Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 776, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.145598
Keywords
Anaerobic co-digestion; Microbial community; Methane; Waste activated sludge; Food waste; Allicin
Categories
Funding
- project of the National Key Research and Development Program of China [2018YFC1800400]
- National Natural Science Foundation of China (NSFC) [51779088, 51779089, 51478170]
- Natural Science Foundation of Hunan Province [2020JJ6005]
- Huxiang High Level Talent Gathering Project [2019RS1029]
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Allicin, an active component in garlic species, is found to inhibit anaerobic co-digestion, leading to minimal methane accumulation in the system. However, the release of intracellular material and increase in microbial diversity were observed in the presence of allicin.
Allicin as an active component in allium species being widely present in food waste (FW) and waste activated sludge (WAS). Recently, allicin has been found to inhibit the anaerobic co-digestion. However, few literatures were available related to its impacting on organic matter release and microbial community in anaerobic co digestion system of FW and WAS. Thus, this work aimed to fill that gap through use a series of batch test under conditions of pH 7 and 35 +/- 1 degrees C. Experimental results showed that the anaerobic co-digestion system almost could not measure methane accumulation before day 20, when allicin dosage was 2.0 mu g/L. However, the amount of intracellular material released from FW and WAS to substrate liquid was raised, including organic matter, PO43--P and NH4+-N. Analysis of microbial community based on high throughput sequencing showed that microbial diversity increased at initial phase of anaerobic co-digestion from FW and WAS, meanwhile, community abundance of Candidatus_Methanofastidiosum raised significantly with co-digestion time. Whereas, methanosaeta abundance was only 19.74% in the allicin test reactor that it was the highest abundance in blank group. (C) 2021 Elsevier B.V. All rights reserved.
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