Table 1 Concentration of Salmonella spp. (MPN/g TS) in sewage sludge samples collected from the five WWTPs in 2011
Date | WWTP 1 | WWTP 2 | WWTP 3 | WWTP 4 | WWTP 5 |
|---|---|---|---|---|---|
Jan | <0.006473 | <0.006473 | <0.006473 | 0.43 | <0.006473 |
Feb | <0.006473 | 1.74 | <0.006473 | 0.49 | 0.43 |
Mar | <0.006473 | 3.72 | NP | <0.006473 | <0.006473 |
Apr | <0.006473 | 6.03 | <0.006473 | 0.21 | <0.006473 |
May | <0.006473 | 4.81 | <0.006473 | <0.006473 | <0.006473 |
Jun | <0.006473 | 5.63 | <0.006473 | NP | <0.006473 |
Jul | <0.006473 | 2.28 | NP | 1.32 | <0.006473 |
Aug | <0.006473 | 12.20 | NP | <0.006473 | <0.006473 |
Sep | <0.006473 | 3.29 | NP | 0.69 | <0.006473 |
Oct | <0.006473 | 1.66 | <0.006473 | 0.76 | <0.006473 |
Nov | 0.75 | 5.74 | NP | 0.85 | <0.006473 |
Dec | <0.006473 | 4.45 | <0.006473 | 1.86 | <0.006473 |