Table 1.
Types of pools and characteristics of their filtration system
| Swimming pool | Type of swimming pool | Filters | Rinsing method |
|---|---|---|---|
| P1 | School, for swimming lessons | 2 × DN 630 mm | Air and water, every 2÷3 days |
| P2 | Water Slide | 2 × DN 2000 mm | Air and water, every 2÷3 days |
| P3 | Bath tube | 1 × DN 1200 mm | Water every 1÷2 days |
| P4 | Sports & Recreational | 2 × DN 1600 mm | Air and water, every 2÷3 days |
| P5 | For toddlers | 2 × DN 1050 mm | Air and water, every 2÷3 days |
| P6 | For toddlers | 2 × DN 1200 mm | Air and water, every 2÷3 days |
| P7 | For swimming lessons | 2 × DN 1800 mm | Air and water, every 2÷3 days |
| P8 | Sports & Recreational | 2 × DN 1800 mm | Air and water, every 3÷4 days |
| P9 | Sports & Recreational | 2 × DN 1800 mm | Water, every 7 days |
| P10 | School, for swimming lessons | 2 × DN 765 mm | Air and water, every 3÷4 days |
| P11 | Sports & Recreational | 2 × DN 1800 mm | Air and water, every 3÷4 days |
| P12 | Recreational with Water Slide | 2 × DN 1800 mm | Air and water, every 3÷4 days |
| P13 | 3 × Bath tube | 3 × DN 1400 mm | Water, every 1÷2 days |
| P14 | School, for swimming lessons | 2 × DN 765 mm | Water, every 5÷6 days |
| P15 | Water Tunnel | 2 × DN 1400 mm | Air and water, every 1÷2 days |
| P16 | Sports & Recreational | 2 × DN 1800 mm | Air and water, every 4 days |
| P17 | Recreational | 2 × DN 1600 mm | Air and water, every 4 days |
| P18 | Bath tube | 1 × DN 800 mm | Water, everyday |
| P19 | Sports & Recreational | 2 × DN 1800 mm | Air and water, every 2 days |
| P20 | Sports & Recreational | 2 × DN 1800 mm | Air and water, every 3÷4 days |
Table 2.
Comparison of impurity indicators values in raw washings with permissible values according to the Polish Regulation [15]
| Indicator | Unit | Average values of impurity indicators | Permissible value | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P1 | P2 | P3 | P4 | P5 | P6 | P7 | P8 | P9 | P10 | P11 | P12 | P13 | P14 | P15 | P16 | P17 | P18 | P19 | P20 | |||
| pH | [-] | 8.17 | 7.52 | 7.44 | 9.13 | 7.82 | 8.16 | 7.87 | 7.54 | 6.78 | 8.62 | 7.88 | 7.54 | 7.79 | 7.40 | 7.47 | 7.53 | 7.09 | 7.39 | 7.20 | 7.51 | 6.50-9.00 |
| Temperature | [°C] | 29.0 | 29.0 | 28.0 | 19.0 | 29.0 | 28.4 | 29.5 | 27.8 | - | - | 23.0 | 22.5 | 20.3 | 24.0 | 23.0 | 28.0 | 31.5 | 35.0 | 28.0 | 23.0 | 35.0 |
| Total nitrogen (TN) | [mg TN/L] | 8.68 | 9.03 | 14.50 | 9.76 | 7.85 | 3.60 | 6.98 | 11.40 | - | - | 23.80 | - | 8.83 | 23.07 | 14.44 | 8.30 | 14.30 | 26.20 | 9.55 | 15.03 | 10.00 |
| Total phosphorus (TP) | [mg TP/L] | 0.29 | 0.02 | 0.73 | 1.26 | 0.01 | 0.20 | 0.36 | 0.94 | 0.05 | 1.26 | 0.52 | - | 1.11 | 1.41 | 1.24 | 0.55 | 0.57 | 0.21 | 0.15 | 1.04 | 1.00 |
| COD | [mg O2/L] | 67.1 | 41.5 | 160.0 | 66.3 | 12.5 | 33.4 | 120.0 | 180.0 | 40.9 | 308.0 | 68.1 | 52.5 | 65.7 | 252.2 | 150.5 | 74.5 | 177.3 | 160.0 | 174.0 | 124.8 | 125.0 |
| BOD5 | [mg O2/L] | 0.7 | 0.7 | 2.3 | 0.4 | 0.4 | 25.0 | 6.0 | 15.0 | 11.0 | 23.0 | 5.5 | 6.0 | 11.4 | 2.7 | 1.7 | 11.0 | 3.0 | 1.0 | 2.5 | 2.3 | 15.0 |
| Free chlorine | [mg Cl2/L] | 0.36 | 0.50 | 0.38 | 0.00 | 0.29 | 0.02* | 0.05* | 0.04* | 0.32 | 2.39 | 0.34 | 0.41 | 0.26 | 0.32 | 0.35 | 0.51 | 0.70 | 0.49 | 0.57 | 0.21 | 0.20 |
| Chlorides | [mg Cl-/L] | 225 | 370 | 108 | 170 | 162 | 40 | 140 | 190 | 71 | 151 | 201 | 158 | 189 | 181 | 36 | 138 | 162 | 83 | 92 | 127 | 1000 |
| Aluminum | [mg Al3+/L] | 0.08 | 0.23 | 0.52 | 2.21 | 0.01 | - | - | - | 0.02 | 0.57 | 0.45 | 0.76 | 0.66 | 0.56 | 0.50 | 0.38 | 0.26 | 0.45 | 0.07 | 0.34 | 3.00 |
| Sulfates | [mg SO44 -2/L] | 437 | 137 | 177 | 238 | 137 | - | - | - | - | - | 310 | 326 | - | - | - | 441 | 98 | 75 | 115 | - | 500 |
| TSS | [mg/L] | 186 | 43 | 367 | 280 | 44 | 200 | 78 | 164 | 46 | 325 | 161 | 112 | 107 | 360 | 67 | 109 | 216 | 187 | 57 | 50 | 35 |
| TSS in supernatant | [mg/L] | 51 | 32 | 20 | 57 | 29 | 20 | 26 | 14 | 21 | 61.6 | 84 | 46 | 26 | 32 | 45 | 17 | 3 | 18 | 17 | 38 | 35 |
| Turbidity | [NTU] | 42.0 | 7.8 | 70.1 | 197 | 4.66 | 533 | 25.6 | 37.4 | 11.2 | 286 | 29 | 92.2 | 94.7 | 281 | 64.2 | 89.5 | 216 | 5.00 | 56.2 | 38.9 | - |
| Turbidity in supernatant | [NTU] | 3.2 | 4.4 | 24.6 | 11.8 | 2.6 | 37.0 | 1.8 | 1.9 | - | - | - | - | - | - | - | 8.3 | 3.0 | 5.1 | 9.0 | - | - |
Figure 1.
pH values of washings from tested pools
Figure 2.
COD values of washings from tested pools
Figure 3.
BOD5 values of washings from tested pools
Figure 4.
Total nitrogen (TN) concentration in washings from tested pools
Figure 5.
Total phosphorus (TP) in washings from tested pools
Figure 6.
Comparison of TSS content in raw washings and after sedimentation in supernatants
Figure 7.
Comparison of TSS content in supernatants after sedimentation and coagulation
Figure 8.
Concentration of free chlorine in washings from tested pools
Figure 9.
Concentration of free chlorine in raw samples and supernatant after two-hour sedimentation