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A septic tank is an underground chamber made of concrete, fiberglass, or plastic through which domestic wastewater flows for basic sewage treatment. [2] Settling and anaerobic digestion processes reduce solids and organics, but the treatment efficiency is only moderate (referred to as "primary treatment"). [2]
A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
Spolia (Latin for 'spoils'; sg.: spolium) are stones taken from an old structure and repurposed for new construction or decorative purposes. It is the result of an ancient and widespread practice ( spoliation ) whereby stone that has been quarried, cut and used in a built structure is carried away to be used elsewhere.
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There is a window on the north wall. The room is paved with a simple screed floor. A septic tank occupies the western half of the room with a pit constructed of Sarno limestone with a depth of about 13 1/2 feet. Above the pit was a seat board, which left an imprint on the north wall at a height of about 16 inches above ground level. [28]
Effluent sewer systems, also called septic tank effluent gravity (STEG), solids-free sewer (SFS), or septic tank effluent drainage (STED) systems, have septic tanks that collect sewage from residences and businesses, and the liquid fraction of sewage that comes out of the tank is conveyed to a downstream receiving body such as either a ...
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