The Comparision of the Characteristics of Water Quality in Alternative Aerobic-Anoxic and Aerobic Sludge Digestion

선택적인 Aerobic-Anoxic과 Aerobic 슬러지소화에서의 수질특성 비교

The objectives of this study were to compare the characteristics of water quality in alternative Aerobic-Anoxic(A/A) and Aerobic(Control) sludge digestion. The A/A process control parameter as the pH signal(dpH/dt) was used. Comparison of the result of A/A digestion with those of Aerobic digestion indicated a 54% saving in aeration compared to Aerobic digestion. TN removal efficiency rates of A/A and Aerobic digestion were 45% and 4%, respectively. The concentration of COD(64 mg/l and 268 mg/l for the A/A and Aerobic digestion, respectively) and Ortho-P in the supernatant were also less with A/A digestion. MLVSS and Coliform destructions were noticed similar for both digestion, but better dewatering charateristics were noted for the A/A digestion.