Evaluation of Fecal Coliform Prevalence and Physicochemical Indicators in the Effluent from a Wastewater Treatment Plant in the North-West Province, South Africa
Abstract
:1. Introduction
2. Materials and Method
2.1. Study Area
2.2. Sample Collections
2.3. Detection of Fecal Coliforms (E. coli)
2.4. Determination of Physicochemical Parameters
2.5. Compliance Study and Calculation of Reduction Efficiencies
3. Results
4. Discussion
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Substance/Parameter | General Authorizations | |
---|---|---|
General Limits | Special Limits | |
Fecal coliforms (per 100 mL) | 1000 | 0 |
Chemical oxygen demand (COD) (mg/L) | 75 (i) | 30 (i) |
pH | 5.5–9.5 | 5.5–7.5 |
Ammonia (as N) (mg/L) | 6 | 2 |
Nitrate (as N) (mg/L) | 15 | 1.5 |
Chlorine as free chlorine (mg/L) | 0.25 | 0 |
Suspended solids (mg/L) | 25 | 10 |
Electrical conductivity (mS/m) | 75 mS/m above intake water, to maximum of 150 | 50 mS/m above background receiving water, to maximum of 100 |
Ortho-phosphate as phosphorous (mg/L) | 10 | 1 (medium) and 2.5 (maximum) |
Fluoride mg/L | 1 | 1 |
Soap, oil or grease (ug/L) | 2500 | 0 |
Dissolved arsenic (ug/L) | 20 | 10 |
Dissolved cadmium (ug/L) | 5 | 1 |
Dissolved chromium (ug/L) | 50 | 20 |
Dissolved copper (ug/L) | 10 | 2 |
Dissolved cyanide (ug/L) | 20 | 10 |
Dissolved iron (ug/L) | 300 | 300 |
Dissolved lead (ug/L) | 10 | 6 |
Dissolved manganese (ug/L) | 100 | 100 |
Mercury and its compounds (ug/L) | 5 | 1 |
Dissolved selenium (ug/L) | 20 | 20 |
Dissolved zinc (ug/L) | 100 | 40 |
Boron (ug/L) | 1000 | 500 |
Categories | Parameter | Unit | Mean | Min | Max | * Std. dev. | General Limits | Special Limits | ||
---|---|---|---|---|---|---|---|---|---|---|
Results >Limit (n) | ** Cpl. (%) | Results >Limit (n) | ** Cpl. (%) | |||||||
Microbiological | E. coli | Count | 69 | 0 | 2420 | 249.09 | 4 | 98.81 | 324 | 3.57 |
/100 mL | ||||||||||
Physical | pH | - | 7.71 | 7.03 | 8.49 | 0.3 | 0 | 100 | 232 | 30.95 |
Electrical conductivity | mS/m | 108.23 | 81.63 | 126.5 | 8.15 | 0 | 100 | 265 | 21.13 | |
Suspended solids | mg/L | 7.62 | 0.4 | 20.4 | 3.06 | 0 | 100 | 47 | 86.01 | |
Chemical | Ammonia | mg/L | 2.1 | 0 | 22.15 | 3.63 | 24 | 92.86 | 84 | 75 |
*** COD | mg/L | 25.48 | 1 | 73 | 11.86 | 0 | 100 | 130 | 61.31 | |
Nitrate | mg/L | 5.53 | 0 | 16.1 | 3.96 | 1 | 99.7 | 285 | 22.13 | |
Ortho-phosphate | mg/L | 0.42 | 0 | 8.58 | 0.62 | 0 | 100 | 5 | 98.63 | |
Residual chlorine | mg/L | 0.69 | 0 | 3.21 | 0.51 | 273 | 18.75 | 335 | 0.3 | |
Arsenic | ug/L | 1.05 | 1 | 2 | 0.22 | 0 | 100 | 0 | 100 | |
Cadmium | ug/L | 1.5 | 1 | 3 | 0.89 | 0 | 100 | 5 | 75 | |
Lead | ug/L | 1.6 | 1 | 6 | 1.57 | 2 | 90 | 3 | 85 | |
Mercury | ug/L | 3.25 | 1 | 10 | 4 | 0 | 100 | 5 | 75 |
Months | E. coli (Count/100 mL) | Ammonia (mg/L) | COD (mg/L) | Nitrate (mg/L) | Ortho-Phosphate (mg/L) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Secondary Effluent | * F.E | ** Red % | Raw Inlet | * F.E | ** Red % | Raw Inlet | * F.E | ** Red % | Raw Inlet | * F.E | ** Red % | Raw Inlet | * F.E | ** Red % | |
May-19 | 4.93 × 104 | 70 | 99.86 | 43.64 | 0.25 | 99.43 | 674 | 27 | 95.99 | 9.24 | 7.66 | 17.1 | 5.47 | 0.49 | 91.04 |
Jun-19 | 2.06 × 104 | 46 | 99.78 | 39.81 | 0.57 | 98.57 | 694 | 32 | 95.45 | 8.29 | 8.52 | -2.77 | 4.97 | 0.61 | 87.73 |
Jul-19 | 1.03 × 104 | 36 | 99.65 | 41.24 | 0.2 | 99.52 | 709 | 27 | 96.13 | 10.6 | 11.17 | -5.38 | 5.62 | 0.38 | 93.24 |
Aug-19 | 1.39 × 104 | 35 | 99.74 | 51.98 | 0.22 | 99.58 | 727 | 29 | 96.08 | 7.93 | 9.75 | -22.95 | 6.12 | 0.36 | 94.12 |
Sep-19 | 7.45 × 103 | 68 | 99.09 | 39.21 | 0.09 | 99.77 | 792 | 33 | 95.83 | 8.65 | 8.94 | -3.35 | 6.92 | 0.48 | 93.06 |
Oct-19 | 1.17 × 105 | 54 | 99.95 | 40.46 | 0.99 | 97.55 | 805 | 28 | 96.55 | 11.82 | 4.71 | 60.15 | 7.13 | 0.35 | 95.09 |
Nov-19 | 5.42 × 105 | 103 | 99.98 | 49.58 | 7.76 | 84.35 | 741 | 27 | 96.32 | 10.19 | 1.19 | 88.32 | 7.31 | 0.22 | 96.99 |
Dec-19 | 3.07 × 105 | 98 | 99.97 | 27.64 | 5.56 | 79.88 | 413 | 24 | 94.13 | 6.19 | 1.97 | 68.17 | 4.27 | 0.32 | 92.51 |
Jan-20 | 5.67 × 104 | 123 | 99.78 | 28.06 | 0.89 | 96.83 | 206 | 15 | 92.56 | 3.35 | 2.28 | 31.94 | 3.36 | 0.45 | 86.61 |
Feb-20 | 2.29 × 104 | 76 | 99.67 | 45.04 | 2.91 | 93.54 | 356 | 17 | 95.18 | 4.75 | 1.66 | 65.05 | 4.3 | 0.51 | 88.14 |
Mar-20 | 2.42 × 105 | 51 | 99.98 | 31.75 | 3.97 | 87.5 | 293 | 21 | 92.89 | 5.23 | 2.6 | 50.29 | 3.69 | 0.46 | 87.53 |
*** Ave | 1.26 × 105 | 69 | 99.77 | 39.86 | 2.13 | 94.23 | 583 | 25 | 95.19 | 7.84 | 5.5 | 31.51 | 5.38 | 0.42 | 91.46 |
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Makuwa, S.; Tlou, M.; Fosso-Kankeu, E.; Green, E. Evaluation of Fecal Coliform Prevalence and Physicochemical Indicators in the Effluent from a Wastewater Treatment Plant in the North-West Province, South Africa. Int. J. Environ. Res. Public Health 2020, 17, 6381. https://doi.org/10.3390/ijerph17176381
Makuwa S, Tlou M, Fosso-Kankeu E, Green E. Evaluation of Fecal Coliform Prevalence and Physicochemical Indicators in the Effluent from a Wastewater Treatment Plant in the North-West Province, South Africa. International Journal of Environmental Research and Public Health. 2020; 17(17):6381. https://doi.org/10.3390/ijerph17176381
Chicago/Turabian StyleMakuwa, Stenly, Matsobane Tlou, Elvis Fosso-Kankeu, and Ezekiel Green. 2020. "Evaluation of Fecal Coliform Prevalence and Physicochemical Indicators in the Effluent from a Wastewater Treatment Plant in the North-West Province, South Africa" International Journal of Environmental Research and Public Health 17, no. 17: 6381. https://doi.org/10.3390/ijerph17176381