The outbreak of cryptosporidiosis in Ogose in 1996 forced the wastewater treatment authorities to rethink the level of contamination by Cryptosporidium of wastewater and waters in the watersheds and counter-measures in wastewater treatment plants. A survey of Cryptosporidium concentrations in wastewater and treated wastewater conducted nationwide showed relatively low levels. Also, evaluation of wastewater treatment showed a 2 log oocyst removal with an activated sludge process and an additional 1 log removal with coagulant dosing.
Occurrence of Cryptosporidium in Japan and counter-measures in wastewater treatment plants
M. Suwa, Y. Suzuki; Occurrence of Cryptosporidium in Japan and counter-measures in wastewater treatment plants. Water Sci Technol 1 June 2001; 43 (12): 183–186. doi: https://doi.org/10.2166/wst.2001.0734
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