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Removing Giardia and Cryptosporidium by conventional treatment and direct filtration
Author(s) -
Nieminski Eva C.,
Ongerth Jerry E.
Publication year - 1995
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1995.tb06426.x
Subject(s) - turbidity , giardia , cryptosporidium , filtration (mathematics) , water treatment , cyst , raw water , biology , positive correlation , water quality , pilot plant , environmental engineering , microbiology and biotechnology , environmental science , zoology , veterinary medicine , chemistry , ecology , medicine , mathematics , surgery , feces , statistics , organic chemistry
Data on Giardia cyst and Cryptosporidium oocyst removal correlated with the removal of particles of each cyst's size range, regardless of the treatment mode. A two‐year evaluation of Giardia cyst and Cryptosporidium oocyst removal was conducted at a full‐scale 900‐gpm water treatment plant and at a 0.5‐gpm pilot plant, both operated under conventional treatment and direct filtration regimes. Raw water quality (turbidity and algal content), as well as treatment effectiveness in removing turbidity, controlled the removal of seeded cysts more than the mode of treatment. A high correlation was found between cyst removal rates and removal of the respective size particles; poorer correlation was found between the cysts and turbidity removal, whereas no correlation was established between the removals of cysts and heterotrophic bacteria.