Enhanced Acetogenesis of Waste Activated Sludge by Conditioning with Processed Organic Wastes in Co-Fermentation: Kinetics, Performance and Microbial Response

Yu Zhang, Rui Sun, Cristiano Varrone, Yaoli Wei, Alimzhanova Shyryn, Aijuan Zhou and Jie Zhang
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Yu Zhang: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
Rui Sun: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
Cristiano Varrone: Department of Chemistry and BioScience, Aalborg University, 9220 Copenhagen, Denmark
Yaoli Wei: College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Alimzhanova Shyryn: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
Aijuan Zhou: College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Jie Zhang: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China

Energies, 2020, vol. 13, issue 14, 1-14

Abstract: Aimed at the low ratio of carbon and nitrogen (C/N, approximately 7/1) of waste activated sludge (WAS), which would inhibit the acetogenesis process during anaerobic fermentation, this study introduced three brewing wastes, including vinegar (VR), stillage (SR) and soy sauce (SSR) residues, to promote acetogenesis by co-fermenting with WAS. Results showed that different brewing wastes contributed differently to the volatile fatty acids (VFAs) yield. The best performance was observed with SSR (4517 ± 367 mg COD/L), particularly rich in C 2 –C 3 VFAs, corresponding to 40% and 52% higher concentrations than with SR and VR, respectively. Meanwhile, the hydrolysis rate constant peaked at 0.0059 h −1 in the SSR test, compared to the sole WAS test (0.0018 h −1 ). Furthermore, canonical correlation analysis reflected that the functional consortia, known to ferment saccharides/amino acids into C 2 –C 3 VFAs (i.e., Proteiniclasticum, Petrimonas, Cloacibacillus and Gemmobacter ), was related to the characteristics of the feedstock.

Keywords: waste activated sludge (WAS); acetogenesis; processed organic wastes (PWs); resource recovery; key microbiomes (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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