Sok fajtája létezik, itt valószínűleg a stabilization pond lehet a jó megoldás, mivel szűrés (filtration) után használják. Összefoglaló néven ezeket wastewater treatment pond-nak hívják.

"WASTEWATER TREATMENT PONDS
A wastewater stabilization pond is a relatively shallow body of wastewater contained in an earthen basin which is designed to treat wastewater. (“Oxidation pond" is a synonymous term.) They are used to treat a variety of wastewaters, from domestic wastewater to complex industrial waters, and they function under a wide range of weather conditions, i.e., tropical to arctic. Ponds can be used alone or in combination with other treatment processes.

Types of ponds.
Table 14-1 presents the many different ways that stabilization ponds may be classified. The bases for the classifications are type of influent, method of effluent flow management, oxygenation method, and type of biological activity. This last classification scheme is the best because it describes the dominant feature, i.e., the type(s) of biological activity occurring in a pond. However; to fully describe the different types of ponds, the effluent flow management method should also be noted."
http://www.discountpdh.com/course/domestic/Domestic Wastewat...

"Wastewater stabilization ponds
A recent World Bank Report (Shuval et al. 1986) came out strongly in favour of stabilization ponds as the most suitable wastewater treatment system for effluent use in agriculture. Table 15 provides a comparison of the advantages and disadvantages of ponds with those of high-rate biological wastewater treatment processes. Stabilization ponds are the preferred wastewater treatment process in developing countries, where land is often available at reasonable opportunity cost and skilled labour is in short supply."
http://www.fao.org/docrep/t0551e/t0551e05.htm#3.3.1 wastewat...

"Hydraulic Characteristics of a Wastewater Treatment Pond"
http://www.pjoes.com/pdf/15.1/105-110.pdf

"Wastewater Treatment (Stabilization) Ponds"
http://nepis.epa.gov/Exe/ZyNET.exe/00000I91.TXT?ZyActionD=Zy...

A "medence" angolul "basin" is lehet, pl.:
"Super Efficient Aerobic Wastewater Basin Aerator
The Oxygenator is used to efficiently provide aeration to an aerobic wastewater treatment basin. Conventional aerators utilize atmospheric air to dissolve oxygen into the water so that the microorganisms can consume the BOD in the wastewater.."
http://wecleanwater.com/html/equipment/the-oxygenator.htm

"Another design that is sometimes used is an aerated grit chamber. In am aerated grit chamber, air bubbles are injected into a wastewater basin to force a spiral, or rolling, flow. The air bubbles are supposed to strip organic material off the surfaces of the inert grit, and the grit settles in the bottom. (...)
To even out these periods of high and low flow, large basins are constructed at some wastewater treatment plants to store the wastewater flow from peak periods and release it for treatment. These basins require aeration and mixing to prevent odors and deposition of solids."
http://www.bcwater.org/waterfacts/wastewatertreatment.asp

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Note added at 2 hrs (2011-05-12 18:49:14 GMT)
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Bocsánat, figyelmetlen voltam... Ez esetben simán TREATMENT POND szerintem. :)

Ez a glosszárium talán jól fog jönni a munkában:
Glossary of Water Resource Terms (itt is a pond / basin fordul elő)
http://www.edwardsaquifer.net/glossary.html

Valamint ez a cikk - Water purification, Sources +treatment of water:
"Other mechanical and biological techniques
See also: Greywater and Ecological sanitation
In addition to the many techniques used in large-scale water treatment, several small-scale, less (or non)-polluting techniques are also being used to treat polluted water. These techniques include those based on mechanical and biological processes. An overview:
mechanical systems: sand filtration, lava filter systems and systems based on UV-radiation)
biological systems:
plant systems as constructed wetlands and treatment ponds..."
http://en.wikipedia.org/wiki/Water_purification