Efficiency Evaluation of a wastewater Treatment Plant by Activated Sludge

Performance of El-Agamyeen Plant for wastewater treatment (WWTP) by activated sludge was studied over a period of 20 weeks. Results showed that chemical oxygen demand; COD, biochemical oxygen demand; BOD, total suspended solids; TSS and ammonia decreased through stages of treatment process. The percentage removal of these parameters during studied period ranged 86-95, 91-96, 90-94 and 71-85 % respectively. Dissolved oxygen; DO in aeration tank was not less than 1.2 mg/L during study. Of microfauna, amoebae and flagellates appeared at low DO and high organic load, dominancy of crawling and stalked ciliates affected efficiency of treatment. Rotifers count ranged from 1.3x103 to 9x104 indicating good sludge quality.High toxicity could be obtained with the inlet wastewater and decreased with mixed liquor; the outlet water has been shown the least average toxic effects (<10% mortality) on the test organism. The results indicated that wastewater treatment in this Plant during the study period reduced pollution significantly and effluent water can be left for discharge into water bodies.