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Journal of Applied Sciences
Year: 2005  |  Volume: 5  |  Issue: 7  |  Page No.: 1178 - 1181

An Overview of COD Load Removal at Glen Valley Reactivated Sludge Wastewater Treatment Plant

E. Nkegbe, S. Sankwasa, I. Koorapetse and I. Keikanetswe    

Abstract: The objectives of this study were to assess the Chemical Oxygen Demand (COD) load removal at the conventional aerobic and the anaerobic routes of the Gaborone City Council, Glen Valley wastewater treatment plant and to assess the efficiency of the various sections of the treatment process in COD load removal. The Gaborone City Council Wastewater Treatment Plant at Glen Valley combines both the conventional and the anaerobic systems of waste water treatment. The reactors have a total volume of 301874 m3 with anaerobic reactor volume of 189000 m3 inclusive. A total of 1711 tonnes of COD was removed monthly and 56.3 daily over a five month study period at the conventional aeration process unit whilst the Secondary Digester removed monthly 1.02 tons and 34 kg daily. Both reactors therefore removed 1712 tons of COD monthly and 57.2 tons daily. The performance of the anaerobic digesters in COD load removal was poor (3.5%) due to unfavourable pH, temperature and high volatile acid to total alkalinity ratios (poor buffering capacity) during the study period. For efficient performance from the digesters, the temperature, pH and the volatile acid to total alkalinity ratios must be rigidly monitored to generate the required environment for micro flora activity.

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