title: In situ nitrogen removal from leachate by bioreactor landfill with limited aeration.
abstract: The feasibility of simultaneous nitrification and denitrification in a bioreactor landfill with limited aeration was assessed. Three column reactors, simulating bioreactor landfill operations under anaerobic condition (as reference), intermittent forced aeration and enhanced natural aeration were hence established, where aerated columns passed through two phases, i.e., fresh landfill and well-decomposed landfill. The experimental results show that limited aeration decreased nitrogen loadings of leachate distinctly in the fresh landfill. In the well-decomposed landfill, the NH(4)(+)-N of the input leachate could be nitrified completely in the aerated landfill columns. The nitrifying loadings of the column cross section reached 7.9 g N/m(2)d and 16.9 g N/m(2)d in the simulated landfill columns of intermittent forced aeration and enhanced natural aeration, respectively. The denitrification was influenced by oxygen distribution in the landfill column. Intermittent existence of oxygen in the landfill with the intermittent forced aeration was favorable to denitrify the NO(2)(-)-N and NO(3)(-)-N, indicated by the high denitrification efficiency (>99%) under the condition of BOD(5)/TN of more than 5.4 in leachate; locally persistent existence of oxygen in the landfill with enhanced natural aeration could limit the denitrification, indicated by relatively low denitrification efficiency of about 75% even when the BOD(5)/TN in leachate had an average of 7.1.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
authors.forename: Li-Ming
authors.initials: LM
authors.lastname: Shao
authors.forename: Pin-Jing
authors.initials: PJ
authors.lastname: He
authors.forename: Guo-Jian
authors.initials: GJ
authors.lastname: Li
mesh_terms: D000332:Aerobiosis; D000641:Ammonia / Q000737:chemistry / Q000378:metabolism; D019149:Bioreactors; D009566:Nitrates; D009584:Nitrogen / Q000737:chemistry* / Q000378:metabolism; D010100:Oxygen; D012037:Refuse Disposal; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D009566:Nitrates; D014874:Water Pollutants, Chemical; D000641:Ammonia; D009584:Nitrogen; D010100:Oxygen