Method for remediating cadmium-contaminated soil with compositae plants

Abstract

The invention discloses a method for remediating cadmium-contaminated soil with compositae plants, wherein the method comprises the following steps: A, cultivation: sowing and cultivating compositae plants under general soil conditions from late March to early April; B, planting: when compositae plant seedlings are as high as 10-13 cm, selecting cadmium-contaminated soil, preparing the soil, fixedly planting the compositae plant seedlings, and keeping the plant spacing between 30 and 35 cm; C, management: generally without watering and fertilization, spraying a urea solution mixed with potassium dihydrogen phosphate onto leaf surfaces for 1-3 times in the budding period, the flowering period and other growth peak seasons; D, harvesting: harvesting in the flowering period in August to September, wherein the plants after harvesting include ground parts and underground parts; E, repetition: repeating the step B and the step C, and harvesting again in February to March next year; and F, subsequent treatment: repeating the steps until the content of heavy metal cadmium in the selected soil meets environmental safety standards. The compositae plants have short growth cycle, strong adaptability and good ornamental value, and the method can be implemented in most areas.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a method for remediating cadmium-contaminated soil by using compositae plants. Background technique [0002] The waste water, waste residue, and tailings formed during the mining and smelting of non-ferrous metal mineral resources not only occupy and affect the land in the mining area, but also cause ecological damage and soil pollution in the surrounding towns of the mining area due to the heavy metal elements transferred through the discharge of industrial waste. In the process of industrial production and the discharge and retention of industrial waste, taking industrial wastewater discharge as an example, the heavy metal elements in the wastewater transfer and accumulate to the coastal soil, which has greatly changed the soil environment. Changes in the proportion of elements in the soil, soil physical properties and chemical properties lead to a decline in soil quality, and t...

AI Technical Summary

Problems solved by technology

However, the screening of plant materials is the most critical and difficult part of phytoremediation technology. On the one hand, due to factors such as climate, humidity, and soil properties in heavy metal-polluted areas, the adaptability and survival of plant species in specific areas are limited, making it difficult to find Widely applicable plants; second, the management of plant growth regulation during the planting of some plants to restore the soil environment requires a lot of manpower, material and financial resources, the economic effect is not significant and the restoration effect is unstable; third, edible economical crops such as those used for plants Restoration technology, after heavy metals are absorbed by plants, if they enter the edible parts of plants, they will bring hidden risks to human health