Abstract：
:A new strategy of three-step adaptive laboratory evolution (ALE) was developed to enhance the bioleaching performance of moderately thermophilic consortia. Through consortium construction, directed evolution and chemostat selection, an improved consortium (ALEend) that composed of Leptospirillum ferriphilum (80.32%), Sulfobacillus thermosulfidooxidans (15.82%) and Ferroplasma thermophilum (3.86%) was obtained, showing ferrous iron oxidation rate of 500 mgL-1h-1 and biomass production of 2.0 × 108 cells/mL at pH 0.75. During batch culturing, the ALEend consortium exhibited stable ferrous iron oxidation in wider conditions. PCA indicated that the communities were similar under fluctuating culture conditions, which demonstrated the stable community structure and the reinforced synergistic interactions resulting in the enhanced community performance. Pyrite bioleaching conducted at pH 1.5 and 0.75 revealed that the ALEend consortium extracted 26% and 55% more total iron relative to the original consortium. These findings indicated that the modified ALE may be a promising strategy for microbial community modification to enhance bioleaching.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Liu R,Chen Y,Tian Z,Mao Z,Cheng H,Zhou H,Wang Wdoi
10.1016/j.biortech.2019.121416subject
Has Abstractpub_date
2019-09-01 00:00:00pages
121416eissn
0960-8524issn
1873-2976pii
S0960-8524(19)30646-7journal_volume
287pub_type
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