| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 101 === Among the waste organic solvent drain from semiconductor manufacturing processes, isopropyl alcohol (IPA) accounts for the most significant amount of the waste solvent. The waste solvent is usually treated by collecting them and then sent to a qualitifed contractor for treatment. To achieve an objective of reduction of organic solvent, this study was attempted to explore the potential of using the existing membrane biological reactor (MBR) for the treatment of biodegradable IPA. MBR process combines traditional biological acivated sludge and membrane technologies for treating wastewater. The source of wastewater for theMBR system is from restaurants, floor drains and septic tanks and the treated water is either discharged or recycled. Research was conducted employing the Quality control story (QC Story) procedure, including steps such as data collection, review of literatures, and verification. Chemical Oxygen Demand (COD) and mixed liquor suspended solids (MLSS) were adopted as the main parameters in this study .
During the experiment, 10 L to 100 L of IPA were in sequence added into the raw wastewater in collection tank. When 100 L of IPA was added, COD in the effluent exceeded the regulation level. However, if MLSS in the MBR system was reduced to around 20000 mg/L, the COD level in the effluent can be maintained under the regulation level. This study was conducted in the on-site MBR system in an semiconductor factory and demonstrated a possibility of using MBR system for treating IPA. Therefore, operation parameters obtained in this study may be as references for the industrial waste treatment.
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