produced by roasting with calcium. Usually, 2.5 to 3 tons of chromium slag will be discharged for every ton of chromium salt produced. The accumulation of a large amount of chromium slag will lead to chromium pollution on the site. W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 李尧
Owner 李尧
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