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Effect of deflocculation on the efficiency of low-energy microwave pretreatment and anaerobic biodegradation of waste activated sludge

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  • Ebenezer, A. Vimala
  • Arulazhagan, P.
  • Adish Kumar, S.
  • Yeom, Ick-Tae
  • Rajesh Banu, J.

Abstract

This study focuses on improving the efficiency of the microwave (MW) pretreatment of waste activated sludge (WAS) through deflocculation mediated by sodium tripolyphosphate (STPP), a cationic binding agent. Deflocculated sludge was subjected to MW pretreatment to assess its impact on biomass disintegration. At the optimised energy for MW pretreatment (14,000kJ/kg TS), the chemical oxygen demand (COD) solubilisation was 28% and 21% and the reduction in suspended solids (SS) was 38% and 26%, respectively, for deflocculated (treated with a cationic binding agent followed by microwaves) and flocculated (treated by microwaves alone) sludge samples. The formation of volatile fatty acids in the deflocculated sludge medium (840mg/L) was comparatively higher than that in the flocculated sludge (420mg/L) and the control (62mg/L). This study indicates that deflocculated sludge is more amenable to hydrolysis. The results of a test of biochemical methane potential also confirmed the greater amenability of deflocculated sludge for anaerobic degradation.

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  • Ebenezer, A. Vimala & Arulazhagan, P. & Adish Kumar, S. & Yeom, Ick-Tae & Rajesh Banu, J., 2015. "Effect of deflocculation on the efficiency of low-energy microwave pretreatment and anaerobic biodegradation of waste activated sludge," Applied Energy, Elsevier, vol. 145(C), pages 104-110.
    • Handle: RePEc:eee:appene:v:145:y:2015:i:c:p:104-110
    DOI: 10.1016/j.apenergy.2015.01.133
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    References listed on IDEAS

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    Cited by:

    1. Wang, Jie & Li, Yongmei, 2016. "Synergistic pretreatment of waste activated sludge using CaO2 in combination with microwave irradiation to enhance methane production during anaerobic digestion," Applied Energy, Elsevier, vol. 183(C), pages 1123-1132.
    2. Zhen, Guangyin & Lu, Xueqin & Kato, Hiroyuki & Zhao, Youcai & Li, Yu-You, 2017. "Overview of pretreatment strategies for enhancing sewage sludge disintegration and subsequent anaerobic digestion: Current advances, full-scale application and future perspectives," Renewable and Sustainable Energy Reviews, Elsevier, vol. 69(C), pages 559-577.
    3. Yin, Yao & Liu, Ya-Juan & Meng, Shu-Juan & Kiran, Esra Uçkun & Liu, Yu, 2016. "Enzymatic pretreatment of activated sludge, food waste and their mixture for enhanced bioenergy recovery and waste volume reduction via anaerobic digestion," Applied Energy, Elsevier, vol. 179(C), pages 1131-1137.
    4. Li, Yue & Chen, Yinguang & Wu, Jiang, 2019. "Enhancement of methane production in anaerobic digestion process: A review," Applied Energy, Elsevier, vol. 240(C), pages 120-137.
    5. Cano, R. & Pérez-Elvira, S.I. & Fdz-Polanco, F., 2015. "Energy feasibility study of sludge pretreatments: A review," Applied Energy, Elsevier, vol. 149(C), pages 176-185.
    6. Awasthi, Mukesh Kumar & Singh, Ekta & Binod, Parameswaran & Sindhu, Raveendran & Sarsaiya, Surendra & Kumar, Aman & Chen, Hongyu & Duan, Yumin & Pandey, Ashok & Kumar, Sunil & Taherzadeh, Mohammad J. , 2022. "Biotechnological strategies for bio-transforming biosolid into resources toward circular bio-economy: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 156(C).
    7. Jumoke Oladejo & Kaiqi Shi & Xiang Luo & Gang Yang & Tao Wu, 2018. "A Review of Sludge-to-Energy Recovery Methods," Energies, MDPI, vol. 12(1), pages 1-38, December.
    8. Stanisław Wacławek & Klaudiusz Grübel & Daniele Silvestri & Vinod V. T. Padil & Maria Wacławek & Miroslav Černík & Rajender S. Varma, 2018. "Disintegration of Wastewater Activated Sludge (WAS) for Improved Biogas Production," Energies, MDPI, vol. 12(1), pages 1-15, December.

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