Remediation method for lead contamination in mine soil

A lead-contaminated soil technology, applied in the field of bioremediation of lead-contaminated soil, can solve the problems of small distribution range, small biomass, lack of research, etc., and achieve the effect of restoring ecological vegetation, easy survival, and strong operability

Inactive Publication Date: 2011-09-21
SICHUAN AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many studies mainly focus on screening and using hyperaccumulator plants to efficiently absorb heavy metals in soil, but because lead in soil is not easily absorbed by plants, lead hyperaccumulator plants have not bee

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] Example 1:

[0014] This embodiment is a method for repairing lead pollution in mine soil, and the specific method is as follows:

[0015] The sampling area is located at the lead-zinc mine in Ya'an City, Sichuan Province, which ceased mining in 2003. The total lead content in the tailings area is 263-9978mg·kg -1 , Effective state lead content 56-274mg·kg -1 , The pH is between 5.88-7.55, and the altitude is 1358-1445m. The soil type in the area is yellow soil, the soil surface is covered by slag, and the plants are mainly herbaceous plants.

[0016] Through the investigation of the lead-zinc tailings area from 2007 to 2009, samples were taken during the early, vigorous and late growth stages of plant growth for analysis. The results showed that Athyrium chinense in the soil of the mine had a lead content of 15542 mg·kg in the roots of the two periods before growth. -1 And 10720mg·kg -1 , Its above-ground content is low, the transport coefficient is 0.04, showing a strong r...

Example Embodiment

[0017] Example 2

[0018] In this example, Athyrium sinophylla was used as the experimental material, and its advantages of stably repairing lead-contaminated soil and its corresponding physiological mechanism were further verified through indoor potted plant control experiments. The test soil was taken from the fluvo-aquic soil in Daxing Town, Yucheng District, Ya'an City (1- 10cm), after removing the rocks, the soil is passed through a 2mm sieve for use. The test accurately weighs 7.5kg of soil and puts it into a plastic square box of 400mm×300mm×140mm. Exogenous lead is Pb(NO 3 ) 2 , Processing concentration is 0, 200, 400, 600, 800 and 1000mg Pb·kg -1 Each test treatment is arranged randomly and repeated six times. Four weeks before planting the plants, the potting soil is applied with 0-1000mg Pb·kg at the above concentration -1 , After mixing and equilibrium 4, the exchangeable lead content in the soil is 2.34-35.31mg·kg -1 , The total lead content is 35.34-1091.34mg·kg -1 ...

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PUM

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Abstract

The invention relates to a biological remediation method for lead-contaminated soil, and in particular relates to a remediation method for lead contamination in mine soil. The remediation method for lead contamination in mine soil is characterized by comprising the following steps: planting athyrium wardii in the lead-contaminated mine soil; directly planting the athyrium wardii or directly seeding and growing; and regularly harvesting the aboveground parts of the planted athyrium wardii while leaving stubble; or one year later, recovering the entire plants and seeding or cutting seedlings. The method provided by the invention plants the athyrium wardii in the lead-contaminated soil according to the lead enrichment property of the athyrium wardii root, and absorbs and fixes lead in the mine soil so as to realize stable remediation of the lead-contaminated soil of the mine area. As the athyrium wardii has great vitality, is easy to survive and does not require special management during the growth, the cost is very low and the operability is high. Meanwhile, athyrium wardii also can restore the ecological vegetation of the mine area and beautify environment.

Description

technical field [0001] The invention relates to a bioremediation method for lead-contaminated soil, in particular to a method for remediating lead pollution in mine soil. Background technique [0002] Lead pollution in my country mainly comes from the production of batteries, primary lead smelting process and secondary lead industry. Lead-containing pollutants enter the soil environment through sewage irrigation, sludge utilization, pesticide and fertilizer application, atmospheric deposition, etc., causing serious soil pollution. Especially for Pb-containing mining areas or tailing ponds, due to the low chance of reclamation and difficulty in reuse, it will affect the yield and quality of crops in the surrounding environment, and even endanger human health through the food chain. Therefore, finding an economical and efficient lead-contaminated soil remediation technology has become a hot topic of concern and research by scholars. [0003] The traditional engineering measu...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 郑子成王永东李廷轩余海英张锡洲邹同静
Owner SICHUAN AGRI UNIV
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