Method for repairing soil and zinc and cadmium nollution in water b using Arrow leaf violet

A technology for remediation of soil and cadmium pollution, applied in chemical instruments and methods, restoration of polluted soil, biological water/sewage treatment, etc., can solve the problems of increased biological availability of heavy metals, low removal efficiency of heavy metals, and low biomass in general , to restore and improve soil biodiversity, improve soil degradation and productivity decline, and restore high efficiency

Inactive Publication Date: 2004-12-15
SUN YAT SEN UNIV
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  • Abstract
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  • Application Information

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 the heavy metals zinc and cadmium, especially those that can simultaneously enrich the two There are very few plants with the above metals; (2) The hyperaccumulators that are recommended for priority use generally have low biomass, the overall removal efficie

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Soil remediation

[0030] Ruyi grass seeds are swelled in deionized water for 5 hours, placed in a dark place for 3 days and germinated, then cultivated in normal soil in a greenhouse with a relative humidity of 60% and a temperature of 25°C. When the Ruyi grass seedlings grow to 3~5cm, they are transplanted into heavy metal contaminated soil. The background content of heavy metals in the soil: zinc>500mg / kg, cadmium>10mg / kg, adjust the pH to 6-7 by applying lime, 15cm row spacing, and 10cm plant spacing. It grows for 6 months and harvests the above ground, leaving a stubble of 4 to 5 cm. For the first harvest of Ruyi grass, the content of heavy metals in the dry weight of the above ground was determined: zinc>2000mg / kg, cadmium>50mg / kg; Ruyi grass continued to grow, continuously extract zinc and cadmium from the soil, and continue to harvest the upper part of the Ruyi grassland and soil The content of zinc and cadmium in the soil is continuously reduced until th...

Embodiment 2

[0031] Example 2: Water body repair

[0032] The seedlings transplanted in the wild are cultivated in the normal soil of the greenhouse with a relative humidity of 60% and a temperature of 25°C. After the seedlings grow to 3~5cm, they are transplanted into a floating bed set in a water body polluted by heavy metals. The roots pass through a small drill drilled on the floating bed. Hole, directly contact with polluted water body, add sponge in the small hole to stabilize the plant in the early growth stage; water body weight metal background content: zinc>10mg / Kg, cadmium>10mg / kg, add lime to adjust the pH to 6-7; row spacing 15cm, plant spacing 15cm. It grows for four months and harvests the above ground, leaving a stubble of 3 to 4 cm. After determination, the content of heavy metals in the upper dry weight of the harvested Ruyi grassland: zinc>1000mg / kg, cadmium>500mg / kg; Ruyi grass continued to extract zinc and cadmium, and continued to harvest the upper part of the Ruyi grassl...

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PUM

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Abstract

The present invention relates to method of utilizing Viola hamitoniana in repairing soil and water with zinc and/or cadmium pollution. Viola hamitoniana is utilized, which can enrich zinc, cadmium and other metals, absorb and activate zinc and cadmium and transport zinc and cadmium to overground part. The overground part of Viola hamitoniana is gathered regularly while the underground is maintained. The said method can transfer zinc and cadmium continuously from polluted soil and water until the zinc and cadmium content reaches the safety standard.

Description

Technical field [0001] The invention relates to a method for repairing soil and water body zinc and cadmium single- or compound pollution by using Viola hamiltoniana. Background technique [0002] Pollution of toxic metals (zinc, cadmium, etc.) in soil and water has caused a major environmental and human health problem. my country is rich in zinc and cadmium mineral resources. Due to the natural weathering of zinc and cadmium ore bodies, the corresponding open-pit mining, smelting and other mining activities, as well as the large-scale application of chemical fertilizers, pesticides and other chemical products, a large area of ​​soil and The pollution of heavy metals such as zinc and cadmium in water bodies is particularly serious in the areas surrounding mines and smelters. Excessive exposure to zinc and cadmium directly threaten human living environment and food safety. Through drinking water and food, the above-mentioned two metals ingested in large amounts have the effects of...

Claims

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Application Information

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IPC IPC(8): B09C1/10C02F3/32
Inventor 束文圣刘威张军蓝崇钰
Owner SUN YAT SEN UNIV
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