Nitrogen dynamics and removal by algal turf scrubber under high ammonia and organic matter loading in a recirculating aquaculture system

High total ammonia nitrogen (TAN) concentrations were introduced to an Algal Turf Scrubber developed under loadings of Clarius gariepinus recirculating aquaculture system effluent to determine its potential and dynamics of TAN removal. TAN removal rates were not affected at total suspended solids concentration of up to 0.04g TSS/l (P > 0.05). TAN removal rates 0.93-0.99g TAN/m²/d were recorded at loading rates between 3.76 and 3.81 g TAN/m²/d. TAN removal exhibited ½ order kinetics between 1.6 to 2.3mg/l TAN concentrations. TAN removal increased with TAN loading and hydraulic surface loading. In addition, TAN removal was higher than in fluidized bed and trickling filters.
Des concentrations élevées en azote d’ammoniaque total (TAN) ont été introduites à un épurateur de gazon d’algues développé sous des chargements de Clarius gariepinus recyclant l’effluent de système d’aquiculture pour déterminer son potentiel et dynamique de la suppression du TAN. Des taux d’élimination du TAN n’ont pas été affectés à la concentration des solides totaux suspendus jusqu’à 0.04g TSS/ l (P > 0.05). Les taux de suppression du TAN 0.93-0.99g TAN/ m2/d ont été enregistrés aux taux de chargement situés entre 3.76 et 3.81g TAN/m ² /d. Le déplacement duTAN a montré la cinétique d’ordre de ½ entre 1.6 et 2.3mg/l des concentrations de TAN. Le déplacement de TAN a augmenté avec le chargementde de TAN et le chargement de surface hydraulique. En outre, le déplacement du TAN était plus haut que dans le lit fluidisé et les filtres d’écoulement.
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Region Focus: 
Southern Africa
RUFORUM Conferences and Workshops
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Open Access
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Printed resource

About the RUFORUM 2010 Biennal Conference
"The 2010 RUFORUM Biennial Conference was the second in the series. The main objective of the Biennial conferences is to provide a platform for agricultural research for development stakeholders in Africa and beyond to actively exchange findings and experiences, while at the same time learning lessons towards improving performance of the agricultural sector and ultimately people’s livelihoods. The biennial conference is RUFORUM’s most comprehensive meeting for the diversity of stakeholders in agriculture. It is especially dedicated to graduate students and their supervisors, grantees in RUFORUM member universities and alumni. It is a platform for peer review, quality control, mentorship, networking and shared learning. This record contains an extended abstract accepted under the theme of Aqua Culture and Fisheries"