Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 10, Issue 1, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106935
Keywords
Anaerobic digestion; Food waste; Acidification; Butyric acid; Bioaugmentation; Restoration
Categories
Funding
- National Key Research and Development Project of China [2019YFC1906303]
- National Natural ScienceFoundation of China [42007350]
- Beijing Municipal Natural Science Foundation [8202010]
- Research Foundation for Youth Scholars of Beijing Technology and Business University [QNJJ2021-31]
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This study effectively restored an unstable acidified anaerobic digestion system by bioaugmenting with butyric-resistant microorganisms, leading to a decrease in butyrate concentration, an increase in methane production, and the maintenance of interspecies electron transfer relationships among microorganisms.
Acidification is a key technical problem in the dry anaerobic digestion system. The effect of bioaugmentation of butyric-resistant microorganisms (BRM) on an unstable acidified anaerobic digestion (AD) system was studied in this work. BRM were enriched in an AD system fed with butyric acid for 36 days. The slurry containing BRM was collected from the fermenter peak on the 24th day when methane production reached the peak, and transferred to an acidified fermenter fed with food waste. After the bioaugmentation, the acidified system was restored obviously. The concentration of butyrate decreased from 16.57 g/L to 5.06 g/L in the acidified system and the methane production increased by 52.2 mL/g-VS in the bioaugmentation treatment, compared to the fermenter without bioaugmentation. Syntrophomonas (Firmicutes) and Proteiniphilum (Bacteroidetes) were enriched in BRM, which contributed to maintain the interspecies electron transfer relationship with Methanosaeta. Therefore, bioaugmentation of BRM restored the integrity of microorganisms in AD and relieved pressure of VFA accumulation. This study provided an experimental and theoretical foundation for the management of acidification in dry AD of food waste.
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