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Updated: Jan 23, 2026

Porphyromonas gingivalis as a Model Organism for Assessing Interaction of Anaerobic Bacteria with Host Cells
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Anaerobic-aerobic sequential treatment: Temperature optimization and cost implications.

Sophia Ghanimeh1, Charbel Abou Khalil1, Domenica Mosca Angelucci2

  • 1Department of Civil and Environmental Engineering, Notre Dame University-Louaize , Zouk Mosbeh , Lebanon.

Journal of the Air & Waste Management Association (1995)
|June 12, 2019
PubMed
Summary

Optimizing the aerobic polishing stage of waste treatment by raising the temperature to the mesophilic range significantly improves effluent quality. This approach halves chemical oxygen demand and solids concentrations, offering favorable operational costs.

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Area of Science:

  • Environmental Engineering
  • Waste Management
  • Biotechnology

Background:

  • Anaerobic digestion (AD) is a common waste treatment, but post-processing is crucial for effluent quality.
  • Aerobic polishing is typically operated at ambient temperatures.
  • Optimizing aerobic treatment can enhance overall waste management efficiency.

Purpose of the Study:

  • To investigate the impact of psychrophilic versus mesophilic temperatures in the aerobic stage of an anaerobic-aerobic sequential system (AASS).
  • To evaluate the effect of temperature optimization on effluent quality, nutrient removal, and operational costs.
  • To assess the co-digestion of raw wastewater and food waste within the AASS.

Main Methods:

  • An anaerobic-aerobic sequential system (AASS) was used for co-digesting raw wastewater and food waste.
  • The aerobic compartment was operated under both psychrophilic and mesophilic temperature conditions.
  • Key performance indicators including volatile solids (VS), chemical oxygen demand (COD), nitrification, and denitrification were monitored.

Main Results:

  • The anaerobic digester achieved high removal efficiencies for VS (85%) and COD (84%).
  • Operating the aerobic reactor at mesophilic temperatures halved effluent COD and solids concentrations compared to psychrophilic conditions.
  • Mesophilic operation increased nitrification from 68% to 91% and denitrification from 10% to 16%.

Conclusions:

  • Raising the aerobic reactor temperature to the mesophilic range significantly enhances effluent quality from AASS treating food waste and wastewater.
  • Mesophilic operation leads to substantial reductions in effluent solids and COD, alongside improved nutrient removal.
  • The optimized aerobic stage presents favorable operational costs, considering sludge disposal and energy revenues, making it a viable strategy for urban waste management.