Method for phytomicrobially remediating heavy metal contaminated soil

By planting alfalfa in heavy metal-contaminated soil and inoculating it with lead-, zinc-, and copper-tolerant bacteria L1, a plant-microbe symbiotic system was established, which solved the problem of low nitrogen removal efficiency in biological ponds under low-temperature conditions and achieved efficient remediation of heavy metal-contaminated soil.

CN116511234BActive Publication Date: 2026-05-29XIAN UNVERSITY OF ARTS & SCI
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Patent Information

Application Number
CN202211004684.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-22
Publication Date
2026-05-29
Estimated Expiration
2042-08-22

AI Technical Summary

Technical Problem

Existing technologies suffer from low nitrogen removal efficiency in biological ponds under low-temperature conditions, especially in the remediation of heavy metal contaminated soils, where microbial remediation is ineffective.

Method used

A combined remediation method using alfalfa planting and lead-, zinc-, and copper-tolerant bacteria L1 was adopted. By planting alfalfa in heavy metal-contaminated soil and inoculating it with lead-, zinc-, and copper-tolerant bacteria L1, a symbiotic system was established to promote plant growth and degrade heavy metals.

Benefits of technology

It significantly reduces the content of heavy metals such as lead, zinc, and copper in the soil, lowers the cost of plant raw materials, is simple to operate, does not produce secondary pollution, and improves the remediation efficiency of heavy metal contaminated soil.

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Abstract

The application discloses a method for repairing heavy metal contaminated soil by combining plants and microorganisms, and comprises the following steps: planting alfalfa seeds in heavy metal contaminated soil; inoculating lead and zinc copper resistant bacteria L1 into the heavy metal contaminated soil after 30 days when the seeds germinate; and harvesting the alfalfa after the growth period of the alfalfa ends. The application has a very obvious effect on adsorbing lead, zinc and copper heavy metals in the soil. The plant raw material is low in cost, the preparation process is simple and easy to operate, and the bacterial liquid is easy to culture. The application has small investment for removing heavy metals and no secondary pollution.
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