title: Ammonia removal from landfill leachate by air stripping and absorption.
abstract: An old landfill leachate was pre-treated in a pilot-scale aerated packed tower operated in batch mode for total ammoniacal nitrogen (TAN) removal. The stripped ammonia was recovered with a 0.4 mol L(-1) H2SO4 solution, deionized water and tap water. Ca(OH)2 (95% purity) or commercial hydrated lime was added to the raw leachate to adjust its pH to 11, causing removal of colour (82%) and heavy metals (70-90% for Zn, Fe and Mn). The 0.4 molL(-1) H2SO4 solution was able to neutralize 80% of the stripped ammonia removed from 12 L of leachate. The effectiveness of the neutralization of ammonia with deionized water was 75%. Treating 100 L of leachate, the air stripping tower removed 88% of TAN after 72 h of aeration, and 87% of the stripped ammonia was recovered in two 31 L pilot-scale absorption units filled with 20 L of tap water.
authors.affiliation: Department of Hydraulics and Sanitation, Escola de Engenharia de São Carlos, Universidade São Paulo, São Carlos, Brazil. fernanda.m.ferraz@gmail.com
authors.forename: Fernanda M
authors.initials: FM
authors.lastname: Ferraz
authors.affiliation: Department of Hydraulics and Sanitation, Escola de Engenharia de São Carlos, Universidade São Paulo, São Carlos, Brazil.
authors.forename: Jurandyr
authors.initials: J
authors.lastname: Povinelli
authors.affiliation: Sao Carlos Chemistry Institute, Universidade de São Paulo, São Carlos, Brazil.
authors.forename: Eny Maria
authors.initials: EM
authors.lastname: Vieira
mesh_terms: D000042:Absorption; D000388:Air; D000641:Ammonia / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D002126:Calcium Hydroxide / Q000737:chemistry; D052918:Environmental Restoration and Remediation / Q000295:instrumentation* / Q000379:methods*; D006862:Hydrogen Sulfide; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D000641:Ammonia; D002126:Calcium Hydroxide; D006862:Hydrogen Sulfide