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A septic tank consists of one or more concrete or plastic tanks of between 4,500 and 7,500 litres (1,000 and 2,000 gallons); one end is connected to an inlet wastewater pipe and the other to a septic drain field. Generally these pipe connections are made with a T pipe, allowing liquid to enter and exit without disturbing any crust on the surface.
A septic drain field, a septic tank, and associated piping compose a septic system. The drain field typically consists of an arrangement of trenches containing perforated pipes and porous material (often gravel ) covered by a layer of soil to prevent animals (and surface runoff ) from reaching the wastewater distributed within those trenches. [ 1 ]
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 ...
Smaller tank trucks with a capacity under 11,000 litres (3,000 US gal; 2,500 imp gal) are typically used to deal with light liquid cargo within a local community. A common example is vacuum truck used to empty several septic tanks and then deliver the collected fecal sludge to a treatment site.
Norwescon grew out of the desire of its founders to host a Worldcon in Seattle in 1981. However, there was one major issue — at the time, most of Pacific Northwest fandom had little or no experience in running cons. Norwescon was therefore originally formed as an effort to get some practice for Worldcon.
Larger tanks are commonly used where there is no access to a centralised water supply. Companies recommend a 1,135 litres (300 US gal) tank for a house supporting two people (if compost toilets are placed) and if the region receives at least 762 mm (30.0 in) of precipitation a year. If it receives less (between 254–762 mm (10.0–30.0 in ...
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