Phytoremediation method for combined pollution of Cd, Zn and Cu in river dredging sediment

A phytoremediation and river dredging technology, applied in water pollutants, polluted waterways/lakes/ponds/river treatment, chemical instruments and methods, etc., can solve the problems of heavy metal Cd, Zn, Cu composite pollution, etc.

Inactive Publication Date: 2020-04-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to provide a phytoremediation method for the compound pollution of Cd, Zn and Cu in the dredged sediment

Method used

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  • Phytoremediation method for combined pollution of Cd, Zn and Cu in river dredging sediment
  • Phytoremediation method for combined pollution of Cd, Zn and Cu in river dredging sediment
  • Phytoremediation method for combined pollution of Cd, Zn and Cu in river dredging sediment

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Experimental program
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Embodiment 1

[0018] The test sediment was taken from a river dredged in Shanghai, and the content of three heavy metals, Cd, Zn, and Cu, exceeded the risk screening value.

[0019] Select Calendula officinalis, Elymus chinensis, Barnyard grass, Sedum babao, and Dawufengcao as the test plants for single species. Among them, the three kinds of plant seeds of Calendula officinalis, Elymus chinensis and Barnyard grass were all purchased from the Internet, and the purchased plant seeds were all common and common varieties. Dawu Fengcao is collected from the park. Sedum babao seedlings were cut along their stems from the non-pollution culture pots for testing.

[0020] Before sowing plants, sprinkle water to wet the surface of the bottom mud, and use a small rake to fully plow the topsoil. According to the sowing amount of plant seeds in Table 1, three kinds of plant seeds of Calendula officinalis, Elymus chinensis and Barnyard grass with full particles and basically the same size were selecte...

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Abstract

The invention discloses a phytoremediation method for combined pollution of Cd, Zn and Cu in riverway dredging sediment. The method comprises the following steps: 1, before sowing, sprinkling water towet the surface layer of sediment, and fully plowing the surface soil, and 2, carrying out plant selection through selecting calendula officinalis, elymus nutans and barnyard grass plant seeds whichare full in particle and basically consistent in size, evenly spraying them into corresponding test boxes, then covering the test boxes with sieved sediment, carrying out single planting and respectively and uniformly transplanting Farfugium japonicum and Sedum spectabile Boreau into the test box. According to the method, the single of calendula officinalis, elymus nutans, barnyard grass, Sedum spectabile Boreau and Farfugium japonicum is selected, the remediation effect on heavy metal Cd, Zn and Cu combined pollution of the river dredging sediment is good, the root lengths of elymus nutans and the barnyard grass are 20-25 cm and 25-29 cm respectively, and the heavy metal polluted sediment with the depth of 0-30 cm can be remediated.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal pollution in river dredging bottom mud, in particular to a phytoremediation method for compound pollution of Cd, Zn and Cu in river dredging bottom mud. Background technique [0002] River dredging sediment usually contains heavy metal pollutants, and resource utilization will cause secondary pollution. Measures are usually taken to reduce biological toxicity and then be safely landfilled. The dredged sediment of the river channel contains a lot of nutrients, and the direct landfill not only takes up a lot of land resources, but also causes a waste of resources. This patent proposes the method of phytoremediation to reduce the toxicity of heavy metals and realize the resource utilization of sediment for river dredging sediments polluted by low-concentration heavy metals. [0003] At present, phytoremediation technology is selective for heavy metals, and hyperaccumulator plants ...

Claims

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Application Information

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IPC IPC(8): C02F11/02C02F101/20
CPCC02F11/02C02F2101/20C02F2103/007
Inventor 刘晓艳沈佳怡章长松藏学珂张新颖李辈辈曹丽亚黄洵张申钰
Owner SHANGHAI UNIV
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