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Method for repairing heavy metal polluted soil by using radix achyranthis bidentatae as manganese hyperaccumulator

A technology for super-accumulating plants and polluted soil, which is applied in the field of repairing heavy metal-contaminated soil with manganese hyper-accumulating plant Achyranthes bidentata, which can solve problems such as high technical requirements, soil structure damage, and high economic costs, and achieve strong fecundity and low investment. Low cost, no secondary pollution effect

Inactive Publication Date: 2012-08-15
SOUTHWEST UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conventional methods of remediation of contaminated soil, such as soil replacement method, leaching method, heat treatment, solidification, etc., have many problems in large-scale promotion due to their high technical requirements, high economic costs, or serious damage to soil structure.

Method used

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  • Method for repairing heavy metal polluted soil by using radix achyranthis bidentatae as manganese hyperaccumulator
  • Method for repairing heavy metal polluted soil by using radix achyranthis bidentatae as manganese hyperaccumulator
  • Method for repairing heavy metal polluted soil by using radix achyranthis bidentatae as manganese hyperaccumulator

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Embodiment Construction

[0018] The experimental soil type is purple soil, and each pot contains 2 kg of soil, according to the nutrient requirements of potted crops (N 200 mg·kg -1 , P 2 o 5 100 mg·kg -1 , K 2 O 150—200 mg·kg -1 ) respectively add urea, potassium dihydrogen phosphate and potassium sulfate 400, 200, 300 mg·kg -1 . A total of 8 treatments were set up in the experiment, namely: CK (control, no manganese added), 3000, 4000, 5000, 6000, 7000, 8000, 9000 and 10000 mg / kg, with MnCl 2 .4H 2 O was added in the form of 3 replicates for each treatment. After equilibrating for 1 week, soak the seeds in warm water at 30°C for 8-12 hours, remove them and put them in a container, cover them with a damp cloth to keep them moist, and when 50% of the seeds germinate, take them out and mix them with an appropriate amount of fine soil, and spread them on the surface of the manganese-contaminated soil. After the seedlings have emerged, thin the seedlings, leaving 1 plant in each pot. According t...

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Abstract

The invention relates to a technology for repairing heavy metal polluted soil, and in particular relates to a method for repairing heavy metal polluted soil by using radix achyranthis bidentatae as a manganese hyperaccumulator. The radix achyranthis bidentatae belongs to a renascent herb, and found by field investigation, the radix achyranthis bidentatae has strong tolerance and enrichment capacity on manganese. Indoor culture experiments prove that the radix achyranthis bidentatae is planted in manganese polluted soil, absorbs manganese from the soil by roots, and transports the manganese to an overground part for accumulation; and when growing to maturity, the radix achyranthis bidentatae is harvested and duly handled, thus the purpose of removing excessive manganese from the soil is achieved. Through a mode of continuously planting the radix achyranthis bidentatae on the manganese polluted soil and continually harvesting the radix achyranthis bidentatae, the manganese in the polluted soil is continuously extracted until the content of the manganese in the soil reaches the standard of environmental safety. The method is used for repairing the manganese polluted soil, and is a green and safe polluted soil treatment method.

Description

technical field [0001] The invention relates to the technical field of phytoremediation of heavy metal-contaminated soil, in particular to a method for remediating heavy metal-contaminated soil by using a manganese hyperaccumulator plant Achyranthes bidentata. Background technique [0002] Chongqing is rich in manganese ore resources, but the environmental pollution caused by manganese ore mining and processing is also very serious. Among them, Xiushan County of Chongqing City, Huayuan County of Hunan Province, and Songtao County of Guizhou Province are called the "Golden Triangle" of China's manganese ore due to their rich manganese ore resources. All". Xiushan County started to develop the manganese industry in 2001, and the contribution rate of the manganese industry to the local finance reached 70%. But at the same time of rapid economic development, the local ecological environment has also suffered serious pollution and damage. During the mining and processing of ma...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 郝庆菊江长胜黄小娟
Owner SOUTHWEST UNIVERSITY
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