| Title |
The Characteristics of Dyeing Wastewater Treatment by the Activated Sludge Process combined with Membrane |
| Authors |
황규대(Gye Dae Whang),소용신(Yong Sin So),조영무(Young Mu Cho) |
| Abstract |
The dyeing wastewater contains considerable amounts of hardly biodegradable substances such as volatile organic compounds, surfactants, dyes, sizing agents. This work was carried out to investigate the feasibility and effectiveness of the MBR(Membrane Bio Reactor) process for treatment of dyeing wastewater. Ceramic membrane with pore size of 0.l ㎛ was selected due to the convenience of backwashing and higher flux. For 90 days operation of MBR, MLSS concentration in the bioreactor was increased from 4000㎎/L to 19,500㎎/L. At the beginning the permeation flux was about 45L/㎡-hr and reduced to 5.7L/㎡-hr after 90 days of operation. The permeation flux was recovered by backwashing at the beginning of operation, but, after long-term operation, permeate flux was not favorably recovered by backwashing only. Some elements such as Al, Si, Na, Cl, Fe, Sn and Cr which were mostly originated from influent might contribute membrane fouling. The removal efficiencies of SCOD_(cr) and color of MBR were 78.6% and 34.4% respectively. Despite of the increased MLSS concentration, removal efficiency of organic matters and color density was not significantly improved because microorganism which could utilize the organic matters did not fully developed. Thus in order to enhance the removal efficiency of MBR process, MLSS concentration in bioreactor is to be maintained in the range of 4000∼6000㎎/L and PACAS(Powdered Activated Carbon Activated Sludge) process is recommended. |