title: Advanced nitrogen removal from landfill leachate without addition of external carbon using a novel system coupling ASBR and modified SBR.
abstract: In order to achieve advanced nitrogen removal from landfill leachate without the addition of external carbon sources, a novel system coupling an anaerobic sequencing batch reactor (ASBR) and sequencing batch reactor (SBR) was proposed for the treatment of real landfill leachate with NH4+-N and chemical oxygen demand (COD) concentrations of 1100 mg/L and 6000 mg/L, respectively. ASBR could remove 80% of the influent COD under a volumetric loading rate of 5 kg COD/(m3d). Denitritation and simultaneous nitritation-denitritation were responsible for 50% of the TN removal in SBR under alternate anoxic/aerobic modes. Furthermore, advanced nitrogen removal was realized with a total inorganic nitrogen (TIN) removal efficiency of 99% at the expense of endogenous denitritation during a 26 h period, which led to effluent COD and TN values of 550-650 mg/L and 15-25 mgN/L, respectively. For the combined system, removal efficiencies of COD and total nitrogen (TN) were above 90% and 95%, respectively.
authors.affiliation: Engineering Research Center of Beijing, Beijing University of Technology, Beijing, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.forename: Shuying
authors.initials: S
authors.lastname: Wang
authors.forename: Rulong
authors.initials: R
authors.lastname: Zhu
authors.forename: Lei
authors.initials: L
authors.lastname: Miao
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Peng
mesh_terms: D000641:Ammonia / Q000302:isolation & purification; D000693:Anaerobiosis / Q000187:drug effects; D061249:Batch Cell Culture Techniques / Q000295:instrumentation*; D001673:Biodegradation, Environmental / Q000187:drug effects; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002244:Carbon / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D009566:Nitrates / Q000032:analysis; D009573:Nitrites / Q000032:analysis; D009584:Nitrogen / Q000302:isolation & purification*; D010100:Oxygen / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*
chemical_list: D009566:Nitrates; D009573:Nitrites; D014874:Water Pollutants, Chemical; D002244:Carbon; D000641:Ammonia; D009584:Nitrogen; D010100:Oxygen