July 1998

Special Report: Fluid Flow

Control cyanides at source

A refiner develops an action plan to reduce cyanide emissions from FCCU sour water streams

Urban, Z., Process Systems Enterprise Ltd.

Cyanides in fluid catalytic cracking unit (FCCU) wastewater represent a dual problem – cyanide-induced corrosion in process equipment and compliance with increasingly stringent wastewater discharge limits. Hence, effective control of cyanides provides economic and environmental incentives. In this case study, a small petroleum refinery was out of compliance with its NPDES permit with respect to cyanide. With a total cyanide discharge limit of 200 mg/l and typical effluent concentrations between 100 µg/l and 400 µg/l, the refinery needed an effective strategy to achieve consistent compliance. Also, the refinery was anticipating that the cyanide limits in its renewed NPDES p

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