Journal
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Volume 94, Issue 10, Pages 3201-3207Publisher
WILEY
DOI: 10.1002/jctb.6127
Keywords
nanoscale zerovalent iron (NZVI); volatile fatty acids (VFAs); ferredoxin oxidoreductase (FDXR); acetyl CoA (A-CoA); food waste
Categories
Funding
- International Science & Technology Cooperation Program of China [2013DFG92600]
- National Scientific Funding of China [51378003]
- Fundamental Research Funds for the Central Universities [FRF-BD-17-014A]
- Sino-US-Japan Joint Laboratory on Organic Solid Waste Resource and Energy Technology of USTB
Ask authors/readers for more resources
BACKGROUND The proper dosage of nanoscale zerovalent iron (NZVI) for volatile fatty acid (VFA) production was optimized and different kinds of organic acids and key enzymes during the process were analyzed to test the effect of NZVI on VFA fermentation from food waste. RESULTS Batch assays showed that proper NZVI dosage can promote VFA production, reaching the maximum accumulation of 22 250 mg COD L-1 at 10 g L-1 dosage, which is 1.92 times higher than that of the control group. Acetic acid accounted for the highest proportion (72%) of VFAs, and lactic acid was the main by-product of organic acids. The addition of NZVI provided a reducing power for the lactic acid fermentation in the system, which promoted the conversion of pyruvic acid to lactic acid. Moreover, the addition of NZVI not only greatly promoted the activity of ferredoxin oxidoreductase (0.35 IU g(-1)) and acetyl-CoA (1.47 IU g(-1)) but also caused changes in the microbial community structure in the fermentation system. After adding NZVI, besides Lactobacillus, Olsenella (12.69%) was another dominant bacterium which can rapidly convert the produced lactic acid into short-chain fatty acids (SCFAs), thereby affecting acid production. CONCLUSION These key enzymes resulted in the accumulation of VFAs. The fermentative bacteria responsible for SCFA production were also highly enriched in fermentation reactors with NZVI, which was in accordance with the accumulation of SCFAs. (c) 2019 Society of Chemical Industry
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available