Department of Environmental Engineering, University of Science and Technology, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China; Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China.
Department of Environmental Engineering, University of Science and Technology, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China.
J Hazard Mater. 2021 Sep 5;417:126037. doi: 10.1016/j.jhazmat.2021.126037. Epub 2021 May 5.
Chinese liquor distillers' grain (CLDG) is an abundant industrial organic waste showing high potential as feedstock for biofuel conversion. In this study, CLDG was used as substrate by microbial community in pit mud to produce medium-chain fatty acids (especially caproate). Simulated and real fermentation were used to evaluate the effect of ethanol and lactic acid being the electronic donors (EDs) during the anaerobic chain elongation (CE). The caproate concentration was achieved at 449 mg COD/g VS, with the corresponding high carbon selectivity at 37.1%. Microbial analysis revealed that the domestication of pit mud increased the abundance of Caproiciproducens (converting lactic acid into caproate) and Lactobacillus (producing lactic acid), leading to enhanced caproate production. The lactic acid conversion facilitated in full utilization of ethanol through CE consumption. The coexistence of EDs benefited the CE system and that this green energy production can be a promising high-performance biofuel donor for sustainable industrial production development.
白酒糟（CLDG）是一种丰富的工业有机废物，具有作为生物燃料转化原料的巨大潜力。在本研究中，CLDG 被窖泥微生物群落用作基质来生产中链脂肪酸（特别是己酸）。通过模拟和实际发酵来评估乙醇和乳酸作为电子供体（EDs）在厌氧链伸长（CE）过程中的效果。己酸的浓度达到 449mg COD/g VS，对应的碳选择性高达 37.1%。微生物分析表明，窖泥驯化增加了产己酸的 Caproiciproducens（将乳酸转化为己酸）和产乳酸的 Lactobacillus（产生乳酸）的丰度，从而提高了己酸的产量。乳酸的转化有利于通过 CE 消耗充分利用乙醇。EDs 的共存有利于 CE 系统，这种绿色能源的生产可以成为一种有前途的高性能生物燃料供体，以促进可持续的工业生产发展。
