School of Energy and Environment, Key Laboratory of Clean Energy (Liaoning Province), Shenyang Aerospace University, No. 37 Daoyi South Avenue, Shenyang 110136, PR China.
School of Energy and Environment, Key Laboratory of Clean Energy (Liaoning Province), Shenyang Aerospace University, No. 37 Daoyi South Avenue, Shenyang 110136, PR China.
Bioresour Technol. 2019 Mar;275:172-182. doi: 10.1016/j.biortech.2018.12.052. Epub 2018 Dec 17.
This study investigated mechanism of process imbalance of long-term anaerobic digestion (AD) of food waste (FW) and role of trace elements (TEs) in maintaining process stability. AD of FW was strongly inhibited by volatile fatty acids (VFA, mainly propionate). The deficiency of essential TEs in FW was the fundamental reason. TEs contents in digester gradually decreased with regular substrate feeding and digestate discharge, which greatly limited growth and metabolism of hydrogenotrophic methanogens and Methanosarcina. Finally, Methanosaeta replaced Methanosarcina and became dominant methanogen and hydrogenotrophic methanogens almost disappeared accompanied by declining methanogenic community diversity, which greatly suppressed ecological functions of methanogens and led to propionate inhibition. TEs supplementation eliminated all factors causing process imbalance and significantly enhanced process stability by maintaining strong ecological functions of methanogens via stimulating dominant growth of Methanosarcina (relative abundance between 67.2% and 87.5%), sustaining stable relative abundances of hydrogenotrophic methanogens (about 10%) and enhancing methanogenic community diversity.
本研究调查了食品废物（FW）长期厌氧消化（AD）过程失衡的机制以及微量元素（TEs）在维持过程稳定性中的作用。挥发性脂肪酸（VFA，主要是丙酸）强烈抑制 FW 的 AD。FW 中必需 TEs 的缺乏是根本原因。随着底物的定期进料和消化液的排出，消化器中的 TEs 含量逐渐减少，这极大地限制了产氢甲烷菌和 Methanosarcina 的生长和代谢。最终，Methanosaeta 取代 Methanosarcina 成为优势产甲烷菌，产氢甲烷菌几乎消失，伴随着甲烷菌群落多样性的下降，这极大地抑制了甲烷菌的生态功能，导致丙酸抑制。TEs 补充消除了导致过程失衡的所有因素，并通过刺激 Methanosarcina 的优势生长（相对丰度在 67.2%至 87.5%之间），维持稳定的产氢甲烷菌相对丰度（约 10%）和增强甲烷菌群落多样性，显著增强了过程稳定性。
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