Water and Wastewater Terms Beginning O

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O&M Manual
Obligate Aerobes
Obstruction
Occupational Safety and Health Act of 1970
Odor Panel
Odor Threshold
Off Line
Off Pounds
Offset
Offset Invert
Offset Joint
Offset Manhole
Offset Pipe
Offset Trough
Ohm
Olfactometer
Olfactory Fatigue
Oligotrophic
Operating Pressure Differential
Operating Ratio
Operator Interface
Organic
Organic Waste
Organics
Organism
Organizing
Orifice
ORP
Orthotolidine
OSHA
Osmosis
Ouch Principle
Outfall
Outfall Sewer
Outlet
Overall Efficiency, Pump
Overdraft
Overflow Manhole
Overflow Rate
Overflow Relief Line
Overhead
Overturn
Oxidation
Oxidation Ditch
Oxidation State/Oxidation Number
Oxidation-Reduction (Redox) Reaction
Oxidation-Reduction Potential
Oxidized Organics
Oxidizing Agent
Oxygen Deficiency
Oxygen Enrichment
Ozonation