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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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    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.
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    3. 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.
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    Cited by:

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    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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    5. 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.
    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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