Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China; Department of Frontier Science for Advanced Environment, Graduate School of Environmental Sciences, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi, 980-8579, Japan.
Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China.
Bioresour Technol. 2024 Sep;408:131223. doi: 10.1016/j.biortech.2024.131223. Epub 2024 Aug 5.
This study investigated the effects of varying lipid ratios on the anaerobic co-digestion of high-lipid food waste (FW) in a mesophilic anaerobic membrane bioreactor (AnMBR). At a lipid concentration of 5 %, optimal biogas production (3.84 L/L/d) and lipid removal efficiency (78 %) were achieved; however, increasing lipid concentrations resulted in significant accumulations of long-chain fatty acids (LCFAs) and volatile fatty acids (VFAs). Batch tests further demonstrated the impact of various types of LCFAs, with stearic acid showing the slowest microbial growth rate (0.033d), confirming its role in the accumulation of acetate-dominated VFAs, potentially limiting the methanogenesis process at elevated lipid levels. Furthermore, at 8 % lipid content, the downregulation of key LCFA degradation enzymes and dominance of hydrogenotrophic methanogens indicated adverse conditions. The importance of the intricate interplay between LCFA degradation kinetics and microbial community for the system efficiency was evidenced, offering insights for optimizing and managing high-lipidic wastes.
本研究考察了不同油脂比例对中温厌氧膜生物反应器（AnMBR）中高脂食物废物（FW）厌氧共消化的影响。在 5%的油脂浓度下，实现了最佳的沼气产量（3.84 L/L/d）和油脂去除效率（78%）；然而，随着油脂浓度的增加，长链脂肪酸（LCFAs）和挥发性脂肪酸（VFAs）的积累显著增加。批处理实验进一步证明了不同类型的 LCFAs 的影响，硬脂酸表现出最慢的微生物生长速率（0.033d），证实其在以乙酸为主的 VFAs 积累中的作用，可能限制了在高油脂水平下的产甲烷过程。此外，在 8%的油脂含量下，关键的 LCFA 降解酶的下调和产氢甲烷菌的优势表明存在不利条件。这表明 LCFA 降解动力学和微生物群落之间的复杂相互作用对系统效率的重要性，为优化和管理高油脂废物提供了思路。
