School of Environment and Civil Engineering, Jiangnan University, Wuxi, Jiangsu Province 214122, PR China.
School of Environment and Civil Engineering, Jiangnan University, Wuxi, Jiangsu Province 214122, PR China; Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, Jiangsu Province 214122, PR China.
Bioresour Technol. 2020 Oct;313:123648. doi: 10.1016/j.biortech.2020.123648. Epub 2020 Jun 8.
High-solid anaerobic digestion (AD) faces the problems of easy acidification and low methane production efficiency. In this study, activated carbon (AC)-enhanced direct interspecies electron transfer (DIET) was investigated to overcome such problems. Results showed the conversion of volatile fatty acids (VFAs) into methane rate was increased with AC addition, which led improved methane production efficiency. The methane yields from the early AD stage improved by 124.0-146.3% with AC addition. The T shortened by 8-9 days with AC addition. The relative abundances of Geobacter, Syntrophomonas and Methanosaeta that associated with DIET improved for 63.65%, 256.3% and 4.35% by AC addition, which reflected the enhanced DIET with AC addition. The redox activity of AC might be responsible for the enhanced DIET. This study would advance the understanding of DIET and provide a potential solution to the problems existed in high-solid AD.
高固体厌氧消化（AD）面临易酸化和产甲烷效率低的问题。在本研究中，考察了活性炭（AC）增强的直接种间电子传递（DIET）以克服这些问题。结果表明，添加 AC 可提高挥发性脂肪酸（VFAs）转化为甲烷的速率，从而提高甲烷产率效率。添加 AC 可使 AD 早期阶段的甲烷产率提高 124.0-146.3%。T 缩短了 8-9 天。与 DIET 相关的 Geobacter、Syntrophomonas 和 Methanosaeta 的相对丰度分别提高了 63.65%、256.3%和 4.35%，这反映了 AC 增强了 DIET。AC 的氧化还原活性可能是增强 DIET 的原因。本研究将加深对 DIET 的理解，并为高固体 AD 中存在的问题提供潜在的解决方案。
