===Aqua privy===
[[Image:Aqua_privyss.PNG|thumb|right|200px|[[Aqua privy |Aqua privy]]]]
===Adequacy===
A Septic Tank is appropriate where there is a way of dispersing or transporting the effluent. Because the Septic Tank must be desludged regularly, a vacuum truck should be able to access the location. Often Septic Tanks are installed in the home, under the kitchen or bathroom which makes emptying difficult. If Septic Tanks are used in densely populated areas, on-site infiltration should not be used otherwise the ground will become oversaturated and excreta may rise up to the surface posing a serious health risk. Instead, the Septic Tank should be connected to a sewer and the effluent should be transported to a subsequent treatment or disposal site. Larger, multi-chamber Septic Tanks can be designed for groups of houses and/or public buildings (i.e. schools). Generally, the removal of 50% of solids, 30 to 40 % of biochemical oxygen demand (BOD) and a 1-log removal of E.coli can be expected in a well designed Septic Tank although efficiencies vary greatly depending on operation and maintenance and climactic conditions.
===Health Aspects/Acceptance===
Although the removal of pathogens is not high, the entire tank is below the surface so users do not come in contact with any of the wastewater. Users should be careful when opening the tank because noxious and flammable gases may be released. Septic Tanks should have a vent. A vacuum truck should be used to empty the sludge from the Septic Tank. Users should not attempt to empty the pit themselves except with a manual technology like the [[Human-Powered Emptying and Transport|Gulper]].
===Upgrading===
A Septic Tank that is connected to a [[Leach Field]] or a [[Soak Pit]] can later be connected to a [[Solids-free Sewer]] if/when one is installed.
===Maintenance===
Septic Tanks should be checked to ensure that they are watertight and the levels of the scum and sludge should be monitored to ensure that the tank is functioning well. Because of the delicate ecology, care should be taken not to discharge harsh chemicals into the Septic Tank. The sludge should be removed annually using a vacuum truck to ensure proper functioning of the Septic Tank.
Septic Tanks should be checked to ensure that they are watertight ===Field experiences==={| style="width: 70%; text-align: justify; background-color: #f5f5f5;"|[[Image:rsr 790.jpg|thumb|none|200px|<font size="2"><center>Project 790</center></font>|link=http://wandelenvoorwater2014.akvoapp.org/en/project/790/]]|'''Akvo RSR Project:''' [http://wandelenvoorwater2014.akvoapp.org/en/project/790/ WaSH program in Rural Bangladesh]Considering the unhealthy and unhygenic environment in rural school and the levels community in southern part of the scum Bangladesh, PSTC will initiate WaSH for schools and communities. lt ensures drinking water and sanitation both in school and community by installing hardware in selected school and sludge should be monitored to ensure that the tank is functioning wellareas. Because of the delicate ecologyIn addition, care should be taken not to discharge harsh chemicals into the Septic Tank. The sludge should be removed annually using a vacuum truck to ensure proper functioning of the Septic Tankhygiene promotion is done through group meeting/courtyard meeting in school and community.|}
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===Manuals, videos, and links===
This [http://www.lifewater.org/resources/san1/san1d4.pdf document] lists the specifications that need to be met for a succesful Aqua Privy.
===References===
Detailed Design Information:
* Mara, DD. (1996). [http://books.google.com/books/about/Low_cost_urban_sanitation.html?id=WOgeAQAAIAAJ Low-Cost Urban Sanitation]. Wiley, Chichester, UK. Sizing, volume and emptying calculations and example design solutions, Chapter 6.