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Phytoremediation method for cadmium-zinc compound contaminated soil

A technology of complex pollution and polluted soil, which is applied in the field of phytoremediation of zinc-cadmium compound-contaminated soil, to achieve the effects of small soil damage, increased soil fertility, and less environmental disturbance

Inactive Publication Date: 2015-07-22
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no literature report on the use of this plant to remediate polymetallic contaminated soil at home and abroad, and there is no literature report on the use of this plant to remediate zinc and cadmium compound contaminated soil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Soil samples and mugwort plant samples were collected from the Shenyang smelter (the smelter factory area has long been polluted by heavy metals discharged during its production process), and the survey points with different pollution levels were selected to collect surface soil (1-10cm) and mugwort plant samples respectively. Different parts (roots, stems, leaves and flowers and fruits). The collected soil samples were naturally air-dried, smashed, and the debris was removed and passed through a 2mm sieve to determine the contents of heavy metals zinc and cadmium in the soil. All parts of the plant samples were rinsed to remove impurities, drained, killed at 105°C for 30 minutes, and then dried in an oven at 70°C until constant weight. The dried plant samples were weighed separately, and then the roots, stems, leaves and inflorescences were fully ground, so that they all passed through a 60-mesh nylon sieve, and the content of heavy metal zinc and cadmium in each part ...

Embodiment 2

[0021] The soil collected from the sewage irrigation area was naturally air-dried, crushed, removed of impurities and passed through a 2 mm sieve, weighed 1500 g and put into a plastic basin. Add bio-organic fertilizer, urea, potassium dihydrogen phosphate and potassium sulfate to the soil, and apply a small amount of calcium magnesium phosphate fertilizer, so that the mass ratio of the main nutrients nitrogen, phosphorus, and potassium in the soil is 4:2:3 in turn, and the regulation Soil organic C is 4%, and the percentages of calcium, magnesium, and sulfur nutrients are 1.5%, 1.0%, and 0.05% respectively; it is used to supplement the content of nutrients and trace elements in the soil, improve the status of soil organic matter and physical structure characteristics, and provide plant growth Provides optimal nutrient content. After applying the fertilizer, mix it well, and after a week of balancing, transplant the Artemisia mugwort seedlings that have grown 2 true leaves, gr...

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Abstract

The invention relates to a phytoremediation method for cadmium-zinc compound contaminated soil. The phytoremediation method comprises the following steps: weighting 1500 g of the contaminated soil, and putting into a plastic basin; adding a bio-organic fertilizer, urea, monopotassium phosphate and potassium sulphate into the contaminated soil, and applying a small amount of a calcium-magnesia phosphate fertilizer, so that the mass ratio of the main nutrient elements, namely nitrogen, phosphorus to potassium, is (4-2):(2-1):(3-1), the proportion of soil organic carbon is adjusted to be 3-5%, and the proportions of the main nutrient elements, namely nitrogen, phosphorus and potassium, are 1.5%, 1.0% and 0.05% respectively; transplanting mugwort seedlings with three seedlings every pot; regularly watering, shearing the upper parts of the mugwort along the soil surface three months later, collecting plant root samples, and conducting determination analysis on the content of cadmium in soil and all plant parts. The phytoremediation method is high in absorption capacity, high in concentration coefficient, high in transfer coefficient, capable of preventing pollutant dispersion and secondary pollution on underground water, safe and efficient.

Description

technical field [0001] The invention relates to a phytoremediation method for zinc-cadmium composite polluted soil, in particular to a method for bioremediation of zinc-cadmium composite polluted soil by using compositae plants with high absorption capacity for zinc and cadmium elements. Background technique [0002] Cities in northern China have typical characteristics of heavy industry regions, and soil heavy metal pollution is very serious. Among them, the combined pollution of zinc and cadmium has become a type of heavy metal combined pollution that has attracted much attention due to its high toxicity and high mobility. Therefore, the remediation of zinc and cadmium composite polluted soil has become an urgent problem to be solved in my country's contaminated soil remediation and sustainable soil utilization. [0003] In the remediation and treatment of heavy metal-contaminated soil, phytoremediation has been widely used due to its advantages of high efficiency, low cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 李法云巴晓博范志平王艳杰王博
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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