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Related Experiment Videos

Aerobic sludge digestion under low dissolved oxygen concentrations.

RaviSankar Arunachalam1, Hemant K Shah, Lu-Kwang Ju

  • 1Department of Chemical Engineering, University of Akron, Ohio 44325-3906, USA.

Water Environment Research : a Research Publication of the Water Environment Federation
|November 5, 2004
PubMed
Summary

Low dissolved oxygen (DO) in aerobic digesters offers cost savings and higher temperatures. While it slows specific volatile solids digestion, overall performance is favored by factors like solids concentration and temperature.

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Area of Science:

  • Environmental Engineering
  • Biotechnology
  • Wastewater Treatment

Background:

  • Low dissolved oxygen (DO) is common in aerobic digesters treating thickened sludge.
  • This condition offers benefits such as reduced digester size, lower aeration costs, and higher digestion temperatures.

Purpose of the Study:

  • To investigate the effects of low DO concentrations on sludge digestion kinetics.
  • To compare low DO digestion with fully aerobic systems and evaluate overall performance factors.

Main Methods:

  • Experiments conducted using sludge from municipal wastewater treatment plants in Akron, Ohio, and Los Lunas, New Mexico.
  • Utilized batch digestion and a mixed mode of continuous, fed-batch, and batch operations.
  • Employed model simulation to estimate kinetic parameters.

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Main Results:

  • Low DO conditions eliminated the need for pH control due to simultaneous nitrification and denitrification.
  • Low DO and higher solids loading negatively impacted specific volatile solids (VS) digestion kinetics compared to high DO systems.
  • Overall volumetric digestion performance is favored by low DO conditions due to factors like solids concentration, pH, and temperature.

Conclusions:

  • Low DO digestion of thickened sludge is advantageous overall, despite slower specific VS digestion kinetics.
  • Temperature significantly affects low DO digestion; empirical correlations may underestimate VS reduction.
  • Multistage digesters, particularly with small front-end reactors, may enhance both process and biological reaction kinetics for sludge digestion.