eTutorPhysics

fats (wastes)	triglyceride-esters of fatty acids. Erroneously used as synonymous with grease.

filter backwash	the reversal of flow though a filter to wash clogged material out of the filter medium and reduce conditions causing loss in flow through the filter.

filtration	the process of separating solids from a liquid by means of a porous substance through which only the liquid can pass.

flowrate	usually expressed as liters/minute (gallons/minute) or liters/day. Design flowrate is that used to size the wastewater treatment process. Peak flowrate is 1.5 to 2.5 times design and relates to the hydraulic flow limit and is specified for each plant.

fluid	a substance which yields readily to any force which tends to alter its shape; fluids possess no definite shape; the term includes both liquids and gases.

flux	a material used to promote joining of metals in soldering.

FNU	see formazin nephelometric unit.

formazin	a polymer suspension used as the standard for turbidity.

FTU	see formazin turbidity unit.

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