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A method for remediating lead-contaminated soil by using A. philodendron

A technology of Eclipta chinensis and lead-contaminated soil, applied in the direction of restoration of polluted soil, etc., can solve the problems of low extraction amount of heavy metals, secondary pollution, influence of heavy metal precipitation recovery rate, etc., and achieves strong viability, cost saving, The effect of a short growth cycle

Active Publication Date: 2022-04-22
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of phytoremediation compared with other pollution remediation technologies is that this remediation technology has certain aesthetics and environmental protection, but it also has certain limitations: how to treat plants harmlessly after the remediation is completed
There are two main methods of harmless treatment of plants known at present. One is to extract heavy metals from plants after ashing. Not only is the amount of heavy metals extracted very low, but secondary pollution may occur during the entire treatment process.
The other is to compost the plants, and then precipitate and recover the heavy metals in the solution after a period of treatment, but some microorganisms will be derived during the composting process, which will have some impact on the precipitation recovery rate of heavy metals

Method used

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  • A method for remediating lead-contaminated soil by using A. philodendron
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  • A method for remediating lead-contaminated soil by using A. philodendron

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Experimental program
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Effect test

Embodiment 1

[0012] lab test

[0013] Soil cultivation of Eclipta chinensis, the soil comes from the campus of China Three Gorges University, the soil is dark brown, the pH is 6.89, the water content is 19.5%, the organic matter is 16.79g / kg, and the clay is 23.41%. The soil is polluted by simulated lead Set the lead concentration in the soil to be 50±0.45mg / kg, 100±0.63mg / kg, and place a water basin in the extension direction of A. philoxeroides, so that the extension section (mainly the roots of the extension section) fully contacts the distilled water and keeps the distilled water The volume is 2L, and the lead concentration is determined after two months. The experimental results show that under the condition of low lead concentration and only two months of cultivation time, the lead concentration in the water body with a lead concentration of 50mg / kg in the soil is as high as 2.81mg / L, and the lead concentration in the water body sediment is 20.99mg / kg. kg, the lead concentration in ...

Embodiment 2

[0018] The untreated bottom sludge of electroplating plant with high lead content was selected for experiment. Before the experiment, the concentration of lead ion was determined to be 560.79 mg / kg. Due to the high salt content of the bottom sludge, the pH was 6.3 and the water content was 34.7%. Under the action of high concentration of lead ions, the growth of N. philodendron is affected. In order to survive, N. philodendron maintains its own survival needs through physiological integration and nutrients in the water basin, and at the same time releases lead ions to the water basin. To relieve the growth pressure of the soil part. After two months of cultivation, the lead concentration in the water body reached 20.06mg / L, and the lead concentration in the bottom sediment was as high as 103.12mg / kg.

Embodiment 3

[0020] Adopt technical scheme of the present invention to carry out pilot test

[0021] The lead concentration in the bottom mud pool of an abandoned electroplating factory is 214.56mg / kg. The bottom mud pool is built. The size of the bottom mud pool is 20m*5m*2m. The size of the pool is 3m*5m*2m, and the height is the same as that of the bottom mud pool. Plant philodendron philodendron about 40cm high on the bottom mud at a planting density of 50 plants / m 2 Artificially control its extension direction to make it grow towards the pool, and apply Na to the pool every six months 3 PO 4 Precipitate lead ions, the dosage is: 0.25mg / L. Repeat this for 2 years until the lead content in the soil reaches the environmental safety standards, namely the "Soil Environmental Quality Agricultural Land Soil Pollution Risk Control Standard" (GB15618-2018) and the Soil Environmental Quality Construction Land Soil Pollution Risk Control Standard (Trial) ( GB36600-2018).

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Abstract

The invention relates to a method for repairing the lead-containing bottom mud of an electroplating factory by utilizing the physiological integrity and the chemical precipitation method of philodendron philodendron. The specific steps are as follows: firstly, plant Azalea philodendron on the bottom mud of the electroplating factory, and build a reservoir 5cm beside the bottom mud pool, artificially control the growth direction of Azalea philodendron, so that it extends toward the reservoir, due to physiological integration Sexual effect, philodendron philodendron will transfer to the water body and release lead ions, after a certain period of cultivation, put Na in the water body of the reservoir 3 PO 4 Carry out precipitation recovery. The invention mainly uses the Physiologically Integrated transfer of lead ions by the Physiophthora philodendron to repair the bottom mud of the electroplating plant, and the method is simple in operation and strong in feasibility.

Description

technical field [0001] The invention relates to utilizing the physiological integration effect of the asexual propagating plant Asteria philodendron to transfer the lead ions in the soil to the water body, and to treat the lead ions in the water body through chemical precipitation, so as to repair the lead-contaminated soil and recycle the lead ions. It belongs to the field of environmental protection. Background technique [0002] While scientific and technological progress promotes economic development, ecological problems are gradually emerging. Soil is one of the material bases for the survival of human beings and organisms. With the expansion of industrial and agricultural activities, waste water continues to infiltrate into the soil, waste residues are dumped and piled on the soil surface, and waste gas mixed with dust enters the soil under the action of rain. , causing the soil to be polluted. Heavy metal refers to the density greater than 4.5g / cm 3 Heavy metals, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/105B09C1/08
Inventor 黄应平刘琪刘慧刚徐艳胥焘
Owner CHINA THREE GORGES UNIV
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