- under-gravel filter
Dictionary of ichthyology. 2009.
under-gravel filter
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Trickling filter — A trickling filter consists of a fixed bed of rocks, gravel, slag, polyurethane foam, sphagnum peat moss, or plastic media over which sewage or other wastewater flows downward and causes a layer or film of microbial slime to grow, covering the… … Wikipedia
Slow sand filter — Slow sand filters are used in water purification for treating raw water to produce a potable product. They are typically 1 to 2 metres deep, can be rectangular or cylindrical in cross section and are used primarily to treat surface water. The… … Wikipedia
Media filter — Peat Sand Filter in United States. The filter treats stormwater runoff from a residential area. Stormwater from streets is first routed to a small detention basin (rear of photo, behind berm), which removes coarse sediment. After filtration an… … Wikipedia
undergravel filter — a form of aquarium filter consisting of a perforated plate placed under the gravel on the bottom of the aquarium. The plate has several uplift tubes terminating at or near the water surface. The substrate acts as the filter bed as water is drawn… … Dictionary of ichthyology
air pump — a pump which supplies air for airstones, lift tubes, under gravel filters, skimmers, bubblers, ornamental items and other devices in an aquarium. The air bubbles serve to draw water through an under gravel filter for example. The most common type … Dictionary of ichthyology
Hydroponics — (from the Greek words hydro (water) and ponos (labour) is a method of growing plants using mineral nutrient solutions, without soil. Terrestrial plants may be grown with their roots in the mineral nutrient solution only or in an inert medium,… … Wikipedia
Devils Lake (North Dakota) — For other uses, see Devils Lake (disambiguation). Devils Lake View from space (March 2009) Location Ramsey / Benson counties, North Dakota, USA … Wikipedia
Devil's Lake (North Dakota) — Infobox lake lake name = Devil s Lake image lake = devils lake nd.jpg caption lake = View from space, October 1985 image bathymetry = caption bathymetry = location = North Dakota coords = type = inflow = outflow = catchment = 3,810 mi² (9,870… … Wikipedia
Constructed wetland — Vertical Flow type of Constructed Wetlands A constructed wetland or wetpark is an artificial wetland, marsh or swamp created as a new or restored habitat for native and migratory wildlife, for anthropogenic discharge such as wastewater,… … Wikipedia
environmental works — ▪ civil engineering Introduction infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations … Universalium
