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Related Experiment Videos

High-performance closed loop anaerobic digestion using pre/post sludge ozonation.

R Goel1, H Yasui, C Shibayama

  • 1Kurita Water Industries, Research and Development Center, 7-1, Wakamiya, Morinosato, Atsugi, Kanagawa, Japan 243-0124. rajeev.goel@kurita.co.jp

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|August 21, 2003
PubMed
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Post-ozonation of digested sludge significantly enhances sludge degradation efficiencies in closed-loop anaerobic digestion. This method reduces total volatile solids (TVS) accumulation and requires a lower ozone dose for optimal performance.

Area of Science:

  • Environmental Engineering
  • Biotechnology
  • Wastewater Treatment

Background:

  • Anaerobic digestion is crucial for sludge treatment, but maximizing degradation efficiency remains a challenge.
  • Pre- and post-ozonation are explored as methods to improve sludge biodegradability.
  • Closed-loop operation schemes aim to optimize reactor performance without solid withdrawal.

Purpose of the Study:

  • To evaluate the effectiveness of pre- and post-ozonation strategies for enhancing sludge degradation during anaerobic digestion.
  • To compare the performance of two ozonation configurations in a closed-loop reactor system.
  • To determine optimal ozone dosage for sludge treatment.

Main Methods:

  • Investigated two configurations: pre-ozonation of raw sludge and post-ozonation of digested sludge.

Related Experiment Videos

  • Utilized a closed-loop reactor operation scheme without solid withdrawal.
  • Measured total volatile solid (TVS) concentration, TVS removal efficiency, specific gas recovery, and soluble chemical oxygen demand (COD).

    • Main Results:

    • Post-ozonation of digested sludge demonstrated superior degradation efficiencies compared to pre-ozonation.
    • The post-ozonation configuration achieved up to 85% TVS removal efficiency with minimal TVS accumulation (26 +/- 2 g/l).
    • An ozone dose of 3% on recycle sludge was sufficient, with higher doses showing no additional benefit. Ozone requirements were estimated at 0.054 gO3/gTVS removed.

    Conclusions:

    • Post-ozonation of anaerobically digested sludge is a superior strategy for maximizing sludge degradation efficiencies.
    • This approach leads to lower total volatile solid accumulation and reduced ozone requirements.
    • The findings suggest an effective method for optimizing anaerobic digestion performance and resource recovery.