Cadmium-lead contaminated farmland passivation and low-accumulation plant repairing method

Abstract

The invention relates to a cadmium-lead contaminated farmland passivation and low-accumulation plant repairing method. The repairing method comprises the following steps: (1) sieving and roasting a passivating agent LDHs, and then uniformly spreading the passivating agent LDHs onto plowed cadmium and / or lead contaminated soil by using a manure spreader in batches, wherein 200-600kg of passivatingagent LDHs is applied to per mu of cadmium and / or lead contaminated soil; and step (2) sowing low accumulation corn varieties to the soil treated in the step (1), germinating, surviving, growing, absorbing the metal cadmium and / or lead in the contaminated soil by the passivating agent and corn root systems, and transferring the metal cadmium and / or lead to the overground part. The repairing methodhas the advantage that the safe production of agricultural products is realized by utilizing a heavy metal contaminated farmland passivation and low accumulation corn crop combined repairing technology.

Description

technical field [0001] The invention belongs to the field of soil pollution prevention and control, and in particular relates to a passivation and low accumulation phytoremediation method for farmland polluted by cadmium and lead. Background technique [0002] Soil is the natural environment on which human beings depend and an important resource for agricultural production. The health of the soil environment is related to the quality of agricultural products and human health. In recent years, soil heavy metal pollution has become a serious environmental problem facing the world. At present, my country's farmland soil is seriously polluted by heavy metals. According to the results of the first national soil pollution survey, the rate of soil points exceeding the standard in my country's cultivated land is 19.4%, and the proportion of slightly, lightly, moderately and heavily polluted points is 13% respectively. .7%, 2.8%, 1.8% and 1.1%. From the perspective of pollutants exce...

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Problems solved by technology

[0004] In phytoremediation technology, it is common to use hyperaccumulator plants to absorb cadmium and / or lead heavy metals in polluted soil. Minor problems limit its repair efficiency and promotion value

Moreover, hyperaccumulator plants usually need to grow in spring and summer in the south where the climate is suitable. When they are applied to farmlands polluted by medium and low heavy metals in the north, they will not only occupy farmland resources, but also limit their promotion, thereby affecting the restoration of farmland soil environmental quality.

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