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Thermophilic digestion of waste-activated sludge coupled with solar pond

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  • Zhang, Guodong
  • Wu, Zhiyue
  • Cheng, Fangqin
  • Min, Zhang
  • Lee, Duu-Jong

Abstract

Thermophilic anaerobic digestion (AD) is an efficient treatment process for waste activated sludge with enhanced hydrolysis and digestion rates. However, the costs associated with maintaining high temperature for thermophilic digester should be minimized and the thermal stability of the reactor should be maximized for its practical use. This study tested an integrated system consisting of a solar pond and an AD reactor for digestion of waste activated sludge. The integrated system could be stably operated at 51.6 ± 1.5 °C in sunny days (and nights) and maintained digestion performance over at least three days with cloud and rain. On the contrary, the control reactor without solar pond experienced significant temperature fluctuation and poor digestion performance. After 29d, the integrated system thermophilic reactor removed 65.0 ± 4.2% of total chemical oxygen demands and produced 79% excess biogas. The concentrations of soluble chemical oxygen demand, protein and saccharides in digester with solar pond were higher than those in that without the pond. Also, the presence of solar pond enhanced hydrolysis and degradation of soluble microbial byproduct-like compounds with carboxylic groups and amide-2 groups in sludge.

Suggested Citation

  • Zhang, Guodong & Wu, Zhiyue & Cheng, Fangqin & Min, Zhang & Lee, Duu-Jong, 2016. "Thermophilic digestion of waste-activated sludge coupled with solar pond," Renewable Energy, Elsevier, vol. 98(C), pages 142-147.
    • Handle: RePEc:eee:renene:v:98:y:2016:i:c:p:142-147
    DOI: 10.1016/j.renene.2016.03.052
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    References listed on IDEAS

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    1. Li, Huan & Jin, Chang & Zhang, Zhanying & O'Hara, Ian & Mundree, Sagadevan, 2017. "Environmental and economic life cycle assessment of energy recovery from sewage sludge through different anaerobic digestion pathways," Energy, Elsevier, vol. 126(C), pages 649-657.
    2. Ruffino, Barbara & Cerutti, Alberto & Campo, Giuseppe & Scibilia, Gerardo & Lorenzi, Eugenio & Zanetti, Mariachiara, 2020. "Thermophilic vs. mesophilic anaerobic digestion of waste activated sludge: Modelling and energy balance for its applicability at a full scale WWTP," Renewable Energy, Elsevier, vol. 156(C), pages 235-248.
    3. Montalvo, Silvio & Vielma, Stephania & Borja, Rafael & Huiliñir, César & Guerrero, Lorna, 2018. "Increase in biogas production in anaerobic sludge digestion by combining aerobic hydrolysis and addition of metallic wastes," Renewable Energy, Elsevier, vol. 123(C), pages 541-548.

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