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 exsitu 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.
This research sought to compare the effectiveness of three landfill enhanced treatment approaches aimedat removing releasable carbon and nitrogen after anaerobic landfilling including flushing with cleanwater (FB 1), leachate recirculation with ex-situ treatment (FB 2), and leachate recirculation with exsitu 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 treatedwaste. In terms of the overall degradation, aeration did not provide any advantage over flushing andanaerobic 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 duringFenton’s Reagent treatment. A mass balance on carbon and nitrogen revealed that a significant fractionstill remained in the waste despite the additional treatment provided. Carbon was primarily convertedbiologically to CH4 and CO2 in the FBs or removed during treatment using Fenton’s Reagent. The nitrogenremoval occurred through leaching or biological conversion. These results show that under extensivetreatment 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 qualityand solid waste characteristics but not to the same extent as FB 1.
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