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Method for repairing heavy metal cadmium contaminated soil by strengthening phytolacca americana through nitrogen fertilizer

A technology for cadmium-contaminated soil and heavy metals, which is applied in the field of phytoremediation, can solve the problems that the restoration efficiency needs to be further improved, the growth rate of cadmium hyperaccumulator plants is slow, and the biomass is small, and the operation is simple, the residence time is long, and the biomass is increased. Effect

Inactive Publication Date: 2019-10-25
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the existing hyperaccumulator phytoremediation technology, cadmium hyperaccumulator plants have problems such as slow growth, small biomass, and remediation efficiency that need to be further improved. The method is to apply nitrogen fertilizer to the cadmium-contaminated soil first, then plant pokeweed seedlings, and then remove all the grown pokeweed from the soil, and use nitrogen fertilizer to strengthen pokeweed and reduce cadmium in the soil content, and has the advantages of not causing secondary pollution, not destroying the physical and chemical properties of soil, etc.

Method used

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  • Method for repairing heavy metal cadmium contaminated soil by strengthening phytolacca americana through nitrogen fertilizer
  • Method for repairing heavy metal cadmium contaminated soil by strengthening phytolacca americana through nitrogen fertilizer
  • Method for repairing heavy metal cadmium contaminated soil by strengthening phytolacca americana through nitrogen fertilizer

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Experimental program
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Embodiment 1

[0042] Test location: The geographic location is 118°49′22″ east longitude 32°4′56″ north latitude, and the altitude is about 40 meters. The area has a humid subtropical climate, with an average annual temperature of 15.4°C, an average annual rainfall of 117 days, an average rainfall of 1106.5 mm, a relative humidity of 76%, and a frost-free period of 237 days.

[0043] Test soil: The test soil is cadmium polluted soil, the average content of cadmium is 0.81mg / kg, its basic physical and chemical properties are: pH value 5.76, organic matter 31.5g / kg, total nitrogen 0.145%, available phosphorus 73.9mg / kg, available potassium 62.4 mg / kg, cation exchange capacity 13.0cmol / kg.

[0044] Phytolacca americana L. seeds: Phytolacca americana L. seeds were purchased from the Agricultural Material Sales Department of Gaofengyuan, Longgang District, Shenzhen.

[0045] Main test instruments and reagents: artificial incubator (I-36VL, Percival), microwave digester (Mars 6, CEM), inductivel...

Embodiment 2

[0054] The test soil of the present embodiment, pokeweed seed are all identical with embodiment 1, and difference is:

[0055] A method of using nitrogen fertilizer to strengthen pokeweed in this embodiment to restore heavy metal cadmium-contaminated soil, the specific steps are:

[0056] To the acidic red soil with a total cadmium content of 0.81mg / kg, ammonium sulfate in solid form is applied once as a nitrogen fertilizer, and the application amount of the nitrogen fertilizer is calculated as N element, 15kg / mu. After 24 hours of nitrogen fertilizer application in the soil, transplant Pokeweed seedlings with relatively consistent seedling height (6-8cm) into the soil. The average temperature during cultivation is 25±6°C, and the soil moisture content is kept at the rate of field water capacity. 40% to 80%, and the culture time is 30 days.

[0057] After 30 days of cultivation, remove all Pokeweed from the soil and harvest the whole Pokeweed plant; wash the plants with ultra...

Embodiment 3

[0059] The basic content of the present embodiment is the same as that of Example 2, the difference being that the ammonium sulfate in solid form is applied once in the acidic red soil with a total cadmium content of 0.81 mg / kg as a nitrogen fertilizer, and the application amount of the nitrogen fertilizer is N element meter, 30kg / mu. The experiments in this example were repeated 4 times, and the results were averaged.

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Abstract

The invention discloses a method for repairing heavy metal cadmium contaminated soil by strengthening phytolacca americana through nitrogen fertilizer, and belongs to the field of plant restoration ofthe contaminated soil. The nitrogen fertilizer is applied to the cadmium contaminated soil firstly, then phytolacca americana seedlings are planted into the fertilized soil, then all the grown phytolacca americana is removed from the soil, and integral phytolacca americana plants are obtained and subjected to harmless treatment. By applying the nitrogen fertilizer to the cadmium contaminated soiland then planting the phytolacca americana seedlings into the fertilized soil, the content of cadmium in the cadmium contaminated soil can be effectively decreased, and the advantages of quickness, high efficiency, environmental friendliness and the like are achieved.

Description

technical field [0001] The invention belongs to the field of phytoremediation of polluted soil, and more specifically relates to a method for using nitrogen fertilizer to strengthen pokeweed to remediate soil polluted by heavy metal cadmium. Background technique [0002] The heavy metal cadmium is the first class of carcinogen identified by the International Agency for Research on Cancer (IARC). After entering the farmland soil, it not only poisons the crop itself, but also enters the food chain through the enrichment of crops, causing serious damage to human health. Studies have shown that the biological half-life of cadmium in the human body is as long as 10 to 30 years. Excessive intake of cadmium by the human body can cause diseases such as prostate cancer, gastric cancer, and itai disease. Therefore, the remediation of cadmium-contaminated soil is one of the key contents of the national environmental pollution control work. [0003] my country's cadmium-polluted cultiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/105B09C2101/00
Inventor 王琪张振华王长永
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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