TABLE 2.
Water and biofilm characteristics in the first loop of the distribution system fed for 2 months with GAC water (network A) or nanofiltered water (network B)
| First loop of network: | Avg (SD [n = 3])a
|
||||||||
|---|---|---|---|---|---|---|---|---|---|
| No. liter−1 or cm−2
|
C (mg liter−1)
|
Total chlorine (mg of Cl2 liter−1) | Temp (°C) | ||||||
| Total bacterial cells | Culturable bacteria (CFU)
|
Coliforms (CFU) | Total protist cells | ||||||
| 3 days | 15 days | DOC | BDOC | ||||||
| A | |||||||||
| Water | 3.6 × 108 (4.7 × 107) | 3.2 × 104 (2.3 × 104) | 2.2 × 106 (1.3 × 106) | 0 | 1.8 × 105 (8.2 × 104) | 1.7 (0.6) | 0.55 (0.6) | 0 | 24.9 (1.8) |
| Biofilm | 4.3 × 107 (3.5 × 105) | 5.9 × 103 (6.4 × 103) | 3.3 × 105 (3.0 × 104) | 0 | 1.4 × 103 (86) | — | — | — | — |
| B | |||||||||
| Water | 5.3 × 107 (4.8 × 106) | 1.3 × 104 (9.1 × 103) | 1.7 × 105 (5.9 × 104) | 0 | 0 | 0.3 (0) | 0 | 0 | 24.5 (1.6) |
| Biofilm | 7.1 × 106 (3.6 × 105) | 2.4 × 104 (3.5 × 102) | 1.6 × 105 (1.3 × 104) | 0 | 0 | — | — | — | — |
a
0, not detectable; —, not measured.