Method for repairing calcareous cadmium-polluted soil

Abstract

The invention discloses a method for repairing calcareous cadmium-polluted soil, which adopts a plant extraction repairing method, the used repairing plant is solanum nigrum, and the used activating agent is citric acid monohydrate. The method for repairing comprises the following specific steps that: 1, in May of the current year, planting solanum nigrum in the cadmium-polluted soil; during the growth period of the solanum nigrum, controlling aphid diseases by spraying pesticide; 2, when the solanum nigrum grows to the beginning of September, applying citric acid monohydrate to the soil according to the dosage of 0.12-0.15 kg / m < 2 >, and watering the soil according to the irrigation amount of 150 m < 3 > / hm < 2 >; and 3, , harvesting the solanum nigrum at the end of September. Aiming at the characteristics of the calcareous soil, a cadmium hyperaccumulation plant- solanum nigrum is selected as a repairing plant, and citric acid monohydrate is creatively adopted as an activating agent in order to improve the hyperaccumulation effect of the solanum nigrum on cadmium in the calcareous soil, so that the absorption of thesolanum nigrum on heavy metal cadmium in the soil is greatly promoted; and a very good phytoremediation effect is achieved.

Description

technical field [0001] The invention relates to the remediation of heavy metal polluted soil, in particular to a method for remediating calcareous cadmium polluted soil. Background technique [0002] Heavy metals generally refer to density greater than 5.5g / cm 3 metals, which are generally found in low levels in the environment and in humans, animals and plants. Commonly polluted heavy metals in soil include cadmium, chromium, lead, copper, zinc, nickel, etc. [0003] The "National Soil Pollution Survey Bulletin" issued by the former Ministry of Environmental Protection and the former Ministry of Land and Resources in 2014 shows that heavy metals are the main pollutant types in my country's soil, and the main polluting heavy metals are cadmium, mercury, arsenic, copper, lead, chromium, For zinc and nickel, the point-exceeding rates of these eight elements were 7.0%, 1.6%, 2.7%, 2.1%, 1.5%, 1.1%, 0.9% and 4.8%, respectively. The sources of soil heavy metal pollution mainly ...

AI Technical Summary

Problems solved by technology

Among these activators, except for small molecule organic acids, other activators are expensive, ranging from tens or even thousands of yuan / kg. Therefore, most of them are only used in the laboratory stage.