[P004] Poster

1:00 PM - 1:50 PM JST(4:00 AM - 4:50 AM UTC)

[P02-254] Black soldier fly byproduct-derived N-doped biochar enables efficient electron transfer and synergistic remediation in sediment bioelectro-Fenton systems

○Chi-Wen Lin¹, Yi-Kai Yang¹, Shu-Hui Liu¹ (1. National Yunlin University of Science and Technology (Taiwan))

Keywords:

Insect waste valorization,Nitrogen-enriched biochar,Sediment remediation,Reactive oxygen species,Coupled pollutant removal

Sediment co-contamination by heavy metals and persistent organic pollutants remains difficult to remediate because pollutant transport, redox behavior, and toxicity evolution are closely coupled. In this study, black soldier fly (BSF) shell and frass wastes were co-valorized to prepare a nitrogen-enriched biochar anode for a sediment bioelectro-Fenton (BEF) system, aiming at simultaneous Cu ions migration and bisphenol A (BPA) degradation. Using a hydrothermal coupling strategy followed by pyrolysis, the optimized anode NBC1000 was obtained, showing a high surface area (234.5 m²/g), improved hydrophilicity, enriched graphitic/pyrrolic nitrogen groups, and enhanced electrochemical activity.When applied in the sediment BEF reactor, NBC1000 exhibited the lowest charge-transfer resistance and the strongest electrical response, indicating improved extracellular electron transfer and biofilm compatibility. As a result, the system achieved 65.7% Cu ions migration, 35.9% Cu recovery, 95.9% sediment organic carbon mineralization, and 99.35% BPA removal within 23 days. Enhanced electron supply also promoted Fe/Cu redox cycling and reactive oxygen species production, with hydroxyl radical identified as the dominant oxidizing species by quenching and EPR analyses. In addition, residual toxicity was markedly reduced, with corrected toxicity approaching the blank level after 46 days. Overall, this study presents a circular and effective strategy for converting insect-derived waste into functional bioelectrochemical materials for coupled heavy metal and organic pollutant remediation in sediments.