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Influences of low-energy input microwave and ultrasonic pretreatments on single-stage and temperature-phased anaerobic digestion (TPAD) of municipal wastewater sludge

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  • Akgul, Deniz
  • Cella, Monica Angela
  • Eskicioglu, Cigdem

Abstract

The effect of low energy-input (2.5 kJ/g total solids) microwave (MW) irradiation and ultrasonication (US) on single-stage mesophilic anaerobic digestion (AD) and temperature-phased AD (TPAD) treating wastewater sludge was assessed. The goal was to achieve a higher net energy along with improved digestate for agricultural applications. At sludge retention times (SRT) of 20 and 14 days, TPAD achieved significantly (39–45%) higher methane production, pathogen destruction (4-log) and digester volume reductions compared to single-stage AD (controls). The higher methane yields resulted in higher net energies for TPAD (4.7–5.1 kJ/g volatile solids or VS) compared to controls (3.3–3.7 kJ/g VS). Although improvements in organic removals and methane yields were observed after MW and US, the energy input for pretreatments were not compensated by the increased methane production, and therefore were concluded to be infeasible for industrial applications for single-stage and TPAD. All TPADs provided the highest pathogenic removal, and met the Class A biosolids fecal coliform requirements, while MW pretreatment achieved the highest fecal coliform removal for single-stage AD with digestates classified as Class B. Digesters incorporating thermal pretreatment (MW and MW + TPAD) yielded the highest amount of extra heat (4.2–5.8 kJ/g VS) that could be utilized within/outside of the facility.

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  • Akgul, Deniz & Cella, Monica Angela & Eskicioglu, Cigdem, 2017. "Influences of low-energy input microwave and ultrasonic pretreatments on single-stage and temperature-phased anaerobic digestion (TPAD) of municipal wastewater sludge," Energy, Elsevier, vol. 123(C), pages 271-282.
    • Handle: RePEc:eee:energy:v:123:y:2017:i:c:p:271-282
    DOI: 10.1016/j.energy.2017.01.152
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    3. Luz, Fábio Codignole & Cordiner, Stefano & Manni, Alessandro & Mulone, Vincenzo & Rocco, Vittorio & Braglia, Roberto & Canini, Antonella, 2018. "Ampelodesmos mauritanicus pyrolysis biochar in anaerobic digestion process: Evaluation of the biogas yield," Energy, Elsevier, vol. 161(C), pages 663-669.
    4. Hosseini Koupaie, E. & Lin, L. & Bazyar Lakeh, A.A. & Azizi, A. & Dhar, B.R. & Hafez, H. & Elbeshbishy, E., 2021. "Performance evaluation and microbial community analysis of mesophilic and thermophilic sludge fermentation processes coupled with thermal hydrolysis," Renewable and Sustainable Energy Reviews, Elsevier, vol. 141(C).
    5. Yıldız Koç & Hüseyin Yağlı & Ali Koç, 2019. "Exergy Analysis and Performance Improvement of a Subcritical/Supercritical Organic Rankine Cycle (ORC) for Exhaust Gas Waste Heat Recovery in a Biogas Fuelled Combined Heat and Power (CHP) Engine Thro," Energies, MDPI, vol. 12(4), pages 1-22, February.
    6. Kor-Bicakci, Gokce & Ubay-Cokgor, Emine & Eskicioglu, Cigdem, 2019. "Effect of dewatered sludge microwave pretreatment temperature and duration on net energy generation and biosolids quality from anaerobic digestion," Energy, Elsevier, vol. 168(C), pages 782-795.

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