Trenches containing coarse aggregate about distribution pipes permitting septic-tank effluent to seep into surrounding soil. Also known as disposal field.

Related Terms

OVERHEAD

Pertaining to fluid (gas or liquid) effluent from the top of a process vessel, such as a distillation column. See fixed cost.

EFFLUENT

The fluid leaving a component.

FILTRATION (BETA) RATIO

The ratio of the number of particles greater than a given size in the influent fluid to the number of particles greater than the same size in the effluent fluid.

BUILT-IN-DIRT

Material passed into the effluent stream composed of foreign materials incorporated into the filter medium.

BETA-RATIO (ß-RATIO)

The ratio of the number of particles greater than a given size in the influent fluid to the number of particles greater than the same size in the effluent fluid, under specified test conditions (see 'Multi-Pass Test').

MEDIA MIGRATION

Material passed into the effluent stream composed of the materials making up the filter medium.

ABSORPTION BED

A sizable pit containing coarse aggregate about a distribution pipe system; absorbs the effluent of a septic tank.

ACTIVATED SLUDGE

A semiliquid mass removed from the liquid flow of sewage and subjected to aeration and aerobic microbial action; the end product is dark to golden brown, partially decomposed, granular, and flocculent, and has an earthy odor when activated-sludge effluent fresh.

ACID-WATER POLLUTION

Industrial waste waters that are acidic; usually appears in effluent from the manufacture of chemicals, batteries, artificial and natural fiber, fermentation processes, and mining.

CARRY-OVER

Unwanted liquid or solid material carried by the overhead effluent from a fractionating column, absorber, or reaction vessel.

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