ANALYSIS AND DESIGN OF TREATMENT FACILITY FOR WASTEWATER FROM BOY’S HOSTEL, NNAMDI AZIKIWE UNIVERSITY, AWKA USING WASTE STABILIZATION PONDS SYSTEM

DAVID FELIX OKALIWE (NAU/2016224007)

Abstract


This project work presents the analysis and design of treatment facility forwastewater from Boy’s Hostel, Nnamdi Azikiwe University, Awka using wastestabilization ponds system. The use of waste stabilization ponds to treat wastewater is an effective, low maintenance and low-cost method. Laboratory experiments were conducted in the Engineering Laboratory (water lab.) and Springboard Research Laboratory on parameters such as pH, dissolved solids, suspended solids, Bio-chemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) from which values were obtained for the design of the ponds: anaerobic, facultative and maturation. The ponds were designed on the basis of a flow of 875m3 /d. A design temperature of 250 centigrade was adopted for the operation of the ponds. The anaerobic pond was designed on the basis of volumetric loading, has a retention time of 1.03days which reduces the BODloading from 360mg/l in the influent to 108mg/l. The facultative pond was designed on the basis of surface volumetric loading, it has a retention time of 28.5 days and the influent BOD of 108mg/l reduces to 23mg/l and has an area of 25,000m2 . The maturation pond is designed according to Marias’ method (1974) for faecal removal. It has a retention time of 7 days for complete decomposition and faecal coliform reduces to 224.08fc/100ml.

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