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DOI : ,    Vol.5, No.4, 67 ~ 74, 1997
Title
Enhancement of Existing Activated Sludge Process by Ultrafiltration for Oily Wastewater Treatment
이택순Taek Soon Lee,서규태Gyu Tae Seo,문병헌Byung Hyun Moon,최광수Kwang Soo Choi
Abstract
This paper focuses on enhancing an existing physico-chemical process followed by activated sludge process for treatment of oily wastewater from metal processing work in an automobile manufacturing plant. A hybrid membrane separation activated sludge system was investigated in this study as an alternative for stable treatment of the oily wastewater. From the biodegradability test, it was shown that dissolved organic matter in the wastewater could be effectively removed by biological process. SCODcr Removal efficiency was higher than 90% at more than 10 days HRT(SRT) and 75∼80% removal of N-hexane for oil substance. However, during the experiment, settling characteristic of biomass was deteriorated by extended retation time. Organic rejection by ultrafiltration membrane with MWCO 20,000 was around 15% in terms of SCODcr showing that the oily wastewater contains almost soluble organic matters with molecular weight less than 20,000. However the hybrid membrane separation activated sludge system could produce significantly high removal efficiency of more than 95% in treatment of the oily wastewater from both one stage and two stage chemical treatment. Consequently this membrane coupled activated sludge system could be obviously a stable alternative process of conventional physico-chemical and biological treatment.
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