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Method for remedying heavy metal contaminated soil under combined action of activating agent and plants

A technology of contaminated soil and phytoremediation, which is applied in the field of activator combined with phytoremediation of heavy metal-contaminated soil, which can solve the problems of soil physical and chemical properties and biological structure damage, abnormal plant growth, soil nutrient loss, etc., to ensure the safety and effective restoration of agricultural products , Improve the effect of the application range

Inactive Publication Date: 2019-05-14
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although traditional chelating agents and inorganic acids can effectively reduce the content of heavy metals in soil when used as activators, they may also cause damage to the physical and chemical properties and biological structure of the soil, resulting in the loss of soil nutrients and the abnormal growth of plants.

Method used

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  • Method for remedying heavy metal contaminated soil under combined action of activating agent and plants
  • Method for remedying heavy metal contaminated soil under combined action of activating agent and plants
  • Method for remedying heavy metal contaminated soil under combined action of activating agent and plants

Examples

Experimental program
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Effect test

Embodiment 1

[0016] The soil used for the test comes from the pastoral soil outside the west gate of the Jiulonghu Campus of Southeast University. The pH of the soil in this area is 6.89, which is a weakly acidic soil, and the organic matter content is low at 10.49g kg -1 , passed through a 2mm sieve after air-drying, and added CdCl exogenously 2 and lead acetate to make the content of cadmium and lead in the soil meet the requirements in Table 1, respectively, so as to simulate the combined pollution of lead and cadmium in different degrees of soil. After the soil samples of each treatment group were fully mixed, the soil water content was adjusted to 60% of the field water holding capacity, and after a period of aging, it was used as a simulated cadmium and lead polluted soil. The pot experiment was carried out in the greenhouse. Adopt upper and lower caliber (inner diameter) respectively to be 21cm, 13cm and the plastic pot that height is 12cm as culture pot, each pot is filled with ai...

Embodiment 2

[0024] The test site of this embodiment is located in Yixing City, Jiangsu Province. The soil pH in this area is 6.56, which belongs to weakly acidic soil; Environmental Quality Standard (GB 15618-1995) is 15 times the secondary standard (0.3mg kg-1), which is a soil heavily polluted by cadmium; the cadmium content of rice is 0.79mg kg-1, exceeding the National Food Safety Standard ( GB 2762-2012) four times the cadmium limit index (0.2mg kg-1) in food. In this area, plot 1 is planted in rotation with sedum and ryegrass, plot 2 is planted in rotation with southeast sedum and ryegrass, and plot 3 is planted with ryegrass alone. The sowing rate of ryegrass is 7kg / mu, and the sowing rate of Sedum sedum is 10000 plants / mu, and the activator citric acid aqueous solution is added one month before the plant receives goods. The harvested plants include aerial parts and underground parts, soil is collected, and the harvested plants and soil are digested by conventional methods to extr...

Embodiment 3

[0029] The test site of this embodiment is located in a town in Yixing City, Jiangsu Province. The pH of the soil in this area is 6.56, which belongs to weakly acidic soil; the organic matter content is low at 2.58%; the total cadmium content in the soil is 4.5 mg·kg -1 , the concentration of cadmium in the soil exceeds the secondary standard (0.3mg kg -1 ) is 15 times that of cadmium heavily polluted soil; the cadmium content of rice is 0.79mg·kg -1 , exceeding the "National Food Safety Standard" (GB 2762-2012) cadmium limit in food (0.2mg kg -1 ) 4 times. One of the 15 acres of land in this area is planted with rapeseed and giant fungus grass in rotation. The sowing rate of rapeseed is 0.5kg / mu, and the sowing rate of giant fungus is 3000 knots / mu. Add the activator one month before the plants are harvested. The harvested plants include aerial parts and underground parts, soil is collected, and the harvested plants and soil are digested by conventional methods to extrac...

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Abstract

The invention discloses a method for remedying heavy metal contaminated soil under the combined action of an activating agent and plants. The method comprises the following steps: (1), planting: planting heavy metal-enriching plants on contaminated soil; (2), activating: spraying an aqueous citric acid solution on the contaminated soil; (3), harvesting: harvesting the aboveground parts and the underground parts of the plants respectively; (4), performing subsequent treatment: discomposing the harvested aboveground parts and the harvested underground parts, extracting heavy metals, and repeating the activating step and / or the harvesting step. The method has the advantages of a good remedying effect, capability of achieving in-situ remediation, a short remedying cycle and the like, and is ofa great significance in widening the application range of a phytoremediation technology in the field of contaminated soil remediation.

Description

technical field [0001] The invention relates to the prevention and control technology of heavy metal polluted soil, in particular to a method for remediating heavy metal polluted soil with an activator combined with plants. Background technique [0002] At present, the soil is seriously polluted by heavy metals, and the heavy metal Cd in the soil will also affect human health through the food chain. Therefore, soil heavy metal pollution urgently needs to be treated, especially the remediation of cadmium-contaminated soil is particularly urgent. [0003] Phytoremediation usually refers to planting plants that can enrich the pollutants on heavy metal-contaminated soil. After the plants absorb heavy metals from the soil through their own growth and metabolism activities, the plants are harvested and subsequently processed (such as ash recovery, etc.), so that A method to achieve a certain repair effect. Phytoremediation usually includes: phytoextraction, phytovolatilization a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
Inventor 张亚平陈思慧许伟伟郝社锋沈凯
Owner SOUTHEAST UNIV
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