title: Application of landfill treatment approaches for stabilization of municipal solid waste.
abstract: This research sought to compare the effectiveness of three landfill enhanced treatment approaches aimed at removing releasable carbon and nitrogen after anaerobic landfilling including flushing with clean water (FB 1), leachate recirculation with ex-situ treatment (FB 2), and leachate recirculation with ex-situ treatment and in-situ aeration (FB 3). After extensive treatment of the waste in the FB scenarios, the overall solids and biodegradable fraction were reduced relative to the mature anaerobically treated waste. In terms of the overall degradation, aeration did not provide any advantage over flushing and anaerobic treatment. Flushing was the most effective approach at removing biodegradable components (i.e. cellulose and hemicellulose). Leachate quality improved for all FBs but through different mechanisms. A significant reduction in ammonia-nitrogen occurred in FB 1 and 3 due to flushing and aeration, respectively. The reduction of chemical oxygen demand (COD) in FB 1 was primarily due to flushing. Conversely, the reduction in COD in FBs 2 and 3 was due to oxidation and precipitation during Fenton's Reagent treatment. A mass balance on carbon and nitrogen revealed that a significant fraction still remained in the waste despite the additional treatment provided. Carbon was primarily converted biologically to CH4 and CO2 in the FBs or removed during treatment using Fenton's Reagent. The nitrogen removal occurred through leaching or biological conversion. These results show that under extensive treatment the waste and leachate characteristics did meet published stability values. The minimum stability values achieved were through flushing although FB 2 and 3 were able to improve leachate quality and solid waste characteristics but not to the same extent as FB 1.
authors.affiliation: University of Central Florida, Civil, Environmental, and Construction Engineering, 12800 Pegasus Drive, ENG I Room 340, Orlando, FL 32816, United States. Electronic address: Stephanie.Bolyard@ucf.edu.
authors.forename: Stephanie C
authors.initials: SC
authors.lastname: Bolyard
authors.affiliation: University of Central Florida, Office of Research and Commercialization, 4365 Andromeda Loop N., MH 243, Orlando, FL 32816, United States.
authors.forename: Debra R
authors.initials: DR
authors.lastname: Reinhart
mesh_terms: D000693:Anaerobiosis; D057919:Biological Oxygen Demand Analysis; D009584:Nitrogen; D012037:Refuse Disposal / Q000379:methods; D062611:Solid Waste; D064091:Waste Disposal Facilities
chemical_list: D062611:Solid Waste; D009584:Nitrogen
keywords: Fenton’s Reagent; Nitrogen removal; Solid waste; Stability indicators; Sustainable landfilling; Waste stabilization