State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing, 100048, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
Environ Sci Pollut Res Int. 2024 Jun;31(27):39637-39649. doi: 10.1007/s11356-024-33525-1. Epub 2024 Jun 3.
The integrated system of anaerobic digestion and microbial electrolysis cells (AD-MEC) was a novel approach to enhance the degradation of food waste anaerobic digestate and recover methane. Through long-term operation, the start-up method, organic loading, and methane production mechanism of the digestate have been investigated. At an organic loading rate of 4000 mg/L, AD-MEC increased methane production by 3-4 times and soluble chemical oxygen demand (SCOD) removal by 20.3% compared with anaerobic digestion (AD). The abundance of bacteria Fastidiosipila and Geobacter, which participated in the acid degradation and direct electron transfer in the AD-MEC, increased dramatically compared to that in the AD. The dominant methanogenic archaea in the AD-MEC and AD were Methanobacterium (44.4-56.3%) and Methanocalculus (70.05%), respectively. Geobacter and Methanobacterium were dominant in the AD-MEC by direct electron transfer of organic matter into synthetic methane intermediates. AD-MEC showed a perfect SCOD removal efficiency of the digestate, while methane as clean energy was obtained. Therefore, AD-MEC was a promising technology for deep energy transformation from digestate.
厌氧消化和微生物电解池（AD-MEC）集成系统是一种增强食物垃圾厌氧消化物降解并回收甲烷的新方法。通过长期运行，研究了消化物的启动方法、有机负荷和甲烷产生机制。在有机负荷为 4000mg/L 时，与厌氧消化（AD）相比，AD-MEC 使甲烷产量增加了 3-4 倍，可溶性化学需氧量（SCOD）去除率提高了 20.3%。参与 AD-MEC 中酸降解和直接电子转移的细菌 Fastidiosipila 和 Geobacter 的丰度与 AD 相比显著增加。AD-MEC 和 AD 中主要的产甲烷古菌分别为 Methanobacterium（44.4-56.3%）和 Methanocalculus（70.05%）。通过有机物直接电子转移到合成甲烷中间体，AD-MEC 中 Geobacter 和 Methanobacterium 占优势。AD-MEC 对消化物具有完美的 SCOD 去除效率，同时获得了清洁的能源甲烷。因此，AD-MEC 是从消化物中进行深度能源转化的有前途的技术。
