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Energy feasibility study of sludge pretreatments: A review

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  • Cano, R.
  • Pérez-Elvira, S.I.
  • Fdz-Polanco, F.

Abstract

Most of the pretreatments to sewage sludge in lab-scale studies show high potentials to be implemented in an anaerobic digester since they produce an increase in the biogas production. However, no energy assessments are usually considered in scientific reports. By making a simple evaluation of energy consumption by pretreatments, it can be stated that unfortunately not all the pretreatment technologies have an energy self-sufficiency to be implemented in a WWTP, requiring many times a continuous energy investment. Generally, pretreatments consuming electricity do not satisfy its energy demands from the biogas production in the same process, although high solubilization or biogas production increases are reached. Just ultrasounds applied in full-scale plants, with commercial technologies such as Sonix or Biosonator, provide an energetically self-sufficient pretreatment. In the case of thermal pretreatments, the potential to be implemented with full energy integration is much higher, since they can recover heat from the biogas engine as well as electrical energy in the same extent as for electric pretreatments. This way, full energy integration can be achieved in thermal hydrolysis plants; such is the case of commercial technologies such as Cambi, Exelys (Veolia) or CTH (Aqualogy). Several theoretical approaches and simulations also state that thermal hydrolysis presents a high potential to be fully integrated in WWTP with a complete energy recovery and self-sufficiency.

Suggested Citation

  • 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.
  • Handle: RePEc:eee:appene:v:149:y:2015:i:c:p:176-185
    DOI: 10.1016/j.apenergy.2015.03.132
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    References listed on IDEAS

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    1. Ariunbaatar, Javkhlan & Panico, Antonio & Esposito, Giovanni & Pirozzi, Francesco & Lens, Piet N.L., 2014. "Pretreatment methods to enhance anaerobic digestion of organic solid waste," Applied Energy, Elsevier, vol. 123(C), pages 143-156.
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    4. Ebenezer, A. Vimala & Arulazhagan, P. & Adish Kumar, S. & Yeom, Ick-Tae & Rajesh Banu, J., 2015. "Effect of deflocculation on the efficiency of low-energy microwave pretreatment and anaerobic biodegradation of waste activated sludge," Applied Energy, Elsevier, vol. 145(C), pages 104-110.
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