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Related Experiment Videos

Decrease of time for pathogen inactivation in alkaline disinfection systems using pressure.

Kari B Fitzmorris1, Robert S Reimers, Jan A Oleszkiewicz

  • 1Jiann-Ping Hsu College of Public Health, Georgia Southern University, Hollis, Room 1101D, P.O. Box 8015, Statesboro, GA 30460, USA. kfitzmorris@georgiasouthern.edu

Water Environment Research : a Research Publication of the Water Environment Federation
|May 11, 2007
PubMed
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Closed system alkaline disinfection significantly enhances pathogen inactivation in biosolids, reducing treatment time from days to minutes. This method is more efficient and cost-effective for wastewater treatment. Keywords: alkaline disinfection, biosolids, pathogen inactivation, wastewater treatment.

Area of Science:

  • Environmental Engineering
  • Microbiology
  • Wastewater Treatment

Background:

  • Alkaline disinfection is a method for treating biosolids.
  • Efficiency in open systems is limited by ammonia concentration due to Henry's Law.
  • Factors influencing disinfection include ammonia concentration, pH, temperature, and solids content.

Purpose of the Study:

  • To assess the effectiveness of alkaline disinfection in a closed system.
  • To evaluate the impact of un-ionized ammonia on pathogen inactivation.
  • To compare closed versus open alkaline disinfection systems.

Main Methods:

  • Studied alkaline dosing of dewatered raw, aerobically digested, and anaerobically digested municipal sludge cake.
  • Assessed un-ionized ammonia concentrations from 0.05% to 2% on a dry-weight basis.

Related Experiment Videos

  • Compared inactivation rates in closed pressurized systems versus open systems.

    • Main Results:

    • Inactivation of Ascaris suum eggs increased from 50% to 99% as temperature rose from 40°C to 55°C, achieving Class A levels.
    • Closed systems greatly increased the effect of un-ionized ammonia.
    • Treatment time for pathogen inactivation was reduced from hours/days to minutes in closed systems.

    Conclusions:

    • Closed-system alkaline disinfection is highly effective for biosolids treatment.
    • Optimized closed systems offer energy efficiency, cost-effectiveness, and odor control.
    • Future developments will focus on optimizing factors for lower alkaline agent doses.