Journal
BIORESOURCE TECHNOLOGY
Volume 274, Issue -, Pages 97-104Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.11.072
Keywords
Solid-liquid separation; VFA production; US-Ca(OH)(2) pretreatment; Kinetic model; Microbial community composition
Funding
- Fundamental Research Funds for the Central Universities [2017CGP017]
- National Natural Science Foundation of China [51578068]
- ShenZhen Techand Ecology & Environment CO. LTD [THRD005]
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Ultrasound-calcium hydroxide (US-Ca(OH)(2)) pretreatment effectively enhanced volatile fatty acid (VFA) production from lignocellulosic biomass. In this paper, solid and liquid fraction of pretreated grass clipping was for the first time separately fermented in order to improve organic recovery from liquid fraction and reduce inhibition due to alkaline pretreatment. The total VFA yield and VS removal reached 515 mg/g TS and 59.7% after solid-liquid separation, exhibiting an increase of 116.7% and 91.9% comparing to that of mixture sample. The dominate components of VFAs are acetic and propionate acid, accounting for 80-90% of total VFAs. Kinetic analysis showed that the highest maximum VFA production rate of 690 mg/L.d and the highest cumulative VFA production potential of 3299 mg/L were achieved in the fermentation of solid fraction. Microbial analysis showed that the dominate genera for VFA production were Halocella and Ruminiclostridium, both with a relative abundance of 20.1% in fermentation of solid fraction.
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