2002 Volume 55 Issue 6 Pages 371-374
A survey of Cryptosporidium in pre- and post-treatment wastewater was conducted on 11 water samples of each kind collected from a livestock slaughterhouse (LSH) and a poultry slaughterhouse (PSH) in Hyogo Prefecture. Immuno-magnetic separation examinations revealed Cryptosporidium oocysts in 55% of pre-treatment and 36% of post-treatment wastewater in the case of the LSH. In the case of the PSH, 64% of pre-treatment and 45% of post-treatment wastewater were positive for Cryptosporidium. Mean numbers of oocysts are as follows: LSH-58/l for pre-treatment and 5/l for post-treatment wastewater; PSH-515/l for pre-treatment and 12/l for post-treatment wastewater. The number of oocysts detected in post-treatment water was < 1/10 than the number in pre-treatment water, indicating that about 10% of the oocysts in pre-treatment wastewater were released into a nearby river.
