Self made electrode empowers electrochemical synergistic anaerobic fermentation treatment of pig manure

The intensive livestock production-derived fecal waste has emerged as a critical bottleneck in modern large scale farming. Conventional biological treatment modalities, including aerobic composting and anaerobic digestion systems, are proving increasingly inadequate to address the exponential growth in waste generation. Electrochemical enhanced fermentation technology has attracted much attention due to its ability to shorten the fermentation cycle. However, electrode corrosion has always been a key limiting factor for the promotion of electrochemical technology. To address this issue, this study employed lead-zinc tailings and waste graphite as raw materials, and prepares electrode materials through densification contact molding technology, explored the strengthening effect and heavy metals removal efficiency on the electrochemical enhanced fermentation system of pig manure. The experimental results shown that electrochemical enhancement of the fermentation cycle shortened the fermentation time by 7 days, the total gas production is increased by 12 %, and the methane production is increased by 2 % under the conditions of self-made electrodes. Meanwhile, It has a significant heavy metals removal effect, with a removal efficiency greater than 95 %, and no corrosion phenomenon of the electrode was found. This discovery compensated for the shortcomings of traditional electrochemical enhanced fermentation technology, improve the fermentation rate, shorten the fermentation time.