| Title |
Comparison of the Air and Oxygen Activated Sludge Systems for the Treatment of Dying Industrial Wastewater |
| Authors |
박영규 ; 이철희 ; 김우항 ( Yung Kyu Park ; Chul Hee Lee ; Woo Hang Kim ) |
| Abstract |
This study was conducted to evaluate the feasibility of dye industrial waste water treatment by oxygen activated sludge process in batch test. The treatment efficiencies of air activated sludge process and oxygen activated sludge process were compared in continuous bench-scale test. The treated effluent by oxygen activated sludge process was coagulated with alum. A six hour reaction time was required to reduce DOC from 748㎎/ℓ to 143㎎/1 with a MLSS concentration of 1660㎎/1 in oxygen activated sludge process, but total organic carbon particle(TOCp) increased 1.4 times after oxygen treatment. 95% and 93% of BOD were removed by oxygen activated sludge process that was operated in the F/M range of 0.44 to 1.12 and by air activated sludge process that was operated in the F/M range of 0.28 to 0.64, respectively. The oxygen process is capable to handle BOD loading 1.9 times greater than the air process. Also, the oxygen process was less sensitive to BOD loading and F/M ratio variation than the air process. The effluent of oxygen activated sludge process in the range 0.8-1.6(㎏ COD_(Mn)/㎥.day) was treated with 400㎎/ℓ of alum. It was observed that the combination of oxygen activated sludge process and alum coagulation resulted in effluent which contained below 100㎎/1 of COD-Mn. |