Method for remedying heavy metals with earthworm microcosm system

Abstract

The invention discloses a method for remedying heavy metals with an earthworm microcosm system. A plant-mycorrhiza-earthworm microecosystem is constructed, plants which are easily infected with mycorrhizae are selected according to main varieties in the area where the plants are located, strains are Glomus versiforme, an inoculant is a sand mixture containing host plant root sections, mycorrhiza fungal spores and external hyphae and takes sand as a propagation matrix, and propagules are obtained after 10 weeks of propagation with a maize and clover potting method and contain VA mycorrhiza hyphae, spores and root sections. Inoculation is performed in a local inoculation manner, the inoculation amount is 5%, Eisenia foetida is obtained from a local earthworm farm, and the properties of soil of land where the earthworms are collected are similar to experimental soil. Through the design of the plant-mycorrhiza-earthworm microecosystem and the technology of in-situ planting, construction soil heavy metal in-situ passivation and fixed-point remediation, the purpose of remedying heavy metal pollution of farmland soil is finally achieved, and a multifunctional soil conditioner is developed.

Description

technical field [0001] The invention relates to a method for repairing heavy metals, in particular to a method for repairing heavy metals by an earthworm microcosm system. Background technique [0002] Soil is the material basis for human survival, an indispensable and non-renewable natural resource for human beings, and an important part of the human environment. Soil pollution has been called "invisible pollution". As the main receiving place for heavy metals, the heavy metals contained in the soil are enriched by plants and animals in large quantities, and enter the human body through the food chain. If you eat grain, oil and its products contaminated by heavy metals for a long time, it will have certain adverse effects on the human body. Over 10 million tons of grains are reduced each year due to heavy metal pollution, and 12 million tons of grains are polluted by heavy metals every year. The total economic loss is at least 20 billion yuan, which is enough to feed more...

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Problems solved by technology

In addition, vermicompost is rich in organic matter, humus and microbial flora, which can also passivate heavy metals in polluted soil; Abdul et al. (1996) polluted three different concentrations of Cd, Cu, Fe, Pb, Zn It was found in the soil that earthworms had little effect on the availability of heavy metals, but significantly increased the content of Cd, Cu, and Zn in the above and below ground parts of ryegrass, and increased the yield of ryegrass

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