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Wet oxidation: a pre-treatment procedure for sludge.

Nevim Genç1, Sems Yonsel, Levent Dağaşan

  • 1nevgenc@hotmail.com

Waste Management (New York, N.Y.)
|September 7, 2002
PubMed
Summary

Wet oxidation effectively treats high-organic wastewater sludge. Pre-treatment of raw sludge significantly enhanced biodegradability by 75%, while digested sludge showed minimal improvement. Settled solids volume decreased by 80%.

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Waste Management

Background:

  • Conventional methods struggle with high-organic matter wastewater sludge.
  • Wet oxidation offers a potential solution for recalcitrant organic compounds.
  • Activated sludge from yeast factories presents a specific treatment challenge.

Purpose of the Study:

  • To evaluate the effectiveness of wet oxidation for treating yeast factory sludge.
  • To assess the impact of wet oxidation on sludge biodegradability and settling properties.
  • To investigate the changes in nutrient concentrations and pH post-treatment.

Main Methods:

  • Wet oxidation of digested and raw activated sludge using copper (Cu) catalyst and hydrogen peroxide (H2O2).
  • Analysis of total organic carbon (TOC) to determine organic matter concentration.

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  • Assessment of sludge biodegradability, settling volume, and nutrient levels (NH3+-N, NO2(-)-N, NO3(-)-N).

    • Main Results:

    • Wet oxidation increased liquid-phase TOC by 16.5% in 10 min and 66% in 120 min.
    • Biodegradability increased significantly (approx. 75% TOC reduction) for raw sludge post-wet oxidation.
    • Settled solids volume decreased by 80%; nutrient levels and pH were favorably altered.

    Conclusions:

    • Wet oxidation is a promising pre-treatment for enhancing the biodegradability of raw yeast factory sludge.
    • The process improves sludge settling characteristics and alters nutrient profiles.
    • Optimized wet oxidation conditions can lead to more efficient wastewater treatment.