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Method for extracting zinc from sludge continuouslly and restoring zinc pollution in soil by purple Jasmine

A purple flower jasmine and soil remediation technology, which is applied in the field of remediation of soil zinc pollution, can solve the problems of low overall removal efficiency of heavy metals, improved bioavailability, remote climate adaptation, etc., and achieves improvement of soil degradation and productivity. The effect of large biomass

Inactive Publication Date: 2009-03-25
广东省农业科学院土壤肥料研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 for enriching heavy metal zinc, especially plants with wide regional adaptability ; (2) The hyperaccumulator, which is recommended for priority use, generally has low biomass, and the overall removal efficiency of heavy metals is low, and there are also problems such as climate adaptation in different places; (3) Bioavailability of heavy metals in polluted soil (bioavailability) needs to be improved; (4) From the application point of view, some phytoremediation technologies in developed countries have been put into practical application, and have obtained good environmental, economic and social benefits, while my country is still in its infancy, and related technologies are still in the early stage. laboratory or pilot stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Soil Remediation

[0029] From February to March, the seeds of Jasmine jasmine are sown in a flat field nursery, covered with fine sand or soil, with a relative air humidity of 70-90%, and a temperature of 20°C. When the seedlings of Viola jasmine grow to 3-5 leaves, they are transplanted into heavy metal-contaminated soil. The background content of heavy metal zinc in the soil is ≥250mg / kg. After growing for 10 months, the aboveground part is harvested, and 2 to 3 nodes are left as stubble. For the Jasmine Jasmine harvested for the first time, the content of heavy metal zinc in the aboveground part was determined to be ≥328 mg / kg (dry weight). The Jasmine Jasmine continued to grow, and the soil zinc was continuously extracted. The aboveground part of Jasmine Jasmine was continuously harvested, and the zinc content in the soil continued to decrease until The zinc content in the polluted soil is reduced to the normal soil level, and the soil zinc pollution is...

Embodiment 2

[0030] Example 2: Soil Remediation

[0031] In February-March, the seeds of Jasmine jasmine are sown in heavy metal-polluted soil, covered with fine sand or soil, with a relative air humidity of 70-90%, and a temperature of 20°C. The background content of heavy metal zinc in the soil is ≥250mg / kg, and the soil pH should be kept at 6-7.5. When the purple jasmine seedlings grow to 3 to 5 leaves, keep a row spacing of 1 meter and a plant spacing of 0.5 meters. After growing for 10 months, the aboveground part is harvested, and 2 to 3 nodes are left as stubble. For the Jasmine Jasmine harvested for the first time, the content of heavy metal zinc in the aboveground part was determined to be ≥328 mg / kg (dry weight). The Jasmine Jasmine continued to grow, and the soil zinc was continuously extracted. The aboveground part of Jasmine Jasmine was continuously harvested, and the zinc content in the soil continued to decrease until The zinc content in the polluted soil is reduced to the...

Embodiment 3

[0032] Embodiment 3: sludge zinc extraction

[0033] Bury the roots of Jasmine jasmine in the sand from February to March, drenched with water every day, the relative air humidity is 60-80%, and the temperature is 20°C. After the seedlings have grown to 3-5 leaves, transplant them to soil with a zinc content of 250 mg / kg after sludge application, and keep the soil pH at 5-6; the row spacing is 1 meter, and the plant spacing is 0.5 meters. It grows for 10 months, harvests the aboveground part, and leaves 2 to 3 stubbles. It has been determined that the heavy metal zinc content in the harvested Jasmine Jasmine ≥ 328mg / kg (dry weight); Jasmine Jasmine continues to extract zinc, and the Jasmine Jasmine shoots are continuously harvested, and the zinc content of the sludge applied to the soil decreases continuously until the zinc content Reduced to the normal level, the sludge zinc reaches the agricultural discharge standard.

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Abstract

A method for extracting zinc from sludge continuously and repairing zinc pollution in soil by Mirabilis jalapa L. is carried out by taking Mirabilis jalapa L. for enriching Zinc heavy metal as material, absorbing while activating zinc in polluted soil, transferring upwardly above ground, forming upper part of Mirabilis jalapa L. into a certain of biomass live weight, reaping once a year, maintaining root tuber underground, keeping stubble for 2-3 joints, sprouting while growing in the next year and extracting continuously. It's efficient, convenient, safe and standard.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for continuously extracting zinc from sludge by using Mirabilis jalapa L. and remediating soil zinc pollution. technical background [0002] Toxic heavy metal pollution in soil and sludge has become a prominent environmental and human health problem in recent years. Dewatered sludge is the product of urban sewage treatment. At present, the amount of dry sludge produced in the world every year has exceeded 100 million tons. Sludge is rich in organic matter, nitrogen, phosphorus, potassium and other nutrients needed for plant growth. Therefore, the agriculturalization of sludge is one of the effective ways to solve a large amount of urban sludge. Along with the nutrients in the sludge, there are also heavy metal elements that enter the soil, and zinc is one of them. In addition, my country is rich in zinc mineral resources, and the natural weathering of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00C02F11/02B09C1/10
CPCY02W10/37
Inventor 黄庆柯玉诗
Owner 广东省农业科学院土壤肥料研究所
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