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Impact of thermal pretreatment on anaerobic digestion of dewatered sludge from municipal and industrial wastewaters and its economic feasibility

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  • Kim, Gi-Beom
  • Cayetano, Roent Dune A.
  • Park, Jungsu
  • Jo, Yura
  • Jeong, Seong Yeob
  • Lee, Myung Yeol
  • Pandey, Ashok
  • Kim, Sang-Hyoun

Abstract

This study aimed to evaluate the effect of thermal pretreatment on anaerobic digestion (AD) of dewatered sludge. Thermal pretreatment was conducted at varying temperatures (40–220 °C) and durations (1–3 h), prior to batch biomethane production. The highest biomethane yield of 195 mL CH4/g VSfeed was achieved at 140 °C for 3 h, which was 81% higher than that of the control. However, the net cash flow of 76,942 USD/yr was achieved at 60 °C for 3 h. The solubilization of chemical oxygen demand and cell lysis were accompanied by a relative abundance of Firmicutes in the bacterial population during batch digestion, implying that thermal pretreatment promoted the growth of hydrolytic bacteria. In the methanogenic archaeal population, the proportion of hydrogenotrophs and electrotrophs increased, indicating that pretreatment enhanced the interspecies transfer of H2 and electrons. Economic analysis revealed that pretreatment at 40 °C for 1 h, 60 °C for 1–3 h and 100 °C for 3 h could be beneficial to AD of dewatered sludge. However, a sensitivity analysis confirmed that 60 °C for 3 h is the most economical pretreatment condition. AD accompanied by mild thermal pretreatment is a viable treatment method for dewatered sludge discharged from small wastewater treatment facilities.

Suggested Citation

  • Kim, Gi-Beom & Cayetano, Roent Dune A. & Park, Jungsu & Jo, Yura & Jeong, Seong Yeob & Lee, Myung Yeol & Pandey, Ashok & Kim, Sang-Hyoun, 2022. "Impact of thermal pretreatment on anaerobic digestion of dewatered sludge from municipal and industrial wastewaters and its economic feasibility," Energy, Elsevier, vol. 254(PB).
    • Handle: RePEc:eee:energy:v:254:y:2022:i:pb:s0360544222012488
    DOI: 10.1016/j.energy.2022.124345
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    References listed on IDEAS

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    1. Lee, Boreum & Park, Junhyung & Lee, Hyunjun & Byun, Manhee & Yoon, Chang Won & Lim, Hankwon, 2019. "Assessment of the economic potential: COx-free hydrogen production from renewables via ammonia decomposition for small-sized H2 refueling stations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 113(C), pages 1-1.
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    3. Nges, Ivo Achu & Liu, Jing, 2009. "Effects of anaerobic pre-treatment on the degradation of dewatered-sewage sludge," Renewable Energy, Elsevier, vol. 34(7), pages 1795-1800.
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    1. Wang, Zhongzhong & Hu, Yuansheng & Wang, Shun & Wu, Guangxue & Zhan, Xinmin, 2023. "A critical review on dry anaerobic digestion of organic waste: Characteristics, operational conditions, and improvement strategies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 176(C).
    2. Campo, Giuseppe & Cerutti, Alberto & Zanetti, Mariachiara & De Ceglia, Margherita & Scibilia, Gerardo & Ruffino, Barbara, 2023. "A modelling approach for the assessment of energy recovery and impact on the water line of sludge pre-treatments," Energy, Elsevier, vol. 274(C).

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