title: Coagulation-flocculation and ammoniacal stripping of leachates from municipal solid waste landfill.
abstract: The elimination of contamination in leachates from municipal solid waste landfill was studied by sedimentation. The purpose of this study was to evaluate the removal efficiency of turbidity, chemical oxygen demand (COD), suspended solids (SS) and ammonia nitrogen (NH(3)). First, by coagulation with aluminium sulphate like inorganic coagulant, and secondly by flocculation with anionic polyacrylamides in quick succession. The use of polyacrylamides after coagulation with Al(3+) showed a lower SS removal and slow filtration. Turbidity removal efficacy was over 60% if Al(3+) concentration was 190 mg/L. COD elimination by flocculation was 10 to 20% regardless of adding polyacrylamides. Finally, ammoniacal stripping is made in order to reduce the ammoniacal nitrogen concentration in the supernatant liquid obtained after coagulation with Al(3+). The most influential variable in ammoniacal stripping was the agitation time.
authors.affiliation: U.P.M.- E.T.S.I. Montes, Departamento de Ingeniería Forestal, 28040 Madrid, Spain. mariapaz.andres@upm.es
authors.forename: Paz
authors.initials: P
authors.lastname: Andrés
authors.forename: Arturo
authors.initials: A
authors.lastname: Díaz
authors.forename: Manuel
authors.initials: M
authors.lastname: Cortijo
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000534:Alum Compounds / Q000737:chemistry; D000641:Ammonia / Q000378:metabolism; D012037:Refuse Disposal / Q000379:methods*; D018505:Waste Management / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D000534:Alum Compounds; D000641:Ammonia; D014874:Water Pollutants, Chemical; D000099166:Polyacrylamides; C041524:aluminum sulfate