Fate Of Typical Emerging Contaminants In Municipal Solid Waste Landfills

If emerging contaminants into the environment, it might produce unpredictable hazards for organism and even the human. When nanomaterials、perfluorinated compounds、some unused or expired medications and personal care products ended their life, most of them will be transported to a landfill for disposal. In landfill disposal process, these emerging contaminants may be as leachate generation and release pollutants into the environment, polluting the water environment. However, the current study of emerging contaminants, most scholars focus on the aspects of rivers、life or production of sewage, but may be neglect of a huge new source of emerging contaminants. And we will generate enormous MSW in China, sanitary landfill is the main way for waste disposal, large amounts of leachate is produced per year. Therefore, study on emerging contaminants in solid waste is very necessary.In this research, the use of nano-Ag and nano-Ti O2, perfluorooctanoic acid(PFOA) and amoxicillin represent nanoparticles pollutants, perfluorinated compounds, pharmaceuticals and personal care products. The study set up garbage column simulated anaerobic landfill in the laboratory, to explore fate of these three typical emerging contaminants in landfill. And the effect of nano-Ti O2 degradation early leachate in different lighting conditions were investigated.The main conclusions are as follows:①In MSW landfills, there are emerging contaminants with the leachate seeping into the surrounding environment, and the content of emerging contaminants in solid waste is higher, the higher the exudation concentration of its.②Under the same recharge conditions, water quality parameters of leachate(COD, ammonia nitrogen, total nitrogen, p H, conductivity) changes in the same trend, the content of nano-Ag in waste affect the exudation concentration of nano-Ag. Under conditions contained equal amounts of nano-silver, water quality parameters(except p H) values of leachate by leachate recirculation are higher than leachate by distilled water recharge, and leachate recirculation can accelerate nano-Ag exuding from waste, but recharge distilled water for waste will promote the particle size of nano substances leaking increasing.③ The exudation concentration of nano-Ti O2 over time is decreasing, the concentration in early landfill is highest, the concentration in late landfill is lowest. The role of p H, conductivity and COD show inhibition for nano-Ti O2 leaking, the role of ammonia and TP showing promotion. The exudation concentration of PFOA over time is increasing, the concentration in early landfill is lowest, the concentration in late landfill is hightest. The role of conductivity and TN showing promotion for PFOA leaking, the role of ammonia showing inhibition. Amoxicillin due to adsorption and decomposition occurs in leachate, its concentration fall fast over time, the concentration in early landfill is highest. The role of p H, ammonia and TN showing inhibition for amoxicillin leaking, the role of conductivity, COD and TP showing promotion.④Under UV, natural light and dark conditions, the effect of nano-Ti O2 degradation early leachate over time is increasing; Under natural light and dark conditions, with increasing the addition amount of nano-Ti O2, the removal of organic pollutants increased, but under natural light, the amount added up to a certain amount(2.5g / L), removal is not likely to increase or even decline.