septic tank

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septic tank,

underground sedimentation tank in which sewage is retained for a short period while it is decomposed and purified by bacterial action. The organic matter in the sewage settles to the bottom of the tank, a film forms excluding atmospheric oxygen, and anaerobic bacteria attack the solid matter, causing it to disintegrate, liquefy, and give off gases. The gases are discharged from a vent and the liquids overflow through an outlet into a disposal field where they can leach into the soil. Here aerobic bacteria purify the liquid. The Imhoff septic tank, an improvement over the ordinary septic tank, is still used in the United States; it is a two-story structure with the upper compartment used for settling the sewage, the lower one for the anaerobic disintegration of sludge. A sloping floor enables solid material to slide to the lower compartment, where, since the sludge is separated from the material in the sedimentation compartment, the action is more rapid. A cesspool is a simpler underground structure that allows the liquids to leach directly into the soil while retaining the solids. The solids are not as efficiently decomposed as in a septic tank and more frequent cleaning is necessary. Also, as the effluent is likely to contain more coliform bacteria than that of a septic tank, cesspools pose a greater threat to water supplies. Septic tanks and cesspools are usually used in rural areas. For urban sewage-disposal systems, see seweragesewerage,
system for the removal and disposal of chiefly liquid wastes and of rainwater, which are collectively called sewage. The average person in the industrialized world produces between 60 and 140 gallons of sewage per day.
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Septic tank

A concrete or steel tank where sewage is partially reduced by bacterial action. The liquids from the tank flow into the ground through a tile bed.

Septic Tank

 

a tank for the treatment of small amounts (up to 25 cu m daily, less frequently, up to 50 cu m) of household sewage. A septic tank is an underground horizontal settling reservoir with one to three compartments, through which the sewage flows in sequential order. After preliminary treatment (clarification) in the septic tank, the sewage is subjected to biological purification in beds of underground filtration or in sand-gravel filters. Up to 90 percent of the suspended material is retained in a septic tank.

septic tank

[′sep·tik ‚taŋk]
(civil engineering)
A settling tank in which settled sludge is in immediate contact with sewage flowing through the tank while solids are decomposed by anaerobic bacterial action.

Septic tank

A single-story, watertight, on-site treatment system for domestic sewage, consisting of one or more compartments, in which the sanitary flow is detained to permit concurrent sedimentation and sludge digestion. The septic tank is constructed of materials not subject to decay, corrosion, or decomposition, such as precast concrete, reinforced concrete, concrete block, or reinforced resin and fiberglass. The tank must be structurally capable of supporting imposed soil and liquid loads. Septic tanks are used primarily for individual residences, isolated institutions, and commercial complexes such as schools, prisons, malls, fairgrounds, summer theaters, parks, or recreational facilities. Septic tanks have limited use in urban areas where sewers and municipal treatment plants exist. See Concrete, Reinforced concrete, Structural materials

Septic tanks do not treat sewage; they merely remove some solids and condition the sanitary flow so that it can be safely disposed of to a subsurface facility such as a tile field, leaching pools, or buried sand filter. The organic solids retained in the tank undergo a process of liquefaction and anaerobic decomposition by bacterial organisms. The clarified septic tank effluent is highly odorous, contains finely divided solids, and may contain enteric pathogenic organisms. The small amounts of gases produced by the anaerobic bacterial action are usually vented and dispersed to the atmosphere without noticeable odor or ill effects. See Sewage, Sewage treatment

septic tank

household septic tank, cross section
A watertight, covered receptacle designed and constructed to receive the discharge of sewage from a building sewer, separate solids from the liquid, digest organic matter and store digested solids through a period of detention, and allow the clarified liquids to discharge for final disposal.
References in periodicals archive ?
not even a single employer has been booked to date for engaging a septic tank worker even as new public toilets being built under the Swachh Bharat Abhiyan have spawned more septic tanks and sewers; paradoxically increasing the need for more manual scavengers and septic tank cleaners.
To learn more on the septic tank pumping and tank inspection services offered by Alberta Septic Systems, please contact their offices directly today or visit their business website at www.
There are some important differences between a cesspit and a septic tank.
He also claimed that a number of properties in the area were overcrowded after being turned into labour camps - which meant the septic tanks were unable to cope with the number of tenants.
The minister said budgetary constraints will have an impact on the amount of funding that will be made available for households carrying out works to upgrade septic tanks.
Following that, all we want is for people to maintain their septic tanks to a good standard to avoid unintentional pollution.
It claims there is strong evidence that poorly-maintained septic tanks are contributing to poor water quality in rivers, lakes and coastal waters and there is also a danger that pollution from septic tanks could contaminate private water supplies from wells, boreholes and springs.
The three sites represented poorly maintained tanks (not pumped in 15-20 years), highly maintained tanks (pumped within 2-3 years prior to study), and septic tanks that received an intermediate level of maintenance.
As of January 1, 2012, all septic tanks in the UK will need to be registered.
London, June 16 (ANI): French President Nicolas Sarkozy reportedly signed an order to remove the prefect of the region where Carla Bruni's parents own a chateau, after he failed to end a long-running dispute over a septic tank.
If the sources of contamination are determined to be leaking or poorly situated septic tanks, officials plan to get court orders, if necessary, to inspect underground tanks at the multimillion-dollar homes of some of the world's most famous people.
Billy Bowie provide a professional and efficient septic tank de-sludging service to all households with private septic tanks.