Glossary E-F

Effluent Wastewater – treated or untreated that flows out of a treatment plant, sewer, or industrial outfall, generally refers to wastes discharged into surface waters.
Effluent based standards Standards which set concentration or mass per time limits on the effluent being discharged to a receiving water.
Effluent limitation
Restrictions established by a national environmental agency or by a subnational jurisdiction on quantities, rates and concentrations in wastewater discharges.
Emissions Pollution discharged into the atmosphere from smokestacks, other vents and surface areas of commercial or industrial facilities, from residential chimneys; and from motor vehicle, locomotive or aircraft exhausts.
Emissions factor The relationship between the amount of pollution produced and the amount of raw material processed.
Fixed solids (FS) Solids that do not volatilize at 550°C.
Fixed suspended solids (FSS) The matter remaining from the suspended solids analysis which will not burn at 550°C. It represents the non-filterable inorganic residue in a sample.
Flocculation The process by which clumps of solids in water or sewage are made to increase in size by biological or chemical action so that they can be separated from the water.
Flue gas Vented air coming out of a chimney after combustion in the burner; can include nitrogen oxides, carbon oxides, water vapor, sulfur oxides, particles and many chemical pollutants.

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