Journal
BIORESOURCE TECHNOLOGY
Volume 211, Issue -, Pages 685-690Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.03.138
Keywords
Short-chain fatty acids (SCFAs); Waste activated sludge (WAS); Alkaline fermentation; Mesotherm and microtherm; Microbial community; Enzyme activity
Funding
- Nature Science Foundation of China [51578014]
- Funding Projects of Beijing Municipal Commission of Education - China
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Sludge alkaline fermentation has been reported to achieve efficient short-chain fatty acids (SCFAs) production. Temperature played important role in further improved SCFAs production. Long-term SCFAs production from sludge alkaline fermentation was compared between mesotherm (30 +/- 2 degrees C) and microtherm (15 +/- 2 degrees C). The study of 90 days showed that mesotherm led to 2.2-folds production of SCFAs as microtherm and enhanced the production of acetic acid as major component of SCFAs. Soluble protein and carbohydrate at mesotherm was 2.63-folds as that at microtherm due to higher activities of protease and a-glucosidase, guaranteeing efficient substrates to produce SCFAs. Illumina MiSeq sequencing revealed that microtherm increased the abundance of Corynebacterium, Alkaliflexus, Pseudomonas and Guggenheimella, capable of enhancing hydrolysis. Hydrolytic bacteria, i.e. Alcaligenes, Anaerolinea and Ottowia, were enriched at mesotherm. Meanwhile, acidogenic bacteria showed higher abundance at mesotherm than microtherm. Therefore, enrichment of functional bacteria and higher microbial activities resulted in the improved SCFAs at mesotherm. (C) 2016 Elsevier Ltd. All rights reserved.
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