Method for treating soil and aquatic lead, zinc, cadmium pollution by long pubescence potentilla chinensis

A technology of cadmium pollution and hair commission, applied in chemical instruments and methods, restoration of polluted soil, biological water/sewage treatment, etc., can solve the problem of low overall removal efficiency of heavy metals, improvement of bioavailability of heavy metals, and few species of super-accumulative plants and other issues, to achieve the effect of improving soil degradation and productivity decline, considerable economic benefits, and improving soil biodiversity

Inactive Publication Date: 2005-06-08
SUN YAT SEN UNIV
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Judging from the current research and practice progress of plant extraction technology at home and abroad, the following problems still exist and need to be solved: (1) Except for Ni, there are few species of hyperaccumulative plants for other heavy metals, (2) hyperaccumulators are common The biomass is low, the overall removal efficiency of heavy metals is low, and there are still problems such as climate adaptation in different places; (3) The bioavailability of heavy metals in polluted soil needs to be improved; (4) From the perspective of application, plants in developed countries Restoration technology has been put into practical application and has achieved good environmental, economic and social benefits, while our country is still in its infancy, and related technologies are still in the laboratory or pilot stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Soil Remediation

[0023] Potentilla villosa seedlings were collected in the mining area and transplanted into the polluted soil in the mining area. The background content of heavy metals in the soil: zinc>5000mg / kg, lead>5000mg / kg, cadmium>20mg / kg. The row spacing is 15cm, and the plant spacing is 10cm. After growing for 3 months, the shoots are harvested, and the stubble is 2 to 3 cm. The content of various heavy metals in the dry weight of the aboveground part of Potentilla villosa harvested for the first time was determined: zinc> 4000mg / kg, the maximum can reach 8529mg / kg, lead> 1000mg / kg, cadmium> 50 mg / kg; Potentilla villosa grows continuously, extracts zinc, lead, and cadmium from the soil, and continuously harvests the aboveground parts of Potentilla villosa. The content of zinc, lead, and cadmium in the soil continues to decrease until the content of zinc, lead, and cadmium in the polluted soil decreases. To the normal soil level, soil zinc, lead,...

Embodiment 2

[0024] Example 2: Water restoration

[0025] The seedlings transplanted in the field are cultivated in the nutrient soil in the greenhouse, the relative air humidity is 60%, and the temperature is 25°C. After the seedlings grow to 5-7cm, they are transplanted into the floating bed set in the heavy metal polluted water body, and the roots pass through the small holes drilled on the floating bed. The holes are directly in contact with the polluted water body. In the early stage of growth, sponges are added to the small holes to stabilize the plants; the water body is continuously aerated with pumps. Background content of heavy metals in water: Zinc > 10mg / kg, lead > 10mg / kg, cadmium > 10mg / kg, add sodium hydroxide to adjust pH to about 6; row spacing 15cm, plant spacing 15cm. Harvest the aboveground part after growing for one month, leaving 2 to 3 cm of stubble. After determination, the heavy metal content in the dry weight of the aboveground part of the harvested Potentilla vi...

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Abstract

A process for eliminating the pollution of Zn, Pb and Cd to soil and water by use of Potentilla griffithii features that the Potentilla griffithii is planed in the polluted sol or water for absorbing the Zn, Pb and Cd. When their concentrations in the plant reach a certain value, the plant on the ground is cut out and its root is retained for growing the plant on the ground and further cutting it out.

Description

technical field [0001] The invention relates to a method for repairing soil and water body zinc single pollution or zinc, lead and cadmium compound pollution by using Potentilla griffithii. Background technique [0002] Due to the hidden, long-term and irreversible characteristics of soil heavy metal pollution, it is difficult to control once it is polluted. Currently used physical or chemical methods such as soil solidification, vitrification, leaching, soil washing, guest soil, and electrochemical methods are not only very expensive and difficult to use on a large scale, but also often lead to the destruction of soil structure and the decline of soil biological activity. and soil fertility degradation. Therefore, finding an alternative method that is cheap, permanent and effective, and can maintain soil fertility has always been a difficult and hot research topic in the world. [0003] Metal-contaminated phytoremediation is a general term for technologies that use natura...

Claims

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Application Information

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IPC IPC(8): B09C1/10C02F3/32
Inventor 仇荣亮方晓航汤叶涛杜锁军曾晓雯蔡信德
Owner SUN YAT SEN UNIV
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