A Life-Cycle Analysis of Alternatives for the Management ofWaste Hot-Mix Asphalt, Commercial Food Waste, and Construction and Demolition Waste.

construction and demolition waste;food waste;hot-mix asphalt;life cycle assessment;solid waste

Levis, James William ; Dr. Ranji S. Ranjithan, Committee Co-Chair,Dr. E. Downey Brill, Committee Member,Dr. Morton A. Barlaz, Committee Chair,Levis, James William ; Dr. Ranji S. Ranjithan ; Committee Co-Chair ; Dr. E. Downey Brill ; Committee Member ; Dr. Morton A. Barlaz ; Committee Chair

University:North Carolina State University

关键词: construction and demolition waste;    food waste;    hot-mix asphalt;    life cycle assessment;    solid waste;   

Others  :  https://repository.lib.ncsu.edu/bitstream/handle/1840.16/2701/etd.pdf?sequence=1&isAllowed=y

美国|英语

来源: null

【 摘 要 】

Effective management of commercially generated food waste presents an opportunity foravoided global warming potential, renewable energy production, and renewableagrochemical production. The vast majority of food waste is landfilled, but source separatedcollection of the organic fraction of municipal waste is becoming more common. Currently inthe US, food waste that is not buried in a landfill is aerobically composted and the endproduct has the potential to be used as a soil amendment that can replace mineral fertilizersor other agrochemicals. In Europe, anaerobic digestion (AD) of organic wastes is morecommon. AD facilities produce methane that can be used as an energy source. The residualfrom AD can also be used as a soil amendment similar to what is produced at compostingfacilities.An LCI was performed for food waste processed through several aerobic compostingsystems, an AD facility, and a landfill with and without energy recovery. The functional unitwas one ton of food waste plus 0.6 tons of yard waste. The yard waste was consideredbecause it is used as a bulking agent in food waste composting processes. The AD alternativewas superior in every category due to the efficient collection of the methane generated and itsconversion to energy. The two landfilling alternatives resulted in the highest GWP althoughthe landfill with energy recovery alternative had the second lowest emissions and energy use.The composting alternatives were superior relative to the landfilling without energy recoveryalternative.C&D waste is solid waste generated during the construction, renovation, or demolition ofbuildings and other structures. A life-cycle model was developed to evaluate two alternativesfor the management of C&D waste; (1) recycling (2) and landfill disposal. The C&D wasteLCI considered the recovery of ten materials present in a mixed C&D waste stream. All ofthe materials except for wallboard and miscellaneous materials are recovered for beneficialuse. All of the recovered materials except for wood are assumed to replace virgin materials.Wood is assumed to be burned in a co-fired coal plant to produce electricity. The results ofthis analysis indicate that recovering mixed C&D leads to significant reductions in emissions,energy use, and GWP when compared to landfill disposal of mixed C&D waste.