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Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
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Sludge ozonation: disintegration, supernatant changes and mechanisms.

Guangming Zhang1, Jing Yang, Huanzhi Liu

  • 1State Key Lab of Urban Water Environment Resource, Harbin Institute of Technology, Harbin, China. gmgwen@gmail.com

Bioresource Technology
|October 7, 2008
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Summary

Ozone effectively disintegrates sludge by damaging microbial cells, with 50 mgO(3)/gDS being optimal. This process significantly increases soluble pollutants in the supernatant while reducing sludge bioactivity and heavy metal partitioning.

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Chemical Oxidation Processes

Background:

  • Wastewater sludge treatment presents challenges in disposal and resource recovery.
  • Ozonation is a powerful oxidation technique with potential for sludge management.
  • Understanding sludge disintegration mechanisms is crucial for optimizing treatment.

Purpose of the Study:

  • To investigate sludge disintegration and supernatant alterations during ozonation.
  • To elucidate the mechanisms behind ozone-induced sludge lysis.
  • To determine the optimal ozone dosage for effective sludge treatment.

Main Methods:

  • Detailed analysis of sludge disintegration and supernatant composition changes.
  • Application of varying ozone doses (mgO(3)/gDS) to sludge samples.
  • Measurement of sludge disintegration degree, solid/volatile solids reduction, and supernatant pollutant concentrations.

Main Results:

  • Optimal sludge lysis achieved at 50 mgO(3)/gDS, resulting in 46.7% disintegration.
  • Significant reductions in sludge solid (49.1%) and volatile solids (45.7%).
  • Marked increases in supernatant soluble chemical oxygen demand (699%), total nitrogen (169%), total phosphorus (2379%), protein (602%), polysaccharide (528%), and DNA (556%).

Conclusions:

  • Ozone effectively lyses sludge, primarily through microbial cell damage.
  • The optimal ozone dose of 50 mgO(3)/gDS enhances sludge disintegration and pollutant release.
  • Ozonation reduces sludge bioactivity and heavy metal partitioning, offering potential for improved sludge management.