title: Grey water treatment by the slanted soil system with unsorted soil media.
abstract: This study evaluated the performance of unsorted soil media in the slanted soil treatment system, in terms of removal efficiency in suspended solids (SS), chemical oxygen demand (COD), linear alkylbenzene sulphonate (LAS) and Escherichia coli, and lifetime until clogging occurs. Unsorted soil performed longer lifetime until clogging than sorted fine soil. Removal of SS, COD, and LAS also performed same or better level in unsorted soil than fine soil. As reaction coefficients of COD and LAS were described as a function of the hydraulic loading rate, we can design a slanted soil system according to the expected hydraulic loading rate and the targeted level of COD or LAS in effluent. Regarding bacteria removal, unsorted soil performed sufficient reduction of E. coli for 5 weeks; however, the removal process occurred throughout all four chambers, while that of fine soil occurred in one to two chambers.
authors: a Graduated School of Engineering , Hokkaido University , Kita 13, Nishi 8, Kita-ku, Sapporo , Hokkaido 060-8628 , Japan.
authors: Ken
authors: K
authors: Ushijima
authors: Erina
authors: E
authors: Tanaka
authors: Laís Yuko
authors: LY
authors: Suzuki
authors: Nowaki
authors: N
authors: Hijikata
authors: Naoyuki
authors: N
authors: Funamizu
authors: Ryusei
authors: R
authors: Ito
mesh_terms: D017738:Alkanesulfonic Acids / Q000737:chemistry; D004926:Escherichia coli; D012987:Soil; D062065:Wastewater / Q000032:analysis* / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D017738:Alkanesulfonic Acids; D012987:Soil; D062065:Wastewater; C030641:alkylbenzyl sulfonic acid
keywords: E. coli; LAS; clogging; irrigation; water reuse