title: Evaluation of pH, alkalinity and temperature during air stripping process for ammonia removal from landfill leachate.
abstract: The objective of this research was to evaluate the air stripping technology for the removal of ammonia from landfill leachates. In this process, pH, temperature, airflow rate and operation time were investigated. Furthermore, the relationship between the leachate alkalinity and the ammonia removal efficiency during the process was studied. The leachate used in the tests was generated in the Gramacho Municipal Solid Waste Landfill (Rio de Janeiro State, Brazil). The best results were obtained with a temperature of 60(o)C, and they were independent of the pH value for 7 h of operation (the ammonia nitrogen removal was greater than 95%). A strong influence of the leachate alkalinity on the ammonia nitrogen removal was observed; as the alkalinity decreased, the ammonia concentration also decreased because of prior CO2 removal, which increased the pH and consequently favored the NH3 stripping. The air flow rate, in the values evaluated (73, 96 and 120 L air.h(-1).L(-1) of leachate), did not influence the results.
authors.affiliation: School of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. juacyara@eq.ufrj.br
authors.forename: Juacyara Carbonelli
authors.initials: JC
authors.lastname: Campos
authors.forename: Denise
authors.initials: D
authors.lastname: Moura
authors.forename: Ana Paula
authors.initials: AP
authors.lastname: Costa
authors.forename: Lidia
authors.initials: L
authors.lastname: Yokoyama
authors.forename: Fabiana Valeria da Fonseca
authors.initials: FV
authors.lastname: Araujo
authors.forename: Magali Christe
authors.initials: MC
authors.lastname: Cammarota
authors.forename: Luigi
authors.initials: L
authors.lastname: Cardillo
mesh_terms: D000388:Air; D000641:Ammonia / Q000737:chemistry*; D001938:Brazil; D002245:Carbon Dioxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D012037:Refuse Disposal / Q000379:methods*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; D002245:Carbon Dioxide; D000641:Ammonia