primary sewage treatment
41Trickling 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… …
42District of Columbia Water and Sewer Authority — The District of Columbia Water and Sewer Authority (DC Water) provides drinking water, sewage collection and wastewater treatment in Washington, D.C., USA. DC Water also provides wholesale wastewater treatment services to several adjoining… …
43Pollution — For the Fransisco Battiato album, see Pollution (album). For the Goodies episode, see Pollution (The Goodies). Air pollution from World War II weapon production in Alabama, 1942 …
44Greywater — An effective greywater treatment system used at Occupy Wall Street to water Zuccotti Park s plants, October 2011[1] Greywater is wastewater generated from domestic activities such as laundry, dishwashing, an …
45Moon Island (Massachusetts) — Moon Island is situated in Quincy Bay, in the middle of Boston Harbor, Massachusetts. All of the land on the island is owned by the City of Boston but the island is under the jurisdiction of Quincy, Massachusetts.[citation needed] It is also part …
46Victoria, British Columbia — For other uses, see Victoria (geographical disambiguation). This article is about the city of Victoria. For electoral districts with the name Victoria, or in the area of Greater Victoria, see Victoria (electoral districts). City of Victoria… …
47bacteria — bacterial, adj. bacterially, adv. /bak tear ee euh/, n.pl., sing. bacterium / tear ee euhm/. ubiquitous one celled organisms, spherical, spiral, or rod shaped and appearing singly or in chains, comprising the Schizomycota, a phylum of the kingdom …
48Plumbing drainage venting — A building s waste disposal system has two parts: the drainage system and the venting system. The drainage system, also called traps and drains, comprises pipes leading from various plumbing fixtures to the building drain (indoors) and then the… …
49San Diego–Tijuana — This article is about the international metropolitan region. For the cites of San Diego and Tijuana, see San Diego and Tijuana. Coordinates: 32°32′31.87″N 117°01′46.63″W / …
50Combined oral contraceptive pill — (COCP) Background Birth control type Hormonal First use ? …
