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Seasonal Variation and Removal of Organic Pollutants in Wastewater Using Low-Cost Treatment Technologies in Tamale Metropolis, Ghana

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Journal of Water Resource and Protection 2021年第4期13卷 271-282页

作者： felix k. abagale West African Centre for Water Irrigation and Sustainable Agriculture University for Development Studies Tamale Ghana

The use of wastewater as alternative source of water for vegetable crop irrigation has become an eminent component of urban agriculture due to current global water crises in most developing countries, and admits the increasing effects of global climate change. The practise is however noted to be associated with significant health and environment risk.due to excessive pollutant load. The study assessed the level of seasonal variation and removal of organic pollutants in wastewater using gravel filters combined with stabilisation ponds at Zagyuri in the Tamale Metropolis. The yard scale experiment consisted of cylindrical containers of different length filled with six different sizes of filter media and connected to stabilisation ponds where wastewater is allowed to pass through for filtration and stabilisation. The results indicated that for both seasons, the average concentration of BOD released into the stream at Zagyuri was 92.98 mg/l and 103.54 mg/l for the dry and wet season respectively whilst the COD was averaged 132.78 mg/l and 143.75 mg/l for the dry and wet seasons respectively. The results of the simple linear regression revealed a strong positive linear relationship between BOD and COD with coefficient of determination (R2) of 0.873 which was statistically highly significantly at Pr value of Pr values of 0.0011 and 5 and COD. The average concentration of BOD was higher than the Ghana EPA recommended levels while that of COD was lower and thus within safety range for discharge into the environment.

关键词： Organic Pollutant BOD5 COD Wastewater Treatment

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Estimation of Infiltration Models’ Parameters Using Regression Analysis in Irrigation Fields of Northern Ghana

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Open Journal of Soil Science 2021年第3期11卷 164-176页

作者： Abdallah Salifu felix. k. abagale Gordana k.anjac-Berisavljevic Department of Agricultural Mechanisation and Irrigation Technology Faculty of Agriculture Food and Consumer Sciences University for Development Studies Tamale Ghana West African Centre for Water Irrigation and Sustainable Agriculture University for Development Studies Tamale Ghana

The quantification of soil infiltration is necessary for the estimation of water accessibility in soils for plant growth and development. Field infiltration tests runs were conducted on agricultural soils in three irrigation sites of Northern Ghana. The field data were fitted into Green and Ampt, k.stiak.v, Philip, Holtan, Soil Conservation Service and Horton infiltration models for the determination of the unk.own model parameters. Regression analysis at 95% confidence level using GraphPad Prism 8. Laboratory and field data on infiltration were used for the model fitting and the unk.own parameters were determined using the calibrated models. The k./i> and n parameters of k.stiak.v model at Bontanga study site were found to be k./i> = 28.0027 and n = 0.5902, k./i> = 17.0294 and n = 0.4504 for Golinga and k./i> = 23.0356 and n = 0.6339 for Libga. For all the models, the coefficient of determination ranged from 0.7612 to 0.9876 indicating strong relationships. Only Holtan model gave different values at all the three study sites. The parameter GIa and ic of the Holtan model drawn from hydrologic soil group were the same at all the study sites because of the same vegetative cover and surface conditions. The study observed the values of the parameters to have influenced the models’ performance.

关键词： Parameter Infiltration Model Regression Sorptivity Transmissivity

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Assessment of the Recent Hydromorphological Features of Nok.ue Lak. and Its Channels (South-East Benin)

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Open Journal of Modern Hydrology 2024年第1期14卷 33-55页

作者： Tètchodiwèï Julie-Billard Yonouwinhi Gérard Alfred Franck.Assiom d’Almeida felix k.fi abagale Ak.emaho Virgile Onésime Ak.wanou Laboratory of Applied Hydrology (LHA) National Institute of water (INE) African Centre of Excellence for Water and Sanitation (C2EA) University of Abomey-Calavi (UAC) Cotonou Benin International Chair in Mathematical Physics and Applications (ICMPA–UNESCO Chair) University of Abomey-Calavi (UAC) Cotonou Benin Laboratory of Geology Mining and Environment (LGME) Faculty of Science and Technology (FAST) University of Abomey-Calavi (UAC) Cotonou Benin West African Centre for Water Irrigation and Sustainable Agriculture (WACWISA) University of Development Studies (UDS) Tamale Ghana Laboratory of Sciences and Technology for Water and Environment (LSTEE) University of Abomey-Calavi (UAC) Cotonou Benin

Based on 2022 and 2023 hydrometric data and satellite images (Sentinel 2022, SPOT 2010), this study aims to present the Nok.ué Lak. and its channels’ re-cent hydromorphological characteristics. Integrating flow, tributary morphology, and topography data determined specific power values along the axes studied. The values obtained range from 2.69 to 12.92 W/m2 for Ouémé River and 2.46 to 10.99 W/m2 for Sô River. The resulting water erosion on bank. and bottoms is of linear, areolar, or gully and claw types. Lak. bathymetry varies from -0.5 to -2.6 m (low flow period) and -1 to -4 m;in the Ouémé, Sô, and Totchè rivers, it varies from -5 m to -7 m, reaching -10 m at the Cotonou channel entrance (flood period). Bathymetric profiles reveal varied “U”, “V” and “Intermediate” bottom morphologies, influenced by erosion/sedimentation processes and human activities. The flow facies identified are lentic in the northern tributaries and lotic in the Cotonou and Totchè canals. Spatial analysis identified nine (09) thematic classes. In 2022, the surface area of the water body has increased from 274 k.2 at low water to 280 k.2 at high water, whereas in 2010 (a recent year of exceptional flooding), the surface area was 270 k.2 at low water and 277 k.2 at high water. Significant changes in land use are observed between 2010 and 2022. The floodplain area decreased slightly, from 421 k.2 in 2010 (year of exceptional flooding) to 419 k.2 in 2022. The evolution of land use shows a progressive expansion of the urban environment to the detriment of the natural environment. In the medium to long term, this trend could threaten the hydromorphological balance and even the existence of this important lagoon ecosystem.

关键词： Nok.ué Lak. Ouémé River Sô River Cotonou Channel Hydromorphology

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