Table 4.
Water quality parameters of the reservoir (influent and effluent), the influent, hot- and cold-water (all three sample types were collected on the same day, but replicates were collected on different days) in buildings (Fa and ERC), and the CT. Sample collection dates are as follows: reservoir (influent and effluent), 15, 23 and 29 July and 6, 13 and 20 August; influent, hot-, and cold-water in building Fa, 12 August and 3, 16 September; influent, hot-, and cold-water in building ERC, 19 August, and 9, 23 September; CT, 25, 31 July and 7, 14 and 21 August; two cooling tower water samples were collected on the 21st.
| Temperature (°C) | Total Chlorine (mg/L) | Free Chlorine (mg/L) | Turbidity (NTU) |
pH | Conductivity (mS) | HPC (CFU/100 mL) | Total Coliforms (MPN/100 mL) | E. coli (MPN/100 mL) |
|---|---|---|---|---|---|---|---|---|
| Reservoir Influent (n = 6) | ||||||||
| 12.1 | 0 | 0 | 4.1 | 7.2 | 851 | 3.52 × 101 | <1 | <1 |
| Reservoir Effluent (n = 6) | ||||||||
| 11.9 | 0.64 | 0.33 | 3.85 | 7.2 | 855 | 2.10 × 100 | <1 | <1 |
| Building Fa Influent (n = 3) | ||||||||
| 26.8 | 0.41 | 0.35 | 8.4 | 7.3 | 897 | 8.57 × 104 | <1 | <1 |
|
Building Fa 1 st Floor Cold; n = 3
(Hot Taps; n = 3) | ||||||||
| 26.7 (28.6) |
0.16 (0.04) |
0.14 (0.02) |
3.06 (0.53) |
7.2 (7.1) |
867 (815) |
1.02 × 104 (7.3 × 103) |
<1 (<1) |
<1 (<1) |
|
Building Fa 2nd Floor Cold; n = 3
(Hot Taps; n = 3) | ||||||||
| 26.8 (28.8) |
0.05 (0.02) |
0.03 (0) |
3.37 (0.67) |
7.0 (6.9) |
856 (822) |
2.00 × 104 (3.15 × 103) |
<1 (<1) |
<1 (<1) |
| Building ERC Influent (n = 3) | ||||||||
| 31.5 | 0.31 | 0.20 | 12.5 | 7.4 | 883 | 4.32 × 105 | <1 | <1 |
|
Building ERC 1 st Floor Cold (n = 3)
(Hot Taps; n = 3) | ||||||||
| 23.5 (24.5) |
0.09 (0.04) |
0.03 (0) |
5.97 (6.27) |
7.6 (7.5) |
866 (847) |
4.38 × 105 (6.80 × 105) |
<1 (<1) |
<1 (<1) |
| CT (n = 6) | ||||||||
| 25.3 | 0.49 | 0.08 | 1.94 | 8.2 | 2564 | 2.35 × 107 | 666.6 | 17.3 |