Method for regulating and controlling intercropping of sedum plumbizincicola and astragalus sinicus to restore farmland soil subjected to combined pollution of heavy metal and organic pollutants

Abstract

The invention discloses a method for regulating and controlling intercropping of sedum plumbizincicola and astragalus sinicus to restore farmland soil compositely polluted by heavy metal and organic pollutants. The method comprises the following steps: firstly, grinding sedum plumbizincicola with a hyperaccumulation effect on Cd, astragalus sinicus with an efficient rhizosphere degradation effect on organic pollutant PCBs, a leaf surface regulating agent abscisic acid with a growth stimulation effect on plants and a rhizobium inoculant with a promotion effect on degradation of PCBs on rhizosphere of astragalus sinicus; sedum plumbizincicola and astragalus sinicus are planted in the soil subjected to combined pollution in a greenhouse, and a pot experiment based on overground leaf surface regulation and underground rhizosphere strengthening remediation plant intercropping is carried out. The method is reasonable in design, simple to operate, economical and feasible, a bioremediation technology capable of improving the phytoremediation efficiency is ground out, and the method has the characteristics of no damage to the physical and chemical properties of the soil and no secondary pollution, can be applied to remediation of the heavy metal-organic pollutant combined contaminated soil, and has good environmental, economic and social benefits.

Description

technical field [0001] The invention relates to a bioremediation technology of polluted soil, in particular to a method for remediating complex polluted farmland soil by heavy metals and organic pollutants by using a foliage and rhizosphere strengthening system to regulate and control the intercropping of sedum sedum and milk vetch. Background technique [0002] At the end of the 20th century, the electronic and electrical waste (e-waste) dismantling industry quietly emerged in the southeast coastal areas of Taizhou, Zhejiang, and Guiyu, Guangdong. Electronic and electrical waste has high economic value, which contains a large amount of rare precious metals such as gold and silver and conventional metals such as copper and iron, and is called "urban ore". In my country's southeast coastal cities, a complete dismantling industrial chain of "scrap metal-dismantling classification-deep processing-remanufacturing" has been formed. Through the development of circular economy ind...

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Problems solved by technology

However, there are also shortcomings such as slow growth of hyperaccumulator plants, small biomass, poor adaptation of exogenous microorganisms, low repair efficiency and long repair time, which limit the practical application value of bioremediation.

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