title: Re-evaluation and reconstruction of water purification system using soil. I. Assessment of soil as a sorbent of humic substances and phosphate ion.
abstract: The purpose of our study is to develop a treatment procedure for humic substances (HS hereafter) and phosphate ion in wastewater and environmental water by percolation of the water through a constructed soil layer at the hydraulic loading of a few metres per day. In the present work, batch sorption tests were conducted for more than 80 samples of soil, sludge, mineral and organic materials in order to find good sorbents for fulvic acid (FA hereafter) and phosphate ion. The results showed that the sorption of FA was high for some charcoal, and apatite and goethite minerals. Comparatively high sorption of FA was found for some Andosols and volcanic ash soil. Significant sorption of phosphate ion, on the other hand, was found for various types of soil, sludge from water treatment plants and some waste materials. The linear isotherm was obtained for the sorption of FA to a charcoal, apatite and goethite minerals, and Andosols.
authors.affiliation: Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan. fujikawa@rri.kyoto-u.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Fujikawa
authors.forename: T
authors.initials: T
authors.lastname: Hamasaki
authors.forename: M
authors.initials: M
authors.lastname: Sugahara
authors.forename: H
authors.initials: H
authors.lastname: Ozaki
authors.forename: G
authors.initials: G
authors.lastname: Prasai
authors.forename: T
authors.initials: T
authors.lastname: Yano
authors.forename: R
authors.initials: R
authors.lastname: Imada
authors.forename: Y
authors.initials: Y
authors.lastname: Tainaka
authors.forename: W
authors.initials: W
authors.lastname: Nakamura
authors.forename: F
authors.initials: F
authors.lastname: Haruki
mesh_terms: D000042:Absorption; D001578:Benzopyrans / Q000032:analysis; D002244:Carbon / Q000737:chemistry; D003031:Coal / Q000032:analysis; D005069:Evaluation Studies as Topic; D006812:Humic Substances / Q000032:analysis*; D058085:Iron Compounds / Q000737:chemistry; D008903:Minerals / Q000737:chemistry; D009930:Organic Chemicals; D010710:Phosphates / Q000032:analysis* / Q000737:chemistry; D012722:Sewage / Q000737:chemistry; D012987:Soil; D013816:Thermodynamics; D014873:Water Pollutants / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D001578:Benzopyrans; D003031:Coal; D006812:Humic Substances; D058085:Iron Compounds; D008903:Minerals; D009930:Organic Chemicals; D010710:Phosphates; D012722:Sewage; D012987:Soil; D014873:Water Pollutants; C094886:goethite; D002244:Carbon; C005023:fulvic acid