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Pathogen removal efficiency from UASB + BF effluent using conventional and UV post-treatment systems.

R Keller1, R F Passamani-Franca, F Passamani

  • 1Dept of Environmental Engineering (CT-DEA), Universidade Federal do Espirito Santo, 29060-970 Vitoria ES, Brazil. kellygtr@npd.ufes.br

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|August 21, 2004
PubMed
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This study assessed wastewater treatment plant efficiency, finding UV disinfection effective for bacteria like E. coli but not for all helminth eggs, highlighting the need for further microbial inactivation research.

Area of Science:

  • Environmental Microbiology
  • Water Treatment Technologies

Background:

  • Wastewater treatment plants (WWTPs) are crucial for public health and environmental protection.
  • Conventional treatment processes may not fully remove all microbial contaminants, necessitating advanced disinfection methods.

Purpose of the Study:

  • To evaluate the microorganism removal efficiency of a combined wastewater treatment system (UASB reactor, biofilters, tertiary filter).
  • To assess the effectiveness of UV disinfection as a tertiary treatment step for wastewater reuse.

Main Methods:

  • A WWTP treating domestic wastewater was monitored for microbial removal.
  • UV disinfection was applied to tertiary effluent, and its efficacy against seeded pathogens (Salmonella spp., helminth eggs) and indicator organisms (E. coli, coliphages) was tested.

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Main Results:

  • The WWTP achieved high removal of organic matter and suspended solids.
  • UV disinfection significantly reduced E. coli, thermotolerant coliforms, and coliphages to safe levels for agricultural reuse.
  • While Salmonella was inactivated, UV treatment did not completely eliminate viable helminth eggs.

Conclusions:

  • The combined WWTP effectively removes many contaminants but requires UV disinfection for bacterial inactivation.
  • UV irradiation is a promising technology for wastewater disinfection, but its efficacy against helminth eggs requires further investigation for safe water reuse.