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Inhibitory effect of oil and fat on denitrification using food waste fermentation liquid as carbon source.

Authors
  • Chen, Xihong1
  • Tang, Rui1
  • Qi, Shasha1
  • A, Rong1
  • Ali, Ibrahim Mohamed2
  • Luo, Haiping3
  • Wang, Wei4
  • Hu, Zhen-Hu5
  • 1 School of Civil Engineering, Hefei University of Technology, Hefei 230009, China. , (China)
  • 2 Department of Soil and Water, Faculty of Agriculture, Benha University, Egypt. , (Egypt)
  • 3 Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China. , (China)
  • 4 School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei 230024, China. , (China)
  • 5 School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei University of Technology, Hefei 230009, China. Electronic address: [email protected] , (China)
Type
Published Article
Journal
The Science of the total environment
Publication Date
Nov 25, 2021
Volume
797
Pages
149111–149111
Identifiers
DOI: 10.1016/j.scitotenv.2021.149111
PMID: 34303253
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Food waste fermentation liquid (FWFL) can be used as carbon source to enhance nitrogen removal in wastewater treatment. However, the influence of lipid, a common component of food waste, on denitrification remains unclear. In this study, the effect of oil and fat on denitrification process and the underlying mechanisms were investigated using synthetic oil- and fat-bearing carbon source and verified with real FWFL. In the batch experiment, oil and fat had no obvious influence on denitrification, but in the semi-continuous experiment, the denitrification rate in the oil- and fat-added assays decreased to 44% and 38% of that in the control, respectively, after 45 batches. Oil and fat caused sludge floatation, and the floating sludge thickness increased with the continuous operation. Oil/fat-sludge aggregates were observed in the floating sludge and limited gas release. Microbial community analysis indicated that oil and fat did not affect denitrifying bacteria abundance. Limitation of mass transfer might be the main reason for the inhibition of oil and fat on denitrification. In the real FWFL experiment, the denitrification rate in the original and emulsified oil-bearing FWFL decreased to 24% and 56% of that in the demulsifying FWFL, respectively, after 45 batches. These findings indicate the necessity of removing lipids when FWFL is used as denitrification carbon source. Copyright © 2021 Elsevier B.V. All rights reserved.

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