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OALib Journal期刊
ISSN: 2333-9721
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微小杆菌exiguobacteriumsp.mh3对六价铬的还原特性
DOI: 10.3724/SP.J.1145.2014.03013, PP. 791-797
Keywords: 微小杆菌,六价铬,还原作用,外加碳源,共存离子,废水处理
Abstract:
六价铬[cr(vi)]是毒性强、易迁移的主要重金属污染物，通过微生物将cr(vi)还原为低毒性的cr(ⅲ)是一种经济、高效的处理铬污染的方法.对从浮萍根际分离得到的微小杆菌exiguobacteriumsp.mh3的cr(vi)去除能力、方式及影响因素进行了研究.结果显示，实验条件下，菌株mh3在12h或36h内可完全去除5mgl-1或15mgl-1cr(vi).其去除机理主要为还原作用，且主要发生在细胞外侧，表明菌株mh3还原cr(vi)的酶可能为分泌型.此还原反应的最适ph为7.0.外加碳源如甘露醇、葡萄糖、蔗糖等可显著促进菌株mh3还原cr(vi).共存金属离子cu2+也可增强此还原作用，但是zn2+、mn2+、cd2+对菌株mh3生长及cr(vi)还原有抑制作用.共存阴离子po43-则可促进菌株mh3的生长及cr(vi)还原.研究表明，exiguobacteriumsp.mh3是一株高效的cr(vi)还原菌，在含铬废水处理上具有一定的应用价值.
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