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A method for phytoremediation of chromium-contaminated soil

A chromium-contaminated soil and phytoremediation technology, applied in the restoration of contaminated soil, etc., can solve the problems of high cost and complicated technology, and achieve the effect of low cultivation cost, fast growth, and well-developed rhizomes

Active Publication Date: 2021-06-29
BEIJING RES CENT OF INTELLIGENT EQUIP FOR AGRI
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Problems solved by technology

[0003] At present, the methods for remediating heavy metal chromium-contaminated soil include: reduction precipitation method, using iron, ferrous salt, sulfide and other reducing agents to reduce hexavalent chromium to trivalent chromium, thereby precipitating; chemical cleaning method, using chelating agents such as EDTA to clean the soil , by chelating chromium in the soil to achieve the purpose of remediation; phytoremediation, using chromium-resistant plants to absorb or enrich chromium in the soil, and harvesting plants to achieve the purpose of soil chromium removal. The first two methods are costly and technically complicated. And facing the problem of secondary pollution, the phytoremediation method is simple, wide in scope of application, low in cost, and more direct in effect. However, there are few plants that can effectively enrich the heavy metal chromium

Method used

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  • A method for phytoremediation of chromium-contaminated soil
  • A method for phytoremediation of chromium-contaminated soil

Examples

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Embodiment 1

[0027] The present embodiment provides a kind of method for phytoremediation of chromium-contaminated soil, comprising the steps of:

[0028] 1) Seedling cultivation of Moss inunica

[0029] Cuncao moss was planted in early April, the amount of seed per mu was 0.5kg, the soil was disinfected and sterilized with 50% carbendazim 800 times solution before sowing, 30 kg of calcium magnesium phosphorus base fertilizer was applied per mu, and the soil surface was covered with 1cm thick soil after sowing , control the soil moisture, promote seed germination, and transplant the moss to heavy metal chromium-contaminated soil when the moss grows to 5cm.

[0030] 2) Chromium-contaminated soil preparation:

[0031] The basic soil was taken from Suihua City, Heilongjiang Province, soil without heavy metal chromium pollution, dried the soil at 105°C for 8 hours, took 10kg and put it into a square plastic cultivation pot with a size of 40cm*40cm, and then sprayed K 2 Cr 2 o 7 solution, a...

Embodiment 2～3

[0034] The steps in Examples 2 and 3 are the same as in Example 1, except that the concentration of chromium-contaminated soil in Step 2 is 200 mg / kg and 300 mg / kg respectively.

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Abstract

The invention provides a method for phytoremediation of chromium polluted soil. The method comprises the following steps: transplanting the moss to chromium-polluted soil. Wherein, the concentration of chromium (potassium dichromate) in the soil is lower than 300 mg / kg. The present invention uses C. chinensis to restore chromium-contaminated soil. C. syringa has well-developed rhizomes, strong tillering power, fast growth, drought resistance, poor soil resistance, and it is resistant to repeated harvesting. It only needs to be planted once to pass through the underground continuously. It grows rhizomes and reproduces many new plants; moss is resistant to chromium-contaminated soil, and can transfer chromium in the soil to the aboveground part through root absorption, and can remove heavy metal chromium from the soil by harvesting the aboveground part.

Description

technical field [0001] The technical field of soil remediation of the present invention, more specifically, relates to a method for phytoremediation of chromium-contaminated soil. Background technique [0002] Chromium in nature exists in the form of trivalent chromium and hexavalent chromium. Under oxidative conditions, trivalent chromium can be converted into hexavalent chromium, and hexavalent chromium is the most toxic, the most durable, and easily absorbed by plants. Processing, chemical light industry, metal smelting, mechanical processing, plastic processing and other fields are widely used. Due to the unreasonable use and discharge of it, as well as the unreasonable use of pesticides and fertilizers, my country's soil is facing a large area of ​​chromium pollution, and the chromium element It can enter the human body through the food chain and endanger human health. Therefore, it is particularly important to effectively repair chromium-contaminated soil and avoid furth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 侯佩臣陈立平王成李爱学王晓冬何璐璐
Owner BEIJING RES CENT OF INTELLIGENT EQUIP FOR AGRI
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