Aerobic Granular Slusge Simultaneous Nitrification And Denitrification Process N₂O Release

"Eutrophication" and the situation of water environment worldwide is becoming increasingly serious problem of water eutrophication have become increasingly prominent, by the people more and more attention. So how to improve nitrogen and phosphorus removal efficiency of conventional sewage treatment process, the development of efficient, energy saving, environmental protection, process, try not to cause secondary pollution of the new sewage treatment process, extensive research in the field of sewage nitrogen and phosphorus removal technology hot spots.Areas of research in the biological wastewater treatment, aerobic granular sludge, with many advantages such as good precipitation performance, high biomass, resistance to shock loading to meet the water quality ingredients unstable sewage from a number of emerging biological wastewater treatment technology stand out.Recent studies found that N2O production are accompanied by a variety of biological wastewater denitrification process. N2O is one of the most important greenhouse gas, caused by the greenhouse effect, has a strong warming potential310times that of CO2, CH4is23times. Nitrification and denitrification and partial nitrification and denitrification, simultaneous nitrification and denitrification and other biological wastewater treatment process that both N2O production in the above process.However, with a good nitrogen removal function of aerobic granular sludge systems, the use of simultaneous nitrification and denitrification of nitrogen and N2O Production in the denitrification process, the variation of their produce and release N2O will generate the amount of the impact of influent nitrogen concentration and sludge micro-expansion system for N2O production and changes will impact the research in this area is still rare.Artificial simulation of sewage in this topic as the processing object, the use of SBR under aerobic/anoxic operation mode,(1) aerobic granular sludge performance, stability and N2O emissions from the law;(2) influent ammonia impact aerobic granular sludge system of N2O production and variation;(3) expansion of micro-state aerobic granular sludge N2O generation and variation.The results showed that (1) with a good nitrogen removal function of simultaneous nitrification and denitrification of aerobic granular sludge, N2O production are in the process of aerobic aeration and anoxic mixing, but a lot of N2O in aerobic generated in the aeration process;(2) When the water of NH4+-N concentration from30mg/L, respectively suddenly increased to40mg/L,60mg/L and80mg/L of N2O production and the release of law is not significant of N2O production are3.019mg/m3,3.489mg/m3.3.271mg/m3, and3.490mg/m3, roughly the same:a week of ammonia removal, but the system for other operating conditions unchanged. the impact of a significant reduction in the system ammonia influent ammonia the removal efficiency of ammonia removal efficiency from80.04%to61.40%,39.65%and31.02%;(3) in a stable influent ammonium concentration of30mg/L case, the micro-expansion of the sludge, N2O production did not occur1.88times the expansion of sludge; the impact of concentration in the influent ammonia of40mg/L, and micro-expansion N2O production of sludge is2.3times the expansion of sludge.