Method for improving chelating agent leaching soil

Abstract

The invention discloses a chelating agent washed-off soil improvement method which includes the steps: planting aquatic plants into chelating agent washed-off soil; applying fertilizers for cultivation to improve chelating agent washed-off soil. The aquatic plants are alligator alternanthera herbs and / or myriophyllum spicatum. The alligator alternanthera herbs and / or myriophyllum spicatum are used for improving the chelating agent washed-off soil for the first time, degradation activity of enzyme and microorganisms in the restorable soil can be improved, chelating agents remaining in the soil can be biologically degraded, toxicity of the soil is remarkably reduced, the problem of difficulty in growth and survival of plants in the chelating agent washed-off soil is solved, and the method has the advantages of low cost, high practicability, good improvement effect and the like.

Description

technical field [0001] The invention belongs to the field of soil chemical restoration and relates to a method for improving chelating agent leaching soil. Background technique [0002] Nowadays, the use of artificial chelating agents for leaching and remediation of heavy metal-contaminated soil is an efficient and feasible method for remediating contaminated soil, but the problems in this remediation method cannot be ignored. According to relevant reports, the use of chelating agents will have a serious impact on soil fertility and plant growth, such as: (1) Adding EDTA to the soil will strengthen the mobility of Cd in the soil and increase the toxicity of Cd to plants, thereby inhibiting The growth of Indian mustard; (2) with EDTA-Na 2 When used as a leaching agent to wash the soil, it will cause the loss of nutrients in the soil. Compared with leaching agents such as citric acid and malic acid, EDTA-Na 2 The resulting loss of nutrients in the soil is the largest, and it...

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Problems solved by technology

It can be seen from the above related reports that the chelating agent will cause the loss of nutrients in the soil during the washing process, resulting in a decrease in soil fertility, making the plants unable to grow normally, which is not conducive to the subsequent resource utilization of the soil; at the same time, due to the biodegradability of the chelating agent Poor, can remain in the soil for a long time, has potential risks, and the residual chelating agent is toxic to plants, will inhibit the normal growth of plants, and even cause the plants to die directly, and the subsequent resource utilization of soil cannot be realized

[0003] Although breakthroughs have been made in the use of chelating agents to treat heavy metals in soil, there have been no reports on how to reduce the toxicity of chelating agent leaching soil and how to improve the fertility and physical and chemical properties of chelating agent leaching soil.

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