Method for remediating mercury-contaminated soil by combining byproduct ammonium thiosulfate with calendula officinalis

A technology of ammonium thiosulfate and calendula, which is applied in the field of phytoremediation of heavy metal-contaminated soil, can solve the problems of low mercury bioavailability, achieve low cost, promote plant growth, and reduce environmental risks

Active Publication Date: 2016-04-06
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that many plants have a certain enrichment effect on mercury, but because the bioavailability of mercury in the soil is very low, the enrichment of mercury by plants is not much, and it is necessary to enhance the absorption of mercury in the soil by plants

Method used

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  • Method for remediating mercury-contaminated soil by combining byproduct ammonium thiosulfate with calendula officinalis
  • Method for remediating mercury-contaminated soil by combining byproduct ammonium thiosulfate with calendula officinalis
  • Method for remediating mercury-contaminated soil by combining byproduct ammonium thiosulfate with calendula officinalis

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment one: the pot experiment of Calendula officinalis

[0020] 1. Experimental design and conditions:

[0021] The original soil sample used is grass vegetation soil within 0-20cm of the surface layer of the Zhongyuan green belt of Nanjing University of Information Science and Technology. The physical and chemical properties of the soil are shown in Table 1:

[0022] Table 1 Soil physical and chemical properties

[0023]

[0024] 2. Experimental design soil samples, three soil samples are as follows:

[0025] Soil 1: the above soil as it is;

[0026] Soil 2: add 2mg / kg mercury (HgCl 2 ) pollutes the soil;

[0027] Soil three: add 5mg / kg mercury (HgCl 2 ) pollutes the soil;

[0028] The above three soil samples were prepared in three groups, namely ① the control group, ② the ammonium thiosulfate compound treatment group, and ③ the ammonium thiosulfate + cytokinin compound treatment group, which were set up as shown in Table 2:

[0029] Table 2

[0030] ...

Embodiment 2

[0052]The difference from Example 1: in every kilogram of mercury-contaminated soil, apply a solution prepared by the by-product ammonium thiosulfate produced in the steelmaking wastewater treatment process of 4g, so as to absorb the excess mercury in the soil by Calendula officinalis the goal of.

Embodiment 3

[0054] The difference from Example 1: in every kilogram of mercury-contaminated soil, apply a solution prepared by the by-product ammonium thiosulfate produced in the steelmaking wastewater treatment process of 6g, so as to absorb the excess mercury in the soil by Calendula officinalis the goal of.

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Abstract

The invention discloses a method for remediating mercury-contaminated soil by combining a byproduct ammonium thiosulfate with calendula officinalis. The method comprises the following steps: planting calendula officinalis on the mercury-contaminated soil, fertilizing and watering in a planting process; when the calendula officinalis enters a flowering stage, applying a dilute solution prepared by the byproduct ammonium thiosulfate generated in steelmaking wastewater treatment process by many times, harvesting plant at the mature period of the calendula officinalis, thereby remediating the mercury-contaminated soil. At the stage of applying the solution prepared by the ammonium thiosulfate, a cytokinin solution is sprayed to the calendula officinalis plant. According to the method, the plant calendula officinalis has enrichment effect on mercury in the soil; the ammonium thiosulfate is used as a nitrogen fertilizer and a sulfur fertilizer, so that plant growth can be promoted; and mercury in the mercury-contaminated soil is activated by the ammonium thiosulfate, so that the mercury in the soil is greatly absorbed to the ground part by the calendula officinalis root system easier. The method has the advantages of being environmentally-friendly, low in cost, simple and aesthetic in process, good in treatment effect, free from secondary pollution, and easy to popularize.

Description

Technical field: [0001] The invention relates to the phytoremediation technology of heavy metal polluted soil, in particular to a method for repairing mercury polluted soil by using ammonium thiosulfate, a by-product produced in the steelmaking wastewater treatment process, and calendula officinalis. Background technique: [0002] Mercury, as a non-essentially toxic element for the human body and can be transported through the atmosphere, the inorganic mercury in it can be transformed into more fat-soluble, more toxic, and bioaccumulative organic mercury under various biological and abiotic effects . After entering the human body, mercury can damage the human nervous system, kidney system and reproductive system. Long-term exposure to low-dose mercury can cause slow movement, brain retardation, and language barriers. Due to its great harm to human health, mercury is listed as a priority pollutant by the World Health Organization. Both natural and human activities will dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/08B09C1/105B09C2101/00
Inventor 郭照冰曾钢姜文娟石磊芮茂凌
Owner NANJING UNIV OF INFORMATION SCI & TECH
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