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Ultrasonically enhanced anaerobic digestion of thickened waste activated sludge using fluidized bed reactors

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  • Chowdhury, M.M.I.
  • Nakhla, G.
  • Zhu, J.

Abstract

This study aimed at assessing the impact of ultrasonication on the anaerobic digestibility of thickened waste activated sludge (TWAS) in an anaerobic fluidized bed reactor (AnFBR). Two lab-scale AnFBRs treating TWAS were studied to explore the impact of ultrasonication (US) in the dispersing and reuse of scum for methane production. Our current work applied ultrasound energy at 120–600kJ/d for 2s per 30s corresponding to ultrasonication densities of 6–15.7MJ/kg dry-scum-d. At an organic loading rate (OLR) of 5.1kg COD/m3-d and US energy of 11.9MJ/kg dry-scum-d, scum decreased by 82% from 20.2gm/d to 3.7gm/d, and COD and VSS destruction efficiencies were 65% and 63%, respectively roughly 20% higher than the control reactor without US. Scum reduction varied linearly with US energy about 25kJ/g TS was required to break the scum. The energy balance also indicated that the aforementioned US energy of 11.9MJ/kg dry-scum-d was optimum because of energy neutrality. Specific methanogenic activity (SMA) tests showed that the activity-based sludge retention time (SRT) is higher for the ultrasonicated AnFBR (U-AnFBR) (7.1days) compared to AnFBR (5.1days). Furthermore, a higher rate of maximum specific biogas production (Rm) was observed in the U-AnFBR of 26.7ml/gmVSS-hr as compared to 15.7ml/gmVSS-hr for the control AnFBR, with respective suspended biomass activities of 2ml/gmVSS-hr and 4.1ml/gmVSS-hr i.e. confirming that US improved methanogenic activity in the reactor and reduced the detachment of active methanogens.

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  • Chowdhury, M.M.I. & Nakhla, G. & Zhu, J., 2017. "Ultrasonically enhanced anaerobic digestion of thickened waste activated sludge using fluidized bed reactors," Applied Energy, Elsevier, vol. 204(C), pages 807-818.
    • Handle: RePEc:eee:appene:v:204:y:2017:i:c:p:807-818
    DOI: 10.1016/j.apenergy.2017.07.057
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    1. Lu Liu & Jun Zhang & Yifan Chen & Ze Guo & Ganzhan Xu & Linlin Yin & Yu Tian & Stevo Lavrnić, 2023. "Anaerobic Fluidized-Bed Membrane Bioreactor for Treatment of Liquid Fraction of Sludge Digestate: Performance and Agricultural Reuse Analysis," Sustainability, MDPI, vol. 15(9), pages 1-17, May.
    2. Du, Jiliang & Chen, Le & Li, Jianan & Zuo, Ranan & Yang, Xiushan & Chen, Hongzhang & Zhuang, Xinshu & Tian, Shen, 2018. "High-solids ethanol fermentation with single-stage methane anaerobic digestion for maximizing bioenergy conversion from a C4 grass (Pennisetum purpereum)," Applied Energy, Elsevier, vol. 215(C), pages 437-443.
    3. Çelebi, Emrehan Berkay & Aksoy, Ayşegül & Sanin, F. Dilek, 2021. "Maximizing the energy potential of urban sludge treatment: An experimental study and a scenario-based energy analysis focusing on anaerobic digestion with ultrasound pretreatment and sludge combustion," Energy, Elsevier, vol. 221(C).

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