State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Key Laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, College of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing 400045, China.
Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
Bioresour Technol. 2024 Jun;402:130775. doi: 10.1016/j.biortech.2024.130775. Epub 2024 May 1.
Acidification recovery in anaerobic digestion of food waste is challenging. This study explored its in-situ recovery using a co-substrate of food waste and waste activated sludge. FeO and bentonite were used as conductor and carrier, respectively, to enhance AD performance under severe acidification. The application of FeO-bentonite resulted in a 152% increase in cumulative methane in the FeO-bentonite 10 digester, demonstrating its effectiveness in restoring the acidified AD system. In acidified systems, bentonite enhanced the diversity and richness of microbial communities due to its buffering capacity. The excessive non-conductive polysaccharides excreted by bacteria in extracellular polymeric substances reduced the possibility of electron transfer by FeO. However, in the synergistic application of FeO and bentonite, this resistance was alleviated, increasing the possibility of direct interspecies electron transfer, and accelerating the consumption of volatile fatty acids. This approach of integrating carrier and conductive materials is significant for in-situ restoration of acidified systems.
在食物垃圾的厌氧消化中，酸化解吸是一个具有挑战性的问题。本研究探索了原位恢复的方法，即将食物垃圾和废活性污泥作为共基质加以利用。FeO 和膨润土分别作为导体和载体，以增强在严重酸化条件下的 AD 性能。FeO-膨润土的应用使 FeO-膨润土 10 消化器中的累积甲烷增加了 152%，证明了其在恢复酸化 AD 系统方面的有效性。在酸化系统中，膨润土由于其缓冲能力提高了微生物群落的多样性和丰富度。细菌在细胞外聚合物中分泌的过多非传导性多糖降低了 FeO 电子转移的可能性。然而，在 FeO 和膨润土的协同应用中，这种阻力得到缓解，增加了直接种间电子转移的可能性，并加速了挥发性脂肪酸的消耗。这种将载体和导电材料相结合的方法对于酸化系统的原位恢复具有重要意义。
