Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 27, Issue 14, Pages 16254-16267Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-08013-x
Keywords
Biomethane; Microecosystem; VFA inhibition; Synergistic effect; Humic acid; Electron transfer
Categories
Funding
- National Natural Science Foundation of China [51608304, U1806216]
- Young Scholars Program of Shandong University
- Research Fund of Tianjin Key Laboratory of Aquatic Science and Technology [TJKLAST-ZD-2017-04]
- Research Fund of Jiangsu Key Laboratory of Anaerobic Biotechnology [JKLAB201702]
- Fundamental Research Funds of Shandong University
- China Postdoctoral Science Foundation [2017M622209, 2019T120599]
Ask authors/readers for more resources
With the invasion of green tide, there were millions of tons of Enteromorpha prolifera (Enteromorpha) that need to be disposed of. An efficient microecological system for Enteromorpha fermentation was constructed using Saccharomyces cerevisiae (S. cerevisiae) and granular sludge at mesophilic condition (35 degrees C). In order to investigate the influence of S. cerevisiae dosage on fermentation, biomethane production and variations in dissolved organic matter (DOM) were investigated. The results indicated that the microecosystem with added S. cerevisiae exhibited improved fermentation capacity. Specifically, biomethane production was improved by 18%, with a maximum methane yield of 331 mL/g VS, and the time required to reach 90% methane yield was reduced by 41%. There were positive linear relationships between S. cerevisiae dosage and the efficiency of hydrolysis, acidogenesis, acetogenesis, and methanogenesis (R-2 > 0.9). According to theoretical calculations, there was a positive effect of lower S. cerevisiae dosage (less than 0.93 g/g TS) on biomethane production, and excess dosage (more than 0.93 g/g TS) led to a negative effect due to volatile fatty acid (VFA) accumulation. The excitation-emission matrix (EEM) indicated that the humification index (HIX) and fulvic acid (FA) percentage of fluorescence regional integration in the system were decreased because the quinone and ketone groups of the FA accepted electrons from S. cerevisiae. These findings suggested that this microecosystem can accelerate fermentation speed (41%) and increase biomethane output (18.2%).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available