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A method for continuously remediating heavy metals in soil by using chelating agent

A technology for repairing soil and chelating agents, applied in the field of environmental pollution control, can solve problems such as inability to realize chelating agents, achieve considerable economic benefits, reduce biological dilution, and simple follow-up treatment

Inactive Publication Date: 2011-12-14
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although chelating agents have been applied to some soil remediation technologies, such as patents 0214882.7 and 200810220712.9, which disclose the preparation method of complexing agent microcapsules and their use in soil remediation, none of the existing technologies can realize how Make full use of chelating agents to realize the technical problems of continuous soil restoration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of coated chelating agent:

[0024] Inorganic compound silicate and organic compound modified starch were selected as coating materials to coat EDTA. First put 500 grams of EDTA into a heatable container, place it on an adjustable-speed shaker, 200-300 revolutions per minute, and heat at a temperature of 60-80°C. Then dissolve polyvinyl alcohol in water as a binder, spray polyvinyl alcohol on the surface of EDTA, and form particles with basically the same size and a diameter of 1-2 mm in 10 minutes. These granules were divided into 18 equal portions and filled into different containers. Divided into the following treatments: different coating materials (silicate and modified starch) and different coating times (5 minutes, 15 minutes and 30 minutes), each treatment set 3 replicates. The silicate and the modified starch are formulated into 1% solutions respectively, and are sprayed intermittently on the above-mentioned granules respectively. Maintain suffic...

Embodiment 2

[0028] Ramie is implanted in the soil to be treated; After the plant survives for 5 days, add the coated EDTA chelating agent that accounts for 0.25% of soil weight in the soil as described in Embodiment 1; Regularly harvest the aerial part of the plant continuously, and the underground part continues Growth cycle harvesting.

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Abstract

The invention discloses a method for continuously repairing heavy metals in soil by using a chelating agent, which is characterized in that it comprises the following steps: implanting ramie into the soil to be treated; after the plants survive, adding 0.05%-0.5 % of the coated EDTA chelating agent; the aerial part of the plant is regularly and continuously harvested, and the underground part continues to grow and harvest in cycles. The size of EDTA particles in the coating EDTA chelating agent is 0.5-2mm in diameter; the coating is an inorganic layer with a thickness of 0.25-0.35mm or an organic layer with a thickness of 0.30-0.40mm. The repairing method disclosed in the present invention, by selecting the coated EDTA chelating agent with a suitable coating thickness, makes its release efficiency organically match with the growth cycle of ramie, enhances the soil repairing ability, and further reduces the environmental risk of the chelating agent.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control, in particular to a method for improving the efficiency of plant extraction of heavy metals from soil by using a slow-acting chelating agent coating process. Background technique [0002] Heavy metals and their compounds are well-known "three substances", namely teratogenic, carcinogenic and mutagenic. At the same time, the pollution process of heavy metals in the soil system has the characteristics of concealment, long-term and irreversibility. The area of ​​cultivated land polluted by heavy metals in my country is nearly 6 million hectares, accounting for about 8% of the total cultivated land. On the other hand, soil heavy metal pollution leads to excessive heavy metal content in crops in farmland, which greatly restricts the production of pollution-free food, green food, organic food and the export of agricultural products, which is also serious for the increase of econ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 杨兵叶志鸿周密束文圣仇荣亮蓝崇钰
Owner SUN YAT SEN UNIV
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