February 2004

Columns

HP Water Management: Understanding refinery wastewater treatment basics – Part 2

Part 1 of this column (November 2003) discussed operational complexity, waste stream characterization and free oil removal. This part discusses unit operations for emulsified oil, biological treatment..

Huchler, L. A., MarTech Systems, Inc.

Part 1 of this column (November 2003) discussed operational complexity, waste stream characterization and free oil removal. This part discusses unit operations for emulsified oil, biological treatment, suspended and floating solids control, and sludge handling. Free oil removal. API (American Petroleum Institute) units remove readily settleable solids and free oil from wastewater by creating a low velocity reactor (horizontal wastewater velocity less than 1 ft/min [0.3 m/min]) allowing a skimming operation due to the density difference between oil and water. API units often accumulate sludge, making sludge handling and removal equipment such as rakes and bleed taps essential to minimiz

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