title: Treatment of lower load graywater by using a controlled soil natural treatment system.
abstract: Experiences of treating graywater by soil natural treatment systems have not been widely reported. In general terms, graywater has a lower concentrations of organic matter; nutrients (e.g. nitrogen), and microorganisms than combined wastewater; therefore, the graywater treatment capacity of soil should be evaluated. In this study, the performance of a natural soil treatment system was evaluated when shower graywater from a house located at Sapporo City, Japan, was treated by a layer of 30 cm of soil from the Hokkaido University Campus. Results showed very high removal efficiencies of chemical oxygen demand (98%) and Kjeldahl nitrogen (95%) at high infiltration rates (214 cm/d), which denotes that natural soil treatment systems could be a good alternative to treat lower load graywater.
authors.affiliation: Centro de Estudios del Agua, Instituto Tecnológico y de Estudios Superiores Monterrey, Av. Eugenio Garza Sada Sur No. 2501, Col. Tecnológico, 64849 Monterrey, NL México. miganloza@itesm.mx
authors.forename: M A
authors.initials: MA
authors.lastname: López-Zavala
mesh_terms: D001673:Biodegradation, Environmental; D009584:Nitrogen / Q000302:isolation & purification; D009930:Organic Chemicals / Q000302:isolation & purification; D010100:Oxygen; D012987:Soil; D014867:Water / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D009930:Organic Chemicals; D012987:Soil; D014867:Water; D009584:Nitrogen; D010100:Oxygen