Abstract
Landfill leachate was treated using the upflow anaerobic sludge blanket (UASB) combined with anoxic/aerobic reactor (A/O) for shortcut biological nitrogen removal. The treatment performance and nitrous oxide (N2O) emission were studied under different salinity. When salinity increased from 10 to 35g/L, the removal efficiency of ammonium nitrogen and total nitrogen decreased from 99.3 to 83.9% and from 85.4 to 68.4%, respectively while the nitrite accumulation rate always remained high at more than 94.3%. The N2O conversion ratio increased by 14.7 times, from 0.3 to 4.7%. The concentration of biodegradable COD in influent of the A/O reactor increased with the increase of salinity, which lead to the decrease of dissolved oxygen and thus stimulated N2O emission remarkably during the aerobic zone. Meanwhile, the N2O emissions were likely to occur by a combination of pathways since the simultaneous nitritation and denitritation was occurred in aerobic zone. The increase of NH4+-N concentration, NO2−-N concentration and pH caused by high salinity also promoted the N2O emission. The population of Nitrosomonas europaea increased with salinity, which was important for N2O emission.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
