title: Ammonia removal from compost leachate using zeolite. III. Regeneration of zeolite columns.
abstract: The effects of hydraulic reteneration time (HRT), and the strength of the regenerating solution on the ammonia adsorption capacity and the zeolite regeneration were studied using bench-scale packed zeolite columns. A 0.6 M NaCl solution fed at a HRT of I h was preferred for the regeneration process, and more than 95% of adsorbed ammonium ions were recovered after using 7-8 bed volumes (BV) of the regenerating solution. The adsorption-regeneration time ratio was approximately 5:1. High concentration of potassium ions in the composting leachate competed with NH4+ ions for the exchange sites, resulting in a reduction in the efficiencies of ammonia removal and zeolite column regeneration. However, Zeolite still proved to have a great potential as a medium for ammonia removal in treating composting leachate.
authors.affiliation: Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, Canada.
authors.forename: C H
authors.initials: CH
authors.lastname: Liu
authors.forename: K V
authors.initials: KV
authors.lastname: Lo
mesh_terms: D000327:Adsorption; D000641:Ammonia / Q000737:chemistry*; D012037:Refuse Disposal; D014872:Water Movements; D014876:Water Pollution / Q000517:prevention & control; D017641:Zeolites / Q000737:chemistry*
chemical_list: D017641:Zeolites; D000641:Ammonia