| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 103 === Membrane bioreactor (MBR) was applied for the treatment of domestic sewage from a semiconductor industry. For identifying possible operational factors on the treatment efficiency, research was conducted using QC Story (Quality Control Story) approach. Through the method, experimental data was collected without modifying the system under current operating conditions. Furthermore, the optimal operation parameters of system, developed by means of analysis and review of literatures, could improve the treated water to meet the regulation and the qualities required for water recovery usage.
Based on QC Story results, parameters that caused MBR system failure were identified as including the raw waste water qualities, the setting of reactor effluent water quality, and the sludge discharging period.
The result also showed that the hydraulic retention time of this system was comparatively lower than that of the general MBR systems. This caused an significant increasing of aged sludge. Therefore, discharging period of sludge was determined as the main strategy to improve system performance. To verify this assumption, sludge was discharged periodically every day. MLSS was controlled between 15000 to 20000 mg/L. Eventually, the optimum procedure for discharging sludge was developed as reference for bringing benefit to the system operation. The COD of the treated water was kept around 30 mg/L which could successfully meet the qualities of water recovery threshold
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