Estudo da remoção de nitrogênio amoniacal por processo de arraste com ar (air stripping) em lixiviado de aterro sanitário

• Ano de defesa: 2011
• Autor(a) principal: Bastos, Felipe Azevedo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Engenharia Ambiental; Centro Tecnológico; UFES; Programa de Pós-Graduação em Engenharia Ambiental
• Palavras-chave em Português: Air stripping; Leachate; Ammonia removal; Landfill; Lixiviado; Remoção de amônia; Aterro sanitário; Aterro sanitário - Lixiviação; Engenharia Sanitária; 628
• Link de acesso: http://repositorio.ufes.br/handle/10/10250

The landfill leachate has high pollution potential, with high concentrations of chlorides, COD and ammonia nitrogen. His treatment process is very complex and usually involves different technologies. Because of its effectiveness, the stripping is a widely used treatment for the removal of NH3 leachate. This research focused on the process of air stripping to remove ammonia in leachate from landfills, considering the influence of different pH and air flow in order to pre-treatment. Moreover, addressed the relationship between the removal of ammonia nitrogen and total alkalinity. To perform the experimental part, tests were conducted with 1 L of leachate, using stripping towers with 90 cm high and 10 cm internal diameter, at ambient temperature and batch time of 4 h. The experiment was divided into two stages. The Phase I, aimed to target methodologically the experimental procedure. Phase II, was designed from the knowledge obtained in Phase I. The results showed removal efficiencies of 56%, 72% and 83% for air flow 2 NL.L-1.min- , 5 NL.L-1.min-1 and 10 NL.L-1.min-1 respectively. With the changes in the natural pH, pH 10, 11 and 12, were obtained an average difference of 6% between the tests, while the highest average efficiency was 75% for pH 12.It was concluded that an air flow rate of 5 NL.L-1.min-1 was thought as suitable for engineering application, as well as the pH 10 that had similar efficiencies to higher levels of pH.