Study On Plant-microorganism Combined Remediation Of Vanadium Contaminated Soil

Soil is the basic environmental elements of the ecosystem,but also the source and guarantee of people's basic living.With the increasing demand for heavy metals,mineral resources have been a lot of mining,to bring people a huge economic benefits,but also undermine the ecological environment,resulting in soil pollution.Traditional repair methods usually use a single repair technology,which has some limitations,and in recent years,microbial and plant remediation technology has been widely concerned.In this paper,the effects of microbial and plant remediation on the remediation of vanadium-contaminated soil were studied.The main results are as follows:Through the investigation of the plant community in the surrounding and downstream areas of a vanadium ore smelter in Hubei Province,it was found that the species and quantity of herbaceous plants were mostly in the region,72 species were identified in these plants,Which accounted for 79.2% of herbs.A total of 22 plants with better growth,larger population and wider distribution were selected.The biomass and heavy metal contents of the plants were determined and analyzed.According to the analysis results and pre-experiment,select the vegetables and Setaria as a repair plant and microbial joint.The plants were planted in soils that were not heavily polluted by metals and analyzed by plant growth.Adding microbes to the soil could delay leaf loss.The addition of Bacillus subtilis and Bacillus megaterium to the soil can also increase the plant height of the vegetables to 82.9 mg,and the addition of Bacillus subtilis + Bacillus subtilis to the soil can also increase the plant height And biomass.By planting the newly screened microorganisms and plants in the vanadium contaminated soil,it was found that the growth of the vegetables was inhibited,but the addition of Bacillus in the soil could improve the tolerance of the vegetables to the vanadium-contaminated soil.The addition of Bacillus subtilis and Bacillus subtilis could not only improve the transport capacity of V and partial V,but also improve the enrichment ability of V,and the enrichment coefficient was increased by 2.44 times.The addition of Bacillus subtilis to the soil significantly increased the biomass of Setaria viridis and allowed the biomass to reach 479.90 mg.The addition of Bacillus subtilis to the soil increased the enrichment ability of V and V associated roots of Setaria viridis,but it did not improve the migration ability of heavy metals in Carassius auratus.In addition,it has been found that Bacillus subtilis + Bacillus megaterium can improve the content of V and V associated heavy metals in soil,and the removal rate of V can reach 26.97%.The removal rate of V and Cr in the soil was 24.07% and 15.53%,respectively,and the remediation rate of soil was better.By measuring the content of nutrient elements in the soil before and after planting plants,it was found that the soils in this area were relatively poor,and the soil fertility was increased properly before planting plants or in the middle of plant growth.It may also be beneficial to improve the microbial and plant remediation techniques.The remediation of vanadium ore contaminated soil with microbial and plant combination technology can effectively reduce the content of vanadium and vanadium in the soil.This method is simple,low cost,difficult to cause secondary pollution,has a strong application prospects.