TABLE 1.
Effect of the sewage sludge activation process on the removal of viable human enteropathogensa
| Wastewater plant | Pathogen species | Pathogen concn in:
|
Removal efficiency (%) | |
|---|---|---|---|---|
| AcSS | SSC | |||
| Collooney | Cryptosporidium parvum/ C. hominis | 320 | 110 | 65.6 |
| Giardia lamblia | 1,100 | 43 | 96.1 | |
| Enterocytozoon bieneusi | 245 | 13 | 94.7 | |
| Encephalitozoon intestinalis | 47 | 5 | 89.4 | |
| Strandhill | Cryptosporidium parvum/ C. hominis | 43 | 5 | 88.4 |
| Giardia lamblia | 540 | 3 | 99.4 | |
| Enterocytozoon bieneusi | 31 | 5 | 83.9 | |
| Grange | Cryptosporidium parvum/ C. hominis | 650 | 64 | 90.2 |
| Giardia lamblia | 890 | 114 | 87.2 | |
| Enterocytozoon bieneusi | 247 | 33 | 86.7 | |
| Encephalitozoon intestinalis | 54 | 3 | 94.4 | |
| Keadue | Cryptosporidium parvum/ C. hominis | 0* | 0 | |
| Giardia lamblia | 1,540* | 5 | ||
| Enterocytozoon bieneusi | 371* | 0 | ||
a
The concentrations of enteropathogens in activated sewage sludge (in cells/liter) during the activation process and in the corresponding sewage sludge cake samples (in cells/kg) were compared. AcSS, activated sewage sludge; SSC, sewage sludge cake; *, final effluent from wetland filtration treatment.