1.2.2. Ingestion of irrigated greywater
The probabilistic values of all treatments compared with the
WHO guideline values of risk for ingestion of irrigated greywater scenario are
showed in the table 10 below. Salmonella annual risk of infection in
worst case from C+U+GW (1.53x10-3) is higher than GW
(1.02x10-4). The annual risk of infection in all treatment exceeded
the tolerable risk of =10-6 per person per year (WHO, 2006a).
Table 10:Probabilistic values
of Greywater and Compost, Urine and Greywater treatments compared with the WHO
guideline values of the risk.
|
Pathogen
|
Treatment
|
WHO guideline values
|
|
GW
|
C+U+GW
|
10-6
|
|
Salmonella
|
1.02x10-4
|
1.53x10-3
|
Probabilistic values of Greywater and Compost, Urine
and Greywater treatments compared with the WHO guideline values of the risk are
showed by figure 10 below.
Figure 10 :
Probabilistic values of Greywater and Compost, Urine and Greywater treatments
compared with the WHO guideline values
| 
