wastewater treatment
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GC: n

S: http://water.usgs.gov/edu/wuww.html (last access: 7 August 2015); FAO – http://www.fao.org/docrep/t0551e/t0551e05.htm (last access: 6 July 2015); EncBrit – http://global.britannica.com/technology/wastewater-treatment (last access: 7 August 2015).

N: 1. wastewater treatment, also called sewage treatment, the removal of impurities from wastewater, or sewage, before they reach aquifers or natural bodies of water such as rivers, lakes, estuaries, and oceans. Since pure water is not found in nature (i.e., outside chemical laboratories), any distinction between clean water and polluted water depends on the type and concentration of impurities found in the water as well as on its intended use. In broad terms, water is said to be polluted when it contains enough impurities to make it unfit for a particular use, such as drinking, swimming, or fishing.
2. The principal objective of wastewater treatment is generally to allow human and industrial effluents to be disposed of without danger to human health or unacceptable damage to the natural environment. Irrigation with wastewater is both disposal and utilization and indeed is an effective form of wastewater disposal (as in slow-rate land treatment). However, some degree of treatment must normally be provided to raw municipal wastewater before it can be used for agricultural or landscape irrigation or for aquaculture.

S: 1. EncBrit – http://global.britannica.com/technology/wastewater-treatment (last access: 7 August 2015). 2. FAOCDR – http://www.fao.org/docrep/t0551e/t0551e05.htm (last access: 15 October 2013)

GV: 1. waste-water treatment. 2. waste water treatment.

S: 1. CEC – http://goo.gl/czGxEI (last access: 15 October 2013). 2. GDT – http://www.granddictionnaire.com/ficheOqlf.aspx?Id_Fiche=8399273 (last access: 7 August 2015).

SYN: 1. purification of waste waters, effluent treatment, sewage treatment, purification of sewage, treatment of waste water, waste-water purification. 2. sewage treatment.

S: 1. GDT – http://www.granddictionnaire.com/ficheOqlf.aspx?Id_Fiche=8399273 (last access: 7 August 2015). 2. EncBrit – http://global.britannica.com/technology/wastewater-treatment (last access: 7 August 2015).

CR: clarification, flocculation.