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Effects of Two-Stage Operation on Stability and Efficiency in Co-Digestion of Food Waste and Waste Activated Sludge

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  • Xinyuan Liu

    (School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
    College of Engineering and Technology, Tianjin Agricultural University, Tianjin 300384, China)

  • Ruying Li

    (School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China)

  • Min Ji

    (School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China)

Abstract

The two-stage anaerobic digestion (AD) technology attracts increasing attention due to its ability to collect both hydrogen and methane. A two-stage AD system feeding with food waste and waste activated sludge was investigated in order to achieve higher energy yield and organics removal. The two-stage process consists of a thermophilic H 2 -reactor and a mesophilic CH 4 -reactor, achieved the highest hydrogen and methane yields of 76.8 mL/g-VS and 147.6 mL/g-VS at hydraulic retention times (HRTs) of 0.8 d and 6 d, respectively. The co-digestion process in this study required much less external alkalinity to maintain the pH values than sole food waste digestion in the literature. Compared with the single-stage mesophilic methane AD process, the two-stage AD system had better performance on operation stability, biogas and energy yields, organics removal and chemical oxygen demand (COD) conversion at high organic loading rates (OLRs). According to the TA-cloning analysis, the dominant bacteria in H 2 -reactor was closely related to Clostridium sp. strain Z6 and species Thermoanaerobacterium thermosaccharolyticum . The dominant methanogens in two-stage and single-stage CH 4 -reactor were recognized as acetotrophic methanogens and hydrogenotrophic methanogens, respectively. The presence of the genus Nitrososphaera in the two CH 4 -reactors might contribute to the low NH 4 + -N concentration in digestate and low CO 2 content in biogas.

Suggested Citation

  • Xinyuan Liu & Ruying Li & Min Ji, 2019. "Effects of Two-Stage Operation on Stability and Efficiency in Co-Digestion of Food Waste and Waste Activated Sludge," Energies, MDPI, vol. 12(14), pages 1-21, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:14:p:2748-:d:249430
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    References listed on IDEAS

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    1. Baldi, F. & Pecorini, I. & Iannelli, R., 2019. "Comparison of single-stage and two-stage anaerobic co-digestion of food waste and activated sludge for hydrogen and methane production," Renewable Energy, Elsevier, vol. 143(C), pages 1755-1765.
    2. Algapani, Dalal E. & Qiao, Wei & Ricci, Marina & Bianchi, Davide & M. Wandera, Simon & Adani, Fabrizio & Dong, Renjie, 2019. "Bio-hydrogen and bio-methane production from food waste in a two-stage anaerobic digestion process with digestate recirculation," Renewable Energy, Elsevier, vol. 130(C), pages 1108-1115.
    3. Claudinei De Souza Guimarães & David Rodrigues da Silva Maia & Eduardo Gonçalves Serra, 2018. "Construction of Biodigesters to Optimize the Production of Biogas from Anaerobic Co-Digestion of Food Waste and Sewage," Energies, MDPI, vol. 11(4), pages 1-10, April.
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    Cited by:

    1. Theresa Menzel & Peter Neubauer & Stefan Junne, 2020. "Role of Microbial Hydrolysis in Anaerobic Digestion," Energies, MDPI, vol. 13(21), pages 1-29, October.

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