Biomass of Desulfovibrio desulfuricans was used to recover Au(III) as Au(0) from test solutions and from waste electronic scrap leachate. Au(0) was precipitated extracellularly by a different mechanism from the biodeposition of Pd(0). The presence of Cu(2+) ( approximately 2000 mg/l) in the leachate inhibited the hydrogenase-mediated removal of Pd(II) but pre-palladisation of the cells in the absence of added Cu(2+) facilitated removal of Pd(II) from the leachate and more than 95% of the Pd(II) was removed autocatalytically from a test solution supplemented with Cu(II) and Pd(II). Metal recovery was demonstrated in a gas-lift electrobioreactor with electrochemically generated hydrogen, followed by precipitation of recovered metal under gravity. A 3-stage bioseparation process for the recovery of Au(III), Pd(II) and Cu(II) is proposed.

译文

:使用脱硫脱硫弧菌的生物质从测试溶液和电子废废浸出液中回收作为Au(0)的Au(III)。 Au(0)通过与Pd(0)的生物沉积不同的机制在细胞外沉淀。渗滤液中Cu(2)(大约2000 mg / l)的存在抑制了氢化酶介导的Pd(II)的去除,但是在没有添加Cu(2)的情况下对细胞进行前palpalpalisation促进了Pd(II)的去除)从浸出液中去除,然后从催化溶液中自动催化去除了95%的Pd(II),其中添加了Cu(II)和Pd(II)。在具有电化学产生的氢气的气举式电生物反应器中证明了金属的回收,然后在重力作用下沉淀了回收的金属。提出了一种用于回收Au(III),Pd(II)和Cu(II)的三步生物分离工艺。

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