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

Author

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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
    State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China)

  • Jie Zhang

    (State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China)

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.

Suggested Citation

  • Yu Zhang & Rui Sun & Cristiano Varrone & Yaoli Wei & Alimzhanova Shyryn & Aijuan Zhou & Jie Zhang, 2020. "Enhanced Acetogenesis of Waste Activated Sludge by Conditioning with Processed Organic Wastes in Co-Fermentation: Kinetics, Performance and Microbial Response," Energies, MDPI, vol. 13(14), pages 1-14, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:14:p:3630-:d:384364
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    References listed on IDEAS

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    1. Koch, Konrad & Helmreich, Brigitte & Drewes, Jörg E., 2015. "Co-digestion of food waste in municipal wastewater treatment plants: Effect of different mixtures on methane yield and hydrolysis rate constant," Applied Energy, Elsevier, vol. 137(C), pages 250-255.
    2. Zhang, Jingxin & Li, Wangliang & Lee, Jonathan & Loh, Kai-Chee & Dai, Yanjun & Tong, Yen Wah, 2017. "Enhancement of biogas production in anaerobic co-digestion of food waste and waste activated sludge by biological co-pretreatment," Energy, Elsevier, vol. 137(C), pages 479-486.
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