In view of the lack of detailed information on the ciliated
Protozoa from GBH systems, this study was made to (1) characterize
the ciliate species present in such systems used for sewage
treatment, (2) describe the distributional pattern of ciliated
Protozoa within GBH systems, (3) explain the importance of
ciliate organisms in raising the biological efficiency of the pilot
system used for sewage purification in Ismailia.