Table 2.
Concentrations of SARS-CoV-2 measured with traditional method and passive sampling.
| WWTP | Collection date | Wastewater (Log gc /100 ml) | Zetapor (Log gc/32 cm2) |
Nylon (Log gc/32 cm2) |
||
|---|---|---|---|---|---|---|
| 4 h | 24 h | 4 h | 24 h | |||
| A | 6/9/2020 | 3.5 | ND | ND | ND | ND |
| B | 6/2/2020 | 3.4 | ND | ND | ND | ND |
| B | 6/9/2020 | 3.5 | ND | ND | ND | ND |
| A | 8/4/2020 | 3.2 | 3.2 | ND | 3.2 | 2.4 |
| B | 8/4/2020 | 3.3 | 2.2 | 2.3 | ND | 2.2 |
| B | 8/25/2020 | 3.5 | 1.1 | ND | 1.3 | 1.9 |
| B | 9/22/2020 | 4.2 | 2.7 | 3.0 | ND | 3.5 |
| A | 10/20/2020 | 4.3 | 3.2 | 2.5 | ND | 3.2 |
| A | 11/4/2020 | 4.5 | 2.6 | 3.7 | 2.6 | 3.6 |
| A | 11/9/2020 | 3.3 | ND | 3.7 | 3.0 | 3.7 |
| A | 11/17/2020 | 4.1 | 2.4 | 3.5 | 3.4 | 3.4 |
| A | 11/24/2020 | 3.7 | ND | 2.5 | ND | 3.6 |
| B | 11/24/2020 | 4.2 | 1.8 | ND | ND | 2.6 |
| Ba | 3/31/2121 | 3.7 | 2.5 | 2.9 | 2.5 | 2.8 |
| Aa | 3/31/2121 | 3.9 | 2.5 | 2.8 | 2.4 | 2.4 |
| Ba | 4/6/2121 | 4.3 | 3.0 | 3.1 | 2.25 | 2.7 |
| Aa | 4/6/2021 | 4.4 | 3.1 | 3.1 | 1.0 | 2.2 |
| Ba | 4/13/2021 | 4.3 | 3.4 | 3.2 | 3.5 | 3.4 |
| Aa | 4/13/2021 | 4.02 | 3.1 | 3.0 | 2.9 | 2.7 |
Wastewater samples were collected from two WWTP (sites A & B), from June 2020 to April 2021. Nylon and Zetapor membranes were immersed for 4 h or 24 h either in thawed or freshly collected samples. ND = not detected (No Ct).
a
Freshly collected samples.