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Method for treating soil and aquatic lead, zinc, cadmium pollution by cone south mustard

A cadmium-contaminated, conical technology, applied in chemical instruments and methods, restoration of contaminated soil, biological water/sewage treatment, etc., can solve the problems of heavy metal bioavailability to be improved, heavy metal removal efficiency, and climate adaptation in different places. To achieve the effect of improving soil degradation and productivity decline, considerable economic benefits, and improving water quality

Inactive Publication Date: 2005-06-08
SUN YAT SEN UNIV
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  • Summary
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AI Technical Summary

Problems solved by technology

[0006] Judging from the current research and practical progress of plant extraction technology at home and abroad, the following problems still exist and need to be solved: (1) There are few plant species that can be selected to enrich heavy metals lead, zinc and cadmium, especially those that can enrich heavy metals at the same time. There are very few plants with more than two kinds of metals; (2) hyperaccumulators, which are recommended for priority use, generally have low biomass, low overall removal efficiency of heavy metals, and there are also problems such as climate adaptation in different places; (3) ) The bioavailability of heavy metals in contaminated soil needs to be improved; (4) In terms of application, some phytoremediation technologies in developed countries have been put into practical application and have achieved good environmental, economic and social benefits, while my country has not It is 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

[0024] Example 1: Soil Remediation

[0025] Seeds of A. paniculata were imbibed in Hoagland nutrient solution for 3 hours, placed in a dark place for 4 days to germinate, and then cultivated in normal soil in a greenhouse with a relative air humidity of 60% and a temperature of 25°C. When the seedlings of A. paniculata grow to 3-5cm, transplant them into heavy metal-contaminated soil. The background content of heavy metals in the soil: lead> 500mg / kg, zinc> 1000mg / kg, cadmium> 10mg / kg, apply lime to adjust the pH to 6-7 , row spacing 15cm, plant spacing 10cm. Harvest the aboveground part after 6 months of growth, and leave stubble of 4 to 5 cm. For the first harvest of A. paniculata, the content of heavy metals in the dry weight of the aboveground part was determined as follows: Pb>100mg / kg, zinc>3000mg / kg, cadmium>100mg / kg; A. paniculata continues to grow and continuously extracts soil lead and zinc , cadmium, continuous harvesting of the shoots of A. paniculata, the conten...

Embodiment 2

[0026] Example 2: Water restoration

[0027] The seedlings transplanted in the field are cultivated in the normal soil of the greenhouse, the relative air humidity is 60%, and the temperature is 25°C. After the seedlings grow to 3-5cm, 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. Hole, directly in contact with polluted water, add sponge in the small hole to stabilize the plant in the early stage of growth; the background content of heavy metals in the water: lead> 20mg / L, zinc> 100mg / L, cadmium> 10mg / L, add lime to adjust the pH to 6~ 7; row spacing 15cm, plant spacing 15cm. Harvest the aboveground part after growing for four months, leaving 3 to 4 cm stubble. After determination, the content of heavy metals in the dry weight of the harvested A. paniculata: lead > 2000mg / kg, zinc > 5000mg / kg, cadmium > 100mg / kg; continuous extraction of lead, zinc and cadmium fro...

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Abstract

A process for eliminating the pollution of Pb, Zn and Cd to said and water by use of arabis paniculata features that the Arabis paniculata is planted in the polluted sol or water for absorbing Pb, Zn 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 no the ground and further cutting it out.

Description

technical field [0001] The invention relates to a method for using Arabis Paniculata to remediate single or compound pollution of lead, zinc and cadmium in soil and water. Background technique [0002] Soil and water pollution with toxic heavy metals (lead, zinc, cadmium, etc.) poses a major environmental and human health concern. my country is rich in lead, zinc, and cadmium mineral resources. Due to the natural weathering of ore bodies rich in lead, zinc, and cadmium, the corresponding open-pit mining, smelting and other mining activities, as well as the extensive use of chemical fertilizers, pesticides and other chemical products, my country's large-scale Heavy metals such as lead, zinc, and cadmium pollute the soil and water bodies of the entire area, especially in areas around mines and smelters. Excessive exposure of lead, zinc, and cadmium directly threatens the living environment and food safety. The above three metals, which are ingested in large quantities through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10C02F3/32
Inventor 仇荣亮汤叶涛曾晓雯方晓航杜锁军
Owner SUN YAT SEN UNIV
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