重金属沉渣土著微生物浸出后余渣的潜在毒性  

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

作　　者：许友泽[1] 成应向[1] 向仁军[1] 王强强[1] 李小娇[1] 

机构地区：[1]湖南省环境保护科学研究院,湖南长沙410004

出　　处：《吉首大学学报（自然科学版）》2011年第2期83-88,共6页Journal of Jishou University(Natural Sciences Edition)

基　　金：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)

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4 530,7 650,830,29 530,62 350 mg/kg降低至730,1 280,390,13 810,15 650mg/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.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,62 350 mg/kg to 730 mg/ kg, 1 280 mg/kg,390 mg/kg,13 810 mg/kg, 15 650 mg/kg respectively. Acid extractable percent content decreases remarkably during the bioleaching process;meanwhile,residual form percent content rises obvi- ously. 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 effi- ciently implement the resources and harmlessness of heavy metals in sediment.

关 键 词：重金属沉渣 土著微生物 浸出 余渣 环境活性 

分 类 号：X142[环境科学与工程—环境科学]