Method for remediating cadmium pollution of soil with red-spotted stonecrop

Abstract

The invention relates to the technical field of soil remediation, and particularly relates to a method for remediating cadmium pollution of soil with red-spotted stonecrop. The method comprises the following steps: step A: applying a biomass charcoal improver to the polluted soil; step B: planting red-spotted stonecrop in the polluted soil; step C: after growing for 60-150 days, cutting overground plant parts of the red-spotted stonecrop and then applying a nutrient solution; and step D: after repeating the step C for 1-4 times, removing the whole red-spotted stonecrop. The method provided by the invention uses the red-spotted stonecrop and the biomass charcoal improver for joint remediation; the biomass charcoal improver provides a relatively good growth environment for the red-spotted stonecrop, plays a role of promoting growth of roots of the red-spotted stonecrop, and enhances vitality of the red-spotted stonecrop; the red-spotted stonecrop can enrich the heavy metal cadmium efficiently; the content of cadmium in the polluted soil can be reduced greatly under double action of the red-spotted stonecrop and the biomass charcoal improver; the method can achieve the purpose of complete remediation after three to six years and has good social and economic benefits and popularization and application values.

Description

Technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for repairing soil cadmium pollution by using sedum. Background technique [0002] Soil is an important part of the self-heating ecosystem for human existence. With the rapid development of agriculture, industry and commerce, heavy metal pollution has seriously threatened the safety of the soil environment. The hazards of heavy metals: 1. The higher the content of heavy metals in the soil, the lower the microbial biomass and enzyme activity, which will affect soil quality. 2. The heavy metal elements in the soil that have different effects on plants will not affect the normal growth of plants at a certain concentration, but when the concentration exceeds a certain limit, they will have a toxic effect on plants, affect the yield and quality of plants, and even Lead to the mutation or extinction of plants. 3. The human nervous system and bone marrow hematopoietic sy...

AI Technical Summary

Problems solved by technology

Hazards of heavy metals: 1. The higher the content of heavy metals in the soil, the lower the microbial biomass and enzyme activity, which will affect the soil quality

2. The heavy metal elements in the soil that have different effects on plants will not affect the normal growth of plants at a certain concentration, but when the concentration exceeds a certain limit, they will have toxic effects on plants, affect the yield and quality of plants, and even cause plant mutation or extinction

The application number is 201310538655.X, and the invention patent titled "Using lawn grass to ecologically restore cadmium-contaminated soil" uses lawn grass bermudagrass to extract heavy metals from cadmium-contaminated soil; The invention patent of "method of soil ecological restoration in mining area" uses animal manure to improve soil, and then sows several herbal plants for vegetation restoration; the application number is 201410018435.9, and the invention patent named "a method of ecological restoration of heavy metal polluted soil" adopts fast-growing The tree species sedum extracts several heavy metals from heavy metal-polluted soil, but the above-mentioned technologies are not effective in remediating soil cadmium pollution, and there is still a problem of high repair cost