Abstract：
Biomining using microalgae has emerged as a sustainable option to extract rare earth elements (REEs). This study aims to (i) explore the capability of REEs recovery from bauxite by microalgae, (ii) assess the change of biochemical function affected by bauxite, and (iii) investigate the effects of operating conditions (i.e., aeration rate, pH, hydraulic retention time) to REEs recovery. The results showed that increasing bauxite in microalgae culture increases REEs recovery in biomass and production of biochemical compounds (e.g., pigments and Ca-Mg ATPase enzyme) up to 10 %. The optimum pulp ratio of bauxite in the microalgae culture ranges from 0.2 % to 0.6 %. Chlorella vulgaris was the most promising, with two times higher in REEs recovery in biomass than the other species. REEs accumulated in microalgae biomass decreased with increasing pH in the culture. This study establishes a platform to make the scaling up of REEs biomining by microalgae plausible.
摘要：
使用微藻进行生物处理已成为提取稀土元素（REE）的可持续选择。本研究旨在(I)探索微藻从铝土矿中回收稀土元素的能力，(ii)评估受铝土矿影响的生化功能变化，和(iii)调查操作条件的影响(即，曝气速率,pH值,水力停留时间)到稀土元素恢复。结果表明，在微藻培养中增加铝土矿可增加生物质中的REEs回收率和生化化合物的产生（例如，色素和Ca-MgATP酶）高达10％。铝土矿在微藻培养中的最佳纸浆比例为0.2％至0.6％。普通小球藻是最有前途的,生物质中稀土元素的回收率是其他物种的两倍。微藻生物量中积累的稀土元素随着培养物中pH的增加而减少。这项研究建立了一个平台，使微藻生物培养REE的规模扩大是合理的。
