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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 been found much, and their biomass is small and their growth is slow. , small distribution range and other shortcomings, the research on the application of actual lead-contaminated soil remediation is relatively lacking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The present embodiment is the method for remediating lead pollution of mine soil, and the concrete method is:

[0015] The sampling area is located in the lead-zinc mine in Ya'an City, Sichuan Province, which stopped mining in 2003. The total lead content in the tailings area is 263-9978mg·kg -1 , effective lead content 56-274mg kg -1 , The pH value 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 in the early growth period, vigorous growth period and late growth period for analysis. The results showed that the Pb content in the root of Pteris chinensis in the mine soil reached 15542 mg·kg in the first two stages of growth -1 and 10720mg·kg -1 , its shoot content is lower, the transfer coefficient is 0.04, showing a strong root lead enr...

Embodiment 2

[0018] In this example, Pteris chinensis is used as the experimental material, and the advantages and corresponding physiological mechanisms of its stable repair of lead-contaminated soil are further verified through indoor pot control experiments. The soil for testing is taken from the fluvo-aquic soil (1- 10cm), and the soil was passed through a 2mm sieve after removing stones for later use. The test accurately weighed 7.5kg of soil and put it into a plastic square box of 400mm×300mm×140mm. Exogenous lead is Pb(NO 3 ) 2 , the treatment concentration is 0, 200, 400, 600, 800 and 1000 mg Pb kg -1 , each test treatment is randomly arranged, repeated six times, four weeks before planting plants, the potting soil is applied with 0-1000mg Pb·kg according to the above concentration -1 , the exchangeable lead content in the soil after mixing and balancing 4 is 2.34-35.31mg·kg -1 , the total lead content is 35.34-1091.34mg·kg -1 .

[0019] After 4 weeks of growth, the biomass o...

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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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