Efficiency Evaluation of Sewage/Wastewater Treatment Plant in Ogunu, Warri, Delta State

Physical, chemical and microbiological efficiency of Sewage/Wastewater Treatment Plant (STP) located in Ogunu, Warri, Delta State, was determined. This was done by studying the applied technology and comparing analyzed results of its influent and effluent with that of regulatory set limits of the Federal Ministry of Environment (FME), Department of Petroleum Resources (DPR) and World Health Organization (WHO). The result obtained from the samples collected from the influent of the Donparker Sewage Treatment Plant, showed that the Sewage/Wastewater quality was highly contaminated and the result of its Effluent showed that the Plant was very effective and efficient, because it was able to bring all the stated parameters to be within regulatory limits. The Result also showed that the influent was acidic while the effluent was approximately neutral. Comparison of the results of analysis of the parameters in the sewage/wastewater samples with the Federal Ministry of Environment (FME), Department of Petroleum Resources (DPR), and World Health organization (WHO) set limits revealed that pH and Dissolve Oxygen (DO) were below the regulatory limits for the influent but within the regulatory limits for the effluent. The Total Suspended Solid (TSS), Nitrate, Phosphate, Five day Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), Total Dissolved Solids (TDS), Turbidity, Oil & Grease, Total iron, Zinc, Conductivity and Feacal Coliform in the influent were far above the regulatory set limits but below the regulatory limits in the effluents after treatment. Also the result revealed that Lead, Mercury, Arsenic, cadmium, Nickel, Cooper, Chromium, Residual Chlorine and Temperature were below the regulatory limits both for the Influents and effluents. The treatment plant was able to satisfactorily reduce the highly polluted influent within the regulatory limits after treatment thus ensuring that the effluent was environmentally friendly. It was recommended that combined sewage treatment technology as used by the Donparker Sewage treatment Plant should be applied for the treatment of highly polluted Sewage/Wastewater for effectiveness.