Alvarado, Andres

Arevalo-Durazno, Maria B

Espinoza-Palacios, Juan E

Goethals, Peter

Ho, Long Tuan

Muchene, Leacky

Pham Duy, Tan

Shkedy, Ziv

Thas, Olivier

Van Echelpoel, Wout

English

Ghent University Academic Bibliography

• Higher values in terms of both concentration and variation were found close to the surface• Due to high solar radiation (≈ 1400 W.m-2), oxygen concentration could reach up to 39 mg O2.L-1SPATIOTEMPORAL EFFECTS ON OXYGEN LEVEL IN WASTE STABILIZATION POND AT HIGH ALTITUDEAECO RESEARCH UNIT - DEPARTMENT OF APPLIED ECOLOGY AND ENVIRONMENTAL BIOLOGY – GHENT UNIVERSITYLong Ho, Wout Van Echelpoel, Duy Pham, Juan Espinoza-Palacios, Maria Arevalo-Durazno, Leacky Muchene, Ziv Shkedy, Andres Alvarado, Olivier Thas, Peter Goethals Long HoLong.TuanHo@ugent.bewww.ugent.beUniversiteit Gent@ugentGhent UniversityMaterials and methods• Located at Ucubamba WSP in Cuenca, Ecuador• Two parallel lines: an aerated pond, a facultative pond and a maturation pondIntroduction• Simplicity, low cost, robustness and high efficiency• Dependence on climatic conditions, especially at high altitude.Results and discussionSpatial and temporal variations Structural equation modelingLinear mixed effect modelslogDOijk=−3.276+0.01×BODijk+0.0005×Chlorophyllijk+0.174×Water.tempijk−0.352×LnDepthijk+0.2×Daytimeijk− 0.0068×Daytimeijk2 +ak+ajk+εijk• 4 latent variables: meteorology, water pollution, time, and space• SEM allows for the estimation of direct and indirect effects of latent and manifest variables.• Non-significant effect of water pollution on oxygen level• Substantial effect of daytime and space on DO• Goodness-of-fit increases from 64% to 79% after including spatiotemporal effects as random effectsConclusions• High altitude caused lower removal efficiencies.• DO had vertically and horizontally different patterns within and among ponds.• SEM and mixed model proved their capacity on predicting the variation of DO, hence, are highly recommended in future pond modelling. 

Spatiotemporal effects on oxygen level in waste stabilization pond at high altitude

https://biblio.ugent.be/publication/8531759/file/8533114.pdf

Spatiotemporal effects on oxygen level in waste stabilization pond at high altitude

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Ghent University Academic Bibliography