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Heavy Metal Tolerance and Removal by Bacteria Isolated from Marquez Crater Soil

机译:从Marquez陨石坑土壤分离的细菌对重金属的耐受性和去除

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摘要

Uncontrolled discharge of industrial waste water into natural water resources, hospital waste drainage and other anthropogenic activities release tremendous amounts of heavy metals in the environment, especially in water bodies. The accumulation of these toxic metals in the food chain causing health hazards to all aquatic and terrestrial animals is of greater concern these days. This study was conducted to find an effective and safe bioremediation tool for heavy metal pollution using naturally occurring bacteria. Four bacterial isolates were identified from the soil of Marquez Crater, a meteorite impact area. The isolates were inoculated into media containing increasing concentrations of iron, copper, nickel and zinc to determine the maximum tolerance for each heavy metal. All isolates showed low maximum tolerance for zinc (20, 10, 10 and 10 mg/L) and nickel (20, 10, 20 and 20 mg/L) when compared to iron (100, 50, 50 and 50 mg/L), and copper (75, 20, 50 and 40 mg/L). Optimum temperatures and pH for each isolate varied from 25 to 37°C and from 7 to 9 respectively. The order of removal efficiency for heavy metals was Fe>Zn>Cu>Ni. Isolate I-2 was particularly effective in removing 91.69% of iron. Results showed the potential of isolates to be effective in removing toxic metals from sewage, drainage, industrial effluents, and other polluted water sources to grow in a range of temperature.
机译:不加控制地将工业废水排放到天然水资源,医院废水排放和其他人为活动中,在环境中,尤其是水体中释放出大量重金属。这些有毒金属在食物链中的积累对所有水生和陆生动物造成健康危害,这些天来越来越引起人们的关注。进行这项研究是为了找到一种有效且安全的生物修复工具,以利用天然细菌对重金属进行污染。从陨石撞击区Marquez Crater的土壤中鉴定出四种细菌分离株。将分离株接种到含有递增浓度的铁,铜,镍和锌的培养基中,以确定每种重金属的最大耐受性。与铁(100、50、50和50 mg / L)相比,所有分离株对锌(20、10、10和10 mg / L)和镍(20、10、20和20 mg / L)的最大耐受性均较低。和铜(75、20、50和40 mg / L)。每个分离物的最佳温度和pH分别在25至37°C和7至9之间变化。重金属去除效率的顺序为Fe> Zn> Cu> Ni。分离物I-2对去除91.69%的铁特别有效。结果表明,分离株可能有效去除污水,排水,工业废水和其他污染水源中的有毒金属,使其在一定温度范围内生长。

著录项

  • 作者

    Shrestha, Manisha.;

  • 作者单位

    Lamar University - Beaumont.;

  • 授予单位 Lamar University - Beaumont.;
  • 学科 Chemistry.;Microbiology.
  • 学位 M.S.
  • 年度 2018
  • 页码 64 p.
  • 总页数 64
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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