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Ibrahima Barry, Aissatou Lamarana Bah, Boubacar Diallo and Baba diogo Diallo
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DOI:10.17265/2162-5263/2025.06.003
Higher Institute of Agronomy and Veterinary Medicine of Faranah, Faranah 131, Republic of Guinea
This study focuses on the evaluation of the ammonia (NH₃) stripping and the sizing of a sludge treatment plant, based on experimental results obtained at the station Sonfonia (Conakry, Guinea), based on the Heins-Coll model. The targeted physicochemical parameters are temperature, the pH and nitrogenous forms NH₃/NH₄⁺. The nitrogen stripping process is described using the Azov and Goldman mathematical model, which allows for the estimation of the concentration of stripped ammonia nitrogen (N-NH₃) as a function of temperature and pH. The methodology is based on sampling the liquid fraction at different levels of the station, followed by physicochemical analyses and a comparative interpretation of the results. The average results obtained for the period 2022-2023 at the plant inlet are as follows: temperature of 29.71 °C, pH of 7.74, and NH₃ concentration of 28.76 mg/L. These values show that the ammonia load of the incoming sludge is significantly lower than that considered in the initial design of the plant (142 mg/L). Monitoring the flow of the effluent through the four lagoons reveals a progressive decrease in concentrations, with average values of 29.66°C and pH of 7.66. And NH₃ of 16.91 mg/L, reflecting a significant purification performance of the lagoon system. Nitrogen stripping tests were conducted in 2023 at Lagoon 1, based on six observation points. The application of the Azov and Goldman model yielded the following results: temperature of 32.15 °C, pH of 9.62, NH₄⁺ of 37.82 mg/L, NH₃ of 29.83 mg/L, with an NH₃/NH₄⁺ ratio of 78.78%, confirming the determining influence of pH and temperature on the effectiveness of ammonia stripping. In conclusion, the analysis of the treatment performance of the Sonfonia sludge treatment plant highlights the relevance and robustness of the Azov and Goldman model, combined with the Heins-Coll model, for understanding nitrogen stripping mechanisms. The results obtained provide a reliable scientific basis for the optimization and design of new sludge treatment plants adapted to tropical climatic conditions.
Sewage sludge, characterization, flow path, lagooning, stripping, Sonfonia.
Ibrahima Barry, Aissatou Lamarana Bah, Boubacar Diallo and Baba diogo Diallo.Characterization of the Physical, Chemical, Organic and Biological Parameters of the Sewage Sludge from Sonfonia-conakry, Guinea.Journal of Environmental Science and Engineering B 14 (2025) 274-282 doi:10.17265/2162-5263/2025.06.003
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