This research were performed to investigate the effect of practical use of solidified sludge to cover-material of landfill sites. To simulate artificial solid wastes decomposition and gas production at a full-scale landfill site, three small-scale lysimeter were filled with compost and feed-stuff of...
This research were performed to investigate the effect of practical use of solidified sludge to cover-material of landfill sites. To simulate artificial solid wastes decomposition and gas production at a full-scale landfill site, three small-scale lysimeter were filled with compost and feed-stuff of constant ratio of cover material and artificial wastes and operated at 38~40 degree centigrade under anaerobic condition with water added periodically for 191 days. Lysimeter L1 was composed of sand as cover material layer and compost/feed-stuff as artificial waste layer. Dehydrated sewage sludge and solidified sewage sludge were used as cover materials in L2 and L3 respectively. With a batch reactor (L3) using solidified sludge as cover material, the organic mass from lysimeter could be rapidly converted into methane and carbon dioxide due to slaked lime. The degradation of landfill-waste(artificial waste) in leachate was a three-phase degradation process within the lysimeter with anaerobic reactor, where the hydrolysis-acidification of organic wastes occurred mainly in the lysimeter, and methanogenesis occurred chiefly in the anaerobic batch reactor. Results of this research revealed that the methanogenic bacteria could be activated by alkalinity from slaked lime. After analysis of solid waste, the following elements were found in the buried waste:C at levels of Sand 0.04%, Compost 9.29% and Feed 42.39%, N at levels of Sand 0.45%, Compost 0.683% and Feed 3.10%, water content at levels of Sand 2.6%, Compost 44.9% and Feed 8.7%. The analysis of cover material from L1 to L3 were measured;C at levels of Sand 0.04%, Compost 29.32% and Feed 18.64%, N at levels of Sand 0.45%, Compost 4.84% and Feed 2.65%, water content at levels of Sand 2.6%, Compost 78.9% and Feed 47.3%. Of the gases analyzed; there was no CH4 found and CO2 was found at levels of 4.6~20.0%(L1), 6.60~45.0%(L2), 3.5~38.0%(L3) in the early time. The amount of CO2 and CH4 found in the mid and late time were measured at levels of 18.0~28.0%, 17.0~30.0%(L1), 32.0~48.0%, 19.5~51.0% (L2), 27.0~35.0%, 36.0%~46.0%(L3) In the result of physical properties of solid waste, the organic matters decreased continuously, because of the biological anaerobic decomposition. The reduction pattern can be divided into three parts; acclimation(part 1), growth(part 2) and stationary phase(part 3). The removal rate constant(k) for organic matter were calculated and compared by applying the parameters such as BOD/CODCr and time; 0.37, 0.39, 0.30(part 1~3 for L1), 0.35, 0.37, 0.23(part 1~3 for L2), 0.54, 0.16, 0.15(part 1~3 for L3). The result from experiment suggest that the quantity of gas extraction can be increased by using solidified sludge. Other benefits include maximization of landfill gas production for environmental aspects such as increased landfill capacity, improved stability for leachate treatment, reduction of post-closure cost and abatement of greenhouse gases.
This research were performed to investigate the effect of practical use of solidified sludge to cover-material of landfill sites. To simulate artificial solid wastes decomposition and gas production at a full-scale landfill site, three small-scale lysimeter were filled with compost and feed-stuff of constant ratio of cover material and artificial wastes and operated at 38~40 degree centigrade under anaerobic condition with water added periodically for 191 days. Lysimeter L1 was composed of sand as cover material layer and compost/feed-stuff as artificial waste layer. Dehydrated sewage sludge and solidified sewage sludge were used as cover materials in L2 and L3 respectively. With a batch reactor (L3) using solidified sludge as cover material, the organic mass from lysimeter could be rapidly converted into methane and carbon dioxide due to slaked lime. The degradation of landfill-waste(artificial waste) in leachate was a three-phase degradation process within the lysimeter with anaerobic reactor, where the hydrolysis-acidification of organic wastes occurred mainly in the lysimeter, and methanogenesis occurred chiefly in the anaerobic batch reactor. Results of this research revealed that the methanogenic bacteria could be activated by alkalinity from slaked lime. After analysis of solid waste, the following elements were found in the buried waste:C at levels of Sand 0.04%, Compost 9.29% and Feed 42.39%, N at levels of Sand 0.45%, Compost 0.683% and Feed 3.10%, water content at levels of Sand 2.6%, Compost 44.9% and Feed 8.7%. The analysis of cover material from L1 to L3 were measured;C at levels of Sand 0.04%, Compost 29.32% and Feed 18.64%, N at levels of Sand 0.45%, Compost 4.84% and Feed 2.65%, water content at levels of Sand 2.6%, Compost 78.9% and Feed 47.3%. Of the gases analyzed; there was no CH4 found and CO2 was found at levels of 4.6~20.0%(L1), 6.60~45.0%(L2), 3.5~38.0%(L3) in the early time. The amount of CO2 and CH4 found in the mid and late time were measured at levels of 18.0~28.0%, 17.0~30.0%(L1), 32.0~48.0%, 19.5~51.0% (L2), 27.0~35.0%, 36.0%~46.0%(L3) In the result of physical properties of solid waste, the organic matters decreased continuously, because of the biological anaerobic decomposition. The reduction pattern can be divided into three parts; acclimation(part 1), growth(part 2) and stationary phase(part 3). The removal rate constant(k) for organic matter were calculated and compared by applying the parameters such as BOD/CODCr and time; 0.37, 0.39, 0.30(part 1~3 for L1), 0.35, 0.37, 0.23(part 1~3 for L2), 0.54, 0.16, 0.15(part 1~3 for L3). The result from experiment suggest that the quantity of gas extraction can be increased by using solidified sludge. Other benefits include maximization of landfill gas production for environmental aspects such as increased landfill capacity, improved stability for leachate treatment, reduction of post-closure cost and abatement of greenhouse gases.
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