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Method for repairing zinc polluted soil and sludge by using aster subulatus

A technology of polluted soil and aster, which is applied in the restoration of polluted soil, biological sludge treatment and other directions, can solve the problems such as the restoration of zinc-contaminated soil and sludge, time-consuming and labor-intensive, etc., which have not yet been repaired by aster, so as to achieve wind diffusion. Strong ability, low cost, and the effect of repairing Zn content

Pending Publication Date: 2019-03-19
AGRI PROD QUALITY SAFETY & DETECTION TECH RES INST GUANGXI ZHUANG AUTONOMOUS REGION ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are rich and diverse plant species resources on the earth, it is a time-consuming and labor-intensive project to determine whether a certain plant has the characteristics of heavy metal accumulation or hyperaccumulation. Even if a lot of manpower, material and financial resources are spent, it may not be possible. Screen for ideal plant species
[0005] At present, the plants that can be used to remediate heavy metal Zn-contaminated soil mainly include cupronickel, mustard, reed, southeast sedum, Yunnan bitter vegetable, and centipede grass, etc., but there is no application of Aster persicae to remediate zinc-contaminated soil and sludge. report

Method used

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  • Method for repairing zinc polluted soil and sludge by using aster subulatus
  • Method for repairing zinc polluted soil and sludge by using aster subulatus

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The experiment was carried out in the net room greenhouse in the core area of ​​scientific research and experiment of Guangxi Academy of Agricultural Sciences.

[0022] The experiment was carried out in a barrel planting simulation method. The soil was taken from the top layer soil of the experimental field of Guangxi Academy of Agricultural Sciences, and the heavy metal Zn was added to the soil at a gradient concentration. The Asteraceae plant of the genus Asteraceae was planted in the Zn-contaminated soil by direct transplanting. . There are 5 treatments for polluted soil. The application concentration was 0 mg / kg (T0), 200 mg / kg (T1), 400 mg / kg (T2), 600 mg / kg (T3), and 800 mg / kg (T4). The applied heavy metal form is analytically pure ZnSO 4 ·7H 2 O, add soil in a solid form, fully mix well, water and soak, so that the added heavy metals and soil are fully balanced and aged, and transplanted after 1 month, each treatment is repeated 3 times, 3 plants per bucket, ...

Embodiment 2

[0029] In early April 2018, Aster subulatus Michx. was planted in the soil with heavy metal Zn pollution concentration of 456.5 mg / kg by direct seeding under natural conditions; the row spacing of direct seeding was 25 cm × 25 cm. After 120 days, harvest the aboveground part of the plant, and the heavy metal Zn content in the aboveground part is measured to be 1519.6mg / kg. Centralized ashing treatment is carried out on the harvested asters from the soil, and then the ashes are safely buried or used as raw materials for Zn extraction.

Embodiment 3

[0031] In late June 2017, by direct transplanting, Aster subulatus Michx. was planted in sludge polluted with heavy metal Zn of 855.7 mg / kg under natural conditions. The seedling height of the transplanted Aster basilica seedlings was 7-10cm, and the distance between plants and rows was 20cm×30cm. After 95 days, the aboveground part of the plant was harvested, and the heavy metal Zn content in the aboveground part was measured to be 4738.4mg / kg. Centralized ashing treatment is carried out on the harvested asters from the soil, and then the ashes are safely buried or used as raw materials for Zn extraction.

[0032] It can be seen from the above-mentioned Examples 1, 2 and 3 that the present invention can obviously absorb the heavy metal Zn in the polluted soil by planting Aster asteria in the heavy metal polluted soil, thereby achieving the purpose of effectively repairing the heavy metal Zn polluted soil and sludge.

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Abstract

The invention belongs to the field of soil and sludge pollution repair, and in particular, discloses a method for repairing zinc polluted soil and sludge by using aster subulatus. The method comprisesthe following steps: (1) aster subulatus seedlings are transplanted into the zinc polluted soil or sludge; or aster subulatus seeds are directly sown in the zinc polluted soil and sludge; (2) after the growth vigorous period of aster subulatus plants, the parts on the ground are harvested; and harvested aster subulatus is shifted out for centralized treatment; and (3) the step (2) is repeated until the growth period of the aster subulatus is finished; and the aster subulatus is pulled out from roots for centralized treatment. The method can effectively reduce the content of Zn in the pollutedsoil or sludge to achieve the purpose of repairing the content of Zn in the polluted soil or sludge, and is simple in operation, low in cost and suitable for large-area popularization and application.

Description

【Technical field】 [0001] The invention relates to the field of soil and sludge pollution restoration, in particular to a method for repairing zinc-contaminated soil and sludge by using the aster aster. 【Background technique】 [0002] In recent years, with the gradual increase in the scale of development and utilization of mineral resources, the intensification of pollution in industrial cities, and the increase in the types and quantities of agricultural chemicals, soil heavy metal pollution has become increasingly serious. Heavy metals in soil can cause immeasurable harm to human health and the ecological environment through the process of migration, transformation and enrichment and the "biomagnification" effect of the food chain. Zinc (Zn) pollution is more prominent in soil heavy metal pollution, and Zn pollution in farmland comes from a wide range of sources, including mining, waste water, waste gas, sewage irrigation, solid waste such as sludge, and agricultural chemic...

Claims

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Application Information

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IPC IPC(8): B09C1/00C02F11/02
CPCB09C1/105C02F11/02
Inventor 杨玉霞王天顺陈伟蒋文艳莫磊兴廖洁王海军李晓妤肖艳妮王彦力黄芳
Owner AGRI PROD QUALITY SAFETY & DETECTION TECH RES INST GUANGXI ZHUANG AUTONOMOUS REGION ACADEMY OF AGRI SCI
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