Biologically-induced precipitation of sphalerite-wurtzite nanoparticles by sulfate-reducing bacteria: Implications for acid mine drainage treatment

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• 作者：Julio Castillo^a ; Rafael Pé ; rez-Ló ; pez^a ; ^b ; ^{rafael.perez@dgeo.uhu.es} ; Manuel A. Caraballo^a ; ^c ; José ; M. Nieto^a ; Mó ; nica Martins^d ; M. Clara Costa^d ; Manuel Olí ; as^e ; Juan C. Ceró ; n^e ; Ré ; mi Tucoulou^f
• 关键词：Sulfate-reducing bacteria (SRB) ; Zinc tolerance ; ZnS nanocrystals ; Treatment ; Acid mine drainage
• 刊名：Science of the Total Environment
• 出版年：2012
• 期刊代码：63_00489697
• 类别：env
• 出版时间：15 April, 2012
• 卷：423
• 期：Complete
• 页码：176-184
• 文件大小：1509 K

摘要

Several experiments were conducted to evaluate zinc-tolerance of sulfate-reducing bacteria (SRB) obtained from three environmental samples, two inocula from sulfide-mining districts and another inoculum from a wastewater treatment plant. The populations of SRB resisted zinc concentrations of 260 mg/L for 42 days in a sulfate-rich medium. During the experiments, sulfate was reduced to sulfide and concentrations in solution decreased. Zinc concentrations also decreased from 260 mg/L to values below detection limit. Both decreases were consistent with the precipitation of newly-formed sphalerite and wurtzite, two polymorphs of ZnS, forming < 2.5-渭m-diameter spherical aggregates identified by microscopy and synchrotron-渭-XRD. Sulfate and zinc are present in high concentrations in acid mine drainage (AMD) even after passive treatments based on limestone dissolution. The implementation of a SRB-based zinc removal step in these systems could completely reduce the mobility of all metals, which would improve the quality of stream sediments, water and soils in AMD-affected landscapes.