Pilot-scale membrane bioreactor treats produced water ///

An aerobic, submerged-filter membrane bioreactor was used to treat produced water from offshore oil reservoirs at up to 4.7 bpd. Despite the high salinity (2–5% total dissolved solids) and Chemical Oxygen Demand (COD, up to 50,000 mg/L), the produced water was effectively treated, with reductions of greater than 97% in COD, and greater than 99% for specific organic components such as aliphatic hydrocarbons, monoaromatic hydrocarbons, aliphatic acids, aromatic acids and Polycyclic Aromatic Hydrocarbons (PAHs). In general, metal removal during treatment was limited. Exceptions were iron, manganese and barium, of which more than 90% was removed.

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