Method for removing lead in heavy metal polluted soil by utilizing nanometer zero-valent iron and citric acid for combined elution

A nano-zero-valent iron and polluted soil technology, which is applied in the restoration of polluted soil and other directions to achieve the effects of enhancing the leaching rate, obvious leaching effect and simple operation.

Inactive Publication Date: 2014-02-26
SICHUAN AGRI UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a method for removing lead in heavy metal-contaminated soil by using nanometer zero-valent iron and citric acid combined elution to solve the problems existing in the prior art in repairing heavy metal-lead-contaminated soil

Method used

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  • Method for removing lead in heavy metal polluted soil by utilizing nanometer zero-valent iron and citric acid for combined elution
  • Method for removing lead in heavy metal polluted soil by utilizing nanometer zero-valent iron and citric acid for combined elution

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Embodiment 1

[0021] The leaching of embodiment 1 farmland lead-contaminated soil

[0022] The farmland lead-contaminated soil was collected from a polluted farmland in Wenjiang, Sichuan, and its lead content was measured to be 468.39mg / kg. Add different gradients of nano-zero-valent iron-citric acid composite solutions to the polluted soil at a liquid-solid ratio of 10:1 (ml / g), set up separate citric acid and nano-zero-valent iron leaching as controls, and wash at 170 -180r / min speed shaking and rinsing for 1h, the eluate was centrifuged at 4000r / min for 15min, the filtrate was collected through a 0.45μm filter membrane, and the Pb content in the eluent was determined by atomic absorption spectrophotometer (such as figure 1 ). Depend on figure 1 It can be seen that the leaching efficiency of single citric acid or nano-zero-valent iron to remove lead in farmland polluted soil is relatively low; the addition of nano-zero-valent iron enhances the leaching and removal of lead by citric acid...

Embodiment 2

[0023] The leaching of embodiment 2 mine lead polluted soil

[0024] The mine soil was collected near the Tangjia lead-zinc mining area in Hanyuan, Sichuan, and its lead content was determined to be 563.73mg / kg. Add different gradients of nano-zero-valent iron-citric acid composite solutions to the polluted soil at a liquid-solid ratio of 10:1 (ml / g), set up separate citric acid and nano-zero-valent iron leaching as controls, and wash at 170 -180r / min speed shaking and rinsing for 1h, the eluate was centrifuged at 4000r / min for 15min, the filtrate was collected through a 0.45μm filter membrane, and the Pb content in the eluent was determined by atomic absorption spectrophotometer (such as figure 2 ). Depend on figure 2 It can be seen that the leaching efficiency of single citric acid or nano-zero-valent iron to remove lead in mine soil is low; the addition of nano-zero-valent iron enhances the leaching and removal of lead by citric acid, and when the input amount of nano-z...

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Abstract

The invention discloses a method for removing lead in heavy metal polluted soil by utilizing nanometer zero-valent iron and citric acid for combined elution. The method comprises: adding nanometer zero-valent iron into a citric acid solution to prepare a nanometer zero-valent iron and critic acid composite solution, adding the composite solution into lead polluted soil, performing oscillation, elution and centrifuging at room temperature, then performing membrane filtration and collecting filtrate. The eluent is simple to prepare, strong in operationality and substantial in elution effect, and has the elution rate on lead of 83.08%; the lead content of eluted soil accords with soil environmental quality standards; lead in eluate can be recovered by chemical precipitation, biological adsorption and the like, and the eluate reaches discharging standards and does not cause secondary pollution to environment.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal-contaminated soil in the environment, in particular to a method for removing lead in heavy metal-contaminated soil by combined elution of nanometer zero-valent iron and citric acid. Background technique [0002] In recent years, soil heavy metal pollution has increasingly become one of the main problems endangering human life and health. Mining industry, smelting industry, electroplating industry, excessive application of fertilizers and pesticides in agriculture are the main sources of soil heavy metal pollution, especially in recent years, the non-standard treatment of electronic waste is the main cause of lead pollution. Soil heavy metal pollution can lead to the decline of soil fertility, the reduction of the yield and quality of agricultural products, and ultimately threaten the balance of the ecosystem and human health. According to reports, about 20% of the soil in my co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
Inventor 张世熔王贵胤姚苹徐小逊李婷龚国淑蒲玉琳
Owner SICHUAN AGRI UNIV
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