Repairing method of heavy metal contaminated soil

Abstract

The invention discloses a repairing method of heavy metal contaminated soil. The repairing method includes the steps of (1), breaking heavy metal contaminated soil to obtain fine soil; (2), spreadingmixed repairing additives to the fine soil, spraying phosphoric acid solution to the fine soil to keep soil moisture at 45%, covering the fine soil with thin film, and repairing for 25 days; (3), adding excrement to repaired soil, adding in earthworms, inoculating magnetotactic bacteria to the fine soil, and culturing for 30 days; (4), keeping the soil submerged, placing magnets on the surface ofsoil, removing earthworms crawling out the soil, and cleaning the surface soil after 12 days; (5), planting grass in the soil. The repairing method can effectively solve the problems that fixing efficiency is low, heavy metal is easy to release again, repairing cycle is long, and repairing cost is high of the conventional repairing method.

Description

technical field

[0001] The invention relates to the technical field of soil remediation, in particular to a method for remediating heavy metal polluted soil. Background technique

[0002] With the sustained and rapid development of industry and agriculture in our country, soil heavy metal pollution is becoming more and more serious, threatening food production and human health, and has become one of the most attention-grabbing environmental problems. The high concentration of heavy metals in polluted soil will harm the growth and development of plants, resulting in reduced food production and quality; it will also change the biological population in the soil, affect the structure and function of its ecosystem, and lead to the degradation of soil productivity.

[0003] Soil remediation is a technical measure to restore the normal function of polluted soil. In the soil remediation industry, there are more than one hundred existing soil remediation technologies, and there are ...