Bacterial Strains Recover Metals From Circuit Boards
Researchers demonstrated a bioleaching process that captures precious metals from electronic waste in a five-day cycle.
Updated on Sept. 18, 2026 in Life Sciences
Live Poll
Do you believe we should prioritize biological methods for recycling metals from our old electronics?
Laboratory researchers have evaluated three specific bacterial strains for their efficacy in extracting metals from printed circuit boards. The study provides a comparison between bioleaching performance and life cycle environmental impacts.
Why it matters
Traditional metal recovery methods are energy-intensive and environmentally hazardous, necessitating the development of cleaner biological alternatives. This research provides a quantitative foundation for shifting toward microbial-based recycling technologies.
The study achieved 95.55% copper recovery using Exiguobacterium himgiriensis and 96.77% silver recovery using Arthrobacter gandavensis. These metrics were measured over a 5-day duration at 37 degrees Celsius with 5 grams per liter of printed circuit board loading.
The players
Exiguobacterium himgiriensis
A bacterial strain identified in the study as capable of recovering 95.55% of copper from electronic waste.
Arthrobacter gandavensis
A bacterial strain demonstrated to achieve 96.77% silver recovery, 86.75% iron recovery, and 95.63% manganese recovery.
Enterobacter quasihormaechei
A bacterial strain shown in experimental results to recover 61.07% of zinc from printed circuit boards.
The details
Researchers employed bioleaching, a process where microorganisms dissolve and extract minerals from solid materials, to process printed circuit boards. Performance was quantified using Inductively Coupled Plasma Optical Emission Spectroscopy, a technique that measures elemental concentrations by vaporizing a sample. The team also used X-ray diffraction, which analyzes crystalline structures, to identify physicochemical changes in the material during the extraction.
Timeline
September 18, 2026: The research article was published.
The Tech Race
This research provides a biological alternative to the environmental impacts of conventional e-waste smelting and hydrometallurgical refining. It moves the field toward decentralized, low-energy recycling as a competitive response to carbon-intensive industrial metal recovery.
This study remains in the laboratory research phase and does not currently impact commercial electronic waste recycling workflows. Industry adoption will depend on scaling these specific bacterial recovery rates to meet the throughput demands of industrial-sized refining facilities.
The takeaway
The study demonstrates that targeted microbial strains can achieve high-efficiency recovery of critical metals from circuit board waste. Future research must determine if these bench-top efficiencies hold true when scaled to industrial operations with significantly higher loading volumes.
Further reading
Explore the latest developments in sustainable biotechnology within Life Sciences.
Source note: This article includes information reported by Nature.
Live Poll
Do you believe we should prioritize biological methods for recycling metals from our old electronics?
