Electric field as a priming trigger reshaping redox network for synergistic perfluorooctanoic acid degradation and humus synthesis during aerobic composting.
AI summary
75% confidenceThis MEC study investigates Aerobic composting, Electric field intensity, Humus. The research focuses on system optimization and characterization.
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Abstract
Electric field intensity-driven aerobic composting is an effective method for recovering organic solid waste resources and degrading refractory perfluorooctanoic acid (PFOA). Although electric fields alter the compost microenvironment to overcome natural composting limitations, the mechanism underlying cathode-anode differentiation regulation of microbial metabolic networks to synergistically drive PFOA degradation and humus formation remains unclear. In this study, aerobic composting systems operating at 0, 5, and 10 V were established. High-throughput sequencing and electrochemical analyses were used to test the hypothesis that an exogenous electric field induces spatial redox microenvironment differentiation, guides microbial functional divergence, and enhances synergistic humus synthesis and pollutant removal. The reductive microenvironment of the cathode favored humus synthesis-related genera, facilitating humus accumulation and stabilization through the shikimic acid metabolic pathway. The 10 V treatment significantly increased the humus accumulation (55.61 %) compared with the control. The oxidative microenvironment of the anode specifically enriched denitrifying genera, which facilitated PFOA degradation using highly active intermediates. The anode region under 10 V treatment exhibited the optimal pollutant removal efficiency and a high PFOA removal rate of approximately 98.55 %. In addition, the electric field enhanced microbial synergy, shifted communities from competition to cooperation, and finally formed a "cathode synthesis-anode degradation" synergistic network. This study elucidates the role of "redox microenvironmental differentiation" in regulating microbial community functions in electric field-driven aerobic composting and provides a novel strategy for developing synergistic technologies for organic waste recycling and refractory pollutant removal.