Method for improving heavy metal contaminated soil through earthworm-plant coupling

A technology that pollutes soil and heavy metals, applied in the field of pollution control, can solve problems such as the inability to be applied in actual production

Active Publication Date: 2019-05-21
YUNNAN UNIV
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  • Method for improving heavy metal contaminated soil through earthworm-plant coupling
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  • Method for improving heavy metal contaminated soil through earthworm-plant coupling

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Embodiment

[0037] Using corn and Eisenia chinensis as experimental materials, the microcosm system was established to study the vertical distribution of earthworms in the soil under four different concentrations of cadmium stress, thus proving that the use of earthworms and plants can improve high-concentration cadmium-contaminated soil.

[0038] Test soil, earthworms and plants

[0039] After the test soil was air-dried, it was ground through a 2mm mesh sieve, and the soil and humus were mixed at a ratio of 1:0.5 to adjust the soil moisture content to 60%. Earthworms are selected with obvious rings, and the individual mass is 250mg-400mg adult Eisenia chinensis, and they are placed in the test soil for pre-cultivation before inoculation.

[0040] Test design

[0041] The test is a microcosm system cultivation test, using an experimental device with a diameter of 20cm, a height of 30cm, and an openable bottom cover, with 10cm as a soil layer, and each device is loaded with 7.5kg of soil...

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Abstract

The invention provides a method for improving heavy metal contaminated soil through earthworm-plant coupling. The method includes the steps of firstly, normally mining a heavy metal mine lot, and evenly scattering corn straw, straw and other organic matter smashed particles on surface layer soil by the coverage thickness of 15 cm; secondly, plowing and preparing the soil and the organic matter smashed particles covering the upper layer through a plowing machine; thirdly, smashing and refining the soil plowed in the second step through a soil preparing machine, mixing the refined soil with organic matter, and controlling the particle size at 2-5 mm; fourthly, spraying a sodium hypochlorite solution with a certain concentration on the soil in the third step, conducting disinfecting and adjusting the soil water content; fifthly, selecting eisenia fetida obviously with the clitellum individual mass of 250-400 mg, putting the eisenia fetida into the soil processed in the fourth step, and scattering a certain number of herbaceous plants with robust plant root systems. The life habits of earthworms and fertilizer tendency of the plants are sufficiently used for processing the bare earth surface in the heavy pollution area, and the method has the quite positive effects.

Description

technical field [0001] The invention belongs to the technical field of pollution control, and in particular relates to a method for inoculating earthworm-plants in heavy metal polluted soil to improve soil. Background technique [0002] With the development of industry, agriculture and social economy, the pollutants produced in the agricultural production process are continuously enriched in the soil, which greatly endangers the stability of the soil ecosystem. Among all kinds of soil pollutants, heavy metals are the most harmful to the soil ecosystem due to their high toxicity, refractory degradation, and bioaccumulation effect. Soil heavy metal pollution has attracted people's attention and has become a hot issue of global concern. [0003] Various heavy metal minerals are very rich. According to the survey bulletin on soil pollution, the rate of contaminated soil exceeding the standard is 16.1%. The main inorganic pollutants are cadmium, mercury, lead, copper and other ei...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 刘嫦娥段昌群潘瑛付登高王朋禹明慧秦媛儒赵永贵
Owner YUNNAN UNIV
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