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Novel Pretreatment Enables Performance of MBR Installed to Treat Oily Wastewater

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Two new integrated systems processes, gas-energy-mixing (GEM) flotation - electrochemical catalytic oxidation (ECO) – membrane bioreactor (MBR) and ultra-filtration (UF) – ECO – MBR, were tested in industrial-scale pilots of 200L/h to 3000L/h for the treatment and reuse of steel mill cold-rolling emulsion wastewater. The operation parameters and mechanisms of each module action in the integrated process were analyzed. The influence of operation parameters of two processes on chemical oxygen demand (CODCr) and fats oil and grease (FOG) removal efficiency were comparatively investigated. The test results showed that the treated water quality could meet the requirement for reuse after treatment by either process. However, the quality of effluent treated by GEM – ECO – MBR was more stable than that of UF–ECO–MBR. Such system was more stable and economic to operate, and can therefore be used in various wastewater treatment plants used to remove emulsified oils and combination of non- and bio – degradable dissolved COD's.
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Keywords: Cold rolling emulsion wastewater; electrochemical catalytic oxidation (ECO); gas-energy-mixing (GEM); membrane bioreactor (MBR); ultrafiltration (UF)

Document Type: Research Article

Publication date: 01 January 2010

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