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Absorption Trench:
Excavation in fill or soil, being an ingredient of a leaching bed where a
distribution pipe will be or is placed, which allows permeation of the
effluent into the fill or soil.
Distribution Pipe:
A sequence of perforated pipe installed in a leaching bed for the intention
of distributing effluent from a septic tank or secondary treatment unit to
the soil or fill in a leaching bed.
Effluent:
Liquid which flows away from a containing space, such as a septic tank.
Sanitary sewage that is passed through a treatment unit.
Greywater:
Wastewater from showers, laundry, and kitchen sinks, excluding toilet
wastes.
Holding Tank:
A tank designed for the total retention of all sewage released into it and
needing intermittent discharging by a hauled sewage system.
Leaching Bed:
The absorption system constructed as absorption trenches or as a filter bed,
located in ground or raised above ground as required by local conditions, to
which effluent from a septic tank or secondary treatment unit is applied for
treatment and disposal.
Leaching:
A process of draining of soluble salts, alkali and other constituents from
soils or other media by natural percolation or abundant irrigation.
Portable Privy:
A transportable latrine in which the receptacle for human body waste and the
superstructure are connected structurally into one component.
Raw Sewage:
Untreated wastewater.
Scum:
Oils and greases and other material that will float forming a deposit on the
top of the sewage.
Septic tank:
A watertight vault in which sewage is accumulated with the intention of
extracting scum, grease, and solids from the liquid without the addition of
air and anaerobic digestion of the sewage being established.
Sludge:
The gathered settled solids accumulated from sewage or industrial refuse,
treated or raw, in tanks or basins, and comprising more or less water to
build a semi-liquid accumulation.
Tertiary Treatment:
Any type of water upgrade that improves treated wastewater to meet reuse
requirements. This may include general cleanup of water, or elimination or
certain parts of wastes inadequately removed by conventional treatment
processes. The standard process would include chemical remedies and pressure
filtration.
Topsoil Layer:
Fertile dark coloured surface soil that supports growth.
Vault Privy:
A latrine in which the receptacle for the human waste consists of an
assembled vault from which the refuse is intermittently extracted.
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