title: Nitrogen removal in leachate using carrousel activated sludge treatment process.
abstract: This paper presents the application of Carrousel Activated Sludge Treatment Process (CASTP) for ammonium nitrogen removal. High concentrations of ammonium nitrogen were found in landfill leachate. When leachate is treated in a local wastewater treatment plant, it has the potential to disturb the operations in the wastewater treatment plant. Because of the advantages of Carrousel Activated Sludge Treatment Process, several pilot studies and kinetic reactions of ammonium nitrogen removal in the CASTP were studied. High circulation and low dissolved oxygen in the CASTP enhances nitrification and denitrification processes. The results indicated that approximately 50-85% ammonium nitrogen and nitrate nitrogen were removed by using a conventional CASTP process. Two key parameters in the CASTP were further studied. The system detention time (SDT) appeared more important than the sludge retention time (SRT) in the CASTP. According to the experimental data, 24 h of the system detention time and 25 days of the sludge retention time achieved 85% or more ammonium nitrogen removal.
authors.affiliation: Department of Civil and Environmental Engineering, Christian Brothers University, Memphis, Tennessee, USA. llin@cbu.edu
authors.forename: L Yu
authors.initials: LY
authors.lastname: Lin
authors.forename: Jy-Gau
authors.initials: JG
authors.lastname: Sah
mesh_terms: D004867:Equipment Design; D009584:Nitrogen / Q000032:analysis* / Q000737:chemistry; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000032:analysis / Q000737:chemistry; D012722:Sewage / Q000737:chemistry*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000644:Quaternary Ammonium Compounds; D012722:Sewage; D014874:Water Pollutants, Chemical; D009584:Nitrogen; D010100:Oxygen