Investigating critical parameters for bioremoval of heavy metals from computer printed circuit boards using the fungus Aspergillus niger

A comprehensive review of bioleaching optimization by statistical approaches: recycling mechanisms, factors affecting, challenges, and sustainability

“…There was a claim that the time (day) the sample is added to the solution is essential to Aspergillus niger's ability to recover metals. 93 Kumar et al (2018) investigated the optimization of Au and Ag recovery using Pseudomonas balearica SAE1 from the computer-printed circuit boards (CPCB). To maximize Au and Ag recovery as the responses, they used Design-Expert Soware to apply the CCD method with four factors: pulp density, temperature, initial pH, and glycine (as an additive) concentration.…”

“…There was a claim that the time (day) the sample is added to the solution is essential to Aspergillus niger ' s ability to recover metals. 93 …”

Microbial Processing of Waste Shredded PCBs for Copper Extraction Cum Separation—Comparing the Efficacy of Bacterial and Fungal Leaching Kinetics and Yields

“…A. ferrooxidans oxidizes ferrous to ferric form and A. thiooxidans has the inherent ability to oxidize the elemental sulfur (S°) to produce H2SO4 [20,[37][38][39][40]. It was reported earlier that A. niger produces different kinds of organic acids like citric acid, oxalic acid, gluconic acid when the growth medium is enriched with sucrose as the source of energy [41][42][43]. These organic acids assist in the dissolution/complexation of metals from the printed circuit board scraps.…”