API separators are one way to remove gross quantities of oil and suspended solids from refinery wastewater prior to subsequent downstream wastewater treatment processes – normally a second oil/water separator polishing step and some form of advanced treatment for removal of dissolved organic compounds (typically biological treatment, though other treatment technologies have been used).

Siemens pioneered the development of the API separator through its Envirex products group years ago. Today we continue to provide oil-water separators and other technologies and services for removing oil from water and treating oil-laden wastewaters.