We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Mechanism of chemical-biological coupling in an electric field-driven bioelectrochemical system for enhanced polystyrene (PS) degradation
Summary
Scientists found that adding a mild electric field to bacteria that "eat" polystyrene (a common plastic found in packaging and disposable items) sped up plastic breakdown by nearly 50% compared to bacteria alone, working by boosting the microbes' internal chemistry rather than just burning the plastic directly. This matters because polystyrene is notoriously slow to break down in nature and contributes to the microplastic pollution now found in our food, water, and even our bodies—so faster, more efficient cleanup methods could help reduce that long-term exposure.
The accumulation of recalcitrant PS presents a significant environmental challenge. However, the low efficiency of natural biodegradation limits the application of existing remediation strategies. Although bioelectrochemical systems (BES) have shown potential in enhancing pollutant removal, the synergistic mechanisms between the electric field and PS biodegradation remain unclear. This study constructed a BES to investigate the degradation of PS by Cupriavidus sp. CP313 using material characterization and integrated multi-omics analyses. Compared to the pure culture system (PS-CP, 12.78% weight loss), the BES-treated group (PS-BES) exhibited significantly enhanced surface erosion, reduced particle size, increased oxygen content, and a higher weight loss of 18.33% over 60 days. GC-MS analysis revealed shorter-chain, more highly oxidized intermediates in the PS-BES group, while long-chain alkanes that persisted in the PS-CP group were undetectable. Multi-omics analyses demonstrated that the electric field upregulated genes, proteins, and pathways related to energy metabolism, aromatic compound degradation, and oxidative stress responses, globally reshaping the metabolic network. The enhancement is attributed primarily to electric field-stimulated microbial metabolic activity rather than direct abiotic oxidation; elevated reactive oxygen species levels were associated with upregulation of key enzymes such as epoxide hydrolases, establishing a microbe-driven oxidative network that promoted the metabolic progression from initial ω‑oxidation toward deeper β‑oxidation pathways, ultimately driving more extensive polymer backbone cleavage. This study provides theoretical foundations and technical references for electric field-assisted biodegradation of plastic waste.