Improving the efficiency of aerobic biological treatment of domestic wastewater by using fixed culture media
1
Laboratory of Management and Water Treatment, Oran, Algeria.University of Sciences and Technology of Oran Mohamed Boudiaf.
2
Laboratoire de Gestion et de Traitement des Eaux, Oran, Algérie.Université des Sciences et de la Technologie d'Oran Mohamed Boudiaf.
3
1)Universiy Tahri Mohammed Bechar, Faculty of Technology, BP 417, 08000 Bechar, Algeria
2)University of Science and Technology Oran, Laboratory of Management and Water Treatment (LGTE)
These authors had equal contribution to this work
Corresponding author
BENDIDA ALI
1)Universiy Tahri Mohammed Bechar, Faculty of Technology, BP 417, 08000 Bechar, Algeria 2)University of Science and Technology Oran, Laboratory of Management and Water Treatment (LGTE)
1)Universiy Tahri Mohammed Bechar, Faculty of Technology, BP 417, 08000 Bechar, Algeria 2)University of Science and Technology Oran, Laboratory of Management and Water Treatment (LGTE)
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ABSTRACT
This study investigates the use of pozzolan, a volcanic slag, as a packing material in a fixed culture system for biological wastewater treatment. Experimental work was conducted to evaluate the performance of pozzolan in terms of removalofBOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand) and NH4+ under different substrate concentrations and bed heights.
The results reveal that pozzolan achieved BOD removal efficiencies of up to80% at a concentration of 1g/L with a 20 cm bed height, while COD degradation rates demonstrated a kinetic constant K of 0.080 min-1under the same conditions. At higher concentrations (1.5 g/L) and a 40 cm bed height, the performance was slightly reduced, with COD degradation exhibiting K=0.040min−1K = 0.040 min-1, likely due to substrate saturation effects. Comparatively, scoria showed lower efficiency, with kinetic constants ranging from 0.018 to0.065 min-1, highlighting the superior performance of pozzolan as a packing medium, NH4+
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