ABSTRACT
O&M Operation and maintenance. O/W Oil-in-water emulsion. O2 Minimizer® Process controller used to control oxygenation of mixed liquor by
Schreiber Corp. OASES® Oxygen-activated sludge wastewater process by USFilter/Krüger. oasis A fertile or green vegetated area in a desert or wasteland that is supplied
with water. OB/OD Open pit burning/open detonation. obligate aerobes Bacteria that can survive only in the presence of dissolved oxygen. obligate anaerobes Bacteria that can survive only in the absence of dissolved
oxygen. obligate pathogen A pathogen that is unable to live outside a living host. OBS® Turbidity sensors by D&A Instrument Co. OCA 19™ Odor neutralizer by Hinsilblon Laboratories. OCC Old corrugated containers. occlusion An absorption process where one solid material adheres to another,
sometimes resulting in coprecipitation. Occupational Safety and Health Administration (OSHA) A U.S . agency
responsible for overseeing workplace health and safety. ocean The volume of salt water that covers approximately 71% of the earth’s
surface and is divided into five principal geographic regions: the Antarctic, Arctic, Atlantic, Indian, and Pacific.
