Effects of liquid fraction of digestate recirculation on system performance and microbial community structure during serial anaerobic digestion of completely stirred tank reactors for corn stover

YuQian Li, ChunMei Liu, Akiber Chufo Wachemo and XiuJin Li

Energy, 2018, vol. 160, issue C, 309-317

Abstract: Several completely stirred tank reactors (CSTRs) connected in series for corn stover anaerobic digestion was devised to obtain more methane yield and increase conversion rates. Liquid fraction of the digestate (LFD) was recirculated from the second-stage reactor to first-stage reactors to reuse LFD and improve system performance. LFD recirculation didn’t inhibit methane production of serial digestion, and methane and biogas production were increased by 2.3% and 10.8%, respectively. Moreover, LFD recirculation increased pH and alkalinity concentration (AC) and decreased volatile fatty acids (VFAs) concentrations and the ratio of VFAs to AC, which means a significant increase in system stability of anaerobic digestion (AD). Ammonia concentrations gradually increased with LFD recirculation, but was far lower than the inhibition concentration. Microbial analysis indicated that the recirculation increased the richness, but decreased the diversity of both bacterial and archaeal community in the first and second stage of serial system. More specifically, LFD recirculation enriched the dominant bacterial phyla (Bacteroidetes and Firmicutes), but had little influence on the dominated archaeal genus (Methanobacterium). The results showed that the recirculation of LFD during serial AD was technically suitable by minimizing both discharge of LFD and possible pollution related with discharging LFD.

Keywords: Corn stover; LFD recirculation; Serial anaerobic digestion; Methane production; System stability; Microbial community structure (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544218311472
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:160:y:2018:i:c:p:309-317

DOI: 10.1016/j.energy.2018.06.082

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().