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detention time
the time allowed for solids to collect in a settling tank. Theoretically detention time is equal to the volume of the tank divided by the flow rate.
 
dew point
the temperature at which the condensation of a vapor begins; the term is usually applied to condensation of moisture from the water vapor in the atmosphere.
 
dialysis
the separation of a colloid from a substance in solution by allowing the solution to diffuse through a semipermeable membrane.
 
digestion
the biochemical decomposition of organic matter which results in the formation of mineral compounds and simple organic compounds.
 
diode
a component that readily passes current in one direction but opposes current flow in the opposite direction.
 
direct current (dc)
a non-oscillating current that flows continually in one direction through a circuit
 
disinfection
effective killing by chemical or physical processes of all organisms capable of causing infectious disease. Chlorination is the disinfection method commonly employed in sewage-treatment processes.
 

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