DESIGN OF WASTEWATER STABILIZATION POND FOR THE UNIVERSITY OF MAIDUGURI

The objective of this study was to design a wastewater stabilization pond for the treatment of wastewater in the University of Maiduguri. Relevant design parameters viz: flow, Biochemical Oxygen Demand (BOD), faecal coli forms, temperature, permissible volumetric BOD loading, hydraulic retention time, particle size distribution, optimum moisture content, maximum dry density and saturated hydraulic conductivity of the soil were determined. The projected population of the design area is 48,590. The calculated BOD of the wastewater is 196 g/m3, since this value is greater than 25 g/m3, it has to be treated before discharge as specified by the Council for the European Communities. Permissible volumetric loading of 350 g/m3d corresponding to the designed temperature (31.8 0C) was used. The designed anaerobic pond volume and area are 8,778 m3 and 2,949 m2 respectively. The designed surface BOD loading and the hydraulic retention time for the facultative pond are 467 kg/ha/d and 4 days respectively. The effluent BOD of the maturation pond with an area of 23408 m2 is less than the 25 g/m3 maximum standard required by Council for the European Communities, thus it is safe. The quality of the final effluent in terms of BOD and faecal coliform (8.3 g/m3 and 16 FC/100ml) are within the World Health Organisation standard which indicates that the design is satisfactory to meet the specified objective.