Alvarado, Andres

Goethals, Peter

Ho, Long Tuan

Pham Duy, Tan

Van Echelpoel, Wout

Ghent University Academic Bibliography

1. Variations among the ponds3. Diurnal variations 2. Spatial variations within the ponds1• Simplicity, low cost, robustness and high efficiency.• The performance of WSPs is dependent on climatic conditions.• Extreme climatic conditions at high altitude: strong solar radiation, low oxygenpressure, low mean temperatures, etc.a Laboratory of Environmental Toxicology and Aquatic Ecology, Ghent University, Belgium.b Departamento de Recursos Hídricos y Ciencias Ambientales, Universidad de Cuenca, Ecuador.Long Tuan Ho a*, Duy Tan Phama, Wout Van Echelpoela, Andres Alvaradob, Peter L.M. GoethalsaTemporal and spatial variations of dissolved oxygen, pH, and chlorophyll a in waste stabilization pond system at high altitude (Ecuador).BACKGROUNDOBJECTIVES• To investigate how high altitude properties impact on the behaviour of the pondsystem via the effects of wastewater constituents and climatic conditions withinand among the pond treatment system• To obtain adequate strategies for designing, monitoring, and operation highaltitude pond treatment system.ACKNOWLEDGMENTSRESULTS AND DISCUSSIONSThis research was performed in the context of the VLIR Ecuador Biodiversity Network project. This project was funded by the Vlaamse Interuniversitaire Raad-Universitaire Ontwikkelingssamenwerking (VLIR-UOS), which supportspartnerships between universities and university colleges in Flanders and the South. We are grateful to ETAPA for allowing us to use their facilities and wastewater treatment pond system to perform this research. Long Tuan Ho issupported by the special research fund (BOF) of Ghent University. Duy Tan Pham is supported by a PhD grant of the Vietnamese government.PondDO(mg.L-1)Chlorophyll a(µg.L-1)BOD5(mg.L-1)TP(mg.L-1)TKN (mg.L-1)TS (mg.L-1)FP1Surface12.8 ± 2.0 471 ± 15 42 ± 2 3.1 ± 0.2 30 ± 1.3 385 ± 3016.1 ± 2.4 500 ± 0 38 ± 7 2.4 ± 0.6 24 ± 2.0 377 ± 1266.5 ± 4.1 360 ± 120 46 ± 7 2.9 ± 0.1 27 ± 1.7 388 ± 64FP1Bottom10.8 ± 5.4 322 ± 170 43 ± 2 3.4 ± 0.7 29 ± 2.8 424 ± 1058.1 ± 5.9 433 ± 102 38 ± 10 2.3 ± 0.3 24 ± 2.1 359 ± 442.3 ± 2.5 275 ± 166 28 ± 3 2.2 ± 0.1 24 ± 2.0 315 ± 27FP2Surface4.8 ± 2.5 313 ± 122 32 ± 4 2.7 ± 0.1 26 ± 0.3 332 ± 338.9 ± 4.2 482 ± 36 30 ± 7 2.3 ± 0.2 24 ± 0.3 314 ± 315.0 ± 2.8 375 ± 135 31 ± 9 2.6 ± 0.7 24 ± 0.3 371 ± 64FP2Bottom0.5 ± 0.4 260 ± 122 27 ± 3 3.0 ± 0.1 26 ± 0.7 338 ± 101.5 ± 1.2 389 ± 145 25 ± 1 2.2 ± 0.3 23 ± 1.0 303 ± 290.7 ± 0.6 81 ± 159 25 ± 2 2.4 ± 0.3 23 ± 0.4 325 ± 43MP1Surface1.6 ± 0.8 166 ± 43 19 ± 1 2.5 ± 0.0 25 ± 1.5 300 ± 43.3 ± 2.3 325 ± 95 22 ± 1 1.8 ± 0.1 23 ± 1.0 259 ± 52.4 ± 0.6 111 ± 32 18 ± 2 2.3 ± 0.0 23 ± 0.7 259 ± 6MP1Bottom0.5 ± 0.5 175 ± 130 19 ± 1 2.6 ± 0.1 26 ± 2.1 298 ± 40.3 ± 0.2 112 ± 166 24 ± 5 1.9 ± 0.3 24 ± 0.3 292 ± 450.7 ± 0.7 200 ± 158 20 ± 3 2.3 ± 0.0 23 ± 0.6 264 ± 9MP2Surface7.0 ± 1.3 275 ± 45 23 ± 4 2.4 ± 0.0 26 ± 1.5 307 ± 76.7 ± 1.0 210 ± 65 15 ± 0 1.9 ± 0.1 21 ± 0.3 262 ± 114.4 ± 0.3 170 ± 42 17 ± 2 1.9 ± 0.1 21 ± 1.0 284 ± 5MP2Bottom2.3 ± 1.5 63 ± 42 17 ± 4 2.5 ± 0.1 25 ± 2.3 291 ± 332.7 ± 0.4 71 ± 25 18 ± 1 2.5 ± 1.2 20 ± 0.9 263 ± 80.7 ± 0.6 59 ± 104 14 ± 1 2.0 ± 0.1 22 ± 0.4 285 ± 94. Insights for pond design, monitoring, and operation• WSPs at high altitude requires longer HRT, meaning bigger size.• Monitoring campaigns at different climatic conditions and full range of expected influent compositions.• A sufficient removal of accumulated sludge is recommended• High altitude caused lower removal efficiencies.• Lower mean temperature more sensitive to alterations in pollutant loadings• DO, pH, and chlorophyll a had vertically and horizontally different patterns within and among ponds.• Adequate strategies for design, monitoring, and operation• Located at Ucubamba, 2560 m.a.s.l, 2 identical flow lines: an aerated pond (AP), afacultative pond (FP) and a maturation pond (MP).• Samples were taken at 9 different locations at two depths, 30 cm below the watersurface and 15 cm above the sediment layer.• FP1: approx. 20% higher pollutants.• DO, pH, and chlorophyll a:high variability between 2 depths.• Higher concentration of chlorophyll a in FPs.• 2 depths: BOD5, nutrients, and TS: homogenous. DO and chlorophyll a: various. • FP1: 5 mg O2.L-1 higher but MP1 ≈1/2 MP2.• O2 ↓ 5 times in the 1stline.• Highest O2 in FPs: middle, MPs: input area • Highest DO and pH between 1 pm and 3 pm• Highest O2: almost 20 mg.L-1MATERIALS AND METHODSCONCLUSIONS

Temporal and spatial variations of dissolved oxygen, pH, and chlorophyll a in waste stabilization pond system at high altitude

https://biblio.ugent.be/publication/8531771/file/8531780

Temporal and spatial variations of dissolved oxygen, pH, and chlorophyll a in waste stabilization pond system at high altitude

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