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5. Conclusion – Outlook
The qualitative and quantitative characterization of grey water, and its comparison with other types of domestic wastewater, have shown the value of recycling grey water produced in bathrooms. Indeed, among the wastewater produced in the home, this water is the least contaminated, both in terms of organic pollutant load (COD ≍ 370 mg O 2 · L –1 ; BOD 5 ≍ 190 mg O 2 · L –1 ) and microbiological (there are around 550 CFU/100 mL of enterococci and fecal coliforms in this graywater).
What's more, the reuse of bathroom grey water would provide around 45 L of water per person per day for non-potable uses, which is roughly equivalent to the volume...
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Conclusion – Outlook
Bibliography
- (1) - AQUASTAT - Système d'information de l'Organisation des Nations Unies pour l'alimentation et l'agriculture accédé le 02/05/2010 http://www.fao.org/nr/water/aquastat/data/query/index.html .
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Standards and norms
Afnor (French standardization association)
- Sludge characterization – Determination of dry matter and water content - NF EN 12880 - 2000
- Wastewater treatment – Vocabulary - NF EN 1085 - 2007
International Organization for Standardization
- Water quality – Determination of suspended solids by glass fiber filtration - ISO 11923 - 1997
- Eau, qualité, essai des eaux, demande chimique...
Websites
WHO (World Health Organization)
WHO Guidelines for drinking-water quality http://www.who.int/water_sanitation_health , 3rd edition, 2006
Regulations
Law 2006-1772, law on water and aquatic environments – Journal officiel de la République française of December 31, 2006, corrigendum JORF of January 20, 2007 and law 2010-788 of July 12, 2010.
Arrêté du 21 août 2008 relatif à la récupération des eaux de pluie et à leur usage à l'intérieur et à l'extérieur des bâtiments, Journal officiel de la République française du 29 août 2008.
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