Improved Filtration Technology for Pathogen Reduction in Rural Water Supplies

  • Tellen V
  • Nkeng G
  • Dentel S
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Abstract

Intermittent bio-sand filtration (BSF) is a low-cost process for improving water quality in rural households. This study addresses its two drawbacks: flow limitations requiring excessive waiting, and inadequate purification when high flows are imposed. Two modifications were examined: increasing the sand’s effective size, and adding zero-valent iron (ZVI) into the media as a disinfectant. After 65 days, percent reductions in total coliform, fecal coliform, and fecal streptococci averaged 98.9% for traditional BSF and 99% for the improved BSF. Both modifications showed statistically significant improvements. Increased sand size and ZVI addition can counter the drawbacks of traditional BSF.

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Authors

  • Valentine Tellen

  • George Nkeng

  • Steven Dentel

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