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Effect of dewatered sludge microwave pretreatment temperature and duration on net energy generation and biosolids quality from anaerobic digestion

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  • Kor-Bicakci, Gokce
  • Ubay-Cokgor, Emine
  • Eskicioglu, Cigdem

Abstract

The effects of microwave (MW) final temperature (80 and 160 °C) and holding time (1 and 30 minutes) were evaluated by ten anaerobic digesters (AD). MW was applied to dewatered secondary sludge with total solids of 10.5 ± 0.5% (by weight) to minimize energy input. Mixed sludge was digested under thermophilic and mesophilic conditions at sludge retention times (SRTs) of 20, 12, and 6 days. MW final temperature had significantly higher effect on solubilization than holding time. At MW of 80/160 °C, longer holding times further enhanced solubilization but increased volatile fatty acid accumulation at thermophilic SRT of 6 days. While all mesophilic digesters met the Class B requirement in terms of pathogens removal, all thermophilic digesters produced Class A biosolids. MW-ADs were able to tolerate 15–20% higher loading rates compared to controls. Up to 21% higher organics removals were achieved by MW. MW at 160 °C generated the highest amount of extra heat that could be used within/outside of plant. However energy recovered from the enhanced methane production was not sufficient to cover the electrical energy consumed by MW. Therefore, a custom-designed electromagnetic heating unit based on dielectric properties of sludge is needed to minimize energy input and maximize energy recovery for full-scale applications.

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  • 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.
    • Handle: RePEc:eee:energy:v:168:y:2019:i:c:p:782-795
    DOI: 10.1016/j.energy.2018.11.103
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    References listed on IDEAS

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    1. Tyagi, Vinay Kumar & Lo, Shang-Lien, 2013. "Microwave irradiation: A sustainable way for sludge treatment and resource recovery," Renewable and Sustainable Energy Reviews, Elsevier, vol. 18(C), pages 288-305.
    2. 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.
    3. 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.
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    Cited by:

    1. Kumar, Atul & Samadder, S.R., 2020. "Performance evaluation of anaerobic digestion technology for energy recovery from organic fraction of municipal solid waste: A review," Energy, Elsevier, vol. 197(C).
    2. Kor-Bicakci, Gokce & Eskicioglu, Cigdem, 2019. "Recent developments on thermal municipal sludge pretreatment technologies for enhanced anaerobic digestion," Renewable and Sustainable Energy Reviews, Elsevier, vol. 110(C), pages 423-443.
    3. Patil, Ravichandra & Cimon, Caroline & Eskicioglu, Cigdem & Goud, Vaibhav, 2021. "Effect of ozonolysis and thermal pre-treatment on rice straw hydrolysis for the enhancement of biomethane production," Renewable Energy, Elsevier, vol. 179(C), pages 467-474.
    4. 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).
    5. 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).
    6. Walczak, Justyna & Karolinczak, Beata & Zubrowska-Sudol, Monika, 2023. "Effect of co-digestion and hydrodynamic disintegration on the methane potential of sewage sludge and organic fraction of municipal solid waste with consideration of the carbon footprint," Energy, Elsevier, vol. 282(C).

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