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
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[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...
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[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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