Anaya-Garzon Juan, Hubau Agathe, Joulian Catherine, Guezennec Anne-Gwénaëlle
Bureau de Recherches Géologiques et Minières, Orléans, France.
Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris, Paris, France.
Front Microbiol. 2021 Aug 18;12:669738. doi: 10.3389/fmicb.2021.669738. eCollection 2021.
Bioleaching is a promising strategy to recover valuable metals from spent printed circuit boards (PCBs). The performance of the process is catalyzed by microorganisms, which the toxic effect of PCBs can inhibit. This study aimed to investigate the capacity of an acidophilic iron-oxidizing culture, mainly composed of , to oxidize iron in PCB-enriched environments. The culture pre-adapted to 1% (w/v) PCB content successfully thrived in leachates with the equivalent of 6% of PCBs, containing 8.5 g L Cu, 8 g L Fe, 1 g L Zn, 92 mg L Ni, 12.6 mg L Pb, and 4.4 mg L Co, among other metals. However, the inhibiting effect of PCBs limited the microbial activity by delaying the onset of the exponential iron oxidation. Successive subcultures boosted the activity of the culture by reducing this delay by up to 2.6 times under batch conditions. Subcultures also favored the rapid establishment of high microbial activity in continuous mode.
生物浸出是从废旧印刷电路板（PCBs）中回收有价金属的一种很有前景的策略。该过程的性能由微生物催化，而多氯联苯的毒性作用会对微生物产生抑制。本研究旨在调查一种主要由嗜酸铁氧化培养物在富含多氯联苯的环境中氧化铁的能力。预先适应1%（w/v）多氯联苯含量的培养物在含有相当于6%多氯联苯的渗滤液中成功生长，该渗滤液含有8.5 g/L铜、8 g/L铁、1 g/L锌、92 mg/L镍、12.6 mg/L铅和4.4 mg/L钴以及其他金属。然而，多氯联苯的抑制作用通过延迟指数铁氧化的开始来限制微生物活性。连续传代培养通过在分批条件下将这种延迟减少多达2.6倍来提高培养物的活性。传代培养也有利于在连续模式下快速建立高微生物活性。
