Evaluation of a microbiological water purifier for inactivation of viruses, bacteria and Giardia cysts

Morteza Abbaszadegan, C. P. Gerba, M. T. Yahya, P. Rusin

Research output: Contribution to journalConference articlepeer-review


Development of the need for personal water treatment devices has evolved from consumer interest in improving and ensuring the quality of drinking water. The need also extends to the quality of untreated or partially treated waters such as that used by hikers, campers, recreational home and boat owners, and families or communities having individual home and small water sources. It is essential that such devices be capable of removing all types of pathogenic microorganisms likely to be found in contaminated water. For this reason the U.S. Environmental Protection Agency has suggested such units be capable of removing Klebsiella terrigena, Giardia cysts and enteric viruses. Three identical water purifiers were evaluated for the inactivation of rotavirus SA-11, hepatitis A virus, poliovirus type 1, the bacterial virus MS-2, Klebsiella terrigena and Giardia muris cysts. The units depend upon a thermal cycler combined with activated carbon for removal of the test organisms. The units were challenged with the organisms suspended in tapwater after 4, 76 and 240 cycles of operation. The units were also tested with a 'worst case' water quality of 1500 mg/l dissolved solids, 10 mg/l organic matter and with a water turbidity of 30 NTU. In all cases, complete inactivation of the viruses, bacteria and cysts occurred after operation of the 35-minute cycle. This resulted in a greater than 3-log (99.9%) inactivation of cysts, a greater than 6 log (99.9999%) inactivation of K. terrigena and 4-log (99.99%) inactivation of viruses. In conclusion, these units would comply with criteria guidelines suggested by the U.S. Environmental Protection Agency for the operation of microbial water purifiers.

Original languageEnglish (US)
Pages (from-to)329-333
Number of pages5
JournalWater Science and Technology
Issue number3-4
StatePublished - 1993
EventProceedings of the 16th Biennial Conference and Exposition of the International Association on Water Pollution Research and Control - Washington, DC, USA
Duration: May 24 1992May 30 1992


  • Enterovirus
  • Giardia
  • Inactivation
  • Klebsiella
  • Water purifier

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology


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