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Bacterial inactivation and regrowth in ozonated activated sludges.

C Fall1, B C Silva-Hernández1

  • 1Universidad Autónoma del Estado de México (UAEM, CIRA), col. Centro, C.P. 50000, Toluca, Mexico.

Chemosphere
|September 26, 2017
PubMed
Summary

Ozonation of activated sludge (AS) significantly boosts the heterotrophic maximum specific growth rate (μHmax), promoting fast-growing bacteria. This enhances activated sludge models (ASMs) for wastewater treatment and disinfection.

Keywords:
Activated sludgeBacterial regrowthHeterotrophic growth rateModelingOzoneSludge reduction

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Area of Science:

  • Environmental Engineering
  • Microbiology
  • Chemical Engineering

Background:

  • Excess sludge production is a major challenge in wastewater treatment.
  • Ozonation is an emerging technology for sludge reduction.
  • Activated sludge models (ASMs) are crucial for process optimization.

Purpose of the Study:

  • To evaluate the impact of ozonation on kinetic parameters of activated sludge models (ASMs).
  • To determine changes in the heterotrophic maximum specific growth rate (μHmax) after ozonation.
  • To assess the microbial community response to ozonation and subsequent regrowth.

Main Methods:

  • Batch ozonation of three different sludge types (S1, S2, S3) with varying ozone doses.
  • Respirometry measurements to determine μHmax.
  • Analysis of microbial regrowth after digestion and ozonation.

Main Results:

  • μHmax significantly increased from 3.5 d⁻¹ to over 10 d⁻¹ in ozonated sludges.
  • Ozonation selected for fast-growing bacteria, despite initial inactivation and lag times.
  • Microorganisms demonstrated enhanced regrowth capabilities after digestion and ozonation.

Conclusions:

  • Ozonation alters AS microbial communities, favoring rapid growth kinetics.
  • The findings are relevant for applying ASMs to ozone-AS processes.
  • Ozonation shows potential for enhancing wastewater disinfection.