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Schematic of a septic tank [2] Septic tank and septic drain field 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 .
If there is a suitable septic tank in place, pumping the effluent from the tank is the lowest cost option for initial costs. Whether the septic tank is the lowest cost option over time depends on the cost of electricity in the area, how often the tank must be emptied and how much it costs to have the solids pumped out of the tank.
The relatively grease-free water is then fed into the normal septic system.The food solids at the bottom and floating oil and grease must be periodically removed in a manner similar to septic tank pumping. [11] A traditional grease trap is not a food disposal unit. Unfinished food must be scraped into the garbage or food recycling bin.
For activated sludge treatment plants in the United States, around 30 percent of the annual operating costs is usually required for energy. [7]: 1703 Most of this electricity is used for aeration, pumping systems and equipment for the dewatering and drying of sewage sludge. Advanced sewage treatment plants, e.g. for nutrient removal, require ...
Commercial vacuum trucks which collect fecal sludge usually have a volume of 10–55 cubic metres (350–1,940 cu ft). [1] However various smaller versions for specialized applications or low-resource settings can be found with tanks as small as 500 litres (110 imp gal; 130 US gal).
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