吉首大学学报(自然科学版) ›› 2011, Vol. 32 ›› Issue (2): 83-88.

• 化学化工 • 上一篇    下一篇

重金属沉渣土著微生物浸出后余渣的潜在毒性

  

  1. (湖南省环境保护科学研究院,湖南 长沙 410004)
  • 出版日期:2011-03-25 发布日期:2012-04-09
  • 作者简介:许友泽(1985-),男,安徽六安人,湖南省环境保护科学研究院工程师,硕士,主要从事重金属污染综合防治技术研究.
  • 基金资助:

    湖南省科技计划重点项目(2007SK2006);国家水体污染控制与治理科技重大专项(2009ZX07212-001-02-05)

Potential Toxicity of the Residues from Indigenous Microorganisms Leaching of Heavy Metal Sediment

  1. (Hunan Research Academy of Environment Science,Changsha 410004,China)
  • Online:2011-03-25 Published:2012-04-09

摘要:

在pH值为3.0、温度为30 ℃、矿浆质量分数为7%的优化浸出条件下,通过摇瓶试验,结合X射线衍射分析、BCR法3步连续提取,研究了土著微生物浸出重金属沉渣后余渣中重金属的潜在毒性。结果表明:土著微生物浸出7 d后,沉渣中Cd,Mn,Cu,Pb,Zn含量分别由原来的4 530,7 650,830,29 530,62350 mg/kg降低至730,1280,390,13 810,15650 mg/kg.浸出过程沉渣中Cd,Mn,Cu,Pb,Zn等重金属的酸可提取态相对含量显著降低,残渣态相对含量提高.余渣环境活性和潜在危害低于《危险废物鉴别标准》(GB 5085.3-2007)的规定,土著微生物浸出能有效实现重金属沉渣的资源化和无害化.

关键词: 重金属沉渣, 土著微生物, 浸出, 余渣, 环境活性

Abstract:

Shaking flask experiments were used to study the indigenous microorganisms leaching of heavy metals from sediment in the optimum conditions,which were determined to be pH =3.0,65℃ and 7% pulp density.Residues from the bioleaching were analyzed through XRD and three-stage BCR sequential extraction procedure.Results show that heavy metal(Cd,Mn,Cu,Pb,Zn) contents sharply decrease over 7 days leaching,from 4 530 mg/kg,7 650 mg/kg,830 mg/kg,29 530 mg/kg,62350 mg/kg to 730 mg/kg,1280 mg/kg,390 mg/kg,13 810 mg/kg,15650 mg/kg respectively.Acid extractable percent content decreases remarkably during the bioleaching process;meanwhile,residual form percent content rises obviously.The environmental availability and potential risk of heavy metals are less than the standards listed in Hazardous Waste Distinguishable Standard (GB 5085.3-2007).Indigenous microorganisms can efficiently implement the resources and harmlessness of heavy metals in sediment.

Key words: heavy metal sediment, indigenous microorganisms, leaching, residues, environmental availability bility

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